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|
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Author: kenton@google.com (Kenton Varda)
// Based on original Protocol Buffers design by
// Sanjay Ghemawat, Jeff Dean, and others.
#include <google/protobuf/compiler/cpp/cpp_file.h>
#include <google/protobuf/compiler/cpp/cpp_enum.h>
#include <google/protobuf/compiler/cpp/cpp_service.h>
#include <google/protobuf/compiler/cpp/cpp_extension.h>
#include <google/protobuf/compiler/cpp/cpp_helpers.h>
#include <google/protobuf/compiler/cpp/cpp_message.h>
#include <google/protobuf/compiler/cpp/cpp_field.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/stubs/strutil.h>
namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {
// ===================================================================
FileGenerator::FileGenerator(const FileDescriptor* file,
const string& dllexport_decl)
: file_(file),
message_generators_(
new scoped_ptr<MessageGenerator>[file->message_type_count()]),
enum_generators_(
new scoped_ptr<EnumGenerator>[file->enum_type_count()]),
service_generators_(
new scoped_ptr<ServiceGenerator>[file->service_count()]),
extension_generators_(
new scoped_ptr<ExtensionGenerator>[file->extension_count()]),
dllexport_decl_(dllexport_decl) {
for (int i = 0; i < file->message_type_count(); i++) {
message_generators_[i].reset(
new MessageGenerator(file->message_type(i), dllexport_decl));
}
for (int i = 0; i < file->enum_type_count(); i++) {
enum_generators_[i].reset(
new EnumGenerator(file->enum_type(i), dllexport_decl));
}
for (int i = 0; i < file->service_count(); i++) {
service_generators_[i].reset(
new ServiceGenerator(file->service(i), dllexport_decl));
}
for (int i = 0; i < file->extension_count(); i++) {
extension_generators_[i].reset(
new ExtensionGenerator(file->extension(i), dllexport_decl));
}
SplitStringUsing(file_->package(), ".", &package_parts_);
}
FileGenerator::~FileGenerator() {}
void FileGenerator::GenerateHeader(io::Printer* printer) {
string filename_identifier = FilenameIdentifier(file_->name());
// Generate top of header.
printer->Print(
"// Generated by the protocol buffer compiler. DO NOT EDIT!\n"
"// source: $filename$\n"
"\n"
"#ifndef PROTOBUF_$filename_identifier$__INCLUDED\n"
"#define PROTOBUF_$filename_identifier$__INCLUDED\n"
"\n"
"#include <string>\n"
"\n",
"filename", file_->name(),
"filename_identifier", filename_identifier);
printer->Print(
"#include <google/protobuf/stubs/common.h>\n"
"\n");
// Verify the protobuf library header version is compatible with the protoc
// version before going any further.
printer->Print(
"#if GOOGLE_PROTOBUF_VERSION < $min_header_version$\n"
"#error This file was generated by a newer version of protoc which is\n"
"#error incompatible with your Protocol Buffer headers. Please update\n"
"#error your headers.\n"
"#endif\n"
"#if $protoc_version$ < GOOGLE_PROTOBUF_MIN_PROTOC_VERSION\n"
"#error This file was generated by an older version of protoc which is\n"
"#error incompatible with your Protocol Buffer headers. Please\n"
"#error regenerate this file with a newer version of protoc.\n"
"#endif\n"
"\n",
"min_header_version",
SimpleItoa(protobuf::internal::kMinHeaderVersionForProtoc),
"protoc_version", SimpleItoa(GOOGLE_PROTOBUF_VERSION));
// OK, it's now safe to #include other files.
printer->Print(
"#include <google/protobuf/generated_message_util.h>\n"
"#include <google/protobuf/repeated_field.h>\n"
"#include <google/protobuf/extension_set.h>\n");
if (HasDescriptorMethods(file_)) {
printer->Print(
"#include <google/protobuf/generated_message_reflection.h>\n");
}
if (HasGenericServices(file_)) {
printer->Print(
"#include <google/protobuf/service.h>\n");
}
for (int i = 0; i < file_->dependency_count(); i++) {
printer->Print(
"#include \"$dependency$.pb.h\"\n",
"dependency", StripProto(file_->dependency(i)->name()));
}
printer->Print(
"// @@protoc_insertion_point(includes)\n");
// Open namespace.
GenerateNamespaceOpeners(printer);
// Forward-declare the AddDescriptors, AssignDescriptors, and ShutdownFile
// functions, so that we can declare them to be friends of each class.
printer->Print(
"\n"
"// Internal implementation detail -- do not call these.\n"
"void $dllexport_decl$ $adddescriptorsname$();\n",
"adddescriptorsname", GlobalAddDescriptorsName(file_->name()),
"dllexport_decl", dllexport_decl_);
printer->Print(
// Note that we don't put dllexport_decl on these because they are only
// called by the .pb.cc file in which they are defined.
"void $assigndescriptorsname$();\n"
"void $shutdownfilename$();\n"
"\n",
"assigndescriptorsname", GlobalAssignDescriptorsName(file_->name()),
"shutdownfilename", GlobalShutdownFileName(file_->name()));
// Generate forward declarations of classes.
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateForwardDeclaration(printer);
}
printer->Print("\n");
// Generate enum definitions.
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateEnumDefinitions(printer);
}
for (int i = 0; i < file_->enum_type_count(); i++) {
enum_generators_[i]->GenerateDefinition(printer);
}
printer->Print(kThickSeparator);
printer->Print("\n");
// Generate class definitions.
for (int i = 0; i < file_->message_type_count(); i++) {
if (i > 0) {
printer->Print("\n");
printer->Print(kThinSeparator);
printer->Print("\n");
}
message_generators_[i]->GenerateClassDefinition(printer);
}
printer->Print("\n");
printer->Print(kThickSeparator);
printer->Print("\n");
if (HasGenericServices(file_)) {
// Generate service definitions.
for (int i = 0; i < file_->service_count(); i++) {
if (i > 0) {
printer->Print("\n");
printer->Print(kThinSeparator);
printer->Print("\n");
}
service_generators_[i]->GenerateDeclarations(printer);
}
printer->Print("\n");
printer->Print(kThickSeparator);
printer->Print("\n");
}
// Declare extension identifiers.
for (int i = 0; i < file_->extension_count(); i++) {
extension_generators_[i]->GenerateDeclaration(printer);
}
printer->Print("\n");
printer->Print(kThickSeparator);
printer->Print("\n");
// Generate class inline methods.
for (int i = 0; i < file_->message_type_count(); i++) {
if (i > 0) {
printer->Print(kThinSeparator);
printer->Print("\n");
}
message_generators_[i]->GenerateInlineMethods(printer);
}
printer->Print(
"\n"
"// @@protoc_insertion_point(namespace_scope)\n");
// Close up namespace.
GenerateNamespaceClosers(printer);
// Emit GetEnumDescriptor specializations into google::protobuf namespace:
if (HasDescriptorMethods(file_)) {
// The SWIG conditional is to avoid a null-pointer dereference
// (bug 1984964) in swig-1.3.21 resulting from the following syntax:
// namespace X { void Y<Z::W>(); }
// which appears in GetEnumDescriptor() specializations.
printer->Print(
"\n"
"#ifndef SWIG\n"
"namespace google {\nnamespace protobuf {\n"
"\n");
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateGetEnumDescriptorSpecializations(printer);
}
for (int i = 0; i < file_->enum_type_count(); i++) {
enum_generators_[i]->GenerateGetEnumDescriptorSpecializations(printer);
}
printer->Print(
"\n"
"} // namespace google\n} // namespace protobuf\n"
"#endif // SWIG\n");
}
printer->Print(
"\n"
"// @@protoc_insertion_point(global_scope)\n"
"\n");
printer->Print(
"#endif // PROTOBUF_$filename_identifier$__INCLUDED\n",
"filename_identifier", filename_identifier);
}
void FileGenerator::GenerateSource(io::Printer* printer) {
printer->Print(
"// Generated by the protocol buffer compiler. DO NOT EDIT!\n"
"\n"
// The generated code calls accessors that might be deprecated. We don't
// want the compiler to warn in generated code.
"#define INTERNAL_SUPPRESS_PROTOBUF_FIELD_DEPRECATION\n"
"#include \"$basename$.pb.h\"\n"
"\n"
"#include <algorithm>\n" // for swap()
"\n"
"#include <google/protobuf/stubs/once.h>\n"
"#include <google/protobuf/io/coded_stream.h>\n"
"#include <google/protobuf/wire_format_lite_inl.h>\n",
"basename", StripProto(file_->name()));
if (HasDescriptorMethods(file_)) {
printer->Print(
"#include <google/protobuf/descriptor.h>\n"
"#include <google/protobuf/reflection_ops.h>\n"
"#include <google/protobuf/wire_format.h>\n");
}
printer->Print(
"// @@protoc_insertion_point(includes)\n");
GenerateNamespaceOpeners(printer);
if (HasDescriptorMethods(file_)) {
printer->Print(
"\n"
"namespace {\n"
"\n");
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateDescriptorDeclarations(printer);
}
for (int i = 0; i < file_->enum_type_count(); i++) {
printer->Print(
"const ::google::protobuf::EnumDescriptor* $name$_descriptor_ = NULL;\n",
"name", ClassName(file_->enum_type(i), false));
}
if (HasGenericServices(file_)) {
for (int i = 0; i < file_->service_count(); i++) {
printer->Print(
"const ::google::protobuf::ServiceDescriptor* $name$_descriptor_ = NULL;\n",
"name", file_->service(i)->name());
}
}
printer->Print(
"\n"
"} // namespace\n"
"\n");
}
// Define our externally-visible BuildDescriptors() function. (For the lite
// library, all this does is initialize default instances.)
GenerateBuildDescriptors(printer);
// Generate enums.
for (int i = 0; i < file_->enum_type_count(); i++) {
enum_generators_[i]->GenerateMethods(printer);
}
// Generate classes.
for (int i = 0; i < file_->message_type_count(); i++) {
printer->Print("\n");
printer->Print(kThickSeparator);
printer->Print("\n");
message_generators_[i]->GenerateClassMethods(printer);
}
if (HasGenericServices(file_)) {
// Generate services.
for (int i = 0; i < file_->service_count(); i++) {
if (i == 0) printer->Print("\n");
printer->Print(kThickSeparator);
printer->Print("\n");
service_generators_[i]->GenerateImplementation(printer);
}
}
// Define extensions.
for (int i = 0; i < file_->extension_count(); i++) {
extension_generators_[i]->GenerateDefinition(printer);
}
printer->Print(
"\n"
"// @@protoc_insertion_point(namespace_scope)\n");
GenerateNamespaceClosers(printer);
printer->Print(
"\n"
"// @@protoc_insertion_point(global_scope)\n");
}
void FileGenerator::GenerateBuildDescriptors(io::Printer* printer) {
// AddDescriptors() is a file-level procedure which adds the encoded
// FileDescriptorProto for this .proto file to the global DescriptorPool for
// generated files (DescriptorPool::generated_pool()). It either runs at
// static initialization time (by default) or when default_instance() is
// called for the first time (in LITE_RUNTIME mode with
// GOOGLE_PROTOBUF_NO_STATIC_INITIALIZER flag enabled). This procedure also
// constructs default instances and registers extensions.
//
// Its sibling, AssignDescriptors(), actually pulls the compiled
// FileDescriptor from the DescriptorPool and uses it to populate all of
// the global variables which store pointers to the descriptor objects.
// It also constructs the reflection objects. It is called the first time
// anyone calls descriptor() or GetReflection() on one of the types defined
// in the file.
// In optimize_for = LITE_RUNTIME mode, we don't generate AssignDescriptors()
// and we only use AddDescriptors() to allocate default instances.
if (HasDescriptorMethods(file_)) {
printer->Print(
"\n"
"void $assigndescriptorsname$() {\n",
"assigndescriptorsname", GlobalAssignDescriptorsName(file_->name()));
printer->Indent();
// Make sure the file has found its way into the pool. If a descriptor
// is requested *during* static init then AddDescriptors() may not have
// been called yet, so we call it manually. Note that it's fine if
// AddDescriptors() is called multiple times.
printer->Print(
"$adddescriptorsname$();\n",
"adddescriptorsname", GlobalAddDescriptorsName(file_->name()));
// Get the file's descriptor from the pool.
printer->Print(
"const ::google::protobuf::FileDescriptor* file =\n"
" ::google::protobuf::DescriptorPool::generated_pool()->FindFileByName(\n"
" \"$filename$\");\n"
// Note that this GOOGLE_CHECK is necessary to prevent a warning about "file"
// being unused when compiling an empty .proto file.
"GOOGLE_CHECK(file != NULL);\n",
"filename", file_->name());
// Go through all the stuff defined in this file and generated code to
// assign the global descriptor pointers based on the file descriptor.
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateDescriptorInitializer(printer, i);
}
for (int i = 0; i < file_->enum_type_count(); i++) {
enum_generators_[i]->GenerateDescriptorInitializer(printer, i);
}
if (HasGenericServices(file_)) {
for (int i = 0; i < file_->service_count(); i++) {
service_generators_[i]->GenerateDescriptorInitializer(printer, i);
}
}
printer->Outdent();
printer->Print(
"}\n"
"\n");
// ---------------------------------------------------------------
// protobuf_AssignDescriptorsOnce(): The first time it is called, calls
// AssignDescriptors(). All later times, waits for the first call to
// complete and then returns.
printer->Print(
"namespace {\n"
"\n"
"GOOGLE_PROTOBUF_DECLARE_ONCE(protobuf_AssignDescriptors_once_);\n"
"inline void protobuf_AssignDescriptorsOnce() {\n"
" ::google::protobuf::GoogleOnceInit(&protobuf_AssignDescriptors_once_,\n"
" &$assigndescriptorsname$);\n"
"}\n"
"\n",
"assigndescriptorsname", GlobalAssignDescriptorsName(file_->name()));
// protobuf_RegisterTypes(): Calls
// MessageFactory::InternalRegisterGeneratedType() for each message type.
printer->Print(
"void protobuf_RegisterTypes(const ::std::string&) {\n"
" protobuf_AssignDescriptorsOnce();\n");
printer->Indent();
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateTypeRegistrations(printer);
}
printer->Outdent();
printer->Print(
"}\n"
"\n"
"} // namespace\n");
}
// -----------------------------------------------------------------
// ShutdownFile(): Deletes descriptors, default instances, etc. on shutdown.
printer->Print(
"\n"
"void $shutdownfilename$() {\n",
"shutdownfilename", GlobalShutdownFileName(file_->name()));
printer->Indent();
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateShutdownCode(printer);
}
printer->Outdent();
printer->Print(
"}\n\n");
// -----------------------------------------------------------------
// Now generate the AddDescriptors() function.
PrintHandlingOptionalStaticInitializers(
file_, printer,
// With static initializers.
// Note that we don't need any special synchronization in the following code
// because it is called at static init time before any threads exist.
"void $adddescriptorsname$() {\n"
" static bool already_here = false;\n"
" if (already_here) return;\n"
" already_here = true;\n"
" GOOGLE_PROTOBUF_VERIFY_VERSION;\n",
// Without.
"void $adddescriptorsname$_impl() {\n"
" GOOGLE_PROTOBUF_VERIFY_VERSION;\n",
// Vars.
"adddescriptorsname", GlobalAddDescriptorsName(file_->name()));
printer->Indent();
// Call the AddDescriptors() methods for all of our dependencies, to make
// sure they get added first.
for (int i = 0; i < file_->dependency_count(); i++) {
const FileDescriptor* dependency = file_->dependency(i);
// Print the namespace prefix for the dependency.
vector<string> dependency_package_parts;
SplitStringUsing(dependency->package(), ".", &dependency_package_parts);
printer->Print("::");
for (int i = 0; i < dependency_package_parts.size(); i++) {
printer->Print("$name$::",
"name", dependency_package_parts[i]);
}
// Call its AddDescriptors function.
printer->Print(
"$name$();\n",
"name", GlobalAddDescriptorsName(dependency->name()));
}
if (HasDescriptorMethods(file_)) {
// Embed the descriptor. We simply serialize the entire FileDescriptorProto
// and embed it as a string literal, which is parsed and built into real
// descriptors at initialization time.
FileDescriptorProto file_proto;
file_->CopyTo(&file_proto);
string file_data;
file_proto.SerializeToString(&file_data);
printer->Print(
"::google::protobuf::DescriptorPool::InternalAddGeneratedFile(");
// Only write 40 bytes per line.
static const int kBytesPerLine = 40;
for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
printer->Print("\n \"$data$\"",
"data", EscapeTrigraphs(CEscape(file_data.substr(i, kBytesPerLine))));
}
printer->Print(
", $size$);\n",
"size", SimpleItoa(file_data.size()));
// Call MessageFactory::InternalRegisterGeneratedFile().
printer->Print(
"::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(\n"
" \"$filename$\", &protobuf_RegisterTypes);\n",
"filename", file_->name());
}
// Allocate and initialize default instances. This can't be done lazily
// since default instances are returned by simple accessors and are used with
// extensions. Speaking of which, we also register extensions at this time.
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateDefaultInstanceAllocator(printer);
}
for (int i = 0; i < file_->extension_count(); i++) {
extension_generators_[i]->GenerateRegistration(printer);
}
for (int i = 0; i < file_->message_type_count(); i++) {
message_generators_[i]->GenerateDefaultInstanceInitializer(printer);
}
printer->Print(
"::google::protobuf::internal::OnShutdown(&$shutdownfilename$);\n",
"shutdownfilename", GlobalShutdownFileName(file_->name()));
printer->Outdent();
printer->Print(
"}\n"
"\n");
PrintHandlingOptionalStaticInitializers(
file_, printer,
// With static initializers.
"// Force AddDescriptors() to be called at static initialization time.\n"
"struct StaticDescriptorInitializer_$filename$ {\n"
" StaticDescriptorInitializer_$filename$() {\n"
" $adddescriptorsname$();\n"
" }\n"
"} static_descriptor_initializer_$filename$_;\n",
// Without.
"GOOGLE_PROTOBUF_DECLARE_ONCE($adddescriptorsname$_once_);\n"
"void $adddescriptorsname$() {\n"
" ::google::protobuf::GoogleOnceInit(&$adddescriptorsname$_once_,\n"
" &$adddescriptorsname$_impl);\n"
"}\n",
// Vars.
"adddescriptorsname", GlobalAddDescriptorsName(file_->name()),
"filename", FilenameIdentifier(file_->name()));
}
void FileGenerator::GenerateNamespaceOpeners(io::Printer* printer) {
if (package_parts_.size() > 0) printer->Print("\n");
for (int i = 0; i < package_parts_.size(); i++) {
printer->Print("namespace $part$ {\n",
"part", package_parts_[i]);
}
}
void FileGenerator::GenerateNamespaceClosers(io::Printer* printer) {
if (package_parts_.size() > 0) printer->Print("\n");
for (int i = package_parts_.size() - 1; i >= 0; i--) {
printer->Print("} // namespace $part$\n",
"part", package_parts_[i]);
}
}
} // namespace cpp
} // namespace compiler
} // namespace protobuf
} // namespace google
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