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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 <algorithm>
#include <google/protobuf/stubs/hash.h>
#include <google/protobuf/compiler/cpp/cpp_message.h>
#include <google/protobuf/compiler/cpp/cpp_enum.h>
#include <google/protobuf/compiler/cpp/cpp_extension.h>
#include <google/protobuf/compiler/cpp/cpp_helpers.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/wire_format_inl.h>
#include <google/protobuf/descriptor.pb.h>
namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {
using internal::WireFormat;
namespace {
void PrintFieldComment(io::Printer* printer, const FieldDescriptor* field) {
// Print the field's proto-syntax definition as a comment. We don't want to
// print group bodies so we cut off after the first line.
string def = field->DebugString();
printer->Print("// $def$\n",
"def", def.substr(0, def.find_first_of('\n')));
}
struct FieldOrderingByNumber {
inline bool operator()(const FieldDescriptor* a,
const FieldDescriptor* b) const {
return a->number() < b->number();
}
};
const char* kWireTypeNames[] = {
"VARINT",
"FIXED64",
"LENGTH_DELIMITED",
"START_GROUP",
"END_GROUP",
"FIXED32",
};
// Sort the fields of the given Descriptor by number into a new[]'d array
// and return it.
const FieldDescriptor** SortFieldsByNumber(const Descriptor* descriptor) {
const FieldDescriptor** fields =
new const FieldDescriptor*[descriptor->field_count()];
for (int i = 0; i < descriptor->field_count(); i++) {
fields[i] = descriptor->field(i);
}
sort(fields, fields + descriptor->field_count(),
FieldOrderingByNumber());
return fields;
}
// Functor for sorting extension ranges by their "start" field number.
struct ExtensionRangeSorter {
bool operator()(const Descriptor::ExtensionRange* left,
const Descriptor::ExtensionRange* right) const {
return left->start < right->start;
}
};
// Returns true if the message type has any required fields. If it doesn't,
// we can optimize out calls to its IsInitialized() method.
//
// already_seen is used to avoid checking the same type multiple times
// (and also to protect against recursion).
static bool HasRequiredFields(
const Descriptor* type,
hash_set<const Descriptor*>* already_seen) {
if (already_seen->count(type) > 0) {
// Since the first occurrence of a required field causes the whole
// function to return true, we can assume that if the type is already
// in the cache it didn't have any required fields.
return false;
}
already_seen->insert(type);
// If the type has extensions, an extension with message type could contain
// required fields, so we have to be conservative and assume such an
// extension exists.
if (type->extension_range_count() > 0) return true;
for (int i = 0; i < type->field_count(); i++) {
const FieldDescriptor* field = type->field(i);
if (field->is_required()) {
return true;
}
if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
if (HasRequiredFields(field->message_type(), already_seen)) {
return true;
}
}
}
return false;
}
static bool HasRequiredFields(const Descriptor* type) {
hash_set<const Descriptor*> already_seen;
return HasRequiredFields(type, &already_seen);
}
}
// ===================================================================
MessageGenerator::MessageGenerator(const Descriptor* descriptor,
const string& dllexport_decl)
: descriptor_(descriptor),
classname_(ClassName(descriptor, false)),
dllexport_decl_(dllexport_decl),
field_generators_(descriptor),
nested_generators_(new scoped_ptr<MessageGenerator>[
descriptor->nested_type_count()]),
enum_generators_(new scoped_ptr<EnumGenerator>[
descriptor->enum_type_count()]),
extension_generators_(new scoped_ptr<ExtensionGenerator>[
descriptor->extension_count()]) {
for (int i = 0; i < descriptor->nested_type_count(); i++) {
nested_generators_[i].reset(
new MessageGenerator(descriptor->nested_type(i), dllexport_decl));
}
for (int i = 0; i < descriptor->enum_type_count(); i++) {
enum_generators_[i].reset(
new EnumGenerator(descriptor->enum_type(i), dllexport_decl));
}
for (int i = 0; i < descriptor->extension_count(); i++) {
extension_generators_[i].reset(
new ExtensionGenerator(descriptor->extension(i), dllexport_decl));
}
}
MessageGenerator::~MessageGenerator() {}
void MessageGenerator::
GenerateForwardDeclaration(io::Printer* printer) {
printer->Print("class $classname$;\n",
"classname", classname_);
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateForwardDeclaration(printer);
}
}
void MessageGenerator::
GenerateEnumDefinitions(io::Printer* printer) {
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateEnumDefinitions(printer);
}
for (int i = 0; i < descriptor_->enum_type_count(); i++) {
enum_generators_[i]->GenerateDefinition(printer);
}
}
void MessageGenerator::
GenerateFieldAccessorDeclarations(io::Printer* printer) {
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
PrintFieldComment(printer, field);
map<string, string> vars;
vars["name"] = FieldName(field);
vars["constant_name"] = FieldConstantName(field);
vars["number"] = SimpleItoa(field->number());
if (field->is_repeated()) {
printer->Print(vars, "inline int $name$_size() const;\n");
} else {
printer->Print(vars, "inline bool has_$name$() const;\n");
}
printer->Print(vars, "inline void clear_$name$();\n");
printer->Print(vars, "static const int $constant_name$ = $number$;\n");
// Generate type-specific accessor declarations.
field_generators_.get(field).GenerateAccessorDeclarations(printer);
printer->Print("\n");
}
if (descriptor_->extension_range_count() > 0) {
// Generate accessors for extensions. We just call a macro located in
// extension_set.h since the accessors about 80 lines of static code.
printer->Print(
"GOOGLE_PROTOBUF_EXTENSION_ACCESSORS($classname$)\n",
"classname", classname_);
}
}
void MessageGenerator::
GenerateFieldAccessorDefinitions(io::Printer* printer) {
printer->Print("// $classname$\n\n", "classname", classname_);
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
PrintFieldComment(printer, field);
map<string, string> vars;
vars["name"] = FieldName(field);
vars["index"] = SimpleItoa(field->index());
vars["classname"] = classname_;
// Generate has_$name$() or $name$_size().
if (field->is_repeated()) {
printer->Print(vars,
"inline int $classname$::$name$_size() const {\n"
" return $name$_.size();\n"
"}\n");
} else {
// Singular field.
printer->Print(vars,
"inline bool $classname$::has_$name$() const {\n"
" return _has_bit($index$);\n"
"}\n");
}
// Generate clear_$name$()
printer->Print(vars,
"inline void $classname$::clear_$name$() {\n");
printer->Indent();
field_generators_.get(field).GenerateClearingCode(printer);
printer->Outdent();
if (!field->is_repeated()) {
printer->Print(vars, " _clear_bit($index$);\n");
}
printer->Print("}\n");
// Generate type-specific accessors.
field_generators_.get(field).GenerateInlineAccessorDefinitions(printer);
printer->Print("\n");
}
}
void MessageGenerator::
GenerateClassDefinition(io::Printer* printer) {
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateClassDefinition(printer);
printer->Print("\n");
printer->Print(kThinSeparator);
printer->Print("\n");
}
map<string, string> vars;
vars["classname"] = classname_;
vars["field_count"] = SimpleItoa(descriptor_->field_count());
if (dllexport_decl_.empty()) {
vars["dllexport"] = "";
} else {
vars["dllexport"] = dllexport_decl_ + " ";
}
printer->Print(vars,
"class $dllexport$$classname$ : public ::google::protobuf::Message {\n"
" public:\n");
printer->Indent();
printer->Print(vars,
"$classname$();\n"
"virtual ~$classname$();\n"
"\n"
"$classname$(const $classname$& from);\n"
"\n"
"inline $classname$& operator=(const $classname$& from) {\n"
" CopyFrom(from);\n"
" return *this;\n"
"}\n"
"\n"
"inline const ::google::protobuf::UnknownFieldSet& unknown_fields() const {\n"
" return _unknown_fields_;\n"
"}\n"
"\n"
"inline ::google::protobuf::UnknownFieldSet* mutable_unknown_fields() {\n"
" return &_unknown_fields_;\n"
"}\n"
"\n"
"static const ::google::protobuf::Descriptor* descriptor();\n"
"static const $classname$& default_instance();\n"
"void Swap($classname$* other);\n"
"\n"
"// implements Message ----------------------------------------------\n"
"\n"
"$classname$* New() const;\n");
if (descriptor_->file()->options().optimize_for() == FileOptions::SPEED) {
printer->Print(vars,
"void CopyFrom(const ::google::protobuf::Message& from);\n"
"void MergeFrom(const ::google::protobuf::Message& from);\n"
"void CopyFrom(const $classname$& from);\n"
"void MergeFrom(const $classname$& from);\n"
"void Clear();\n"
"bool IsInitialized() const;\n");
if (!descriptor_->options().message_set_wire_format()) {
// For message_set_wire_format, we don't generate parsing or
// serialization code even if optimize_for = SPEED, since MessageSet
// encoding is somewhat more complicated than normal extension encoding
// and we'd like to avoid having to implement it in multiple places.
// WireFormat's implementation is probably good enough.
printer->Print(vars,
"\n"
"int ByteSize() const;\n"
"bool MergePartialFromCodedStream(\n"
" ::google::protobuf::io::CodedInputStream* input);\n"
"void SerializeWithCachedSizes(\n"
" ::google::protobuf::io::CodedOutputStream* output) const;\n"
"::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output) const;\n");
}
}
printer->Print(vars,
"int GetCachedSize() const { return _cached_size_; }\n"
"private:\n"
"void SharedCtor();\n"
"void SharedDtor();\n"
"void SetCachedSize(int size) const { _cached_size_ = size; }\n"
"public:\n"
"\n"
"const ::google::protobuf::Descriptor* GetDescriptor() const;\n"
"const ::google::protobuf::Reflection* GetReflection() const;\n"
"\n"
"// nested types ----------------------------------------------------\n"
"\n");
// Import all nested message classes into this class's scope with typedefs.
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
const Descriptor* nested_type = descriptor_->nested_type(i);
printer->Print("typedef $nested_full_name$ $nested_name$;\n",
"nested_name", nested_type->name(),
"nested_full_name", ClassName(nested_type, false));
}
if (descriptor_->nested_type_count() > 0) {
printer->Print("\n");
}
// Import all nested enums and their values into this class's scope with
// typedefs and constants.
for (int i = 0; i < descriptor_->enum_type_count(); i++) {
enum_generators_[i]->GenerateSymbolImports(printer);
printer->Print("\n");
}
printer->Print(
"// accessors -------------------------------------------------------\n"
"\n");
// Generate accessor methods for all fields.
GenerateFieldAccessorDeclarations(printer);
// Declare extension identifiers.
for (int i = 0; i < descriptor_->extension_count(); i++) {
extension_generators_[i]->GenerateDeclaration(printer);
}
// Generate private members for fields.
printer->Outdent();
printer->Print(" private:\n");
printer->Indent();
if (descriptor_->extension_range_count() > 0) {
printer->Print(
"::google::protobuf::internal::ExtensionSet _extensions_;\n");
}
// TODO(kenton): Make _cached_size_ an atomic<int> when C++ supports it.
printer->Print(
"::google::protobuf::UnknownFieldSet _unknown_fields_;\n"
"mutable int _cached_size_;\n"
"\n");
for (int i = 0; i < descriptor_->field_count(); i++) {
field_generators_.get(descriptor_->field(i))
.GeneratePrivateMembers(printer);
}
// Declare AddDescriptors() and BuildDescriptors() as friends so that they
// can assign private static variables like default_instance_ and reflection_.
printer->Print(
"friend void $dllexport_decl$ $adddescriptorsname$();\n",
"dllexport_decl", dllexport_decl_,
"adddescriptorsname",
GlobalAddDescriptorsName(descriptor_->file()->name()));
printer->Print(
"friend void $assigndescriptorsname$();\n",
"assigndescriptorsname",
GlobalAssignDescriptorsName(descriptor_->file()->name()));
// Generate offsets and _has_bits_ boilerplate.
if (descriptor_->field_count() > 0) {
printer->Print(vars,
"::google::protobuf::uint32 _has_bits_[($field_count$ + 31) / 32];\n");
} else {
// Zero-size arrays aren't technically allowed, and MSVC in particular
// doesn't like them. We still need to declare these arrays to make
// other code compile. Since this is an uncommon case, we'll just declare
// them with size 1 and waste some space. Oh well.
printer->Print(
"::google::protobuf::uint32 _has_bits_[1];\n");
}
printer->Print(
"\n"
"// WHY DOES & HAVE LOWER PRECEDENCE THAN != !?\n"
"inline bool _has_bit(int index) const {\n"
" return (_has_bits_[index / 32] & (1u << (index % 32))) != 0;\n"
"}\n"
"inline void _set_bit(int index) {\n"
" _has_bits_[index / 32] |= (1u << (index % 32));\n"
"}\n"
"inline void _clear_bit(int index) {\n"
" _has_bits_[index / 32] &= ~(1u << (index % 32));\n"
"}\n"
"\n"
"void InitAsDefaultInstance();\n"
"static $classname$* default_instance_;\n",
"classname", classname_);
printer->Outdent();
printer->Print(vars, "};");
}
void MessageGenerator::
GenerateInlineMethods(io::Printer* printer) {
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateInlineMethods(printer);
printer->Print(kThinSeparator);
printer->Print("\n");
}
GenerateFieldAccessorDefinitions(printer);
}
void MessageGenerator::
GenerateDescriptorDeclarations(io::Printer* printer) {
printer->Print(
"const ::google::protobuf::Descriptor* $name$_descriptor_ = NULL;\n"
"const ::google::protobuf::internal::GeneratedMessageReflection*\n"
" $name$_reflection_ = NULL;\n",
"name", classname_);
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateDescriptorDeclarations(printer);
}
for (int i = 0; i < descriptor_->enum_type_count(); i++) {
printer->Print(
"const ::google::protobuf::EnumDescriptor* $name$_descriptor_ = NULL;\n",
"name", ClassName(descriptor_->enum_type(i), false));
}
}
void MessageGenerator::
GenerateDescriptorInitializer(io::Printer* printer, int index) {
// TODO(kenton): Passing the index to this method is redundant; just use
// descriptor_->index() instead.
map<string, string> vars;
vars["classname"] = classname_;
vars["index"] = SimpleItoa(index);
// Obtain the descriptor from the parent's descriptor.
if (descriptor_->containing_type() == NULL) {
printer->Print(vars,
"$classname$_descriptor_ = file->message_type($index$);\n");
} else {
vars["parent"] = ClassName(descriptor_->containing_type(), false);
printer->Print(vars,
"$classname$_descriptor_ = "
"$parent$_descriptor_->nested_type($index$);\n");
}
// Generate the offsets.
GenerateOffsets(printer);
// Construct the reflection object.
printer->Print(vars,
"$classname$_reflection_ =\n"
" new ::google::protobuf::internal::GeneratedMessageReflection(\n"
" $classname$_descriptor_,\n"
" $classname$::default_instance_,\n"
" $classname$_offsets_,\n"
" GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, _has_bits_[0]),\n"
" GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET("
"$classname$, _unknown_fields_),\n");
if (descriptor_->extension_range_count() > 0) {
printer->Print(vars,
" GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET("
"$classname$, _extensions_),\n");
} else {
// No extensions.
printer->Print(vars,
" -1,\n");
}
printer->Print(vars,
" ::google::protobuf::DescriptorPool::generated_pool(),\n"
" ::google::protobuf::MessageFactory::generated_factory(),\n"
" sizeof($classname$));\n");
// Handle nested types.
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateDescriptorInitializer(printer, i);
}
for (int i = 0; i < descriptor_->enum_type_count(); i++) {
enum_generators_[i]->GenerateDescriptorInitializer(printer, i);
}
}
void MessageGenerator::
GenerateTypeRegistrations(io::Printer* printer) {
// Register this message type with the message factory.
printer->Print(
"::google::protobuf::MessageFactory::InternalRegisterGeneratedMessage(\n"
" $classname$_descriptor_, &$classname$::default_instance());\n",
"classname", classname_);
// Handle nested types.
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateTypeRegistrations(printer);
}
}
void MessageGenerator::
GenerateDefaultInstanceAllocator(io::Printer* printer) {
// Construct the default instance. We can't call InitAsDefaultInstance() yet
// because we need to make sure all default instances that this one might
// depend on are constructed first.
printer->Print(
"$classname$::default_instance_ = new $classname$();\n",
"classname", classname_);
// Handle nested types.
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateDefaultInstanceAllocator(printer);
}
}
void MessageGenerator::
GenerateDefaultInstanceInitializer(io::Printer* printer) {
printer->Print(
"$classname$::default_instance_->InitAsDefaultInstance();\n",
"classname", classname_);
// Register extensions.
for (int i = 0; i < descriptor_->extension_count(); i++) {
extension_generators_[i]->GenerateRegistration(printer);
}
// Handle nested types.
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateDefaultInstanceInitializer(printer);
}
}
void MessageGenerator::
GenerateClassMethods(io::Printer* printer) {
for (int i = 0; i < descriptor_->enum_type_count(); i++) {
enum_generators_[i]->GenerateMethods(printer);
}
for (int i = 0; i < descriptor_->nested_type_count(); i++) {
nested_generators_[i]->GenerateClassMethods(printer);
printer->Print("\n");
printer->Print(kThinSeparator);
printer->Print("\n");
}
// Generate non-inline field definitions.
for (int i = 0; i < descriptor_->field_count(); i++) {
field_generators_.get(descriptor_->field(i))
.GenerateNonInlineAccessorDefinitions(printer);
}
// Generate field number constants.
printer->Print("#ifndef _MSC_VER\n");
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor *field = descriptor_->field(i);
printer->Print(
"const int $classname$::$constant_name$;\n",
"classname", ClassName(FieldScope(field), false),
"constant_name", FieldConstantName(field));
}
printer->Print(
"#endif // !_MSC_VER\n"
"\n");
// Define extension identifiers.
for (int i = 0; i < descriptor_->extension_count(); i++) {
extension_generators_[i]->GenerateDefinition(printer);
}
GenerateStructors(printer);
printer->Print("\n");
if (descriptor_->file()->options().optimize_for() == FileOptions::SPEED) {
GenerateClear(printer);
printer->Print("\n");
if (!descriptor_->options().message_set_wire_format()) {
// For message_set_wire_format, we don't generate parsing or
// serialization code even if optimize_for = SPEED, since MessageSet
// encoding is somewhat more complicated than normal extension encoding
// and we'd like to avoid having to implement it in multiple places.
// WireFormat's implementation is probably good enough.
GenerateMergeFromCodedStream(printer);
printer->Print("\n");
GenerateSerializeWithCachedSizes(printer);
printer->Print("\n");
GenerateSerializeWithCachedSizesToArray(printer);
printer->Print("\n");
GenerateByteSize(printer);
printer->Print("\n");
}
GenerateMergeFrom(printer);
printer->Print("\n");
GenerateCopyFrom(printer);
printer->Print("\n");
GenerateSwap(printer);
printer->Print("\n");
GenerateIsInitialized(printer);
printer->Print("\n");
}
printer->Print(
"const ::google::protobuf::Descriptor* $classname$::GetDescriptor() const {\n"
" return descriptor();\n"
"}\n"
"\n"
"const ::google::protobuf::Reflection* $classname$::GetReflection() const {\n"
" protobuf_AssignDescriptorsOnce();\n"
" return $classname$_reflection_;\n"
"}\n",
"classname", classname_);
}
void MessageGenerator::
GenerateOffsets(io::Printer* printer) {
printer->Print(
"static const int $classname$_offsets_[$field_count$] = {\n",
"classname", classname_,
"field_count", SimpleItoa(max(1, descriptor_->field_count())));
printer->Indent();
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
printer->Print(
"GOOGLE_PROTOBUF_GENERATED_MESSAGE_FIELD_OFFSET($classname$, $name$_),\n",
"classname", classname_,
"name", FieldName(field));
}
printer->Outdent();
printer->Print("};\n");
}
void MessageGenerator::
GenerateInitializerList(io::Printer* printer) {
printer->Indent();
printer->Indent();
printer->Print(
"::google::protobuf::Message()");
printer->Outdent();
printer->Outdent();
}
void MessageGenerator::
GenerateSharedConstructorCode(io::Printer* printer) {
printer->Print(
"void $classname$::SharedCtor() {\n",
"classname", classname_);
printer->Indent();
printer->Print(
"_cached_size_ = 0;\n");
for (int i = 0; i < descriptor_->field_count(); i++) {
field_generators_.get(descriptor_->field(i))
.GenerateConstructorCode(printer);
}
printer->Print(
"::memset(_has_bits_, 0, sizeof(_has_bits_));\n");
printer->Outdent();
printer->Print("}\n\n");
}
void MessageGenerator::
GenerateSharedDestructorCode(io::Printer* printer) {
printer->Print(
"void $classname$::SharedDtor() {\n",
"classname", classname_);
printer->Indent();
// Write the destructors for each field.
for (int i = 0; i < descriptor_->field_count(); i++) {
field_generators_.get(descriptor_->field(i))
.GenerateDestructorCode(printer);
}
printer->Print(
"if (this != default_instance_) {\n");
// We need to delete all embedded messages.
// TODO(kenton): If we make unset messages point at default instances
// instead of NULL, then it would make sense to move this code into
// MessageFieldGenerator::GenerateDestructorCode().
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
if (!field->is_repeated() &&
field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
printer->Print(" delete $name$_;\n",
"name", FieldName(field));
}
}
printer->Outdent();
printer->Print(
" }\n"
"}\n"
"\n");
}
void MessageGenerator::
GenerateStructors(io::Printer* printer) {
// Generate the default constructor.
printer->Print(
"$classname$::$classname$()\n"
" : ",
"classname", classname_);
GenerateInitializerList(printer);
printer->Print(" {\n"
" SharedCtor();\n"
"}\n");
printer->Print(
"\n"
"void $classname$::InitAsDefaultInstance() {",
"classname", classname_);
// The default instance needs all of its embedded message pointers
// cross-linked to other default instances. We can't do this initialization
// in the constructor because some other default instances may not have been
// constructed yet at that time.
// TODO(kenton): Maybe all message fields (even for non-default messages)
// should be initialized to point at default instances rather than NULL?
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
if (!field->is_repeated() &&
field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE) {
printer->Print(
" $name$_ = const_cast< $type$*>(&$type$::default_instance());\n",
"name", FieldName(field),
"type", ClassName(field->message_type(), true));
}
}
printer->Print(
"}\n"
"\n");
// Generate the copy constructor.
printer->Print(
"$classname$::$classname$(const $classname$& from)\n"
" : ",
"classname", classname_);
GenerateInitializerList(printer);
printer->Print(" {\n"
" SharedCtor();\n"
" MergeFrom(from);\n"
"}\n"
"\n");
// Generate the shared constructor code.
GenerateSharedConstructorCode(printer);
// Generate the destructor.
printer->Print(
"$classname$::~$classname$() {\n"
" SharedDtor();\n"
"}\n"
"\n",
"classname", classname_);
// Generate the shared destructor code.
GenerateSharedDestructorCode(printer);
printer->Print(
"const ::google::protobuf::Descriptor* $classname$::descriptor() {\n"
" protobuf_AssignDescriptorsOnce();\n"
" return $classname$_descriptor_;\n"
"}\n"
"\n"
"const $classname$& $classname$::default_instance() {\n"
" if (default_instance_ == NULL) $adddescriptorsname$();"
" return *default_instance_;\n"
"}\n"
"\n"
"$classname$* $classname$::default_instance_ = NULL;\n"
"\n"
"$classname$* $classname$::New() const {\n"
" return new $classname$;\n"
"}\n",
"classname", classname_,
"adddescriptorsname",
GlobalAddDescriptorsName(descriptor_->file()->name()));
}
void MessageGenerator::
GenerateClear(io::Printer* printer) {
printer->Print("void $classname$::Clear() {\n",
"classname", classname_);
printer->Indent();
int last_index = -1;
if (descriptor_->extension_range_count() > 0) {
printer->Print("_extensions_.Clear();\n");
}
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
if (!field->is_repeated()) {
map<string, string> vars;
vars["index"] = SimpleItoa(field->index());
// We can use the fact that _has_bits_ is a giant bitfield to our
// advantage: We can check up to 32 bits at a time for equality to
// zero, and skip the whole range if so. This can improve the speed
// of Clear() for messages which contain a very large number of
// optional fields of which only a few are used at a time. Here,
// we've chosen to check 8 bits at a time rather than 32.
if (i / 8 != last_index / 8 || last_index < 0) {
if (last_index >= 0) {
printer->Outdent();
printer->Print("}\n");
}
printer->Print(vars,
"if (_has_bits_[$index$ / 32] & (0xffu << ($index$ % 32))) {\n");
printer->Indent();
}
last_index = i;
// It's faster to just overwrite primitive types, but we should
// only clear strings and messages if they were set.
// TODO(kenton): Let the CppFieldGenerator decide this somehow.
bool should_check_bit =
field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE ||
field->cpp_type() == FieldDescriptor::CPPTYPE_STRING;
if (should_check_bit) {
printer->Print(vars, "if (_has_bit($index$)) {\n");
printer->Indent();
}
field_generators_.get(field).GenerateClearingCode(printer);
if (should_check_bit) {
printer->Outdent();
printer->Print("}\n");
}
}
}
if (last_index >= 0) {
printer->Outdent();
printer->Print("}\n");
}
// Repeated fields don't use _has_bits_ so we clear them in a separate
// pass.
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
if (field->is_repeated()) {
field_generators_.get(field).GenerateClearingCode(printer);
}
}
printer->Print(
"::memset(_has_bits_, 0, sizeof(_has_bits_));\n"
"mutable_unknown_fields()->Clear();\n");
printer->Outdent();
printer->Print("}\n");
}
void MessageGenerator::
GenerateSwap(io::Printer* printer) {
// Generate the Swap member function.
printer->Print("void $classname$::Swap($classname$* other) {\n",
"classname", classname_);
printer->Indent();
printer->Print("if (other != this) {\n");
printer->Indent();
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
field_generators_.get(field).GenerateSwappingCode(printer);
}
for (int i = 0; i < (descriptor_->field_count() + 31) / 32; ++i) {
printer->Print("std::swap(_has_bits_[$i$], other->_has_bits_[$i$]);\n",
"i", SimpleItoa(i));
}
printer->Print("_unknown_fields_.Swap(&other->_unknown_fields_);\n");
printer->Print("std::swap(_cached_size_, other->_cached_size_);\n");
if (descriptor_->extension_range_count() > 0) {
printer->Print("_extensions_.Swap(&other->_extensions_);\n");
}
printer->Outdent();
printer->Print("}\n");
printer->Outdent();
printer->Print("}\n");
}
void MessageGenerator::
GenerateMergeFrom(io::Printer* printer) {
// Generate the generalized MergeFrom (aka that which takes in the Message
// base class as a parameter).
printer->Print(
"void $classname$::MergeFrom(const ::google::protobuf::Message& from) {\n"
" GOOGLE_CHECK_NE(&from, this);\n",
"classname", classname_);
printer->Indent();
// Cast the message to the proper type. If we find that the message is
// *not* of the proper type, we can still call Merge via the reflection
// system, as the GOOGLE_CHECK above ensured that we have the same descriptor
// for each message.
printer->Print(
"const $classname$* source =\n"
" ::google::protobuf::internal::dynamic_cast_if_available<const $classname$*>(\n"
" &from);\n"
"if (source == NULL) {\n"
" ::google::protobuf::internal::ReflectionOps::Merge(from, this);\n"
"} else {\n"
" MergeFrom(*source);\n"
"}\n",
"classname", classname_);
printer->Outdent();
printer->Print("}\n\n");
// Generate the class-specific MergeFrom, which avoids the GOOGLE_CHECK and cast.
printer->Print(
"void $classname$::MergeFrom(const $classname$& from) {\n"
" GOOGLE_CHECK_NE(&from, this);\n",
"classname", classname_);
printer->Indent();
// Merge Repeated fields. These fields do not require a
// check as we can simply iterate over them.
for (int i = 0; i < descriptor_->field_count(); ++i) {
const FieldDescriptor* field = descriptor_->field(i);
if (field->is_repeated()) {
field_generators_.get(field).GenerateMergingCode(printer);
}
}
// Merge Optional and Required fields (after a _has_bit check).
int last_index = -1;
for (int i = 0; i < descriptor_->field_count(); ++i) {
const FieldDescriptor* field = descriptor_->field(i);
if (!field->is_repeated()) {
map<string, string> vars;
vars["index"] = SimpleItoa(field->index());
// See above in GenerateClear for an explanation of this.
if (i / 8 != last_index / 8 || last_index < 0) {
if (last_index >= 0) {
printer->Outdent();
printer->Print("}\n");
}
printer->Print(vars,
"if (from._has_bits_[$index$ / 32] & (0xffu << ($index$ % 32))) {\n");
printer->Indent();
}
last_index = i;
printer->Print(vars,
"if (from._has_bit($index$)) {\n");
printer->Indent();
field_generators_.get(field).GenerateMergingCode(printer);
printer->Outdent();
printer->Print("}\n");
}
}
if (last_index >= 0) {
printer->Outdent();
printer->Print("}\n");
}
if (descriptor_->extension_range_count() > 0) {
printer->Print("_extensions_.MergeFrom(from._extensions_);\n");
}
printer->Print(
"mutable_unknown_fields()->MergeFrom(from.unknown_fields());\n");
printer->Outdent();
printer->Print("}\n");
}
void MessageGenerator::
GenerateCopyFrom(io::Printer* printer) {
// Generate the generalized CopyFrom (aka that which takes in the Message
// base class as a parameter).
printer->Print(
"void $classname$::CopyFrom(const ::google::protobuf::Message& from) {\n",
"classname", classname_);
printer->Indent();
printer->Print(
"if (&from == this) return;\n"
"Clear();\n"
"MergeFrom(from);\n");
printer->Outdent();
printer->Print("}\n\n");
// Generate the class-specific CopyFrom.
printer->Print(
"void $classname$::CopyFrom(const $classname$& from) {\n",
"classname", classname_);
printer->Indent();
printer->Print(
"if (&from == this) return;\n"
"Clear();\n"
"MergeFrom(from);\n");
printer->Outdent();
printer->Print("}\n");
}
void MessageGenerator::
GenerateMergeFromCodedStream(io::Printer* printer) {
printer->Print(
"bool $classname$::MergePartialFromCodedStream(\n"
" ::google::protobuf::io::CodedInputStream* input) {\n"
"#define DO_(EXPRESSION) if (!(EXPRESSION)) return false\n"
" ::google::protobuf::uint32 tag;\n"
" while ((tag = input->ReadTag()) != 0) {\n",
"classname", classname_);
printer->Indent();
printer->Indent();
if (descriptor_->field_count() > 0) {
// We don't even want to print the switch() if we have no fields because
// MSVC dislikes switch() statements that contain only a default value.
// Note: If we just switched on the tag rather than the field number, we
// could avoid the need for the if() to check the wire type at the beginning
// of each case. However, this is actually a bit slower in practice as it
// creates a jump table that is 8x larger and sparser, and meanwhile the
// if()s are highly predictable.
printer->Print(
"switch (::google::protobuf::internal::WireFormat::GetTagFieldNumber(tag)) {\n");
printer->Indent();
scoped_array<const FieldDescriptor*> ordered_fields(
SortFieldsByNumber(descriptor_));
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = ordered_fields[i];
PrintFieldComment(printer, field);
printer->Print(
"case $number$: {\n"
" if (::google::protobuf::internal::WireFormat::GetTagWireType(tag) !=\n"
" ::google::protobuf::internal::WireFormat::WIRETYPE_$wiretype$) {\n"
" goto handle_uninterpreted;\n"
" }\n",
"number", SimpleItoa(field->number()),
"wiretype", kWireTypeNames[WireFormat::WireTypeForField(field)]);
if (i > 0 || (field->is_repeated() && !field->options().packed())) {
printer->Print(
" parse_$name$:\n",
"name", field->name());
}
printer->Indent();
field_generators_.get(field).GenerateMergeFromCodedStream(printer);
// switch() is slow since it can't be predicted well. Insert some if()s
// here that attempt to predict the next tag.
if (field->is_repeated() && !field->options().packed()) {
// Expect repeats of this field.
printer->Print(
"if (input->ExpectTag($tag$)) goto parse_$name$;\n",
"tag", SimpleItoa(WireFormat::MakeTag(field)),
"name", field->name());
}
if (i + 1 < descriptor_->field_count()) {
// Expect the next field in order.
const FieldDescriptor* next_field = ordered_fields[i + 1];
printer->Print(
"if (input->ExpectTag($next_tag$)) goto parse_$next_name$;\n",
"next_tag", SimpleItoa(WireFormat::MakeTag(next_field)),
"next_name", next_field->name());
} else {
// Expect EOF.
// TODO(kenton): Expect group end-tag?
printer->Print(
"if (input->ExpectAtEnd()) return true;\n");
}
printer->Print(
"break;\n");
printer->Outdent();
printer->Print("}\n\n");
}
printer->Print(
"default: {\n"
"handle_uninterpreted:\n");
printer->Indent();
}
// Is this an end-group tag? If so, this must be the end of the message.
printer->Print(
"if (::google::protobuf::internal::WireFormat::GetTagWireType(tag) ==\n"
" ::google::protobuf::internal::WireFormat::WIRETYPE_END_GROUP) {\n"
" return true;\n"
"}\n");
// Handle extension ranges.
if (descriptor_->extension_range_count() > 0) {
printer->Print(
"if (");
for (int i = 0; i < descriptor_->extension_range_count(); i++) {
const Descriptor::ExtensionRange* range =
descriptor_->extension_range(i);
if (i > 0) printer->Print(" ||\n ");
uint32 start_tag = WireFormat::MakeTag(
range->start, static_cast<WireFormat::WireType>(0));
uint32 end_tag = WireFormat::MakeTag(
range->end, static_cast<WireFormat::WireType>(0));
if (range->end > FieldDescriptor::kMaxNumber) {
printer->Print(
"($start$u <= tag)",
"start", SimpleItoa(start_tag));
} else {
printer->Print(
"($start$u <= tag && tag < $end$u)",
"start", SimpleItoa(start_tag),
"end", SimpleItoa(end_tag));
}
}
printer->Print(") {\n"
" DO_(_extensions_.ParseField(tag, input, default_instance_,\n"
" mutable_unknown_fields()));\n"
" continue;\n"
"}\n");
}
// We really don't recognize this tag. Skip it.
printer->Print(
"DO_(::google::protobuf::internal::WireFormat::SkipField(\n"
" input, tag, mutable_unknown_fields()));\n");
if (descriptor_->field_count() > 0) {
printer->Print("break;\n");
printer->Outdent();
printer->Print("}\n"); // default:
printer->Outdent();
printer->Print("}\n"); // switch
}
printer->Outdent();
printer->Outdent();
printer->Print(
" }\n" // while
" return true;\n"
"#undef DO_\n"
"}\n");
}
void MessageGenerator::GenerateSerializeOneField(
io::Printer* printer, const FieldDescriptor* field, bool to_array) {
PrintFieldComment(printer, field);
if (!field->is_repeated()) {
printer->Print(
"if (_has_bit($index$)) {\n",
"index", SimpleItoa(field->index()));
printer->Indent();
}
if (to_array) {
field_generators_.get(field).GenerateSerializeWithCachedSizesToArray(
printer);
} else {
field_generators_.get(field).GenerateSerializeWithCachedSizes(printer);
}
if (!field->is_repeated()) {
printer->Outdent();
printer->Print("}\n");
}
printer->Print("\n");
}
void MessageGenerator::GenerateSerializeOneExtensionRange(
io::Printer* printer, const Descriptor::ExtensionRange* range,
bool to_array) {
map<string, string> vars;
vars["start"] = SimpleItoa(range->start);
vars["end"] = SimpleItoa(range->end);
printer->Print(vars,
"// Extension range [$start$, $end$)\n");
if (to_array) {
printer->Print(vars,
"target = _extensions_.SerializeWithCachedSizesToArray(\n"
" $start$, $end$, target);\n\n");
} else {
printer->Print(vars,
"_extensions_.SerializeWithCachedSizes(\n"
" $start$, $end$, output);\n\n");
}
}
void MessageGenerator::
GenerateSerializeWithCachedSizes(io::Printer* printer) {
printer->Print(
"void $classname$::SerializeWithCachedSizes(\n"
" ::google::protobuf::io::CodedOutputStream* output) const {\n",
"classname", classname_);
printer->Indent();
printer->Print(
"::google::protobuf::uint8* raw_buffer = "
"output->GetDirectBufferForNBytesAndAdvance(_cached_size_);\n"
"if (raw_buffer != NULL) {\n"
" $classname$::SerializeWithCachedSizesToArray(raw_buffer);\n"
" return;\n"
"}\n"
"\n",
"classname", classname_);
GenerateSerializeWithCachedSizesBody(printer, false);
printer->Outdent();
printer->Print(
"}\n");
}
void MessageGenerator::
GenerateSerializeWithCachedSizesToArray(io::Printer* printer) {
printer->Print(
"::google::protobuf::uint8* $classname$::SerializeWithCachedSizesToArray(\n"
" ::google::protobuf::uint8* target) const {\n",
"classname", classname_);
printer->Indent();
GenerateSerializeWithCachedSizesBody(printer, true);
printer->Outdent();
printer->Print(
" return target;\n"
"}\n");
}
void MessageGenerator::
GenerateSerializeWithCachedSizesBody(io::Printer* printer, bool to_array) {
scoped_array<const FieldDescriptor*> ordered_fields(
SortFieldsByNumber(descriptor_));
vector<const Descriptor::ExtensionRange*> sorted_extensions;
for (int i = 0; i < descriptor_->extension_range_count(); ++i) {
sorted_extensions.push_back(descriptor_->extension_range(i));
}
sort(sorted_extensions.begin(), sorted_extensions.end(),
ExtensionRangeSorter());
// Merge the fields and the extension ranges, both sorted by field number.
int i, j;
for (i = 0, j = 0;
i < descriptor_->field_count() || j < sorted_extensions.size();
) {
if (i == descriptor_->field_count()) {
GenerateSerializeOneExtensionRange(printer,
sorted_extensions[j++],
to_array);
} else if (j == sorted_extensions.size()) {
GenerateSerializeOneField(printer, ordered_fields[i++], to_array);
} else if (ordered_fields[i]->number() < sorted_extensions[j]->start) {
GenerateSerializeOneField(printer, ordered_fields[i++], to_array);
} else {
GenerateSerializeOneExtensionRange(printer,
sorted_extensions[j++],
to_array);
}
}
printer->Print("if (!unknown_fields().empty()) {\n");
printer->Indent();
if (to_array) {
printer->Print(
"target = "
"::google::protobuf::internal::WireFormat::SerializeUnknownFieldsToArray(\n"
" unknown_fields(), target);\n");
} else {
printer->Print(
"::google::protobuf::internal::WireFormat::SerializeUnknownFields(\n"
" unknown_fields(), output);\n");
}
printer->Outdent();
printer->Print(
"}\n");
}
void MessageGenerator::
GenerateByteSize(io::Printer* printer) {
printer->Print(
"int $classname$::ByteSize() const {\n",
"classname", classname_);
printer->Indent();
printer->Print(
"int total_size = 0;\n"
"\n");
int last_index = -1;
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
if (!field->is_repeated()) {
// See above in GenerateClear for an explanation of this.
// TODO(kenton): Share code? Unclear how to do so without
// over-engineering.
if ((i / 8) != (last_index / 8) ||
last_index < 0) {
if (last_index >= 0) {
printer->Outdent();
printer->Print("}\n");
}
printer->Print(
"if (_has_bits_[$index$ / 32] & (0xffu << ($index$ % 32))) {\n",
"index", SimpleItoa(field->index()));
printer->Indent();
}
last_index = i;
PrintFieldComment(printer, field);
printer->Print(
"if (has_$name$()) {\n",
"name", FieldName(field));
printer->Indent();
field_generators_.get(field).GenerateByteSize(printer);
printer->Outdent();
printer->Print(
"}\n"
"\n");
}
}
if (last_index >= 0) {
printer->Outdent();
printer->Print("}\n");
}
// Repeated fields don't use _has_bits_ so we count them in a separate
// pass.
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
if (field->is_repeated()) {
PrintFieldComment(printer, field);
field_generators_.get(field).GenerateByteSize(printer);
printer->Print("\n");
}
}
if (descriptor_->extension_range_count() > 0) {
printer->Print(
"total_size += _extensions_.ByteSize();\n"
"\n");
}
printer->Print("if (!unknown_fields().empty()) {\n");
printer->Indent();
printer->Print(
"total_size +=\n"
" ::google::protobuf::internal::WireFormat::ComputeUnknownFieldsSize(\n"
" unknown_fields());\n");
printer->Outdent();
printer->Print("}\n");
// We update _cached_size_ even though this is a const method. In theory,
// this is not thread-compatible, because concurrent writes have undefined
// results. In practice, since any concurrent writes will be writing the
// exact same value, it works on all common processors. In a future version
// of C++, _cached_size_ should be made into an atomic<int>.
printer->Print(
"_cached_size_ = total_size;\n"
"return total_size;\n");
printer->Outdent();
printer->Print("}\n");
}
void MessageGenerator::
GenerateIsInitialized(io::Printer* printer) {
printer->Print(
"bool $classname$::IsInitialized() const {\n",
"classname", classname_);
printer->Indent();
// Check that all required fields in this message are set. We can do this
// most efficiently by checking 32 "has bits" at a time.
int has_bits_array_size = (descriptor_->field_count() + 31) / 32;
for (int i = 0; i < has_bits_array_size; i++) {
uint32 mask = 0;
for (int bit = 0; bit < 32; bit++) {
int index = i * 32 + bit;
if (index >= descriptor_->field_count()) break;
const FieldDescriptor* field = descriptor_->field(index);
if (field->is_required()) {
mask |= 1 << bit;
}
}
if (mask != 0) {
char buffer[kFastToBufferSize];
printer->Print(
"if ((_has_bits_[$i$] & 0x$mask$) != 0x$mask$) return false;\n",
"i", SimpleItoa(i),
"mask", FastHex32ToBuffer(mask, buffer));
}
}
// Now check that all embedded messages are initialized.
printer->Print("\n");
for (int i = 0; i < descriptor_->field_count(); i++) {
const FieldDescriptor* field = descriptor_->field(i);
if (field->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
HasRequiredFields(field->message_type())) {
if (field->is_repeated()) {
printer->Print(
"for (int i = 0; i < $name$_size(); i++) {\n"
" if (!this->$name$(i).IsInitialized()) return false;\n"
"}\n",
"name", FieldName(field));
} else {
printer->Print(
"if (has_$name$()) {\n"
" if (!this->$name$().IsInitialized()) return false;\n"
"}\n",
"name", FieldName(field));
}
}
}
if (descriptor_->extension_range_count() > 0) {
printer->Print(
"\n"
"if (!_extensions_.IsInitialized()) return false;");
}
printer->Outdent();
printer->Print(
" return true;\n"
"}\n");
}
} // namespace cpp
} // namespace compiler
} // namespace protobuf
} // namespace google
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