forked from protocolbuffers/protobuf
/
cpp_file.cc
1395 lines (1226 loc) · 46.9 KB
/
cpp_file.cc
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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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 <iostream>
#include <map>
#include <memory>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <google/protobuf/compiler/cpp/cpp_enum.h>
#include <google/protobuf/compiler/cpp/cpp_extension.h>
#include <google/protobuf/compiler/cpp/cpp_field.h>
#include <google/protobuf/compiler/cpp/cpp_helpers.h>
#include <google/protobuf/compiler/cpp/cpp_message.h>
#include <google/protobuf/compiler/cpp/cpp_service.h>
#include <google/protobuf/compiler/scc.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/stubs/strutil.h>
// Must be last.
#include <google/protobuf/port_def.inc>
namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {
namespace {
// When we forward-declare things, we want to create a sorted order so our
// output is deterministic and minimizes namespace changes.
template <class T>
std::string GetSortKey(const T& val) {
return val.full_name();
}
template <>
std::string GetSortKey<FileDescriptor>(const FileDescriptor& val) {
return val.name();
}
template <class T>
bool CompareSortKeys(const T* a, const T* b) {
return GetSortKey(*a) < GetSortKey(*b);
}
template <class T>
std::vector<const T*> Sorted(const std::unordered_set<const T*>& vals) {
std::vector<const T*> sorted(vals.begin(), vals.end());
std::sort(sorted.begin(), sorted.end(), CompareSortKeys<T>);
return sorted;
}
} // namespace
FileGenerator::FileGenerator(const FileDescriptor* file, const Options& options)
: file_(file), options_(options), scc_analyzer_(options) {
// These variables are the same on a file level
SetCommonVars(options, &variables_);
variables_["dllexport_decl"] = options.dllexport_decl;
variables_["tablename"] = UniqueName("TableStruct", file_, options_);
variables_["file_level_metadata"] =
UniqueName("file_level_metadata", file_, options_);
variables_["desc_table"] = DescriptorTableName(file_, options_);
variables_["file_level_enum_descriptors"] =
UniqueName("file_level_enum_descriptors", file_, options_);
variables_["file_level_service_descriptors"] =
UniqueName("file_level_service_descriptors", file_, options_);
variables_["filename"] = file_->name();
variables_["package_ns"] = Namespace(file_, options);
std::vector<const Descriptor*> msgs = FlattenMessagesInFile(file);
for (int i = 0; i < msgs.size(); i++) {
// Deleted in destructor
MessageGenerator* msg_gen =
new MessageGenerator(msgs[i], variables_, i, options, &scc_analyzer_);
message_generators_.emplace_back(msg_gen);
msg_gen->AddGenerators(&enum_generators_, &extension_generators_);
}
for (int i = 0; i < file->enum_type_count(); i++) {
enum_generators_.emplace_back(
new EnumGenerator(file->enum_type(i), variables_, options));
}
for (int i = 0; i < file->service_count(); i++) {
service_generators_.emplace_back(
new ServiceGenerator(file->service(i), variables_, options));
}
if (HasGenericServices(file_, options_)) {
for (int i = 0; i < service_generators_.size(); i++) {
service_generators_[i]->index_in_metadata_ = i;
}
}
for (int i = 0; i < file->extension_count(); i++) {
extension_generators_.emplace_back(
new ExtensionGenerator(file->extension(i), options));
}
for (int i = 0; i < file->weak_dependency_count(); ++i) {
weak_deps_.insert(file->weak_dependency(i));
}
}
FileGenerator::~FileGenerator() = default;
void FileGenerator::GenerateMacroUndefs(io::Printer* printer) {
Formatter format(printer, variables_);
// Only do this for protobuf's own types. There are some google3 protos using
// macros as field names and the generated code compiles after the macro
// expansion. Undefing these macros actually breaks such code.
if (file_->name() != "net/proto2/compiler/proto/plugin.proto" &&
file_->name() != "google/protobuf/compiler/plugin.proto") {
return;
}
std::vector<std::string> names_to_undef;
std::vector<const FieldDescriptor*> fields;
ListAllFields(file_, &fields);
for (int i = 0; i < fields.size(); i++) {
const std::string& name = fields[i]->name();
static const char* kMacroNames[] = {"major", "minor"};
for (int i = 0; i < GOOGLE_ARRAYSIZE(kMacroNames); ++i) {
if (name == kMacroNames[i]) {
names_to_undef.push_back(name);
break;
}
}
}
for (int i = 0; i < names_to_undef.size(); ++i) {
format(
"#ifdef $1$\n"
"#undef $1$\n"
"#endif\n",
names_to_undef[i]);
}
}
void FileGenerator::GenerateHeader(io::Printer* printer) {
Formatter format(printer, variables_);
// port_def.inc must be included after all other includes.
IncludeFile("net/proto2/public/port_def.inc", printer);
format("#define $1$$ dllexport_decl$\n", FileDllExport(file_, options_));
GenerateMacroUndefs(printer);
// For Any support with lite protos, we need to friend AnyMetadata, so we
// forward-declare it here.
format(
"PROTOBUF_NAMESPACE_OPEN\n"
"namespace internal {\n"
"class AnyMetadata;\n"
"} // namespace internal\n"
"PROTOBUF_NAMESPACE_CLOSE\n");
GenerateGlobalStateFunctionDeclarations(printer);
GenerateForwardDeclarations(printer);
{
NamespaceOpener ns(Namespace(file_, options_), format);
format("\n");
GenerateEnumDefinitions(printer);
format(kThickSeparator);
format("\n");
GenerateMessageDefinitions(printer);
format("\n");
format(kThickSeparator);
format("\n");
GenerateServiceDefinitions(printer);
GenerateExtensionIdentifiers(printer);
format("\n");
format(kThickSeparator);
format("\n");
GenerateInlineFunctionDefinitions(printer);
format(
"\n"
"// @@protoc_insertion_point(namespace_scope)\n"
"\n");
}
// We need to specialize some templates in the ::google::protobuf namespace:
GenerateProto2NamespaceEnumSpecializations(printer);
format(
"\n"
"// @@protoc_insertion_point(global_scope)\n"
"\n");
IncludeFile("net/proto2/public/port_undef.inc", printer);
}
void FileGenerator::GenerateProtoHeader(io::Printer* printer,
const std::string& info_path) {
Formatter format(printer, variables_);
if (!options_.proto_h) {
return;
}
GenerateTopHeaderGuard(printer, false);
if (!options_.opensource_runtime) {
format(
"#ifdef SWIG\n"
"#error \"Do not SWIG-wrap protobufs.\"\n"
"#endif // SWIG\n"
"\n");
}
if (IsBootstrapProto(options_, file_)) {
format("// IWYU pragma: private, include \"$1$.proto.h\"\n\n",
StripProto(file_->name()));
}
GenerateLibraryIncludes(printer);
for (int i = 0; i < file_->public_dependency_count(); i++) {
const FileDescriptor* dep = file_->public_dependency(i);
format("#include \"$1$.proto.h\"\n", StripProto(dep->name()));
}
format("// @@protoc_insertion_point(includes)\n");
GenerateMetadataPragma(printer, info_path);
GenerateHeader(printer);
GenerateBottomHeaderGuard(printer, false);
}
void FileGenerator::GeneratePBHeader(io::Printer* printer,
const std::string& info_path) {
Formatter format(printer, variables_);
GenerateTopHeaderGuard(printer, true);
if (options_.proto_h) {
std::string target_basename = StripProto(file_->name());
if (!options_.opensource_runtime) {
GetBootstrapBasename(options_, target_basename, &target_basename);
}
format("#include \"$1$.proto.h\" // IWYU pragma: export\n",
target_basename);
} else {
GenerateLibraryIncludes(printer);
}
if (options_.transitive_pb_h) {
GenerateDependencyIncludes(printer);
}
// This is unfortunately necessary for some plugins. I don't see why we
// need two of the same insertion points.
// TODO(gerbens) remove this.
format("// @@protoc_insertion_point(includes)\n");
GenerateMetadataPragma(printer, info_path);
if (!options_.proto_h) {
GenerateHeader(printer);
} else {
{
NamespaceOpener ns(Namespace(file_, options_), format);
format(
"\n"
"// @@protoc_insertion_point(namespace_scope)\n");
}
format(
"\n"
"// @@protoc_insertion_point(global_scope)\n"
"\n");
}
GenerateBottomHeaderGuard(printer, true);
}
void FileGenerator::DoIncludeFile(const std::string& google3_name,
bool do_export, io::Printer* printer) {
Formatter format(printer, variables_);
const std::string prefix = "net/proto2/";
GOOGLE_CHECK(google3_name.find(prefix) == 0) << google3_name;
if (options_.opensource_runtime) {
std::string path = google3_name.substr(prefix.size());
path = StringReplace(path, "internal/", "", false);
path = StringReplace(path, "proto/", "", false);
path = StringReplace(path, "public/", "", false);
if (options_.runtime_include_base.empty()) {
format("#include <google/protobuf/$1$>", path);
} else {
format("#include \"$1$google/protobuf/$2$\"",
options_.runtime_include_base, path);
}
} else {
format("#include \"$1$\"", google3_name);
}
if (do_export) {
format(" // IWYU pragma: export");
}
format("\n");
}
std::string FileGenerator::CreateHeaderInclude(const std::string& basename,
const FileDescriptor* file) {
bool use_system_include = false;
std::string name = basename;
if (options_.opensource_runtime) {
if (IsWellKnownMessage(file)) {
if (options_.runtime_include_base.empty()) {
use_system_include = true;
} else {
name = options_.runtime_include_base + basename;
}
}
}
std::string left = "\"";
std::string right = "\"";
if (use_system_include) {
left = "<";
right = ">";
}
return left + name + right;
}
void FileGenerator::GenerateSourceIncludes(io::Printer* printer) {
Formatter format(printer, variables_);
std::string target_basename = StripProto(file_->name());
if (!options_.opensource_runtime) {
GetBootstrapBasename(options_, target_basename, &target_basename);
}
target_basename += options_.proto_h ? ".proto.h" : ".pb.h";
format(
"// Generated by the protocol buffer compiler. DO NOT EDIT!\n"
"// source: $filename$\n"
"\n"
"#include $1$\n"
"\n"
"#include <algorithm>\n" // for swap()
"\n",
CreateHeaderInclude(target_basename, file_));
IncludeFile("net/proto2/io/public/coded_stream.h", printer);
// TODO(gerbens) This is to include parse_context.h, we need a better way
IncludeFile("net/proto2/public/extension_set.h", printer);
IncludeFile("net/proto2/public/wire_format_lite.h", printer);
// Unknown fields implementation in lite mode uses StringOutputStream
if (!UseUnknownFieldSet(file_, options_) && !message_generators_.empty()) {
IncludeFile("net/proto2/io/public/zero_copy_stream_impl_lite.h", printer);
}
if (HasDescriptorMethods(file_, options_)) {
IncludeFile("net/proto2/public/descriptor.h", printer);
IncludeFile("net/proto2/public/generated_message_reflection.h", printer);
IncludeFile("net/proto2/public/reflection_ops.h", printer);
IncludeFile("net/proto2/public/wire_format.h", printer);
}
if (options_.proto_h) {
// Use the smaller .proto.h files.
for (int i = 0; i < file_->dependency_count(); i++) {
const FileDescriptor* dep = file_->dependency(i);
// Do not import weak deps.
if (!options_.opensource_runtime && IsDepWeak(dep)) continue;
std::string basename = StripProto(dep->name());
if (IsBootstrapProto(options_, file_)) {
GetBootstrapBasename(options_, basename, &basename);
}
format("#include \"$1$.proto.h\"\n", basename);
}
}
if (HasCordFields(file_, options_)) {
format(
"#include \"third_party/absl/strings/internal/string_constant.h\"\n");
}
format("// @@protoc_insertion_point(includes)\n");
IncludeFile("net/proto2/public/port_def.inc", printer);
// For MSVC builds, we use #pragma init_seg to move the initialization of our
// libraries to happen before the user code.
// This worksaround the fact that MSVC does not do constant initializers when
// required by the standard.
format("\nPROTOBUF_PRAGMA_INIT_SEG\n");
}
void FileGenerator::GenerateSourceDefaultInstance(int idx,
io::Printer* printer) {
Formatter format(printer, variables_);
MessageGenerator* generator = message_generators_[idx].get();
generator->GenerateConstexprConstructor(printer);
// Use a union to disable the destructor of the _instance member.
// We can constant initialize, but the object will still have a non-trivial
// destructor that we need to elide.
format(
"struct $1$ {\n"
" constexpr $1$()\n"
" : _instance(::$proto_ns$::internal::ConstantInitialized{}) {}\n"
" ~$1$() {}\n"
" union {\n"
" $2$ _instance;\n"
" };\n"
"};\n",
DefaultInstanceType(generator->descriptor_, options_),
generator->classname_);
// NO_DESTROY is not necessary for correctness. The empty destructor is
// enough. However, the empty destructor fails to be elided in some
// configurations (like non-opt or with certain sanitizers). NO_DESTROY is
// there just to improve performance and binary size in these builds.
format("PROTOBUF_ATTRIBUTE_NO_DESTROY PROTOBUF_CONSTINIT $1$ $2$;\n",
DefaultInstanceType(generator->descriptor_, options_),
DefaultInstanceName(generator->descriptor_, options_));
if (options_.lite_implicit_weak_fields) {
format("$1$* $2$ = &$3$;\n",
DefaultInstanceType(generator->descriptor_, options_),
DefaultInstancePtr(generator->descriptor_, options_),
DefaultInstanceName(generator->descriptor_, options_));
}
}
// A list of things defined in one .pb.cc file that we need to reference from
// another .pb.cc file.
struct FileGenerator::CrossFileReferences {
// Populated if we are referencing from messages or files.
std::unordered_set<const Descriptor*> weak_default_instances;
// Only if we are referencing from files.
std::unordered_set<const FileDescriptor*> strong_reflection_files;
std::unordered_set<const FileDescriptor*> weak_reflection_files;
};
void FileGenerator::GetCrossFileReferencesForField(const FieldDescriptor* field,
CrossFileReferences* refs) {
const Descriptor* msg = field->message_type();
if (msg == nullptr) return;
if (IsImplicitWeakField(field, options_, &scc_analyzer_) ||
IsWeak(field, options_)) {
refs->weak_default_instances.insert(msg);
}
}
void FileGenerator::GetCrossFileReferencesForFile(const FileDescriptor* file,
CrossFileReferences* refs) {
ForEachField(file, [this, refs](const FieldDescriptor* field) {
GetCrossFileReferencesForField(field, refs);
});
if (!HasDescriptorMethods(file, options_)) return;
for (int i = 0; i < file->dependency_count(); i++) {
const FileDescriptor* dep = file->dependency(i);
if (IsDepWeak(dep)) {
refs->weak_reflection_files.insert(dep);
} else {
refs->strong_reflection_files.insert(dep);
}
}
}
// Generates references to variables defined in other files.
void FileGenerator::GenerateInternalForwardDeclarations(
const CrossFileReferences& refs, io::Printer* printer) {
Formatter format(printer, variables_);
{
NamespaceOpener ns(format);
for (auto instance : Sorted(refs.weak_default_instances)) {
ns.ChangeTo(Namespace(instance, options_));
if (options_.lite_implicit_weak_fields) {
format("extern $1$ $2$;\n", DefaultInstanceType(instance, options_),
DefaultInstanceName(instance, options_));
format("__attribute__((weak)) $1$* $2$ = nullptr;\n",
DefaultInstanceType(instance, options_),
DefaultInstancePtr(instance, options_));
} else {
format("extern __attribute__((weak)) $1$ $2$;\n",
DefaultInstanceType(instance, options_),
DefaultInstanceName(instance, options_));
}
}
}
for (auto file : Sorted(refs.weak_reflection_files)) {
format(
"extern __attribute__((weak)) const "
"::$proto_ns$::internal::DescriptorTable $1$;\n",
DescriptorTableName(file, options_));
}
}
void FileGenerator::GenerateSourceForMessage(int idx, io::Printer* printer) {
Formatter format(printer, variables_);
GenerateSourceIncludes(printer);
CrossFileReferences refs;
ForEachField(message_generators_[idx]->descriptor_,
[this, &refs](const FieldDescriptor* field) {
GetCrossFileReferencesForField(field, &refs);
});
GenerateInternalForwardDeclarations(refs, printer);
{ // package namespace
NamespaceOpener ns(Namespace(file_, options_), format);
// Define default instances
GenerateSourceDefaultInstance(idx, printer);
// Generate classes.
format("\n");
message_generators_[idx]->GenerateClassMethods(printer);
format(
"\n"
"// @@protoc_insertion_point(namespace_scope)\n");
} // end package namespace
{
NamespaceOpener proto_ns(ProtobufNamespace(options_), format);
message_generators_[idx]->GenerateSourceInProto2Namespace(printer);
}
format(
"\n"
"// @@protoc_insertion_point(global_scope)\n");
}
void FileGenerator::GenerateGlobalSource(io::Printer* printer) {
Formatter format(printer, variables_);
GenerateSourceIncludes(printer);
{
GenerateTables(printer);
// Define the code to initialize reflection. This code uses a global
// constructor to register reflection data with the runtime pre-main.
if (HasDescriptorMethods(file_, options_)) {
GenerateReflectionInitializationCode(printer);
}
}
NamespaceOpener ns(Namespace(file_, options_), format);
// Generate enums.
for (int i = 0; i < enum_generators_.size(); i++) {
enum_generators_[i]->GenerateMethods(i, printer);
}
// Define extensions.
for (int i = 0; i < extension_generators_.size(); i++) {
extension_generators_[i]->GenerateDefinition(printer);
}
if (HasGenericServices(file_, options_)) {
// Generate services.
for (int i = 0; i < service_generators_.size(); i++) {
if (i == 0) format("\n");
format(kThickSeparator);
format("\n");
service_generators_[i]->GenerateImplementation(printer);
}
}
}
void FileGenerator::GenerateSource(io::Printer* printer) {
Formatter format(printer, variables_);
GenerateSourceIncludes(printer);
CrossFileReferences refs;
GetCrossFileReferencesForFile(file_, &refs);
GenerateInternalForwardDeclarations(refs, printer);
{
NamespaceOpener ns(Namespace(file_, options_), format);
// Define default instances
for (int i = 0; i < message_generators_.size(); i++) {
GenerateSourceDefaultInstance(i, printer);
}
}
{
GenerateTables(printer);
if (HasDescriptorMethods(file_, options_)) {
// Define the code to initialize reflection. This code uses a global
// constructor to register reflection data with the runtime pre-main.
GenerateReflectionInitializationCode(printer);
}
}
{
NamespaceOpener ns(Namespace(file_, options_), format);
// Actually implement the protos
// Generate enums.
for (int i = 0; i < enum_generators_.size(); i++) {
enum_generators_[i]->GenerateMethods(i, printer);
}
// Generate classes.
for (int i = 0; i < message_generators_.size(); i++) {
format("\n");
format(kThickSeparator);
format("\n");
message_generators_[i]->GenerateClassMethods(printer);
}
if (HasGenericServices(file_, options_)) {
// Generate services.
for (int i = 0; i < service_generators_.size(); i++) {
if (i == 0) format("\n");
format(kThickSeparator);
format("\n");
service_generators_[i]->GenerateImplementation(printer);
}
}
// Define extensions.
for (int i = 0; i < extension_generators_.size(); i++) {
extension_generators_[i]->GenerateDefinition(printer);
}
format(
"\n"
"// @@protoc_insertion_point(namespace_scope)\n");
}
{
NamespaceOpener proto_ns(ProtobufNamespace(options_), format);
for (int i = 0; i < message_generators_.size(); i++) {
message_generators_[i]->GenerateSourceInProto2Namespace(printer);
}
}
format(
"\n"
"// @@protoc_insertion_point(global_scope)\n");
IncludeFile("net/proto2/public/port_undef.inc", printer);
}
void FileGenerator::GenerateReflectionInitializationCode(io::Printer* printer) {
Formatter format(printer, variables_);
if (!message_generators_.empty()) {
format("static ::$proto_ns$::Metadata $file_level_metadata$[$1$];\n",
message_generators_.size());
} else {
format(
"static "
"constexpr ::$proto_ns$::Metadata* $file_level_metadata$ = nullptr;\n");
}
if (!enum_generators_.empty()) {
format(
"static "
"const ::$proto_ns$::EnumDescriptor* "
"$file_level_enum_descriptors$[$1$];\n",
enum_generators_.size());
} else {
format(
"static "
"constexpr ::$proto_ns$::EnumDescriptor const** "
"$file_level_enum_descriptors$ = nullptr;\n");
}
if (HasGenericServices(file_, options_) && file_->service_count() > 0) {
format(
"static "
"const ::$proto_ns$::ServiceDescriptor* "
"$file_level_service_descriptors$[$1$];\n",
file_->service_count());
} else {
format(
"static "
"constexpr ::$proto_ns$::ServiceDescriptor const** "
"$file_level_service_descriptors$ = nullptr;\n");
}
if (!message_generators_.empty()) {
format(
"\n"
"const $uint32$ $tablename$::offsets[] "
"PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {\n");
format.Indent();
std::vector<std::pair<size_t, size_t> > pairs;
pairs.reserve(message_generators_.size());
for (int i = 0; i < message_generators_.size(); i++) {
pairs.push_back(message_generators_[i]->GenerateOffsets(printer));
}
format.Outdent();
format(
"};\n"
"static const ::$proto_ns$::internal::MigrationSchema schemas[] "
"PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {\n");
format.Indent();
{
int offset = 0;
for (int i = 0; i < message_generators_.size(); i++) {
message_generators_[i]->GenerateSchema(printer, offset,
pairs[i].second);
offset += pairs[i].first;
}
}
format.Outdent();
format(
"};\n"
"\nstatic "
"::$proto_ns$::Message const * const file_default_instances[] = {\n");
format.Indent();
for (int i = 0; i < message_generators_.size(); i++) {
const Descriptor* descriptor = message_generators_[i]->descriptor_;
format(
"reinterpret_cast<const "
"::$proto_ns$::Message*>(&$1$::_$2$_default_instance_),\n",
Namespace(descriptor, options_), // 1
ClassName(descriptor)); // 2
}
format.Outdent();
format(
"};\n"
"\n");
} else {
// we still need these symbols to exist
format(
// MSVC doesn't like empty arrays, so we add a dummy.
"const $uint32$ $tablename$::offsets[1] = {};\n"
"static constexpr ::$proto_ns$::internal::MigrationSchema* schemas = "
"nullptr;"
"\n"
"static constexpr ::$proto_ns$::Message* const* "
"file_default_instances = nullptr;\n"
"\n");
}
// ---------------------------------------------------------------
// 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.
const std::string protodef_name =
UniqueName("descriptor_table_protodef", file_, options_);
format("const char $1$[] PROTOBUF_SECTION_VARIABLE(protodesc_cold) =\n",
protodef_name);
format.Indent();
FileDescriptorProto file_proto;
file_->CopyTo(&file_proto);
std::string file_data;
file_proto.SerializeToString(&file_data);
{
if (file_data.size() > 65535) {
// Workaround for MSVC: "Error C1091: compiler limit: string exceeds
// 65535 bytes in length". Declare a static array of chars rather than
// use a string literal. Only write 25 bytes per line.
static const int kBytesPerLine = 25;
format("{ ");
for (int i = 0; i < file_data.size();) {
for (int j = 0; j < kBytesPerLine && i < file_data.size(); ++i, ++j) {
format("'$1$', ", CEscape(file_data.substr(i, 1)));
}
format("\n");
}
format("'\\0' }"); // null-terminate
} else {
// Only write 40 bytes per line.
static const int kBytesPerLine = 40;
for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
format(
"\"$1$\"\n",
EscapeTrigraphs(CEscape(file_data.substr(i, kBytesPerLine))));
}
}
format(";\n");
}
format.Outdent();
CrossFileReferences refs;
GetCrossFileReferencesForFile(file_, &refs);
int num_deps =
refs.strong_reflection_files.size() + refs.weak_reflection_files.size();
// Build array of DescriptorTable deps.
if (num_deps > 0) {
format(
"static const ::$proto_ns$::internal::DescriptorTable*const "
"$desc_table$_deps[$1$] = {\n",
num_deps);
for (auto dep : Sorted(refs.strong_reflection_files)) {
format(" &::$1$,\n", DescriptorTableName(dep, options_));
}
for (auto dep : Sorted(refs.weak_reflection_files)) {
format(" &::$1$,\n", DescriptorTableName(dep, options_));
}
format("};\n");
}
// The DescriptorTable itself.
// Should be "bool eager = NeedsEagerDescriptorAssignment(file_, options_);"
// however this might cause a tsan failure in superroot b/148382879,
// so disable for now.
bool eager = false;
format(
"static ::$proto_ns$::internal::once_flag $desc_table$_once;\n"
"const ::$proto_ns$::internal::DescriptorTable $desc_table$ = {\n"
" false, $1$, $2$, $3$, \"$filename$\", \n"
" &$desc_table$_once, $4$, $5$, $6$,\n"
" schemas, file_default_instances, $tablename$::offsets,\n"
" $file_level_metadata$, $file_level_enum_descriptors$, "
"$file_level_service_descriptors$,\n"
"};\n"
// This function exists to be marked as weak.
// It can significantly speed up compilation by breaking up the SCC.
// Without the weak attribute all the messages in the file, including all
// the vtables and everything they use become part of the same SCC.
// By adding a weak function here we break the connection from the
// individual vtables back into the descriptor table.
"PROTOBUF_ATTRIBUTE_WEAK ::$proto_ns$::Metadata\n"
"$desc_table$_metadata_getter(int index) {\n"
" ::$proto_ns$::internal::AssignDescriptors(&$desc_table$);\n"
" return $desc_table$.file_level_metadata[index];\n"
"}\n"
"\n",
eager ? "true" : "false", file_data.size(), protodef_name,
num_deps == 0 ? "nullptr" : variables_["desc_table"] + "_deps", num_deps,
message_generators_.size());
// For descriptor.proto we want to avoid doing any dynamic initialization,
// because in some situations that would otherwise pull in a lot of
// unnecessary code that can't be stripped by --gc-sections. Descriptor
// initialization will still be performed lazily when it's needed.
if (file_->name() != "net/proto2/proto/descriptor.proto") {
format(
"// Force running AddDescriptors() at dynamic initialization time.\n"
"PROTOBUF_ATTRIBUTE_INIT_PRIORITY "
"static ::$proto_ns$::internal::AddDescriptorsRunner "
"$1$(&$desc_table$);\n",
UniqueName("dynamic_init_dummy", file_, options_));
}
}
void FileGenerator::GenerateTables(io::Printer* printer) {
Formatter format(printer, variables_);
if (options_.table_driven_parsing) {
// TODO(ckennelly): Gate this with the same options flag to enable
// table-driven parsing.
format(
"PROTOBUF_CONSTEXPR_VAR ::$proto_ns$::internal::ParseTableField\n"
" const $tablename$::entries[] "
"PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {\n");
format.Indent();
std::vector<size_t> entries;
size_t count = 0;
for (int i = 0; i < message_generators_.size(); i++) {
size_t value = message_generators_[i]->GenerateParseOffsets(printer);
entries.push_back(value);
count += value;
}
// We need these arrays to exist, and MSVC does not like empty arrays.
if (count == 0) {
format("{0, 0, 0, ::$proto_ns$::internal::kInvalidMask, 0, 0},\n");
}
format.Outdent();
format(
"};\n"
"\n"
"PROTOBUF_CONSTEXPR_VAR "
"::$proto_ns$::internal::AuxiliaryParseTableField\n"
" const $tablename$::aux[] "
"PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {\n");
format.Indent();
std::vector<size_t> aux_entries;
count = 0;
for (int i = 0; i < message_generators_.size(); i++) {
size_t value = message_generators_[i]->GenerateParseAuxTable(printer);
aux_entries.push_back(value);
count += value;
}
if (count == 0) {
format("::$proto_ns$::internal::AuxiliaryParseTableField(),\n");
}
format.Outdent();
format(
"};\n"
"PROTOBUF_CONSTEXPR_VAR ::$proto_ns$::internal::ParseTable const\n"
" $tablename$::schema[] "
"PROTOBUF_SECTION_VARIABLE(protodesc_cold) = {\n");
format.Indent();
size_t offset = 0;
size_t aux_offset = 0;
for (int i = 0; i < message_generators_.size(); i++) {
message_generators_[i]->GenerateParseTable(printer, offset, aux_offset);
offset += entries[i];
aux_offset += aux_entries[i];
}
if (message_generators_.empty()) {
format("{ nullptr, nullptr, 0, -1, -1, false },\n");
}
format.Outdent();
format(
"};\n"
"\n");
}
if (!message_generators_.empty() && options_.table_driven_serialization) {
format(
"const ::$proto_ns$::internal::FieldMetadata "
"$tablename$::field_metadata[] "
"= {\n");
format.Indent();
std::vector<int> field_metadata_offsets;
int idx = 0;
for (int i = 0; i < message_generators_.size(); i++) {
field_metadata_offsets.push_back(idx);
idx += message_generators_[i]->GenerateFieldMetadata(printer);
}
field_metadata_offsets.push_back(idx);
format.Outdent();
format(
"};\n"
"const ::$proto_ns$::internal::SerializationTable "
"$tablename$::serialization_table[] = {\n");
format.Indent();
// We rely on the order we layout the tables to match the order we
// calculate them with FlattenMessagesInFile, so we check here that
// these match exactly.
std::vector<const Descriptor*> calculated_order =
FlattenMessagesInFile(file_);
GOOGLE_CHECK_EQ(calculated_order.size(), message_generators_.size());
for (int i = 0; i < message_generators_.size(); i++) {
GOOGLE_CHECK_EQ(calculated_order[i], message_generators_[i]->descriptor_);
format("{$1$, $tablename$::field_metadata + $2$},\n",
field_metadata_offsets[i + 1] - field_metadata_offsets[i], // 1
field_metadata_offsets[i]); // 2
}
format.Outdent();
format(
"};\n"
"\n");
}
}