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In OSS mode omit some extern template specializations. We have seen reports of

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compilers falling over due to the size of translation units.

PiperOrigin-RevId: 549653990
pull/13369/head
Protobuf Team Bot 1 year ago committed by Sandy Zhang
parent 87ffe68c72
commit 2ed49c95f9
9 changed files with 28 additions and 221 deletions
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  1. 7
      src/google/protobuf/compiler/cpp/file.cc
  2. 8
      src/google/protobuf/compiler/cpp/helpers.h
  3. 2
      src/google/protobuf/compiler/cpp/message.cc
  4. 16
      src/google/protobuf/compiler/plugin.pb.cc
  5. 8
      src/google/protobuf/compiler/plugin.pb.h
  6. 4
      src/google/protobuf/cpp_features.pb.cc
  7. 2
      src/google/protobuf/cpp_features.pb.h
  8. 120
      src/google/protobuf/descriptor.pb.cc
  9. 60
      src/google/protobuf/descriptor.pb.h

7
src/google/protobuf/compiler/cpp/file.cc
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@ -1242,13 +1242,20 @@ class FileGenerator::ForwardDeclarations {
} }
void PrintTopLevelDecl(io::Printer* p, const Options& options) const { void PrintTopLevelDecl(io::Printer* p, const Options& options) const {
if (ShouldGenerateExternSpecializations(options)) {
for (const auto& c : classes_) { for (const auto& c : classes_) {
// To reduce total linker input size in large binaries we make these
// functions extern and define then in the pb.cc file. This avoids bloat
// in callers by having duplicate definitions of the template.
// However, it increases the size of the pb.cc translation units so it
// is a tradeoff.
p->Emit({{"class", QualifiedClassName(c.second, options)}}, R"cc( p->Emit({{"class", QualifiedClassName(c.second, options)}}, R"cc(
template <> template <>
$dllexport_decl $$class$* Arena::CreateMaybeMessage<$class$>(Arena*); $dllexport_decl $$class$* Arena::CreateMaybeMessage<$class$>(Arena*);
)cc"); )cc");
} }
} }
}
private: private:
absl::btree_map<std::string, const Descriptor*> classes_; absl::btree_map<std::string, const Descriptor*> classes_;

8
src/google/protobuf/compiler/cpp/helpers.h
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@ -1008,6 +1008,14 @@ void GenerateUtf8CheckCodeForCord(io::Printer* p, const FieldDescriptor* field,
const Options& options, bool for_parse, const Options& options, bool for_parse,
absl::string_view parameters); absl::string_view parameters);
inline bool ShouldGenerateExternSpecializations(const Options& options) {
// For OSS we omit the specializations to reduce codegen size.
// Some compilers can't handle that much input in a single translation unit.
// These specializations are just a link size optimization and do not affect
// correctness or performance, so it is ok to omit them.
return !options.opensource_runtime;
}
struct OneOfRangeImpl { struct OneOfRangeImpl {
struct Iterator { struct Iterator {
using iterator_category = std::forward_iterator_tag; using iterator_category = std::forward_iterator_tag;

2
src/google/protobuf/compiler/cpp/message.cc
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@ -2953,6 +2953,7 @@ void MessageGenerator::GenerateSourceInProto2Namespace(io::Printer* p) {
auto v = p->WithVars(ClassVars(descriptor_, options_)); auto v = p->WithVars(ClassVars(descriptor_, options_));
auto t = p->WithVars(MakeTrackerCalls(descriptor_, options_)); auto t = p->WithVars(MakeTrackerCalls(descriptor_, options_));
Formatter format(p); Formatter format(p);
if (ShouldGenerateExternSpecializations(options_)) {
format( format(
"template<> " "template<> "
"PROTOBUF_NOINLINE $classtype$*\n" "PROTOBUF_NOINLINE $classtype$*\n"
@ -2960,6 +2961,7 @@ void MessageGenerator::GenerateSourceInProto2Namespace(io::Printer* p) {
" return Arena::CreateMessageInternal< $classtype$ >(arena);\n" " return Arena::CreateMessageInternal< $classtype$ >(arena);\n"
"}\n"); "}\n");
} }
}
void MessageGenerator::GenerateClear(io::Printer* p) { void MessageGenerator::GenerateClear(io::Printer* p) {
if (HasSimpleBaseClass(descriptor_, options_)) return; if (HasSimpleBaseClass(descriptor_, options_)) return;

16
src/google/protobuf/compiler/plugin.pb.cc
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@ -1584,22 +1584,6 @@ void CodeGeneratorResponse::InternalSwap(CodeGeneratorResponse* other) {
} // namespace google } // namespace google
namespace google { namespace google {
namespace protobuf { namespace protobuf {
template<> PROTOBUF_NOINLINE ::google::protobuf::compiler::Version*
Arena::CreateMaybeMessage< ::google::protobuf::compiler::Version >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::compiler::Version >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::compiler::CodeGeneratorRequest*
Arena::CreateMaybeMessage< ::google::protobuf::compiler::CodeGeneratorRequest >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::compiler::CodeGeneratorRequest >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::compiler::CodeGeneratorResponse_File*
Arena::CreateMaybeMessage< ::google::protobuf::compiler::CodeGeneratorResponse_File >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::compiler::CodeGeneratorResponse_File >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::compiler::CodeGeneratorResponse*
Arena::CreateMaybeMessage< ::google::protobuf::compiler::CodeGeneratorResponse >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::compiler::CodeGeneratorResponse >(arena);
}
} // namespace protobuf } // namespace protobuf
} // namespace google } // namespace google
// @@protoc_insertion_point(global_scope) // @@protoc_insertion_point(global_scope)

8
src/google/protobuf/compiler/plugin.pb.h
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@ -77,14 +77,6 @@ class Version;
struct VersionDefaultTypeInternal; struct VersionDefaultTypeInternal;
PROTOC_EXPORT extern VersionDefaultTypeInternal _Version_default_instance_; PROTOC_EXPORT extern VersionDefaultTypeInternal _Version_default_instance_;
} // namespace compiler } // namespace compiler
template <>
PROTOC_EXPORT ::google::protobuf::compiler::CodeGeneratorRequest* Arena::CreateMaybeMessage<::google::protobuf::compiler::CodeGeneratorRequest>(Arena*);
template <>
PROTOC_EXPORT ::google::protobuf::compiler::CodeGeneratorResponse* Arena::CreateMaybeMessage<::google::protobuf::compiler::CodeGeneratorResponse>(Arena*);
template <>
PROTOC_EXPORT ::google::protobuf::compiler::CodeGeneratorResponse_File* Arena::CreateMaybeMessage<::google::protobuf::compiler::CodeGeneratorResponse_File>(Arena*);
template <>
PROTOC_EXPORT ::google::protobuf::compiler::Version* Arena::CreateMaybeMessage<::google::protobuf::compiler::Version>(Arena*);
} // namespace protobuf } // namespace protobuf
} // namespace google } // namespace google

4
src/google/protobuf/cpp_features.pb.cc
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@ -296,10 +296,6 @@ PROTOBUF_CONSTINIT PROTOBUF_EXPORT PROTOBUF_ATTRIBUTE_INIT_PRIORITY2
} // namespace pb } // namespace pb
namespace google { namespace google {
namespace protobuf { namespace protobuf {
template<> PROTOBUF_NOINLINE ::pb::CppFeatures*
Arena::CreateMaybeMessage< ::pb::CppFeatures >(Arena* arena) {
return Arena::CreateMessageInternal< ::pb::CppFeatures >(arena);
}
} // namespace protobuf } // namespace protobuf
} // namespace google } // namespace google
// @@protoc_insertion_point(global_scope) // @@protoc_insertion_point(global_scope)

2
src/google/protobuf/cpp_features.pb.h
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@ -61,8 +61,6 @@ PROTOBUF_EXPORT extern CppFeaturesDefaultTypeInternal _CppFeatures_default_insta
} // namespace pb } // namespace pb
namespace google { namespace google {
namespace protobuf { namespace protobuf {
template <>
PROTOBUF_EXPORT ::pb::CppFeatures* Arena::CreateMaybeMessage<::pb::CppFeatures>(Arena*);
} // namespace protobuf } // namespace protobuf
} // namespace google } // namespace google

120
src/google/protobuf/descriptor.pb.cc
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@ -13122,126 +13122,6 @@ void GeneratedCodeInfo::InternalSwap(GeneratedCodeInfo* other) {
} // namespace google } // namespace google
namespace google { namespace google {
namespace protobuf { namespace protobuf {
template<> PROTOBUF_NOINLINE ::google::protobuf::FileDescriptorSet*
Arena::CreateMaybeMessage< ::google::protobuf::FileDescriptorSet >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::FileDescriptorSet >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::FileDescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::FileDescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::FileDescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::DescriptorProto_ExtensionRange*
Arena::CreateMaybeMessage< ::google::protobuf::DescriptorProto_ExtensionRange >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::DescriptorProto_ExtensionRange >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::DescriptorProto_ReservedRange*
Arena::CreateMaybeMessage< ::google::protobuf::DescriptorProto_ReservedRange >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::DescriptorProto_ReservedRange >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::DescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::DescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::DescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::ExtensionRangeOptions_Declaration*
Arena::CreateMaybeMessage< ::google::protobuf::ExtensionRangeOptions_Declaration >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::ExtensionRangeOptions_Declaration >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::ExtensionRangeOptions*
Arena::CreateMaybeMessage< ::google::protobuf::ExtensionRangeOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::ExtensionRangeOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::FieldDescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::FieldDescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::FieldDescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::OneofDescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::OneofDescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::OneofDescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::EnumDescriptorProto_EnumReservedRange*
Arena::CreateMaybeMessage< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::EnumDescriptorProto_EnumReservedRange >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::EnumDescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::EnumDescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::EnumDescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::EnumValueDescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::EnumValueDescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::EnumValueDescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::ServiceDescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::ServiceDescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::ServiceDescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::MethodDescriptorProto*
Arena::CreateMaybeMessage< ::google::protobuf::MethodDescriptorProto >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::MethodDescriptorProto >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::FileOptions*
Arena::CreateMaybeMessage< ::google::protobuf::FileOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::FileOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::MessageOptions*
Arena::CreateMaybeMessage< ::google::protobuf::MessageOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::MessageOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::FieldOptions_EditionDefault*
Arena::CreateMaybeMessage< ::google::protobuf::FieldOptions_EditionDefault >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::FieldOptions_EditionDefault >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::FieldOptions*
Arena::CreateMaybeMessage< ::google::protobuf::FieldOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::FieldOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::OneofOptions*
Arena::CreateMaybeMessage< ::google::protobuf::OneofOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::OneofOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::EnumOptions*
Arena::CreateMaybeMessage< ::google::protobuf::EnumOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::EnumOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::EnumValueOptions*
Arena::CreateMaybeMessage< ::google::protobuf::EnumValueOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::EnumValueOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::ServiceOptions*
Arena::CreateMaybeMessage< ::google::protobuf::ServiceOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::ServiceOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::MethodOptions*
Arena::CreateMaybeMessage< ::google::protobuf::MethodOptions >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::MethodOptions >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::UninterpretedOption_NamePart*
Arena::CreateMaybeMessage< ::google::protobuf::UninterpretedOption_NamePart >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::UninterpretedOption_NamePart >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::UninterpretedOption*
Arena::CreateMaybeMessage< ::google::protobuf::UninterpretedOption >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::UninterpretedOption >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::FeatureSet*
Arena::CreateMaybeMessage< ::google::protobuf::FeatureSet >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::FeatureSet >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::SourceCodeInfo_Location*
Arena::CreateMaybeMessage< ::google::protobuf::SourceCodeInfo_Location >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::SourceCodeInfo_Location >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::SourceCodeInfo*
Arena::CreateMaybeMessage< ::google::protobuf::SourceCodeInfo >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::SourceCodeInfo >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::GeneratedCodeInfo_Annotation*
Arena::CreateMaybeMessage< ::google::protobuf::GeneratedCodeInfo_Annotation >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::GeneratedCodeInfo_Annotation >(arena);
}
template<> PROTOBUF_NOINLINE ::google::protobuf::GeneratedCodeInfo*
Arena::CreateMaybeMessage< ::google::protobuf::GeneratedCodeInfo >(Arena* arena) {
return Arena::CreateMessageInternal< ::google::protobuf::GeneratedCodeInfo >(arena);
}
} // namespace protobuf } // namespace protobuf
} // namespace google } // namespace google
// @@protoc_insertion_point(global_scope) // @@protoc_insertion_point(global_scope)

60
src/google/protobuf/descriptor.pb.h
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@ -146,66 +146,6 @@ PROTOBUF_EXPORT extern UninterpretedOptionDefaultTypeInternal _UninterpretedOpti
class UninterpretedOption_NamePart; class UninterpretedOption_NamePart;
struct UninterpretedOption_NamePartDefaultTypeInternal; struct UninterpretedOption_NamePartDefaultTypeInternal;
PROTOBUF_EXPORT extern UninterpretedOption_NamePartDefaultTypeInternal _UninterpretedOption_NamePart_default_instance_; PROTOBUF_EXPORT extern UninterpretedOption_NamePartDefaultTypeInternal _UninterpretedOption_NamePart_default_instance_;
template <>
PROTOBUF_EXPORT ::google::protobuf::DescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::DescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::DescriptorProto_ExtensionRange* Arena::CreateMaybeMessage<::google::protobuf::DescriptorProto_ExtensionRange>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::DescriptorProto_ReservedRange* Arena::CreateMaybeMessage<::google::protobuf::DescriptorProto_ReservedRange>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::EnumDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::EnumDescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::EnumDescriptorProto_EnumReservedRange* Arena::CreateMaybeMessage<::google::protobuf::EnumDescriptorProto_EnumReservedRange>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::EnumOptions* Arena::CreateMaybeMessage<::google::protobuf::EnumOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::EnumValueDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::EnumValueDescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::EnumValueOptions* Arena::CreateMaybeMessage<::google::protobuf::EnumValueOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::ExtensionRangeOptions* Arena::CreateMaybeMessage<::google::protobuf::ExtensionRangeOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::ExtensionRangeOptions_Declaration* Arena::CreateMaybeMessage<::google::protobuf::ExtensionRangeOptions_Declaration>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::FeatureSet* Arena::CreateMaybeMessage<::google::protobuf::FeatureSet>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::FieldDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::FieldDescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::FieldOptions* Arena::CreateMaybeMessage<::google::protobuf::FieldOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::FieldOptions_EditionDefault* Arena::CreateMaybeMessage<::google::protobuf::FieldOptions_EditionDefault>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::FileDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::FileDescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::FileDescriptorSet* Arena::CreateMaybeMessage<::google::protobuf::FileDescriptorSet>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::FileOptions* Arena::CreateMaybeMessage<::google::protobuf::FileOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::GeneratedCodeInfo* Arena::CreateMaybeMessage<::google::protobuf::GeneratedCodeInfo>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::GeneratedCodeInfo_Annotation* Arena::CreateMaybeMessage<::google::protobuf::GeneratedCodeInfo_Annotation>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::MessageOptions* Arena::CreateMaybeMessage<::google::protobuf::MessageOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::MethodDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::MethodDescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::MethodOptions* Arena::CreateMaybeMessage<::google::protobuf::MethodOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::OneofDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::OneofDescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::OneofOptions* Arena::CreateMaybeMessage<::google::protobuf::OneofOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::ServiceDescriptorProto* Arena::CreateMaybeMessage<::google::protobuf::ServiceDescriptorProto>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::ServiceOptions* Arena::CreateMaybeMessage<::google::protobuf::ServiceOptions>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::SourceCodeInfo* Arena::CreateMaybeMessage<::google::protobuf::SourceCodeInfo>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::SourceCodeInfo_Location* Arena::CreateMaybeMessage<::google::protobuf::SourceCodeInfo_Location>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::UninterpretedOption* Arena::CreateMaybeMessage<::google::protobuf::UninterpretedOption>(Arena*);
template <>
PROTOBUF_EXPORT ::google::protobuf::UninterpretedOption_NamePart* Arena::CreateMaybeMessage<::google::protobuf::UninterpretedOption_NamePart>(Arena*);
namespace internal { namespace internal {
#if !defined(PROTOBUF_CONSTINIT_DEFAULT_INSTANCES) #if !defined(PROTOBUF_CONSTINIT_DEFAULT_INSTANCES)
PROTOBUF_EXPORT void InitializeFileDescriptorDefaultInstancesSlow(); PROTOBUF_EXPORT void InitializeFileDescriptorDefaultInstancesSlow();

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