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Move `GetClassData` into `MessageLite`. This table will be used to replace several

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virtual functions to reduce binary size and code duplication.
In this same change we replace `OnDemandRegisterArenaDtor` with an entry on the
table to keep the number of virtual functions in `MessageLite` the same to
avoid growth in space constrained systems. We will migrate other functions in
future changes.

PiperOrigin-RevId: 564706001
pull/13926/head
Protobuf Team Bot 1 year ago committed by Copybara-Service
parent 38a24729ec
commit 4eed4eb244
8 changed files with 104 additions and 45 deletions
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  1. 59
      src/google/protobuf/compiler/cpp/message.cc
  2. 4
      src/google/protobuf/compiler/plugin.pb.cc
  3. 1
      src/google/protobuf/cpp_features.pb.cc
  4. 32
      src/google/protobuf/descriptor.pb.cc
  5. 3
      src/google/protobuf/message.cc
  6. 19
      src/google/protobuf/message.h
  7. 12
      src/google/protobuf/message_lite.cc
  8. 19
      src/google/protobuf/message_lite.h

59
src/google/protobuf/compiler/cpp/message.cc
Unescape View File

@ -1564,20 +1564,19 @@ void MessageGenerator::GenerateClassDefinition(io::Printer* p) {
switch (NeedsArenaDestructor()) {
case ArenaDtorNeeds::kOnDemand:
format(
"private:\n"
"static void ArenaDtor(void* object);\n"
"inline void OnDemandRegisterArenaDtor(::$proto_ns$::Arena* arena) "
"override {\n"
" if (arena == nullptr || ($inlined_string_donated_array$[0] & "
"0x1u) "
"== "
"0) {\n"
" return;\n"
" }\n"
" $inlined_string_donated_array$[0] &= 0xFFFFFFFEu;\n"
" arena->OwnCustomDestructor(this, &$classname$::ArenaDtor);\n"
"}\n");
p->Emit(R"cc(
private:
static void ArenaDtor(void* object);
static void OnDemandRegisterArenaDtor(MessageLite& msg,
::$proto_ns$::Arena& arena) {
auto& this_ = static_cast<$classname$&>(msg);
if ((this_.$inlined_string_donated_array$[0] & 0x1u) == 0) {
return;
}
this_.$inlined_string_donated_array$[0] &= 0xFFFFFFFEu;
arena.OwnCustomDestructor(&this_, &$classname$::ArenaDtor);
}
)cc");
break;
case ArenaDtorNeeds::kRequired:
format(
@ -3917,14 +3916,30 @@ void MessageGenerator::GenerateMergeFrom(io::Printer* p) {
// a "from" message that is the same type as the message being merged
// into, rather than a generic Message.
p->Emit(R"cc(
const ::$proto_ns$::Message::ClassData $classname$::_class_data_ = {
$classname$::MergeImpl,
};
const ::$proto_ns$::Message::ClassData* $classname$::GetClassData() const {
return &_class_data_;
}
)cc");
p->Emit(
{
{"on_demand_register_arena_dtor",
[&] {
if (NeedsArenaDestructor() == ArenaDtorNeeds::kOnDemand) {
p->Emit(R"cc(
$classname$::OnDemandRegisterArenaDtor,
)cc");
} else {
p->Emit(R"cc(
nullptr, // OnDemandRegisterArenaDtor
)cc");
}
}},
},
R"cc(
const ::$proto_ns$::Message::ClassData $classname$::_class_data_ = {
$classname$::MergeImpl,
$on_demand_register_arena_dtor$,
};
const ::$proto_ns$::Message::ClassData* $classname$::GetClassData() const {
return &_class_data_;
}
)cc");
} else {
// Generate CheckTypeAndMergeFrom().
format(

4
src/google/protobuf/compiler/plugin.pb.cc
Unescape View File

@ -543,6 +543,7 @@ const ::_pbi::TcParseTable<2, 4, 0, 47, 2> Version::_table_ = {
const ::google::protobuf::Message::ClassData Version::_class_data_ = {
Version::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* Version::GetClassData() const {
return &_class_data_;
@ -888,6 +889,7 @@ const ::_pbi::TcParseTable<3, 5, 3, 79, 2> CodeGeneratorRequest::_table_ = {
const ::google::protobuf::Message::ClassData CodeGeneratorRequest::_class_data_ = {
CodeGeneratorRequest::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* CodeGeneratorRequest::GetClassData() const {
return &_class_data_;
@ -1218,6 +1220,7 @@ const ::_pbi::TcParseTable<2, 4, 1, 86, 2> CodeGeneratorResponse_File::_table_ =
const ::google::protobuf::Message::ClassData CodeGeneratorResponse_File::_class_data_ = {
CodeGeneratorResponse_File::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* CodeGeneratorResponse_File::GetClassData() const {
return &_class_data_;
@ -1491,6 +1494,7 @@ const ::_pbi::TcParseTable<2, 3, 1, 60, 2> CodeGeneratorResponse::_table_ = {
const ::google::protobuf::Message::ClassData CodeGeneratorResponse::_class_data_ = {
CodeGeneratorResponse::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* CodeGeneratorResponse::GetClassData() const {
return &_class_data_;

1
src/google/protobuf/cpp_features.pb.cc
Unescape View File

@ -309,6 +309,7 @@ const ::_pbi::TcParseTable<1, 2, 1, 0, 2> CppFeatures::_table_ = {
const ::google::protobuf::Message::ClassData CppFeatures::_class_data_ = {
CppFeatures::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* CppFeatures::GetClassData() const {
return &_class_data_;

32
src/google/protobuf/descriptor.pb.cc
Unescape View File

@ -2481,6 +2481,7 @@ constexpr ::_pbi::TcParseTable<0, 1, 1, 0, 2> FileDescriptorSet::_table_ = {
const ::google::protobuf::Message::ClassData FileDescriptorSet::_class_data_ = {
FileDescriptorSet::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FileDescriptorSet::GetClassData() const {
return &_class_data_;
@ -3052,6 +3053,7 @@ constexpr ::_pbi::TcParseTable<4, 14, 7, 86, 2> FileDescriptorProto::_table_ = {
const ::google::protobuf::Message::ClassData FileDescriptorProto::_class_data_ = {
FileDescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FileDescriptorProto::GetClassData() const {
return &_class_data_;
@ -3389,6 +3391,7 @@ constexpr ::_pbi::TcParseTable<2, 3, 1, 0, 2> DescriptorProto_ExtensionRange::_t
const ::google::protobuf::Message::ClassData DescriptorProto_ExtensionRange::_class_data_ = {
DescriptorProto_ExtensionRange::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* DescriptorProto_ExtensionRange::GetClassData() const {
return &_class_data_;
@ -3620,6 +3623,7 @@ constexpr ::_pbi::TcParseTable<1, 2, 0, 0, 2> DescriptorProto_ReservedRange::_ta
const ::google::protobuf::Message::ClassData DescriptorProto_ReservedRange::_class_data_ = {
DescriptorProto_ReservedRange::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* DescriptorProto_ReservedRange::GetClassData() const {
return &_class_data_;
@ -4071,6 +4075,7 @@ constexpr ::_pbi::TcParseTable<4, 10, 8, 65, 2> DescriptorProto::_table_ = {
const ::google::protobuf::Message::ClassData DescriptorProto::_class_data_ = {
DescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* DescriptorProto::GetClassData() const {
return &_class_data_;
@ -4439,6 +4444,7 @@ constexpr ::_pbi::TcParseTable<3, 5, 0, 71, 2> ExtensionRangeOptions_Declaration
const ::google::protobuf::Message::ClassData ExtensionRangeOptions_Declaration::_class_data_ = {
ExtensionRangeOptions_Declaration::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* ExtensionRangeOptions_Declaration::GetClassData() const {
return &_class_data_;
@ -4763,6 +4769,7 @@ constexpr ::_pbi::TcParseTable<3, 4, 4, 0, 12> ExtensionRangeOptions::_table_ =
const ::google::protobuf::Message::ClassData ExtensionRangeOptions::_class_data_ = {
ExtensionRangeOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* ExtensionRangeOptions::GetClassData() const {
return &_class_data_;
@ -5293,6 +5300,7 @@ constexpr ::_pbi::TcParseTable<4, 11, 3, 96, 2> FieldDescriptorProto::_table_ =
const ::google::protobuf::Message::ClassData FieldDescriptorProto::_class_data_ = {
FieldDescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FieldDescriptorProto::GetClassData() const {
return &_class_data_;
@ -5592,6 +5600,7 @@ constexpr ::_pbi::TcParseTable<1, 2, 1, 49, 2> OneofDescriptorProto::_table_ = {
const ::google::protobuf::Message::ClassData OneofDescriptorProto::_class_data_ = {
OneofDescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* OneofDescriptorProto::GetClassData() const {
return &_class_data_;
@ -5818,6 +5827,7 @@ constexpr ::_pbi::TcParseTable<1, 2, 0, 0, 2> EnumDescriptorProto_EnumReservedRa
const ::google::protobuf::Message::ClassData EnumDescriptorProto_EnumReservedRange::_class_data_ = {
EnumDescriptorProto_EnumReservedRange::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* EnumDescriptorProto_EnumReservedRange::GetClassData() const {
return &_class_data_;
@ -6146,6 +6156,7 @@ constexpr ::_pbi::TcParseTable<3, 5, 3, 61, 2> EnumDescriptorProto::_table_ = {
const ::google::protobuf::Message::ClassData EnumDescriptorProto::_class_data_ = {
EnumDescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* EnumDescriptorProto::GetClassData() const {
return &_class_data_;
@ -6441,6 +6452,7 @@ constexpr ::_pbi::TcParseTable<2, 3, 1, 53, 2> EnumValueDescriptorProto::_table_
const ::google::protobuf::Message::ClassData EnumValueDescriptorProto::_class_data_ = {
EnumValueDescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* EnumValueDescriptorProto::GetClassData() const {
return &_class_data_;
@ -6730,6 +6742,7 @@ constexpr ::_pbi::TcParseTable<2, 3, 2, 51, 2> ServiceDescriptorProto::_table_ =
const ::google::protobuf::Message::ClassData ServiceDescriptorProto::_class_data_ = {
ServiceDescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* ServiceDescriptorProto::GetClassData() const {
return &_class_data_;
@ -7109,6 +7122,7 @@ constexpr ::_pbi::TcParseTable<3, 6, 1, 71, 2> MethodDescriptorProto::_table_ =
const ::google::protobuf::Message::ClassData MethodDescriptorProto::_class_data_ = {
MethodDescriptorProto::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* MethodDescriptorProto::GetClassData() const {
return &_class_data_;
@ -7938,6 +7952,7 @@ constexpr ::_pbi::TcParseTable<5, 22, 3, 202, 12> FileOptions::_table_ = {
const ::google::protobuf::Message::ClassData FileOptions::_class_data_ = {
FileOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FileOptions::GetClassData() const {
return &_class_data_;
@ -8409,6 +8424,7 @@ constexpr ::_pbi::TcParseTable<3, 7, 2, 0, 7> MessageOptions::_table_ = {
const ::google::protobuf::Message::ClassData MessageOptions::_class_data_ = {
MessageOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* MessageOptions::GetClassData() const {
return &_class_data_;
@ -8707,6 +8723,7 @@ constexpr ::_pbi::TcParseTable<2, 3, 1, 64, 2> FieldOptions_EditionDefault::_tab
const ::google::protobuf::Message::ClassData FieldOptions_EditionDefault::_class_data_ = {
FieldOptions_EditionDefault::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FieldOptions_EditionDefault::GetClassData() const {
return &_class_data_;
@ -9235,6 +9252,7 @@ constexpr ::_pbi::TcParseTable<4, 13, 7, 0, 7> FieldOptions::_table_ = {
const ::google::protobuf::Message::ClassData FieldOptions::_class_data_ = {
FieldOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FieldOptions::GetClassData() const {
return &_class_data_;
@ -9535,6 +9553,7 @@ constexpr ::_pbi::TcParseTable<2, 2, 2, 0, 7> OneofOptions::_table_ = {
const ::google::protobuf::Message::ClassData OneofOptions::_class_data_ = {
OneofOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* OneofOptions::GetClassData() const {
return &_class_data_;
@ -9870,6 +9889,7 @@ constexpr ::_pbi::TcParseTable<3, 5, 2, 0, 7> EnumOptions::_table_ = {
const ::google::protobuf::Message::ClassData EnumOptions::_class_data_ = {
EnumOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* EnumOptions::GetClassData() const {
return &_class_data_;
@ -10205,6 +10225,7 @@ constexpr ::_pbi::TcParseTable<3, 4, 2, 0, 7> EnumValueOptions::_table_ = {
const ::google::protobuf::Message::ClassData EnumValueOptions::_class_data_ = {
EnumValueOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* EnumValueOptions::GetClassData() const {
return &_class_data_;
@ -10506,6 +10527,7 @@ constexpr ::_pbi::TcParseTable<2, 3, 2, 0, 12> ServiceOptions::_table_ = {
const ::google::protobuf::Message::ClassData ServiceOptions::_class_data_ = {
ServiceOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* ServiceOptions::GetClassData() const {
return &_class_data_;
@ -10840,6 +10862,7 @@ constexpr ::_pbi::TcParseTable<3, 4, 3, 0, 12> MethodOptions::_table_ = {
const ::google::protobuf::Message::ClassData MethodOptions::_class_data_ = {
MethodOptions::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* MethodOptions::GetClassData() const {
return &_class_data_;
@ -11098,6 +11121,7 @@ constexpr ::_pbi::TcParseTable<1, 2, 0, 62, 2> UninterpretedOption_NamePart::_ta
const ::google::protobuf::Message::ClassData UninterpretedOption_NamePart::_class_data_ = {
UninterpretedOption_NamePart::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* UninterpretedOption_NamePart::GetClassData() const {
return &_class_data_;
@ -11480,6 +11504,7 @@ constexpr ::_pbi::TcParseTable<3, 7, 1, 75, 2> UninterpretedOption::_table_ = {
const ::google::protobuf::Message::ClassData UninterpretedOption::_class_data_ = {
UninterpretedOption::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* UninterpretedOption::GetClassData() const {
return &_class_data_;
@ -11831,6 +11856,7 @@ constexpr ::_pbi::TcParseTable<3, 5, 5, 0, 2> FeatureSet::_table_ = {
const ::google::protobuf::Message::ClassData FeatureSet::_class_data_ = {
FeatureSet::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FeatureSet::GetClassData() const {
return &_class_data_;
@ -12129,6 +12155,7 @@ constexpr ::_pbi::TcParseTable<2, 3, 2, 75, 2> FeatureSetDefaults_FeatureSetEdit
const ::google::protobuf::Message::ClassData FeatureSetDefaults_FeatureSetEditionDefault::_class_data_ = {
FeatureSetDefaults_FeatureSetEditionDefault::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FeatureSetDefaults_FeatureSetEditionDefault::GetClassData() const {
return &_class_data_;
@ -12476,6 +12503,7 @@ constexpr ::_pbi::TcParseTable<3, 5, 3, 73, 2> FeatureSetDefaults::_table_ = {
const ::google::protobuf::Message::ClassData FeatureSetDefaults::_class_data_ = {
FeatureSetDefaults::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* FeatureSetDefaults::GetClassData() const {
return &_class_data_;
@ -12832,6 +12860,7 @@ constexpr ::_pbi::TcParseTable<3, 5, 0, 106, 2> SourceCodeInfo_Location::_table_
const ::google::protobuf::Message::ClassData SourceCodeInfo_Location::_class_data_ = {
SourceCodeInfo_Location::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* SourceCodeInfo_Location::GetClassData() const {
return &_class_data_;
@ -13032,6 +13061,7 @@ constexpr ::_pbi::TcParseTable<0, 1, 1, 0, 2> SourceCodeInfo::_table_ = {
const ::google::protobuf::Message::ClassData SourceCodeInfo::_class_data_ = {
SourceCodeInfo::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* SourceCodeInfo::GetClassData() const {
return &_class_data_;
@ -13352,6 +13382,7 @@ constexpr ::_pbi::TcParseTable<3, 5, 1, 64, 2> GeneratedCodeInfo_Annotation::_ta
const ::google::protobuf::Message::ClassData GeneratedCodeInfo_Annotation::_class_data_ = {
GeneratedCodeInfo_Annotation::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* GeneratedCodeInfo_Annotation::GetClassData() const {
return &_class_data_;
@ -13559,6 +13590,7 @@ constexpr ::_pbi::TcParseTable<0, 1, 1, 0, 2> GeneratedCodeInfo::_table_ = {
const ::google::protobuf::Message::ClassData GeneratedCodeInfo::_class_data_ = {
GeneratedCodeInfo::MergeImpl,
nullptr, // OnDemandRegisterArenaDtor
};
const ::google::protobuf::Message::ClassData* GeneratedCodeInfo::GetClassData() const {
return &_class_data_;

3
src/google/protobuf/message.cc
Unescape View File

@ -99,9 +99,6 @@ void Message::CopyFrom(const Message& from) {
}
}
void Message::CopyWithSourceCheck(Message& to, const Message& from) {
}
std::string Message::GetTypeName() const {
return GetDescriptor()->full_name();
}

19
src/google/protobuf/message.h
Unescape View File

@ -362,25 +362,6 @@ class PROTOBUF_EXPORT Message : public MessageLite {
// to implement GetDescriptor() and GetReflection() above.
virtual Metadata GetMetadata() const = 0;
struct ClassData {
// Note: The order of arguments (to, then from) is chosen so that the ABI
// of this function is the same as the MergeFrom method. That is, the
// hidden "this" parameter comes first.
void (*merge_to_from)(Message& to, const Message& from_msg);
};
// GetClassData() returns a pointer to a ClassData struct which
// exists in global memory and is unique to each subclass. This uniqueness
// property is used in order to quickly determine whether two messages are
// of the same type.
// TODO(jorg): change to pure virtual
virtual const ClassData* GetClassData() const { return nullptr; }
// CopyWithSourceCheck calls Clear() and then MergeFrom(), and in debug
// builds, checks that calling Clear() on the destination message doesn't
// alter the source. It assumes the messages are known to be of the same
// type, and thus uses GetClassData().
static void CopyWithSourceCheck(Message& to, const Message& from);
inline explicit Message(Arena* arena) : MessageLite(arena) {}
size_t ComputeUnknownFieldsSize(size_t total_size,
internal::CachedSize* cached_size) const;

12
src/google/protobuf/message_lite.cc
Unescape View File

@ -44,6 +44,18 @@
namespace google {
namespace protobuf {
void MessageLite::OnDemandRegisterArenaDtor(Arena* arena) {
if (arena == nullptr) return;
auto* data = GetClassData();
if (data != nullptr && data->on_demand_register_arena_dtor != nullptr) {
data->on_demand_register_arena_dtor(*this, *arena);
}
}
const MessageLite::ClassData* MessageLite::GetClassData() const {
return nullptr;
}
std::string MessageLite::InitializationErrorString() const {
return "(cannot determine missing fields for lite message)";
}

19
src/google/protobuf/message_lite.h
Unescape View File

@ -492,7 +492,7 @@ class PROTOBUF_EXPORT MessageLite {
return nullptr;
}
virtual void OnDemandRegisterArenaDtor(Arena* /*arena*/) {}
void OnDemandRegisterArenaDtor(Arena* arena);
protected:
// Message implementations require access to internally visible API.
@ -525,6 +525,23 @@ class PROTOBUF_EXPORT MessageLite {
// messages, etc), or owning incoming objects (e.g., set allocated).
Arena* GetArenaForAllocation() const { return _internal_metadata_.arena(); }
struct ClassData {
// Note: The order of arguments in the functions is chosen so that it has
// the same ABI as the member function that calls them. Eg the `this`
// pointer becomes the first argument in the free function.
void (*merge_to_from)(Message& to, const Message& from_msg);
void (*on_demand_register_arena_dtor)(MessageLite& msg, Arena& arena);
};
// GetClassData() returns a pointer to a ClassData struct which
// exists in global memory and is unique to each subclass. This uniqueness
// property is used in order to quickly determine whether two messages are
// of the same type.
//
// This is a work in progress. Currently only SPEED messages return an
// instance. In the future all message types will return one.
virtual const ClassData* GetClassData() const;
internal::InternalMetadata _internal_metadata_;
// The default implementation means there is no cached size and ByteSize

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