Joe Tsai 82760ceffa internal/impl: add MessageState to every generated message
We define MessageState, which is essentially an atomically set *MessageInfo.
By nesting this as the first field in every generated message, we can
implement the reflective methods on a *MessageState when obtained by
unsafe casting a concrete message pointer as a *MessageState.
The MessageInfo held by MessageState provides additional Go type information
to interpret the memory that comes after the contents of the MessageState.

Since we are nesting a MessageState in every message,
the memory use of every message instance grows by 8B.

On average, the body of ProtoReflect grows from 133B to 202B (+50%).
However, this is offset by XXX_Methods, which is 108B and
will be removed in a future CL. Taking into account the eventual removal
of XXX_Methods, this is a net reduction of 25%.

name          old time/op    new time/op    delta
Name/Value-4    70.3ns ± 2%    17.5ns ± 6%   -75.08%  (p=0.000 n=10+10)
Name/Nil-4      70.6ns ± 3%    33.4ns ± 2%   -52.66%  (p=0.000 n=10+10)

name          old alloc/op   new alloc/op   delta
Name/Value-4     16.0B ± 0%      0.0B       -100.00%  (p=0.000 n=10+10)
Name/Nil-4       16.0B ± 0%      0.0B       -100.00%  (p=0.000 n=10+10)

name          old allocs/op  new allocs/op  delta
Name/Value-4      1.00 ± 0%      0.00       -100.00%  (p=0.000 n=10+10)
Name/Nil-4        1.00 ± 0%      0.00       -100.00%  (p=0.000 n=10+10)

Change-Id: I92bd58dc681c57c92612fd5ba7fc066aea34e95a
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/185460
Reviewed-by: Damien Neil <dneil@google.com>
2019-07-10 19:44:24 +00:00

129 lines
3.9 KiB
Go

// Code generated by protoc-gen-go. DO NOT EDIT.
// source: imports/fmt/m.proto
package fmt
import (
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
protoiface "google.golang.org/protobuf/runtime/protoiface"
protoimpl "google.golang.org/protobuf/runtime/protoimpl"
sync "sync"
)
const (
// Verify that runtime/protoimpl is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 0)
// Verify that this generated code is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(0 - protoimpl.MinVersion)
)
type M struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
}
func (x *M) Reset() {
*x = M{}
}
func (x *M) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*M) ProtoMessage() {}
func (x *M) ProtoReflect() protoreflect.Message {
mi := &file_imports_fmt_m_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
func (x *M) XXX_Methods() *protoiface.Methods {
return file_imports_fmt_m_proto_msgTypes[0].Methods()
}
// Deprecated: Use M.ProtoReflect.Type instead.
func (*M) Descriptor() ([]byte, []int) {
return file_imports_fmt_m_proto_rawDescGZIP(), []int{0}
}
var File_imports_fmt_m_proto protoreflect.FileDescriptor
var file_imports_fmt_m_proto_rawDesc = []byte{
0x0a, 0x13, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x73, 0x2f, 0x66, 0x6d, 0x74, 0x2f, 0x6d, 0x2e,
0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x03, 0x66, 0x6d, 0x74, 0x22, 0x03, 0x0a, 0x01, 0x4d, 0x42,
0x43, 0x5a, 0x41, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67,
0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x63, 0x6d,
0x64, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2d, 0x67, 0x65, 0x6e, 0x2d, 0x67, 0x6f, 0x2f,
0x74, 0x65, 0x73, 0x74, 0x64, 0x61, 0x74, 0x61, 0x2f, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x73,
0x2f, 0x66, 0x6d, 0x74, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
}
var (
file_imports_fmt_m_proto_rawDescOnce sync.Once
file_imports_fmt_m_proto_rawDescData = file_imports_fmt_m_proto_rawDesc
)
func file_imports_fmt_m_proto_rawDescGZIP() []byte {
file_imports_fmt_m_proto_rawDescOnce.Do(func() {
file_imports_fmt_m_proto_rawDescData = protoimpl.X.CompressGZIP(file_imports_fmt_m_proto_rawDescData)
})
return file_imports_fmt_m_proto_rawDescData
}
var file_imports_fmt_m_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
var file_imports_fmt_m_proto_goTypes = []interface{}{
(*M)(nil), // 0: fmt.M
}
var file_imports_fmt_m_proto_depIdxs = []int32{
0, // starting offset of method output_type sub-list
0, // starting offset of method input_type sub-list
0, // starting offset of extension type_name sub-list
0, // starting offset of extension extendee sub-list
0, // starting offset of field type_name sub-list
}
func init() { file_imports_fmt_m_proto_init() }
func file_imports_fmt_m_proto_init() {
if File_imports_fmt_m_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_imports_fmt_m_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*M); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
out := protoimpl.TypeBuilder{
File: protoimpl.DescBuilder{
RawDescriptor: file_imports_fmt_m_proto_rawDesc,
NumEnums: 0,
NumMessages: 1,
NumExtensions: 0,
NumServices: 0,
},
GoTypes: file_imports_fmt_m_proto_goTypes,
DependencyIndexes: file_imports_fmt_m_proto_depIdxs,
MessageInfos: file_imports_fmt_m_proto_msgTypes,
}.Build()
File_imports_fmt_m_proto = out.File
file_imports_fmt_m_proto_rawDesc = nil
file_imports_fmt_m_proto_goTypes = nil
file_imports_fmt_m_proto_depIdxs = nil
}