forked from toolshed/abra
599 lines
17 KiB
Go
599 lines
17 KiB
Go
// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package impl
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import (
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"fmt"
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"math"
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"reflect"
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"strings"
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"sync/atomic"
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"google.golang.org/protobuf/internal/filedesc"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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type opaqueStructInfo struct {
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structInfo
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}
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// isOpaque determines whether a protobuf message type is on the Opaque API. It
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// checks whether the type is a Go struct that protoc-gen-go would generate.
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//
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// This function only detects newly generated messages from the v2
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// implementation of protoc-gen-go. It is unable to classify generated messages
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// that are too old or those that are generated by a different generator
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// such as protoc-gen-gogo.
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func isOpaque(t reflect.Type) bool {
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// The current detection mechanism is to simply check the first field
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// for a struct tag with the "protogen" key.
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if t.Kind() == reflect.Struct && t.NumField() > 0 {
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pgt := t.Field(0).Tag.Get("protogen")
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return strings.HasPrefix(pgt, "opaque.")
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}
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return false
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}
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func opaqueInitHook(mi *MessageInfo) bool {
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mt := mi.GoReflectType.Elem()
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si := opaqueStructInfo{
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structInfo: mi.makeStructInfo(mt),
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}
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if !isOpaque(mt) {
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return false
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}
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defer atomic.StoreUint32(&mi.initDone, 1)
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mi.fields = map[protoreflect.FieldNumber]*fieldInfo{}
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fds := mi.Desc.Fields()
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for i := 0; i < fds.Len(); i++ {
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fd := fds.Get(i)
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fs := si.fieldsByNumber[fd.Number()]
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var fi fieldInfo
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usePresence, _ := filedesc.UsePresenceForField(fd)
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switch {
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case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
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// Oneofs are no different for opaque.
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fi = fieldInfoForOneof(fd, si.oneofsByName[fd.ContainingOneof().Name()], mi.Exporter, si.oneofWrappersByNumber[fd.Number()])
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case fd.IsMap():
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fi = mi.fieldInfoForMapOpaque(si, fd, fs)
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case fd.IsList() && fd.Message() == nil && usePresence:
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fi = mi.fieldInfoForScalarListOpaque(si, fd, fs)
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case fd.IsList() && fd.Message() == nil:
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// Proto3 lists without presence can use same access methods as open
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fi = fieldInfoForList(fd, fs, mi.Exporter)
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case fd.IsList() && usePresence:
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fi = mi.fieldInfoForMessageListOpaque(si, fd, fs)
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case fd.IsList():
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// Proto3 opaque messages that does not need presence bitmap.
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// Different representation than open struct, but same logic
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fi = mi.fieldInfoForMessageListOpaqueNoPresence(si, fd, fs)
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case fd.Message() != nil && usePresence:
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fi = mi.fieldInfoForMessageOpaque(si, fd, fs)
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case fd.Message() != nil:
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// Proto3 messages without presence can use same access methods as open
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fi = fieldInfoForMessage(fd, fs, mi.Exporter)
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default:
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fi = mi.fieldInfoForScalarOpaque(si, fd, fs)
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}
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mi.fields[fd.Number()] = &fi
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}
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mi.oneofs = map[protoreflect.Name]*oneofInfo{}
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for i := 0; i < mi.Desc.Oneofs().Len(); i++ {
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od := mi.Desc.Oneofs().Get(i)
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mi.oneofs[od.Name()] = makeOneofInfoOpaque(mi, od, si.structInfo, mi.Exporter)
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}
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mi.denseFields = make([]*fieldInfo, fds.Len()*2)
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for i := 0; i < fds.Len(); i++ {
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if fd := fds.Get(i); int(fd.Number()) < len(mi.denseFields) {
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mi.denseFields[fd.Number()] = mi.fields[fd.Number()]
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}
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}
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for i := 0; i < fds.Len(); {
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fd := fds.Get(i)
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if od := fd.ContainingOneof(); od != nil && !fd.ContainingOneof().IsSynthetic() {
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mi.rangeInfos = append(mi.rangeInfos, mi.oneofs[od.Name()])
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i += od.Fields().Len()
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} else {
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mi.rangeInfos = append(mi.rangeInfos, mi.fields[fd.Number()])
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i++
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}
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}
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mi.makeExtensionFieldsFunc(mt, si.structInfo)
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mi.makeUnknownFieldsFunc(mt, si.structInfo)
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mi.makeOpaqueCoderMethods(mt, si)
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mi.makeFieldTypes(si.structInfo)
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return true
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}
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func makeOneofInfoOpaque(mi *MessageInfo, od protoreflect.OneofDescriptor, si structInfo, x exporter) *oneofInfo {
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oi := &oneofInfo{oneofDesc: od}
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if od.IsSynthetic() {
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fd := od.Fields().Get(0)
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index, _ := presenceIndex(mi.Desc, fd)
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oi.which = func(p pointer) protoreflect.FieldNumber {
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if p.IsNil() {
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return 0
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}
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if !mi.present(p, index) {
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return 0
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}
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return od.Fields().Get(0).Number()
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}
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return oi
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}
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// Dispatch to non-opaque oneof implementation for non-synthetic oneofs.
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return makeOneofInfo(od, si, x)
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}
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func (mi *MessageInfo) fieldInfoForMapOpaque(si opaqueStructInfo, fd protoreflect.FieldDescriptor, fs reflect.StructField) fieldInfo {
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ft := fs.Type
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if ft.Kind() != reflect.Map {
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panic(fmt.Sprintf("invalid type: got %v, want map kind", ft))
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}
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fieldOffset := offsetOf(fs)
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conv := NewConverter(ft, fd)
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return fieldInfo{
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fieldDesc: fd,
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has: func(p pointer) bool {
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if p.IsNil() {
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return false
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}
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// Don't bother checking presence bits, since we need to
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// look at the map length even if the presence bit is set.
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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return rv.Len() > 0
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},
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clear: func(p pointer) {
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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rv.Set(reflect.Zero(rv.Type()))
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},
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get: func(p pointer) protoreflect.Value {
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if p.IsNil() {
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return conv.Zero()
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}
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if rv.Len() == 0 {
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return conv.Zero()
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}
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return conv.PBValueOf(rv)
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},
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set: func(p pointer, v protoreflect.Value) {
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pv := conv.GoValueOf(v)
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if pv.IsNil() {
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panic(fmt.Sprintf("invalid value: setting map field to read-only value"))
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}
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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rv.Set(pv)
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},
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mutable: func(p pointer) protoreflect.Value {
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v := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if v.IsNil() {
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v.Set(reflect.MakeMap(fs.Type))
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}
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return conv.PBValueOf(v)
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},
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newField: func() protoreflect.Value {
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return conv.New()
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},
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}
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}
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func (mi *MessageInfo) fieldInfoForScalarListOpaque(si opaqueStructInfo, fd protoreflect.FieldDescriptor, fs reflect.StructField) fieldInfo {
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ft := fs.Type
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if ft.Kind() != reflect.Slice {
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panic(fmt.Sprintf("invalid type: got %v, want slice kind", ft))
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}
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conv := NewConverter(reflect.PtrTo(ft), fd)
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fieldOffset := offsetOf(fs)
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index, _ := presenceIndex(mi.Desc, fd)
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return fieldInfo{
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fieldDesc: fd,
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has: func(p pointer) bool {
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if p.IsNil() {
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return false
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}
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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return rv.Len() > 0
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},
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clear: func(p pointer) {
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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rv.Set(reflect.Zero(rv.Type()))
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},
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get: func(p pointer) protoreflect.Value {
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if p.IsNil() {
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return conv.Zero()
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}
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type)
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if rv.Elem().Len() == 0 {
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return conv.Zero()
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}
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return conv.PBValueOf(rv)
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},
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set: func(p pointer, v protoreflect.Value) {
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pv := conv.GoValueOf(v)
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if pv.IsNil() {
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panic(fmt.Sprintf("invalid value: setting repeated field to read-only value"))
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}
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mi.setPresent(p, index)
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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rv.Set(pv.Elem())
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},
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mutable: func(p pointer) protoreflect.Value {
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mi.setPresent(p, index)
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return conv.PBValueOf(p.Apply(fieldOffset).AsValueOf(fs.Type))
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},
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newField: func() protoreflect.Value {
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return conv.New()
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},
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}
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}
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func (mi *MessageInfo) fieldInfoForMessageListOpaque(si opaqueStructInfo, fd protoreflect.FieldDescriptor, fs reflect.StructField) fieldInfo {
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ft := fs.Type
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if ft.Kind() != reflect.Ptr || ft.Elem().Kind() != reflect.Slice {
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panic(fmt.Sprintf("invalid type: got %v, want slice kind", ft))
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}
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conv := NewConverter(ft, fd)
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fieldOffset := offsetOf(fs)
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index, _ := presenceIndex(mi.Desc, fd)
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fieldNumber := fd.Number()
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return fieldInfo{
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fieldDesc: fd,
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has: func(p pointer) bool {
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if p.IsNil() {
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return false
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}
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if !mi.present(p, index) {
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return false
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}
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sp := p.Apply(fieldOffset).AtomicGetPointer()
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if sp.IsNil() {
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// Lazily unmarshal this field.
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mi.lazyUnmarshal(p, fieldNumber)
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sp = p.Apply(fieldOffset).AtomicGetPointer()
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}
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rv := sp.AsValueOf(fs.Type.Elem())
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return rv.Elem().Len() > 0
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},
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clear: func(p pointer) {
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fp := p.Apply(fieldOffset)
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sp := fp.AtomicGetPointer()
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if sp.IsNil() {
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sp = fp.AtomicSetPointerIfNil(pointerOfValue(reflect.New(fs.Type.Elem())))
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mi.setPresent(p, index)
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}
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rv := sp.AsValueOf(fs.Type.Elem())
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rv.Elem().Set(reflect.Zero(rv.Type().Elem()))
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},
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get: func(p pointer) protoreflect.Value {
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if p.IsNil() {
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return conv.Zero()
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}
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if !mi.present(p, index) {
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return conv.Zero()
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}
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sp := p.Apply(fieldOffset).AtomicGetPointer()
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if sp.IsNil() {
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// Lazily unmarshal this field.
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mi.lazyUnmarshal(p, fieldNumber)
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sp = p.Apply(fieldOffset).AtomicGetPointer()
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}
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rv := sp.AsValueOf(fs.Type.Elem())
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if rv.Elem().Len() == 0 {
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return conv.Zero()
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}
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return conv.PBValueOf(rv)
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},
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set: func(p pointer, v protoreflect.Value) {
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fp := p.Apply(fieldOffset)
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sp := fp.AtomicGetPointer()
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if sp.IsNil() {
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sp = fp.AtomicSetPointerIfNil(pointerOfValue(reflect.New(fs.Type.Elem())))
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mi.setPresent(p, index)
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}
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rv := sp.AsValueOf(fs.Type.Elem())
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val := conv.GoValueOf(v)
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if val.IsNil() {
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panic(fmt.Sprintf("invalid value: setting repeated field to read-only value"))
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} else {
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rv.Elem().Set(val.Elem())
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}
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},
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mutable: func(p pointer) protoreflect.Value {
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fp := p.Apply(fieldOffset)
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sp := fp.AtomicGetPointer()
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if sp.IsNil() {
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if mi.present(p, index) {
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// Lazily unmarshal this field.
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mi.lazyUnmarshal(p, fieldNumber)
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sp = p.Apply(fieldOffset).AtomicGetPointer()
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} else {
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sp = fp.AtomicSetPointerIfNil(pointerOfValue(reflect.New(fs.Type.Elem())))
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mi.setPresent(p, index)
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}
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}
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rv := sp.AsValueOf(fs.Type.Elem())
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return conv.PBValueOf(rv)
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},
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newField: func() protoreflect.Value {
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return conv.New()
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},
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}
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}
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func (mi *MessageInfo) fieldInfoForMessageListOpaqueNoPresence(si opaqueStructInfo, fd protoreflect.FieldDescriptor, fs reflect.StructField) fieldInfo {
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ft := fs.Type
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if ft.Kind() != reflect.Ptr || ft.Elem().Kind() != reflect.Slice {
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panic(fmt.Sprintf("invalid type: got %v, want slice kind", ft))
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}
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conv := NewConverter(ft, fd)
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fieldOffset := offsetOf(fs)
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return fieldInfo{
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fieldDesc: fd,
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has: func(p pointer) bool {
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if p.IsNil() {
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return false
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}
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if rv.IsNil() {
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return false
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}
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return rv.Elem().Len() > 0
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},
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clear: func(p pointer) {
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if !rv.IsNil() {
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rv.Elem().Set(reflect.Zero(rv.Type().Elem()))
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}
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},
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get: func(p pointer) protoreflect.Value {
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if p.IsNil() {
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return conv.Zero()
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}
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if rv.IsNil() {
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return conv.Zero()
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}
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if rv.Elem().Len() == 0 {
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return conv.Zero()
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}
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return conv.PBValueOf(rv)
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},
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set: func(p pointer, v protoreflect.Value) {
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if rv.IsNil() {
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rv.Set(reflect.New(fs.Type.Elem()))
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}
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val := conv.GoValueOf(v)
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if val.IsNil() {
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panic(fmt.Sprintf("invalid value: setting repeated field to read-only value"))
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} else {
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rv.Elem().Set(val.Elem())
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}
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},
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mutable: func(p pointer) protoreflect.Value {
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if rv.IsNil() {
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rv.Set(reflect.New(fs.Type.Elem()))
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}
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return conv.PBValueOf(rv)
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},
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newField: func() protoreflect.Value {
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return conv.New()
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},
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}
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}
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func (mi *MessageInfo) fieldInfoForScalarOpaque(si opaqueStructInfo, fd protoreflect.FieldDescriptor, fs reflect.StructField) fieldInfo {
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ft := fs.Type
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nullable := fd.HasPresence()
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if oneof := fd.ContainingOneof(); oneof != nil && oneof.IsSynthetic() {
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nullable = true
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}
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deref := false
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if nullable && ft.Kind() == reflect.Ptr {
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ft = ft.Elem()
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deref = true
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}
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conv := NewConverter(ft, fd)
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fieldOffset := offsetOf(fs)
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index, _ := presenceIndex(mi.Desc, fd)
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var getter func(p pointer) protoreflect.Value
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if !nullable {
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getter = getterForDirectScalar(fd, fs, conv, fieldOffset)
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} else {
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getter = getterForOpaqueNullableScalar(mi, index, fd, fs, conv, fieldOffset)
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}
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return fieldInfo{
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fieldDesc: fd,
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has: func(p pointer) bool {
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if p.IsNil() {
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return false
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}
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if nullable {
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return mi.present(p, index)
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}
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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switch rv.Kind() {
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case reflect.Bool:
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return rv.Bool()
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case reflect.Int32, reflect.Int64:
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return rv.Int() != 0
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case reflect.Uint32, reflect.Uint64:
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return rv.Uint() != 0
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case reflect.Float32, reflect.Float64:
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return rv.Float() != 0 || math.Signbit(rv.Float())
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case reflect.String, reflect.Slice:
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return rv.Len() > 0
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default:
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panic(fmt.Sprintf("invalid type: %v", rv.Type())) // should never happen
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}
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},
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clear: func(p pointer) {
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if nullable {
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mi.clearPresent(p, index)
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}
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// This is only valuable for bytes and strings, but we do it unconditionally.
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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rv.Set(reflect.Zero(rv.Type()))
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},
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get: getter,
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// TODO: Implement unsafe fast path for set?
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set: func(p pointer, v protoreflect.Value) {
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rv := p.Apply(fieldOffset).AsValueOf(fs.Type).Elem()
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if deref {
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if rv.IsNil() {
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rv.Set(reflect.New(ft))
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}
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rv = rv.Elem()
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}
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rv.Set(conv.GoValueOf(v))
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if nullable && rv.Kind() == reflect.Slice && rv.IsNil() {
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rv.Set(emptyBytes)
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}
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if nullable {
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mi.setPresent(p, index)
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}
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},
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newField: func() protoreflect.Value {
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return conv.New()
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},
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}
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}
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func (mi *MessageInfo) fieldInfoForMessageOpaque(si opaqueStructInfo, fd protoreflect.FieldDescriptor, fs reflect.StructField) fieldInfo {
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ft := fs.Type
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conv := NewConverter(ft, fd)
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fieldOffset := offsetOf(fs)
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index, _ := presenceIndex(mi.Desc, fd)
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fieldNumber := fd.Number()
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elemType := fs.Type.Elem()
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return fieldInfo{
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fieldDesc: fd,
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has: func(p pointer) bool {
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if p.IsNil() {
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return false
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}
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return mi.present(p, index)
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},
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clear: func(p pointer) {
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mi.clearPresent(p, index)
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p.Apply(fieldOffset).AtomicSetNilPointer()
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},
|
|
get: func(p pointer) protoreflect.Value {
|
|
if p.IsNil() || !mi.present(p, index) {
|
|
return conv.Zero()
|
|
}
|
|
fp := p.Apply(fieldOffset)
|
|
mp := fp.AtomicGetPointer()
|
|
if mp.IsNil() {
|
|
// Lazily unmarshal this field.
|
|
mi.lazyUnmarshal(p, fieldNumber)
|
|
mp = fp.AtomicGetPointer()
|
|
}
|
|
rv := mp.AsValueOf(elemType)
|
|
return conv.PBValueOf(rv)
|
|
},
|
|
set: func(p pointer, v protoreflect.Value) {
|
|
val := pointerOfValue(conv.GoValueOf(v))
|
|
if val.IsNil() {
|
|
panic("invalid nil pointer")
|
|
}
|
|
p.Apply(fieldOffset).AtomicSetPointer(val)
|
|
mi.setPresent(p, index)
|
|
},
|
|
mutable: func(p pointer) protoreflect.Value {
|
|
fp := p.Apply(fieldOffset)
|
|
mp := fp.AtomicGetPointer()
|
|
if mp.IsNil() {
|
|
if mi.present(p, index) {
|
|
// Lazily unmarshal this field.
|
|
mi.lazyUnmarshal(p, fieldNumber)
|
|
mp = fp.AtomicGetPointer()
|
|
} else {
|
|
mp = pointerOfValue(conv.GoValueOf(conv.New()))
|
|
fp.AtomicSetPointer(mp)
|
|
mi.setPresent(p, index)
|
|
}
|
|
}
|
|
return conv.PBValueOf(mp.AsValueOf(fs.Type.Elem()))
|
|
},
|
|
newMessage: func() protoreflect.Message {
|
|
return conv.New().Message()
|
|
},
|
|
newField: func() protoreflect.Value {
|
|
return conv.New()
|
|
},
|
|
}
|
|
}
|
|
|
|
// A presenceList wraps a List, updating presence bits as necessary when the
|
|
// list contents change.
|
|
type presenceList struct {
|
|
pvalueList
|
|
setPresence func(bool)
|
|
}
|
|
type pvalueList interface {
|
|
protoreflect.List
|
|
//Unwrapper
|
|
}
|
|
|
|
func (list presenceList) Append(v protoreflect.Value) {
|
|
list.pvalueList.Append(v)
|
|
list.setPresence(true)
|
|
}
|
|
func (list presenceList) Truncate(i int) {
|
|
list.pvalueList.Truncate(i)
|
|
list.setPresence(i > 0)
|
|
}
|
|
|
|
// presenceIndex returns the index to pass to presence functions.
|
|
//
|
|
// TODO: field.Desc.Index() would be simpler, and would give space to record the presence of oneof fields.
|
|
func presenceIndex(md protoreflect.MessageDescriptor, fd protoreflect.FieldDescriptor) (uint32, presenceSize) {
|
|
found := false
|
|
var index, numIndices uint32
|
|
for i := 0; i < md.Fields().Len(); i++ {
|
|
f := md.Fields().Get(i)
|
|
if f == fd {
|
|
found = true
|
|
index = numIndices
|
|
}
|
|
if f.ContainingOneof() == nil || isLastOneofField(f) {
|
|
numIndices++
|
|
}
|
|
}
|
|
if !found {
|
|
panic(fmt.Sprintf("BUG: %v not in %v", fd.Name(), md.FullName()))
|
|
}
|
|
return index, presenceSize(numIndices)
|
|
}
|
|
|
|
func isLastOneofField(fd protoreflect.FieldDescriptor) bool {
|
|
fields := fd.ContainingOneof().Fields()
|
|
return fields.Get(fields.Len()-1) == fd
|
|
}
|
|
|
|
func (mi *MessageInfo) setPresent(p pointer, index uint32) {
|
|
p.Apply(mi.presenceOffset).PresenceInfo().SetPresent(index, mi.presenceSize)
|
|
}
|
|
|
|
func (mi *MessageInfo) clearPresent(p pointer, index uint32) {
|
|
p.Apply(mi.presenceOffset).PresenceInfo().ClearPresent(index)
|
|
}
|
|
|
|
func (mi *MessageInfo) present(p pointer, index uint32) bool {
|
|
return p.Apply(mi.presenceOffset).PresenceInfo().Present(index)
|
|
}
|