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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package impl
import (
"fmt"
"reflect"
"sort"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/internal/encoding/messageset"
"google.golang.org/protobuf/internal/order"
"google.golang.org/protobuf/reflect/protoreflect"
piface "google.golang.org/protobuf/runtime/protoiface"
)
func (mi *MessageInfo) makeOpaqueCoderMethods(t reflect.Type, si opaqueStructInfo) {
mi.sizecacheOffset = si.sizecacheOffset
mi.unknownOffset = si.unknownOffset
mi.unknownPtrKind = si.unknownType.Kind() == reflect.Ptr
mi.extensionOffset = si.extensionOffset
mi.lazyOffset = si.lazyOffset
mi.presenceOffset = si.presenceOffset
mi.coderFields = make(map[protowire.Number]*coderFieldInfo)
fields := mi.Desc.Fields()
for i := 0; i < fields.Len(); i++ {
fd := fields.Get(i)
fs := si.fieldsByNumber[fd.Number()]
if fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic() {
fs = si.oneofsByName[fd.ContainingOneof().Name()]
}
ft := fs.Type
var wiretag uint64
if !fd.IsPacked() {
wiretag = protowire.EncodeTag(fd.Number(), wireTypes[fd.Kind()])
} else {
wiretag = protowire.EncodeTag(fd.Number(), protowire.BytesType)
}
var fieldOffset offset
var funcs pointerCoderFuncs
var childMessage *MessageInfo
switch {
case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
fieldOffset = offsetOf(fs)
case fd.Message() != nil && !fd.IsMap():
fieldOffset = offsetOf(fs)
if fd.IsList() {
childMessage, funcs = makeOpaqueRepeatedMessageFieldCoder(fd, ft)
} else {
childMessage, funcs = makeOpaqueMessageFieldCoder(fd, ft)
}
default:
fieldOffset = offsetOf(fs)
childMessage, funcs = fieldCoder(fd, ft)
}
cf := &coderFieldInfo{
num: fd.Number(),
offset: fieldOffset,
wiretag: wiretag,
ft: ft,
tagsize: protowire.SizeVarint(wiretag),
funcs: funcs,
mi: childMessage,
validation: newFieldValidationInfo(mi, si.structInfo, fd, ft),
isPointer: (fd.Cardinality() == protoreflect.Repeated ||
fd.Kind() == protoreflect.MessageKind ||
fd.Kind() == protoreflect.GroupKind),
isRequired: fd.Cardinality() == protoreflect.Required,
presenceIndex: noPresence,
}
// TODO: Use presence for all fields.
//
// In some cases, such as maps, presence means only "might be set" rather
// than "is definitely set", but every field should have a presence bit to
// permit us to skip over definitely-unset fields at marshal time.
var hasPresence bool
hasPresence, cf.isLazy = usePresenceForField(si, fd)
if hasPresence {
cf.presenceIndex, mi.presenceSize = presenceIndex(mi.Desc, fd)
}
mi.orderedCoderFields = append(mi.orderedCoderFields, cf)
mi.coderFields[cf.num] = cf
}
for i, oneofs := 0, mi.Desc.Oneofs(); i < oneofs.Len(); i++ {
if od := oneofs.Get(i); !od.IsSynthetic() {
mi.initOneofFieldCoders(od, si.structInfo)
}
}
if messageset.IsMessageSet(mi.Desc) {
if !mi.extensionOffset.IsValid() {
panic(fmt.Sprintf("%v: MessageSet with no extensions field", mi.Desc.FullName()))
}
if !mi.unknownOffset.IsValid() {
panic(fmt.Sprintf("%v: MessageSet with no unknown field", mi.Desc.FullName()))
}
mi.isMessageSet = true
}
sort.Slice(mi.orderedCoderFields, func(i, j int) bool {
return mi.orderedCoderFields[i].num < mi.orderedCoderFields[j].num
})
var maxDense protoreflect.FieldNumber
for _, cf := range mi.orderedCoderFields {
if cf.num >= 16 && cf.num >= 2*maxDense {
break
}
maxDense = cf.num
}
mi.denseCoderFields = make([]*coderFieldInfo, maxDense+1)
for _, cf := range mi.orderedCoderFields {
if int(cf.num) > len(mi.denseCoderFields) {
break
}
mi.denseCoderFields[cf.num] = cf
}
// To preserve compatibility with historic wire output, marshal oneofs last.
if mi.Desc.Oneofs().Len() > 0 {
sort.Slice(mi.orderedCoderFields, func(i, j int) bool {
fi := fields.ByNumber(mi.orderedCoderFields[i].num)
fj := fields.ByNumber(mi.orderedCoderFields[j].num)
return order.LegacyFieldOrder(fi, fj)
})
}
mi.needsInitCheck = needsInitCheck(mi.Desc)
if mi.methods.Marshal == nil && mi.methods.Size == nil {
mi.methods.Flags |= piface.SupportMarshalDeterministic
mi.methods.Marshal = mi.marshal
mi.methods.Size = mi.size
}
if mi.methods.Unmarshal == nil {
mi.methods.Flags |= piface.SupportUnmarshalDiscardUnknown
mi.methods.Unmarshal = mi.unmarshal
}
if mi.methods.CheckInitialized == nil {
mi.methods.CheckInitialized = mi.checkInitialized
}
if mi.methods.Merge == nil {
mi.methods.Merge = mi.merge
}
if mi.methods.Equal == nil {
mi.methods.Equal = equal
}
}
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