218 lines
7.0 KiB
Go
218 lines
7.0 KiB
Go
// Copyright 2019 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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"reflect"
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"sort"
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"google.golang.org/protobuf/encoding/protowire"
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"google.golang.org/protobuf/internal/encoding/messageset"
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"google.golang.org/protobuf/internal/order"
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pref "google.golang.org/protobuf/reflect/protoreflect"
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piface "google.golang.org/protobuf/runtime/protoiface"
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)
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// coderMessageInfo contains per-message information used by the fast-path functions.
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// This is a different type from MessageInfo to keep MessageInfo as general-purpose as
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// possible.
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type coderMessageInfo struct {
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methods piface.Methods
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orderedCoderFields []*coderFieldInfo
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denseCoderFields []*coderFieldInfo
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coderFields map[protowire.Number]*coderFieldInfo
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sizecacheOffset offset
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unknownOffset offset
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unknownPtrKind bool
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extensionOffset offset
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needsInitCheck bool
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isMessageSet bool
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numRequiredFields uint8
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}
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type coderFieldInfo struct {
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funcs pointerCoderFuncs // fast-path per-field functions
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mi *MessageInfo // field's message
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ft reflect.Type
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validation validationInfo // information used by message validation
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num pref.FieldNumber // field number
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offset offset // struct field offset
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wiretag uint64 // field tag (number + wire type)
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tagsize int // size of the varint-encoded tag
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isPointer bool // true if IsNil may be called on the struct field
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isRequired bool // true if field is required
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}
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func (mi *MessageInfo) makeCoderMethods(t reflect.Type, si structInfo) {
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mi.sizecacheOffset = invalidOffset
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mi.unknownOffset = invalidOffset
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mi.extensionOffset = invalidOffset
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if si.sizecacheOffset.IsValid() && si.sizecacheType == sizecacheType {
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mi.sizecacheOffset = si.sizecacheOffset
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}
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if si.unknownOffset.IsValid() && (si.unknownType == unknownFieldsAType || si.unknownType == unknownFieldsBType) {
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mi.unknownOffset = si.unknownOffset
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mi.unknownPtrKind = si.unknownType.Kind() == reflect.Ptr
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}
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if si.extensionOffset.IsValid() && si.extensionType == extensionFieldsType {
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mi.extensionOffset = si.extensionOffset
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}
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mi.coderFields = make(map[protowire.Number]*coderFieldInfo)
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fields := mi.Desc.Fields()
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preallocFields := make([]coderFieldInfo, fields.Len())
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for i := 0; i < fields.Len(); i++ {
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fd := fields.Get(i)
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fs := si.fieldsByNumber[fd.Number()]
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isOneof := fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic()
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if isOneof {
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fs = si.oneofsByName[fd.ContainingOneof().Name()]
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}
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ft := fs.Type
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var wiretag uint64
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if !fd.IsPacked() {
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wiretag = protowire.EncodeTag(fd.Number(), wireTypes[fd.Kind()])
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} else {
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wiretag = protowire.EncodeTag(fd.Number(), protowire.BytesType)
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}
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var fieldOffset offset
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var funcs pointerCoderFuncs
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var childMessage *MessageInfo
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switch {
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case ft == nil:
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// This never occurs for generated message types.
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// It implies that a hand-crafted type has missing Go fields
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// for specific protobuf message fields.
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funcs = pointerCoderFuncs{
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size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
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return 0
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},
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marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
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return nil, nil
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},
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unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
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panic("missing Go struct field for " + string(fd.FullName()))
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},
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isInit: func(p pointer, f *coderFieldInfo) error {
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panic("missing Go struct field for " + string(fd.FullName()))
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},
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merge: func(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
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panic("missing Go struct field for " + string(fd.FullName()))
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},
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}
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case isOneof:
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fieldOffset = offsetOf(fs, mi.Exporter)
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case fd.IsWeak():
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fieldOffset = si.weakOffset
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funcs = makeWeakMessageFieldCoder(fd)
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default:
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fieldOffset = offsetOf(fs, mi.Exporter)
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childMessage, funcs = fieldCoder(fd, ft)
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}
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cf := &preallocFields[i]
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*cf = coderFieldInfo{
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num: fd.Number(),
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offset: fieldOffset,
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wiretag: wiretag,
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ft: ft,
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tagsize: protowire.SizeVarint(wiretag),
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funcs: funcs,
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mi: childMessage,
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validation: newFieldValidationInfo(mi, si, fd, ft),
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isPointer: fd.Cardinality() == pref.Repeated || fd.HasPresence(),
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isRequired: fd.Cardinality() == pref.Required,
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}
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mi.orderedCoderFields = append(mi.orderedCoderFields, cf)
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mi.coderFields[cf.num] = cf
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}
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for i, oneofs := 0, mi.Desc.Oneofs(); i < oneofs.Len(); i++ {
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if od := oneofs.Get(i); !od.IsSynthetic() {
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mi.initOneofFieldCoders(od, si)
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}
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}
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if messageset.IsMessageSet(mi.Desc) {
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if !mi.extensionOffset.IsValid() {
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panic(fmt.Sprintf("%v: MessageSet with no extensions field", mi.Desc.FullName()))
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}
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if !mi.unknownOffset.IsValid() {
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panic(fmt.Sprintf("%v: MessageSet with no unknown field", mi.Desc.FullName()))
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}
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mi.isMessageSet = true
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}
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sort.Slice(mi.orderedCoderFields, func(i, j int) bool {
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return mi.orderedCoderFields[i].num < mi.orderedCoderFields[j].num
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})
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var maxDense pref.FieldNumber
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for _, cf := range mi.orderedCoderFields {
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if cf.num >= 16 && cf.num >= 2*maxDense {
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break
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}
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maxDense = cf.num
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}
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mi.denseCoderFields = make([]*coderFieldInfo, maxDense+1)
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for _, cf := range mi.orderedCoderFields {
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if int(cf.num) >= len(mi.denseCoderFields) {
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break
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}
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mi.denseCoderFields[cf.num] = cf
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}
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// To preserve compatibility with historic wire output, marshal oneofs last.
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if mi.Desc.Oneofs().Len() > 0 {
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sort.Slice(mi.orderedCoderFields, func(i, j int) bool {
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fi := fields.ByNumber(mi.orderedCoderFields[i].num)
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fj := fields.ByNumber(mi.orderedCoderFields[j].num)
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return order.LegacyFieldOrder(fi, fj)
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})
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}
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mi.needsInitCheck = needsInitCheck(mi.Desc)
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if mi.methods.Marshal == nil && mi.methods.Size == nil {
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mi.methods.Flags |= piface.SupportMarshalDeterministic
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mi.methods.Marshal = mi.marshal
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mi.methods.Size = mi.size
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}
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if mi.methods.Unmarshal == nil {
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mi.methods.Flags |= piface.SupportUnmarshalDiscardUnknown
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mi.methods.Unmarshal = mi.unmarshal
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}
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if mi.methods.CheckInitialized == nil {
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mi.methods.CheckInitialized = mi.checkInitialized
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}
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if mi.methods.Merge == nil {
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mi.methods.Merge = mi.merge
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}
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}
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// getUnknownBytes returns a *[]byte for the unknown fields.
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// It is the caller's responsibility to check whether the pointer is nil.
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// This function is specially designed to be inlineable.
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func (mi *MessageInfo) getUnknownBytes(p pointer) *[]byte {
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if mi.unknownPtrKind {
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return *p.Apply(mi.unknownOffset).BytesPtr()
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} else {
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return p.Apply(mi.unknownOffset).Bytes()
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}
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}
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// mutableUnknownBytes returns a *[]byte for the unknown fields.
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// The returned pointer is guaranteed to not be nil.
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func (mi *MessageInfo) mutableUnknownBytes(p pointer) *[]byte {
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if mi.unknownPtrKind {
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bp := p.Apply(mi.unknownOffset).BytesPtr()
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if *bp == nil {
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*bp = new([]byte)
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}
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return *bp
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} else {
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return p.Apply(mi.unknownOffset).Bytes()
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}
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}
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