mirror of
https://github.com/protocolbuffers/protobuf-go.git
synced 2025-01-04 02:38:50 +00:00
f8b855d768
The following adjustments were made: * The pragma.NoUnkeyedLiterals is moved to be the first field. This is done to keep the options struct smaller. Even if the last field is zero-length, Go GC implementation details forces the struct to be padded at the end. * Methods are documented as always treating AllowPartial as true. * Added a support flag for UnmarshalOptions.DiscardUnknown. Change-Id: I1f75d226542ab2bb0123d9cea143c7060df226d8 Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/185998 Reviewed-by: Damien Neil <dneil@google.com>
108 lines
3.3 KiB
Go
108 lines
3.3 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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"reflect"
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"sort"
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"google.golang.org/protobuf/internal/encoding/wire"
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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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orderedCoderFields []*coderFieldInfo
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denseCoderFields []*coderFieldInfo
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coderFields map[wire.Number]*coderFieldInfo
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sizecacheOffset offset
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unknownOffset offset
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extensionOffset offset
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needsInitCheck bool
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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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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) makeMethods(t reflect.Type, si structInfo) {
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mi.sizecacheOffset = si.sizecacheOffset
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mi.unknownOffset = si.unknownOffset
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mi.extensionOffset = si.extensionOffset
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mi.coderFields = make(map[wire.Number]*coderFieldInfo)
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for i := 0; i < mi.PBType.Descriptor().Fields().Len(); i++ {
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fd := mi.PBType.Descriptor().Fields().Get(i)
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fs := si.fieldsByNumber[fd.Number()]
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if fd.ContainingOneof() != nil {
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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 = wire.EncodeTag(fd.Number(), wireTypes[fd.Kind()])
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} else {
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wiretag = wire.EncodeTag(fd.Number(), wire.BytesType)
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}
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var funcs pointerCoderFuncs
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if fd.ContainingOneof() != nil {
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funcs = makeOneofFieldCoder(si, fd)
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} else {
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funcs = fieldCoder(fd, ft)
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}
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cf := &coderFieldInfo{
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num: fd.Number(),
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offset: offsetOf(fs, mi.Exporter),
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wiretag: wiretag,
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tagsize: wire.SizeVarint(wiretag),
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funcs: funcs,
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isPointer: (fd.Cardinality() == pref.Repeated ||
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fd.Kind() == pref.MessageKind ||
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fd.Kind() == pref.GroupKind ||
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fd.Syntax() != pref.Proto3),
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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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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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mi.needsInitCheck = needsInitCheck(mi.PBType)
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mi.methods = piface.Methods{
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Flags: piface.SupportMarshalDeterministic | piface.SupportUnmarshalDiscardUnknown,
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MarshalAppend: mi.marshalAppend,
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Unmarshal: mi.unmarshal,
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Size: mi.size,
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IsInitialized: mi.isInitialized,
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}
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}
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