aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/google.golang.org/protobuf/internal/impl/codec_message_opaque.go
blob: 41c1f74ef81e9ca180b056e1ecac5148d2a7bb6f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
// 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
	}
}