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// Copyright 2019 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 filedesc
import (
"fmt"
"sync"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/internal/genid"
"google.golang.org/protobuf/internal/strs"
"google.golang.org/protobuf/reflect/protoreflect"
)
// fileRaw is a data struct used when initializing a file descriptor from
// a raw FileDescriptorProto.
type fileRaw struct {
builder Builder
allEnums []Enum
allMessages []Message
allExtensions []Extension
allServices []Service
}
func newRawFile(db Builder) *File {
fd := &File{fileRaw: fileRaw{builder: db}}
fd.initDecls(db.NumEnums, db.NumMessages, db.NumExtensions, db.NumServices)
fd.unmarshalSeed(db.RawDescriptor)
// Extended message targets are eagerly resolved since registration
// needs this information at program init time.
for i := range fd.allExtensions {
xd := &fd.allExtensions[i]
xd.L1.Extendee = fd.resolveMessageDependency(xd.L1.Extendee, listExtTargets, int32(i))
}
fd.checkDecls()
return fd
}
// initDecls pre-allocates slices for the exact number of enums, messages
// (including map entries), extensions, and services declared in the proto file.
// This is done to avoid regrowing the slice, which would change the address
// for any previously seen declaration.
//
// The alloc methods "allocates" slices by pulling from the capacity.
func (fd *File) initDecls(numEnums, numMessages, numExtensions, numServices int32) {
fd.allEnums = make([]Enum, 0, numEnums)
fd.allMessages = make([]Message, 0, numMessages)
fd.allExtensions = make([]Extension, 0, numExtensions)
fd.allServices = make([]Service, 0, numServices)
}
func (fd *File) allocEnums(n int) []Enum {
total := len(fd.allEnums)
es := fd.allEnums[total : total+n]
fd.allEnums = fd.allEnums[:total+n]
return es
}
func (fd *File) allocMessages(n int) []Message {
total := len(fd.allMessages)
ms := fd.allMessages[total : total+n]
fd.allMessages = fd.allMessages[:total+n]
return ms
}
func (fd *File) allocExtensions(n int) []Extension {
total := len(fd.allExtensions)
xs := fd.allExtensions[total : total+n]
fd.allExtensions = fd.allExtensions[:total+n]
return xs
}
func (fd *File) allocServices(n int) []Service {
total := len(fd.allServices)
xs := fd.allServices[total : total+n]
fd.allServices = fd.allServices[:total+n]
return xs
}
// checkDecls performs a sanity check that the expected number of expected
// declarations matches the number that were found in the descriptor proto.
func (fd *File) checkDecls() {
switch {
case len(fd.allEnums) != cap(fd.allEnums):
case len(fd.allMessages) != cap(fd.allMessages):
case len(fd.allExtensions) != cap(fd.allExtensions):
case len(fd.allServices) != cap(fd.allServices):
default:
return
}
panic("mismatching cardinality")
}
func (fd *File) unmarshalSeed(b []byte) {
sb := getBuilder()
defer putBuilder(sb)
var prevField protoreflect.FieldNumber
var numEnums, numMessages, numExtensions, numServices int
var posEnums, posMessages, posExtensions, posServices int
var options []byte
b0 := b
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.FileDescriptorProto_Syntax_field_number:
switch string(v) {
case "proto2":
fd.L1.Syntax = protoreflect.Proto2
fd.L1.Edition = EditionProto2
case "proto3":
fd.L1.Syntax = protoreflect.Proto3
fd.L1.Edition = EditionProto3
case "editions":
fd.L1.Syntax = protoreflect.Editions
default:
panic("invalid syntax")
}
case genid.FileDescriptorProto_Name_field_number:
fd.L1.Path = sb.MakeString(v)
case genid.FileDescriptorProto_Package_field_number:
fd.L1.Package = protoreflect.FullName(sb.MakeString(v))
case genid.FileDescriptorProto_Options_field_number:
options = v
case genid.FileDescriptorProto_EnumType_field_number:
if prevField != genid.FileDescriptorProto_EnumType_field_number {
if numEnums > 0 {
panic("non-contiguous repeated field")
}
posEnums = len(b0) - len(b) - n - m
}
numEnums++
case genid.FileDescriptorProto_MessageType_field_number:
if prevField != genid.FileDescriptorProto_MessageType_field_number {
if numMessages > 0 {
panic("non-contiguous repeated field")
}
posMessages = len(b0) - len(b) - n - m
}
numMessages++
case genid.FileDescriptorProto_Extension_field_number:
if prevField != genid.FileDescriptorProto_Extension_field_number {
if numExtensions > 0 {
panic("non-contiguous repeated field")
}
posExtensions = len(b0) - len(b) - n - m
}
numExtensions++
case genid.FileDescriptorProto_Service_field_number:
if prevField != genid.FileDescriptorProto_Service_field_number {
if numServices > 0 {
panic("non-contiguous repeated field")
}
posServices = len(b0) - len(b) - n - m
}
numServices++
}
prevField = num
case protowire.VarintType:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
switch num {
case genid.FileDescriptorProto_Edition_field_number:
fd.L1.Edition = Edition(v)
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
prevField = -1 // ignore known field numbers of unknown wire type
}
}
// If syntax is missing, it is assumed to be proto2.
if fd.L1.Syntax == 0 {
fd.L1.Syntax = protoreflect.Proto2
fd.L1.Edition = EditionProto2
}
fd.L1.EditionFeatures = getFeaturesFor(fd.L1.Edition)
// Parse editions features from options if any
if options != nil {
fd.unmarshalSeedOptions(options)
}
// Must allocate all declarations before parsing each descriptor type
// to ensure we handled all descriptors in "flattened ordering".
if numEnums > 0 {
fd.L1.Enums.List = fd.allocEnums(numEnums)
}
if numMessages > 0 {
fd.L1.Messages.List = fd.allocMessages(numMessages)
}
if numExtensions > 0 {
fd.L1.Extensions.List = fd.allocExtensions(numExtensions)
}
if numServices > 0 {
fd.L1.Services.List = fd.allocServices(numServices)
}
if numEnums > 0 {
b := b0[posEnums:]
for i := range fd.L1.Enums.List {
_, n := protowire.ConsumeVarint(b)
v, m := protowire.ConsumeBytes(b[n:])
fd.L1.Enums.List[i].unmarshalSeed(v, sb, fd, fd, i)
b = b[n+m:]
}
}
if numMessages > 0 {
b := b0[posMessages:]
for i := range fd.L1.Messages.List {
_, n := protowire.ConsumeVarint(b)
v, m := protowire.ConsumeBytes(b[n:])
fd.L1.Messages.List[i].unmarshalSeed(v, sb, fd, fd, i)
b = b[n+m:]
}
}
if numExtensions > 0 {
b := b0[posExtensions:]
for i := range fd.L1.Extensions.List {
_, n := protowire.ConsumeVarint(b)
v, m := protowire.ConsumeBytes(b[n:])
fd.L1.Extensions.List[i].unmarshalSeed(v, sb, fd, fd, i)
b = b[n+m:]
}
}
if numServices > 0 {
b := b0[posServices:]
for i := range fd.L1.Services.List {
_, n := protowire.ConsumeVarint(b)
v, m := protowire.ConsumeBytes(b[n:])
fd.L1.Services.List[i].unmarshalSeed(v, sb, fd, fd, i)
b = b[n+m:]
}
}
}
func (fd *File) unmarshalSeedOptions(b []byte) {
for b := b; len(b) > 0; {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.FileOptions_Features_field_number:
if fd.Syntax() != protoreflect.Editions {
panic(fmt.Sprintf("invalid descriptor: using edition features in a proto with syntax %s", fd.Syntax()))
}
fd.L1.EditionFeatures = unmarshalFeatureSet(v, fd.L1.EditionFeatures)
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
}
}
}
func (ed *Enum) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd protoreflect.Descriptor, i int) {
ed.L0.ParentFile = pf
ed.L0.Parent = pd
ed.L0.Index = i
ed.L1.EditionFeatures = featuresFromParentDesc(ed.Parent())
var numValues int
for b := b; len(b) > 0; {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.EnumDescriptorProto_Name_field_number:
ed.L0.FullName = appendFullName(sb, pd.FullName(), v)
case genid.EnumDescriptorProto_Value_field_number:
numValues++
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
}
}
// Only construct enum value descriptors for top-level enums since
// they are needed for registration.
if pd != pf {
return
}
ed.L1.eagerValues = true
ed.L2 = new(EnumL2)
ed.L2.Values.List = make([]EnumValue, numValues)
for i := 0; len(b) > 0; {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.EnumDescriptorProto_Value_field_number:
ed.L2.Values.List[i].unmarshalFull(v, sb, pf, ed, i)
i++
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
}
}
}
func (md *Message) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd protoreflect.Descriptor, i int) {
md.L0.ParentFile = pf
md.L0.Parent = pd
md.L0.Index = i
md.L1.EditionFeatures = featuresFromParentDesc(md.Parent())
var prevField protoreflect.FieldNumber
var numEnums, numMessages, numExtensions int
var posEnums, posMessages, posExtensions int
b0 := b
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.DescriptorProto_Name_field_number:
md.L0.FullName = appendFullName(sb, pd.FullName(), v)
case genid.DescriptorProto_EnumType_field_number:
if prevField != genid.DescriptorProto_EnumType_field_number {
if numEnums > 0 {
panic("non-contiguous repeated field")
}
posEnums = len(b0) - len(b) - n - m
}
numEnums++
case genid.DescriptorProto_NestedType_field_number:
if prevField != genid.DescriptorProto_NestedType_field_number {
if numMessages > 0 {
panic("non-contiguous repeated field")
}
posMessages = len(b0) - len(b) - n - m
}
numMessages++
case genid.DescriptorProto_Extension_field_number:
if prevField != genid.DescriptorProto_Extension_field_number {
if numExtensions > 0 {
panic("non-contiguous repeated field")
}
posExtensions = len(b0) - len(b) - n - m
}
numExtensions++
case genid.DescriptorProto_Options_field_number:
md.unmarshalSeedOptions(v)
}
prevField = num
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
prevField = -1 // ignore known field numbers of unknown wire type
}
}
// Must allocate all declarations before parsing each descriptor type
// to ensure we handled all descriptors in "flattened ordering".
if numEnums > 0 {
md.L1.Enums.List = pf.allocEnums(numEnums)
}
if numMessages > 0 {
md.L1.Messages.List = pf.allocMessages(numMessages)
}
if numExtensions > 0 {
md.L1.Extensions.List = pf.allocExtensions(numExtensions)
}
if numEnums > 0 {
b := b0[posEnums:]
for i := range md.L1.Enums.List {
_, n := protowire.ConsumeVarint(b)
v, m := protowire.ConsumeBytes(b[n:])
md.L1.Enums.List[i].unmarshalSeed(v, sb, pf, md, i)
b = b[n+m:]
}
}
if numMessages > 0 {
b := b0[posMessages:]
for i := range md.L1.Messages.List {
_, n := protowire.ConsumeVarint(b)
v, m := protowire.ConsumeBytes(b[n:])
md.L1.Messages.List[i].unmarshalSeed(v, sb, pf, md, i)
b = b[n+m:]
}
}
if numExtensions > 0 {
b := b0[posExtensions:]
for i := range md.L1.Extensions.List {
_, n := protowire.ConsumeVarint(b)
v, m := protowire.ConsumeBytes(b[n:])
md.L1.Extensions.List[i].unmarshalSeed(v, sb, pf, md, i)
b = b[n+m:]
}
}
}
func (md *Message) unmarshalSeedOptions(b []byte) {
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.VarintType:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
switch num {
case genid.MessageOptions_MapEntry_field_number:
md.L1.IsMapEntry = protowire.DecodeBool(v)
case genid.MessageOptions_MessageSetWireFormat_field_number:
md.L1.IsMessageSet = protowire.DecodeBool(v)
}
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.MessageOptions_Features_field_number:
md.L1.EditionFeatures = unmarshalFeatureSet(v, md.L1.EditionFeatures)
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
}
}
}
func (xd *Extension) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd protoreflect.Descriptor, i int) {
xd.L0.ParentFile = pf
xd.L0.Parent = pd
xd.L0.Index = i
xd.L1.EditionFeatures = featuresFromParentDesc(pd)
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.VarintType:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
switch num {
case genid.FieldDescriptorProto_Number_field_number:
xd.L1.Number = protoreflect.FieldNumber(v)
case genid.FieldDescriptorProto_Label_field_number:
xd.L1.Cardinality = protoreflect.Cardinality(v)
case genid.FieldDescriptorProto_Type_field_number:
xd.L1.Kind = protoreflect.Kind(v)
}
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.FieldDescriptorProto_Name_field_number:
xd.L0.FullName = appendFullName(sb, pd.FullName(), v)
case genid.FieldDescriptorProto_Extendee_field_number:
xd.L1.Extendee = PlaceholderMessage(makeFullName(sb, v))
case genid.FieldDescriptorProto_Options_field_number:
xd.unmarshalOptions(v)
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
}
}
if xd.L1.Kind == protoreflect.MessageKind && xd.L1.EditionFeatures.IsDelimitedEncoded {
xd.L1.Kind = protoreflect.GroupKind
}
}
func (xd *Extension) unmarshalOptions(b []byte) {
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.VarintType:
v, m := protowire.ConsumeVarint(b)
b = b[m:]
switch num {
case genid.FieldOptions_Packed_field_number:
xd.L1.EditionFeatures.IsPacked = protowire.DecodeBool(v)
case genid.FieldOptions_Lazy_field_number:
xd.L1.IsLazy = protowire.DecodeBool(v)
}
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.FieldOptions_Features_field_number:
xd.L1.EditionFeatures = unmarshalFeatureSet(v, xd.L1.EditionFeatures)
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
}
}
}
func (sd *Service) unmarshalSeed(b []byte, sb *strs.Builder, pf *File, pd protoreflect.Descriptor, i int) {
sd.L0.ParentFile = pf
sd.L0.Parent = pd
sd.L0.Index = i
for len(b) > 0 {
num, typ, n := protowire.ConsumeTag(b)
b = b[n:]
switch typ {
case protowire.BytesType:
v, m := protowire.ConsumeBytes(b)
b = b[m:]
switch num {
case genid.ServiceDescriptorProto_Name_field_number:
sd.L0.FullName = appendFullName(sb, pd.FullName(), v)
}
default:
m := protowire.ConsumeFieldValue(num, typ, b)
b = b[m:]
}
}
}
var nameBuilderPool = sync.Pool{
New: func() any { return new(strs.Builder) },
}
func getBuilder() *strs.Builder {
return nameBuilderPool.Get().(*strs.Builder)
}
func putBuilder(b *strs.Builder) {
nameBuilderPool.Put(b)
}
// makeFullName converts b to a protoreflect.FullName,
// where b must start with a leading dot.
func makeFullName(sb *strs.Builder, b []byte) protoreflect.FullName {
if len(b) == 0 || b[0] != '.' {
panic("name reference must be fully qualified")
}
return protoreflect.FullName(sb.MakeString(b[1:]))
}
func appendFullName(sb *strs.Builder, prefix protoreflect.FullName, suffix []byte) protoreflect.FullName {
return sb.AppendFullName(prefix, protoreflect.Name(strs.UnsafeString(suffix)))
}