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