mirror of https://github.com/tidwall/tile38.git
142 lines
3.5 KiB
Go
142 lines
3.5 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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"sync"
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"google.golang.org/protobuf/internal/errors"
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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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func (mi *MessageInfo) checkInitialized(in piface.CheckInitializedInput) (piface.CheckInitializedOutput, error) {
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var p pointer
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if ms, ok := in.Message.(*messageState); ok {
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p = ms.pointer()
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} else {
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p = in.Message.(*messageReflectWrapper).pointer()
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}
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return piface.CheckInitializedOutput{}, mi.checkInitializedPointer(p)
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}
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func (mi *MessageInfo) checkInitializedPointer(p pointer) error {
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mi.init()
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if !mi.needsInitCheck {
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return nil
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}
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if p.IsNil() {
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for _, f := range mi.orderedCoderFields {
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if f.isRequired {
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return errors.RequiredNotSet(string(mi.Desc.Fields().ByNumber(f.num).FullName()))
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}
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}
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return nil
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}
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if mi.extensionOffset.IsValid() {
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e := p.Apply(mi.extensionOffset).Extensions()
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if err := mi.isInitExtensions(e); err != nil {
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return err
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}
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}
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for _, f := range mi.orderedCoderFields {
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if !f.isRequired && f.funcs.isInit == nil {
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continue
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}
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fptr := p.Apply(f.offset)
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if f.isPointer && fptr.Elem().IsNil() {
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if f.isRequired {
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return errors.RequiredNotSet(string(mi.Desc.Fields().ByNumber(f.num).FullName()))
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}
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continue
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}
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if f.funcs.isInit == nil {
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continue
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}
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if err := f.funcs.isInit(fptr, f); err != nil {
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return err
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}
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}
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return nil
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}
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func (mi *MessageInfo) isInitExtensions(ext *map[int32]ExtensionField) error {
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if ext == nil {
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return nil
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}
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for _, x := range *ext {
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ei := getExtensionFieldInfo(x.Type())
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if ei.funcs.isInit == nil {
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continue
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}
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v := x.Value()
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if !v.IsValid() {
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continue
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}
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if err := ei.funcs.isInit(v); err != nil {
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return err
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}
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}
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return nil
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}
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var (
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needsInitCheckMu sync.Mutex
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needsInitCheckMap sync.Map
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)
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// needsInitCheck reports whether a message needs to be checked for partial initialization.
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//
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// It returns true if the message transitively includes any required or extension fields.
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func needsInitCheck(md pref.MessageDescriptor) bool {
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if v, ok := needsInitCheckMap.Load(md); ok {
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if has, ok := v.(bool); ok {
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return has
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}
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}
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needsInitCheckMu.Lock()
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defer needsInitCheckMu.Unlock()
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return needsInitCheckLocked(md)
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}
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func needsInitCheckLocked(md pref.MessageDescriptor) (has bool) {
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if v, ok := needsInitCheckMap.Load(md); ok {
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// If has is true, we've previously determined that this message
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// needs init checks.
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//
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// If has is false, we've previously determined that it can never
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// be uninitialized.
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//
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// If has is not a bool, we've just encountered a cycle in the
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// message graph. In this case, it is safe to return false: If
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// the message does have required fields, we'll detect them later
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// in the graph traversal.
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has, ok := v.(bool)
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return ok && has
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}
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needsInitCheckMap.Store(md, struct{}{}) // avoid cycles while descending into this message
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defer func() {
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needsInitCheckMap.Store(md, has)
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}()
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if md.RequiredNumbers().Len() > 0 {
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return true
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}
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if md.ExtensionRanges().Len() > 0 {
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return true
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}
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for i := 0; i < md.Fields().Len(); i++ {
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fd := md.Fields().Get(i)
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// Map keys are never messages, so just consider the map value.
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if fd.IsMap() {
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fd = fd.MapValue()
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}
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fmd := fd.Message()
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if fmd != nil && needsInitCheckLocked(fmd) {
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return true
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}
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}
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return false
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}
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