mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-27 15:36:25 +00:00
464 lines
14 KiB
Go
464 lines
14 KiB
Go
// 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 impl
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
|
|
"google.golang.org/protobuf/internal/detrand"
|
|
"google.golang.org/protobuf/internal/pragma"
|
|
"google.golang.org/protobuf/reflect/protoreflect"
|
|
)
|
|
|
|
type reflectMessageInfo struct {
|
|
fields map[protoreflect.FieldNumber]*fieldInfo
|
|
oneofs map[protoreflect.Name]*oneofInfo
|
|
|
|
// fieldTypes contains the zero value of an enum or message field.
|
|
// For lists, it contains the element type.
|
|
// For maps, it contains the entry value type.
|
|
fieldTypes map[protoreflect.FieldNumber]interface{}
|
|
|
|
// denseFields is a subset of fields where:
|
|
// 0 < fieldDesc.Number() < len(denseFields)
|
|
// It provides faster access to the fieldInfo, but may be incomplete.
|
|
denseFields []*fieldInfo
|
|
|
|
// rangeInfos is a list of all fields (not belonging to a oneof) and oneofs.
|
|
rangeInfos []interface{} // either *fieldInfo or *oneofInfo
|
|
|
|
getUnknown func(pointer) protoreflect.RawFields
|
|
setUnknown func(pointer, protoreflect.RawFields)
|
|
extensionMap func(pointer) *extensionMap
|
|
|
|
nilMessage atomicNilMessage
|
|
}
|
|
|
|
// makeReflectFuncs generates the set of functions to support reflection.
|
|
func (mi *MessageInfo) makeReflectFuncs(t reflect.Type, si structInfo) {
|
|
mi.makeKnownFieldsFunc(si)
|
|
mi.makeUnknownFieldsFunc(t, si)
|
|
mi.makeExtensionFieldsFunc(t, si)
|
|
mi.makeFieldTypes(si)
|
|
}
|
|
|
|
// makeKnownFieldsFunc generates functions for operations that can be performed
|
|
// on each protobuf message field. It takes in a reflect.Type representing the
|
|
// Go struct and matches message fields with struct fields.
|
|
//
|
|
// This code assumes that the struct is well-formed and panics if there are
|
|
// any discrepancies.
|
|
func (mi *MessageInfo) makeKnownFieldsFunc(si structInfo) {
|
|
mi.fields = map[protoreflect.FieldNumber]*fieldInfo{}
|
|
md := mi.Desc
|
|
fds := md.Fields()
|
|
for i := 0; i < fds.Len(); i++ {
|
|
fd := fds.Get(i)
|
|
fs := si.fieldsByNumber[fd.Number()]
|
|
isOneof := fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic()
|
|
if isOneof {
|
|
fs = si.oneofsByName[fd.ContainingOneof().Name()]
|
|
}
|
|
var fi fieldInfo
|
|
switch {
|
|
case fs.Type == nil:
|
|
fi = fieldInfoForMissing(fd) // never occurs for officially generated message types
|
|
case isOneof:
|
|
fi = fieldInfoForOneof(fd, fs, mi.Exporter, si.oneofWrappersByNumber[fd.Number()])
|
|
case fd.IsMap():
|
|
fi = fieldInfoForMap(fd, fs, mi.Exporter)
|
|
case fd.IsList():
|
|
fi = fieldInfoForList(fd, fs, mi.Exporter)
|
|
case fd.IsWeak():
|
|
fi = fieldInfoForWeakMessage(fd, si.weakOffset)
|
|
case fd.Message() != nil:
|
|
fi = fieldInfoForMessage(fd, fs, mi.Exporter)
|
|
default:
|
|
fi = fieldInfoForScalar(fd, fs, mi.Exporter)
|
|
}
|
|
mi.fields[fd.Number()] = &fi
|
|
}
|
|
|
|
mi.oneofs = map[protoreflect.Name]*oneofInfo{}
|
|
for i := 0; i < md.Oneofs().Len(); i++ {
|
|
od := md.Oneofs().Get(i)
|
|
mi.oneofs[od.Name()] = makeOneofInfo(od, si, mi.Exporter)
|
|
}
|
|
|
|
mi.denseFields = make([]*fieldInfo, fds.Len()*2)
|
|
for i := 0; i < fds.Len(); i++ {
|
|
if fd := fds.Get(i); int(fd.Number()) < len(mi.denseFields) {
|
|
mi.denseFields[fd.Number()] = mi.fields[fd.Number()]
|
|
}
|
|
}
|
|
|
|
for i := 0; i < fds.Len(); {
|
|
fd := fds.Get(i)
|
|
if od := fd.ContainingOneof(); od != nil && !od.IsSynthetic() {
|
|
mi.rangeInfos = append(mi.rangeInfos, mi.oneofs[od.Name()])
|
|
i += od.Fields().Len()
|
|
} else {
|
|
mi.rangeInfos = append(mi.rangeInfos, mi.fields[fd.Number()])
|
|
i++
|
|
}
|
|
}
|
|
|
|
// Introduce instability to iteration order, but keep it deterministic.
|
|
if len(mi.rangeInfos) > 1 && detrand.Bool() {
|
|
i := detrand.Intn(len(mi.rangeInfos) - 1)
|
|
mi.rangeInfos[i], mi.rangeInfos[i+1] = mi.rangeInfos[i+1], mi.rangeInfos[i]
|
|
}
|
|
}
|
|
|
|
func (mi *MessageInfo) makeUnknownFieldsFunc(t reflect.Type, si structInfo) {
|
|
switch {
|
|
case si.unknownOffset.IsValid() && si.unknownType == unknownFieldsAType:
|
|
// Handle as []byte.
|
|
mi.getUnknown = func(p pointer) protoreflect.RawFields {
|
|
if p.IsNil() {
|
|
return nil
|
|
}
|
|
return *p.Apply(mi.unknownOffset).Bytes()
|
|
}
|
|
mi.setUnknown = func(p pointer, b protoreflect.RawFields) {
|
|
if p.IsNil() {
|
|
panic("invalid SetUnknown on nil Message")
|
|
}
|
|
*p.Apply(mi.unknownOffset).Bytes() = b
|
|
}
|
|
case si.unknownOffset.IsValid() && si.unknownType == unknownFieldsBType:
|
|
// Handle as *[]byte.
|
|
mi.getUnknown = func(p pointer) protoreflect.RawFields {
|
|
if p.IsNil() {
|
|
return nil
|
|
}
|
|
bp := p.Apply(mi.unknownOffset).BytesPtr()
|
|
if *bp == nil {
|
|
return nil
|
|
}
|
|
return **bp
|
|
}
|
|
mi.setUnknown = func(p pointer, b protoreflect.RawFields) {
|
|
if p.IsNil() {
|
|
panic("invalid SetUnknown on nil Message")
|
|
}
|
|
bp := p.Apply(mi.unknownOffset).BytesPtr()
|
|
if *bp == nil {
|
|
*bp = new([]byte)
|
|
}
|
|
**bp = b
|
|
}
|
|
default:
|
|
mi.getUnknown = func(pointer) protoreflect.RawFields {
|
|
return nil
|
|
}
|
|
mi.setUnknown = func(p pointer, _ protoreflect.RawFields) {
|
|
if p.IsNil() {
|
|
panic("invalid SetUnknown on nil Message")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (mi *MessageInfo) makeExtensionFieldsFunc(t reflect.Type, si structInfo) {
|
|
if si.extensionOffset.IsValid() {
|
|
mi.extensionMap = func(p pointer) *extensionMap {
|
|
if p.IsNil() {
|
|
return (*extensionMap)(nil)
|
|
}
|
|
v := p.Apply(si.extensionOffset).AsValueOf(extensionFieldsType)
|
|
return (*extensionMap)(v.Interface().(*map[int32]ExtensionField))
|
|
}
|
|
} else {
|
|
mi.extensionMap = func(pointer) *extensionMap {
|
|
return (*extensionMap)(nil)
|
|
}
|
|
}
|
|
}
|
|
func (mi *MessageInfo) makeFieldTypes(si structInfo) {
|
|
md := mi.Desc
|
|
fds := md.Fields()
|
|
for i := 0; i < fds.Len(); i++ {
|
|
var ft reflect.Type
|
|
fd := fds.Get(i)
|
|
fs := si.fieldsByNumber[fd.Number()]
|
|
isOneof := fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic()
|
|
if isOneof {
|
|
fs = si.oneofsByName[fd.ContainingOneof().Name()]
|
|
}
|
|
var isMessage bool
|
|
switch {
|
|
case fs.Type == nil:
|
|
continue // never occurs for officially generated message types
|
|
case isOneof:
|
|
if fd.Enum() != nil || fd.Message() != nil {
|
|
ft = si.oneofWrappersByNumber[fd.Number()].Field(0).Type
|
|
}
|
|
case fd.IsMap():
|
|
if fd.MapValue().Enum() != nil || fd.MapValue().Message() != nil {
|
|
ft = fs.Type.Elem()
|
|
}
|
|
isMessage = fd.MapValue().Message() != nil
|
|
case fd.IsList():
|
|
if fd.Enum() != nil || fd.Message() != nil {
|
|
ft = fs.Type.Elem()
|
|
}
|
|
isMessage = fd.Message() != nil
|
|
case fd.Enum() != nil:
|
|
ft = fs.Type
|
|
if fd.HasPresence() && ft.Kind() == reflect.Ptr {
|
|
ft = ft.Elem()
|
|
}
|
|
case fd.Message() != nil:
|
|
ft = fs.Type
|
|
if fd.IsWeak() {
|
|
ft = nil
|
|
}
|
|
isMessage = true
|
|
}
|
|
if isMessage && ft != nil && ft.Kind() != reflect.Ptr {
|
|
ft = reflect.PtrTo(ft) // never occurs for officially generated message types
|
|
}
|
|
if ft != nil {
|
|
if mi.fieldTypes == nil {
|
|
mi.fieldTypes = make(map[protoreflect.FieldNumber]interface{})
|
|
}
|
|
mi.fieldTypes[fd.Number()] = reflect.Zero(ft).Interface()
|
|
}
|
|
}
|
|
}
|
|
|
|
type extensionMap map[int32]ExtensionField
|
|
|
|
func (m *extensionMap) Range(f func(protoreflect.FieldDescriptor, protoreflect.Value) bool) {
|
|
if m != nil {
|
|
for _, x := range *m {
|
|
xd := x.Type().TypeDescriptor()
|
|
v := x.Value()
|
|
if xd.IsList() && v.List().Len() == 0 {
|
|
continue
|
|
}
|
|
if !f(xd, v) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
func (m *extensionMap) Has(xt protoreflect.ExtensionType) (ok bool) {
|
|
if m == nil {
|
|
return false
|
|
}
|
|
xd := xt.TypeDescriptor()
|
|
x, ok := (*m)[int32(xd.Number())]
|
|
if !ok {
|
|
return false
|
|
}
|
|
switch {
|
|
case xd.IsList():
|
|
return x.Value().List().Len() > 0
|
|
case xd.IsMap():
|
|
return x.Value().Map().Len() > 0
|
|
case xd.Message() != nil:
|
|
return x.Value().Message().IsValid()
|
|
}
|
|
return true
|
|
}
|
|
func (m *extensionMap) Clear(xt protoreflect.ExtensionType) {
|
|
delete(*m, int32(xt.TypeDescriptor().Number()))
|
|
}
|
|
func (m *extensionMap) Get(xt protoreflect.ExtensionType) protoreflect.Value {
|
|
xd := xt.TypeDescriptor()
|
|
if m != nil {
|
|
if x, ok := (*m)[int32(xd.Number())]; ok {
|
|
return x.Value()
|
|
}
|
|
}
|
|
return xt.Zero()
|
|
}
|
|
func (m *extensionMap) Set(xt protoreflect.ExtensionType, v protoreflect.Value) {
|
|
xd := xt.TypeDescriptor()
|
|
isValid := true
|
|
switch {
|
|
case !xt.IsValidValue(v):
|
|
isValid = false
|
|
case xd.IsList():
|
|
isValid = v.List().IsValid()
|
|
case xd.IsMap():
|
|
isValid = v.Map().IsValid()
|
|
case xd.Message() != nil:
|
|
isValid = v.Message().IsValid()
|
|
}
|
|
if !isValid {
|
|
panic(fmt.Sprintf("%v: assigning invalid value", xt.TypeDescriptor().FullName()))
|
|
}
|
|
|
|
if *m == nil {
|
|
*m = make(map[int32]ExtensionField)
|
|
}
|
|
var x ExtensionField
|
|
x.Set(xt, v)
|
|
(*m)[int32(xd.Number())] = x
|
|
}
|
|
func (m *extensionMap) Mutable(xt protoreflect.ExtensionType) protoreflect.Value {
|
|
xd := xt.TypeDescriptor()
|
|
if xd.Kind() != protoreflect.MessageKind && xd.Kind() != protoreflect.GroupKind && !xd.IsList() && !xd.IsMap() {
|
|
panic("invalid Mutable on field with non-composite type")
|
|
}
|
|
if x, ok := (*m)[int32(xd.Number())]; ok {
|
|
return x.Value()
|
|
}
|
|
v := xt.New()
|
|
m.Set(xt, v)
|
|
return v
|
|
}
|
|
|
|
// MessageState is a data structure that is nested as the first field in a
|
|
// concrete message. It provides a way to implement the ProtoReflect method
|
|
// in an allocation-free way without needing to have a shadow Go type generated
|
|
// for every message type. This technique only works using unsafe.
|
|
//
|
|
// Example generated code:
|
|
//
|
|
// type M struct {
|
|
// state protoimpl.MessageState
|
|
//
|
|
// Field1 int32
|
|
// Field2 string
|
|
// Field3 *BarMessage
|
|
// ...
|
|
// }
|
|
//
|
|
// func (m *M) ProtoReflect() protoreflect.Message {
|
|
// mi := &file_fizz_buzz_proto_msgInfos[5]
|
|
// if protoimpl.UnsafeEnabled && m != nil {
|
|
// ms := protoimpl.X.MessageStateOf(Pointer(m))
|
|
// if ms.LoadMessageInfo() == nil {
|
|
// ms.StoreMessageInfo(mi)
|
|
// }
|
|
// return ms
|
|
// }
|
|
// return mi.MessageOf(m)
|
|
// }
|
|
//
|
|
// The MessageState type holds a *MessageInfo, which must be atomically set to
|
|
// the message info associated with a given message instance.
|
|
// By unsafely converting a *M into a *MessageState, the MessageState object
|
|
// has access to all the information needed to implement protobuf reflection.
|
|
// It has access to the message info as its first field, and a pointer to the
|
|
// MessageState is identical to a pointer to the concrete message value.
|
|
//
|
|
// Requirements:
|
|
// - The type M must implement protoreflect.ProtoMessage.
|
|
// - The address of m must not be nil.
|
|
// - The address of m and the address of m.state must be equal,
|
|
// even though they are different Go types.
|
|
type MessageState struct {
|
|
pragma.NoUnkeyedLiterals
|
|
pragma.DoNotCompare
|
|
pragma.DoNotCopy
|
|
|
|
atomicMessageInfo *MessageInfo
|
|
}
|
|
|
|
type messageState MessageState
|
|
|
|
var (
|
|
_ protoreflect.Message = (*messageState)(nil)
|
|
_ unwrapper = (*messageState)(nil)
|
|
)
|
|
|
|
// messageDataType is a tuple of a pointer to the message data and
|
|
// a pointer to the message type. It is a generalized way of providing a
|
|
// reflective view over a message instance. The disadvantage of this approach
|
|
// is the need to allocate this tuple of 16B.
|
|
type messageDataType struct {
|
|
p pointer
|
|
mi *MessageInfo
|
|
}
|
|
|
|
type (
|
|
messageReflectWrapper messageDataType
|
|
messageIfaceWrapper messageDataType
|
|
)
|
|
|
|
var (
|
|
_ protoreflect.Message = (*messageReflectWrapper)(nil)
|
|
_ unwrapper = (*messageReflectWrapper)(nil)
|
|
_ protoreflect.ProtoMessage = (*messageIfaceWrapper)(nil)
|
|
_ unwrapper = (*messageIfaceWrapper)(nil)
|
|
)
|
|
|
|
// MessageOf returns a reflective view over a message. The input must be a
|
|
// pointer to a named Go struct. If the provided type has a ProtoReflect method,
|
|
// it must be implemented by calling this method.
|
|
func (mi *MessageInfo) MessageOf(m interface{}) protoreflect.Message {
|
|
if reflect.TypeOf(m) != mi.GoReflectType {
|
|
panic(fmt.Sprintf("type mismatch: got %T, want %v", m, mi.GoReflectType))
|
|
}
|
|
p := pointerOfIface(m)
|
|
if p.IsNil() {
|
|
return mi.nilMessage.Init(mi)
|
|
}
|
|
return &messageReflectWrapper{p, mi}
|
|
}
|
|
|
|
func (m *messageReflectWrapper) pointer() pointer { return m.p }
|
|
func (m *messageReflectWrapper) messageInfo() *MessageInfo { return m.mi }
|
|
|
|
// Reset implements the v1 proto.Message.Reset method.
|
|
func (m *messageIfaceWrapper) Reset() {
|
|
if mr, ok := m.protoUnwrap().(interface{ Reset() }); ok {
|
|
mr.Reset()
|
|
return
|
|
}
|
|
rv := reflect.ValueOf(m.protoUnwrap())
|
|
if rv.Kind() == reflect.Ptr && !rv.IsNil() {
|
|
rv.Elem().Set(reflect.Zero(rv.Type().Elem()))
|
|
}
|
|
}
|
|
func (m *messageIfaceWrapper) ProtoReflect() protoreflect.Message {
|
|
return (*messageReflectWrapper)(m)
|
|
}
|
|
func (m *messageIfaceWrapper) protoUnwrap() interface{} {
|
|
return m.p.AsIfaceOf(m.mi.GoReflectType.Elem())
|
|
}
|
|
|
|
// checkField verifies that the provided field descriptor is valid.
|
|
// Exactly one of the returned values is populated.
|
|
func (mi *MessageInfo) checkField(fd protoreflect.FieldDescriptor) (*fieldInfo, protoreflect.ExtensionType) {
|
|
var fi *fieldInfo
|
|
if n := fd.Number(); 0 < n && int(n) < len(mi.denseFields) {
|
|
fi = mi.denseFields[n]
|
|
} else {
|
|
fi = mi.fields[n]
|
|
}
|
|
if fi != nil {
|
|
if fi.fieldDesc != fd {
|
|
if got, want := fd.FullName(), fi.fieldDesc.FullName(); got != want {
|
|
panic(fmt.Sprintf("mismatching field: got %v, want %v", got, want))
|
|
}
|
|
panic(fmt.Sprintf("mismatching field: %v", fd.FullName()))
|
|
}
|
|
return fi, nil
|
|
}
|
|
|
|
if fd.IsExtension() {
|
|
if got, want := fd.ContainingMessage().FullName(), mi.Desc.FullName(); got != want {
|
|
// TODO: Should this be exact containing message descriptor match?
|
|
panic(fmt.Sprintf("extension %v has mismatching containing message: got %v, want %v", fd.FullName(), got, want))
|
|
}
|
|
if !mi.Desc.ExtensionRanges().Has(fd.Number()) {
|
|
panic(fmt.Sprintf("extension %v extends %v outside the extension range", fd.FullName(), mi.Desc.FullName()))
|
|
}
|
|
xtd, ok := fd.(protoreflect.ExtensionTypeDescriptor)
|
|
if !ok {
|
|
panic(fmt.Sprintf("extension %v does not implement protoreflect.ExtensionTypeDescriptor", fd.FullName()))
|
|
}
|
|
return nil, xtd.Type()
|
|
}
|
|
panic(fmt.Sprintf("field %v is invalid", fd.FullName()))
|
|
}
|