TUN-8407: Upgrade go to version 1.22.2

vendor/google.golang.org/protobuf/reflect/protodesc/desc.go

@@ -3,16 +3,17 @@
 // license that can be found in the LICENSE file.
 
 // Package protodesc provides functionality for converting
-// FileDescriptorProto messages to/from protoreflect.FileDescriptor values.
+// FileDescriptorProto messages to/from [protoreflect.FileDescriptor] values.
 //
 // The google.protobuf.FileDescriptorProto is a protobuf message that describes
 // the type information for a .proto file in a form that is easily serializable.
-// The protoreflect.FileDescriptor is a more structured representation of
+// The [protoreflect.FileDescriptor] is a more structured representation of
 // the FileDescriptorProto message where references and remote dependencies
 // can be directly followed.
 package protodesc
 
 import (
+	"google.golang.org/protobuf/internal/editionssupport"
 	"google.golang.org/protobuf/internal/errors"
 	"google.golang.org/protobuf/internal/filedesc"
 	"google.golang.org/protobuf/internal/pragma"
@@ -24,11 +25,11 @@ import (
 	"google.golang.org/protobuf/types/descriptorpb"
 )
 
-// Resolver is the resolver used by NewFile to resolve dependencies.
+// Resolver is the resolver used by [NewFile] to resolve dependencies.
 // The enums and messages provided must belong to some parent file,
 // which is also registered.
 //
-// It is implemented by protoregistry.Files.
+// It is implemented by [protoregistry.Files].
 type Resolver interface {
 	FindFileByPath(string) (protoreflect.FileDescriptor, error)
 	FindDescriptorByName(protoreflect.FullName) (protoreflect.Descriptor, error)
@@ -61,19 +62,19 @@ type FileOptions struct {
 	AllowUnresolvable bool
 }
 
-// NewFile creates a new protoreflect.FileDescriptor from the provided
-// file descriptor message. See FileOptions.New for more information.
+// NewFile creates a new [protoreflect.FileDescriptor] from the provided
+// file descriptor message. See [FileOptions.New] for more information.
 func NewFile(fd *descriptorpb.FileDescriptorProto, r Resolver) (protoreflect.FileDescriptor, error) {
 	return FileOptions{}.New(fd, r)
 }
 
-// NewFiles creates a new protoregistry.Files from the provided
-// FileDescriptorSet message. See FileOptions.NewFiles for more information.
+// NewFiles creates a new [protoregistry.Files] from the provided
+// FileDescriptorSet message. See [FileOptions.NewFiles] for more information.
 func NewFiles(fd *descriptorpb.FileDescriptorSet) (*protoregistry.Files, error) {
 	return FileOptions{}.NewFiles(fd)
 }
 
-// New creates a new protoreflect.FileDescriptor from the provided
+// New creates a new [protoreflect.FileDescriptor] from the provided
 // file descriptor message. The file must represent a valid proto file according
 // to protobuf semantics. The returned descriptor is a deep copy of the input.
 //
@@ -91,11 +92,19 @@ func (o FileOptions) New(fd *descriptorpb.FileDescriptorProto, r Resolver) (prot
 	switch fd.GetSyntax() {
 	case "proto2", "":
 		f.L1.Syntax = protoreflect.Proto2
+		f.L1.Edition = filedesc.EditionProto2
 	case "proto3":
 		f.L1.Syntax = protoreflect.Proto3
+		f.L1.Edition = filedesc.EditionProto3
+	case "editions":
+		f.L1.Syntax = protoreflect.Editions
+		f.L1.Edition = fromEditionProto(fd.GetEdition())
 	default:
 		return nil, errors.New("invalid syntax: %q", fd.GetSyntax())
 	}
+	if f.L1.Syntax == protoreflect.Editions && (fd.GetEdition() < editionssupport.Minimum || fd.GetEdition() > editionssupport.Maximum) {
+		return nil, errors.New("use of edition %v not yet supported by the Go Protobuf runtime", fd.GetEdition())
+	}
 	f.L1.Path = fd.GetName()
 	if f.L1.Path == "" {
 		return nil, errors.New("file path must be populated")
@@ -108,6 +117,7 @@ func (o FileOptions) New(fd *descriptorpb.FileDescriptorProto, r Resolver) (prot
 		opts = proto.Clone(opts).(*descriptorpb.FileOptions)
 		f.L2.Options = func() protoreflect.ProtoMessage { return opts }
 	}
+	initFileDescFromFeatureSet(f, fd.GetOptions().GetFeatures())
 
 	f.L2.Imports = make(filedesc.FileImports, len(fd.GetDependency()))
 	for _, i := range fd.GetPublicDependency() {
@@ -210,10 +220,10 @@ func (o FileOptions) New(fd *descriptorpb.FileDescriptorProto, r Resolver) (prot
 	if err := validateEnumDeclarations(f.L1.Enums.List, fd.GetEnumType()); err != nil {
 		return nil, err
 	}
-	if err := validateMessageDeclarations(f.L1.Messages.List, fd.GetMessageType()); err != nil {
+	if err := validateMessageDeclarations(f, f.L1.Messages.List, fd.GetMessageType()); err != nil {
 		return nil, err
 	}
-	if err := validateExtensionDeclarations(f.L1.Extensions.List, fd.GetExtension()); err != nil {
+	if err := validateExtensionDeclarations(f, f.L1.Extensions.List, fd.GetExtension()); err != nil {
 		return nil, err
 	}
 
@@ -231,7 +241,7 @@ func (is importSet) importPublic(imps protoreflect.FileImports) {
 	}
 }
 
-// NewFiles creates a new protoregistry.Files from the provided
+// NewFiles creates a new [protoregistry.Files] from the provided
 // FileDescriptorSet message. The descriptor set must include only
 // valid files according to protobuf semantics. The returned descriptors
 // are a deep copy of the input.

vendor/google.golang.org/protobuf/reflect/protodesc/desc_init.go

@@ -28,6 +28,7 @@ func (r descsByName) initEnumDeclarations(eds []*descriptorpb.EnumDescriptorProt
 			opts = proto.Clone(opts).(*descriptorpb.EnumOptions)
 			e.L2.Options = func() protoreflect.ProtoMessage { return opts }
 		}
+		e.L1.EditionFeatures = mergeEditionFeatures(parent, ed.GetOptions().GetFeatures())
 		for _, s := range ed.GetReservedName() {
 			e.L2.ReservedNames.List = append(e.L2.ReservedNames.List, protoreflect.Name(s))
 		}
@@ -68,6 +69,7 @@ func (r descsByName) initMessagesDeclarations(mds []*descriptorpb.DescriptorProt
 		if m.L0, err = r.makeBase(m, parent, md.GetName(), i, sb); err != nil {
 			return nil, err
 		}
+		m.L1.EditionFeatures = mergeEditionFeatures(parent, md.GetOptions().GetFeatures())
 		if opts := md.GetOptions(); opts != nil {
 			opts = proto.Clone(opts).(*descriptorpb.MessageOptions)
 			m.L2.Options = func() protoreflect.ProtoMessage { return opts }
@@ -114,6 +116,27 @@ func (r descsByName) initMessagesDeclarations(mds []*descriptorpb.DescriptorProt
 	return ms, nil
 }
 
+// canBePacked returns whether the field can use packed encoding:
+// https://protobuf.dev/programming-guides/encoding/#packed
+func canBePacked(fd *descriptorpb.FieldDescriptorProto) bool {
+	if fd.GetLabel() != descriptorpb.FieldDescriptorProto_LABEL_REPEATED {
+		return false // not a repeated field
+	}
+
+	switch protoreflect.Kind(fd.GetType()) {
+	case protoreflect.MessageKind, protoreflect.GroupKind:
+		return false // not a scalar type field
+
+	case protoreflect.StringKind, protoreflect.BytesKind:
+		// string and bytes can explicitly not be declared as packed,
+		// see https://protobuf.dev/programming-guides/encoding/#packed
+		return false
+
+	default:
+		return true
+	}
+}
+
 func (r descsByName) initFieldsFromDescriptorProto(fds []*descriptorpb.FieldDescriptorProto, parent protoreflect.Descriptor, sb *strs.Builder) (fs []filedesc.Field, err error) {
 	fs = make([]filedesc.Field, len(fds)) // allocate up-front to ensure stable pointers
 	for i, fd := range fds {
@@ -121,13 +144,15 @@ func (r descsByName) initFieldsFromDescriptorProto(fds []*descriptorpb.FieldDesc
 		if f.L0, err = r.makeBase(f, parent, fd.GetName(), i, sb); err != nil {
 			return nil, err
 		}
+		f.L1.EditionFeatures = mergeEditionFeatures(parent, fd.GetOptions().GetFeatures())
 		f.L1.IsProto3Optional = fd.GetProto3Optional()
 		if opts := fd.GetOptions(); opts != nil {
 			opts = proto.Clone(opts).(*descriptorpb.FieldOptions)
 			f.L1.Options = func() protoreflect.ProtoMessage { return opts }
 			f.L1.IsWeak = opts.GetWeak()
-			f.L1.HasPacked = opts.Packed != nil
-			f.L1.IsPacked = opts.GetPacked()
+			if opts.Packed != nil {
+				f.L1.EditionFeatures.IsPacked = opts.GetPacked()
+			}
 		}
 		f.L1.Number = protoreflect.FieldNumber(fd.GetNumber())
 		f.L1.Cardinality = protoreflect.Cardinality(fd.GetLabel())
@@ -137,6 +162,14 @@ func (r descsByName) initFieldsFromDescriptorProto(fds []*descriptorpb.FieldDesc
 		if fd.JsonName != nil {
 			f.L1.StringName.InitJSON(fd.GetJsonName())
 		}
+
+		if f.L1.EditionFeatures.IsLegacyRequired {
+			f.L1.Cardinality = protoreflect.Required
+		}
+
+		if f.L1.Kind == protoreflect.MessageKind && f.L1.EditionFeatures.IsDelimitedEncoded {
+			f.L1.Kind = protoreflect.GroupKind
+		}
 	}
 	return fs, nil
 }
@@ -148,6 +181,7 @@ func (r descsByName) initOneofsFromDescriptorProto(ods []*descriptorpb.OneofDesc
 		if o.L0, err = r.makeBase(o, parent, od.GetName(), i, sb); err != nil {
 			return nil, err
 		}
+		o.L1.EditionFeatures = mergeEditionFeatures(parent, od.GetOptions().GetFeatures())
 		if opts := od.GetOptions(); opts != nil {
 			opts = proto.Clone(opts).(*descriptorpb.OneofOptions)
 			o.L1.Options = func() protoreflect.ProtoMessage { return opts }
@@ -164,10 +198,13 @@ func (r descsByName) initExtensionDeclarations(xds []*descriptorpb.FieldDescript
 		if x.L0, err = r.makeBase(x, parent, xd.GetName(), i, sb); err != nil {
 			return nil, err
 		}
+		x.L1.EditionFeatures = mergeEditionFeatures(parent, xd.GetOptions().GetFeatures())
 		if opts := xd.GetOptions(); opts != nil {
 			opts = proto.Clone(opts).(*descriptorpb.FieldOptions)
 			x.L2.Options = func() protoreflect.ProtoMessage { return opts }
-			x.L2.IsPacked = opts.GetPacked()
+			if opts.Packed != nil {
+				x.L1.EditionFeatures.IsPacked = opts.GetPacked()
+			}
 		}
 		x.L1.Number = protoreflect.FieldNumber(xd.GetNumber())
 		x.L1.Cardinality = protoreflect.Cardinality(xd.GetLabel())

vendor/google.golang.org/protobuf/reflect/protodesc/desc_resolve.go

@@ -276,8 +276,8 @@ func unmarshalDefault(s string, fd protoreflect.FieldDescriptor, allowUnresolvab
 	} else if err != nil {
 		return v, ev, err
 	}
-	if fd.Syntax() == protoreflect.Proto3 {
-		return v, ev, errors.New("cannot be specified under proto3 semantics")
+	if !fd.HasPresence() {
+		return v, ev, errors.New("cannot be specified with implicit field presence")
 	}
 	if fd.Kind() == protoreflect.MessageKind || fd.Kind() == protoreflect.GroupKind || fd.Cardinality() == protoreflect.Repeated {
 		return v, ev, errors.New("cannot be specified on composite types")

vendor/google.golang.org/protobuf/reflect/protodesc/desc_validate.go

@@ -45,11 +45,11 @@ func validateEnumDeclarations(es []filedesc.Enum, eds []*descriptorpb.EnumDescri
 		if allowAlias && !foundAlias {
 			return errors.New("enum %q allows aliases, but none were found", e.FullName())
 		}
-		if e.Syntax() == protoreflect.Proto3 {
+		if !e.IsClosed() {
 			if v := e.Values().Get(0); v.Number() != 0 {
-				return errors.New("enum %q using proto3 semantics must have zero number for the first value", v.FullName())
+				return errors.New("enum %q using open semantics must have zero number for the first value", v.FullName())
 			}
-			// Verify that value names in proto3 do not conflict if the
+			// Verify that value names in open enums do not conflict if the
 			// case-insensitive prefix is removed.
 			// See protoc v3.8.0: src/google/protobuf/descriptor.cc:4991-5055
 			names := map[string]protoreflect.EnumValueDescriptor{}
@@ -58,7 +58,7 @@ func validateEnumDeclarations(es []filedesc.Enum, eds []*descriptorpb.EnumDescri
 				v1 := e.Values().Get(i)
 				s := strs.EnumValueName(strs.TrimEnumPrefix(string(v1.Name()), prefix))
 				if v2, ok := names[s]; ok && v1.Number() != v2.Number() {
-					return errors.New("enum %q using proto3 semantics has conflict: %q with %q", e.FullName(), v1.Name(), v2.Name())
+					return errors.New("enum %q using open semantics has conflict: %q with %q", e.FullName(), v1.Name(), v2.Name())
 				}
 				names[s] = v1
 			}
@@ -80,7 +80,9 @@ func validateEnumDeclarations(es []filedesc.Enum, eds []*descriptorpb.EnumDescri
 	return nil
 }
 
-func validateMessageDeclarations(ms []filedesc.Message, mds []*descriptorpb.DescriptorProto) error {
+func validateMessageDeclarations(file *filedesc.File, ms []filedesc.Message, mds []*descriptorpb.DescriptorProto) error {
+	// There are a few limited exceptions only for proto3
+	isProto3 := file.L1.Edition == fromEditionProto(descriptorpb.Edition_EDITION_PROTO3)
 	for i, md := range mds {
 		m := &ms[i]
 
@@ -107,10 +109,10 @@ func validateMessageDeclarations(ms []filedesc.Message, mds []*descriptorpb.Desc
 		if isMessageSet && !flags.ProtoLegacy {
 			return errors.New("message %q is a MessageSet, which is a legacy proto1 feature that is no longer supported", m.FullName())
 		}
-		if isMessageSet && (m.Syntax() != protoreflect.Proto2 || m.Fields().Len() > 0 || m.ExtensionRanges().Len() == 0) {
+		if isMessageSet && (isProto3 || m.Fields().Len() > 0 || m.ExtensionRanges().Len() == 0) {
 			return errors.New("message %q is an invalid proto1 MessageSet", m.FullName())
 		}
-		if m.Syntax() == protoreflect.Proto3 {
+		if isProto3 {
 			if m.ExtensionRanges().Len() > 0 {
 				return errors.New("message %q using proto3 semantics cannot have extension ranges", m.FullName())
 			}
@@ -149,7 +151,7 @@ func validateMessageDeclarations(ms []filedesc.Message, mds []*descriptorpb.Desc
 				return errors.New("message field %q may not have extendee: %q", f.FullName(), fd.GetExtendee())
 			}
 			if f.L1.IsProto3Optional {
-				if f.Syntax() != protoreflect.Proto3 {
+				if !isProto3 {
 					return errors.New("message field %q under proto3 optional semantics must be specified in the proto3 syntax", f.FullName())
 				}
 				if f.Cardinality() != protoreflect.Optional {
@@ -162,26 +164,29 @@ func validateMessageDeclarations(ms []filedesc.Message, mds []*descriptorpb.Desc
 			if f.IsWeak() && !flags.ProtoLegacy {
 				return errors.New("message field %q is a weak field, which is a legacy proto1 feature that is no longer supported", f.FullName())
 			}
-			if f.IsWeak() && (f.Syntax() != protoreflect.Proto2 || !isOptionalMessage(f) || f.ContainingOneof() != nil) {
+			if f.IsWeak() && (!f.HasPresence() || !isOptionalMessage(f) || f.ContainingOneof() != nil) {
 				return errors.New("message field %q may only be weak for an optional message", f.FullName())
 			}
 			if f.IsPacked() && !isPackable(f) {
 				return errors.New("message field %q is not packable", f.FullName())
 			}
-			if err := checkValidGroup(f); err != nil {
+			if err := checkValidGroup(file, f); err != nil {
 				return errors.New("message field %q is an invalid group: %v", f.FullName(), err)
 			}
 			if err := checkValidMap(f); err != nil {
 				return errors.New("message field %q is an invalid map: %v", f.FullName(), err)
 			}
-			if f.Syntax() == protoreflect.Proto3 {
+			if isProto3 {
 				if f.Cardinality() == protoreflect.Required {
 					return errors.New("message field %q using proto3 semantics cannot be required", f.FullName())
 				}
-				if f.Enum() != nil && !f.Enum().IsPlaceholder() && f.Enum().Syntax() != protoreflect.Proto3 {
-					return errors.New("message field %q using proto3 semantics may only depend on a proto3 enum", f.FullName())
+				if f.Enum() != nil && !f.Enum().IsPlaceholder() && f.Enum().IsClosed() {
+					return errors.New("message field %q using proto3 semantics may only depend on open enums", f.FullName())
 				}
 			}
+			if f.Cardinality() == protoreflect.Optional && !f.HasPresence() && f.Enum() != nil && !f.Enum().IsPlaceholder() && f.Enum().IsClosed() {
+				return errors.New("message field %q with implicit presence may only use open enums", f.FullName())
+			}
 		}
 		seenSynthetic := false // synthetic oneofs for proto3 optional must come after real oneofs
 		for j := range md.GetOneofDecl() {
@@ -215,17 +220,17 @@ func validateMessageDeclarations(ms []filedesc.Message, mds []*descriptorpb.Desc
 		if err := validateEnumDeclarations(m.L1.Enums.List, md.GetEnumType()); err != nil {
 			return err
 		}
-		if err := validateMessageDeclarations(m.L1.Messages.List, md.GetNestedType()); err != nil {
+		if err := validateMessageDeclarations(file, m.L1.Messages.List, md.GetNestedType()); err != nil {
 			return err
 		}
-		if err := validateExtensionDeclarations(m.L1.Extensions.List, md.GetExtension()); err != nil {
+		if err := validateExtensionDeclarations(file, m.L1.Extensions.List, md.GetExtension()); err != nil {
 			return err
 		}
 	}
 	return nil
 }
 
-func validateExtensionDeclarations(xs []filedesc.Extension, xds []*descriptorpb.FieldDescriptorProto) error {
+func validateExtensionDeclarations(f *filedesc.File, xs []filedesc.Extension, xds []*descriptorpb.FieldDescriptorProto) error {
 	for i, xd := range xds {
 		x := &xs[i]
 		// NOTE: Avoid using the IsValid method since extensions to MessageSet
@@ -267,13 +272,13 @@ func validateExtensionDeclarations(xs []filedesc.Extension, xds []*descriptorpb.
 		if x.IsPacked() && !isPackable(x) {
 			return errors.New("extension field %q is not packable", x.FullName())
 		}
-		if err := checkValidGroup(x); err != nil {
+		if err := checkValidGroup(f, x); err != nil {
 			return errors.New("extension field %q is an invalid group: %v", x.FullName(), err)
 		}
 		if md := x.Message(); md != nil && md.IsMapEntry() {
 			return errors.New("extension field %q cannot be a map entry", x.FullName())
 		}
-		if x.Syntax() == protoreflect.Proto3 {
+		if f.L1.Edition == fromEditionProto(descriptorpb.Edition_EDITION_PROTO3) {
 			switch x.ContainingMessage().FullName() {
 			case (*descriptorpb.FileOptions)(nil).ProtoReflect().Descriptor().FullName():
 			case (*descriptorpb.EnumOptions)(nil).ProtoReflect().Descriptor().FullName():
@@ -309,21 +314,25 @@ func isPackable(fd protoreflect.FieldDescriptor) bool {
 
 // checkValidGroup reports whether fd is a valid group according to the same
 // rules that protoc imposes.
-func checkValidGroup(fd protoreflect.FieldDescriptor) error {
+func checkValidGroup(f *filedesc.File, fd protoreflect.FieldDescriptor) error {
 	md := fd.Message()
 	switch {
 	case fd.Kind() != protoreflect.GroupKind:
 		return nil
-	case fd.Syntax() != protoreflect.Proto2:
-		return errors.New("invalid under proto2 semantics")
+	case f.L1.Edition == fromEditionProto(descriptorpb.Edition_EDITION_PROTO3):
+		return errors.New("invalid under proto3 semantics")
 	case md == nil || md.IsPlaceholder():
 		return errors.New("message must be resolvable")
-	case fd.FullName().Parent() != md.FullName().Parent():
-		return errors.New("message and field must be declared in the same scope")
-	case !unicode.IsUpper(rune(md.Name()[0])):
-		return errors.New("message name must start with an uppercase")
-	case fd.Name() != protoreflect.Name(strings.ToLower(string(md.Name()))):
-		return errors.New("field name must be lowercased form of the message name")
+	}
+	if f.L1.Edition < fromEditionProto(descriptorpb.Edition_EDITION_2023) {
+		switch {
+		case fd.FullName().Parent() != md.FullName().Parent():
+			return errors.New("message and field must be declared in the same scope")
+		case !unicode.IsUpper(rune(md.Name()[0])):
+			return errors.New("message name must start with an uppercase")
+		case fd.Name() != protoreflect.Name(strings.ToLower(string(md.Name()))):
+			return errors.New("field name must be lowercased form of the message name")
+		}
 	}
 	return nil
 }

vendor/google.golang.org/protobuf/reflect/protodesc/editions.go

@@ -0,0 +1,145 @@
+// 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 protodesc
+
+import (
+	"fmt"
+	"os"
+	"sync"
+
+	"google.golang.org/protobuf/internal/editiondefaults"
+	"google.golang.org/protobuf/internal/filedesc"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/types/descriptorpb"
+	gofeaturespb "google.golang.org/protobuf/types/gofeaturespb"
+)
+
+var defaults = &descriptorpb.FeatureSetDefaults{}
+var defaultsCacheMu sync.Mutex
+var defaultsCache = make(map[filedesc.Edition]*descriptorpb.FeatureSet)
+
+func init() {
+	err := proto.Unmarshal(editiondefaults.Defaults, defaults)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "unmarshal editions defaults: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func fromEditionProto(epb descriptorpb.Edition) filedesc.Edition {
+	return filedesc.Edition(epb)
+}
+
+func toEditionProto(ed filedesc.Edition) descriptorpb.Edition {
+	switch ed {
+	case filedesc.EditionUnknown:
+		return descriptorpb.Edition_EDITION_UNKNOWN
+	case filedesc.EditionProto2:
+		return descriptorpb.Edition_EDITION_PROTO2
+	case filedesc.EditionProto3:
+		return descriptorpb.Edition_EDITION_PROTO3
+	case filedesc.Edition2023:
+		return descriptorpb.Edition_EDITION_2023
+	default:
+		panic(fmt.Sprintf("unknown value for edition: %v", ed))
+	}
+}
+
+func getFeatureSetFor(ed filedesc.Edition) *descriptorpb.FeatureSet {
+	defaultsCacheMu.Lock()
+	defer defaultsCacheMu.Unlock()
+	if def, ok := defaultsCache[ed]; ok {
+		return def
+	}
+	edpb := toEditionProto(ed)
+	if defaults.GetMinimumEdition() > edpb || defaults.GetMaximumEdition() < edpb {
+		// This should never happen protodesc.(FileOptions).New would fail when
+		// initializing the file descriptor.
+		// This most likely means the embedded defaults were not updated.
+		fmt.Fprintf(os.Stderr, "internal error: unsupported edition %v (did you forget to update the embedded defaults (i.e. the bootstrap descriptor proto)?)\n", edpb)
+		os.Exit(1)
+	}
+	fsed := defaults.GetDefaults()[0]
+	// Using a linear search for now.
+	// Editions are guaranteed to be sorted and thus we could use a binary search.
+	// Given that there are only a handful of editions (with one more per year)
+	// there is not much reason to use a binary search.
+	for _, def := range defaults.GetDefaults() {
+		if def.GetEdition() <= edpb {
+			fsed = def
+		} else {
+			break
+		}
+	}
+	fs := proto.Clone(fsed.GetFixedFeatures()).(*descriptorpb.FeatureSet)
+	proto.Merge(fs, fsed.GetOverridableFeatures())
+	defaultsCache[ed] = fs
+	return fs
+}
+
+// mergeEditionFeatures merges the parent and child feature sets. This function
+// should be used when initializing Go descriptors from descriptor protos which
+// is why the parent is a filedesc.EditionsFeatures (Go representation) while
+// the child is a descriptorproto.FeatureSet (protoc representation).
+// Any feature set by the child overwrites what is set by the parent.
+func mergeEditionFeatures(parentDesc protoreflect.Descriptor, child *descriptorpb.FeatureSet) filedesc.EditionFeatures {
+	var parentFS filedesc.EditionFeatures
+	switch p := parentDesc.(type) {
+	case *filedesc.File:
+		parentFS = p.L1.EditionFeatures
+	case *filedesc.Message:
+		parentFS = p.L1.EditionFeatures
+	default:
+		panic(fmt.Sprintf("unknown parent type %T", parentDesc))
+	}
+	if child == nil {
+		return parentFS
+	}
+	if fp := child.FieldPresence; fp != nil {
+		parentFS.IsFieldPresence = *fp == descriptorpb.FeatureSet_LEGACY_REQUIRED ||
+			*fp == descriptorpb.FeatureSet_EXPLICIT
+		parentFS.IsLegacyRequired = *fp == descriptorpb.FeatureSet_LEGACY_REQUIRED
+	}
+	if et := child.EnumType; et != nil {
+		parentFS.IsOpenEnum = *et == descriptorpb.FeatureSet_OPEN
+	}
+
+	if rfe := child.RepeatedFieldEncoding; rfe != nil {
+		parentFS.IsPacked = *rfe == descriptorpb.FeatureSet_PACKED
+	}
+
+	if utf8val := child.Utf8Validation; utf8val != nil {
+		parentFS.IsUTF8Validated = *utf8val == descriptorpb.FeatureSet_VERIFY
+	}
+
+	if me := child.MessageEncoding; me != nil {
+		parentFS.IsDelimitedEncoded = *me == descriptorpb.FeatureSet_DELIMITED
+	}
+
+	if jf := child.JsonFormat; jf != nil {
+		parentFS.IsJSONCompliant = *jf == descriptorpb.FeatureSet_ALLOW
+	}
+
+	if goFeatures, ok := proto.GetExtension(child, gofeaturespb.E_Go).(*gofeaturespb.GoFeatures); ok && goFeatures != nil {
+		if luje := goFeatures.LegacyUnmarshalJsonEnum; luje != nil {
+			parentFS.GenerateLegacyUnmarshalJSON = *luje
+		}
+	}
+
+	return parentFS
+}
+
+// initFileDescFromFeatureSet initializes editions related fields in fd based
+// on fs. If fs is nil it is assumed to be an empty featureset and all fields
+// will be initialized with the appropriate default. fd.L1.Edition must be set
+// before calling this function.
+func initFileDescFromFeatureSet(fd *filedesc.File, fs *descriptorpb.FeatureSet) {
+	dfs := getFeatureSetFor(fd.L1.Edition)
+	// initialize the featureset with the defaults
+	fd.L1.EditionFeatures = mergeEditionFeatures(fd, dfs)
+	// overwrite any options explicitly specified
+	fd.L1.EditionFeatures = mergeEditionFeatures(fd, fs)
+}

vendor/google.golang.org/protobuf/reflect/protodesc/proto.go

@@ -16,7 +16,7 @@ import (
 	"google.golang.org/protobuf/types/descriptorpb"
 )
 
-// ToFileDescriptorProto copies a protoreflect.FileDescriptor into a
+// ToFileDescriptorProto copies a [protoreflect.FileDescriptor] into a
 // google.protobuf.FileDescriptorProto message.
 func ToFileDescriptorProto(file protoreflect.FileDescriptor) *descriptorpb.FileDescriptorProto {
 	p := &descriptorpb.FileDescriptorProto{
@@ -70,13 +70,23 @@ func ToFileDescriptorProto(file protoreflect.FileDescriptor) *descriptorpb.FileD
 	for i, exts := 0, file.Extensions(); i < exts.Len(); i++ {
 		p.Extension = append(p.Extension, ToFieldDescriptorProto(exts.Get(i)))
 	}
-	if syntax := file.Syntax(); syntax != protoreflect.Proto2 {
+	if syntax := file.Syntax(); syntax != protoreflect.Proto2 && syntax.IsValid() {
 		p.Syntax = proto.String(file.Syntax().String())
 	}
+	if file.Syntax() == protoreflect.Editions {
+		desc := file
+		if fileImportDesc, ok := file.(protoreflect.FileImport); ok {
+			desc = fileImportDesc.FileDescriptor
+		}
+
+		if editionsInterface, ok := desc.(interface{ Edition() int32 }); ok {
+			p.Edition = descriptorpb.Edition(editionsInterface.Edition()).Enum()
+		}
+	}
 	return p
 }
 
-// ToDescriptorProto copies a protoreflect.MessageDescriptor into a
+// ToDescriptorProto copies a [protoreflect.MessageDescriptor] into a
 // google.protobuf.DescriptorProto message.
 func ToDescriptorProto(message protoreflect.MessageDescriptor) *descriptorpb.DescriptorProto {
 	p := &descriptorpb.DescriptorProto{
@@ -119,7 +129,7 @@ func ToDescriptorProto(message protoreflect.MessageDescriptor) *descriptorpb.Des
 	return p
 }
 
-// ToFieldDescriptorProto copies a protoreflect.FieldDescriptor into a
+// ToFieldDescriptorProto copies a [protoreflect.FieldDescriptor] into a
 // google.protobuf.FieldDescriptorProto message.
 func ToFieldDescriptorProto(field protoreflect.FieldDescriptor) *descriptorpb.FieldDescriptorProto {
 	p := &descriptorpb.FieldDescriptorProto{
@@ -153,6 +163,18 @@ func ToFieldDescriptorProto(field protoreflect.FieldDescriptor) *descriptorpb.Fi
 	if field.Syntax() == protoreflect.Proto3 && field.HasOptionalKeyword() {
 		p.Proto3Optional = proto.Bool(true)
 	}
+	if field.Syntax() == protoreflect.Editions {
+		// Editions have no group keyword, this type is only set so that downstream users continue
+		// treating this as delimited encoding.
+		if p.GetType() == descriptorpb.FieldDescriptorProto_TYPE_GROUP {
+			p.Type = descriptorpb.FieldDescriptorProto_TYPE_MESSAGE.Enum()
+		}
+		// Editions have no required keyword, this label is only set so that downstream users continue
+		// treating it as required.
+		if p.GetLabel() == descriptorpb.FieldDescriptorProto_LABEL_REQUIRED {
+			p.Label = descriptorpb.FieldDescriptorProto_LABEL_OPTIONAL.Enum()
+		}
+	}
 	if field.HasDefault() {
 		def, err := defval.Marshal(field.Default(), field.DefaultEnumValue(), field.Kind(), defval.Descriptor)
 		if err != nil && field.DefaultEnumValue() != nil {
@@ -168,7 +190,7 @@ func ToFieldDescriptorProto(field protoreflect.FieldDescriptor) *descriptorpb.Fi
 	return p
 }
 
-// ToOneofDescriptorProto copies a protoreflect.OneofDescriptor into a
+// ToOneofDescriptorProto copies a [protoreflect.OneofDescriptor] into a
 // google.protobuf.OneofDescriptorProto message.
 func ToOneofDescriptorProto(oneof protoreflect.OneofDescriptor) *descriptorpb.OneofDescriptorProto {
 	return &descriptorpb.OneofDescriptorProto{
@@ -177,7 +199,7 @@ func ToOneofDescriptorProto(oneof protoreflect.OneofDescriptor) *descriptorpb.On
 	}
 }
 
-// ToEnumDescriptorProto copies a protoreflect.EnumDescriptor into a
+// ToEnumDescriptorProto copies a [protoreflect.EnumDescriptor] into a
 // google.protobuf.EnumDescriptorProto message.
 func ToEnumDescriptorProto(enum protoreflect.EnumDescriptor) *descriptorpb.EnumDescriptorProto {
 	p := &descriptorpb.EnumDescriptorProto{
@@ -200,7 +222,7 @@ func ToEnumDescriptorProto(enum protoreflect.EnumDescriptor) *descriptorpb.EnumD
 	return p
 }
 
-// ToEnumValueDescriptorProto copies a protoreflect.EnumValueDescriptor into a
+// ToEnumValueDescriptorProto copies a [protoreflect.EnumValueDescriptor] into a
 // google.protobuf.EnumValueDescriptorProto message.
 func ToEnumValueDescriptorProto(value protoreflect.EnumValueDescriptor) *descriptorpb.EnumValueDescriptorProto {
 	return &descriptorpb.EnumValueDescriptorProto{
@@ -210,7 +232,7 @@ func ToEnumValueDescriptorProto(value protoreflect.EnumValueDescriptor) *descrip
 	}
 }
 
-// ToServiceDescriptorProto copies a protoreflect.ServiceDescriptor into a
+// ToServiceDescriptorProto copies a [protoreflect.ServiceDescriptor] into a
 // google.protobuf.ServiceDescriptorProto message.
 func ToServiceDescriptorProto(service protoreflect.ServiceDescriptor) *descriptorpb.ServiceDescriptorProto {
 	p := &descriptorpb.ServiceDescriptorProto{
@@ -223,7 +245,7 @@ func ToServiceDescriptorProto(service protoreflect.ServiceDescriptor) *descripto
 	return p
 }
 
-// ToMethodDescriptorProto copies a protoreflect.MethodDescriptor into a
+// ToMethodDescriptorProto copies a [protoreflect.MethodDescriptor] into a
 // google.protobuf.MethodDescriptorProto message.
 func ToMethodDescriptorProto(method protoreflect.MethodDescriptor) *descriptorpb.MethodDescriptorProto {
 	p := &descriptorpb.MethodDescriptorProto{