cmd/protoc-gen-go: support protobuf retention feature

This change strips out all descriptor option fields marked with [retention = RETENTION_SOURCE] before writing the FileDescriptor to the generated go code bindings.

Change-Id: Ie624d9d4b4f211a256661d80a04199ae8401662b
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/472696
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Lasse Folger <lassefolger@google.com>

8 files changed, 1478 insertions, 1 deletions

diff --git a/cmd/protoc-gen-go/internal_gengo/reflect.go b/cmd/protoc-gen-go/internal_gengo/reflect.go
index 1319a126..0048beb1 100644
--- a/cmd/protoc-gen-go/internal_gengo/reflect.go
+++ b/cmd/protoc-gen-go/internal_gengo/reflect.go
@@ -12,6 +12,8 @@ import (
 
 	"google.golang.org/protobuf/compiler/protogen"
 	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protopath"
+	"google.golang.org/protobuf/reflect/protorange"
 	"google.golang.org/protobuf/reflect/protoreflect"
 
 	"google.golang.org/protobuf/types/descriptorpb"
@@ -233,10 +235,29 @@ func genReflectFileDescriptor(gen *protogen.Plugin, g *protogen.GeneratedFile, f
 	g.P("}")
 }
 
+// stripSourceRetentionFieldsFromMessage walks the given message tree recursively
+// and clears any fields with the field option: [retention = RETENTION_SOURCE]
+func stripSourceRetentionFieldsFromMessage(m protoreflect.Message) {
+	protorange.Range(m, func(ppv protopath.Values) error {
+		m2, ok := ppv.Index(-1).Value.Interface().(protoreflect.Message)
+		if !ok {
+			return nil
+		}
+		m2.Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+			fdo, ok := fd.Options().(*descriptorpb.FieldOptions)
+			if ok && fdo.GetRetention() == descriptorpb.FieldOptions_RETENTION_SOURCE {
+				m2.Clear(fd)
+			}
+			return true
+		})
+		return nil
+	})
+}
+
 func genFileDescriptor(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo) {
 	descProto := proto.Clone(f.Proto).(*descriptorpb.FileDescriptorProto)
 	descProto.SourceCodeInfo = nil // drop source code information
-
+	stripSourceRetentionFieldsFromMessage(descProto.ProtoReflect())
 	b, err := proto.MarshalOptions{AllowPartial: true, Deterministic: true}.Marshal(descProto)
 	if err != nil {
 		gen.Error(err)
diff --git a/cmd/protoc-gen-go/retention_test.go b/cmd/protoc-gen-go/retention_test.go
new file mode 100644
index 00000000..db0b5f3a
--- /dev/null
+++ b/cmd/protoc-gen-go/retention_test.go
@@ -0,0 +1,178 @@
+// 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 main
+
+import (
+	"testing"
+
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+
+	retentionpb "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/retention"
+)
+
+func TestFileOptionRetention(t *testing.T) {
+	options := retentionpb.File_cmd_protoc_gen_go_testdata_retention_retention_proto.Options()
+	tests := []struct {
+		name      string
+		ext       protoreflect.ExtensionType
+		wantField bool
+		wantValue int32
+	}{
+		{
+			name:      "imported_plain_option",
+			ext:       retentionpb.E_ImportedPlainOption,
+			wantField: true,
+			wantValue: 1,
+		},
+		{
+			name:      "imported_runtime_option",
+			ext:       retentionpb.E_ImportedRuntimeRetentionOption,
+			wantField: true,
+			wantValue: 2,
+		},
+		{
+			name:      "imported_source_option",
+			ext:       retentionpb.E_ImportedSourceRetentionOption,
+			wantField: false,
+			wantValue: 0,
+		},
+		{
+			name:      "plain_option",
+			ext:       retentionpb.E_PlainOption,
+			wantField: true,
+			wantValue: 1,
+		},
+		{
+			name:      "runtime_option",
+			ext:       retentionpb.E_RuntimeRetentionOption,
+			wantField: true,
+			wantValue: 2,
+		},
+		{
+			name:      "source_option",
+			ext:       retentionpb.E_SourceRetentionOption,
+			wantField: false,
+			wantValue: 0,
+		},
+	}
+
+	for _, test := range tests {
+		if test.wantField != proto.HasExtension(options, test.ext) {
+			t.Errorf("HasExtension(%s): got %v, want %v", test.name, proto.HasExtension(options, test.ext), test.wantField)
+		}
+		if test.wantValue != proto.GetExtension(options, test.ext).(int32) {
+			t.Errorf("GetExtension(%s): got %d, want %d", test.name, proto.GetExtension(options, test.ext).(int32), test.wantValue)
+		}
+	}
+}
+
+func TestAllEntitiesWithMessageOption(t *testing.T) {
+	file := retentionpb.File_cmd_protoc_gen_go_testdata_retention_retention_proto
+	verifyDescriptorOptions(t, string(file.Name()), file.Options())
+	verifyEnums(t, file.Enums())
+	verifyMessages(t, file.Messages())
+	verifyExtensions(t, file.Extensions())
+	verifyServices(t, file.Services())
+}
+
+func verifyExtensions(t *testing.T, extensions protoreflect.ExtensionDescriptors) {
+	t.Helper()
+	for i := 0; i < extensions.Len(); i++ {
+		verifyDescriptorOptions(t, string(extensions.Get(i).Name()), extensions.Get(i).Options())
+	}
+}
+
+func verifyMessages(t *testing.T, messages protoreflect.MessageDescriptors) {
+	t.Helper()
+	for i := 0; i < messages.Len(); i++ {
+		verifyDescriptorOptions(t, string(messages.Get(i).Name()), messages.Get(i).Options())
+		verifyEnums(t, messages.Get(i).Enums())
+		verifyMessages(t, messages.Get(i).Messages())
+		verifyExtensions(t, messages.Get(i).Extensions())
+		verifyFields(t, messages.Get(i).Fields())
+	}
+}
+
+func verifyFields(t *testing.T, fields protoreflect.FieldDescriptors) {
+	t.Helper()
+	for i := 0; i < fields.Len(); i++ {
+		verifyDescriptorOptions(t, string(fields.Get(i).Name()), fields.Get(i).Options())
+	}
+}
+
+func verifyEnums(t *testing.T, enums protoreflect.EnumDescriptors) {
+	t.Helper()
+	for i := 0; i < enums.Len(); i++ {
+		verifyDescriptorOptions(t, string(enums.Get(i).Name()), enums.Get(i).Options())
+		verifyEnumValues(t, enums.Get(i).Values())
+	}
+}
+
+func verifyEnumValues(t *testing.T, values protoreflect.EnumValueDescriptors) {
+	t.Helper()
+	for i := 0; i < values.Len(); i++ {
+		verifyDescriptorOptions(t, string(values.Get(i).Name()), values.Get(i).Options())
+	}
+}
+
+func verifyServices(t *testing.T, services protoreflect.ServiceDescriptors) {
+	t.Helper()
+	for i := 0; i < services.Len(); i++ {
+		verifyDescriptorOptions(t, string(services.Get(i).Name()), services.Get(i).Options())
+		verifyMethods(t, services.Get(i).Methods())
+	}
+}
+
+func verifyMethods(t *testing.T, methods protoreflect.MethodDescriptors) {
+	t.Helper()
+	for i := 0; i < methods.Len(); i++ {
+		verifyDescriptorOptions(t, string(methods.Get(i).Name()), methods.Get(i).Options())
+	}
+}
+
+func verifyDescriptorOptions(t *testing.T, entity string, options protoreflect.ProtoMessage) {
+	t.Helper()
+	options.ProtoReflect().Range(func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+		maybeVerifyOption(t, fd, v)
+		return true
+	})
+}
+
+func maybeVerifyOption(t *testing.T, fd protoreflect.FieldDescriptor, v protoreflect.Value) {
+	t.Helper()
+	if fd.Kind() == protoreflect.MessageKind && string(fd.Message().FullName()) == "goproto.proto.testretention.OptionsMessage" {
+		if fd.IsList() {
+			for i := 0; i < v.List().Len(); i++ {
+				verifyOptionsMessage(t, string(fd.FullName()), v.List().Get(i).Message().Interface().(*retentionpb.OptionsMessage))
+			}
+		} else {
+			verifyOptionsMessage(t, string(fd.FullName()), v.Message().Interface().(*retentionpb.OptionsMessage))
+		}
+	}
+}
+
+func verifyOptionsMessage(t *testing.T, entity string, msg *retentionpb.OptionsMessage) {
+	t.Helper()
+	if msg.PlainField == nil {
+		t.Errorf("%s.OptionsMessage.HasField(plain_field): got false, want true", entity)
+	}
+	if msg.GetPlainField() != 1 {
+		t.Errorf("%s.OptionsMessage.GetField(plain_field): got %d, want 1", entity, msg.GetPlainField())
+	}
+	if msg.RuntimeRetentionField == nil {
+		t.Errorf("%s.OptionsMessage.HasField(runtime_retention_field): got false, want true", entity)
+	}
+	if msg.GetRuntimeRetentionField() != 2 {
+		t.Errorf("%s.OptionsMessage.GetField(runtime_retention_field): got %d, want 2", entity, msg.GetRuntimeRetentionField())
+	}
+	if msg.SourceRetentionField != nil {
+		t.Errorf("%s.OptionsMessage.HasField(source_retention_field): got true, want false", entity)
+	}
+	if msg.GetSourceRetentionField() != 0 {
+		// Checking that we get 0 even though this was set to 3 in the source file
+		t.Errorf("%s.OptionsMessage.GetField(source_retention_field): got %d, want 0", entity, msg.GetSourceRetentionField())
+	}
+}
diff --git a/cmd/protoc-gen-go/testdata/gen_test.go b/cmd/protoc-gen-go/testdata/gen_test.go
index fa411566..8e7c27a1 100644
--- a/cmd/protoc-gen-go/testdata/gen_test.go
+++ b/cmd/protoc-gen-go/testdata/gen_test.go
@@ -26,4 +26,5 @@ import (
 	_ "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/nopackage"
 	_ "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/proto2"
 	_ "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/proto3"
+	_ "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/retention"
 )
diff --git a/cmd/protoc-gen-go/testdata/retention/options_message.pb.go b/cmd/protoc-gen-go/testdata/retention/options_message.pb.go
new file mode 100755
index 00000000..5b132bf9
--- /dev/null
+++ b/cmd/protoc-gen-go/testdata/retention/options_message.pb.go
@@ -0,0 +1,250 @@
+// Copyright 2020 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.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: cmd/protoc-gen-go/testdata/retention/options_message.proto
+
+package retention
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	descriptorpb "google.golang.org/protobuf/types/descriptorpb"
+	reflect "reflect"
+	sync "sync"
+)
+
+// Retention attributes set on fields nested within a message
+type OptionsMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	PlainField            *int32 `protobuf:"varint,1,opt,name=plain_field,json=plainField" json:"plain_field,omitempty"`
+	RuntimeRetentionField *int32 `protobuf:"varint,2,opt,name=runtime_retention_field,json=runtimeRetentionField" json:"runtime_retention_field,omitempty"`
+	SourceRetentionField  *int32 `protobuf:"varint,3,opt,name=source_retention_field,json=sourceRetentionField" json:"source_retention_field,omitempty"`
+}
+
+func (x *OptionsMessage) Reset() {
+	*x = OptionsMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_cmd_protoc_gen_go_testdata_retention_options_message_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OptionsMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OptionsMessage) ProtoMessage() {}
+
+func (x *OptionsMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_cmd_protoc_gen_go_testdata_retention_options_message_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use OptionsMessage.ProtoReflect.Descriptor instead.
+func (*OptionsMessage) Descriptor() ([]byte, []int) {
+	return file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *OptionsMessage) GetPlainField() int32 {
+	if x != nil && x.PlainField != nil {
+		return *x.PlainField
+	}
+	return 0
+}
+
+func (x *OptionsMessage) GetRuntimeRetentionField() int32 {
+	if x != nil && x.RuntimeRetentionField != nil {
+		return *x.RuntimeRetentionField
+	}
+	return 0
+}
+
+func (x *OptionsMessage) GetSourceRetentionField() int32 {
+	if x != nil && x.SourceRetentionField != nil {
+		return *x.SourceRetentionField
+	}
+	return 0
+}
+
+var file_cmd_protoc_gen_go_testdata_retention_options_message_proto_extTypes = []protoimpl.ExtensionInfo{
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         511807920,
+		Name:          "testretention.imported_plain_option",
+		Tag:           "varint,511807920,opt,name=imported_plain_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/options_message.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         512484074,
+		Name:          "testretention.imported_runtime_retention_option",
+		Tag:           "varint,512484074,opt,name=imported_runtime_retention_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/options_message.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         512645287,
+		Name:          "testretention.imported_source_retention_option",
+		Tag:           "varint,512645287,opt,name=imported_source_retention_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/options_message.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504871168,
+		Name:          "testretention.file_option",
+		Tag:           "bytes,504871168,opt,name=file_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/options_message.proto",
+	},
+}
+
+// Extension fields to descriptorpb.FileOptions.
+var (
+	// optional int32 imported_plain_option = 511807920;
+	E_ImportedPlainOption = &file_cmd_protoc_gen_go_testdata_retention_options_message_proto_extTypes[0]
+	// optional int32 imported_runtime_retention_option = 512484074;
+	E_ImportedRuntimeRetentionOption = &file_cmd_protoc_gen_go_testdata_retention_options_message_proto_extTypes[1]
+	// optional int32 imported_source_retention_option = 512645287;
+	E_ImportedSourceRetentionOption = &file_cmd_protoc_gen_go_testdata_retention_options_message_proto_extTypes[2]
+	// optional testretention.OptionsMessage file_option = 504871168;
+	E_FileOption = &file_cmd_protoc_gen_go_testdata_retention_options_message_proto_extTypes[3]
+)
+
+var File_cmd_protoc_gen_go_testdata_retention_options_message_proto protoreflect.FileDescriptor
+
+var file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDesc = []byte{
+	0x0a, 0x3a, 0x63, 0x6d, 0x64, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2d, 0x67, 0x65, 0x6e,
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+	0x6f, 0x6e, 0x73, 0x18, 0xa7, 0xb1, 0xb9, 0xf4, 0x01, 0x20, 0x01, 0x28, 0x05, 0x42, 0x03, 0x88,
+	0x01, 0x02, 0x52, 0x1d, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x65, 0x64, 0x53, 0x6f, 0x75, 0x72,
+	0x63, 0x65, 0x52, 0x65, 0x74, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x4f, 0x70, 0x74, 0x69, 0x6f,
+	0x6e, 0x3a, 0x60, 0x0a, 0x0b, 0x66, 0x69, 0x6c, 0x65, 0x5f, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e,
+	0x12, 0x1c, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62,
+	0x75, 0x66, 0x2e, 0x46, 0x69, 0x6c, 0x65, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0x80,
+	0xf2, 0xde, 0xf0, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1d, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x72,
+	0x65, 0x74, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73,
+	0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x52, 0x0a, 0x66, 0x69, 0x6c, 0x65, 0x4f, 0x70, 0x74,
+	0x69, 0x6f, 0x6e, 0x42, 0x41, 0x5a, 0x3f, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f,
+	0x6c, 0x61, 0x6e, 0x67, 0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75,
+	0x66, 0x2f, 0x63, 0x6d, 0x64, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2d, 0x67, 0x65, 0x6e,
+	0x2d, 0x67, 0x6f, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x64, 0x61, 0x74, 0x61, 0x2f, 0x72, 0x65, 0x74,
+	0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e,
+}
+
+var (
+	file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescOnce sync.Once
+	file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescData = file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDesc
+)
+
+func file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescGZIP() []byte {
+	file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescOnce.Do(func() {
+		file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescData = protoimpl.X.CompressGZIP(file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescData)
+	})
+	return file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDescData
+}
+
+var file_cmd_protoc_gen_go_testdata_retention_options_message_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_cmd_protoc_gen_go_testdata_retention_options_message_proto_goTypes = []interface{}{
+	(*OptionsMessage)(nil),           // 0: testretention.OptionsMessage
+	(*descriptorpb.FileOptions)(nil), // 1: google.protobuf.FileOptions
+}
+var file_cmd_protoc_gen_go_testdata_retention_options_message_proto_depIdxs = []int32{
+	1, // 0: testretention.imported_plain_option:extendee -> google.protobuf.FileOptions
+	1, // 1: testretention.imported_runtime_retention_option:extendee -> google.protobuf.FileOptions
+	1, // 2: testretention.imported_source_retention_option:extendee -> google.protobuf.FileOptions
+	1, // 3: testretention.file_option:extendee -> google.protobuf.FileOptions
+	0, // 4: testretention.file_option:type_name -> testretention.OptionsMessage
+	5, // [5:5] is the sub-list for method output_type
+	5, // [5:5] is the sub-list for method input_type
+	4, // [4:5] is the sub-list for extension type_name
+	0, // [0:4] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_cmd_protoc_gen_go_testdata_retention_options_message_proto_init() }
+func file_cmd_protoc_gen_go_testdata_retention_options_message_proto_init() {
+	if File_cmd_protoc_gen_go_testdata_retention_options_message_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_cmd_protoc_gen_go_testdata_retention_options_message_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*OptionsMessage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 4,
+			NumServices:   0,
+		},
+		GoTypes:           file_cmd_protoc_gen_go_testdata_retention_options_message_proto_goTypes,
+		DependencyIndexes: file_cmd_protoc_gen_go_testdata_retention_options_message_proto_depIdxs,
+		MessageInfos:      file_cmd_protoc_gen_go_testdata_retention_options_message_proto_msgTypes,
+		ExtensionInfos:    file_cmd_protoc_gen_go_testdata_retention_options_message_proto_extTypes,
+	}.Build()
+	File_cmd_protoc_gen_go_testdata_retention_options_message_proto = out.File
+	file_cmd_protoc_gen_go_testdata_retention_options_message_proto_rawDesc = nil
+	file_cmd_protoc_gen_go_testdata_retention_options_message_proto_goTypes = nil
+	file_cmd_protoc_gen_go_testdata_retention_options_message_proto_depIdxs = nil
+}
diff --git a/cmd/protoc-gen-go/testdata/retention/options_message.proto b/cmd/protoc-gen-go/testdata/retention/options_message.proto
new file mode 100644
index 00000000..afa6cd44
--- /dev/null
+++ b/cmd/protoc-gen-go/testdata/retention/options_message.proto
@@ -0,0 +1,30 @@
+// Copyright 2020 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.
+
+syntax = "proto2";
+
+package testretention;
+
+import "google/protobuf/descriptor.proto";
+
+option go_package = "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/retention";
+
+// Retention attributes set on fields nested within a message
+message OptionsMessage {
+  optional int32 plain_field = 1;
+  optional int32 runtime_retention_field = 2 [retention = RETENTION_RUNTIME];
+  optional int32 source_retention_field = 3 [retention = RETENTION_SOURCE];
+}
+
+extend google.protobuf.FileOptions {
+  optional int32 imported_plain_option = 511807920;
+  optional int32 imported_runtime_retention_option = 512484074
+      [retention = RETENTION_RUNTIME];
+  optional int32 imported_source_retention_option = 512645287
+      [retention = RETENTION_SOURCE];
+}
+
+extend google.protobuf.FileOptions {
+  optional OptionsMessage file_option = 504871168;
+}
\ No newline at end of file
diff --git a/cmd/protoc-gen-go/testdata/retention/retention.pb.go b/cmd/protoc-gen-go/testdata/retention/retention.pb.go
new file mode 100755
index 00000000..f9624b78
--- /dev/null
+++ b/cmd/protoc-gen-go/testdata/retention/retention.pb.go
@@ -0,0 +1,725 @@
+// Copyright 2020 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.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: cmd/protoc-gen-go/testdata/retention/retention.proto
+
+package retention
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	descriptorpb "google.golang.org/protobuf/types/descriptorpb"
+	reflect "reflect"
+	sync "sync"
+)
+
+type TopLevelEnum int32
+
+const (
+	TopLevelEnum_TOP_LEVEL_UNKNOWN TopLevelEnum = 0
+)
+
+// Enum value maps for TopLevelEnum.
+var (
+	TopLevelEnum_name = map[int32]string{
+		0: "TOP_LEVEL_UNKNOWN",
+	}
+	TopLevelEnum_value = map[string]int32{
+		"TOP_LEVEL_UNKNOWN": 0,
+	}
+)
+
+func (x TopLevelEnum) Enum() *TopLevelEnum {
+	p := new(TopLevelEnum)
+	*p = x
+	return p
+}
+
+func (x TopLevelEnum) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (TopLevelEnum) Descriptor() protoreflect.EnumDescriptor {
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_enumTypes[0].Descriptor()
+}
+
+func (TopLevelEnum) Type() protoreflect.EnumType {
+	return &file_cmd_protoc_gen_go_testdata_retention_retention_proto_enumTypes[0]
+}
+
+func (x TopLevelEnum) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *TopLevelEnum) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = TopLevelEnum(num)
+	return nil
+}
+
+// Deprecated: Use TopLevelEnum.Descriptor instead.
+func (TopLevelEnum) EnumDescriptor() ([]byte, []int) {
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescGZIP(), []int{0}
+}
+
+type TopLevelMessage_NestedEnum int32
+
+const (
+	TopLevelMessage_NESTED_UNKNOWN TopLevelMessage_NestedEnum = 0
+)
+
+// Enum value maps for TopLevelMessage_NestedEnum.
+var (
+	TopLevelMessage_NestedEnum_name = map[int32]string{
+		0: "NESTED_UNKNOWN",
+	}
+	TopLevelMessage_NestedEnum_value = map[string]int32{
+		"NESTED_UNKNOWN": 0,
+	}
+)
+
+func (x TopLevelMessage_NestedEnum) Enum() *TopLevelMessage_NestedEnum {
+	p := new(TopLevelMessage_NestedEnum)
+	*p = x
+	return p
+}
+
+func (x TopLevelMessage_NestedEnum) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (TopLevelMessage_NestedEnum) Descriptor() protoreflect.EnumDescriptor {
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_enumTypes[1].Descriptor()
+}
+
+func (TopLevelMessage_NestedEnum) Type() protoreflect.EnumType {
+	return &file_cmd_protoc_gen_go_testdata_retention_retention_proto_enumTypes[1]
+}
+
+func (x TopLevelMessage_NestedEnum) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *TopLevelMessage_NestedEnum) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = TopLevelMessage_NestedEnum(num)
+	return nil
+}
+
+// Deprecated: Use TopLevelMessage_NestedEnum.Descriptor instead.
+func (TopLevelMessage_NestedEnum) EnumDescriptor() ([]byte, []int) {
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescGZIP(), []int{1, 0}
+}
+
+type Extendee struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+}
+
+func (x *Extendee) Reset() {
+	*x = Extendee{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Extendee) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Extendee) ProtoMessage() {}
+
+func (x *Extendee) ProtoReflect() protoreflect.Message {
+	mi := &file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Extendee.ProtoReflect.Descriptor instead.
+func (*Extendee) Descriptor() ([]byte, []int) {
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescGZIP(), []int{0}
+}
+
+type TopLevelMessage struct {
+	state           protoimpl.MessageState
+	sizeCache       protoimpl.SizeCache
+	unknownFields   protoimpl.UnknownFields
+	extensionFields protoimpl.ExtensionFields
+
+	F *float32 `protobuf:"fixed32,1,opt,name=f" json:"f,omitempty"`
+	// Types that are assignable to O:
+	//
+	//	*TopLevelMessage_I
+	O isTopLevelMessage_O `protobuf_oneof:"o"`
+}
+
+func (x *TopLevelMessage) Reset() {
+	*x = TopLevelMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TopLevelMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TopLevelMessage) ProtoMessage() {}
+
+func (x *TopLevelMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TopLevelMessage.ProtoReflect.Descriptor instead.
+func (*TopLevelMessage) Descriptor() ([]byte, []int) {
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *TopLevelMessage) GetF() float32 {
+	if x != nil && x.F != nil {
+		return *x.F
+	}
+	return 0
+}
+
+func (m *TopLevelMessage) GetO() isTopLevelMessage_O {
+	if m != nil {
+		return m.O
+	}
+	return nil
+}
+
+func (x *TopLevelMessage) GetI() int64 {
+	if x, ok := x.GetO().(*TopLevelMessage_I); ok {
+		return x.I
+	}
+	return 0
+}
+
+type isTopLevelMessage_O interface {
+	isTopLevelMessage_O()
+}
+
+type TopLevelMessage_I struct {
+	I int64 `protobuf:"varint,2,opt,name=i,oneof"`
+}
+
+func (*TopLevelMessage_I) isTopLevelMessage_O() {}
+
+type TopLevelMessage_NestedMessage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *TopLevelMessage_NestedMessage) Reset() {
+	*x = TopLevelMessage_NestedMessage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *TopLevelMessage_NestedMessage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TopLevelMessage_NestedMessage) ProtoMessage() {}
+
+func (x *TopLevelMessage_NestedMessage) ProtoReflect() protoreflect.Message {
+	mi := &file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use TopLevelMessage_NestedMessage.ProtoReflect.Descriptor instead.
+func (*TopLevelMessage_NestedMessage) Descriptor() ([]byte, []int) {
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescGZIP(), []int{1, 0}
+}
+
+var file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes = []protoimpl.ExtensionInfo{
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         505092806,
+		Name:          "testretention.plain_option",
+		Tag:           "varint,505092806,opt,name=plain_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         505039132,
+		Name:          "testretention.runtime_retention_option",
+		Tag:           "varint,505039132,opt,name=runtime_retention_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         504878676,
+		Name:          "testretention.source_retention_option",
+		Tag:           "varint,504878676,opt,name=source_retention_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.FileOptions)(nil),
+		ExtensionType: ([]*OptionsMessage)(nil),
+		Field:         504823570,
+		Name:          "testretention.repeated_options",
+		Tag:           "bytes,504823570,rep,name=repeated_options",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.ExtensionRangeOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504822148,
+		Name:          "testretention.extension_range_option",
+		Tag:           "bytes,504822148,opt,name=extension_range_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504820819,
+		Name:          "testretention.message_option",
+		Tag:           "bytes,504820819,opt,name=message_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.FieldOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504589219,
+		Name:          "testretention.field_option",
+		Tag:           "bytes,504589219,opt,name=field_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.OneofOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504479153,
+		Name:          "testretention.oneof_option",
+		Tag:           "bytes,504479153,opt,name=oneof_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.EnumOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504451567,
+		Name:          "testretention.enum_option",
+		Tag:           "bytes,504451567,opt,name=enum_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.EnumValueOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504450522,
+		Name:          "testretention.enum_entry_option",
+		Tag:           "bytes,504450522,opt,name=enum_entry_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.ServiceOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504387709,
+		Name:          "testretention.service_option",
+		Tag:           "bytes,504387709,opt,name=service_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*descriptorpb.MethodOptions)(nil),
+		ExtensionType: (*OptionsMessage)(nil),
+		Field:         504349420,
+		Name:          "testretention.method_option",
+		Tag:           "bytes,504349420,opt,name=method_option",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*Extendee)(nil),
+		ExtensionType: (*int32)(nil),
+		Field:         1,
+		Name:          "testretention.i",
+		Tag:           "varint,1,opt,name=i",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+	{
+		ExtendedType:  (*Extendee)(nil),
+		ExtensionType: (*string)(nil),
+		Field:         2,
+		Name:          "testretention.TopLevelMessage.s",
+		Tag:           "bytes,2,opt,name=s",
+		Filename:      "cmd/protoc-gen-go/testdata/retention/retention.proto",
+	},
+}
+
+// Extension fields to descriptorpb.FileOptions.
+var (
+	// optional int32 plain_option = 505092806;
+	E_PlainOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[0]
+	// optional int32 runtime_retention_option = 505039132;
+	E_RuntimeRetentionOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[1]
+	// optional int32 source_retention_option = 504878676;
+	E_SourceRetentionOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[2]
+	// repeated testretention.OptionsMessage repeated_options = 504823570;
+	E_RepeatedOptions = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[3]
+)
+
+// Extension fields to descriptorpb.ExtensionRangeOptions.
+var (
+	// optional testretention.OptionsMessage extension_range_option = 504822148;
+	E_ExtensionRangeOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[4]
+)
+
+// Extension fields to descriptorpb.MessageOptions.
+var (
+	// optional testretention.OptionsMessage message_option = 504820819;
+	E_MessageOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[5]
+)
+
+// Extension fields to descriptorpb.FieldOptions.
+var (
+	// optional testretention.OptionsMessage field_option = 504589219;
+	E_FieldOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[6]
+)
+
+// Extension fields to descriptorpb.OneofOptions.
+var (
+	// optional testretention.OptionsMessage oneof_option = 504479153;
+	E_OneofOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[7]
+)
+
+// Extension fields to descriptorpb.EnumOptions.
+var (
+	// optional testretention.OptionsMessage enum_option = 504451567;
+	E_EnumOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[8]
+)
+
+// Extension fields to descriptorpb.EnumValueOptions.
+var (
+	// optional testretention.OptionsMessage enum_entry_option = 504450522;
+	E_EnumEntryOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[9]
+)
+
+// Extension fields to descriptorpb.ServiceOptions.
+var (
+	// optional testretention.OptionsMessage service_option = 504387709;
+	E_ServiceOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[10]
+)
+
+// Extension fields to descriptorpb.MethodOptions.
+var (
+	// optional testretention.OptionsMessage method_option = 504349420;
+	E_MethodOption = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[11]
+)
+
+// Extension fields to Extendee.
+var (
+	// optional int32 i = 1;
+	E_I = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[12]
+	// optional string s = 2;
+	E_TopLevelMessage_S = &file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes[13]
+)
+
+var File_cmd_protoc_gen_go_testdata_retention_retention_proto protoreflect.FileDescriptor
+
+var file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDesc = []byte{
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+	0x62, 0x75, 0x66, 0x2e, 0x45, 0x6e, 0x75, 0x6d, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x4f, 0x70, 0x74,
+	0x69, 0x6f, 0x6e, 0x73, 0x18, 0xda, 0x9b, 0xc5, 0xf0, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1d,
+	0x2e, 0x74, 0x65, 0x73, 0x74, 0x72, 0x65, 0x74, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4f,
+	0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x52, 0x0f, 0x65,
+	0x6e, 0x75, 0x6d, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x3a, 0x69,
+	0x0a, 0x0e, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x5f, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e,
+	0x12, 0x1f, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62,
+	0x75, 0x66, 0x2e, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e,
+	0x73, 0x18, 0xfd, 0xb0, 0xc1, 0xf0, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1d, 0x2e, 0x74, 0x65,
+	0x73, 0x74, 0x72, 0x65, 0x74, 0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4f, 0x70, 0x74, 0x69,
+	0x6f, 0x6e, 0x73, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x52, 0x0d, 0x73, 0x65, 0x72, 0x76,
+	0x69, 0x63, 0x65, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x3a, 0x66, 0x0a, 0x0d, 0x6d, 0x65, 0x74,
+	0x68, 0x6f, 0x64, 0x5f, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x1e, 0x2e, 0x67, 0x6f, 0x6f,
+	0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x4d, 0x65, 0x74,
+	0x68, 0x6f, 0x64, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0xec, 0x85, 0xbf, 0xf0, 0x01,
+	0x20, 0x01, 0x28, 0x0b, 0x32, 0x1d, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x72, 0x65, 0x74, 0x65, 0x6e,
+	0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x4d, 0x65, 0x73, 0x73,
+	0x61, 0x67, 0x65, 0x52, 0x0c, 0x6d, 0x65, 0x74, 0x68, 0x6f, 0x64, 0x4f, 0x70, 0x74, 0x69, 0x6f,
+	0x6e, 0x3a, 0x31, 0x0a, 0x01, 0x69, 0x12, 0x17, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x72, 0x65, 0x74,
+	0x65, 0x6e, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x65, 0x65, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x05, 0x42, 0x0a, 0x9a, 0xba, 0xed, 0x84, 0x0f, 0x04, 0x08, 0x01, 0x10,
+	0x02, 0x52, 0x01, 0x69, 0x42, 0x6d, 0x92, 0xf1, 0xdf, 0x85, 0x0f, 0x04, 0x08, 0x01, 0x10, 0x02,
+	0x82, 0x90, 0xf7, 0x85, 0x0f, 0x04, 0x08, 0x01, 0x10, 0x02, 0xe0, 0x91, 0xc9, 0x86, 0x0f, 0x02,
+	0xb0, 0xac, 0xe3, 0x86, 0x0f, 0x01, 0x80, 0x9b, 0xb2, 0xa0, 0x0f, 0x01, 0xd0, 0xae, 0xfc, 0xa2,
+	0x0f, 0x02, 0x5a, 0x3f, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f, 0x6c, 0x61, 0x6e,
+	0x67, 0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x63,
+	0x6d, 0x64, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2d, 0x67, 0x65, 0x6e, 0x2d, 0x67, 0x6f,
+	0x2f, 0x74, 0x65, 0x73, 0x74, 0x64, 0x61, 0x74, 0x61, 0x2f, 0x72, 0x65, 0x74, 0x65, 0x6e, 0x74,
+	0x69, 0x6f, 0x6e,
+}
+
+var (
+	file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescOnce sync.Once
+	file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescData = file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDesc
+)
+
+func file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescGZIP() []byte {
+	file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescOnce.Do(func() {
+		file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescData = protoimpl.X.CompressGZIP(file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescData)
+	})
+	return file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDescData
+}
+
+var file_cmd_protoc_gen_go_testdata_retention_retention_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_cmd_protoc_gen_go_testdata_retention_retention_proto_goTypes = []interface{}{
+	(TopLevelEnum)(0),                          // 0: testretention.TopLevelEnum
+	(TopLevelMessage_NestedEnum)(0),            // 1: testretention.TopLevelMessage.NestedEnum
+	(*Extendee)(nil),                           // 2: testretention.Extendee
+	(*TopLevelMessage)(nil),                    // 3: testretention.TopLevelMessage
+	(*TopLevelMessage_NestedMessage)(nil),      // 4: testretention.TopLevelMessage.NestedMessage
+	(*descriptorpb.FileOptions)(nil),           // 5: google.protobuf.FileOptions
+	(*descriptorpb.ExtensionRangeOptions)(nil), // 6: google.protobuf.ExtensionRangeOptions
+	(*descriptorpb.MessageOptions)(nil),        // 7: google.protobuf.MessageOptions
+	(*descriptorpb.FieldOptions)(nil),          // 8: google.protobuf.FieldOptions
+	(*descriptorpb.OneofOptions)(nil),          // 9: google.protobuf.OneofOptions
+	(*descriptorpb.EnumOptions)(nil),           // 10: google.protobuf.EnumOptions
+	(*descriptorpb.EnumValueOptions)(nil),      // 11: google.protobuf.EnumValueOptions
+	(*descriptorpb.ServiceOptions)(nil),        // 12: google.protobuf.ServiceOptions
+	(*descriptorpb.MethodOptions)(nil),         // 13: google.protobuf.MethodOptions
+	(*OptionsMessage)(nil),                     // 14: testretention.OptionsMessage
+}
+var file_cmd_protoc_gen_go_testdata_retention_retention_proto_depIdxs = []int32{
+	5,  // 0: testretention.plain_option:extendee -> google.protobuf.FileOptions
+	5,  // 1: testretention.runtime_retention_option:extendee -> google.protobuf.FileOptions
+	5,  // 2: testretention.source_retention_option:extendee -> google.protobuf.FileOptions
+	5,  // 3: testretention.repeated_options:extendee -> google.protobuf.FileOptions
+	6,  // 4: testretention.extension_range_option:extendee -> google.protobuf.ExtensionRangeOptions
+	7,  // 5: testretention.message_option:extendee -> google.protobuf.MessageOptions
+	8,  // 6: testretention.field_option:extendee -> google.protobuf.FieldOptions
+	9,  // 7: testretention.oneof_option:extendee -> google.protobuf.OneofOptions
+	10, // 8: testretention.enum_option:extendee -> google.protobuf.EnumOptions
+	11, // 9: testretention.enum_entry_option:extendee -> google.protobuf.EnumValueOptions
+	12, // 10: testretention.service_option:extendee -> google.protobuf.ServiceOptions
+	13, // 11: testretention.method_option:extendee -> google.protobuf.MethodOptions
+	2,  // 12: testretention.i:extendee -> testretention.Extendee
+	2,  // 13: testretention.TopLevelMessage.s:extendee -> testretention.Extendee
+	14, // 14: testretention.repeated_options:type_name -> testretention.OptionsMessage
+	14, // 15: testretention.extension_range_option:type_name -> testretention.OptionsMessage
+	14, // 16: testretention.message_option:type_name -> testretention.OptionsMessage
+	14, // 17: testretention.field_option:type_name -> testretention.OptionsMessage
+	14, // 18: testretention.oneof_option:type_name -> testretention.OptionsMessage
+	14, // 19: testretention.enum_option:type_name -> testretention.OptionsMessage
+	14, // 20: testretention.enum_entry_option:type_name -> testretention.OptionsMessage
+	14, // 21: testretention.service_option:type_name -> testretention.OptionsMessage
+	14, // 22: testretention.method_option:type_name -> testretention.OptionsMessage
+	3,  // 23: testretention.Service.DoStuff:input_type -> testretention.TopLevelMessage
+	3,  // 24: testretention.Service.DoStuff:output_type -> testretention.TopLevelMessage
+	24, // [24:25] is the sub-list for method output_type
+	23, // [23:24] is the sub-list for method input_type
+	14, // [14:23] is the sub-list for extension type_name
+	0,  // [0:14] is the sub-list for extension extendee
+	0,  // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_cmd_protoc_gen_go_testdata_retention_retention_proto_init() }
+func file_cmd_protoc_gen_go_testdata_retention_retention_proto_init() {
+	if File_cmd_protoc_gen_go_testdata_retention_retention_proto != nil {
+		return
+	}
+	file_cmd_protoc_gen_go_testdata_retention_options_message_proto_init()
+	if !protoimpl.UnsafeEnabled {
+		file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Extendee); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TopLevelMessage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			case 3:
+				return &v.extensionFields
+			default:
+				return nil
+			}
+		}
+		file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TopLevelMessage_NestedMessage); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes[1].OneofWrappers = []interface{}{
+		(*TopLevelMessage_I)(nil),
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDesc,
+			NumEnums:      2,
+			NumMessages:   3,
+			NumExtensions: 14,
+			NumServices:   1,
+		},
+		GoTypes:           file_cmd_protoc_gen_go_testdata_retention_retention_proto_goTypes,
+		DependencyIndexes: file_cmd_protoc_gen_go_testdata_retention_retention_proto_depIdxs,
+		EnumInfos:         file_cmd_protoc_gen_go_testdata_retention_retention_proto_enumTypes,
+		MessageInfos:      file_cmd_protoc_gen_go_testdata_retention_retention_proto_msgTypes,
+		ExtensionInfos:    file_cmd_protoc_gen_go_testdata_retention_retention_proto_extTypes,
+	}.Build()
+	File_cmd_protoc_gen_go_testdata_retention_retention_proto = out.File
+	file_cmd_protoc_gen_go_testdata_retention_retention_proto_rawDesc = nil
+	file_cmd_protoc_gen_go_testdata_retention_retention_proto_goTypes = nil
+	file_cmd_protoc_gen_go_testdata_retention_retention_proto_depIdxs = nil
+}
diff --git a/cmd/protoc-gen-go/testdata/retention/retention.proto b/cmd/protoc-gen-go/testdata/retention/retention.proto
new file mode 100644
index 00000000..e409a132
--- /dev/null
+++ b/cmd/protoc-gen-go/testdata/retention/retention.proto
@@ -0,0 +1,176 @@
+// Copyright 2020 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.
+
+syntax = "proto2";
+
+package testretention;
+
+import "cmd/protoc-gen-go/testdata/retention/options_message.proto";
+import "google/protobuf/descriptor.proto";
+
+option go_package = "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/retention";
+
+option (imported_plain_option) = 1;
+option (imported_runtime_retention_option) = 2;
+option (imported_source_retention_option) = 3;
+
+// Retention attributes set directly on custom options
+extend google.protobuf.FileOptions {
+  optional int32 plain_option = 505092806;
+  optional int32 runtime_retention_option = 505039132
+      [retention = RETENTION_RUNTIME];
+  optional int32 source_retention_option = 504878676
+      [retention = RETENTION_SOURCE];
+}
+
+option (plain_option) = 1;
+option (runtime_retention_option) = 2;
+option (source_retention_option) = 3;
+
+option (file_option) = {
+  plain_field: 1
+  runtime_retention_field: 2
+  source_retention_field: 3
+};
+
+// Retention attribute nested inside a repeated message field
+extend google.protobuf.FileOptions {
+  repeated OptionsMessage repeated_options = 504823570;
+}
+
+option (repeated_options) = {
+  plain_field: 1
+  runtime_retention_field: 2
+  source_retention_field: 3
+};
+
+extend google.protobuf.ExtensionRangeOptions {
+  optional OptionsMessage extension_range_option = 504822148;
+}
+
+extend google.protobuf.MessageOptions {
+  optional OptionsMessage message_option = 504820819;
+}
+
+extend google.protobuf.FieldOptions {
+  optional OptionsMessage field_option = 504589219;
+}
+
+extend google.protobuf.OneofOptions {
+  optional OptionsMessage oneof_option = 504479153;
+}
+
+extend google.protobuf.EnumOptions {
+  optional OptionsMessage enum_option = 504451567;
+}
+
+extend google.protobuf.EnumValueOptions {
+  optional OptionsMessage enum_entry_option = 504450522;
+}
+
+extend google.protobuf.ServiceOptions {
+  optional OptionsMessage service_option = 504387709;
+}
+
+extend google.protobuf.MethodOptions {
+  optional OptionsMessage method_option = 504349420;
+}
+
+message Extendee {
+  extensions 1, 2;
+}
+
+extend Extendee {
+  optional int32 i = 1 [(field_option) = {
+    plain_field: 1
+    runtime_retention_field: 2
+    source_retention_field: 3
+  }];
+}
+
+message TopLevelMessage {
+  option (message_option) = {
+    plain_field: 1
+    runtime_retention_field: 2
+    source_retention_field: 3
+  };
+
+  message NestedMessage {
+    option (message_option) = {
+      plain_field: 1
+      runtime_retention_field: 2
+      source_retention_field: 3
+    };
+  }
+
+  enum NestedEnum {
+    option (enum_option) = {
+      plain_field: 1
+      runtime_retention_field: 2
+      source_retention_field: 3
+    };
+
+    NESTED_UNKNOWN = 0;
+  }
+
+  optional float f = 1 [(field_option) = {
+    plain_field: 1
+    runtime_retention_field: 2
+    source_retention_field: 3
+  }];
+
+  oneof o {
+    option (oneof_option) = {
+      plain_field: 1
+      runtime_retention_field: 2
+      source_retention_field: 3
+    };
+
+    int64 i = 2;
+  }
+
+  extensions 10 to 100 [(extension_range_option) = {
+    plain_field: 1
+    runtime_retention_field: 2
+    source_retention_field: 3
+  }];
+
+  extend Extendee {
+    optional string s = 2 [(field_option) = {
+      plain_field: 1
+      runtime_retention_field: 2
+      source_retention_field: 3
+    }];
+  }
+}
+
+enum TopLevelEnum {
+  option (enum_option) = {
+    plain_field: 1
+    runtime_retention_field: 2
+    source_retention_field: 3
+  };
+
+  TOP_LEVEL_UNKNOWN = 0 [(enum_entry_option) = {
+    plain_field: 1
+    runtime_retention_field: 2
+    source_retention_field: 3
+  }];
+}
+
+service Service {
+  option (service_option) = {
+    plain_field: 1
+    runtime_retention_field: 2
+    source_retention_field: 3
+  };
+
+  rpc DoStuff(TopLevelMessage) returns (TopLevelMessage) {
+    option (method_option) = {
+      plain_field: 1
+      runtime_retention_field: 2
+      source_retention_field: 3
+    };
+  }
+}
\ No newline at end of file
diff --git a/compiler/protogen/protogen.go b/compiler/protogen/protogen.go
index 678bf010..2d2171e5 100644
--- a/compiler/protogen/protogen.go
+++ b/compiler/protogen/protogen.go
@@ -36,6 +36,7 @@ import (
 	"google.golang.org/protobuf/reflect/protoregistry"
 
 	"google.golang.org/protobuf/types/descriptorpb"
+	"google.golang.org/protobuf/types/dynamicpb"
 	"google.golang.org/protobuf/types/pluginpb"
 )
 
@@ -209,6 +210,7 @@ func (opts Options) New(req *pluginpb.CodeGeneratorRequest) (*Plugin, error) {
 			}
 		}
 	}
+
 	// When the module= option is provided, we strip the module name
 	// prefix from generated files. This only makes sense if generated
 	// filenames are based on the import path.
@@ -298,6 +300,8 @@ func (opts Options) New(req *pluginpb.CodeGeneratorRequest) (*Plugin, error) {
 		}
 	}
 
+	// The extracted types from the full import set
+	typeRegistry := newExtensionRegistry()
 	for _, fdesc := range gen.Request.ProtoFile {
 		filename := fdesc.GetName()
 		if gen.FilesByPath[filename] != nil {
@@ -309,6 +313,9 @@ func (opts Options) New(req *pluginpb.CodeGeneratorRequest) (*Plugin, error) {
 		}
 		gen.Files = append(gen.Files, f)
 		gen.FilesByPath[filename] = f
+		if err = typeRegistry.registerAllExtensionsFromFile(f.Desc); err != nil {
+			return nil, err
+		}
 	}
 	for _, filename := range gen.Request.FileToGenerate {
 		f, ok := gen.FilesByPath[filename]
@@ -317,6 +324,20 @@ func (opts Options) New(req *pluginpb.CodeGeneratorRequest) (*Plugin, error) {
 		}
 		f.Generate = true
 	}
+
+	// Create fully-linked descriptors if new extensions were found
+	if typeRegistry.hasNovelExtensions() {
+		for _, f := range gen.Files {
+			b, err := proto.Marshal(f.Proto.ProtoReflect().Interface())
+			if err != nil {
+				return nil, err
+			}
+			err = proto.UnmarshalOptions{Resolver: typeRegistry}.Unmarshal(b, f.Proto)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
 	return gen, nil
 }
 
@@ -1259,3 +1280,78 @@ func (c Comments) String() string {
 	}
 	return string(b)
 }
+
+// extensionRegistry allows registration of new extensions defined in the .proto
+// file for which we are generating bindings.
+//
+// Lookups consult the local type registry first and fall back to the base type
+// registry which defaults to protoregistry.GlobalTypes
+type extensionRegistry struct {
+	base  *protoregistry.Types
+	local *protoregistry.Types
+}
+
+func newExtensionRegistry() *extensionRegistry {
+	return &extensionRegistry{
+		base:  protoregistry.GlobalTypes,
+		local: &protoregistry.Types{},
+	}
+}
+
+// FindExtensionByName implements proto.UnmarshalOptions.FindExtensionByName
+func (e *extensionRegistry) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
+	if xt, err := e.local.FindExtensionByName(field); err == nil {
+		return xt, nil
+	}
+
+	return e.base.FindExtensionByName(field)
+}
+
+// FindExtensionByNumber implements proto.UnmarshalOptions.FindExtensionByNumber
+func (e *extensionRegistry) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
+	if xt, err := e.local.FindExtensionByNumber(message, field); err == nil {
+		return xt, nil
+	}
+
+	return e.base.FindExtensionByNumber(message, field)
+}
+
+func (e *extensionRegistry) hasNovelExtensions() bool {
+	return e.local.NumExtensions() > 0
+}
+
+func (e *extensionRegistry) registerAllExtensionsFromFile(f protoreflect.FileDescriptor) error {
+	if err := e.registerAllExtensions(f.Extensions()); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (e *extensionRegistry) registerAllExtensionsFromMessage(ms protoreflect.MessageDescriptors) error {
+	for i := 0; i < ms.Len(); i++ {
+		m := ms.Get(i)
+		if err := e.registerAllExtensions(m.Extensions()); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (e *extensionRegistry) registerAllExtensions(exts protoreflect.ExtensionDescriptors) error {
+	for i := 0; i < exts.Len(); i++ {
+		if err := e.registerExtension(exts.Get(i)); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// registerExtension adds the given extension to the type registry if an
+// extension with that full name does not exist yet.
+func (e *extensionRegistry) registerExtension(xd protoreflect.ExtensionDescriptor) error {
+	if _, err := e.FindExtensionByName(xd.FullName()); err != protoregistry.NotFound {
+		// Either the extension already exists or there was an error, either way we're done.
+		return err
+	}
+	return e.local.RegisterExtension(dynamicpb.NewExtensionType(xd))
+}