all: remove weak field support

Weak fields were the predecessor to extensions (many many years ago) and were
entirely removed from Google’s production usage by now. (The corresponding field
in descriptor.proto was always documented as “// For Google-internal migration
only. Do not use.”)

Before this change, Go Protobuf still contained support for weak fields behind
the `protolegacy` build tag.

The `protolegacy` build tag was always documented as not being part of the
compatibility agreement:

// WARNING: The compatibility agreement covers nothing provided by this flag.
// As such, functionality may suddenly be removed or changed at our discretion.
const ProtoLegacy = protoLegacy

Fixes golang/protobuf#1666

Change-Id: Ie1675424bc80d9f44345ccb96a858ef847ee1018
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/641655
Reviewed-by: Chressie Himpel <chressie@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/protoc-gen-go/annotation_test.go

@@ -56,27 +56,11 @@ func TestAnnotations(t *testing.T) {
 		&descriptorpb.GeneratedCodeInfo_Annotation{
 			Path: []int32{int32(genid.FileDescriptorProto_MessageType_field_number), 0, int32(genid.DescriptorProto_Field_field_number), 0},
 		},
-	}, {
-		"\t", "XXX_weak_M", " ",
-		&descriptorpb.GeneratedCodeInfo_Annotation{
-			Path: []int32{int32(genid.FileDescriptorProto_MessageType_field_number), 0, int32(genid.DescriptorProto_Field_field_number), 1},
-		},
 	}, {
 		"func (x *AnnotationsTestMessage) ", "GetAnnotationsTestField", "() string {",
 		&descriptorpb.GeneratedCodeInfo_Annotation{
 			Path: []int32{int32(genid.FileDescriptorProto_MessageType_field_number), 0, int32(genid.DescriptorProto_Field_field_number), 0},
 		},
-	}, {
-		"func (x *AnnotationsTestMessage) ", "GetM", "() proto.Message {",
-		&descriptorpb.GeneratedCodeInfo_Annotation{
-			Path: []int32{int32(genid.FileDescriptorProto_MessageType_field_number), 0, int32(genid.DescriptorProto_Field_field_number), 1},
-		},
-	}, {
-		"func (x *AnnotationsTestMessage) ", "SetM", "(v proto.Message) {",
-		&descriptorpb.GeneratedCodeInfo_Annotation{
-			Path:     []int32{int32(genid.FileDescriptorProto_MessageType_field_number), 0, int32(genid.DescriptorProto_Field_field_number), 1},
-			Semantic: descriptorpb.GeneratedCodeInfo_Annotation_SET.Enum(),
-		},
 	}} {
 		s := want.prefix + want.text + want.suffix
 		pos := bytes.Index(sourceFile, []byte(s))

cmd/protoc-gen-go/internal_gengo/init.go

@@ -126,7 +126,6 @@ type messageInfo struct {
 
 	isTracked   bool
 	noInterface bool
-	hasWeak     bool
 }
 
 func newMessageInfo(f *fileInfo, message *protogen.Message) *messageInfo {
@@ -134,9 +133,6 @@ func newMessageInfo(f *fileInfo, message *protogen.Message) *messageInfo {
 	m.genRawDescMethod = true
 	m.genExtRangeMethod = true
 	m.isTracked = isTrackedMessage(m)
-	for _, field := range m.Fields {
-		m.hasWeak = m.hasWeak || field.Desc.IsWeak()
-	}
 	opaqueNewMessageInfoHook(f, m)
 	return m
 }

cmd/protoc-gen-go/internal_gengo/main.go

@@ -215,12 +215,10 @@ func genImport(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, imp
 		// Don't generate imports or aliases for types in the same Go package.
 		return
 	}
-	// Generate imports for all non-weak dependencies, even if they are not
+	// Generate imports for all dependencies, even if they are not
 	// referenced, because other code and tools depend on having the
 	// full transitive closure of protocol buffer types in the binary.
-	if !imp.IsWeak {
+	g.Import(impFile.GoImportPath)
-		g.Import(impFile.GoImportPath)
-	}
 	if !imp.IsPublic {
 		return
 	}
@@ -440,10 +438,6 @@ func genMessageInternalFields(g *protogen.GeneratedFile, f *fileInfo, m *message
 	sf.append(genid.State_goname)
 	g.P(genid.SizeCache_goname, " ", protoimplPackage.Ident("SizeCache"))
 	sf.append(genid.SizeCache_goname)
-	if m.hasWeak {
-		g.P(genid.WeakFields_goname, " ", protoimplPackage.Ident("WeakFields"))
-		sf.append(genid.WeakFields_goname)
-	}
 	g.P(genid.UnknownFields_goname, " ", protoimplPackage.Ident("UnknownFields"))
 	sf.append(genid.UnknownFields_goname)
 	if m.Desc.ExtensionRanges().Len() > 0 {
@@ -508,9 +502,6 @@ func genMessageField(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, fie
 	}
 
 	name := field.GoName
-	if field.Desc.IsWeak() {
-		name = genid.WeakFieldPrefix_goname + name
-	}
 	g.AnnotateSymbol(m.GoIdent.GoName+"."+name, protogen.Annotation{Location: field.Location})
 	leadingComments := appendDeprecationSuffix(field.Comments.Leading,
 		field.Desc.ParentFile(),
@@ -590,7 +581,6 @@ func genMessageDefaultDecls(g *protogen.GeneratedFile, f *fileInfo, m *messageIn
 func genMessageMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
 	genMessageBaseMethods(g, f, m)
 	genMessageGetterMethods(g, f, m)
-	genMessageSetterMethods(g, f, m)
 }
 
 func genMessageBaseMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
@@ -655,17 +645,6 @@ func genMessageGetterMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageI
 			field.Desc.ParentFile(),
 			field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
 		switch {
-		case field.Desc.IsWeak():
-			g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", protoPackage.Ident("Message"), "{")
-			g.P("var w ", protoimplPackage.Ident("WeakFields"))
-			g.P("if x != nil {")
-			g.P("w = x.", genid.WeakFields_goname)
-			if m.isTracked {
-				g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
-			}
-			g.P("}")
-			g.P("return ", protoimplPackage.Ident("X"), ".GetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ")")
-			g.P("}")
 		case field.Oneof != nil && !field.Oneof.Desc.IsSynthetic():
 			g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {")
 			g.P("if x, ok := x.Get", field.Oneof.GoName, "().(*", field.GoIdent, "); ok {")
@@ -693,43 +672,10 @@ func genMessageGetterMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageI
 	}
 }
 
-func genMessageSetterMethods(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
-	for _, field := range m.Fields {
-		if !field.Desc.IsWeak() {
-			continue
-		}
-
-		genNoInterfacePragma(g, m.noInterface)
-
-		g.AnnotateSymbol(m.GoIdent.GoName+".Set"+field.GoName, protogen.Annotation{
-			Location: field.Location,
-			Semantic: descriptorpb.GeneratedCodeInfo_Annotation_SET.Enum(),
-		})
-		leadingComments := appendDeprecationSuffix("",
-			field.Desc.ParentFile(),
-			field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
-		g.P(leadingComments, "func (x *", m.GoIdent, ") Set", field.GoName, "(v ", protoPackage.Ident("Message"), ") {")
-		g.P("var w *", protoimplPackage.Ident("WeakFields"))
-		g.P("if x != nil {")
-		g.P("w = &x.", genid.WeakFields_goname)
-		if m.isTracked {
-			g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
-		}
-		g.P("}")
-		g.P(protoimplPackage.Ident("X"), ".SetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ", v)")
-		g.P("}")
-		g.P()
-	}
-}
-
 // fieldGoType returns the Go type used for a field.
 //
 // If it returns pointer=true, the struct field is a pointer to the type.
 func fieldGoType(g *protogen.GeneratedFile, f *fileInfo, field *protogen.Field) (goType string, pointer bool) {
-	if field.Desc.IsWeak() {
-		return "struct{}", false
-	}
-
 	pointer = field.Desc.HasPresence()
 	switch field.Desc.Kind() {
 	case protoreflect.BoolKind:

cmd/protoc-gen-go/internal_gengo/opaque.go

@@ -6,7 +6,6 @@ package internal_gengo
 
 import (
 	"fmt"
-	"strconv"
 	"strings"
 	"unicode"
 	"unicode/utf8"
@@ -109,14 +108,11 @@ func opaqueGenMessageField(g *protogen.GeneratedFile, f *fileInfo, message *mess
 	}
 
 	name := field.GoName
-	if field.Desc.IsWeak() {
+	if message.isOpaque() {
-		g.P("// Deprecated: Do not use. This will be deleted in the near future.")
-		name = genid.WeakFieldPrefix_goname + name
-	} else if message.isOpaque() {
 		name = "xxx_hidden_" + name
 	}
 
-	if message.isOpaque() && !field.Desc.IsWeak() {
+	if message.isOpaque() {
 		g.P(name, " ", goType, tags)
 		sf.append(name)
 		if message.isTracked {
@@ -205,10 +201,6 @@ func opaqueGenMessageInternalFields(g *protogen.GeneratedFile, f *fileInfo, mess
 		g.P("XXX_presence [", (opaqueNumPresenceFields(message)+31)/32, "]uint32")
 		sf.append("XXX_presence")
 	}
-	if message.hasWeak {
-		g.P(genid.WeakFields_goname, " ", protoimplPackage.Ident("WeakFields"))
-		sf.append(genid.WeakFields_goname)
-	}
 	if message.Desc.ExtensionRanges().Len() > 0 {
 		g.P(genid.ExtensionFields_goname, " ", protoimplPackage.Ident("ExtensionFields"))
 		sf.append(genid.ExtensionFields_goname)
@@ -233,8 +225,8 @@ func opaqueGenMessageMethods(g *protogen.GeneratedFile, f *fileInfo, message *me
 		opaqueGenGet(g, f, message, field)
 	}
 	for _, field := range message.Fields {
-		// For the plain open mode, we only have set methods for weak fields.
+		// For the plain open mode, we do not have setters.
-		if message.isOpen() && !field.Desc.IsWeak() {
+		if message.isOpen() {
 			continue
 		}
 		opaqueGenSet(g, f, message, field)
@@ -313,22 +305,6 @@ func opaqueGenGet(g *protogen.GeneratedFile, f *fileInfo, message *messageInfo,
 	fieldtrackNoInterface(g, message.isTracked)
 	g.AnnotateSymbol(message.GoIdent.GoName+"."+getterName, protogen.Annotation{Location: field.Location})
 
-	// Weak field.
-	if field.Desc.IsWeak() {
-		g.P(leadingComments, "func (x *", message.GoIdent, ") ", getterName, "() ", protoPackage.Ident("Message"), "{")
-		g.P("var w ", protoimplPackage.Ident("WeakFields"))
-		g.P("if x != nil {")
-		g.P("w = x.", genid.WeakFields_goname)
-		if message.isTracked {
-			g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
-		}
-		g.P("}")
-		g.P("return ", protoimplPackage.Ident("X"), ".GetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ")")
-		g.P("}")
-		g.P()
-		return
-	}
-
 	defaultValue := fieldDefaultValue(g, f, message, field)
 
 	// Oneof field.
@@ -485,22 +461,6 @@ func opaqueGenSet(g *protogen.GeneratedFile, f *fileInfo, message *messageInfo,
 	})
 	fieldtrackNoInterface(g, message.noInterface)
 
-	// Weak field.
-	if field.Desc.IsWeak() {
-		g.P(leadingComments, "func (x *", message.GoIdent, ") ", setterName, "(v ", protoPackage.Ident("Message"), ") {")
-		g.P("var w *", protoimplPackage.Ident("WeakFields"))
-		g.P("if x != nil {")
-		g.P("w = &x.", genid.WeakFields_goname)
-		if message.isTracked {
-			g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
-		}
-		g.P("}")
-		g.P(protoimplPackage.Ident("X"), ".SetWeak(w, ", field.Desc.Number(), ", ", strconv.Quote(string(field.Message.Desc.FullName())), ", v)")
-		g.P("}")
-		g.P()
-		return
-	}
-
 	// Oneof field.
 	if oneof := field.Oneof; oneof != nil && !oneof.Desc.IsSynthetic() {
 		g.P(leadingComments, "func (x *", message.GoIdent, ") ", setterName, "(v ", goType, ") {")
@@ -610,7 +570,7 @@ func opaqueGenSet(g *protogen.GeneratedFile, f *fileInfo, message *messageInfo,
 // is always true for lazy message types. It is also true for all scalar fields.
 // repeated, map or message fields are not using the presence map.
 func usePresence(message *messageInfo, field *protogen.Field) bool {
-	if !message.isOpaque() || field.Desc.IsWeak() {
+	if !message.isOpaque() {
 		return false
 	}
 	return opaqueFieldNeedsPresenceArray(message, field)
@@ -635,22 +595,6 @@ func opaqueGenHas(g *protogen.GeneratedFile, f *fileInfo, message *messageInfo,
 	g.AnnotateSymbol(message.GoIdent.GoName+"."+hasserName, protogen.Annotation{Location: field.Location})
 	fieldtrackNoInterface(g, message.noInterface)
 
-	// Weak field.
-	if field.Desc.IsWeak() {
-		g.P(leadingComments, "func (x *", message.GoIdent, ") ", hasserName, "() bool {")
-		g.P("var w ", protoimplPackage.Ident("WeakFields"))
-		g.P("if x != nil {")
-		g.P("w = x.", genid.WeakFields_goname)
-		if message.isTracked {
-			g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
-		}
-		g.P("}")
-		g.P("return ", protoimplPackage.Ident("X"), ".HasWeak(w, ", field.Desc.Number(), ")")
-		g.P("}")
-		g.P()
-		return
-	}
-
 	// Oneof field.
 	if oneof := field.Oneof; oneof != nil && !oneof.Desc.IsSynthetic() {
 		g.P(leadingComments, "func (x *", message.GoIdent, ") ", hasserName, "() bool {")
@@ -719,22 +663,6 @@ func opaqueGenClear(g *protogen.GeneratedFile, f *fileInfo, message *messageInfo
 	})
 	fieldtrackNoInterface(g, message.noInterface)
 
-	// Weak field.
-	if field.Desc.IsWeak() {
-		g.P(leadingComments, "func (x *", message.GoIdent, ") ", clearerName, "() {")
-		g.P("var w *", protoimplPackage.Ident("WeakFields"))
-		g.P("if x != nil {")
-		g.P("w = &x.", genid.WeakFields_goname)
-		if message.isTracked {
-			g.P("_ = x.", genid.WeakFieldPrefix_goname+field.GoName)
-		}
-		g.P("}")
-		g.P(protoimplPackage.Ident("X"), ".ClearWeak(w, ", field.Desc.Number(), ")")
-		g.P("}")
-		g.P()
-		return
-	}
-
 	// Oneof field.
 	if oneof := field.Oneof; oneof != nil && !oneof.Desc.IsSynthetic() {
 		g.P(leadingComments, "func (x *", message.GoIdent, ") ", clearerName, "() {")
@@ -937,9 +865,6 @@ func opaqueGenMessageBuilder(g *protogen.GeneratedFile, f *fileInfo, message *me
 	g.P()
 	for _, field := range message.Fields {
 		oneof := field.Oneof
-		if oneof == nil && field.Desc.IsWeak() {
-			continue
-		}
 
 		goType, pointer := opaqueBuilderFieldGoType(g, f, message, field)
 		if pointer {
@@ -1001,9 +926,6 @@ func opaqueGenBuildMethod(g *protogen.GeneratedFile, f *fileInfo, message *messa
 
 	for _, field := range message.Fields {
 		oneof := field.Oneof
-		if oneof == nil && field.Desc.IsWeak() {
-			continue
-		}
 		if oneof != nil && !oneof.Desc.IsSynthetic() {
 			qual := ""
 			if fieldDefaultValue(g, f, message, field) != "nil" {
@@ -1136,10 +1058,6 @@ func opaqueGenOneofWrapperTypes(g *protogen.GeneratedFile, f *fileInfo, message
 //
 // If it returns pointer=true, the struct field is a pointer to the type.
 func opaqueFieldGoType(g *protogen.GeneratedFile, f *fileInfo, message *messageInfo, field *protogen.Field) (goType string, pointer bool) {
-	if field.Desc.IsWeak() {
-		return "struct{}", false
-	}
-
 	pointer = true
 	switch field.Desc.Kind() {
 	case protoreflect.BoolKind:

cmd/protoc-gen-go/internal_gengo/reflect.go

@@ -89,9 +89,6 @@ func genReflectFileDescriptor(gen *protogen.Plugin, g *protogen.GeneratedFile, f
 	depOffsets = append(depOffsets, offsetEntry{len(depIdxs), "field type_name"})
 	for _, message := range f.allMessages {
 		for _, field := range message.Fields {
-			if field.Desc.IsWeak() {
-				continue
-			}
 			source := string(field.Desc.FullName())
 			genEnum(field.Enum, source+":type_name")
 			genMessage(field.Message, source+":type_name")

cmd/protoc-gen-go/testdata/annotations/annotations.pb.go

@@ -8,7 +8,6 @@
 package annotations
 
 import (
-	proto "google.golang.org/protobuf/proto"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -72,11 +71,8 @@ func (AnnotationsTestEnum) EnumDescriptor() ([]byte, []int) {
 type AnnotationsTestMessage struct {
 	state                protoimpl.MessageState `protogen:"open.v1"`
 	AnnotationsTestField *string                `protobuf:"bytes,1,opt,name=AnnotationsTestField" json:"AnnotationsTestField,omitempty"`
-	// Deprecated: Do not use. This will be deleted in the near future.
+	unknownFields        protoimpl.UnknownFields
-	XXX_weak_M    struct{} `protobuf:"bytes,2,opt,name=m,weak=fmt.M" json:"m,omitempty"`
+	sizeCache            protoimpl.SizeCache
-	weakFields    protoimpl.WeakFields
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
 }
 
 func (x *AnnotationsTestMessage) Reset() {
@@ -116,22 +112,6 @@ func (x *AnnotationsTestMessage) GetAnnotationsTestField() string {
 	return ""
 }
 
-func (x *AnnotationsTestMessage) GetM() proto.Message {
-	var w protoimpl.WeakFields
-	if x != nil {
-		w = x.weakFields
-	}
-	return protoimpl.X.GetWeak(w, 2, "fmt.M")
-}
-
-func (x *AnnotationsTestMessage) SetM(v proto.Message) {
-	var w *protoimpl.WeakFields
-	if x != nil {
-		w = &x.weakFields
-	}
-	protoimpl.X.SetWeak(w, 2, "fmt.M", v)
-}
-
 var File_cmd_protoc_gen_go_testdata_annotations_annotations_proto protoreflect.FileDescriptor
 
 var file_cmd_protoc_gen_go_testdata_annotations_annotations_proto_rawDesc = string([]byte{
@@ -140,24 +120,20 @@ var file_cmd_protoc_gen_go_testdata_annotations_annotations_proto_rawDesc = stri
 	0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x2f, 0x61, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74,
 	0x69, 0x6f, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x1a, 0x67, 0x6f, 0x70, 0x72,
 	0x6f, 0x74, 0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2e, 0x61, 0x6e, 0x6e, 0x6f, 0x74,
-	0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x1a, 0x2e, 0x63, 0x6d, 0x64, 0x2f, 0x70, 0x72, 0x6f, 0x74,
+	0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x22, 0x4c, 0x0a, 0x16, 0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61,
-	0x6f, 0x63, 0x2d, 0x67, 0x65, 0x6e, 0x2d, 0x67, 0x6f, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x64, 0x61,
-	0x74, 0x61, 0x2f, 0x69, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x73, 0x2f, 0x66, 0x6d, 0x74, 0x2f, 0x6d,
-	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x66, 0x0a, 0x16, 0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61,
 	0x74, 0x69, 0x6f, 0x6e, 0x73, 0x54, 0x65, 0x73, 0x74, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65,
 	0x12, 0x32, 0x0a, 0x14, 0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x54,
 	0x65, 0x73, 0x74, 0x46, 0x69, 0x65, 0x6c, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x14,
 	0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x54, 0x65, 0x73, 0x74, 0x46,
-	0x69, 0x65, 0x6c, 0x64, 0x12, 0x18, 0x0a, 0x01, 0x6d, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32,
+	0x69, 0x65, 0x6c, 0x64, 0x2a, 0x36, 0x0a, 0x13, 0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69,
-	0x06, 0x2e, 0x66, 0x6d, 0x74, 0x2e, 0x4d, 0x42, 0x02, 0x50, 0x01, 0x52, 0x01, 0x6d, 0x2a, 0x36,
+	0x6f, 0x6e, 0x73, 0x54, 0x65, 0x73, 0x74, 0x45, 0x6e, 0x75, 0x6d, 0x12, 0x1f, 0x0a, 0x1b, 0x41,
-	0x0a, 0x13, 0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x54, 0x65, 0x73,
+	0x4e, 0x4e, 0x4f, 0x54, 0x41, 0x54, 0x49, 0x4f, 0x4e, 0x53, 0x5f, 0x54, 0x45, 0x53, 0x54, 0x5f,
-	0x74, 0x45, 0x6e, 0x75, 0x6d, 0x12, 0x1f, 0x0a, 0x1b, 0x41, 0x4e, 0x4e, 0x4f, 0x54, 0x41, 0x54,
+	0x45, 0x4e, 0x55, 0x4d, 0x5f, 0x56, 0x41, 0x4c, 0x55, 0x45, 0x10, 0x00, 0x42, 0x43, 0x5a, 0x41,
-	0x49, 0x4f, 0x4e, 0x53, 0x5f, 0x54, 0x45, 0x53, 0x54, 0x5f, 0x45, 0x4e, 0x55, 0x4d, 0x5f, 0x56,
+	0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2e, 0x6f, 0x72,
-	0x41, 0x4c, 0x55, 0x45, 0x10, 0x00, 0x42, 0x43, 0x5a, 0x41, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65,
+	0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x63, 0x6d, 0x64, 0x2f, 0x70,
-	0x2e, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x70, 0x72, 0x6f, 0x74,
+	0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2d, 0x67, 0x65, 0x6e, 0x2d, 0x67, 0x6f, 0x2f, 0x74, 0x65, 0x73,
-	0x6f, 0x62, 0x75, 0x66, 0x2f, 0x63, 0x6d, 0x64, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x2d,
+	0x74, 0x64, 0x61, 0x74, 0x61, 0x2f, 0x61, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e,
-	0x67, 0x65, 0x6e, 0x2d, 0x67, 0x6f, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x64, 0x61, 0x74, 0x61, 0x2f,
+	0x73,
-	0x61, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x58, 0x00,
 })
 
 var (

cmd/protoc-gen-go/testdata/annotations/annotations.pb.go.meta

@@ -1 +1 @@
-annotation:{path:5 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:529 end:548} annotation:{path:5 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:565 end:612} annotation:{path:4 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:1971 end:1993} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:2070 end:2090} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:2273 end:2283} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3454 end:3477} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3620 end:3624} annotation:{path:4 path:0 path:2 path:1 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3787 end:3791 semantic:SET}
+annotation:{path:5 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:487 end:506} annotation:{path:5 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:523 end:570} annotation:{path:4 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:1929 end:1951} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:2028 end:2048} annotation:{path:4 path:0 path:2 path:0 source_file:"cmd/protoc-gen-go/testdata/annotations/annotations.proto" begin:3235 end:3258}

cmd/protoc-gen-go/testdata/annotations/annotations.proto

@@ -6,14 +6,10 @@ syntax = "proto2";
 
 package goproto.protoc.annotations;
 
-import weak "cmd/protoc-gen-go/testdata/imports/fmt/m.proto";
-
 option go_package = "google.golang.org/protobuf/cmd/protoc-gen-go/testdata/annotations";
 
 message AnnotationsTestMessage {
   optional string AnnotationsTestField = 1;
-
-  optional fmt.M m = 2 [weak = true];
 }
 
 enum AnnotationsTestEnum {

compiler/protogen/protogen_apilevel.go

@@ -124,25 +124,6 @@ func (field *Field) getterName() (getter, compat string) {
 // setterName returns the (possibly mangled) name of the generated Set method,
 // along with the backwards-compatible name (if needed).
 func (field *Field) setterName() (setter, compat string) {
-	// TODO(b/359846588): remove weak field support?
-	if field.Desc.IsWeak() && field.Parent.APILevel != gofeaturespb.GoFeatures_API_OPAQUE {
-		switch field.Parent.APILevel {
-		case gofeaturespb.GoFeatures_API_OPEN:
-			return "Set" + field.GoName, ""
-
-		default:
-			var infix string
-			if field.hasConflictHybrid {
-				infix = "_"
-			}
-			orig := "Set" + infix + field.camelCase
-			mangled := "Set" + field.GoName
-			if mangled == orig {
-				mangled = ""
-			}
-			return orig, mangled
-		}
-	}
 	return field.methodName("Set"), ""
 }
 

encoding/protojson/decode.go

@@ -192,11 +192,6 @@ func (d decoder) unmarshalMessage(m protoreflect.Message, skipTypeURL bool) erro
 				fd = fieldDescs.ByTextName(name)
 			}
 		}
-		if flags.ProtoLegacyWeak {
-			if fd != nil && fd.IsWeak() && fd.Message().IsPlaceholder() {
-				fd = nil // reset since the weak reference is not linked in
-			}
-		}
 
 		if fd == nil {
 			// Field is unknown.

encoding/protojson/decode_test.go

@@ -16,7 +16,6 @@ import (
 	"google.golang.org/protobuf/reflect/protoregistry"
 
 	testpb "google.golang.org/protobuf/internal/testprotos/test"
-	weakpb "google.golang.org/protobuf/internal/testprotos/test/weak1"
 	pb2 "google.golang.org/protobuf/internal/testprotos/textpb2"
 	pb3 "google.golang.org/protobuf/internal/testprotos/textpb3"
 	pbeditions "google.golang.org/protobuf/internal/testprotos/textpbeditions"
@@ -2675,22 +2674,6 @@ func TestUnmarshal(t *testing.T) {
 				10: 101,
 			},
 		},
-	}, {
-		desc:         "weak fields",
-		inputMessage: &testpb.TestWeak{},
-		inputText:    `{"weak_message1":{"a":1}}`,
-		wantMessage: func() *testpb.TestWeak {
-			m := new(testpb.TestWeak)
-			m.SetWeakMessage1(&weakpb.WeakImportMessage1{A: proto.Int32(1)})
-			return m
-		}(),
-		skip: !flags.ProtoLegacyWeak,
-	}, {
-		desc:         "weak fields; unknown field",
-		inputMessage: &testpb.TestWeak{},
-		inputText:    `{"weak_message1":{"a":1}, "weak_message2":{"a":1}}`,
-		wantErr:      `unknown field "weak_message2"`, // weak_message2 is unknown since the package containing it is not imported
-		skip:         !flags.ProtoLegacyWeak,
 	}, {
 		desc:         "just at recursion limit: nested messages",
 		inputMessage: &testpb.TestAllTypes{},

encoding/prototext/decode.go

@@ -185,11 +185,6 @@ func (d decoder) unmarshalMessage(m protoreflect.Message, checkDelims bool) erro
 		} else if xtErr != nil && xtErr != protoregistry.NotFound {
 			return d.newError(tok.Pos(), "unable to resolve [%s]: %v", tok.RawString(), xtErr)
 		}
-		if flags.ProtoLegacyWeak {
-			if fd != nil && fd.IsWeak() && fd.Message().IsPlaceholder() {
-				fd = nil // reset since the weak reference is not linked in
-			}
-		}
 
 		// Handle unknown fields.
 		if fd == nil {

encoding/prototext/decode_test.go

@@ -16,8 +16,6 @@ import (
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protoregistry"
 
-	testpb "google.golang.org/protobuf/internal/testprotos/test"
-	weakpb "google.golang.org/protobuf/internal/testprotos/test/weak1"
 	pb2 "google.golang.org/protobuf/internal/testprotos/textpb2"
 	pb3 "google.golang.org/protobuf/internal/testprotos/textpb3"
 	pbeditions "google.golang.org/protobuf/internal/testprotos/textpbeditions"
@@ -1616,22 +1614,6 @@ unknown: ""
 type_url: "pb2.Nested"
 `,
 		wantErr: "(line 3:1): conflict with [pb2.Nested] field",
-	}, {
-		desc:         "weak fields",
-		inputMessage: &testpb.TestWeak{},
-		inputText:    `weak_message1:{a:1}`,
-		wantMessage: func() *testpb.TestWeak {
-			m := new(testpb.TestWeak)
-			m.SetWeakMessage1(&weakpb.WeakImportMessage1{A: proto.Int32(1)})
-			return m
-		}(),
-		skip: !flags.ProtoLegacyWeak,
-	}, {
-		desc:         "weak fields; unknown field",
-		inputMessage: &testpb.TestWeak{},
-		inputText:    `weak_message1:{a:1} weak_message2:{a:1}`,
-		wantErr:      "unknown field: weak_message2", // weak_message2 is unknown since the package containing it is not imported
-		skip:         !flags.ProtoLegacyWeak,
 	}}
 
 	for _, msg := range makeMessages(protobuild.Message{},

internal/encoding/tag/tag.go

@@ -26,7 +26,7 @@ var byteType = reflect.TypeOf(byte(0))
 // The type is the underlying field type (e.g., a repeated field may be
 // represented by []T, but the Go type passed in is just T).
 // A list of enum value descriptors must be provided for enum fields.
-// This does not populate the Enum or Message (except for weak message).
+// This does not populate the Enum or Message.
 //
 // This function is a best effort attempt; parsing errors are ignored.
 func Unmarshal(tag string, goType reflect.Type, evs protoreflect.EnumValueDescriptors) protoreflect.FieldDescriptor {
@@ -109,9 +109,6 @@ func Unmarshal(tag string, goType reflect.Type, evs protoreflect.EnumValueDescri
 			}
 		case s == "packed":
 			f.L1.EditionFeatures.IsPacked = true
-		case strings.HasPrefix(s, "weak="):
-			f.L1.IsWeak = true
-			f.L1.Message = filedesc.PlaceholderMessage(protoreflect.FullName(s[len("weak="):]))
 		case strings.HasPrefix(s, "def="):
 			// The default tag is special in that everything afterwards is the
 			// default regardless of the presence of commas.
@@ -183,9 +180,6 @@ func Marshal(fd protoreflect.FieldDescriptor, enumName string) string {
 		// the exact same semantics from the previous generator.
 		tag = append(tag, "json="+jsonName)
 	}
-	if fd.IsWeak() {
-		tag = append(tag, "weak="+string(fd.Message().FullName()))
-	}
 	// The previous implementation does not tag extension fields as proto3,
 	// even when the field is defined in a proto3 file. Match that behavior
 	// for consistency.

internal/filedesc/build_test.go

@@ -15,7 +15,6 @@ import (
 	"google.golang.org/protobuf/reflect/protoreflect"
 
 	testpb "google.golang.org/protobuf/internal/testprotos/test"
-	_ "google.golang.org/protobuf/internal/testprotos/test/weak1"
 	"google.golang.org/protobuf/types/descriptorpb"
 )
 
@@ -57,6 +56,8 @@ func TestInit(t *testing.T) {
 		descPkg.Append("FileDescriptorProto.edition"):            true,
 		descPkg.Append("FileDescriptorProto.edition_enum"):       true,
 		descPkg.Append("FileDescriptorProto.edition_deprecated"): true,
+		// Support for weak fields has been removed.
+		descPkg.Append("FileDescriptorProto.weak_dependency"): true,
 
 		// Impossible to test proto3 optional in a proto2 file.
 		descPkg.Append("FieldDescriptorProto.proto3_optional"): true,
@@ -111,29 +112,3 @@ func visitFields(m protoreflect.Message, f func(protoreflect.FieldDescriptor)) {
 		return true
 	})
 }
-
-func TestWeakInit(t *testing.T) {
-	// We do not expect to get a placeholder since weak1 is imported.
-	fd1 := testFile.Messages().ByName("TestWeak").Fields().ByName("weak_message1")
-	if got, want := fd1.IsWeak(), true; got != want {
-		t.Errorf("field %v: IsWeak() = %v, want %v", fd1.FullName(), got, want)
-	}
-	if got, want := fd1.Message().IsPlaceholder(), false; got != want {
-		t.Errorf("field %v: Message.IsPlaceholder() = %v, want %v", fd1.FullName(), got, want)
-	}
-	if got, want := fd1.Message().Fields().Len(), 1; got != want {
-		t.Errorf("field %v: Message().Fields().Len() == %d, want %d", fd1.FullName(), got, want)
-	}
-
-	// We do expect to get a placeholder since weak2 is not imported.
-	fd2 := testFile.Messages().ByName("TestWeak").Fields().ByName("weak_message2")
-	if got, want := fd2.IsWeak(), true; got != want {
-		t.Errorf("field %v: IsWeak() = %v, want %v", fd2.FullName(), got, want)
-	}
-	if got, want := fd2.Message().IsPlaceholder(), true; got != want {
-		t.Errorf("field %v: Message.IsPlaceholder() = %v, want %v", fd2.FullName(), got, want)
-	}
-	if got, want := fd2.Message().Fields().Len(), 0; got != want {
-		t.Errorf("field %v: Message().Fields().Len() == %d, want %d", fd2.FullName(), got, want)
-	}
-}

internal/filedesc/desc.go

@@ -19,7 +19,6 @@ import (
 	"google.golang.org/protobuf/internal/pragma"
 	"google.golang.org/protobuf/internal/strs"
 	"google.golang.org/protobuf/reflect/protoreflect"
-	"google.golang.org/protobuf/reflect/protoregistry"
 )
 
 // Edition is an Enum for proto2.Edition
@@ -275,7 +274,6 @@ type (
 		Kind             protoreflect.Kind
 		StringName       stringName
 		IsProto3Optional bool // promoted from google.protobuf.FieldDescriptorProto
-		IsWeak           bool // promoted from google.protobuf.FieldOptions
 		IsLazy           bool // promoted from google.protobuf.FieldOptions
 		Default          defaultValue
 		ContainingOneof  protoreflect.OneofDescriptor // must be consistent with Message.Oneofs.Fields
@@ -369,7 +367,7 @@ func (fd *Field) IsPacked() bool {
 	return fd.L1.EditionFeatures.IsPacked
 }
 func (fd *Field) IsExtension() bool { return false }
-func (fd *Field) IsWeak() bool      { return fd.L1.IsWeak }
+func (fd *Field) IsWeak() bool      { return false }
 func (fd *Field) IsLazy() bool      { return fd.L1.IsLazy }
 func (fd *Field) IsList() bool      { return fd.Cardinality() == protoreflect.Repeated && !fd.IsMap() }
 func (fd *Field) IsMap() bool       { return fd.Message() != nil && fd.Message().IsMapEntry() }
@@ -396,11 +394,6 @@ func (fd *Field) Enum() protoreflect.EnumDescriptor {
 	return fd.L1.Enum
 }
 func (fd *Field) Message() protoreflect.MessageDescriptor {
-	if fd.L1.IsWeak {
-		if d, _ := protoregistry.GlobalFiles.FindDescriptorByName(fd.L1.Message.FullName()); d != nil {
-			return d.(protoreflect.MessageDescriptor)
-		}
-	}
 	return fd.L1.Message
 }
 func (fd *Field) IsMapEntry() bool {

internal/filedesc/desc_lazy.go

@@ -32,11 +32,6 @@ func (file *File) resolveMessages() {
 		for j := range md.L2.Fields.List {
 			fd := &md.L2.Fields.List[j]
 
-			// Weak fields are resolved upon actual use.
-			if fd.L1.IsWeak {
-				continue
-			}
-
 			// Resolve message field dependency.
 			switch fd.L1.Kind {
 			case protoreflect.EnumKind:
@@ -150,8 +145,6 @@ func (fd *File) unmarshalFull(b []byte) {
 			switch num {
 			case genid.FileDescriptorProto_PublicDependency_field_number:
 				fd.L2.Imports[v].IsPublic = true
-			case genid.FileDescriptorProto_WeakDependency_field_number:
-				fd.L2.Imports[v].IsWeak = true
 			}
 		case protowire.BytesType:
 			v, m := protowire.ConsumeBytes(b)
@@ -502,8 +495,6 @@ func (fd *Field) unmarshalOptions(b []byte) {
 			switch num {
 			case genid.FieldOptions_Packed_field_number:
 				fd.L1.EditionFeatures.IsPacked = protowire.DecodeBool(v)
-			case genid.FieldOptions_Weak_field_number:
-				fd.L1.IsWeak = protowire.DecodeBool(v)
 			case genid.FieldOptions_Lazy_field_number:
 				fd.L1.IsLazy = protowire.DecodeBool(v)
 			case FieldOptions_EnforceUTF8:

internal/filetype/build.go

@@ -63,7 +63,7 @@ type Builder struct {
 	// message declarations in "flattened ordering".
 	//
 	// Dependencies are Go types for enums or messages referenced by
-	// message fields (excluding weak fields), for parent extended messages of
+	// message fields, for parent extended messages of
 	// extension fields, for enums or messages referenced by extension fields,
 	// and for input and output messages referenced by service methods.
 	// Dependencies must come after declarations, but the ordering of

internal/flags/flags.go

@@ -6,7 +6,7 @@
 package flags
 
 // ProtoLegacy specifies whether to enable support for legacy functionality
-// such as MessageSets, weak fields, and various other obscure behavior
+// such as MessageSets, and various other obscure behavior
 // that is necessary to maintain backwards compatibility with proto1 or
 // the pre-release variants of proto2 and proto3.
 //
@@ -22,8 +22,3 @@ const ProtoLegacy = protoLegacy
 // extension fields at unmarshal time, but defers creating the message
 // structure until the extension is first accessed.
 const LazyUnmarshalExtensions = ProtoLegacy
-
-// ProtoLegacyWeak specifies whether to enable support for weak fields.
-// This flag was split out of ProtoLegacy in preparation for removing
-// support for weak fields (independent of the other protolegacy features).
-const ProtoLegacyWeak = ProtoLegacy

internal/genid/goname.go

@@ -11,15 +11,10 @@ const (
 	SizeCache_goname  = "sizeCache"
 	SizeCacheA_goname = "XXX_sizecache"
 
-	WeakFields_goname  = "weakFields"
-	WeakFieldsA_goname = "XXX_weak"
-
 	UnknownFields_goname  = "unknownFields"
 	UnknownFieldsA_goname = "XXX_unrecognized"
 
 	ExtensionFields_goname  = "extensionFields"
 	ExtensionFieldsA_goname = "XXX_InternalExtensions"
 	ExtensionFieldsB_goname = "XXX_extensions"
-
-	WeakFieldPrefix_goname = "XXX_weak_"
 )

internal/impl/codec_field.go

@@ -5,15 +5,12 @@
 package impl
 
 import (
-	"fmt"
 	"reflect"
-	"sync"
 
 	"google.golang.org/protobuf/encoding/protowire"
 	"google.golang.org/protobuf/internal/errors"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protoreflect"
-	"google.golang.org/protobuf/reflect/protoregistry"
 	"google.golang.org/protobuf/runtime/protoiface"
 )
 
@@ -121,78 +118,6 @@ func (mi *MessageInfo) initOneofFieldCoders(od protoreflect.OneofDescriptor, si
 	}
 }
 
-func makeWeakMessageFieldCoder(fd protoreflect.FieldDescriptor) pointerCoderFuncs {
-	var once sync.Once
-	var messageType protoreflect.MessageType
-	lazyInit := func() {
-		once.Do(func() {
-			messageName := fd.Message().FullName()
-			messageType, _ = protoregistry.GlobalTypes.FindMessageByName(messageName)
-		})
-	}
-
-	return pointerCoderFuncs{
-		size: func(p pointer, f *coderFieldInfo, opts marshalOptions) int {
-			m, ok := p.WeakFields().get(f.num)
-			if !ok {
-				return 0
-			}
-			lazyInit()
-			if messageType == nil {
-				panic(fmt.Sprintf("weak message %v is not linked in", fd.Message().FullName()))
-			}
-			return sizeMessage(m, f.tagsize, opts)
-		},
-		marshal: func(b []byte, p pointer, f *coderFieldInfo, opts marshalOptions) ([]byte, error) {
-			m, ok := p.WeakFields().get(f.num)
-			if !ok {
-				return b, nil
-			}
-			lazyInit()
-			if messageType == nil {
-				panic(fmt.Sprintf("weak message %v is not linked in", fd.Message().FullName()))
-			}
-			return appendMessage(b, m, f.wiretag, opts)
-		},
-		unmarshal: func(b []byte, p pointer, wtyp protowire.Type, f *coderFieldInfo, opts unmarshalOptions) (unmarshalOutput, error) {
-			fs := p.WeakFields()
-			m, ok := fs.get(f.num)
-			if !ok {
-				lazyInit()
-				if messageType == nil {
-					return unmarshalOutput{}, errUnknown
-				}
-				m = messageType.New().Interface()
-				fs.set(f.num, m)
-			}
-			return consumeMessage(b, m, wtyp, opts)
-		},
-		isInit: func(p pointer, f *coderFieldInfo) error {
-			m, ok := p.WeakFields().get(f.num)
-			if !ok {
-				return nil
-			}
-			return proto.CheckInitialized(m)
-		},
-		merge: func(dst, src pointer, f *coderFieldInfo, opts mergeOptions) {
-			sm, ok := src.WeakFields().get(f.num)
-			if !ok {
-				return
-			}
-			dm, ok := dst.WeakFields().get(f.num)
-			if !ok {
-				lazyInit()
-				if messageType == nil {
-					panic(fmt.Sprintf("weak message %v is not linked in", fd.Message().FullName()))
-				}
-				dm = messageType.New().Interface()
-				dst.WeakFields().set(f.num, dm)
-			}
-			opts.Merge(dm, sm)
-		},
-	}
-}
-
 func makeMessageFieldCoder(fd protoreflect.FieldDescriptor, ft reflect.Type) pointerCoderFuncs {
 	if mi := getMessageInfo(ft); mi != nil {
 		funcs := pointerCoderFuncs{

internal/impl/codec_message.go

@@ -119,9 +119,6 @@ func (mi *MessageInfo) makeCoderMethods(t reflect.Type, si structInfo) {
 			}
 		case isOneof:
 			fieldOffset = offsetOf(fs)
-		case fd.IsWeak():
-			fieldOffset = si.weakOffset
-			funcs = makeWeakMessageFieldCoder(fd)
 		default:
 			fieldOffset = offsetOf(fs)
 			childMessage, funcs = fieldCoder(fd, ft)

internal/impl/codec_message_opaque.go

@@ -46,9 +46,6 @@ func (mi *MessageInfo) makeOpaqueCoderMethods(t reflect.Type, si opaqueStructInf
 		switch {
 		case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
 			fieldOffset = offsetOf(fs)
-		case fd.IsWeak():
-			fieldOffset = si.weakOffset
-			funcs = makeWeakMessageFieldCoder(fd)
 		case fd.Message() != nil && !fd.IsMap():
 			fieldOffset = offsetOf(fs)
 			if fd.IsList() {

internal/impl/lazy.go

@@ -131,7 +131,7 @@ func (mi *MessageInfo) skipField(b []byte, f *coderFieldInfo, wtyp protowire.Typ
 	fmi := f.validation.mi
 	if fmi == nil {
 		fd := mi.Desc.Fields().ByNumber(f.num)
-		if fd == nil || !fd.IsWeak() {
+		if fd == nil {
 			return out, ValidationUnknown
 		}
 		messageName := fd.Message().FullName()

internal/impl/legacy_message.go

@@ -310,12 +310,9 @@ func aberrantAppendField(md *filedesc.Message, goType reflect.Type, tag, tagKey,
 	fd.L0.Parent = md
 	fd.L0.Index = n
 
-	if fd.L1.IsWeak || fd.L1.EditionFeatures.IsPacked {
+	if fd.L1.EditionFeatures.IsPacked {
 		fd.L1.Options = func() protoreflect.ProtoMessage {
 			opts := descopts.Field.ProtoReflect().New()
-			if fd.L1.IsWeak {
-				opts.Set(opts.Descriptor().Fields().ByName("weak"), protoreflect.ValueOfBool(true))
-			}
 			if fd.L1.EditionFeatures.IsPacked {
 				opts.Set(opts.Descriptor().Fields().ByName("packed"), protoreflect.ValueOfBool(fd.L1.EditionFeatures.IsPacked))
 			}

internal/impl/message.go

@@ -14,7 +14,6 @@ import (
 
 	"google.golang.org/protobuf/internal/genid"
 	"google.golang.org/protobuf/reflect/protoreflect"
-	"google.golang.org/protobuf/reflect/protoregistry"
 )
 
 // MessageInfo provides protobuf related functionality for a given Go type
@@ -120,7 +119,6 @@ type (
 
 var (
 	sizecacheType       = reflect.TypeOf(SizeCache(0))
-	weakFieldsType      = reflect.TypeOf(WeakFields(nil))
 	unknownFieldsAType  = reflect.TypeOf(unknownFieldsA(nil))
 	unknownFieldsBType  = reflect.TypeOf(unknownFieldsB(nil))
 	extensionFieldsType = reflect.TypeOf(ExtensionFields(nil))
@@ -129,8 +127,6 @@ var (
 type structInfo struct {
 	sizecacheOffset offset
 	sizecacheType   reflect.Type
-	weakOffset      offset
-	weakType        reflect.Type
 	unknownOffset   offset
 	unknownType     reflect.Type
 	extensionOffset offset
@@ -148,7 +144,6 @@ type structInfo struct {
 func (mi *MessageInfo) makeStructInfo(t reflect.Type) structInfo {
 	si := structInfo{
 		sizecacheOffset: invalidOffset,
-		weakOffset:      invalidOffset,
 		unknownOffset:   invalidOffset,
 		extensionOffset: invalidOffset,
 		lazyOffset:      invalidOffset,
@@ -168,11 +163,6 @@ fieldLoop:
 				si.sizecacheOffset = offsetOf(f)
 				si.sizecacheType = f.Type
 			}
-		case genid.WeakFields_goname, genid.WeakFieldsA_goname:
-			if f.Type == weakFieldsType {
-				si.weakOffset = offsetOf(f)
-				si.weakType = f.Type
-			}
 		case genid.UnknownFields_goname, genid.UnknownFieldsA_goname:
 			if f.Type == unknownFieldsAType || f.Type == unknownFieldsBType {
 				si.unknownOffset = offsetOf(f)
@@ -256,9 +246,6 @@ func (mi *MessageInfo) Message(i int) protoreflect.MessageType {
 	mi.init()
 	fd := mi.Desc.Fields().Get(i)
 	switch {
-	case fd.IsWeak():
-		mt, _ := protoregistry.GlobalTypes.FindMessageByName(fd.Message().FullName())
-		return mt
 	case fd.IsMap():
 		return mapEntryType{fd.Message(), mi.fieldTypes[fd.Number()]}
 	default:

internal/impl/message_opaque.go

@@ -56,9 +56,6 @@ func opaqueInitHook(mi *MessageInfo) bool {
 		usePresence, _ := usePresenceForField(si, fd)
 
 		switch {
-		case fd.IsWeak():
-			// Weak fields are no different for opaque.
-			fi = fieldInfoForWeakMessage(fd, si.weakOffset)
 		case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
 			// Oneofs are no different for opaque.
 			fi = fieldInfoForOneof(fd, si.oneofsByName[fd.ContainingOneof().Name()], mi.Exporter, si.oneofWrappersByNumber[fd.Number()])
@@ -620,8 +617,6 @@ func usePresenceForField(si opaqueStructInfo, fd protoreflect.FieldDescriptor) (
 	switch {
 	case fd.ContainingOneof() != nil && !fd.ContainingOneof().IsSynthetic():
 		return false, false
-	case fd.IsWeak():
-		return false, false
 	case fd.IsMap():
 		return false, false
 	case fd.Kind() == protoreflect.MessageKind || fd.Kind() == protoreflect.GroupKind:

internal/impl/message_reflect.go

@@ -72,8 +72,6 @@ func (mi *MessageInfo) makeKnownFieldsFunc(si structInfo) {
 			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:
@@ -219,9 +217,6 @@ func (mi *MessageInfo) makeFieldTypes(si structInfo) {
 			}
 		case fd.Message() != nil:
 			ft = fs.Type
-			if fd.IsWeak() {
-				ft = nil
-			}
 			isMessage = true
 		}
 		if isMessage && ft != nil && ft.Kind() != reflect.Ptr {

internal/impl/message_reflect_field.go

@@ -8,11 +8,8 @@ import (
 	"fmt"
 	"math"
 	"reflect"
-	"sync"
 
-	"google.golang.org/protobuf/internal/flags"
 	"google.golang.org/protobuf/reflect/protoreflect"
-	"google.golang.org/protobuf/reflect/protoregistry"
 )
 
 type fieldInfo struct {
@@ -332,79 +329,6 @@ func fieldInfoForScalar(fd protoreflect.FieldDescriptor, fs reflect.StructField,
 	}
 }
 
-func fieldInfoForWeakMessage(fd protoreflect.FieldDescriptor, weakOffset offset) fieldInfo {
-	if !flags.ProtoLegacyWeak {
-		panic("no support for proto1 weak fields")
-	}
-
-	var once sync.Once
-	var messageType protoreflect.MessageType
-	lazyInit := func() {
-		once.Do(func() {
-			messageName := fd.Message().FullName()
-			messageType, _ = protoregistry.GlobalTypes.FindMessageByName(messageName)
-			if messageType == nil {
-				panic(fmt.Sprintf("weak message %v for field %v is not linked in", messageName, fd.FullName()))
-			}
-		})
-	}
-
-	num := fd.Number()
-	return fieldInfo{
-		fieldDesc: fd,
-		has: func(p pointer) bool {
-			if p.IsNil() {
-				return false
-			}
-			_, ok := p.Apply(weakOffset).WeakFields().get(num)
-			return ok
-		},
-		clear: func(p pointer) {
-			p.Apply(weakOffset).WeakFields().clear(num)
-		},
-		get: func(p pointer) protoreflect.Value {
-			lazyInit()
-			if p.IsNil() {
-				return protoreflect.ValueOfMessage(messageType.Zero())
-			}
-			m, ok := p.Apply(weakOffset).WeakFields().get(num)
-			if !ok {
-				return protoreflect.ValueOfMessage(messageType.Zero())
-			}
-			return protoreflect.ValueOfMessage(m.ProtoReflect())
-		},
-		set: func(p pointer, v protoreflect.Value) {
-			lazyInit()
-			m := v.Message()
-			if m.Descriptor() != messageType.Descriptor() {
-				if got, want := m.Descriptor().FullName(), messageType.Descriptor().FullName(); got != want {
-					panic(fmt.Sprintf("field %v has mismatching message descriptor: got %v, want %v", fd.FullName(), got, want))
-				}
-				panic(fmt.Sprintf("field %v has mismatching message descriptor: %v", fd.FullName(), m.Descriptor().FullName()))
-			}
-			p.Apply(weakOffset).WeakFields().set(num, m.Interface())
-		},
-		mutable: func(p pointer) protoreflect.Value {
-			lazyInit()
-			fs := p.Apply(weakOffset).WeakFields()
-			m, ok := fs.get(num)
-			if !ok {
-				m = messageType.New().Interface()
-				fs.set(num, m)
-			}
-			return protoreflect.ValueOfMessage(m.ProtoReflect())
-		},
-		newMessage: func() protoreflect.Message {
-			lazyInit()
-			return messageType.New()
-		},
-		newField: func() protoreflect.Value {
-			lazyInit()
-			return protoreflect.ValueOfMessage(messageType.New())
-		},
-	}
-}
-
 func fieldInfoForMessage(fd protoreflect.FieldDescriptor, fs reflect.StructField, x exporter) fieldInfo {
 	ft := fs.Type
 	conv := NewConverter(ft, fd)

internal/impl/pointer_unsafe.go

@@ -111,7 +111,6 @@ func (p pointer) StringSlice() *[]string                { return (*[]string)(p.p
 func (p pointer) Bytes() *[]byte                        { return (*[]byte)(p.p) }
 func (p pointer) BytesPtr() **[]byte                    { return (**[]byte)(p.p) }
 func (p pointer) BytesSlice() *[][]byte                 { return (*[][]byte)(p.p) }
-func (p pointer) WeakFields() *weakFields               { return (*weakFields)(p.p) }
 func (p pointer) Extensions() *map[int32]ExtensionField { return (*map[int32]ExtensionField)(p.p) }
 func (p pointer) LazyInfoPtr() **protolazy.XXX_lazyUnmarshalInfo {
 	return (**protolazy.XXX_lazyUnmarshalInfo)(p.p)

internal/impl/validate.go

@@ -211,9 +211,7 @@ func newValidationInfo(fd protoreflect.FieldDescriptor, ft reflect.Type) validat
 		switch fd.Kind() {
 		case protoreflect.MessageKind:
 			vi.typ = validationTypeMessage
-			if !fd.IsWeak() {
+			vi.mi = getMessageInfo(ft)
-				vi.mi = getMessageInfo(ft)
-			}
 		case protoreflect.GroupKind:
 			vi.typ = validationTypeGroup
 			vi.mi = getMessageInfo(ft)
@@ -320,26 +318,6 @@ State:
 				}
 				if f != nil {
 					vi = f.validation
-					if vi.typ == validationTypeMessage && vi.mi == nil {
-						// Probable weak field.
-						//
-						// TODO: Consider storing the results of this lookup somewhere
-						// rather than recomputing it on every validation.
-						fd := st.mi.Desc.Fields().ByNumber(num)
-						if fd == nil || !fd.IsWeak() {
-							break
-						}
-						messageName := fd.Message().FullName()
-						messageType, err := protoregistry.GlobalTypes.FindMessageByName(messageName)
-						switch err {
-						case nil:
-							vi.mi, _ = messageType.(*MessageInfo)
-						case protoregistry.NotFound:
-							vi.typ = validationTypeBytes
-						default:
-							return out, ValidationUnknown
-						}
-					}
 					break
 				}
 				// Possible extension field.

internal/impl/weak.go

@@ -1,74 +0,0 @@
-// 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"
-
-	"google.golang.org/protobuf/reflect/protoreflect"
-	"google.golang.org/protobuf/reflect/protoregistry"
-)
-
-// weakFields adds methods to the exported WeakFields type for internal use.
-//
-// The exported type is an alias to an unnamed type, so methods can't be
-// defined directly on it.
-type weakFields WeakFields
-
-func (w weakFields) get(num protoreflect.FieldNumber) (protoreflect.ProtoMessage, bool) {
-	m, ok := w[int32(num)]
-	return m, ok
-}
-
-func (w *weakFields) set(num protoreflect.FieldNumber, m protoreflect.ProtoMessage) {
-	if *w == nil {
-		*w = make(weakFields)
-	}
-	(*w)[int32(num)] = m
-}
-
-func (w *weakFields) clear(num protoreflect.FieldNumber) {
-	delete(*w, int32(num))
-}
-
-func (Export) HasWeak(w WeakFields, num protoreflect.FieldNumber) bool {
-	_, ok := w[int32(num)]
-	return ok
-}
-
-func (Export) ClearWeak(w *WeakFields, num protoreflect.FieldNumber) {
-	delete(*w, int32(num))
-}
-
-func (Export) GetWeak(w WeakFields, num protoreflect.FieldNumber, name protoreflect.FullName) protoreflect.ProtoMessage {
-	if m, ok := w[int32(num)]; ok {
-		return m
-	}
-	mt, _ := protoregistry.GlobalTypes.FindMessageByName(name)
-	if mt == nil {
-		panic(fmt.Sprintf("message %v for weak field is not linked in", name))
-	}
-	return mt.Zero().Interface()
-}
-
-func (Export) SetWeak(w *WeakFields, num protoreflect.FieldNumber, name protoreflect.FullName, m protoreflect.ProtoMessage) {
-	if m != nil {
-		mt, _ := protoregistry.GlobalTypes.FindMessageByName(name)
-		if mt == nil {
-			panic(fmt.Sprintf("message %v for weak field is not linked in", name))
-		}
-		if mt != m.ProtoReflect().Type() {
-			panic(fmt.Sprintf("invalid message type for weak field: got %T, want %T", m, mt.Zero().Interface()))
-		}
-	}
-	if m == nil || !m.ProtoReflect().IsValid() {
-		delete(*w, int32(num))
-		return
-	}
-	if *w == nil {
-		*w = make(weakFields)
-	}
-	(*w)[int32(num)] = m
-}

internal/testprotos/fieldtrack/fieldtrack.pb.go

@@ -10,7 +10,6 @@ package fieldtrack
 import (
 	_ "google.golang.org/protobuf/internal/testprotos/annotation"
 	test "google.golang.org/protobuf/internal/testprotos/test"
-	proto "google.golang.org/protobuf/proto"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -71,13 +70,8 @@ type TestFieldTrack struct {
 	MapStringBytes    map[string][]byte                           `protobuf:"bytes,55,rep,name=map_string_bytes,json=mapStringBytes" json:"map_string_bytes,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value" go:"track"`
 	MapStringEnum     map[string]test.TestAllTypes_NestedEnum     `protobuf:"bytes,56,rep,name=map_string_enum,json=mapStringEnum" json:"map_string_enum,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"varint,2,opt,name=value,enum=goproto.proto.test.TestAllTypes_NestedEnum" go:"track"`
 	MapStringMessage  map[string]*test.TestAllTypes_NestedMessage `protobuf:"bytes,57,rep,name=map_string_message,json=mapStringMessage" json:"map_string_message,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value" go:"track"`
-	// Deprecated: Do not use. This will be deleted in the near future.
+	unknownFields     protoimpl.UnknownFields
-	XXX_weak_WeakMessage1 struct{} `protobuf:"bytes,100,opt,name=weak_message1,json=weakMessage1,weak=goproto.proto.test.weak.WeakImportMessage1" json:"weak_message1,omitempty" go:"track"`
+	sizeCache         protoimpl.SizeCache
-	// Deprecated: Do not use. This will be deleted in the near future.
-	XXX_weak_WeakMessage2 struct{} `protobuf:"bytes,101,opt,name=weak_message2,json=weakMessage2,weak=goproto.proto.test.weak.WeakImportMessage2" json:"weak_message2,omitempty" go:"track"`
-	weakFields            protoimpl.WeakFields
-	unknownFields         protoimpl.UnknownFields
-	sizeCache             protoimpl.SizeCache
 }
 
 func (x *TestFieldTrack) Reset() {
@@ -518,44 +512,6 @@ func (x *TestFieldTrack) GetMapStringMessage() map[string]*test.TestAllTypes_Nes
 	return nil
 }
 
-//go:nointerface
-func (x *TestFieldTrack) GetWeakMessage1() proto.Message {
-	var w protoimpl.WeakFields
-	if x != nil {
-		w = x.weakFields
-		_ = x.XXX_weak_WeakMessage1
-	}
-	return protoimpl.X.GetWeak(w, 100, "goproto.proto.test.weak.WeakImportMessage1")
-}
-
-//go:nointerface
-func (x *TestFieldTrack) GetWeakMessage2() proto.Message {
-	var w protoimpl.WeakFields
-	if x != nil {
-		w = x.weakFields
-		_ = x.XXX_weak_WeakMessage2
-	}
-	return protoimpl.X.GetWeak(w, 101, "goproto.proto.test.weak.WeakImportMessage2")
-}
-
-func (x *TestFieldTrack) SetWeakMessage1(v proto.Message) {
-	var w *protoimpl.WeakFields
-	if x != nil {
-		w = &x.weakFields
-		_ = x.XXX_weak_WeakMessage1
-	}
-	protoimpl.X.SetWeak(w, 100, "goproto.proto.test.weak.WeakImportMessage1", v)
-}
-
-func (x *TestFieldTrack) SetWeakMessage2(v proto.Message) {
-	var w *protoimpl.WeakFields
-	if x != nil {
-		w = &x.weakFields
-		_ = x.XXX_weak_WeakMessage2
-	}
-	protoimpl.X.SetWeak(w, 101, "goproto.proto.test.weak.WeakImportMessage2", v)
-}
-
 var File_internal_testprotos_fieldtrack_fieldtrack_proto protoreflect.FileDescriptor
 
 var file_internal_testprotos_fieldtrack_fieldtrack_proto_rawDesc = string([]byte{
@@ -563,18 +519,12 @@ var file_internal_testprotos_fieldtrack_fieldtrack_proto_rawDesc = string([]byte
 	0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x66, 0x69, 0x65, 0x6c, 0x64, 0x74, 0x72, 0x61, 0x63, 0x6b,
 	0x2f, 0x66, 0x69, 0x65, 0x6c, 0x64, 0x74, 0x72, 0x61, 0x63, 0x6b, 0x2e, 0x70, 0x72, 0x6f, 0x74,
 	0x6f, 0x12, 0x12, 0x67, 0x6f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x2e, 0x74, 0x65, 0x73, 0x74, 0x1a, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f,
+	0x2e, 0x74, 0x65, 0x73, 0x74, 0x1a, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f,
-	0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x2f,
-	0x77, 0x65, 0x61, 0x6b, 0x31, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x5f, 0x77, 0x65, 0x61, 0x6b, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f,
-	0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x2f,
-	0x77, 0x65, 0x61, 0x6b, 0x32, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x5f, 0x77, 0x65, 0x61, 0x6b, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x2f, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f,
 	0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x61, 0x6e, 0x6e, 0x6f, 0x74,
 	0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x61, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e,
 	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x23, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c,
 	0x2f, 0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x74, 0x65, 0x73, 0x74,
-	0x2f, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xfe, 0x24, 0x0a, 0x0e,
+	0x2f, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xd2, 0x23, 0x0a, 0x0e,
 	0x54, 0x65, 0x73, 0x74, 0x46, 0x69, 0x65, 0x6c, 0x64, 0x54, 0x72, 0x61, 0x63, 0x6b, 0x12, 0x25,
 	0x0a, 0x0e, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c, 0x5f, 0x69, 0x6e, 0x74, 0x33, 0x32,
 	0x18, 0x01, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0d, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x61, 0x6c,
@@ -781,100 +731,89 @@ var file_internal_testprotos_fieldtrack_fieldtrack_proto_rawDesc = string([]byte
 	0x74, 0x2e, 0x54, 0x65, 0x73, 0x74, 0x46, 0x69, 0x65, 0x6c, 0x64, 0x54, 0x72, 0x61, 0x63, 0x6b,
 	0x2e, 0x4d, 0x61, 0x70, 0x53, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67,
 	0x65, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x10, 0x6d, 0x61, 0x70, 0x53, 0x74, 0x72, 0x69, 0x6e,
-	0x67, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x12, 0x54, 0x0a, 0x0d, 0x77, 0x65, 0x61, 0x6b,
+	0x67, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x1a, 0x41, 0x0a, 0x13, 0x4d, 0x61, 0x70, 0x53,
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+	0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65,
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+	0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05,
-	0x70, 0x6f, 0x72, 0x74, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x31, 0x42, 0x02, 0x50, 0x01,
+	0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x1a, 0x41, 0x0a, 0x13, 0x4d,
-	0x52, 0x0c, 0x77, 0x65, 0x61, 0x6b, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x31, 0x12, 0x54,
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 })
 
 var (

internal/testprotos/fieldtrack/fieldtrack.proto

@@ -6,9 +6,6 @@ syntax = "proto2";
 
 package goproto.proto.test;
 
-import weak "internal/testprotos/test/weak1/test_weak.proto";
-import weak "internal/testprotos/test/weak2/test_weak.proto";
-
 import "internal/testprotos/annotation/annotation.proto";
 import "internal/testprotos/test/test.proto";
 
@@ -71,9 +68,4 @@ message TestFieldTrack {
   map<string, goproto.proto.test.TestAllTypes.NestedEnum> map_string_enum = 56;
   map<string, goproto.proto.test.TestAllTypes.NestedMessage>
       map_string_message = 57;
-
-  optional goproto.proto.test.weak.WeakImportMessage1 weak_message1 = 100
-      [weak = true];
-  optional goproto.proto.test.weak.WeakImportMessage2 weak_message2 = 101
-      [weak = true];
 }

internal/testprotos/test/test.proto

@@ -8,9 +8,6 @@ package goproto.proto.test;
 
 import public "internal/testprotos/test/test_public.proto";
 
-import weak "internal/testprotos/test/weak1/test_weak.proto";
-import weak "internal/testprotos/test/weak2/test_weak.proto";
-
 import "internal/testprotos/enums/enums.proto";
 import "internal/testprotos/required/required.proto";
 import "internal/testprotos/test/test_import.proto";
@@ -402,13 +399,6 @@ message TestRequiredLazy {
   optional TestRequired optional_lazy_message = 1 [lazy = true];
 }
 
-message TestWeak {
-  optional goproto.proto.test.weak.WeakImportMessage1 weak_message1 = 1
-      [weak = true];
-  optional goproto.proto.test.weak.WeakImportMessage2 weak_message2 = 2
-      [weak = true];
-}
-
 message TestPackedTypes {
   repeated int32 packed_int32 = 90 [packed = true];
   repeated int64 packed_int64 = 91 [packed = true];

internal/testprotos/test/weak1/test_weak.pb.go

@@ -1,124 +0,0 @@
-// 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.
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// source: internal/testprotos/test/weak1/test_weak.proto
-
-package weak1
-
-import (
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	reflect "reflect"
-	sync "sync"
-	unsafe "unsafe"
-)
-
-type WeakImportMessage1 struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	A             *int32                 `protobuf:"varint,1,req,name=a" json:"a,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *WeakImportMessage1) Reset() {
-	*x = WeakImportMessage1{}
-	mi := &file_internal_testprotos_test_weak1_test_weak_proto_msgTypes[0]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *WeakImportMessage1) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*WeakImportMessage1) ProtoMessage() {}
-
-func (x *WeakImportMessage1) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_test_weak1_test_weak_proto_msgTypes[0]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use WeakImportMessage1.ProtoReflect.Descriptor instead.
-func (*WeakImportMessage1) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_test_weak1_test_weak_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *WeakImportMessage1) GetA() int32 {
-	if x != nil && x.A != nil {
-		return *x.A
-	}
-	return 0
-}
-
-var File_internal_testprotos_test_weak1_test_weak_proto protoreflect.FileDescriptor
-
-var file_internal_testprotos_test_weak1_test_weak_proto_rawDesc = string([]byte{
-	0x0a, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x70,
-	0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x2f, 0x77, 0x65, 0x61, 0x6b, 0x31,
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-	0x12, 0x17, 0x67, 0x6f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e,
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-	0x0c, 0x0a, 0x01, 0x61, 0x18, 0x01, 0x20, 0x02, 0x28, 0x05, 0x52, 0x01, 0x61, 0x42, 0x3b, 0x5a,
-	0x39, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67, 0x2e, 0x6f,
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-	0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f,
-	0x74, 0x65, 0x73, 0x74, 0x2f, 0x77, 0x65, 0x61, 0x6b, 0x31,
-})
-
-var (
-	file_internal_testprotos_test_weak1_test_weak_proto_rawDescOnce sync.Once
-	file_internal_testprotos_test_weak1_test_weak_proto_rawDescData []byte
-)
-
-func file_internal_testprotos_test_weak1_test_weak_proto_rawDescGZIP() []byte {
-	file_internal_testprotos_test_weak1_test_weak_proto_rawDescOnce.Do(func() {
-		file_internal_testprotos_test_weak1_test_weak_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_internal_testprotos_test_weak1_test_weak_proto_rawDesc), len(file_internal_testprotos_test_weak1_test_weak_proto_rawDesc)))
-	})
-	return file_internal_testprotos_test_weak1_test_weak_proto_rawDescData
-}
-
-var file_internal_testprotos_test_weak1_test_weak_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_internal_testprotos_test_weak1_test_weak_proto_goTypes = []any{
-	(*WeakImportMessage1)(nil), // 0: goproto.proto.test.weak.WeakImportMessage1
-}
-var file_internal_testprotos_test_weak1_test_weak_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_internal_testprotos_test_weak1_test_weak_proto_init() }
-func file_internal_testprotos_test_weak1_test_weak_proto_init() {
-	if File_internal_testprotos_test_weak1_test_weak_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: unsafe.Slice(unsafe.StringData(file_internal_testprotos_test_weak1_test_weak_proto_rawDesc), len(file_internal_testprotos_test_weak1_test_weak_proto_rawDesc)),
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_internal_testprotos_test_weak1_test_weak_proto_goTypes,
-		DependencyIndexes: file_internal_testprotos_test_weak1_test_weak_proto_depIdxs,
-		MessageInfos:      file_internal_testprotos_test_weak1_test_weak_proto_msgTypes,
-	}.Build()
-	File_internal_testprotos_test_weak1_test_weak_proto = out.File
-	file_internal_testprotos_test_weak1_test_weak_proto_goTypes = nil
-	file_internal_testprotos_test_weak1_test_weak_proto_depIdxs = nil
-}

internal/testprotos/test/weak1/test_weak.proto

@@ -1,13 +0,0 @@
-// 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.
-
-syntax = "proto2";
-
-package goproto.proto.test.weak;
-
-option go_package = "google.golang.org/protobuf/internal/testprotos/test/weak1";
-
-message WeakImportMessage1 {
-  required int32 a = 1;
-}

internal/testprotos/test/weak2/test_weak.pb.go

@@ -1,124 +0,0 @@
-// 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.
-
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// source: internal/testprotos/test/weak2/test_weak.proto
-
-package weak2
-
-import (
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	reflect "reflect"
-	sync "sync"
-	unsafe "unsafe"
-)
-
-type WeakImportMessage2 struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	A             *int32                 `protobuf:"varint,1,req,name=a" json:"a,omitempty"`
-	unknownFields protoimpl.UnknownFields
-	sizeCache     protoimpl.SizeCache
-}
-
-func (x *WeakImportMessage2) Reset() {
-	*x = WeakImportMessage2{}
-	mi := &file_internal_testprotos_test_weak2_test_weak_proto_msgTypes[0]
-	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-	ms.StoreMessageInfo(mi)
-}
-
-func (x *WeakImportMessage2) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*WeakImportMessage2) ProtoMessage() {}
-
-func (x *WeakImportMessage2) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_testprotos_test_weak2_test_weak_proto_msgTypes[0]
-	if x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use WeakImportMessage2.ProtoReflect.Descriptor instead.
-func (*WeakImportMessage2) Descriptor() ([]byte, []int) {
-	return file_internal_testprotos_test_weak2_test_weak_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *WeakImportMessage2) GetA() int32 {
-	if x != nil && x.A != nil {
-		return *x.A
-	}
-	return 0
-}
-
-var File_internal_testprotos_test_weak2_test_weak_proto protoreflect.FileDescriptor
-
-var file_internal_testprotos_test_weak2_test_weak_proto_rawDesc = string([]byte{
-	0x0a, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x70,
-	0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x74, 0x65, 0x73, 0x74, 0x2f, 0x77, 0x65, 0x61, 0x6b, 0x32,
-	0x2f, 0x74, 0x65, 0x73, 0x74, 0x5f, 0x77, 0x65, 0x61, 0x6b, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x12, 0x17, 0x67, 0x6f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e,
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-	0x6b, 0x49, 0x6d, 0x70, 0x6f, 0x72, 0x74, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x32, 0x12,
-	0x0c, 0x0a, 0x01, 0x61, 0x18, 0x01, 0x20, 0x02, 0x28, 0x05, 0x52, 0x01, 0x61, 0x42, 0x3b, 0x5a,
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-	0x74, 0x65, 0x73, 0x74, 0x2f, 0x77, 0x65, 0x61, 0x6b, 0x32,
-})
-
-var (
-	file_internal_testprotos_test_weak2_test_weak_proto_rawDescOnce sync.Once
-	file_internal_testprotos_test_weak2_test_weak_proto_rawDescData []byte
-)
-
-func file_internal_testprotos_test_weak2_test_weak_proto_rawDescGZIP() []byte {
-	file_internal_testprotos_test_weak2_test_weak_proto_rawDescOnce.Do(func() {
-		file_internal_testprotos_test_weak2_test_weak_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_internal_testprotos_test_weak2_test_weak_proto_rawDesc), len(file_internal_testprotos_test_weak2_test_weak_proto_rawDesc)))
-	})
-	return file_internal_testprotos_test_weak2_test_weak_proto_rawDescData
-}
-
-var file_internal_testprotos_test_weak2_test_weak_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
-var file_internal_testprotos_test_weak2_test_weak_proto_goTypes = []any{
-	(*WeakImportMessage2)(nil), // 0: goproto.proto.test.weak.WeakImportMessage2
-}
-var file_internal_testprotos_test_weak2_test_weak_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
-}
-
-func init() { file_internal_testprotos_test_weak2_test_weak_proto_init() }
-func file_internal_testprotos_test_weak2_test_weak_proto_init() {
-	if File_internal_testprotos_test_weak2_test_weak_proto != nil {
-		return
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: unsafe.Slice(unsafe.StringData(file_internal_testprotos_test_weak2_test_weak_proto_rawDesc), len(file_internal_testprotos_test_weak2_test_weak_proto_rawDesc)),
-			NumEnums:      0,
-			NumMessages:   1,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_internal_testprotos_test_weak2_test_weak_proto_goTypes,
-		DependencyIndexes: file_internal_testprotos_test_weak2_test_weak_proto_depIdxs,
-		MessageInfos:      file_internal_testprotos_test_weak2_test_weak_proto_msgTypes,
-	}.Build()
-	File_internal_testprotos_test_weak2_test_weak_proto = out.File
-	file_internal_testprotos_test_weak2_test_weak_proto_goTypes = nil
-	file_internal_testprotos_test_weak2_test_weak_proto_depIdxs = nil
-}

internal/testprotos/test/weak2/test_weak.proto

@@ -1,13 +0,0 @@
-// 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.
-
-syntax = "proto2";
-
-package goproto.proto.test.weak;
-
-option go_package = "google.golang.org/protobuf/internal/testprotos/test/weak2";
-
-message WeakImportMessage2 {
-  required int32 a = 1;
-}

proto/checkinit_test.go

@@ -10,11 +10,9 @@ import (
 	"testing"
 
 	"google.golang.org/protobuf/encoding/prototext"
-	"google.golang.org/protobuf/internal/flags"
 	"google.golang.org/protobuf/proto"
 
 	testpb "google.golang.org/protobuf/internal/testprotos/test"
-	weakpb "google.golang.org/protobuf/internal/testprotos/test/weak1"
 	testeditionspb "google.golang.org/protobuf/internal/testprotos/testeditions"
 )
 
@@ -70,28 +68,6 @@ func TestCheckInitializedErrors(t *testing.T) {
 			},
 		},
 		want: `goproto.proto.testeditions.TestRequired.required_field`,
-	}, {
-		m:    &testpb.TestWeak{},
-		want: `<nil>`,
-		skip: !flags.ProtoLegacyWeak,
-	}, {
-		m: func() proto.Message {
-			m := &testpb.TestWeak{}
-			m.SetWeakMessage1(&weakpb.WeakImportMessage1{})
-			return m
-		}(),
-		want: `goproto.proto.test.weak.WeakImportMessage1.a`,
-		skip: !flags.ProtoLegacyWeak,
-	}, {
-		m: func() proto.Message {
-			m := &testpb.TestWeak{}
-			m.SetWeakMessage1(&weakpb.WeakImportMessage1{
-				A: proto.Int32(1),
-			})
-			return m
-		}(),
-		want: `<nil>`,
-		skip: !flags.ProtoLegacyWeak,
 	}}
 
 	for _, tt := range tests {

proto/decode.go

@@ -8,7 +8,6 @@ import (
 	"google.golang.org/protobuf/encoding/protowire"
 	"google.golang.org/protobuf/internal/encoding/messageset"
 	"google.golang.org/protobuf/internal/errors"
-	"google.golang.org/protobuf/internal/flags"
 	"google.golang.org/protobuf/internal/genid"
 	"google.golang.org/protobuf/internal/pragma"
 	"google.golang.org/protobuf/reflect/protoreflect"
@@ -172,10 +171,6 @@ func (o UnmarshalOptions) unmarshalMessageSlow(b []byte, m protoreflect.Message)
 		var err error
 		if fd == nil {
 			err = errUnknown
-		} else if flags.ProtoLegacyWeak {
-			if fd.IsWeak() && fd.Message().IsPlaceholder() {
-				err = errUnknown // weak referent is not linked in
-			}
 		}
 
 		// Parse the field value.

proto/testmessages_opaque_test.go

@@ -22,7 +22,6 @@ import (
 	_ "google.golang.org/protobuf/internal/testprotos/required"
 	_ "google.golang.org/protobuf/internal/testprotos/required/required_opaque"
 	_ "google.golang.org/protobuf/internal/testprotos/test"
-	_ "google.golang.org/protobuf/internal/testprotos/test/weak1"
 	_ "google.golang.org/protobuf/internal/testprotos/test3"
 	_ "google.golang.org/protobuf/internal/testprotos/testeditions/testeditions_hybrid"
 	_ "google.golang.org/protobuf/internal/testprotos/testeditions/testeditions_opaque"

proto/weak_test.go

@@ -1,125 +0,0 @@
-// 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 proto_test
-
-import (
-	"testing"
-
-	"google.golang.org/protobuf/internal/flags"
-	"google.golang.org/protobuf/internal/protobuild"
-	"google.golang.org/protobuf/proto"
-	"google.golang.org/protobuf/testing/protopack"
-
-	testpb "google.golang.org/protobuf/internal/testprotos/test"
-	weakpb "google.golang.org/protobuf/internal/testprotos/test/weak1"
-)
-
-func init() {
-	if flags.ProtoLegacyWeak {
-		testValidMessages = append(testValidMessages, testWeakValidMessages...)
-		testInvalidMessages = append(testInvalidMessages, testWeakInvalidMessages...)
-		testMerges = append(testMerges, testWeakMerges...)
-	}
-}
-
-var testWeakValidMessages = []testProto{
-	{
-		desc: "weak message",
-		decodeTo: []proto.Message{
-			func() proto.Message {
-				if !flags.ProtoLegacyWeak {
-					return nil
-				}
-				m := &testpb.TestWeak{}
-				m.SetWeakMessage1(&weakpb.WeakImportMessage1{
-					A: proto.Int32(1000),
-				})
-				m.ProtoReflect().SetUnknown(protopack.Message{
-					protopack.Tag{2, protopack.BytesType}, protopack.LengthPrefix(protopack.Message{
-						protopack.Tag{1, protopack.VarintType}, protopack.Varint(2000),
-					}),
-				}.Marshal())
-				return m
-			}(),
-		},
-		wire: protopack.Message{
-			protopack.Tag{1, protopack.BytesType}, protopack.LengthPrefix(protopack.Message{
-				protopack.Tag{1, protopack.VarintType}, protopack.Varint(1000),
-			}),
-			protopack.Tag{2, protopack.BytesType}, protopack.LengthPrefix(protopack.Message{
-				protopack.Tag{1, protopack.VarintType}, protopack.Varint(2000),
-			}),
-		}.Marshal(),
-	},
-}
-
-var testWeakInvalidMessages = []testProto{
-	{
-		desc:     "invalid field number 0 in weak message",
-		decodeTo: []proto.Message{(*testpb.TestWeak)(nil)},
-		wire: protopack.Message{
-			protopack.Tag{1, protopack.BytesType}, protopack.LengthPrefix(protopack.Message{
-				protopack.Tag{0, protopack.VarintType}, protopack.Varint(1000),
-			}),
-		}.Marshal(),
-	},
-}
-
-var testWeakMerges = []testMerge{
-	{
-		desc: "clone weak message",
-		src: protobuild.Message{
-			"weak_message1": protobuild.Message{
-				"a": 1,
-			},
-		},
-		types: []proto.Message{&testpb.TestWeak{}},
-	}, {
-		desc: "merge weak message",
-		dst: protobuild.Message{
-			"weak_message1": protobuild.Message{
-				"a": 1,
-			},
-		},
-		src: protobuild.Message{
-			"weak_message1": protobuild.Message{
-				"a": 2,
-			},
-		},
-		want: protobuild.Message{
-			"weak_message1": protobuild.Message{
-				"a": 2,
-			},
-		},
-		types: []proto.Message{&testpb.TestWeak{}},
-	},
-}
-
-func TestWeakNil(t *testing.T) {
-	if !flags.ProtoLegacyWeak {
-		t.SkipNow()
-	}
-
-	m := new(testpb.TestWeak)
-	if v, ok := m.GetWeakMessage1().(*weakpb.WeakImportMessage1); !ok || v != nil {
-		t.Errorf("m.GetWeakMessage1() = type %[1]T(%[1]v), want (*weakpb.WeakImportMessage1)", v)
-	}
-}
-
-func TestWeakMarshalNil(t *testing.T) {
-	if !flags.ProtoLegacyWeak {
-		t.SkipNow()
-	}
-
-	m := new(testpb.TestWeak)
-	m.SetWeakMessage1(nil)
-	if b, err := proto.Marshal(m); err != nil || len(b) != 0 {
-		t.Errorf("Marshal(weak field set to nil) = [%x], %v; want [], nil", b, err)
-	}
-	m.SetWeakMessage1((*weakpb.WeakImportMessage1)(nil))
-	if b, err := proto.Marshal(m); err != nil || len(b) != 0 {
-		t.Errorf("Marshal(weak field set to typed nil) = [%x], %v; want [], nil", b, err)
-	}
-}

reflect/protodesc/desc.go

@@ -132,17 +132,11 @@ func (o FileOptions) New(fd *descriptorpb.FileDescriptorProto, r Resolver) (prot
 		}
 		f.L2.Imports[i].IsPublic = true
 	}
-	for _, i := range fd.GetWeakDependency() {
-		if !(0 <= i && int(i) < len(f.L2.Imports)) || f.L2.Imports[i].IsWeak {
-			return nil, errors.New("invalid or duplicate weak import index: %d", i)
-		}
-		f.L2.Imports[i].IsWeak = true
-	}
 	imps := importSet{f.Path(): true}
 	for i, path := range fd.GetDependency() {
 		imp := &f.L2.Imports[i]
 		f, err := r.FindFileByPath(path)
-		if err == protoregistry.NotFound && (o.AllowUnresolvable || imp.IsWeak) {
+		if err == protoregistry.NotFound && o.AllowUnresolvable {
 			f = filedesc.PlaceholderFile(path)
 		} else if err != nil {
 			return nil, errors.New("could not resolve import %q: %v", path, err)

reflect/protodesc/desc_init.go

@@ -149,7 +149,6 @@ func (r descsByName) initFieldsFromDescriptorProto(fds []*descriptorpb.FieldDesc
 		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.IsLazy = opts.GetLazy()
 			if opts.Packed != nil {
 				f.L1.EditionFeatures.IsPacked = opts.GetPacked()

reflect/protodesc/desc_resolve.go

@@ -43,7 +43,7 @@ func (r *resolver) resolveMessageDependencies(ms []filedesc.Message, mds []*desc
 				o.L1.Fields.List = append(o.L1.Fields.List, f)
 			}
 
-			if f.L1.Kind, f.L1.Enum, f.L1.Message, err = r.findTarget(f.Kind(), f.Parent().FullName(), partialName(fd.GetTypeName()), f.IsWeak()); err != nil {
+			if f.L1.Kind, f.L1.Enum, f.L1.Message, err = r.findTarget(f.Kind(), f.Parent().FullName(), partialName(fd.GetTypeName())); err != nil {
 				return errors.New("message field %q cannot resolve type: %v", f.FullName(), err)
 			}
 			if f.L1.Kind == protoreflect.GroupKind && (f.IsMap() || f.IsMapEntry()) {
@@ -73,10 +73,10 @@ func (r *resolver) resolveMessageDependencies(ms []filedesc.Message, mds []*desc
 func (r *resolver) resolveExtensionDependencies(xs []filedesc.Extension, xds []*descriptorpb.FieldDescriptorProto) (err error) {
 	for i, xd := range xds {
 		x := &xs[i]
-		if x.L1.Extendee, err = r.findMessageDescriptor(x.Parent().FullName(), partialName(xd.GetExtendee()), false); err != nil {
+		if x.L1.Extendee, err = r.findMessageDescriptor(x.Parent().FullName(), partialName(xd.GetExtendee())); err != nil {
 			return errors.New("extension field %q cannot resolve extendee: %v", x.FullName(), err)
 		}
-		if x.L1.Kind, x.L2.Enum, x.L2.Message, err = r.findTarget(x.Kind(), x.Parent().FullName(), partialName(xd.GetTypeName()), false); err != nil {
+		if x.L1.Kind, x.L2.Enum, x.L2.Message, err = r.findTarget(x.Kind(), x.Parent().FullName(), partialName(xd.GetTypeName())); err != nil {
 			return errors.New("extension field %q cannot resolve type: %v", x.FullName(), err)
 		}
 		if xd.DefaultValue != nil {
@@ -95,11 +95,11 @@ func (r *resolver) resolveServiceDependencies(ss []filedesc.Service, sds []*desc
 		s := &ss[i]
 		for j, md := range sd.GetMethod() {
 			m := &s.L2.Methods.List[j]
-			m.L1.Input, err = r.findMessageDescriptor(m.Parent().FullName(), partialName(md.GetInputType()), false)
+			m.L1.Input, err = r.findMessageDescriptor(m.Parent().FullName(), partialName(md.GetInputType()))
 			if err != nil {
 				return errors.New("service method %q cannot resolve input: %v", m.FullName(), err)
 			}
-			m.L1.Output, err = r.findMessageDescriptor(s.FullName(), partialName(md.GetOutputType()), false)
+			m.L1.Output, err = r.findMessageDescriptor(s.FullName(), partialName(md.GetOutputType()))
 			if err != nil {
 				return errors.New("service method %q cannot resolve output: %v", m.FullName(), err)
 			}
@@ -111,16 +111,16 @@ func (r *resolver) resolveServiceDependencies(ss []filedesc.Service, sds []*desc
 // findTarget finds an enum or message descriptor if k is an enum, message,
 // group, or unknown. If unknown, and the name could be resolved, the kind
 // returned kind is set based on the type of the resolved descriptor.
-func (r *resolver) findTarget(k protoreflect.Kind, scope protoreflect.FullName, ref partialName, isWeak bool) (protoreflect.Kind, protoreflect.EnumDescriptor, protoreflect.MessageDescriptor, error) {
+func (r *resolver) findTarget(k protoreflect.Kind, scope protoreflect.FullName, ref partialName) (protoreflect.Kind, protoreflect.EnumDescriptor, protoreflect.MessageDescriptor, error) {
 	switch k {
 	case protoreflect.EnumKind:
-		ed, err := r.findEnumDescriptor(scope, ref, isWeak)
+		ed, err := r.findEnumDescriptor(scope, ref)
 		if err != nil {
 			return 0, nil, nil, err
 		}
 		return k, ed, nil, nil
 	case protoreflect.MessageKind, protoreflect.GroupKind:
-		md, err := r.findMessageDescriptor(scope, ref, isWeak)
+		md, err := r.findMessageDescriptor(scope, ref)
 		if err != nil {
 			return 0, nil, nil, err
 		}
@@ -129,7 +129,7 @@ func (r *resolver) findTarget(k protoreflect.Kind, scope protoreflect.FullName,
 		// Handle unspecified kinds (possible with parsers that operate
 		// on a per-file basis without knowledge of dependencies).
 		d, err := r.findDescriptor(scope, ref)
-		if err == protoregistry.NotFound && (r.allowUnresolvable || isWeak) {
+		if err == protoregistry.NotFound && r.allowUnresolvable {
 			return k, filedesc.PlaceholderEnum(ref.FullName()), filedesc.PlaceholderMessage(ref.FullName()), nil
 		} else if err == protoregistry.NotFound {
 			return 0, nil, nil, errors.New("%q not found", ref.FullName())
@@ -206,9 +206,9 @@ func (r *resolver) findDescriptor(scope protoreflect.FullName, ref partialName)
 	}
 }
 
-func (r *resolver) findEnumDescriptor(scope protoreflect.FullName, ref partialName, isWeak bool) (protoreflect.EnumDescriptor, error) {
+func (r *resolver) findEnumDescriptor(scope protoreflect.FullName, ref partialName) (protoreflect.EnumDescriptor, error) {
 	d, err := r.findDescriptor(scope, ref)
-	if err == protoregistry.NotFound && (r.allowUnresolvable || isWeak) {
+	if err == protoregistry.NotFound && r.allowUnresolvable {
 		return filedesc.PlaceholderEnum(ref.FullName()), nil
 	} else if err == protoregistry.NotFound {
 		return nil, errors.New("%q not found", ref.FullName())
@@ -222,9 +222,9 @@ func (r *resolver) findEnumDescriptor(scope protoreflect.FullName, ref partialNa
 	return ed, nil
 }
 
-func (r *resolver) findMessageDescriptor(scope protoreflect.FullName, ref partialName, isWeak bool) (protoreflect.MessageDescriptor, error) {
+func (r *resolver) findMessageDescriptor(scope protoreflect.FullName, ref partialName) (protoreflect.MessageDescriptor, error) {
 	d, err := r.findDescriptor(scope, ref)
-	if err == protoregistry.NotFound && (r.allowUnresolvable || isWeak) {
+	if err == protoregistry.NotFound && r.allowUnresolvable {
 		return filedesc.PlaceholderMessage(ref.FullName()), nil
 	} else if err == protoregistry.NotFound {
 		return nil, errors.New("%q not found", ref.FullName())

reflect/protodesc/desc_validate.go

@@ -149,12 +149,6 @@ func validateMessageDeclarations(file *filedesc.File, ms []filedesc.Message, mds
 					return errors.New("message field %q under proto3 optional semantics must be within a single element oneof", f.FullName())
 				}
 			}
-			if f.IsWeak() && !flags.ProtoLegacyWeak {
-				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.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())
 			}
@@ -199,9 +193,6 @@ func validateMessageDeclarations(file *filedesc.File, ms []filedesc.Message, mds
 				if f.Cardinality() != protoreflect.Optional {
 					return errors.New("message field %q belongs in a oneof and must be optional", f.FullName())
 				}
-				if f.IsWeak() {
-					return errors.New("message field %q belongs in a oneof and must not be a weak reference", f.FullName())
-				}
 			}
 		}
 
@@ -254,9 +245,6 @@ func validateExtensionDeclarations(f *filedesc.File, xs []filedesc.Extension, xd
 				return errors.New("extension field %q has an invalid number: %d", x.FullName(), x.Number())
 			}
 		}
-		if xd.GetOptions().GetWeak() {
-			return errors.New("extension field %q cannot be a weak reference", x.FullName())
-		}
 		if x.IsPacked() && !isPackable(x) {
 			return errors.New("extension field %q is not packable", x.FullName())
 		}

reflect/protodesc/file_test.go

@@ -173,24 +173,6 @@ func TestNewFile(t *testing.T) {
 		`),
 		inOpts:  FileOptions{AllowUnresolvable: true},
 		wantErr: `already imported "dep.proto"`,
-	}, {
-		label: "invalid weak import",
-		inDesc: mustParseFile(`
-			name:            "test.proto"
-			dependency:      "dep.proto"
-			weak_dependency: [-23]
-		`),
-		inOpts:  FileOptions{AllowUnresolvable: true},
-		wantErr: `invalid or duplicate weak import index: -23`,
-	}, {
-		label: "normal weak and public import",
-		inDesc: mustParseFile(`
-			name:              "test.proto"
-			dependency:        "dep.proto"
-			weak_dependency:   [0]
-			public_dependency: [0]
-		`),
-		inOpts: FileOptions{AllowUnresolvable: true},
 	}, {
 		label: "import public indirect dependency duplicate",
 		inDeps: []*descriptorpb.FileDescriptorProto{

reflect/protodesc/proto.go

@@ -32,9 +32,6 @@ func ToFileDescriptorProto(file protoreflect.FileDescriptor) *descriptorpb.FileD
 		if imp.IsPublic {
 			p.PublicDependency = append(p.PublicDependency, int32(i))
 		}
-		if imp.IsWeak {
-			p.WeakDependency = append(p.WeakDependency, int32(i))
-		}
 	}
 	for i, locs := 0, file.SourceLocations(); i < locs.Len(); i++ {
 		loc := locs.Get(i)

reflect/protoreflect/type.go

@@ -68,7 +68,7 @@ type Descriptor interface {
 	// dependency is not resolved, in which case only name information is known.
 	//
 	// Placeholder types may only be returned by the following accessors
-	// as a result of unresolved dependencies or weak imports:
+	// as a result of unresolved dependencies:
 	//
 	//	╔═══════════════════════════════════╤═════════════════════╗
 	//	║ Accessor                          │ Descriptor          ║
@@ -168,11 +168,7 @@ type FileImport struct {
 	// The current file and the imported file must be within proto package.
 	IsPublic bool
 
-	// IsWeak reports whether this is a weak import, which does not impose
+	// Deprecated: support for weak fields has been removed.
-	// a direct dependency on the target file.
-	//
-	// Weak imports are a legacy proto1 feature. Equivalent behavior is
-	// achieved using proto2 extension fields or proto3 Any messages.
 	IsWeak bool
 }
 
@@ -325,9 +321,7 @@ type FieldDescriptor interface {
 	// specified in the source .proto file.
 	HasOptionalKeyword() bool
 
-	// IsWeak reports whether this is a weak field, which does not impose a
+	// Deprecated: support for weak fields has been removed.
-	// direct dependency on the target type.
-	// If true, then Message returns a placeholder type.
 	IsWeak() bool
 
 	// IsPacked reports whether repeated primitive numeric kinds should be

testing/prototest/message.go

@@ -878,9 +878,6 @@ func populateMessage(m protoreflect.Message, n seed, stack []protoreflect.Messag
 	stack = append(stack, md)
 	for i := 0; i < md.Fields().Len(); i++ {
 		fd := md.Fields().Get(i)
-		if fd.IsWeak() {
-			continue
-		}
 		m.Set(fd, newValue(m, fd, newSeed(n, i), stack))
 	}
 	return protoreflect.ValueOfMessage(m)

testing/prototest/prototest_test.go

@@ -8,7 +8,6 @@ import (
 	"fmt"
 	"testing"
 
-	"google.golang.org/protobuf/internal/flags"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/runtime/protoimpl"
 	"google.golang.org/protobuf/testing/prototest"
@@ -17,8 +16,6 @@ import (
 	legacypb "google.golang.org/protobuf/internal/testprotos/legacy"
 	legacy1pb "google.golang.org/protobuf/internal/testprotos/legacy/proto2_20160225_2fc053c5"
 	testpb "google.golang.org/protobuf/internal/testprotos/test"
-	_ "google.golang.org/protobuf/internal/testprotos/test/weak1"
-	_ "google.golang.org/protobuf/internal/testprotos/test/weak2"
 	test3pb "google.golang.org/protobuf/internal/testprotos/test3"
 	testeditionspb "google.golang.org/protobuf/internal/testprotos/testeditions"
 )
@@ -36,9 +33,6 @@ func Test(t *testing.T) {
 		(*legacypb.Legacy)(nil),
 		protoimpl.X.MessageOf((*legacy1pb.Message)(nil)).Interface(),
 	}
-	if flags.ProtoLegacyWeak {
-		ms = append(ms, (*testpb.TestWeak)(nil))
-	}
 
 	for _, m := range ms {
 		t.Run(fmt.Sprintf("%T", m), func(t *testing.T) {