diff --git a/cmd/protoc-gen-go/internal_gengo/api_flags.go b/cmd/protoc-gen-go/internal_gengo/api_flags.go
deleted file mode 100644
index 80dbc29..0000000
--- a/cmd/protoc-gen-go/internal_gengo/api_flags.go
+++ /dev/null
@@ -1,35 +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 internal_gengo
-
-import (
-	"sync"
-
-	"google.golang.org/protobuf/compiler/protogen"
-)
-
-// messageAPIFlags provides flags that control the generated API.
-type messageAPIFlags struct {
-	WeakMapField bool
-}
-
-var messageAPIFlagsCache sync.Map
-
-func loadMessageAPIFlags(message *protogen.Message) messageAPIFlags {
-	if flags, ok := messageAPIFlagsCache.Load(message); ok {
-		return flags.(messageAPIFlags)
-	}
-
-	var flags messageAPIFlags
-	for _, field := range message.Fields {
-		if field.Desc.IsWeak() {
-			flags.WeakMapField = true
-			break
-		}
-	}
-
-	messageAPIFlagsCache.Store(message, flags)
-	return flags
-}
diff --git a/cmd/protoc-gen-go/internal_gengo/flags.go b/cmd/protoc-gen-go/internal_gengo/flags.go
new file mode 100644
index 0000000..e89f4d4
--- /dev/null
+++ b/cmd/protoc-gen-go/internal_gengo/flags.go
@@ -0,0 +1,51 @@
+// 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 internal_gengo
+
+import (
+	"google.golang.org/protobuf/compiler/protogen"
+	"google.golang.org/protobuf/internal/encoding/wire"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// messageFlags provides flags that control the generated API.
+type messageFlags struct {
+	IsTracked bool
+	HasWeak   bool
+}
+
+func loadMessageFlags(message *protogen.Message) messageFlags {
+	var flags messageFlags
+	flags.IsTracked = isTrackedMessage(message)
+	for _, field := range message.Fields {
+		if field.Desc.IsWeak() {
+			flags.HasWeak = true
+			break
+		}
+	}
+	return flags
+}
+
+// isTrackedMessage reports whether field tracking is enabled on the message.
+// It is a variable so that the behavior is easily overridden in another file.
+var isTrackedMessage = func(message *protogen.Message) (tracked bool) {
+	const trackFieldUse_fieldNumber = 37383685
+
+	// Decode the option from unknown fields to avoid a dependency on the
+	// annotation proto from protoc-gen-go.
+	b := message.Desc.Options().(*descriptorpb.MessageOptions).ProtoReflect().GetUnknown()
+	for len(b) > 0 {
+		num, typ, n := wire.ConsumeTag(b)
+		b = b[n:]
+		if num == trackFieldUse_fieldNumber && typ == wire.VarintType {
+			v, _ := wire.ConsumeVarint(b)
+			tracked = wire.DecodeBool(v)
+		}
+		m := wire.ConsumeFieldValue(num, typ, b)
+		b = b[m:]
+	}
+	return tracked
+}
diff --git a/cmd/protoc-gen-go/internal_gengo/main.go b/cmd/protoc-gen-go/internal_gengo/main.go
index dfc3102..2eb33aa 100644
--- a/cmd/protoc-gen-go/internal_gengo/main.go
+++ b/cmd/protoc-gen-go/internal_gengo/main.go
@@ -402,35 +402,42 @@
 	}
 }
 
+type messageInfo struct {
+	*protogen.Message
+	messageFlags
+}
+
 func genMessage(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
 	if message.Desc.IsMapEntry() {
 		return
 	}
 
+	m := &messageInfo{message, loadMessageFlags(message)}
+
 	// Message type declaration.
-	g.Annotate(message.GoIdent.GoName, message.Location)
-	leadingComments := appendDeprecationSuffix(message.Comments.Leading,
-		message.Desc.Options().(*descriptorpb.MessageOptions).GetDeprecated())
+	g.Annotate(m.GoIdent.GoName, m.Location)
+	leadingComments := appendDeprecationSuffix(m.Comments.Leading,
+		m.Desc.Options().(*descriptorpb.MessageOptions).GetDeprecated())
 	g.P(leadingComments,
-		"type ", message.GoIdent, " struct {")
-	genMessageFields(g, f, message)
+		"type ", m.GoIdent, " struct {")
+	genMessageFields(g, f, m)
 	g.P("}")
 	g.P()
 
-	genDefaultDecls(g, f, message)
-	genMessageMethods(gen, g, f, message)
-	genOneofWrapperTypes(gen, g, f, message)
+	genMessageDefaultDecls(g, f, m)
+	genMessageMethods(gen, g, f, m)
+	genMessageOneofWrapperTypes(gen, g, f, m)
 }
 
-func genMessageFields(g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
-	sf := f.allMessageFieldsByPtr[message]
-	genMessageInternalFields(g, message, sf)
-	for _, field := range message.Fields {
-		genMessageField(g, f, message, field, sf)
+func genMessageFields(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
+	sf := f.allMessageFieldsByPtr[m.Message]
+	genMessageInternalFields(g, f, m, sf)
+	for _, field := range m.Fields {
+		genMessageField(g, f, m, field, sf)
 	}
 }
 
-func genMessageInternalFields(g *protogen.GeneratedFile, message *protogen.Message, sf *structFields) {
+func genMessageInternalFields(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, sf *structFields) {
 	if generateMessageStateFields {
 		g.P("state ", protoimplPackage.Ident("MessageState"))
 		sf.append("state")
@@ -442,7 +449,7 @@
 		g.P("sizeCache", " ", protoimplPackage.Ident("SizeCache"))
 		sf.append("sizeCache")
 	}
-	if loadMessageAPIFlags(message).WeakMapField {
+	if m.HasWeak {
 		g.P("XXX_weak", " ", protoimplPackage.Ident("WeakFields"), jsonIgnoreTags)
 		sf.append("XXX_weak")
 	}
@@ -453,7 +460,7 @@
 		g.P("unknownFields", " ", protoimplPackage.Ident("UnknownFields"))
 		sf.append("unknownFields")
 	}
-	if message.Desc.ExtensionRanges().Len() > 0 {
+	if m.Desc.ExtensionRanges().Len() > 0 {
 		if generateExportedExtensionFields {
 			g.P("XXX_InternalExtensions", " ", protoimplPackage.Ident("ExtensionFields"), jsonIgnoreTags)
 			sf.append("XXX_InternalExtensions")
@@ -467,7 +474,7 @@
 	}
 }
 
-func genMessageField(g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message, field *protogen.Field, sf *structFields) {
+func genMessageField(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, field *protogen.Field, sf *structFields) {
 	if oneof := field.Oneof; oneof != nil {
 		// It would be a bit simpler to iterate over the oneofs below,
 		// but generating the field here keeps the contents of the Go
@@ -480,8 +487,11 @@
 		tags := structTags{
 			{"protobuf_oneof", string(oneof.Desc.Name())},
 		}
+		if m.IsTracked {
+			tags = append(tags, gotrackTags...)
+		}
 
-		g.Annotate(message.GoIdent.GoName+"."+oneof.GoName, oneof.Location)
+		g.Annotate(m.GoIdent.GoName+"."+oneof.GoName, oneof.Location)
 		leadingComments := oneof.Comments.Leading
 		if leadingComments != "" {
 			leadingComments += "\n"
@@ -512,12 +522,15 @@
 			{"protobuf_val", fieldProtobufTagValue(val)},
 		}...)
 	}
+	if m.IsTracked {
+		tags = append(tags, gotrackTags...)
+	}
 
 	name := field.GoName
 	if field.Desc.IsWeak() {
 		name = "XXX_weak_" + name
 	}
-	g.Annotate(message.GoIdent.GoName+"."+name, field.Location)
+	g.Annotate(m.GoIdent.GoName+"."+name, field.Location)
 	leadingComments := appendDeprecationSuffix(field.Comments.Leading,
 		field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
 	g.P(leadingComments,
@@ -526,15 +539,15 @@
 	sf.append(field.GoName)
 }
 
-// genDefaultDecls generates consts and vars holding the default
+// genMessageDefaultDecls generates consts and vars holding the default
 // values of fields.
-func genDefaultDecls(g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
+func genMessageDefaultDecls(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
 	var consts, vars []string
-	for _, field := range message.Fields {
+	for _, field := range m.Fields {
 		if !field.Desc.HasDefault() {
 			continue
 		}
-		name := "Default_" + message.GoIdent.GoName + "_" + field.GoName
+		name := "Default_" + m.GoIdent.GoName + "_" + field.GoName
 		goType, _ := fieldGoType(g, f, field)
 		defVal := field.Desc.Default()
 		switch field.Desc.Kind() {
@@ -566,7 +579,7 @@
 		}
 	}
 	if len(consts) > 0 {
-		g.P("// Default values for ", message.GoIdent, " fields.")
+		g.P("// Default values for ", m.GoIdent, " fields.")
 		g.P("const (")
 		for _, s := range consts {
 			g.P(s)
@@ -574,7 +587,7 @@
 		g.P(")")
 	}
 	if len(vars) > 0 {
-		g.P("// Default values for ", message.GoIdent, " fields.")
+		g.P("// Default values for ", m.GoIdent, " fields.")
 		g.P("var (")
 		for _, s := range vars {
 			g.P(s)
@@ -584,40 +597,40 @@
 	g.P()
 }
 
-func genMessageMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
-	genMessageBaseMethods(gen, g, f, message)
-	genMessageGetterMethods(gen, g, f, message)
-	genMessageSetterMethods(gen, g, f, message)
+func genMessageMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
+	genMessageBaseMethods(gen, g, f, m)
+	genMessageGetterMethods(gen, g, f, m)
+	genMessageSetterMethods(gen, g, f, m)
 }
 
-func genMessageBaseMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
+func genMessageBaseMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
 	// Reset method.
-	g.P("func (x *", message.GoIdent, ") Reset() {")
-	g.P("*x = ", message.GoIdent, "{}")
+	g.P("func (x *", m.GoIdent, ") Reset() {")
+	g.P("*x = ", m.GoIdent, "{}")
 	g.P("}")
 	g.P()
 
 	// String method.
-	g.P("func (x *", message.GoIdent, ") String() string {")
+	g.P("func (x *", m.GoIdent, ") String() string {")
 	g.P("return ", protoimplPackage.Ident("X"), ".MessageStringOf(x)")
 	g.P("}")
 	g.P()
 
 	// ProtoMessage method.
-	g.P("func (*", message.GoIdent, ") ProtoMessage() {}")
+	g.P("func (*", m.GoIdent, ") ProtoMessage() {}")
 	g.P()
 
 	// ProtoReflect method.
-	genMessageReflectMethods(gen, g, f, message)
+	genMessageReflectMethods(gen, g, f, m)
 
 	// Descriptor method.
 	if generateRawDescMethods {
 		var indexes []string
-		for i := 1; i < len(message.Location.Path); i += 2 {
-			indexes = append(indexes, strconv.Itoa(int(message.Location.Path[i])))
+		for i := 1; i < len(m.Location.Path); i += 2 {
+			indexes = append(indexes, strconv.Itoa(int(m.Location.Path[i])))
 		}
-		g.P("// Deprecated: Use ", message.GoIdent, ".ProtoReflect.Descriptor instead.")
-		g.P("func (*", message.GoIdent, ") Descriptor() ([]byte, []int) {")
+		g.P("// Deprecated: Use ", m.GoIdent, ".ProtoReflect.Descriptor instead.")
+		g.P("func (*", m.GoIdent, ") Descriptor() ([]byte, []int) {")
 		g.P("return ", rawDescVarName(f), "GZIP(), []int{", strings.Join(indexes, ","), "}")
 		g.P("}")
 		g.P()
@@ -625,9 +638,9 @@
 
 	// ExtensionRangeArray method.
 	if generateExtensionRangeMethods {
-		if extranges := message.Desc.ExtensionRanges(); extranges.Len() > 0 {
+		if extranges := m.Desc.ExtensionRanges(); extranges.Len() > 0 {
 			protoExtRange := protoifacePackage.Ident("ExtensionRangeV1")
-			extRangeVar := "extRange_" + message.GoIdent.GoName
+			extRangeVar := "extRange_" + m.GoIdent.GoName
 			g.P("var ", extRangeVar, " = []", protoExtRange, " {")
 			for i := 0; i < extranges.Len(); i++ {
 				r := extranges.Get(i)
@@ -635,8 +648,8 @@
 			}
 			g.P("}")
 			g.P()
-			g.P("// Deprecated: Use ", message.GoIdent, ".ProtoReflect.Descriptor.ExtensionRanges instead.")
-			g.P("func (*", message.GoIdent, ") ExtensionRangeArray() []", protoExtRange, " {")
+			g.P("// Deprecated: Use ", m.GoIdent, ".ProtoReflect.Descriptor.ExtensionRanges instead.")
+			g.P("func (*", m.GoIdent, ") ExtensionRangeArray() []", protoExtRange, " {")
 			g.P("return ", extRangeVar)
 			g.P("}")
 			g.P()
@@ -644,12 +657,14 @@
 	}
 }
 
-func genMessageGetterMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
-	for _, field := range message.Fields {
+func genMessageGetterMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
+	for _, field := range m.Fields {
+		genNoInterfacePragma(g, m.IsTracked)
+
 		// Getter for parent oneof.
 		if oneof := field.Oneof; oneof != nil && oneof.Fields[0] == field {
-			g.Annotate(message.GoIdent.GoName+".Get"+oneof.GoName, oneof.Location)
-			g.P("func (m *", message.GoIdent.GoName, ") Get", oneof.GoName, "() ", oneofInterfaceName(oneof), " {")
+			g.Annotate(m.GoIdent.GoName+".Get"+oneof.GoName, oneof.Location)
+			g.P("func (m *", m.GoIdent.GoName, ") Get", oneof.GoName, "() ", oneofInterfaceName(oneof), " {")
 			g.P("if m != nil {")
 			g.P("return m.", oneof.GoName)
 			g.P("}")
@@ -660,16 +675,16 @@
 
 		// Getter for message field.
 		goType, pointer := fieldGoType(g, f, field)
-		defaultValue := fieldDefaultValue(g, message, field)
-		g.Annotate(message.GoIdent.GoName+".Get"+field.GoName, field.Location)
+		defaultValue := fieldDefaultValue(g, m, field)
+		g.Annotate(m.GoIdent.GoName+".Get"+field.GoName, field.Location)
 		leadingComments := appendDeprecationSuffix("",
 			field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
 		switch {
 		case field.Desc.IsWeak():
-			g.P(leadingComments, "func (x *", message.GoIdent, ") Get", field.GoName, "() ", protoifacePackage.Ident("MessageV1"), "{")
+			g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", protoifacePackage.Ident("MessageV1"), "{")
 			g.P("if x != nil {")
 			g.P("v := x.XXX_weak[", field.Desc.Number(), "]")
-			g.P("_ = x.XXX_weak_" + field.GoName) // for field tracking
+			g.P("_ = x.XXX_weak_" + field.GoName) // for field-tracking
 			g.P("if v != nil {")
 			g.P("return v")
 			g.P("}")
@@ -677,14 +692,14 @@
 			g.P("return ", protoimplPackage.Ident("X"), ".WeakNil(", strconv.Quote(string(field.Message.Desc.FullName())), ")")
 			g.P("}")
 		case field.Oneof != nil:
-			g.P(leadingComments, "func (x *", message.GoIdent, ") Get", field.GoName, "() ", goType, " {")
+			g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {")
 			g.P("if x, ok := x.Get", field.Oneof.GoName, "().(*", field.GoIdent, "); ok {")
 			g.P("return x.", field.GoName)
 			g.P("}")
 			g.P("return ", defaultValue)
 			g.P("}")
 		default:
-			g.P(leadingComments, "func (x *", message.GoIdent, ") Get", field.GoName, "() ", goType, " {")
+			g.P(leadingComments, "func (x *", m.GoIdent, ") Get", field.GoName, "() ", goType, " {")
 			if field.Desc.Syntax() == protoreflect.Proto3 || defaultValue == "nil" {
 				g.P("if x != nil {")
 			} else {
@@ -703,25 +718,29 @@
 	}
 }
 
-func genMessageSetterMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
-	for _, field := range message.Fields {
-		if field.Desc.IsWeak() {
-			g.Annotate(message.GoIdent.GoName+".Set"+field.GoName, field.Location)
-			leadingComments := appendDeprecationSuffix("",
-				field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
-			g.P(leadingComments, "func (x *", message.GoIdent, ") Set", field.GoName, "(v ", protoifacePackage.Ident("MessageV1"), ") {")
-			g.P("if x.XXX_weak == nil {")
-			g.P("x.XXX_weak = make(", protoimplPackage.Ident("WeakFields"), ")")
-			g.P("}")
-			g.P("if v == nil {")
-			g.P("delete(x.XXX_weak, ", field.Desc.Number(), ")")
-			g.P("} else {")
-			g.P("x.XXX_weak[", field.Desc.Number(), "] = v")
-			g.P("x.XXX_weak_"+field.GoName, " = struct{}{}") // for field tracking
-			g.P("}")
-			g.P("}")
-			g.P()
+func genMessageSetterMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
+	for _, field := range m.Fields {
+		if !field.Desc.IsWeak() {
+			continue
 		}
+
+		genNoInterfacePragma(g, m.IsTracked)
+
+		g.Annotate(m.GoIdent.GoName+".Set"+field.GoName, field.Location)
+		leadingComments := appendDeprecationSuffix("",
+			field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
+		g.P(leadingComments, "func (x *", m.GoIdent, ") Set", field.GoName, "(v ", protoifacePackage.Ident("MessageV1"), ") {")
+		g.P("if x.XXX_weak == nil {")
+		g.P("x.XXX_weak = make(", protoimplPackage.Ident("WeakFields"), ")")
+		g.P("}")
+		g.P("if v == nil {")
+		g.P("delete(x.XXX_weak, ", field.Desc.Number(), ")")
+		g.P("} else {")
+		g.P("x.XXX_weak[", field.Desc.Number(), "] = v")
+		g.P("x.XXX_weak_"+field.GoName, " = struct{}{}") // for field-tracking
+		g.P("}")
+		g.P("}")
+		g.P()
 	}
 }
 
@@ -785,12 +804,12 @@
 	return tag.Marshal(field.Desc, enumName)
 }
 
-func fieldDefaultValue(g *protogen.GeneratedFile, message *protogen.Message, field *protogen.Field) string {
+func fieldDefaultValue(g *protogen.GeneratedFile, m *messageInfo, field *protogen.Field) string {
 	if field.Desc.IsList() {
 		return "nil"
 	}
 	if field.Desc.HasDefault() {
-		defVarName := "Default_" + message.GoIdent.GoName + "_" + field.GoName
+		defVarName := "Default_" + m.GoIdent.GoName + "_" + field.GoName
 		if field.Desc.Kind() == protoreflect.BytesKind {
 			return "append([]byte(nil), " + defVarName + "...)"
 		}
@@ -886,10 +905,10 @@
 	}
 }
 
-// genOneofWrapperTypes generates the oneof wrapper types and
+// genMessageOneofWrapperTypes generates the oneof wrapper types and
 // associates the types with the parent message type.
-func genOneofWrapperTypes(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
-	for _, oneof := range message.Oneofs {
+func genMessageOneofWrapperTypes(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
+	for _, oneof := range m.Oneofs {
 		ifName := oneofInterfaceName(oneof)
 		g.P("type ", ifName, " interface {")
 		g.P(ifName, "()")
@@ -903,6 +922,9 @@
 			tags := structTags{
 				{"protobuf", fieldProtobufTagValue(field)},
 			}
+			if m.IsTracked {
+				tags = append(tags, gotrackTags...)
+			}
 			leadingComments := appendDeprecationSuffix(field.Comments.Leading,
 				field.Desc.Options().(*descriptorpb.FieldOptions).GetDeprecated())
 			g.P(leadingComments,
@@ -924,12 +946,24 @@
 	return "is" + oneof.GoIdent.GoName
 }
 
-var jsonIgnoreTags = structTags{{"json", "-"}}
+// genNoInterfacePragma generates a standalone "nointerface" pragma to
+// decorate methods with field-tracking support.
+func genNoInterfacePragma(g *protogen.GeneratedFile, tracked bool) {
+	if tracked {
+		g.P("//go:nointerface")
+		g.P()
+	}
+}
+
+var (
+	gotrackTags    = structTags{{"go", "track"}}
+	jsonIgnoreTags = structTags{{"json", "-"}}
+)
 
 // structTags is a data structure for build idiomatic Go struct tags.
 // Each [2]string is a key-value pair, where value is the unescaped string.
 //
-// Example: structTags{{"key", "value"}} -> `key:"value"`
+// Example: structTags{{"key", "value"}}.String() -> `key:"value"`
 type structTags [][2]string
 
 func (tags structTags) String() string {
diff --git a/cmd/protoc-gen-go/internal_gengo/reflect.go b/cmd/protoc-gen-go/internal_gengo/reflect.go
index c0f2dfd..073ab01 100644
--- a/cmd/protoc-gen-go/internal_gengo/reflect.go
+++ b/cmd/protoc-gen-go/internal_gengo/reflect.go
@@ -302,12 +302,12 @@
 	g.P()
 }
 
-func genMessageReflectMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, message *protogen.Message) {
-	idx := f.allMessagesByPtr[message]
+func genMessageReflectMethods(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, m *messageInfo) {
+	idx := f.allMessagesByPtr[m.Message]
 	typesVar := messageTypesVarName(f)
 
 	// ProtoReflect method.
-	g.P("func (x *", message.GoIdent, ") ProtoReflect() ", protoreflectPackage.Ident("Message"), " {")
+	g.P("func (x *", m.GoIdent, ") ProtoReflect() ", protoreflectPackage.Ident("Message"), " {")
 	g.P("mi := &", typesVar, "[", idx, "]")
 	if generateMessageStateFields {
 		g.P("if ", protoimplPackage.Ident("UnsafeEnabled"), " && x != nil {")
diff --git a/internal/testprotos/annotation/annotation.pb.go b/internal/testprotos/annotation/annotation.pb.go
new file mode 100644
index 0000000..74b4cdc
--- /dev/null
+++ b/internal/testprotos/annotation/annotation.pb.go
@@ -0,0 +1,106 @@
+// 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: annotation/annotation.proto
+
+package annotation
+
+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"
+)
+
+var file_annotation_annotation_proto_extTypes = []protoimpl.ExtensionInfo{
+	{
+		ExtendedType:  (*descriptorpb.MessageOptions)(nil),
+		ExtensionType: (*bool)(nil),
+		Field:         37383685,
+		Name:          "go_annotation.track_field_use",
+		Tag:           "varint,37383685,opt,name=track_field_use",
+		Filename:      "annotation/annotation.proto",
+	},
+}
+
+// Extension fields to descriptorpb.MessageOptions.
+var (
+	// Setting this on a message enables tracking of which fields in the message
+	// a specific binary might access. As a consequence, it also disables the use
+	// of the message accessor methods to satisfy interfaces: they can only be
+	// called directly.
+	//
+	// optional bool track_field_use = 37383685;
+	E_TrackFieldUse = &file_annotation_annotation_proto_extTypes[0]
+)
+
+var File_annotation_annotation_proto protoreflect.FileDescriptor
+
+var file_annotation_annotation_proto_rawDesc = []byte{
+	0x0a, 0x1b, 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, 0x12, 0x0d, 0x67,
+	0x6f, 0x5f, 0x61, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x1a, 0x20, 0x67, 0x6f,
+	0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x64, 0x65,
+	0x73, 0x63, 0x72, 0x69, 0x70, 0x74, 0x6f, 0x72, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x3a, 0x4a,
+	0x0a, 0x0f, 0x74, 0x72, 0x61, 0x63, 0x6b, 0x5f, 0x66, 0x69, 0x65, 0x6c, 0x64, 0x5f, 0x75, 0x73,
+	0x65, 0x12, 0x1f, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f,
+	0x62, 0x75, 0x66, 0x2e, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x4f, 0x70, 0x74, 0x69, 0x6f,
+	0x6e, 0x73, 0x18, 0x85, 0xdc, 0xe9, 0x11, 0x20, 0x01, 0x28, 0x08, 0x52, 0x0d, 0x74, 0x72, 0x61,
+	0x63, 0x6b, 0x46, 0x69, 0x65, 0x6c, 0x64, 0x55, 0x73, 0x65, 0x42, 0x3b, 0x5a, 0x39, 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, 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,
+}
+
+var (
+	file_annotation_annotation_proto_rawDescOnce sync.Once
+	file_annotation_annotation_proto_rawDescData = file_annotation_annotation_proto_rawDesc
+)
+
+func file_annotation_annotation_proto_rawDescGZIP() []byte {
+	file_annotation_annotation_proto_rawDescOnce.Do(func() {
+		file_annotation_annotation_proto_rawDescData = protoimpl.X.CompressGZIP(file_annotation_annotation_proto_rawDescData)
+	})
+	return file_annotation_annotation_proto_rawDescData
+}
+
+var file_annotation_annotation_proto_goTypes = []interface{}{
+	(*descriptorpb.MessageOptions)(nil), // 0: google.protobuf.MessageOptions
+}
+var file_annotation_annotation_proto_depIdxs = []int32{
+	0, // 0: go_annotation.track_field_use:extendee -> google.protobuf.MessageOptions
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	0, // [0:1] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_annotation_annotation_proto_init() }
+func file_annotation_annotation_proto_init() {
+	if File_annotation_annotation_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_annotation_annotation_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   0,
+			NumExtensions: 1,
+			NumServices:   0,
+		},
+		GoTypes:           file_annotation_annotation_proto_goTypes,
+		DependencyIndexes: file_annotation_annotation_proto_depIdxs,
+		ExtensionInfos:    file_annotation_annotation_proto_extTypes,
+	}.Build()
+	File_annotation_annotation_proto = out.File
+	file_annotation_annotation_proto_rawDesc = nil
+	file_annotation_annotation_proto_goTypes = nil
+	file_annotation_annotation_proto_depIdxs = nil
+}
diff --git a/internal/testprotos/annotation/annotation.proto b/internal/testprotos/annotation/annotation.proto
new file mode 100644
index 0000000..421631e
--- /dev/null
+++ b/internal/testprotos/annotation/annotation.proto
@@ -0,0 +1,19 @@
+// 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 go_annotation;
+
+import "google/protobuf/descriptor.proto";
+
+option go_package = "google.golang.org/protobuf/internal/testprotos/annotation";
+
+extend google.protobuf.MessageOptions {
+  // Setting this on a message enables tracking of which fields in the message
+  // a specific binary might access. As a consequence, it also disables the use
+  // of the message accessor methods to satisfy interfaces: they can only be
+  // called directly.
+  optional bool track_field_use = 37383685;
+}
diff --git a/internal/testprotos/fieldtrack/fieldtrack.pb.go b/internal/testprotos/fieldtrack/fieldtrack.pb.go
new file mode 100644
index 0000000..08bf2fc
--- /dev/null
+++ b/internal/testprotos/fieldtrack/fieldtrack.pb.go
@@ -0,0 +1,1039 @@
+// Copyright 2018 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: fieldtrack/fieldtrack.proto
+
+package fieldtrack
+
+import (
+	_ "google.golang.org/protobuf/internal/testprotos/annotation"
+	test "google.golang.org/protobuf/internal/testprotos/test"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoiface "google.golang.org/protobuf/runtime/protoiface"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+type TestFieldTrack struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	XXX_weak      protoimpl.WeakFields `json:"-"`
+	unknownFields protoimpl.UnknownFields
+
+	OptionalInt32         *int32                                      `protobuf:"varint,1,opt,name=optional_int32,json=optionalInt32" json:"optional_int32,omitempty" go:"track"`
+	OptionalInt64         *int64                                      `protobuf:"varint,2,opt,name=optional_int64,json=optionalInt64" json:"optional_int64,omitempty" go:"track"`
+	OptionalUint32        *uint32                                     `protobuf:"varint,3,opt,name=optional_uint32,json=optionalUint32" json:"optional_uint32,omitempty" go:"track"`
+	OptionalUint64        *uint64                                     `protobuf:"varint,4,opt,name=optional_uint64,json=optionalUint64" json:"optional_uint64,omitempty" go:"track"`
+	OptionalSint32        *int32                                      `protobuf:"zigzag32,5,opt,name=optional_sint32,json=optionalSint32" json:"optional_sint32,omitempty" go:"track"`
+	OptionalSint64        *int64                                      `protobuf:"zigzag64,6,opt,name=optional_sint64,json=optionalSint64" json:"optional_sint64,omitempty" go:"track"`
+	OptionalFixed32       *uint32                                     `protobuf:"fixed32,7,opt,name=optional_fixed32,json=optionalFixed32" json:"optional_fixed32,omitempty" go:"track"`
+	OptionalFixed64       *uint64                                     `protobuf:"fixed64,8,opt,name=optional_fixed64,json=optionalFixed64" json:"optional_fixed64,omitempty" go:"track"`
+	OptionalSfixed32      *int32                                      `protobuf:"fixed32,9,opt,name=optional_sfixed32,json=optionalSfixed32" json:"optional_sfixed32,omitempty" go:"track"`
+	OptionalSfixed64      *int64                                      `protobuf:"fixed64,10,opt,name=optional_sfixed64,json=optionalSfixed64" json:"optional_sfixed64,omitempty" go:"track"`
+	OptionalFloat         *float32                                    `protobuf:"fixed32,11,opt,name=optional_float,json=optionalFloat" json:"optional_float,omitempty" go:"track"`
+	OptionalDouble        *float64                                    `protobuf:"fixed64,12,opt,name=optional_double,json=optionalDouble" json:"optional_double,omitempty" go:"track"`
+	OptionalBool          *bool                                       `protobuf:"varint,13,opt,name=optional_bool,json=optionalBool" json:"optional_bool,omitempty" go:"track"`
+	OptionalString        *string                                     `protobuf:"bytes,14,opt,name=optional_string,json=optionalString" json:"optional_string,omitempty" go:"track"`
+	OptionalBytes         []byte                                      `protobuf:"bytes,15,opt,name=optional_bytes,json=optionalBytes" json:"optional_bytes,omitempty" go:"track"`
+	OptionalEnum          *test.TestAllTypes_NestedEnum               `protobuf:"varint,16,opt,name=optional_enum,json=optionalEnum,enum=goproto.proto.test.TestAllTypes_NestedEnum" json:"optional_enum,omitempty" go:"track"`
+	OptionalMessage       *test.TestAllTypes_NestedMessage            `protobuf:"bytes,17,opt,name=optional_message,json=optionalMessage" json:"optional_message,omitempty" go:"track"`
+	RepeatedInt32         []int32                                     `protobuf:"varint,21,rep,name=repeated_int32,json=repeatedInt32" json:"repeated_int32,omitempty" go:"track"`
+	RepeatedInt64         []int64                                     `protobuf:"varint,22,rep,name=repeated_int64,json=repeatedInt64" json:"repeated_int64,omitempty" go:"track"`
+	RepeatedUint32        []uint32                                    `protobuf:"varint,23,rep,name=repeated_uint32,json=repeatedUint32" json:"repeated_uint32,omitempty" go:"track"`
+	RepeatedUint64        []uint64                                    `protobuf:"varint,24,rep,name=repeated_uint64,json=repeatedUint64" json:"repeated_uint64,omitempty" go:"track"`
+	RepeatedSint32        []int32                                     `protobuf:"zigzag32,25,rep,name=repeated_sint32,json=repeatedSint32" json:"repeated_sint32,omitempty" go:"track"`
+	RepeatedSint64        []int64                                     `protobuf:"zigzag64,26,rep,name=repeated_sint64,json=repeatedSint64" json:"repeated_sint64,omitempty" go:"track"`
+	RepeatedFixed32       []uint32                                    `protobuf:"fixed32,27,rep,name=repeated_fixed32,json=repeatedFixed32" json:"repeated_fixed32,omitempty" go:"track"`
+	RepeatedFixed64       []uint64                                    `protobuf:"fixed64,28,rep,name=repeated_fixed64,json=repeatedFixed64" json:"repeated_fixed64,omitempty" go:"track"`
+	RepeatedSfixed32      []int32                                     `protobuf:"fixed32,29,rep,name=repeated_sfixed32,json=repeatedSfixed32" json:"repeated_sfixed32,omitempty" go:"track"`
+	RepeatedSfixed64      []int64                                     `protobuf:"fixed64,30,rep,name=repeated_sfixed64,json=repeatedSfixed64" json:"repeated_sfixed64,omitempty" go:"track"`
+	RepeatedFloat         []float32                                   `protobuf:"fixed32,31,rep,name=repeated_float,json=repeatedFloat" json:"repeated_float,omitempty" go:"track"`
+	RepeatedDouble        []float64                                   `protobuf:"fixed64,32,rep,name=repeated_double,json=repeatedDouble" json:"repeated_double,omitempty" go:"track"`
+	RepeatedBool          []bool                                      `protobuf:"varint,33,rep,name=repeated_bool,json=repeatedBool" json:"repeated_bool,omitempty" go:"track"`
+	RepeatedString        []string                                    `protobuf:"bytes,34,rep,name=repeated_string,json=repeatedString" json:"repeated_string,omitempty" go:"track"`
+	RepeatedBytes         [][]byte                                    `protobuf:"bytes,35,rep,name=repeated_bytes,json=repeatedBytes" json:"repeated_bytes,omitempty" go:"track"`
+	RepeatedEnum          []test.TestAllTypes_NestedEnum              `protobuf:"varint,36,rep,name=repeated_enum,json=repeatedEnum,enum=goproto.proto.test.TestAllTypes_NestedEnum" json:"repeated_enum,omitempty" go:"track"`
+	RepeatedMessage       []*test.TestAllTypes_NestedMessage          `protobuf:"bytes,37,rep,name=repeated_message,json=repeatedMessage" json:"repeated_message,omitempty" go:"track"`
+	MapStringInt32        map[string]int32                            `protobuf:"bytes,41,rep,name=map_string_int32,json=mapStringInt32" json:"map_string_int32,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"varint,2,opt,name=value" go:"track"`
+	MapStringInt64        map[string]int64                            `protobuf:"bytes,42,rep,name=map_string_int64,json=mapStringInt64" json:"map_string_int64,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"varint,2,opt,name=value" go:"track"`
+	MapStringUint32       map[string]uint32                           `protobuf:"bytes,43,rep,name=map_string_uint32,json=mapStringUint32" json:"map_string_uint32,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"varint,2,opt,name=value" go:"track"`
+	MapStringUint64       map[string]uint64                           `protobuf:"bytes,44,rep,name=map_string_uint64,json=mapStringUint64" json:"map_string_uint64,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"varint,2,opt,name=value" go:"track"`
+	MapStringSint32       map[string]int32                            `protobuf:"bytes,45,rep,name=map_string_sint32,json=mapStringSint32" json:"map_string_sint32,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"zigzag32,2,opt,name=value" go:"track"`
+	MapStringSint64       map[string]int64                            `protobuf:"bytes,46,rep,name=map_string_sint64,json=mapStringSint64" json:"map_string_sint64,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"zigzag64,2,opt,name=value" go:"track"`
+	MapStringFixed32      map[string]uint32                           `protobuf:"bytes,47,rep,name=map_string_fixed32,json=mapStringFixed32" json:"map_string_fixed32,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"fixed32,2,opt,name=value" go:"track"`
+	MapStringFixed64      map[string]uint64                           `protobuf:"bytes,48,rep,name=map_string_fixed64,json=mapStringFixed64" json:"map_string_fixed64,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"fixed64,2,opt,name=value" go:"track"`
+	MapStringSfixed32     map[string]int32                            `protobuf:"bytes,49,rep,name=map_string_sfixed32,json=mapStringSfixed32" json:"map_string_sfixed32,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"fixed32,2,opt,name=value" go:"track"`
+	MapStringSfixed64     map[string]int64                            `protobuf:"bytes,50,rep,name=map_string_sfixed64,json=mapStringSfixed64" json:"map_string_sfixed64,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"fixed64,2,opt,name=value" go:"track"`
+	MapStringFloat        map[string]float32                          `protobuf:"bytes,51,rep,name=map_string_float,json=mapStringFloat" json:"map_string_float,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"fixed32,2,opt,name=value" go:"track"`
+	MapStringDouble       map[string]float64                          `protobuf:"bytes,52,rep,name=map_string_double,json=mapStringDouble" json:"map_string_double,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"fixed64,2,opt,name=value" go:"track"`
+	MapStringBool         map[string]bool                             `protobuf:"bytes,53,rep,name=map_string_bool,json=mapStringBool" json:"map_string_bool,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"varint,2,opt,name=value" go:"track"`
+	MapStringString       map[string]string                           `protobuf:"bytes,54,rep,name=map_string_string,json=mapStringString" json:"map_string_string,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value" go:"track"`
+	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"`
+	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"`
+	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"`
+}
+
+func (x *TestFieldTrack) Reset() {
+	*x = TestFieldTrack{}
+}
+
+func (x *TestFieldTrack) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*TestFieldTrack) ProtoMessage() {}
+
+func (x *TestFieldTrack) ProtoReflect() protoreflect.Message {
+	mi := &file_fieldtrack_fieldtrack_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 TestFieldTrack.ProtoReflect.Descriptor instead.
+func (*TestFieldTrack) Descriptor() ([]byte, []int) {
+	return file_fieldtrack_fieldtrack_proto_rawDescGZIP(), []int{0}
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalInt32() int32 {
+	if x != nil && x.OptionalInt32 != nil {
+		return *x.OptionalInt32
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalInt64() int64 {
+	if x != nil && x.OptionalInt64 != nil {
+		return *x.OptionalInt64
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalUint32() uint32 {
+	if x != nil && x.OptionalUint32 != nil {
+		return *x.OptionalUint32
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalUint64() uint64 {
+	if x != nil && x.OptionalUint64 != nil {
+		return *x.OptionalUint64
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalSint32() int32 {
+	if x != nil && x.OptionalSint32 != nil {
+		return *x.OptionalSint32
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalSint64() int64 {
+	if x != nil && x.OptionalSint64 != nil {
+		return *x.OptionalSint64
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalFixed32() uint32 {
+	if x != nil && x.OptionalFixed32 != nil {
+		return *x.OptionalFixed32
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalFixed64() uint64 {
+	if x != nil && x.OptionalFixed64 != nil {
+		return *x.OptionalFixed64
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalSfixed32() int32 {
+	if x != nil && x.OptionalSfixed32 != nil {
+		return *x.OptionalSfixed32
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalSfixed64() int64 {
+	if x != nil && x.OptionalSfixed64 != nil {
+		return *x.OptionalSfixed64
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalFloat() float32 {
+	if x != nil && x.OptionalFloat != nil {
+		return *x.OptionalFloat
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalDouble() float64 {
+	if x != nil && x.OptionalDouble != nil {
+		return *x.OptionalDouble
+	}
+	return 0
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalBool() bool {
+	if x != nil && x.OptionalBool != nil {
+		return *x.OptionalBool
+	}
+	return false
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalString() string {
+	if x != nil && x.OptionalString != nil {
+		return *x.OptionalString
+	}
+	return ""
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalBytes() []byte {
+	if x != nil {
+		return x.OptionalBytes
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalEnum() test.TestAllTypes_NestedEnum {
+	if x != nil && x.OptionalEnum != nil {
+		return *x.OptionalEnum
+	}
+	return test.TestAllTypes_FOO
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetOptionalMessage() *test.TestAllTypes_NestedMessage {
+	if x != nil {
+		return x.OptionalMessage
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedInt32() []int32 {
+	if x != nil {
+		return x.RepeatedInt32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedInt64() []int64 {
+	if x != nil {
+		return x.RepeatedInt64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedUint32() []uint32 {
+	if x != nil {
+		return x.RepeatedUint32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedUint64() []uint64 {
+	if x != nil {
+		return x.RepeatedUint64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedSint32() []int32 {
+	if x != nil {
+		return x.RepeatedSint32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedSint64() []int64 {
+	if x != nil {
+		return x.RepeatedSint64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedFixed32() []uint32 {
+	if x != nil {
+		return x.RepeatedFixed32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedFixed64() []uint64 {
+	if x != nil {
+		return x.RepeatedFixed64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedSfixed32() []int32 {
+	if x != nil {
+		return x.RepeatedSfixed32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedSfixed64() []int64 {
+	if x != nil {
+		return x.RepeatedSfixed64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedFloat() []float32 {
+	if x != nil {
+		return x.RepeatedFloat
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedDouble() []float64 {
+	if x != nil {
+		return x.RepeatedDouble
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedBool() []bool {
+	if x != nil {
+		return x.RepeatedBool
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedString() []string {
+	if x != nil {
+		return x.RepeatedString
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedBytes() [][]byte {
+	if x != nil {
+		return x.RepeatedBytes
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedEnum() []test.TestAllTypes_NestedEnum {
+	if x != nil {
+		return x.RepeatedEnum
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetRepeatedMessage() []*test.TestAllTypes_NestedMessage {
+	if x != nil {
+		return x.RepeatedMessage
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringInt32() map[string]int32 {
+	if x != nil {
+		return x.MapStringInt32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringInt64() map[string]int64 {
+	if x != nil {
+		return x.MapStringInt64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringUint32() map[string]uint32 {
+	if x != nil {
+		return x.MapStringUint32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringUint64() map[string]uint64 {
+	if x != nil {
+		return x.MapStringUint64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringSint32() map[string]int32 {
+	if x != nil {
+		return x.MapStringSint32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringSint64() map[string]int64 {
+	if x != nil {
+		return x.MapStringSint64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringFixed32() map[string]uint32 {
+	if x != nil {
+		return x.MapStringFixed32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringFixed64() map[string]uint64 {
+	if x != nil {
+		return x.MapStringFixed64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringSfixed32() map[string]int32 {
+	if x != nil {
+		return x.MapStringSfixed32
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringSfixed64() map[string]int64 {
+	if x != nil {
+		return x.MapStringSfixed64
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringFloat() map[string]float32 {
+	if x != nil {
+		return x.MapStringFloat
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringDouble() map[string]float64 {
+	if x != nil {
+		return x.MapStringDouble
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringBool() map[string]bool {
+	if x != nil {
+		return x.MapStringBool
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringString() map[string]string {
+	if x != nil {
+		return x.MapStringString
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringBytes() map[string][]byte {
+	if x != nil {
+		return x.MapStringBytes
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringEnum() map[string]test.TestAllTypes_NestedEnum {
+	if x != nil {
+		return x.MapStringEnum
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetMapStringMessage() map[string]*test.TestAllTypes_NestedMessage {
+	if x != nil {
+		return x.MapStringMessage
+	}
+	return nil
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetWeakMessage1() protoiface.MessageV1 {
+	if x != nil {
+		v := x.XXX_weak[100]
+		_ = x.XXX_weak_WeakMessage1
+		if v != nil {
+			return v
+		}
+	}
+	return protoimpl.X.WeakNil("goproto.proto.test.weak.WeakImportMessage1")
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) GetWeakMessage2() protoiface.MessageV1 {
+	if x != nil {
+		v := x.XXX_weak[101]
+		_ = x.XXX_weak_WeakMessage2
+		if v != nil {
+			return v
+		}
+	}
+	return protoimpl.X.WeakNil("goproto.proto.test.weak.WeakImportMessage2")
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) SetWeakMessage1(v protoiface.MessageV1) {
+	if x.XXX_weak == nil {
+		x.XXX_weak = make(protoimpl.WeakFields)
+	}
+	if v == nil {
+		delete(x.XXX_weak, 100)
+	} else {
+		x.XXX_weak[100] = v
+		x.XXX_weak_WeakMessage1 = struct{}{}
+	}
+}
+
+//go:nointerface
+
+func (x *TestFieldTrack) SetWeakMessage2(v protoiface.MessageV1) {
+	if x.XXX_weak == nil {
+		x.XXX_weak = make(protoimpl.WeakFields)
+	}
+	if v == nil {
+		delete(x.XXX_weak, 101)
+	} else {
+		x.XXX_weak[101] = v
+		x.XXX_weak_WeakMessage2 = struct{}{}
+	}
+}
+
+var File_fieldtrack_fieldtrack_proto protoreflect.FileDescriptor
+
+var file_fieldtrack_fieldtrack_proto_rawDesc = []byte{
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+	0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28,
+	0x09, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x44, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18,
+	0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x2e, 0x2e, 0x67, 0x6f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x54, 0x65, 0x73, 0x74, 0x41,
+	0x6c, 0x6c, 0x54, 0x79, 0x70, 0x65, 0x73, 0x2e, 0x4e, 0x65, 0x73, 0x74, 0x65, 0x64, 0x4d, 0x65,
+	0x73, 0x73, 0x61, 0x67, 0x65, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01,
+	0x3a, 0x06, 0xa8, 0xe0, 0xcd, 0x8e, 0x01, 0x01, 0x42, 0x3b, 0x5a, 0x39, 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, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f,
+	0x74, 0x65, 0x73, 0x74, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x73, 0x2f, 0x66, 0x69, 0x65, 0x6c, 0x64,
+	0x74, 0x72, 0x61, 0x63, 0x6b, 0x58, 0x02, 0x58, 0x03,
+}
+
+var (
+	file_fieldtrack_fieldtrack_proto_rawDescOnce sync.Once
+	file_fieldtrack_fieldtrack_proto_rawDescData = file_fieldtrack_fieldtrack_proto_rawDesc
+)
+
+func file_fieldtrack_fieldtrack_proto_rawDescGZIP() []byte {
+	file_fieldtrack_fieldtrack_proto_rawDescOnce.Do(func() {
+		file_fieldtrack_fieldtrack_proto_rawDescData = protoimpl.X.CompressGZIP(file_fieldtrack_fieldtrack_proto_rawDescData)
+	})
+	return file_fieldtrack_fieldtrack_proto_rawDescData
+}
+
+var file_fieldtrack_fieldtrack_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
+var file_fieldtrack_fieldtrack_proto_goTypes = []interface{}{
+	(*TestFieldTrack)(nil),                  // 0: goproto.proto.test.TestFieldTrack
+	nil,                                     // 1: goproto.proto.test.TestFieldTrack.MapStringInt32Entry
+	nil,                                     // 2: goproto.proto.test.TestFieldTrack.MapStringInt64Entry
+	nil,                                     // 3: goproto.proto.test.TestFieldTrack.MapStringUint32Entry
+	nil,                                     // 4: goproto.proto.test.TestFieldTrack.MapStringUint64Entry
+	nil,                                     // 5: goproto.proto.test.TestFieldTrack.MapStringSint32Entry
+	nil,                                     // 6: goproto.proto.test.TestFieldTrack.MapStringSint64Entry
+	nil,                                     // 7: goproto.proto.test.TestFieldTrack.MapStringFixed32Entry
+	nil,                                     // 8: goproto.proto.test.TestFieldTrack.MapStringFixed64Entry
+	nil,                                     // 9: goproto.proto.test.TestFieldTrack.MapStringSfixed32Entry
+	nil,                                     // 10: goproto.proto.test.TestFieldTrack.MapStringSfixed64Entry
+	nil,                                     // 11: goproto.proto.test.TestFieldTrack.MapStringFloatEntry
+	nil,                                     // 12: goproto.proto.test.TestFieldTrack.MapStringDoubleEntry
+	nil,                                     // 13: goproto.proto.test.TestFieldTrack.MapStringBoolEntry
+	nil,                                     // 14: goproto.proto.test.TestFieldTrack.MapStringStringEntry
+	nil,                                     // 15: goproto.proto.test.TestFieldTrack.MapStringBytesEntry
+	nil,                                     // 16: goproto.proto.test.TestFieldTrack.MapStringEnumEntry
+	nil,                                     // 17: goproto.proto.test.TestFieldTrack.MapStringMessageEntry
+	(test.TestAllTypes_NestedEnum)(0),       // 18: goproto.proto.test.TestAllTypes.NestedEnum
+	(*test.TestAllTypes_NestedMessage)(nil), // 19: goproto.proto.test.TestAllTypes.NestedMessage
+}
+var file_fieldtrack_fieldtrack_proto_depIdxs = []int32{
+	18, // 0: goproto.proto.test.TestFieldTrack.optional_enum:type_name -> goproto.proto.test.TestAllTypes.NestedEnum
+	19, // 1: goproto.proto.test.TestFieldTrack.optional_message:type_name -> goproto.proto.test.TestAllTypes.NestedMessage
+	18, // 2: goproto.proto.test.TestFieldTrack.repeated_enum:type_name -> goproto.proto.test.TestAllTypes.NestedEnum
+	19, // 3: goproto.proto.test.TestFieldTrack.repeated_message:type_name -> goproto.proto.test.TestAllTypes.NestedMessage
+	1,  // 4: goproto.proto.test.TestFieldTrack.map_string_int32:type_name -> goproto.proto.test.TestFieldTrack.MapStringInt32Entry
+	2,  // 5: goproto.proto.test.TestFieldTrack.map_string_int64:type_name -> goproto.proto.test.TestFieldTrack.MapStringInt64Entry
+	3,  // 6: goproto.proto.test.TestFieldTrack.map_string_uint32:type_name -> goproto.proto.test.TestFieldTrack.MapStringUint32Entry
+	4,  // 7: goproto.proto.test.TestFieldTrack.map_string_uint64:type_name -> goproto.proto.test.TestFieldTrack.MapStringUint64Entry
+	5,  // 8: goproto.proto.test.TestFieldTrack.map_string_sint32:type_name -> goproto.proto.test.TestFieldTrack.MapStringSint32Entry
+	6,  // 9: goproto.proto.test.TestFieldTrack.map_string_sint64:type_name -> goproto.proto.test.TestFieldTrack.MapStringSint64Entry
+	7,  // 10: goproto.proto.test.TestFieldTrack.map_string_fixed32:type_name -> goproto.proto.test.TestFieldTrack.MapStringFixed32Entry
+	8,  // 11: goproto.proto.test.TestFieldTrack.map_string_fixed64:type_name -> goproto.proto.test.TestFieldTrack.MapStringFixed64Entry
+	9,  // 12: goproto.proto.test.TestFieldTrack.map_string_sfixed32:type_name -> goproto.proto.test.TestFieldTrack.MapStringSfixed32Entry
+	10, // 13: goproto.proto.test.TestFieldTrack.map_string_sfixed64:type_name -> goproto.proto.test.TestFieldTrack.MapStringSfixed64Entry
+	11, // 14: goproto.proto.test.TestFieldTrack.map_string_float:type_name -> goproto.proto.test.TestFieldTrack.MapStringFloatEntry
+	12, // 15: goproto.proto.test.TestFieldTrack.map_string_double:type_name -> goproto.proto.test.TestFieldTrack.MapStringDoubleEntry
+	13, // 16: goproto.proto.test.TestFieldTrack.map_string_bool:type_name -> goproto.proto.test.TestFieldTrack.MapStringBoolEntry
+	14, // 17: goproto.proto.test.TestFieldTrack.map_string_string:type_name -> goproto.proto.test.TestFieldTrack.MapStringStringEntry
+	15, // 18: goproto.proto.test.TestFieldTrack.map_string_bytes:type_name -> goproto.proto.test.TestFieldTrack.MapStringBytesEntry
+	16, // 19: goproto.proto.test.TestFieldTrack.map_string_enum:type_name -> goproto.proto.test.TestFieldTrack.MapStringEnumEntry
+	17, // 20: goproto.proto.test.TestFieldTrack.map_string_message:type_name -> goproto.proto.test.TestFieldTrack.MapStringMessageEntry
+	18, // 21: goproto.proto.test.TestFieldTrack.MapStringEnumEntry.value:type_name -> goproto.proto.test.TestAllTypes.NestedEnum
+	19, // 22: goproto.proto.test.TestFieldTrack.MapStringMessageEntry.value:type_name -> goproto.proto.test.TestAllTypes.NestedMessage
+	23, // [23:23] is the sub-list for method output_type
+	23, // [23:23] is the sub-list for method input_type
+	23, // [23:23] is the sub-list for extension type_name
+	23, // [23:23] is the sub-list for extension extendee
+	0,  // [0:23] is the sub-list for field type_name
+}
+
+func init() { file_fieldtrack_fieldtrack_proto_init() }
+func file_fieldtrack_fieldtrack_proto_init() {
+	if File_fieldtrack_fieldtrack_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_fieldtrack_fieldtrack_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TestFieldTrack); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 3:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_fieldtrack_fieldtrack_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   18,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_fieldtrack_fieldtrack_proto_goTypes,
+		DependencyIndexes: file_fieldtrack_fieldtrack_proto_depIdxs,
+		MessageInfos:      file_fieldtrack_fieldtrack_proto_msgTypes,
+	}.Build()
+	File_fieldtrack_fieldtrack_proto = out.File
+	file_fieldtrack_fieldtrack_proto_rawDesc = nil
+	file_fieldtrack_fieldtrack_proto_goTypes = nil
+	file_fieldtrack_fieldtrack_proto_depIdxs = nil
+}
diff --git a/internal/testprotos/fieldtrack/fieldtrack.proto b/internal/testprotos/fieldtrack/fieldtrack.proto
new file mode 100644
index 0000000..3f3f9e6
--- /dev/null
+++ b/internal/testprotos/fieldtrack/fieldtrack.proto
@@ -0,0 +1,75 @@
+// Copyright 2018 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;
+
+import "annotation/annotation.proto";
+import "test/test.proto";
+import weak "test/weak1/test_weak.proto";
+import weak "test/weak2/test_weak.proto";
+
+option go_package = "google.golang.org/protobuf/internal/testprotos/fieldtrack";
+
+message TestFieldTrack {
+  option (go_annotation.track_field_use) = true;
+
+  optional int32    optional_int32    =  1;
+  optional int64    optional_int64    =  2;
+  optional uint32   optional_uint32   =  3;
+  optional uint64   optional_uint64   =  4;
+  optional sint32   optional_sint32   =  5;
+  optional sint64   optional_sint64   =  6;
+  optional fixed32  optional_fixed32  =  7;
+  optional fixed64  optional_fixed64  =  8;
+  optional sfixed32 optional_sfixed32 =  9;
+  optional sfixed64 optional_sfixed64 = 10;
+  optional float    optional_float    = 11;
+  optional double   optional_double   = 12;
+  optional bool     optional_bool     = 13;
+  optional string   optional_string   = 14;
+  optional bytes    optional_bytes    = 15;
+  optional goproto.proto.test.TestAllTypes.NestedEnum    optional_enum    = 16;
+  optional goproto.proto.test.TestAllTypes.NestedMessage optional_message = 17;
+
+  repeated int32    repeated_int32    = 21;
+  repeated int64    repeated_int64    = 22;
+  repeated uint32   repeated_uint32   = 23;
+  repeated uint64   repeated_uint64   = 24;
+  repeated sint32   repeated_sint32   = 25;
+  repeated sint64   repeated_sint64   = 26;
+  repeated fixed32  repeated_fixed32  = 27;
+  repeated fixed64  repeated_fixed64  = 28;
+  repeated sfixed32 repeated_sfixed32 = 29;
+  repeated sfixed64 repeated_sfixed64 = 30;
+  repeated float    repeated_float    = 31;
+  repeated double   repeated_double   = 32;
+  repeated bool     repeated_bool     = 33;
+  repeated string   repeated_string   = 34;
+  repeated bytes    repeated_bytes    = 35;
+  repeated goproto.proto.test.TestAllTypes.NestedEnum    repeated_enum    = 36;
+  repeated goproto.proto.test.TestAllTypes.NestedMessage repeated_message = 37;
+
+  map <string, int32>    map_string_int32    = 41;
+  map <string, int64>    map_string_int64    = 42;
+  map <string, uint32>   map_string_uint32   = 43;
+  map <string, uint64>   map_string_uint64   = 44;
+  map <string, sint32>   map_string_sint32   = 45;
+  map <string, sint64>   map_string_sint64   = 46;
+  map <string, fixed32>  map_string_fixed32  = 47;
+  map <string, fixed64>  map_string_fixed64  = 48;
+  map <string, sfixed32> map_string_sfixed32 = 49;
+  map <string, sfixed64> map_string_sfixed64 = 50;
+  map <string, float>    map_string_float    = 51;
+  map <string, double>   map_string_double   = 52;
+  map <string, bool>     map_string_bool     = 53;
+  map <string, string>   map_string_string   = 54;
+  map <string, bytes>    map_string_bytes    = 55;
+  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];
+}