cmd/protoc-gen-go: fix forwarding decls for inf and NaN defaults

Floating-point defaults of -inf, +inf, and NaN must be generated as
vars rather than consts. Fix the forwarding declaration for public
imports of these vars. (Was "const", is now "var".)

Change-Id: Ic6dc90ab7f88378ba477bff39e047de5f5193c35
Reviewed-on: https://go-review.googlesource.com/c/151757
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>

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

@@ -172,8 +172,14 @@ func genImport(gen *protogen.Plugin, g *protogen.GeneratedFile, f *fileInfo, imp
 				GoName:       "Default_" + message.GoIdent.GoName + "_" + field.GoName,
 			}
 			decl := "const"
-			if field.Desc.Kind() == protoreflect.BytesKind {
+			switch field.Desc.Kind() {
+			case protoreflect.BytesKind:
 				decl = "var"
+			case protoreflect.FloatKind, protoreflect.DoubleKind:
+				f := field.Desc.Default().Float()
+				if math.IsInf(f, -1) || math.IsInf(f, 1) || math.IsNaN(f) {
+					decl = "var"
+				}
 			}
 			g.P(decl, " ", defVar.GoName, " = ", defVar)
 		}

cmd/protoc-gen-go/testdata/import_public/a.pb.go

@@ -23,6 +23,9 @@ const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
 
 const Default_M_S = sub.Default_M_S
 
+var Default_M_B = sub.Default_M_B
+var Default_M_F = sub.Default_M_F
+
 // M from public import import_public/sub/a.proto
 type M = sub.M
 type M_OneofInt32 = sub.M_OneofInt32

cmd/protoc-gen-go/testdata/import_public/sub/a.pb.go

@@ -133,8 +133,10 @@ func (M_Submessage_Submessage_Subenum) EnumDescriptor() ([]byte, []int) {
 
 type M struct {
 	// Field using a type in the same Go package, but a different source file.
-	M2 *M2     `protobuf:"bytes,1,opt,name=m2" json:"m2,omitempty"`
-	S  *string `protobuf:"bytes,4,opt,name=s,def=default" json:"s,omitempty"`
+	M2 *M2      `protobuf:"bytes,1,opt,name=m2" json:"m2,omitempty"`
+	S  *string  `protobuf:"bytes,4,opt,name=s,def=default" json:"s,omitempty"`
+	B  []byte   `protobuf:"bytes,5,opt,name=b,def=default" json:"b,omitempty"`
+	F  *float64 `protobuf:"fixed64,6,opt,name=f,def=nan" json:"f,omitempty"`
 	// Types that are valid to be assigned to OneofField:
 	//	*M_OneofInt32
 	//	*M_OneofInt64
@@ -180,6 +182,9 @@ var xxx_messageInfo_M proto.InternalMessageInfo
 
 const Default_M_S string = "default"
 
+var Default_M_B []byte = []byte("default")
+var Default_M_F float64 = math.NaN()
+
 func (m *M) GetM2() *M2 {
 	if m != nil {
 		return m.M2
@@ -194,6 +199,20 @@ func (m *M) GetS() string {
 	return Default_M_S
 }
 
+func (m *M) GetB() []byte {
+	if m != nil && m.B != nil {
+		return m.B
+	}
+	return append([]byte(nil), Default_M_B...)
+}
+
+func (m *M) GetF() float64 {
+	if m != nil && m.F != nil {
+		return *m.F
+	}
+	return Default_M_F
+}
+
 type isM_OneofField interface {
 	isM_OneofField()
 }
@@ -340,29 +359,31 @@ func init() {
 func init() { proto.RegisterFile("import_public/sub/a.proto", fileDescriptor_382f7805394b5c4e) }
 
 var fileDescriptor_382f7805394b5c4e = []byte{
-	// 377 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x92, 0xcf, 0x8f, 0x93, 0x40,
-	0x14, 0xc7, 0x77, 0x60, 0x75, 0xeb, 0xdb, 0xac, 0xae, 0x13, 0x6b, 0x70, 0x4f, 0x58, 0x3d, 0x90,
-	0x35, 0x65, 0x12, 0x24, 0x1c, 0x7a, 0x93, 0x04, 0x7f, 0xa5, 0xa4, 0x09, 0xc4, 0x4b, 0x2f, 0x84,
-	0x81, 0x01, 0x49, 0x80, 0x69, 0x3a, 0x33, 0xc6, 0x23, 0x7f, 0x80, 0xff, 0x95, 0xff, 0x98, 0x29,
-	0xf4, 0x67, 0xac, 0x71, 0x6f, 0xbc, 0xc7, 0xe7, 0xf3, 0x7d, 0x93, 0x79, 0x03, 0xaf, 0xaa, 0x66,
-	0xc5, 0xd7, 0x32, 0x59, 0x29, 0x5a, 0x57, 0x19, 0x11, 0x8a, 0x92, 0xd4, 0x5e, 0xad, 0xb9, 0xe4,
-	0xd8, 0x2c, 0x79, 0xff, 0x31, 0x94, 0x99, 0x7d, 0x42, 0xda, 0x42, 0xd1, 0xbb, 0x33, 0x32, 0x1d,
-	0xe8, 0xc9, 0x2f, 0x1d, 0x50, 0x88, 0x5d, 0xd0, 0x1a, 0xc7, 0x40, 0x26, 0xb2, 0xae, 0x9d, 0xb7,
-	0xf6, 0xff, 0xf2, 0xec, 0xd0, 0x89, 0xb4, 0xc6, 0xc1, 0x63, 0x40, 0xc2, 0xb8, 0x34, 0x91, 0xf5,
-	0x64, 0x76, 0x95, 0xb3, 0x22, 0x55, 0xb5, 0x8c, 0x90, 0xc0, 0xaf, 0xe1, 0x9a, 0xb7, 0x8c, 0x17,
-	0x49, 0xd5, 0xca, 0xf7, 0x8e, 0xa1, 0x99, 0xc8, 0x7a, 0xf4, 0xf9, 0x22, 0x82, 0xbe, 0xf9, 0x65,
-	0xd3, 0x3b, 0x41, 0x3c, 0xd7, 0xd0, 0x4d, 0x64, 0xe9, 0xc7, 0x88, 0xe7, 0xde, 0xfd, 0x46, 0x00,
-	0xb1, 0xa2, 0x0d, 0x13, 0x22, 0x2d, 0x19, 0xf6, 0xe0, 0xa5, 0xd8, 0x57, 0xc9, 0x71, 0x3e, 0xda,
-	0xe6, 0xbf, 0x38, 0xfc, 0x5f, 0x1c, 0x26, 0xfd, 0xc3, 0xf3, 0xdc, 0xfe, 0x5c, 0xfa, 0x79, 0xcf,
-	0x73, 0x27, 0xef, 0x00, 0x1f, 0xa6, 0x27, 0xb1, 0xa2, 0xac, 0x55, 0x0d, 0x1e, 0xc3, 0xf3, 0x30,
-	0x89, 0xbf, 0xf9, 0x61, 0x10, 0xc7, 0x1f, 0x3e, 0x05, 0xc9, 0x32, 0x88, 0x16, 0xb7, 0x17, 0xbe,
-	0x71, 0x66, 0x48, 0x51, 0xb1, 0x3a, 0x9f, 0x8c, 0xe1, 0x6a, 0xe7, 0x02, 0x3c, 0x0e, 0xb7, 0xc2,
-	0xfd, 0x68, 0x94, 0xdf, 0x76, 0x5d, 0xd7, 0x69, 0xfe, 0xcd, 0xee, 0x26, 0x7a, 0xfe, 0xfe, 0x06,
-	0x50, 0x80, 0x47, 0x70, 0x39, 0x70, 0xb3, 0x39, 0x3c, 0x63, 0x3f, 0x25, 0x6b, 0x45, 0xc5, 0xdb,
-	0x81, 0xc0, 0x6f, 0x1e, 0xb0, 0x1e, 0x23, 0xdf, 0x2c, 0x25, 0x7a, 0xba, 0x77, 0x3f, 0x6e, 0x54,
-	0x7f, 0xbe, 0xfc, 0x5a, 0x56, 0xf2, 0xbb, 0xa2, 0x76, 0xc6, 0x1b, 0x52, 0xf2, 0x3a, 0x6d, 0x4b,
-	0xd2, 0xa7, 0x50, 0x55, 0x90, 0x1f, 0x0e, 0xc9, 0x9a, 0x7c, 0xa8, 0xb3, 0x69, 0xc9, 0xda, 0x69,
-	0xc9, 0x89, 0x64, 0x42, 0xe6, 0xa9, 0x4c, 0xc9, 0x5f, 0x2f, 0xe8, 0x4f, 0x00, 0x00, 0x00, 0xff,
-	0xff, 0xcd, 0x86, 0xfe, 0xf7, 0x92, 0x02, 0x00, 0x00,
+	// 402 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x92, 0xcb, 0x6e, 0xd3, 0x40,
+	0x14, 0x86, 0x7b, 0xe2, 0x5e, 0xc2, 0x29, 0x85, 0x76, 0x44, 0xd0, 0xd0, 0x95, 0x09, 0x2c, 0xac,
+	0xa2, 0x7a, 0x24, 0x63, 0x79, 0x91, 0x1d, 0x91, 0xc2, 0x4d, 0xb5, 0x2a, 0xd9, 0x62, 0xd3, 0x8d,
+	0xe5, 0xb1, 0xc7, 0xc6, 0x52, 0x3c, 0x13, 0x75, 0x66, 0x10, 0xcb, 0x3c, 0x15, 0x2f, 0xc0, 0x8b,
+	0xa1, 0xd8, 0x6d, 0x93, 0x88, 0x20, 0xba, 0xf3, 0xf9, 0xfd, 0x7d, 0xff, 0xb1, 0x3c, 0x83, 0xaf,
+	0x9a, 0x76, 0xa1, 0x6e, 0x4d, 0xb6, 0xb0, 0x7c, 0xde, 0x14, 0x4c, 0x5b, 0xce, 0x72, 0x7f, 0x71,
+	0xab, 0x8c, 0x22, 0x6e, 0xad, 0xba, 0x87, 0x7e, 0x2c, 0xfc, 0x2d, 0xd2, 0xd7, 0x96, 0x9f, 0xef,
+	0x90, 0x79, 0x4f, 0x8f, 0x7f, 0x39, 0x08, 0x31, 0x09, 0x71, 0xd0, 0x06, 0x14, 0x5c, 0xf0, 0x8e,
+	0x83, 0xb7, 0xfe, 0xff, 0xfa, 0xfc, 0x38, 0x48, 0x06, 0x6d, 0x40, 0x46, 0x08, 0x9a, 0xee, 0xbb,
+	0xe0, 0x3d, 0x99, 0x1c, 0x95, 0xa2, 0xca, 0xed, 0xdc, 0x24, 0xa0, 0x57, 0x31, 0xa7, 0x07, 0x2e,
+	0x78, 0x4f, 0x37, 0x62, 0x4e, 0xce, 0x10, 0x2a, 0x7a, 0xe8, 0x82, 0x07, 0x13, 0x47, 0xe6, 0x32,
+	0x81, 0x8a, 0xbc, 0xc6, 0x63, 0x25, 0x85, 0xaa, 0xb2, 0x46, 0x9a, 0xf7, 0x01, 0x1d, 0xb8, 0xe0,
+	0x1d, 0x7c, 0xde, 0x4b, 0xb0, 0x0b, 0xbf, 0xac, 0xb2, 0x2d, 0x24, 0x0a, 0xa9, 0xe3, 0x82, 0xe7,
+	0x6c, 0x22, 0x51, 0x78, 0xfe, 0x1b, 0x10, 0x53, 0xcb, 0x5b, 0xa1, 0x75, 0x5e, 0x0b, 0x12, 0xe1,
+	0x4b, 0xfd, 0x30, 0x65, 0x9b, 0xfd, 0x70, 0xd7, 0xff, 0x62, 0xfd, 0xfe, 0x7a, 0xbd, 0xe9, 0x1f,
+	0x5e, 0x14, 0x76, 0xdf, 0xe5, 0xec, 0xf6, 0xa2, 0x70, 0xfc, 0x0e, 0xc9, 0x7a, 0x7b, 0x96, 0x5a,
+	0x2e, 0xa4, 0x6d, 0xc9, 0x08, 0xcf, 0xe2, 0x2c, 0xfd, 0x36, 0x8d, 0x67, 0x69, 0xfa, 0xe1, 0xd3,
+	0x2c, 0xbb, 0x99, 0x25, 0xd7, 0xa7, 0x7b, 0x53, 0xba, 0x63, 0x49, 0xd5, 0x88, 0x79, 0x39, 0x1e,
+	0xe1, 0xd1, 0xbd, 0x8b, 0x78, 0x18, 0xdf, 0x09, 0x17, 0xc3, 0x61, 0x79, 0xba, 0x5c, 0x2e, 0x97,
+	0x83, 0xe9, 0xc9, 0xfd, 0x9f, 0xe8, 0xf8, 0x8b, 0x13, 0x84, 0x19, 0x19, 0xe2, 0x7e, 0xcf, 0x4d,
+	0xae, 0xf0, 0xb9, 0xf8, 0x69, 0x84, 0xd4, 0x8d, 0x92, 0x3d, 0x41, 0xde, 0x3c, 0xe2, 0x20, 0x69,
+	0xb9, 0x3a, 0xbe, 0xe4, 0xd9, 0x83, 0xfb, 0x71, 0xa5, 0x4e, 0xaf, 0x6e, 0xbe, 0xd6, 0x8d, 0xf9,
+	0x6e, 0xb9, 0x5f, 0xa8, 0x96, 0xd5, 0x6a, 0x9e, 0xcb, 0x9a, 0x75, 0x2d, 0xdc, 0x56, 0xec, 0x47,
+	0xc0, 0x8a, 0xb6, 0xec, 0xe7, 0xe2, 0xb2, 0x16, 0xf2, 0xb2, 0x56, 0xcc, 0x08, 0x6d, 0xca, 0xdc,
+	0xe4, 0xec, 0xaf, 0xbb, 0xf6, 0x27, 0x00, 0x00, 0xff, 0xff, 0xfb, 0xa9, 0x17, 0xb5, 0xbc, 0x02,
+	0x00, 0x00,
 }

cmd/protoc-gen-go/testdata/import_public/sub/a.proto

@@ -14,6 +14,8 @@ message M {
   // Field using a type in the same Go package, but a different source file.
   optional M2 m2 = 1;
   optional string s = 4 [default="default"];
+  optional bytes b = 5 [default="default"];
+  optional double f = 6 [default=nan];
 
   oneof oneof_field {
     int32 oneof_int32 = 2;