runtime: provide gc maps for the reflect.callXX frames.

Update #8030

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/100620045

src/cmd/5a/a.y

@@ -336,7 +336,7 @@ inst:
 	{
 		if($2.type != D_CONST)
 			yyerror("index for FUNCDATA must be integer constant");
-		if($4.type != D_EXTERN && $4.type != D_STATIC)
+		if($4.type != D_EXTERN && $4.type != D_STATIC && $4.type != D_OREG)
 			yyerror("value for FUNCDATA must be symbol reference");
  		outcode($1, Always, &$2, NREG, &$4);
 	}

src/cmd/5a/y.tab.c

@@ -2120,7 +2120,7 @@ yyreduce:
     {
 		if((yyvsp[(2) - (4)].addr).type != D_CONST)
 			yyerror("index for FUNCDATA must be integer constant");
-		if((yyvsp[(4) - (4)].addr).type != D_EXTERN && (yyvsp[(4) - (4)].addr).type != D_STATIC)
+		if((yyvsp[(4) - (4)].addr).type != D_EXTERN && (yyvsp[(4) - (4)].addr).type != D_STATIC && (yyvsp[(4) - (4)].addr).type != D_OREG)
 			yyerror("value for FUNCDATA must be symbol reference");
  		outcode((yyvsp[(1) - (4)].lval), Always, &(yyvsp[(2) - (4)].addr), NREG, &(yyvsp[(4) - (4)].addr));
 	}

src/pkg/runtime/asm_386.s

@@ -343,8 +343,22 @@ TEXT reflect·call(SB), NOSPLIT, $0-16
 	MOVL	$runtime·badreflectcall(SB), AX
 	JMP	AX
 
+// Argument map for the callXX frames.  Each has one
+// stack map (for the single call) with 3 arguments.
+DATA gcargs_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gcargs_reflectcall<>+0x04(SB)/4, $6  // 3 args
+DATA gcargs_reflectcall<>+0x08(SB)/4, $(const_BitsPointer+(const_BitsPointer<<2)+(const_BitsScalar<<4))
+GLOBL gcargs_reflectcall<>(SB),RODATA,$12
+
+// callXX frames have no locals
+DATA gclocals_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gclocals_reflectcall<>+0x04(SB)/4, $0  // 0 locals
+GLOBL gclocals_reflectcall<>(SB),RODATA,$8
+
 #define CALLFN(NAME,MAXSIZE)			\
 TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-16;	\
+	FUNCDATA $FUNCDATA_ArgsPointerMaps,gcargs_reflectcall<>(SB);	\
+	FUNCDATA $FUNCDATA_LocalsPointerMaps,gclocals_reflectcall<>(SB);\
 	/* copy arguments to stack */		\
 	MOVL	argptr+4(FP), SI;		\
 	MOVL	argsize+8(FP), CX;		\
@@ -353,6 +367,7 @@ TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-16;	\
 	/* call function */			\
 	MOVL	f+0(FP), DX;			\
 	MOVL	(DX), AX; 			\
+	PCDATA  $PCDATA_StackMapIndex, $0;	\
 	CALL	AX;				\
 	/* copy return values back */		\
 	MOVL	argptr+4(FP), DI;		\

src/pkg/runtime/asm_amd64.s

@@ -321,8 +321,22 @@ TEXT reflect·call(SB), NOSPLIT, $0-24
 	MOVQ	$runtime·badreflectcall(SB), AX
 	JMP	AX
 
+// Argument map for the callXX frames.  Each has one
+// stack map (for the single call) with 3 arguments.
+DATA gcargs_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gcargs_reflectcall<>+0x04(SB)/4, $6  // 3 args
+DATA gcargs_reflectcall<>+0x08(SB)/4, $(const_BitsPointer+(const_BitsPointer<<2)+(const_BitsScalar<<4))
+GLOBL gcargs_reflectcall<>(SB),RODATA,$12
+
+// callXX frames have no locals
+DATA gclocals_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gclocals_reflectcall<>+0x04(SB)/4, $0  // 0 locals
+GLOBL gclocals_reflectcall<>(SB),RODATA,$8
+
 #define CALLFN(NAME,MAXSIZE)			\
 TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-24;	\
+	FUNCDATA $FUNCDATA_ArgsPointerMaps,gcargs_reflectcall<>(SB);	\
+	FUNCDATA $FUNCDATA_LocalsPointerMaps,gclocals_reflectcall<>(SB);\
 	/* copy arguments to stack */		\
 	MOVQ	argptr+8(FP), SI;		\
 	MOVLQZX argsize+16(FP), CX;		\
@@ -330,6 +344,7 @@ TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-24;	\
 	REP;MOVSB;				\
 	/* call function */			\
 	MOVQ	f+0(FP), DX;			\
+	PCDATA  $PCDATA_StackMapIndex, $0;	\
 	CALL	(DX);				\
 	/* copy return values back */		\
 	MOVQ	argptr+8(FP), DI;		\

src/pkg/runtime/asm_arm.s

@@ -301,8 +301,22 @@ TEXT reflect·call(SB), NOSPLIT, $-4-16
 	MOVW	$runtime·badreflectcall(SB), R1
 	B	(R1)
 
+// Argument map for the callXX frames.  Each has one
+// stack map (for the single call) with 3 arguments.
+DATA gcargs_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gcargs_reflectcall<>+0x04(SB)/4, $6  // 3 args
+DATA gcargs_reflectcall<>+0x08(SB)/4, $(const_BitsPointer+(const_BitsPointer<<2)+(const_BitsScalar<<4))
+GLOBL gcargs_reflectcall<>(SB),RODATA,$12
+
+// callXX frames have no locals
+DATA gclocals_reflectcall<>+0x00(SB)/4, $1  // 1 stackmap
+DATA gclocals_reflectcall<>+0x04(SB)/4, $0  // 0 locals
+GLOBL gclocals_reflectcall<>(SB),RODATA,$8
+
 #define CALLFN(NAME,MAXSIZE)			\
 TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-16;	\
+	FUNCDATA $FUNCDATA_ArgsPointerMaps,gcargs_reflectcall<>(SB);	\
+	FUNCDATA $FUNCDATA_LocalsPointerMaps,gclocals_reflectcall<>(SB);\
 	/* copy arguments to stack */		\
 	MOVW	argptr+4(FP), R0;		\
 	MOVW	argsize+8(FP), R2;		\
@@ -316,6 +330,7 @@ TEXT runtime·NAME(SB), WRAPPER, $MAXSIZE-16;	\
 	/* call function */			\
 	MOVW	f+0(FP), R7;			\
 	MOVW	(R7), R0;			\
+	PCDATA  $PCDATA_StackMapIndex, $0;	\
 	BL	(R0);				\
 	/* copy return values back */		\
 	MOVW	argptr+4(FP), R0;		\