asm_amd64.s

Documentation: reflect

     1// Copyright 2012 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5#include "textflag.h"
     6#include "funcdata.h"
     7#include "go_asm.h"
     8
     9// The frames of each of the two functions below contain two locals, at offsets
    10// that are known to the runtime.
    11//
    12// The first local is a bool called retValid with a whole pointer-word reserved
    13// for it on the stack. The purpose of this word is so that the runtime knows
    14// whether the stack-allocated return space contains valid values for stack
    15// scanning.
    16//
    17// The second local is an abi.RegArgs value whose offset is also known to the
    18// runtime, so that a stack map for it can be constructed, since it contains
    19// pointers visible to the GC.
    20#define LOCAL_RETVALID 32
    21#define LOCAL_REGARGS 40
    22
    23// makeFuncStub is the code half of the function returned by MakeFunc.
    24// See the comment on the declaration of makeFuncStub in makefunc.go
    25// for more details.
    26// No arg size here; runtime pulls arg map out of the func value.
    27// This frame contains two locals. See the comment above LOCAL_RETVALID.
    28TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$312
    29	NO_LOCAL_POINTERS
    30	// NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this
    31	// frame is specially handled in the runtime. See the comment above LOCAL_RETVALID.
    32	LEAQ	LOCAL_REGARGS(SP), R12
    33	CALL	runtime·spillArgs(SB)
    34	MOVQ	DX, 24(SP) // outside of moveMakeFuncArgPtrs's arg area
    35	MOVQ	DX, 0(SP)
    36	MOVQ	R12, 8(SP)
    37	CALL	·moveMakeFuncArgPtrs(SB)
    38	MOVQ	24(SP), DX
    39	MOVQ	DX, 0(SP)
    40	LEAQ	argframe+0(FP), CX
    41	MOVQ	CX, 8(SP)
    42	MOVB	$0, LOCAL_RETVALID(SP)
    43	LEAQ	LOCAL_RETVALID(SP), AX
    44	MOVQ	AX, 16(SP)
    45	LEAQ	LOCAL_REGARGS(SP), AX
    46	MOVQ	AX, 24(SP)
    47	CALL	·callReflect(SB)
    48	LEAQ	LOCAL_REGARGS(SP), R12
    49	CALL	runtime·unspillArgs(SB)
    50	RET
    51
    52// methodValueCall is the code half of the function returned by makeMethodValue.
    53// See the comment on the declaration of methodValueCall in makefunc.go
    54// for more details.
    55// No arg size here; runtime pulls arg map out of the func value.
    56// This frame contains two locals. See the comment above LOCAL_RETVALID.
    57TEXT ·methodValueCall(SB),(NOSPLIT|WRAPPER),$312
    58	NO_LOCAL_POINTERS
    59	// NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this
    60	// frame is specially handled in the runtime. See the comment above LOCAL_RETVALID.
    61	LEAQ	LOCAL_REGARGS(SP), R12
    62	CALL	runtime·spillArgs(SB)
    63	MOVQ	DX, 24(SP) // outside of moveMakeFuncArgPtrs's arg area
    64	MOVQ	DX, 0(SP)
    65	MOVQ	R12, 8(SP)
    66	CALL	·moveMakeFuncArgPtrs(SB)
    67	MOVQ	24(SP), DX
    68	MOVQ	DX, 0(SP)
    69	LEAQ	argframe+0(FP), CX
    70	MOVQ	CX, 8(SP)
    71	MOVB	$0, LOCAL_RETVALID(SP)
    72	LEAQ	LOCAL_RETVALID(SP), AX
    73	MOVQ	AX, 16(SP)
    74	LEAQ	LOCAL_REGARGS(SP), AX
    75	MOVQ	AX, 24(SP)
    76	CALL	·callMethod(SB)
    77	LEAQ	LOCAL_REGARGS(SP), R12
    78	CALL	runtime·unspillArgs(SB)
    79	RET
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