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 80