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Diffstat (limited to 'src/reflect/asm_amd64.s')
| -rw-r--r-- | src/reflect/asm_amd64.s | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/reflect/asm_amd64.s b/src/reflect/asm_amd64.s new file mode 100644 index 0000000..facf075 --- /dev/null +++ b/src/reflect/asm_amd64.s @@ -0,0 +1,83 @@ +// Copyright 2012 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. + +#include "textflag.h" +#include "funcdata.h" +#include "go_asm.h" + +// The frames of each of the two functions below contain two locals, at offsets +// that are known to the runtime. +// +// The first local is a bool called retValid with a whole pointer-word reserved +// for it on the stack. The purpose of this word is so that the runtime knows +// whether the stack-allocated return space contains valid values for stack +// scanning. +// +// The second local is an abi.RegArgs value whose offset is also known to the +// runtime, so that a stack map for it can be constructed, since it contains +// pointers visible to the GC. +#define LOCAL_RETVALID 32 +#define LOCAL_REGARGS 40 + +// makeFuncStub is the code half of the function returned by MakeFunc. +// See the comment on the declaration of makeFuncStub in makefunc.go +// for more details. +// No arg size here; runtime pulls arg map out of the func value. +// makeFuncStub must be ABIInternal because it is placed directly +// in function values. +// This frame contains two locals. See the comment above LOCAL_RETVALID. +TEXT ·makeFuncStub<ABIInternal>(SB),(NOSPLIT|WRAPPER),$312 + NO_LOCAL_POINTERS + // NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this + // frame is specially handled in the runtime. See the comment above LOCAL_RETVALID. + LEAQ LOCAL_REGARGS(SP), R12 + CALL runtime·spillArgs<ABIInternal>(SB) + MOVQ DX, 24(SP) // outside of moveMakeFuncArgPtrs's arg area + MOVQ DX, 0(SP) + MOVQ R12, 8(SP) + CALL ·moveMakeFuncArgPtrs(SB) + MOVQ 24(SP), DX + MOVQ DX, 0(SP) + LEAQ argframe+0(FP), CX + MOVQ CX, 8(SP) + MOVB $0, LOCAL_RETVALID(SP) + LEAQ LOCAL_RETVALID(SP), AX + MOVQ AX, 16(SP) + LEAQ LOCAL_REGARGS(SP), AX + MOVQ AX, 24(SP) + CALL ·callReflect(SB) + LEAQ LOCAL_REGARGS(SP), R12 + CALL runtime·unspillArgs<ABIInternal>(SB) + RET + +// methodValueCall is the code half of the function returned by makeMethodValue. +// See the comment on the declaration of methodValueCall in makefunc.go +// for more details. +// No arg size here; runtime pulls arg map out of the func value. +// methodValueCall must be ABIInternal because it is placed directly +// in function values. +// This frame contains two locals. See the comment above LOCAL_RETVALID. +TEXT ·methodValueCall<ABIInternal>(SB),(NOSPLIT|WRAPPER),$312 + NO_LOCAL_POINTERS + // NO_LOCAL_POINTERS is a lie. The stack map for the two locals in this + // frame is specially handled in the runtime. See the comment above LOCAL_RETVALID. + LEAQ LOCAL_REGARGS(SP), R12 + CALL runtime·spillArgs<ABIInternal>(SB) + MOVQ DX, 24(SP) // outside of moveMakeFuncArgPtrs's arg area + MOVQ DX, 0(SP) + MOVQ R12, 8(SP) + CALL ·moveMakeFuncArgPtrs(SB) + MOVQ 24(SP), DX + MOVQ DX, 0(SP) + LEAQ argframe+0(FP), CX + MOVQ CX, 8(SP) + MOVB $0, LOCAL_RETVALID(SP) + LEAQ LOCAL_RETVALID(SP), AX + MOVQ AX, 16(SP) + LEAQ LOCAL_REGARGS(SP), AX + MOVQ AX, 24(SP) + CALL ·callMethod(SB) + LEAQ LOCAL_REGARGS(SP), R12 + CALL runtime·unspillArgs<ABIInternal>(SB) + RET |