| // Copyright 2019 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" | |
| // 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 40 | |
| #define LOCAL_REGARGS 48 | |
| // The frame size of the functions below is | |
| // 32 (args of callReflect/callMethod) + (8 bool with padding) + 392 (abi.RegArgs) = 432. | |
| // 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. | |
| TEXT 路makeFuncStub(SB),(NOSPLIT|WRAPPER),$432 | |
| NO_LOCAL_POINTERS | |
| ADD $LOCAL_REGARGS, SP, X25 // spillArgs using X25 | |
| CALL runtime路spillArgs(SB) | |
| MOV CTXT, 32(SP) // save CTXT > args of moveMakeFuncArgPtrs < LOCAL_REGARGS | |
| MOV CTXT, 8(SP) | |
| MOV X25, 16(SP) | |
| CALL 路moveMakeFuncArgPtrs(SB) | |
| MOV 32(SP), CTXT // restore CTXT | |
| MOV CTXT, 8(SP) | |
| MOV $argframe+0(FP), T0 | |
| MOV T0, 16(SP) | |
| MOV ZERO, LOCAL_RETVALID(SP) | |
| ADD $LOCAL_RETVALID, SP, T1 | |
| MOV T1, 24(SP) | |
| ADD $LOCAL_REGARGS, SP, T1 | |
| MOV T1, 32(SP) | |
| CALL 路callReflect(SB) | |
| ADD $LOCAL_REGARGS, SP, X25 // unspillArgs using X25 | |
| CALL runtime路unspillArgs(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. | |
| TEXT 路methodValueCall(SB),(NOSPLIT|WRAPPER),$432 | |
| NO_LOCAL_POINTERS | |
| ADD $LOCAL_REGARGS, SP, X25 // spillArgs using X25 | |
| CALL runtime路spillArgs(SB) | |
| MOV CTXT, 32(SP) // save CTXT | |
| MOV CTXT, 8(SP) | |
| MOV X25, 16(SP) | |
| CALL 路moveMakeFuncArgPtrs(SB) | |
| MOV 32(SP), CTXT // restore CTXT | |
| MOV CTXT, 8(SP) | |
| MOV $argframe+0(FP), T0 | |
| MOV T0, 16(SP) | |
| MOV ZERO, LOCAL_RETVALID(SP) | |
| ADD $LOCAL_RETVALID, SP, T1 | |
| MOV T1, 24(SP) | |
| ADD $LOCAL_REGARGS, SP, T1 | |
| MOV T1, 32(SP) // frame size to 32+SP as callreflect args | |
| CALL 路callMethod(SB) | |
| ADD $LOCAL_REGARGS, SP, X25 // unspillArgs using X25 | |
| CALL runtime路unspillArgs(SB) | |
| RET | |