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cmd/compile: intrinsify runtime.getcallersp

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Add a compiler intrinsic for getcallersp. So we are able to get
rid of the argument (not done in this CL).

Change-Id: Ic38fda1c694f918328659ab44654198fb116668d
Reviewed-on: https://go-review.googlesource.com/69350
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2017-10-09 15:33:29 -04:00
parent ae175f74cb
commit 6f3e5e637c
37 changed files with 296 additions and 11 deletions
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9
src/cmd/compile/internal/x86/ssa.go
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@ -675,6 +675,15 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.Op386LoweredGetCallerSP:
// caller's SP is the address of the first arg
p := s.Prog(x86.AMOVL)
p.From.Type = obj.TYPE_ADDR
p.From.Offset = -gc.Ctxt.FixedFrameSize() // 0 on 386, just to be consistent with other architectures
p.From.Name = obj.NAME_PARAM
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.Op386CALLstatic, ssa.Op386CALLclosure, ssa.Op386CALLinter:
s.Call(v)
case ssa.Op386NEGL,