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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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2
src/cmd/compile/internal/ssa/gen/AMD64Ops.go
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@ -556,6 +556,8 @@ func init() {
// the result should be the PC within f that g will return to.
// See runtime/stubs.go for a more detailed discussion.
{name: "LoweredGetCallerPC", reg: gp01},
// LoweredGetCallerSP returns the SP of the caller of the current function.
{name: "LoweredGetCallerSP", reg: gp01, rematerializeable: true},
//arg0=ptr,arg1=mem, returns void. Faults if ptr is nil.
{name: "LoweredNilCheck", argLength: 2, reg: regInfo{inputs: []regMask{gpsp}}, clobberFlags: true, nilCheck: true, faultOnNilArg0: true},