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// 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.
package walk
import (
"cmd/compile/internal/base"
"cmd/compile/internal/ir"
"cmd/compile/internal/ssagen"
"cmd/compile/internal/typecheck"
"cmd/compile/internal/types"
"cmd/internal/src"
"cmd/internal/sys"
)
func instrument(fn *ir.Func) {
if fn.Pragma&ir.Norace != 0 || (fn.Linksym() != nil && fn.Linksym().ABIWrapper()) {
return
}
if !base.Flag.Race || !base.Compiling(base.NoRacePkgs) {
fn.SetInstrumentBody(true)
}
if base.Flag.Race {
lno := base.Pos
base.Pos = src.NoXPos
if ssagen.Arch.LinkArch.Arch.Family != sys.AMD64 {
fn.Enter.Prepend(mkcall("racefuncenterfp", nil, nil))
fn.Exit.Append(mkcall("racefuncexit", nil, nil))
} else {
// nodpc is the PC of the caller as extracted by
// getcallerpc. We use -widthptr(FP) for x86.
// This only works for amd64. This will not
// work on arm or others that might support
// race in the future.
nodpc := ir.NewNameAt(src.NoXPos, typecheck.Lookup(".fp"))
nodpc.Class_ = ir.PPARAM
nodpc.SetUsed(true)
nodpc.SetType(types.Types[types.TUINTPTR])
nodpc.SetFrameOffset(int64(-types.PtrSize))
fn.Dcl = append(fn.Dcl, nodpc)
fn.Enter.Prepend(mkcall("racefuncenter", nil, nil, nodpc))
fn.Exit.Append(mkcall("racefuncexit", nil, nil))
}
base.Pos = lno
}
}
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