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cmd/compile: move racewalk comment to walk/race.go

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This comment got left behind in some refactoring and now refers to
code "below" that is no longer below. Move it to be with the code it's
referring to.

Change-Id: I7f7bf0cf8b22c1f6e05ff12b8be71d18fb3359d5
Reviewed-on: https://go-review.googlesource.com/c/go/+/521177
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Austin Clements <austin@google.com>
TryBot-Bypass: Austin Clements <austin@google.com>
This commit is contained in:
Austin Clements 2023-07-07 17:06:23 -04:00 committed by Gopher Robot
parent 01cad815a1
commit e7a1eb066b
2 changed files with 20 additions and 20 deletions
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20
src/cmd/compile/internal/base/base.go
View File

@ -232,26 +232,6 @@ func Compiling(pkgs []string) bool {
return false
}
// The racewalk pass is currently handled in three parts.
//
// First, for flag_race, it inserts calls to racefuncenter and
// racefuncexit at the start and end (respectively) of each
// function. This is handled below.
//
// Second, during buildssa, it inserts appropriate instrumentation
// calls immediately before each memory load or store. This is handled
// by the (*state).instrument method in ssa.go, so here we just set
// the Func.InstrumentBody flag as needed. For background on why this
// is done during SSA construction rather than a separate SSA pass,
// see issue #19054.
//
// Third, we remove calls to racefuncenter and racefuncexit, for leaf
// functions without instrumented operations. This is done as part of
// ssa opt pass via special rule.
// TODO(dvyukov): do not instrument initialization as writes:
// a := make([]int, 10)
// Do not instrument the following packages at all,
// at best instrumentation would cause infinite recursion.
var NoInstrumentPkgs = []string{

20
src/cmd/compile/internal/walk/race.go
View File

@ -11,6 +11,26 @@ import (
"cmd/internal/src"
)
// The racewalk pass is currently handled in three parts.
//
// First, for flag_race, it inserts calls to racefuncenter and
// racefuncexit at the start and end (respectively) of each
// function. This is handled below.
//
// Second, during buildssa, it inserts appropriate instrumentation
// calls immediately before each memory load or store. This is handled
// by the (*state).instrument method in ssa.go, so here we just set
// the Func.InstrumentBody flag as needed. For background on why this
// is done during SSA construction rather than a separate SSA pass,
// see issue #19054.
//
// Third, we remove calls to racefuncenter and racefuncexit, for leaf
// functions without instrumented operations. This is done as part of
// ssa opt pass via special rule.
// TODO(dvyukov): do not instrument initialization as writes:
// a := make([]int, 10)
func instrument(fn *ir.Func) {
if fn.Pragma&ir.Norace != 0 || (fn.Linksym() != nil && fn.Linksym().ABIWrapper()) {
return