golang base 代码
文件路径：/src/cmd/compile/internal/base/base.go
/ Copyright 2009 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 base
import (
"os"
)
var atExitFuncs []func()
func AtExit(f func()) {
atExitFuncs = append(atExitFuncs, f)
}
func Exit(code int) {
for i := len(atExitFuncs) - 1; i >= 0; i-- {
f := atExitFuncs[i]
atExitFuncs = atExitFuncs[:i]
f()
}
os.Exit(code)
}
/ To enable tracing support (-t flag), set EnableTrace to true.
const EnableTrace = false
func Compiling(pkgs []string) bool {
if Ctxt.Pkgpath != "" {
for _, p := range pkgs {
if Ctxt.Pkgpath == p {
return true
}
}
}
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{
"runtime/internal/atomic",
"runtime/internal/math",
"runtime/internal/sys",
"runtime/internal/syscall",
"runtime",
"runtime/race",
"runtime/msan",
"runtime/asan",
"internal/cpu",
}
/ Don't insert racefuncenter/racefuncexit into the following packages.
/ Memory accesses in the packages are either uninteresting or will cause false positives.
var NoRacePkgs = []string{"sync", "sync/atomic"}