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// 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"}