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// Copyright 2015 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 gc
import (
"os"
"runtime"
"runtime/pprof"
)
// Line returns n's position as a string. If n has been inlined,
// it uses the outermost position where n has been inlined.
func (n *Node) Line() string {
return linestr(n.Pos)
}
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)
}
var (
blockprofile string
cpuprofile string
memprofile string
memprofilerate int64
traceprofile string
traceHandler func(string)
mutexprofile string
)
func startProfile() {
if cpuprofile != "" {
f, err := os.Create(cpuprofile)
if err != nil {
Fatalf("%v", err)
}
if err := pprof.StartCPUProfile(f); err != nil {
Fatalf("%v", err)
}
atExit(pprof.StopCPUProfile)
}
if memprofile != "" {
if memprofilerate != 0 {
runtime.MemProfileRate = int(memprofilerate)
}
f, err := os.Create(memprofile)
if err != nil {
Fatalf("%v", err)
}
atExit(func() {
// Profile all outstanding allocations.
runtime.GC()
// compilebench parses the memory profile to extract memstats,
// which are only written in the legacy pprof format.
// See golang.org/issue/18641 and runtime/pprof/pprof.go:writeHeap.
const writeLegacyFormat = 1
if err := pprof.Lookup("heap").WriteTo(f, writeLegacyFormat); err != nil {
Fatalf("%v", err)
}
})
} else {
// Not doing memory profiling; disable it entirely.
runtime.MemProfileRate = 0
}
if blockprofile != "" {
f, err := os.Create(blockprofile)
if err != nil {
Fatalf("%v", err)
}
runtime.SetBlockProfileRate(1)
atExit(func() {
pprof.Lookup("block").WriteTo(f, 0)
f.Close()
})
}
if mutexprofile != "" {
f, err := os.Create(mutexprofile)
if err != nil {
Fatalf("%v", err)
}
startMutexProfiling()
atExit(func() {
pprof.Lookup("mutex").WriteTo(f, 0)
f.Close()
})
}
if traceprofile != "" && traceHandler != nil {
traceHandler(traceprofile)
}
}
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