blob: 672782576b6cb624ee22e505f6c6134581b2b817 [file] [log] [blame]
// 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.
//go:build go1.5
package driver
import (
"flag"
"fmt"
"os"
"runtime/trace"
)
var traceFile = flag.String("trace", "", "write an execution trace to the named file after execution")
func startTraceGo15() func() {
// New runtime tracing added in Go 1.5.
if *traceFile != "" {
f, err := os.Create(*traceFile)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
if err := trace.Start(f); err != nil {
fmt.Fprintf(os.Stderr, "can't start tracing: %s\n", err)
os.Exit(1)
}
return func() {
trace.Stop()
f.Close()
}
}
return func() {}
}
func init() {
startTrace = startTraceGo15
}