套餐
runtime是你的朋友：
func trace() {
pc := make([]uintptr,10) // at least 1 entry needed
runtime.Callers(2,pc)
f := runtime.FuncForPC(pc[0])
file,line := f.FileLine(pc[0])
fmt.Printf("%s:%d %s\n",file,line,f.Name())
}
