如何获取当前函数名称

Question

For tracing purpose, I'd like to print out current function name, like the __FUNCTION__ macro in gcc.

So that when I have a function

func foo () {
   trace()
}

it will automatically print out Entering foo()... or something like that.

Answer 1

[Note: Go 1.7+ recommends using runtime.CallersFrames instead of runtime.FuncForPC; another answer has an updated example].

Package runtime is your friend here:

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
", file, line, f.Name())
}