File, Function name and line information for debugging call sites

main.go

package main

import (
	"fmt"
	"runtime"
)

func debugPrintf(fmt_ string, args ...interface{}) {
	programCounter, file, line, _ := runtime.Caller(1)
	fn := runtime.FuncForPC(programCounter)
	prefix := fmt.Sprintf("[%s:%s %d] %s", file, fn.Name(), line, fmt_)
	fmt.Printf(prefix, args...)
	fmt.Println()
}

func foo() {
	debugPrintf("calling here")
}

func foo2() {
	debugPrintf("called here")
	foo()
}

func main() {
	foo2()
}