// call-stack.go
package golang

import (
	"runtime"
)

func Trace(upStack int) (source string, line int, function string) {
	pc := make([]uintptr, 15)
	n := runtime.Callers(upStack, pc)
	frames := runtime.CallersFrames(pc[:n])
	frame, _ := frames.Next()
	source = frame.File
	line = frame.Line
	function = frame.Function
	// fmt.Printf("%s:%d %s\n", frame.File, frame.Line, frame.Function)
	return
}