Method stackTrace

state.go:795–822

(level int)

}

func (ls *LState) stackTrace(level int) string {
	buf := []string{}
	header := "stack traceback:"
	if ls.currentFrame != nil {
		i := 0
		for dbg, ok := ls.GetStack(i); ok; dbg, ok = ls.GetStack(i) {
			cf := dbg.frame
			buf = append(buf, fmt.Sprintf("\t%v in %v", ls.Where(i), ls.formattedFrameFuncName(cf)))
			if !cf.Fn.IsG && cf.TailCall > 0 {
				for tc := cf.TailCall; tc > 0; tc-- {
					buf = append(buf, "\t(tailcall): ?")
					i++
				}
			}
			i++
		}
	}
	buf = append(buf, fmt.Sprintf("\t%v: %v", "[G]", "?"))
	buf = buf[intMax(0, intMin(level, len(buf))):len(buf)]
	if len(buf) > 20 {
		newbuf := make([]string, 0, 20)
		newbuf = append(newbuf, buf[0:7]...)
		newbuf = append(newbuf, "\t...")
		newbuf = append(newbuf, buf[len(buf)-7:len(buf)]...)
		buf = newbuf
	}
	return fmt.Sprintf("%s\n%s", header, strings.Join(buf, "\n"))
}

func (ls *LState) formattedFrameFuncName(fr *callFrame) string {
	name, ischunk := ls.frameFuncName(fr)