}

func traceSpanTypeAndClass(s *mspan) traceArg {
	if s.state.get() == mSpanInUse {
		return traceArg(s.spanclass) << 1
	}
	return traceArg(1)
}

// SpanExists records an event indicating that the span exists.
func (tl traceLocker) SpanExists(s *mspan) {
	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpan, traceSpanID(s), traceArg(s.npages), traceSpanTypeAndClass(s))
}