lua如何获取方法调用层级

最近在做精准测试分析，请问lua如何获取方法调用层级。。。。？

http://blog.csdn.net/xiaozhi0999/article/details/47009927

http://blog.csdn.net/u012071200/article/details/59530595 你说的“层级”应该是调用堆栈

http://blog.csdn.net/xiaozhi0999/article/details/47009927