Function backtrace

Generates a backtrace for the given thread's context.

If you call this from Interceptor's onEnter or onLeave callbacks you should provide this.context for the optional context argument, as it will give you a more accurate backtrace. Omitting context means the backtrace will be generated from the current stack location, which may not give you a very good backtrace due to the JavaScript VM's potentially JITed stack frames.