API to get stack frame info from generator
bruant.d at gmail.com
Fri Jun 14 12:54:00 PDT 2013
Le 14/06/2013 16:56, Bruno Jouhier a écrit :
> I'm using ES6 generators to implement a little async/await library and
> I'm quite pleased with the result so far but I'm lacking one API: a
> function to get stack information from a generator object. Ideally it
> would return the name of the current generator function, the filename
> and the line number where it last yielded.
> If I had this API I 'd be able to provide a complete trace of the
> stack of await calls when an exception is caught.
ES5 strict mode poisoned .caller and .callee. The reason is that it
isn't necessarily a good idea (security, maybe performance reasons as
well) to give authority to the runtime to inspect stack frames. It's
more of a debugger use case.
The Debugger API in Firefox (only available to "Chrome-level" privileged
code) has a way to know the function being called, and to navigate
across the different frames like the caller frame ("older" property) 
and some infos that help finding the function name, filename and line
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