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) [1]
and some infos that help finding the function name, filename and line
number.
David
[1]
https://developer.mozilla.org/en-US/docs/SpiderMonkey/JS_Debugger_API_Reference/Debugger.Frame
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