433618 - JS_GetPendingException doesn't return objects other than Error

Status: RESOLVED INCOMPLETE

(Core :: JavaScript Engine, defect)

Description

[(dormant account)]

Attachment: shows JS_GetPendingException

I was trying to throw custom objects instead of Error objects and noticed that JS_GetPendingException doesn't return those.
Here is a session in a slightly modified js shell.
js> throw new Error()
JS_GetPendingException: 1
typein:1:
js> throw new Object()
JS_GetPendingException: 0
uncaught exception: [object Object]
js>
 
shaver says this might be a bad bug.

Comment 1

[Mike Shaver (:shaver -- probably not reading bugmail closely)]

We explicitly clear the exception before calling the error reporter for uncaught exceptions, I suspect in case the reporter calls script:

http://lxr.mozilla.org/mozilla/source/js/src/jsexn.c#1293

Set JSOPTION_DONT_REPORT_UNCAUGHT on the context if you don't want the conversion to error.

(Whew!)

Comment 2

[Mike Shaver (:shaver -- probably not reading bugmail closely)]

Or not.  We should SetPending/ClearPending around both flavours of error-reporter calling.