RESOLVED WONTFIX Bug 18234
JS exception thrown from NPN_InvokeDefault not shown in error console. 
https://bugs.webkit.org/show_bug.cgi?id=18234
Summary JS exception thrown from NPN_InvokeDefault not shown in error console.
Jeremy Moskovich
Reported 2008-03-31 01:57:53 PDT
Invoking the following JS code from an NPAPI plug-in via the NPN_InvokeDefault() function doesn't show the exception in the error console: function() { throw "An Exception"; } Stepping into _NPN_InvokeDefault() in NP_jsobject.cpp shows that the exception appears to have been set correctly in the ExecState but this apparently isn't bubbled up when the plugin code returns control to the browser.
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Alexey Proskuryakov
Comment 1 2008-03-31 22:58:26 PDT
See also: bug 17470.
Eric Seidel (no email)
Comment 2 2008-04-01 12:16:55 PDT
This bug blocks Google Gears support in Safari.
Eric Seidel (no email)
Comment 3 2008-04-08 02:05:25 PDT
Working on a real fix as we speak.
Eric Seidel (no email)
Comment 4 2008-04-16 07:47:56 PDT
Updating the bug, finally. This is very much tied to the NPN_SetException bug. The fix is to save off the current ExecState in a static (or per-thread) static, and then throw the exception in that ExecState. I tried saving the ExecState on the Instance, however that doesn't work for Obj-C (since it's a static method), and doesn't work well for JS/C++ either since you have to be thrown an JavaScriptObject in order to be able to get back to an Instance. I may find time to finish up my patch, but right now real work is distracting...
David Kilzer (:ddkilzer)
Comment 5 2008-07-20 10:41:54 PDT
<rdar://problem/6089187>
David Kilzer (:ddkilzer)
Comment 6 2008-07-20 15:26:10 PDT
Related to Bug 19936?
Eric Seidel (no email)
Comment 7 2011-05-17 10:48:38 PDT
This is stll likely a bug, but Gears no longer cares since Gears is dead.
Alexey Proskuryakov
Comment 8 2022-06-20 17:03:45 PDT
NPAPI is gone.
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