Exceptions on iOS3.2 and higher not being caught?

Subject: Exceptions on iOS3.2 and higher not being caught?
From: Dave MacLachlan <email@hidden>
Date: Fri, 2 Jul 2010 09:00:14 -0700
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I realize this may be a little off topic for the list, but it's right on the fuzzy edge of the ObjC language vs the Foundation framework, and I was hoping our local runtime wrangler expert may have an idea for me:

It appears that exceptions on iOS3.2+ can't be thrown across NSInvocations. This only seemed to start happening with the iOS3.2 release. @try {

NSInvocation invocation = [self getAninvocationThatThrowsAnException];

[invocation invokeWithTarget:self]; }

@catch (NSException e) {

 NSLog(@"%@", e);

Doesn't get caught, but

@try {

NSInvocation invocation = [self getAninvocationThatThrowsAnException];

objc_msgSend(self, [invocation selector]); }

@catch (NSException e) {

NSLog(@"%@", e);

does. This causes a lot of problems for testing frameworks (GoogleToolbox, OCMock, Hamcrest and most like SenTestingKit) on iOS as they all depend on throwing exceptions across NSInvocations to propagate error conditions.

Is this intentional, or a bug? I would think it is a bug, except I would expect that anyone using any test driven development would've run into it pretty much immediately. We had seen it internally, but I hadn't had time to look at the cause until now.

Radar 8081169 if that helps. (http://openradar.appspot.com/8081169)

Cheers,

Dave
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