Can i make an Xcode breakpoint when a certain class gets added to autorelease pool?

Question

I'm trying to debug some ARC code, and it'd be really helpful if i could find out when an object of a certain class is added to the autorelease pool (not when it is actually autoreleased down the track).

Is this possible, eg with a breakpoint? Or by overwriting the 'autorelease' method and putting a breakpoint in it? Any suggestions?

-- edit --

The problem is that i've got an infrequent crash occurring where a custom subclass of UIView is autoreleased on a background thread, which crashes because UIView's cannot be dealloc'd on a background thread. The trace looks like below:

0    libsystem_kernel.dylib  __pthread_kill + 8
1    libsystem_c.dylib   pthread_kill + 54
2    libsystem_c.dylib   abort + 94
3    libc++abi.dylib     abort_message + 46
4    libc++abi.dylib     default_terminate() + 24
5    libobjc.A.dylib     _objc_terminate + 146
6    libc++abi.dylib     safe_handler_caller(void (*)()) + 76
7    libc++abi.dylib     operator delete(void*)
8    libc++abi.dylib     __cxa_throw + 122
9    libobjc.A.dylib     objc_exception_throw + 94
10   CoreFoundation  +[NSException raise:format:]
11   Foundation  -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 90
12   MYAPP   MySuperclass.m line 156 -[MySuperclass dealloc]
13   MYAPP  MyClass.m line 41 -[MyClass dealloc]
14 ...   libobjc.A.dylib     _objc_rootRelease + 36
15   libobjc.A.dylib     objc_release + 38
16   libobjc.A.dylib     (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 224
17   libobjc.A.dylib     _objc_autoreleasePoolPop + 12
18   CoreFoundation  _CFAutoreleasePoolPop + 18
19   libdispatch.dylib   _dispatch_worker_thread2 + 338
20   libsystem_c.dylib   _pthread_wqthread + 294

Answer 1

This might not help with your problem, but I think it answers your original question:

You can add a symbolic breakpoint on [NSObject autorelease] and then set a condition to match your class. If your running on a device $r0 should hold the pointer to the receiving object. You need to do some casting to make the condition work: (BOOL)[(id)$r0 isKindOfClass:[NSArray class]] breaks whenever an NSArray is added to the autoreleasepool. Note that everything will be running very slow as the debugger has to break on every autorelease and check the condition.