On 22 Jan 2012, at 18:45, Jens Alfke wrote:
>
> On Jan 22, 2012, at 5:15 AM, Thomas Davie wrote:
>
>> As you can see, none of that is in my code (beyond main), so I have a real
>> problem debugging what's going on here.
>
> Cocoa debugging tip: A crash in objc_msgsend almost always implies a dangling
> reference to a deallocated object. Usually the dead object is being messaged
> directly, or sometimes a still-active instance method has accessed one of its
> instance variables that got overwritten with garbage.
>
> The best response is to go into the scheme editor and turn on zombies and
> scribbling. Zombies will give you much more detailed information if a dead
> object is messaged, and scribbling will immediately overwrite freed memory
> with a 0x55 pattern that’s easily detectable in crashes (if the crash is
> trying to read memory from address 0x55555555, you can be pretty sure why.)
Thanks Jens,
I received the same advice from #iphonedev on freenode earlier today, and
eventually tracked it down to an object being deallocated that was still
pointed at as a delegate.
Cheers for your help :)
if (*ra4 != 0xffc78948) { return false; }
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