The famous TN2124
(http://developer.apple.com/technotes/tn2004/tn2124.html) has this to
say about debugging using zombies:
"You can use GDB to set a breakpoint on -[_NSZombie
methodSignatureForSelector:] to further debug this sort of problem."
However this does not appear to work. GDB cannot resolve this
breakpoint, and indeed the _NSZombie class no longer appears to exist
on 10.5.5 (and presumably all of 10.5). This test program illustrates:
#import <Foundation/Foundation.h>
int main( int argc, char **argv )
{
[NSAutoreleasePool new];
id obj = [[NSObject alloc] init];
[obj release];
NSLog(@"Class of released object is %@, _NSZombie is %@",
NSStringFromClass(obj->isa), NSClassFromString(@"_NSZombie"));
return 0;
}
This is the output I get on my machine when the above is run with
NSZombieEnabled=YES:
2008-10-30 12:54:42.810 a.out[28706:10b] Class of released object is
_NSZombie_NSObject, _NSZombie is (null)
So it would appear that NSZombieEnabled has gone to creating dynamic
zombie classes rather than simply using a single _NSZombie class as in
days past. Which is fine. Except that I no longer know where to set my
breakpoint. Am I doing something wrong, or what's the substitute for
-[_NSZombie methodSignatureForSelector:]?
Mike
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