How do you check a memory allocation by address in the XCode debugger?

I am trying to debug some stuff and while I'll also RTFM can anyone tell me how to check the allocation of a memory address in XCode? The text I automatically jump to on the error is not immediately decipherable. In an ideal world I'd开发者_运维技巧 like to figure out the name of the variable (or at least its contents) that I just re-released.

An example of the error I'm trying to hunt down is:

2010-08-22 10:18:51.111 AppName[106:307] *** -[CFString release]: message sent to deallocated instance 0x19f3b0

A screenshot would be lovely.

The allocation's address -- in this case, 0x19f3b0 -- may be stored in any number of variables.

What you need to figure out is exactly which release or autorelease was one too many.

To do that, use the Zombie detection template in Instruments. Screenshots in a second.