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Retain/Release vs. bindings: Who binds to me?

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Retain/Release vs. bindings: Who binds to me?

Subject: Retain/Release vs. bindings: Who binds to me?
From: Pierre Bernard <email@hidden>
Date: Sat, 17 Feb 2007 15:36:42 +0100

Hi!

I am having a bug with too early deallocation.

I have a window controller which I lazily instantiate in my NSDocument subclass. That controller loads a nib and a few other controllers along with their views. Later I release the controller in my Document dealloc method.

But then I get a crasher as something still tries to touch my controller. From the stack trace below I appears that some binding is causing this as it is undone.

#0 0x926da940 in -[_NSZombie methodSignatureForSelector:] #1 0x925fe380 in -[NSObject(NSForwardInvocation) forward::] #2 0x90a59cc1 in _objc_msgForward #3 0x926c456c in _NSKeyValueObservationInfoGetForwarderForObserver #4 0x9269c74b in -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] #5 0x93521f02 in -[NSController removeObserver:forKeyPath:] #6 0x934fd04a in -[NSBinder _updateObservingRegistration:] #7 0x93521b92 in -[NSBinder breakConnection] #8 0x9338d694 in +[_NSBindingAdaptor returnDisconnectedBindingsOfObject:] #9 0x9338d592 in -[NSTableColumn setTableView:] #10 0x925f4059 in -[NSArray makeObjectsPerformSelector:withObject:] #11 0x93395079 in -[NSTableView dealloc] #12 0x93495081 in -[NSOutlineView dealloc] #13 0x9328ba67 in -[NSView release] #14 0x925dca0f in NSPopAutoreleasePool #15 0x93278e28 in -[NSApplication run] #16 0x9326cd2f in NSApplicationMain #17 0x000f1ffc in main at main.m:13

How can I figure out who binds to my controller so I can maybe unbind before deallocating?

Is there a standard way of debugging such memory management issues?

Thanks in advance,
Pierre


---
Pierre Bernard
http://www.bernard-web.com/pierre
http://www.houdah.com

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