Re: NSClassSwapper leaving dangling pointers?

[Luboš Doležel]

Hi,

great! Feel free to contact me via Jabber (same as mail address), 
should you run into any issues.

Attached is the backtrace leading up to NSClassSwapper, as Germán 
requested.

Lubos

[1] https://github.com/LubosD/darling-dmg

On Sun, 23 Jun 2013 19:39:54 -0400, Gregory Casamento wrote:
> I am going to set up darling to test this. I wrote nsclassswapper. 
>
> On Saturday, June 22, 2013, Luboš Doležel wrote:
>
> > Hi,
> >
> > I'm actually not porting the code - I'm writing a Wine-like
> > emulation layer called Darling to run OS X apps directly. This fact
> > makes debugging slightly more difficult, but you're welcome to take
> > a look at http://github.com/LubosD/darling. [2]
> >
> > I find the bug straightforward, class swapping should happen
> > before action/target binding, but I may be wrong indeed.
> >
> > Germán, I'll mail a longer backtrace as soon as possible.
> >
> > Luboš
> >
> > Dne 22. června 2013 16:38:26 Eric Wasylishen napsal:
> >
> > > Hi Luboš,
> > >
> > > I'm not too familiar with nib loading internals, but I will try
> > > to take a look. Could you  upload your work in progress code
> > > somewhere? (Or do you have any changes to the original Mac
> > > source?)
> > >
> > > Cool idea to port the unarchiver. :-)
> > >
> > > Cheers,
> > > Eric
> > >
> > > On Jun 21, 2013 11:30 AM, "Luboš Doležel" wrote:
> > >
> > > > Hi,
> > > >
> > > > I'm still working on getting the latest The Unarchiver for OS
> > > > X working under GNUstep/Darling/Linux and I'm seeing crashes
> > > > after the application's NIB file is loaded.
> > > >
> > > > Now I'm sort of helpless. The crash happens when using the
> > > > target of a certain NSMenuItem.
> > > >
> > > > You can see an excerpt of the relevant NIB's source here; the
> > > > NSMenuItem clearly refers to the NSPopUpButtonCell that it is
> > > > part of:
> > > >
> > > >   -2076180416
> > > >   2048
> > > >  
> > > >  
> > > >   109199360
> > > >   1
> > > >  
> > > >  
> > > >  
> > > >    
> > > >  
> > > >   400
> > > >   75
> > > >
> > > >  
> > > >    
> > > >    dummy
> > > >    
> > > >    1048576
> > > >    2147483647
> > > >    1
> > > >    
> > > >    
> > > >    _popUpItemAction:
> > > >    
> > > >  
> > > >
> > > > (Full code can be found in The Unarchiver's source tarball in
> > > > MainMenu.nib/designable.nib)
> > > >
> > > > I can see the target being set correctly via -setTarget upon
> > > > loading:
> > > >
> > > > Breakpoint 3, -[NSMenuItem setTarget:] (self=0x1845808,
> > > > _cmd=0x7ffff7a51eb0 , anObject=0x1843d58) at NSMenuItem.m:465
> > > > 465       if (_target == anObject)
> > > > (gdb) p anObject
> > > > = (id) 0x1843d58
> > > > (gdb) p anObject->isa
> > > > = (struct objc_class *) 0x7ffff7a6bcc0
> > > >
> > > > Backtrace:
> > > >
> > > > #0  -[NSMenuItem setTarget:] (self=0x189de68,
> > > > _cmd=0x7ffff79f7ce0 , anObject=0x1429f18) at NSMenuItem.m:465
> > > > #1  0x00007ffff745354e in -[NSNibControlConnector
> > > > establishConnection] (self=0x189de38, _cmd=0x7ffff7afe330 ) at
> > > > NSBundleAdditions.m:177
> > > > #2  0x00007ffff76cfb91 in -[NSIBObjectData
> > > > nibInstantiateWithOwner:topLevelObjects:] (self=0x14be778,
> > > > _cmd=0x7ffff7afdf70 , owner=0xe67488,
> > > >     topLevelObjects=0x0) at GSNibLoading.m:1926
> > > > #3  0x00007ffff76cff26 in -[NSIBObjectData awakeWithContext:]
> > > > (self=0x14be778, _cmd=0x7ffff7b1a170 , context=0xcb09f8) at
> > > > GSNibLoading.m:1982
> > > > #4  0x00007ffff771028e in -[GSNibLoader
> > > > loadModelData:externalNameTable:withZone:] (self=0xde8158,
> > > > _cmd=0x7ffff7a56260 , data=0xeffb58, context=0xcb09f8,
> > > >     zone=0x329060bb38 ) at GSNibLoader.m:87
> > > > #5  0x00007ffff753f57d in -[NSNib
> > > > instantiateNibWithExternalNameTable:withZone:] (self=0xecf938,
> > > > _cmd=0x7ffff79f7b00 , externalNameTable=0xcb09f8,
> > > >     zone=0x329060bb38 ) at NSNib.m:153
> > > > #6  0x000
>
> --
> Gregory Casamento
> Open Logic Corporation, Principal Consultant
> yahoo/skype: greg_casamento, aol: gjcasa
> (240)274-9630 (Cell)
> http://www.gnustep.org [3]
>  http://heronsperch.blogspot.com [4]
>
>
> Links:
> ------
> [1] http://wakaba.c3.cx/s/apps/unarchiver.html
> [2] http://github.com/LubosD/darling.
> [3] http://www.gnustep.org
> [4] http://heronsperch.blogspot.com

--
Luboš Doležel

swapper-bt.txt
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