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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.
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" < address@hidden> wrote:
Hi,
I'm still working on getting the latest The Unarchiver for OS X <http://wakaba.c3.cx/s/apps/unarchiver.html>
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:
<object class="NSPopUpButtonCell" key="NSCell"
id="824605593">
<int key="NSCellFlags">-2076180416</int>
<int key="NSCellFlags2">2048</int>
<reference key="NSSupport" ref="170887875"/>
<reference key="NSControlView"
ref="790450297"/>
<int key="NSButtonFlags">109199360</int>
<int key="NSButtonFlags2">1</int>
<reference key="NSAlternateImage"
ref="538669737"/>
<string key="NSAlternateContents"/>
<object class="NSMutableString"
key="NSKeyEquivalent">
<characters key="NS.bytes"/>
</object>
<int key="NSPeriodicDelay">400</int>
<int key="NSPeriodicInterval">75</int>
<object class="NSMenuItem" key="NSMenuItem"
id="444300673">
<reference key="NSMenu" ref="552121880"/>
<string key="NSTitle">dummy</string>
<string key="NSKeyEquiv"/>
<int key="NSKeyEquivModMask">1048576</int>
<int key="NSMnemonicLoc">2147483647</int>
<int key="NSState">1</int>
<reference key="NSOnImage" ref="1019969751"/>
<reference key="NSMixedImage" ref="16787521"/>
<string
key="NSAction">_popUpItemAction:</string>
<reference key="NSTarget" ref="824605593"/>
</object>
(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
<.objc_selector_list+176>, anObject=0x1843d58) at NSMenuItem.m:465
465 if (_target == anObject)
(gdb) p anObject
$15 = (id) 0x1843d58
(gdb) p anObject->isa
$16 = (struct objc_class *) 0x7ffff7a6bcc0
<_OBJC_CLASS_NSPopUpButtonCell>
Backtrace:
#0 -[NSMenuItem setTarget:] (self=0x189de68, _cmd=0x7ffff79f7ce0
<.objc_selector_list+640>, anObject=0x1429f18) at NSMenuItem.m:465
#1 0x00007ffff745354e in -[NSNibControlConnector establishConnection]
(self=0x189de38, _cmd=0x7ffff7afe330 <.objc_selector_list+1232>) at
NSBundleAdditions.m:177
#2 0x00007ffff76cfb91 in -[NSIBObjectData
nibInstantiateWithOwner:topLevelObjects:] (self=0x14be778,
_cmd=0x7ffff7afdf70 <.objc_selector_list+272>, owner=0xe67488,
topLevelObjects=0x0) at GSNibLoading.m:1926
#3 0x00007ffff76cff26 in -[NSIBObjectData awakeWithContext:]
(self=0x14be778, _cmd=0x7ffff7b1a170 <.objc_selector_list+176>,
context=0xcb09f8) at GSNibLoading.m:1982
#4 0x00007ffff771028e in -[GSNibLoader
loadModelData:externalNameTable:withZone:] (self=0xde8158,
_cmd=0x7ffff7a56260 <.objc_selector_list+224>, data=""
context=0xcb09f8,
zone=0x329060bb38 <default_zone>) at GSNibLoader.m:87
#5 0x00007ffff753f57d in -[NSNib
instantiateNibWithExternalNameTable:withZone:] (self=0xecf938,
_cmd=0x7ffff79f7b00 <.objc_selector_list+160>,
externalNameTable=0xcb09f8,
zone=0x329060bb38 <default_zone>) at NSNib.m:153
#6 0x00007ffff7453949 in +[NSBundle(NSBundleAdditions)
loadNibFile:externalNameTable:withZone:] (self=0x329057f000
<_OBJC_CLASS_NSBundle>,
_cmd=0x7ffff79f7b20 <.objc_selector_list+192>, fileName=0xf03638,
context=0xcb09f8, zone=0x329060bb38 <default_zone>) at
NSBundleAdditions.m:236
#7 0x00007ffff7454076 in -[NSBundle(NSBundleAdditions)
loadNibFile:externalNameTable:withZone:] (self=0xd406e8,
_cmd=0x7ffff79f7b20 <.objc_selector_list+192>, fileName=0xeb5498,
context=0xcb09f8, zone=0x329060bb38 <default_zone>) at
NSBundleAdditions.m:342
#8 0x00007ffff7453b5e in +[NSBundle(NSBundleAdditions)
loadNibNamed:owner:] (self=0x329057f000 <_OBJC_CLASS_NSBundle>,
_cmd=0x7ffff79db520 <.objc_selector_list+688>,
aNibName=0xeb5498, owner=0xe67488) at NSBundleAdditions.m:277
#9 0x00007ffff73e2a83 in NSApplicationMain (argc=1, argv=0x7fffffffd330)
at Functions.m:83
So I set up a memory watch for anObject and then I get this:
Hardware watchpoint 4: *0x1843d58
Old value = -140067648
New value = -559023410
0x00007ffff5b81060 in object_setClass () from /usr/lib64/libobjc.so.4.6
(gdb) bt
#0 0x00007ffff5b81060 in object_setClass () from /usr/lib64/libobjc.so.4.6
#1 0x00007ffff6171b45 in NSDeallocateObject (anObject=0x1843d58) at
NSObject.m:855
#2 0x00007ffff61723fc in -[NSObject dealloc] (self=0x1843d58,
_cmd=0x7ffff7a00880 <.objc_selector_list+2464>) at NSObject.m:1385
#3 0x00007ffff745ffc1 in -[NSCell dealloc] (self=0x1843d58,
_cmd=0x7ffff79fc290 <.objc_selector_list+1648>) at NSCell.m:234
#4 0x00007ffff7455537 in -[NSButtonCell dealloc] (self=0x1843d58,
_cmd=0x7ffff7a53ec0 <.objc_selector_list+832>) at NSButtonCell.m:185
#5 0x00007ffff75390b0 in -[NSMenuItemCell dealloc] (self=0x1843d58,
_cmd=0x7ffff7a6c490 <.objc_selector_list+1856>) at
NSMenuItemCell.m:112
#6 0x00007ffff755cd05 in -[NSPopUpButtonCell dealloc] (self=0x1843d58,
_cmd=0x7ffff6678370 <.objc_selector_list+560>) at
NSPopUpButtonCell.m:158
#7 0x00007ffff6173739 in -[NSObject release] (self=0x1843d58,
_cmd=0x7ffff6662ff0 <.objc_selector_list+784>) at NSObject.m:2070
#8 0x00007ffff61391b4 in GSIArraySetItemAtIndex (array=0x13b6770,
item=..., index=66) at ../Headers/GNUstepBase/GSIArray.h:531
#9 0x00007ffff6139911 in -[NSKeyedUnarchiver(Private) _decodeObject:]
(self=0xdf0dc8, _cmd=0x7ffff6662fe0 <.objc_selector_list+768>,
index=66) at NSKeyedUnarchiver.m:273
#10 0x00007ffff613be6d in -[NSKeyedUnarchiver decodeObjectForKey:]
(self=0xdf0dc8, _cmd=0x7ffff7a16aa0 <.objc_selector_list+80>,
aKey=0x7ffff7a16940 <.objc_str151>)
at NSKeyedUnarchiver.m:630
#11 0x00007ffff74a058e in -[NSControl initWithCoder:] (self=0x16a8d18,
_cmd=0x7ffff660fdb0 <.objc_selector_list+144>, aDecoder=0xdf0dc8) at
NSControl.m:1012
#12 0x000000010000680e in ?? ()
#13 0x00000000016a8d18 in ?? ()
#14 0x0000000000e42b90 in ?? ()
#15 0x00007fffffff4430 in ?? ()
#16 0x00007ffff76cc5e8 in -[NSClassSwapper
instantiateRealObject:withClassName:] (self=0xe42b90,
_cmd=0x16a8d18, coder=0x10000680e, className=0x7fffffff4390)
at GSNibLoading.m:1416
Frames #12 - #15 are not relevant - basically it's just an
-initWithCoder override in an NSPopUpButton subclass that just calls [super
initWithCoder].
So the target object that was previously set to the NSMenuItem in question
is now deallocated, so _target in NSMenuItem is now a dangling pointer.
To sum it up, it appears that the whole GUI structure of app's main
window is first loaded when NSApplicationMain is called, but later on,
[NSClassSwapper instantiateRealObject] causes some of the parts to be
replaced, which leaves invalid pointers to previous instances behind.
I'm unable to fix it myself. I'd be grateful for any help.
--
Luboš Doležel
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