EXC-BAD-ACCESS bug
EXC-BAD-ACCESS bug
- Subject: EXC-BAD-ACCESS bug
- From: email@hidden
- Date: Tue, 27 Feb 2007 10:25:31 +0100 (CET)
- Importance: Normal
Hello all,
I'm tracking a "EXC-BAD-EXCESS" bug in my Cocoa project, using
NSZombieEnabled as explained in
http://developer.apple.com/technotes/tn2004/tn2124.html#TABFOUNDATIONVAR.
On my first attempt I got a message like this in the console :
2007-02-27 08:49:52.174 Hardy2[784] *** Selector 'release' sent to
dealloced instance 0x3f2fe90 of class UNKNOWN.Break at '-[_NSZombie
release]' to debug.
(gdb)
So I obediently put a breakpoint on "[_NSZombie release]" ; on the
second attempt all the significant
information I could get was the following :
(gdb) p/a $r4
$3 = 0x90a15918 <_errNewVars+364612>
(gdb) p/a *$r3
$4 = 0xa28806cc <_NSConstantStringClassReference+19200>
(The other register values I inspected were nil or illegible pointers).
I don't know how
to probe deeper into the bug. Below is the function which triggers the bug
(when the program exits it) :
-(void) openDocument:(id) sender
{
NSLog(@"openDocument called");
int result;
NSArray *fileTypes = [NSArray
arrayWithObjects:@"david_Hardy2",@"txt",@"text",@"rtf",@"rtfd",@"htm",@"html",@"webarchive",nil];
GGOpenPanel *oPanel = (GGOpenPanel*) [GGOpenPanel openPanel];
[oPanel again];
result = [oPanel runModalForTypes:fileTypes];
[fileTypes release];
if (result == NSOKButton) {
NSArray *filesToOpen = [oPanel URLs];
NSError** outError;
int i, count = [filesToOpen count];
for (i=0; i<count; i++) {
NSURL* anURL = [filesToOpen objectAtIndex:i];
id currentDoc = [self openDocumentWithContentsOfURL:anURL display:YES
error:outError];
}
}
}
Ewan
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