Re: Interesting error in GWorkspace

[Riccardo Mottola]

Hi
> ok, gdb must be confused because there is an NSAffineTransform.m in both base 
> and gui.
>
> Sorry, I'm not sure what to try next :-/
me neither. I wonder if this a bug in base? I think not, I feel that 
something is passing bad transform parameters.

I was able to break into it by setting another breakpoint of the method 
and then removing it... a bit unrepeatable but one time it worked and I 
got this:

#0  -[NSAffineTransform invert] (self=0xb901b314, _cmd=0xbbaf14d8)
    at NSAffineTransform.m:253
#1  0xbb999824 in -[NSView _rebuildCoordinates] (self=0xb9f51be4,
    _cmd=0xbbaf14a0) at NSView.m:348
#2  0xbb98bf16 in -[NSView visibleRect] (self=0xb9f51be4, _cmd=0xbbaf14e0)
    at NSView.m:2677
#3  0xbb98c5be in -[NSView lockFocus] (self=0xb9f51be4, _cmd=0xbba8ba18)
    at NSView.m:2343
#4  0xbb8abfae in -[NSImage lockFocusOnRepresentation:] (self=0xb901b254,
    _cmd=0xbba8b9f8, imageRep=0x0) at NSImage.m:1072
#5  0xbb8a5c0e in -[NSImage lockFocus] (self=0xb901b254, _cmd=0x8103c80)
    at NSImage.m:1048
#6  0x08077984 in -[Dock setBackImage] (self=0xba0dff04, _cmd=0x8103cc8)
    at Desktop/Dock/Dock.m:418
#7  0x080790c5 in -[Dock tile] (self=0xba0dff04, _cmd=0x80fcc98)
    at Desktop/Dock/Dock.m:490
#8  0x08065bef in -[GWDesktopManager activateDesktop] (self=0xb9e58104,
    _cmd=0x80f6a20) at Desktop/GWDesktopManager.m:158
#9  0x0805749a in -[GWorkspace applicationWillFinishLaunching:] (
    self=0xbacb3604, _cmd=0xbba4c060, aNotification=0xba101a84)
    at GWorkspace.m:437
#10 0xbb4d3ba5 in -[NSNotificationCenter _postAndRelease:] 
(self=0xbac812a4,
    _cmd=0xbb6f7bc0, notification=0xba101a84) at 
NSNotificationCenter.m:1223

det is indeed 0.

now, I cannot access A, B, C, D for some reason, however moving up one 
in the stack inside NSView, I checked the "ts" structure:
(gdb) p ts
$6 = {m11 = 1, m12 = 0, m21 = 0, m22 = 0, tX = 0, tY = 0}

I don't think this is very sane.

Inside NSView I also see:
(gdb) p _frameMatrix
$7 = (struct objc_object *) 0x0
(gdb) p _frame
$8 = {origin = {x = 0, y = 0}, size = {width = 0, height = 0}}

well, doing transforms of 0 stuff is useless, perhaps NSAffineTransform 
should be smart checking for 0 values, but at the end I don't think it 
makes sense to have them at all. The View itself seems pretty messed up:

po self
 h=-&- v=-&- <NSView: 0xb9f51be4> f={x = 0; y = 0; width = 0; height = 
0} b={x = 0; y = nan; width = 0; height = 1.28695e-41}

This comes further up from an NSImage, I tried to po [NSImage name] but 
gdb crashed and afterwards I wasn't able rerun and get in to the 
breakpoint again...

Riccardo