[GRASS-dev] debugging nviz with TclTk 8.5 aqua

[Michael Barton]

On Jul 22, 2008, at 1:41 PM, Glynn Clements wrote:

>
> Michael Barton wrote:
>
>>> togl and togl->aglCtx are known to be non-NULL (otherwise it would
>>> have crashed before then). Can you try the following:
>>>
>>> 	print ((MacDrawable *) (window))
>>> 	print ((MacDrawable *) (window))->toplevel
>>> 	print ((MacDrawable *) (window))->toplevel->grafPtr
>>
>> I'm assuming that you mean to enter these lines in gdb. Here is the
>> result.
>
>> (gdb) print ((MacDrawable *) (window))
>> No symbol "MacDrawable" in current context.
>
> Hmm; does this work:
>
> 	print ((struct TkWindowPrivate *) (window))
> 	print ((struct TkWindowPrivate *) (window))->toplevel
> 	print ((struct TkWindowPrivate *) (window))->toplevel->grafPtr
> ?
>
> Failing that, just:
>
> 	print window
>
> might provide a clue.
>
> OTOH, I'm not sure if any of this will actually help in the end. The
> conclusion may well just be "Togl doesn't work with 8.5". I can't see
> any references to 8.5 on the Togl site (it isn't a particularly active
> project).

This actually produced some results.

(gdb) run -f $GISBASE/etc/nviz2.2/scripts/nviz2.2_script -q
Starting program: /Applications/Grass/GRASS-7.0.app/Contents/MacOS/etc/ 
nviz2.2/nviz -f $GISBASE/etc/nviz2.2/scripts/nviz2.2_script -q
Reading symbols for shared libraries ++++++++++++++++++++++ 
+ 
...................................................................................... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries ....... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x0000002c
0x0001702d in Togl_CreateWindow (tkwin=0x1fcb608, parent=30918536,  
instanceData=0x757ce0) at togl.c:2338
2338	        if (!aglSetDrawable(togl->aglCtx,
(gdb) print ((struct TkWindowPrivate *) (window))
$1 = (struct TkWindowPrivate *) 0x1d7c648
(gdb) print ((struct TkWindowPrivate *) (window))->toplevel
$2 = (struct TkWindowPrivate *) 0x28
(gdb) print ((struct TkWindowPrivate *) (window))->toplevel->grafPtr
Cannot access memory at address 0x2c
(gdb) print window
$3 = 30918216
(gdb)

Michael