Need tips debugging a crash porting an app to cygwin caused by sth overwriting a function
Dalibor Topic
robilad@kaffe.org
Thu Dec 18 02:08:00 GMT 2003
Hi Christopher,
Christopher Faylor wrote:
> On Wed, Dec 17, 2003 at 11:40:39PM +0100, Dalibor Topic wrote:
>
>>I was thinking about defining a gdb command along the lines of
>>
>>define my-stepi-watch
>>while (*(long *) findJarFiles == original_value)
>>stepi
>>end
>>
>>though I've never done that before, so I'm not sure if that would work ;)
>
>
> It might work but I think you'd probably end up tracking the heat death
> of the universe before you'd see a result. :-)
Then you better prepare to die. ;)
Actually, I've seen a result as soon as I let the macro lose. It turns
out that someverhere between
(1) (gdb) p *(long*) findJarFiles
$1=something
(gdb) b main
(gdb) run
break point in main reached
(2)(gdb) p *(long *) findJarFiles
$2=somethingElse
(1) and (2) the object code of findJarFiles is changed, i.e. even before
the program starts at all. *Now* I'm really puzzled.
Any idea how to debug that? What could it be that's invoked before main
that modifies object code?
cheers,
dalibor topic
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