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Message-ID: <3FE10A7B.9080208@kaffe.org>
Date: Thu, 18 Dec 2003 03:01:31 +0100
From: Dalibor Topic <robilad AT kaffe DOT org>
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To: cygwin AT cygwin DOT com
Subject: Re: Need tips debugging a crash porting an app to cygwin caused by sth overwriting a function
References: <3FE0A59A DOT 6060802 AT kaffe DOT org> <20031217213508 DOT GE6296 AT redhat DOT com> <3FE0D154 DOT 4050205 AT kaffe DOT org> <20031217221440 DOT GA7817 AT redhat DOT com> <3FE0DB67 DOT 8090009 AT kaffe DOT org> <20031217225050 DOT GA8372 AT redhat DOT com>
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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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