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Re: questions on debug informations used by gdb
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: Roul Oldenburger <oldenburger dot roul at stn-atlas dot de>
- Cc: gdb at sources dot redhat dot com
- Date: Thu, 3 Jul 2003 08:10:18 -0400
- Subject: Re: questions on debug informations used by gdb
- References: <3F04082C.4050103@stn-atlas.de>
On Thu, Jul 03, 2003 at 12:40:44PM +0200, Roul Oldenburger wrote:
> Hello there,
>
> I am quit new to this topic and also to this list. My apologies if I put
> this question in the wrong place.
>
> Instances of datatypes (esp. structures and records in C and Ada) can be
> viewed using gdb ... using ddd also let me click them to view each
> single component.
> What I am looking for is the information gdb is using to display the
> name and the value of a structure. More precisely I need the positions
> or lets say offsets and sizes of the structures and their components in
> memory. I am hoping to find all I need in the debug information gcc
> includes into the objectfiles.
>
> Unfortunately I haven't found something like a list of what kind of
> information gcc includes and in what format.
>
> Having seen gdb uses the same information I am looking for, I like to
> know where does it get it from. Probably there are functionalities in
> gdb I might use to extract the same information for my purposes?
>
> And in case the informations I need are included, I also like to know if
> there are differences in format if compile for different platforms and
> /or different machines?
>
> If you could help to answer my questions I would be happy!
>
> Probably my questions seem to be basics for you, so I would be happy if
> somone could send me a link to a document or how-to, to solve them on my
> own.
Your best bet is to take a look at the DWARF specification, and
libdwarf. See http://reality.sgiweb.org/~davea/.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer