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Re: memory address ranges (-var-create)
- From: Daniel Jacobowitz <drow at false dot org>
- To: Nick Roberts <nickrob at snap dot net dot nz>
- Cc: gdb at sources dot redhat dot com
- Date: Sun, 10 Dec 2006 15:53:14 -0500
- Subject: Re: memory address ranges (-var-create)
- References: <17788.28864.16294.719219@kahikatea.snap.net.nz>
On Mon, Dec 11, 2006 at 09:40:32AM +1300, Nick Roberts wrote:
> For
>
> -var-create - * EXPRESSION
>
> the manual says EXPRESSION may be:
>
> * `*ADDR-ADDR' -- a memory address range (TBD)
Weird. That doesn't seem like a good idea, as you found.
> I would like to detect when a string value changes which presumably means
> watching a memory address range. Currently a variable object for a string
> will only detect that the address has changed or the first character
> (the child).
>
> I see that watch expressions do the right thing in Insight, from which the
> variable object code has apparently been taken. Can this code be adapted
> for -var-create?
Would it work for your front end to create a varobj for "(char[7] *)
str" where it computes the length itself?
(gdb) p *(char[7] *) rl_prompt
$13 = "(gdb) "
If that's what you want, we might be able to come up with a smarter way
to handle the special string case, or do it automatically.
--
Daniel Jacobowitz
CodeSourcery