This is the mail archive of the
gdb@sources.redhat.com
mailing list for the GDB project.
Re: Taking the address of a convenience variable value
- From: Bob Rossi <bob at brasko dot net>
- To: Paul Dubuc <pdubuc at cas dot org>
- Cc: GDB Mailing List <gdb at sources dot redhat dot com>
- Date: Tue, 25 May 2004 19:59:58 -0400
- Subject: Re: Taking the address of a convenience variable value
- References: <40B37A92.6020106@cas.org>
On Tue, May 25, 2004 at 12:55:46PM -0400, Paul Dubuc wrote:
> In the June 2004 issue of the C/C++ User's Journal (p. 24) there is an
> article on how to write user-defined commands for gdb to examine the
> contents of STL vectors, sets and maps. It looks extremely useful, so I
> decided to try it modifying the commands for use with the GCC STL, but I
> can't get some of the commands for sets and maps to work. It relies on a
> tecnique that involves being able to take the address of a convenience
> variable value, for example:
>
> set $maptype = &$arg0._M_t._M_header->_M_value_field
> set $maptypep = &$maptype
>
> When I try this the 2nd statement gives me the error message
>
> Attempt to take address of value not located in memory.
>
> It doesn't work with gdb 5.3 or 6.1 on Solaris. The author claims that it
> works on HP-UX, but I don't know why it would be any different.
>
> Is there a way around this? Or is there another source of user-defined
> commands that can be used to print the contents of STL containers in gdb?
> Any help would be very much appreciated.
I read that article and was wondering if it was necessary to compile the
STL with -g and not with -O2. I don't think the author mentioned it, but
how else could all of the symbols in the STL work properly with GDB?
Bob Rossi