Re: Different output from -gdb-show than show

[Pedro Alves <pedro@codesourcery.com>]

On Tuesday 31 August 2010 20:10:15, Michael Snyder wrote:
> >> I did try this patch, and after failing to set "reverse", it
> >> still shows "Forward".
> >>
> >> What am I missing?
> > 
> > That "-gdb-show exec-direction" reads from exec_direction.  See
> > Marc's original bug report upthread.  :-)
> > 
> 
> I don't see how, since it's a static variable and I've looked at
> every local reference to it.

A pointer to it is passed to add_setshow_enum_cmd:

  add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names,
			&exec_direction, _("Set direction of execution.\n\
Options are 'forward' or 'reverse'."),
			_("Show direction of execution (forward/reverse)."),
			_("Tells gdb whether to execute forward or backward."),
			set_exec_direction_func, show_exec_direction_func,
			&setlist, &showlist);

"-gdb-show exec-direction" does not call the set callback, it prints the command's
control enum value directly.

 (gdb) show exec-direction 
 Forward.
 (gdb) interpreter-exec mi "-gdb-show exec-direction"
 ^done,value="forward"
  (gdb) 

Note "Forward." vs "forward".

>   2010-08-31  Michael Snyder  <msnyder@msnyder-server.eng.vmware.com>
> 
>         * infrun.c (set_exec_direction_func): Error out if target does not
>         support reverse execution.

Okay.

-- 
Pedro Alves