[RFA] Reverse debugging, part 1/3: target interface

[Eli Zaretskii]

> Date: Fri, 31 Mar 2006 14:17:20 -0800
> From: Michael Snyder <msnyder@redhat.com>
> 
> OK, folks, ready to submit this for real.

Thanks!

> + /* Forward/reverse execution direction.  
> +    These will only be implemented by a target that supports reverse execution.
> + */
> + #define target_get_execution_direction() \
> +     (current_target.to_get_execdir ? \
> +      (*current_target.to_get_execdir) () : EXEC_ERROR)

Isn't it better if the default will be EXEC_FORWARD, not EXEC_ERROR?

> + /* Reverse execution.  
> +    FIXME: set up as a capability.  */
> + static enum exec_direction_kind remote_execdir = EXEC_FORWARD;
> + 
> + static enum exec_direction_kind remote_get_execdir (void)
> + {
> +   if (remote_debug && info_verbose)
> +     printf_filtered ("remote execdir is %s\n", 
> + 		     remote_execdir == EXEC_FORWARD ? "forward" :
> + 		     remote_execdir == EXEC_REVERSE ? "reverse" :
> + 		     "unknown");
> +   return remote_execdir;
> + }
> + 
> + static int remote_set_execdir (enum exec_direction_kind dir)
> + {
> +   if (remote_debug && info_verbose)
> +     printf_filtered ("Set remote execdir: %s\n",
> + 		     dir == EXEC_FORWARD ? "forward" :
> + 		     dir == EXEC_REVERSE ? "reverse" :
> + 		     "bad direction");
> + 
> +   /* FIXME: check target for capability.  */
> +   if (dir == EXEC_FORWARD || dir == EXEC_REVERSE)
> +     return (remote_execdir = dir);
> +   else
> +     return EXEC_ERROR;
> + }

I don't understand these two methods--they don't seem to do anything
that their names imply.  What am I missing?