From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Snyder <msnyder@cygnus.com>
To: Andrew Cagney <ac131313@cygnus.com>
Cc: GDB Patches <gdb-patches@sourceware.cygnus.com>
Subject: Re: [rfc] Merge set_register_cache() and supply_register(,NULL)
Date: Fri, 09 Mar 2001 13:46:00 -0000
Message-id: <3AA94C67.C930D6D5@cygnus.com>
References: <3AA8491C.CC265D5E@cygnus.com>
X-SW-Source: 2001-03/msg00155.html

Andrew Cagney wrote:
> 
> Thoughts?
> 
> The attatched merges the semantics of the two sequences:
> 
>         supply_register (, zero_buf);
>         set_register_cache(-1);
> 
> and
> 
>         supply_register (, NULL);
> 
> Making the latter the only interface.  It marks the register as
> unavailable and and stores zeroes in it.
> 
> The only thing looking that this ``unavailable'' status is the GUI
> (Insight).

... that last is not right.  Expression evaluation will look at the
unavailable status, as will "info registers".  If you try to evaluate
the register and it isn't available, you'll get a notification.