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Date: Wed, 21 Aug 2013 14:47:00 -0000
Message-Id: <201308211447.r7LEld3t025510@glazunov.sibelius.xs4all.nl>
From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: palves@redhat.com
CC: yao@codesourcery.com, tromey@redhat.com, gdb-patches@sourceware.org
In-reply-to: <5214D03C.9040703@redhat.com> (message from Pedro Alves on Wed,	21 Aug 2013 15:35:40 +0100)
Subject: Re: [PATCH] PR gdb/15871: Unavailable entry value is not shown correctly
References: <1376379586-24150-1-git-send-email-yao@codesourcery.com> <1376379586-24150-3-git-send-email-yao@codesourcery.com> <87siy4gsn4.fsf@fleche.redhat.com> <521458A8.7060304@codesourcery.com> <5214D03C.9040703@redhat.com>
X-SW-Source: 2013-08/txt/msg00581.txt.bz2

> Date: Wed, 21 Aug 2013 15:35:40 +0100
> From: Pedro Alves <palves@redhat.com>
> 
> On 08/13/2013 08:39 AM, Yao Qi wrote:
> > However, when I run this test, I find j@entry is something like,
> > j@entry=<error reading variable: Cannot access memory at address 0x8049788>
> > instead of unavailable.
> > 
> > I don't emit a fail for it because I am not very sure it is expected
> > to be "unavailable".  I am fine to kfail it.
> > 
> > I looked into a little, and looks reading entry value doesn't use
> > value availability-aware API.  It is not an easy fix to me.
> 
> I looked into this.  Here's a patch.  Let me know what you think.

I think you should simply define the return codes as negative numbers.