From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-return-42282-listarch-gdb=sources.redhat.com@sourceware.org>
Received: (qmail 13484 invoked by alias); 26 Jun 2013 18:45:31 -0000
Mailing-List: contact gdb-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb.sourceware.org>
List-Subscribe: <mailto:gdb-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb/>
List-Post: <mailto:gdb@sourceware.org>
List-Help: <mailto:gdb-help@sourceware.org>, <http://sourceware.org/ml/#faqs>
Sender: gdb-owner@sourceware.org
Received: (qmail 13456 invoked by uid 89); 26 Jun 2013 18:45:27 -0000
X-Spam-SWARE-Status: No, score=-7.0 required=5.0 tests=AWL,BAYES_00,RCVD_IN_HOSTKARMA_W,RCVD_IN_HOSTKARMA_WL,RP_MATCHES_RCVD,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.1
Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28)    by sourceware.org (qpsmtpd/0.84/v0.84-167-ge50287c) with ESMTP; Wed, 26 Jun 2013 18:45:27 +0000
Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22])	by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r5QIjNj7017307	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK);	Wed, 26 Jun 2013 14:45:23 -0400
Received: from host2.jankratochvil.net (ovpn-116-40.ams2.redhat.com [10.36.116.40])	by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r5QIjKfl007036	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO);	Wed, 26 Jun 2013 14:45:22 -0400
Date: Wed, 26 Jun 2013 18:45:00 -0000
From: Jan Kratochvil <jan.kratochvil@redhat.com>
To: jian shen <vicshen@gmail.com>
Cc: gdb@sourceware.org
Subject: Re: gdb cannot call help function in replay mode
Message-ID: <20130626184518.GA3080@host2.jankratochvil.net>
References: <CAC5CAUrgKcRcm_WnJigB5UNrDFqnpQhqmh_b+hUj3t-sz1pqGw@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAC5CAUrgKcRcm_WnJigB5UNrDFqnpQhqmh_b+hUj3t-sz1pqGw@mail.gmail.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
X-IsSubscribed: yes
X-SW-Source: 2013-06/txt/msg00058.txt.bz2

On Tue, 25 Jun 2013 06:11:26 +0200, jian shen wrote:
> In below example, when I try to call function getA1() in replay mode, gdb give
> warning that it will write memory and make the execution log unusable, although
> this function does not write memory, only read memory.

The function writes to stack and registers.


> In real project, I have some helper function to dump what a handle is.  But in
> replay mode, I could not call such functions.  This limitation makes the replay
> mode almost unusable to me.  Any suggestion?

You should use Python Pretty Printer instead.  This will also work for core
file analysis where you also cannot call inferior functions.


Jan