From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-return-33429-listarch-gdb=sources.redhat.com@sourceware.org>
Received: (qmail 25533 invoked by alias); 9 Dec 2008 21:49:04 -0000
Received: (qmail 25469 invoked by uid 22791); 9 Dec 2008 21:49:03 -0000
X-Spam-Check-By: sourceware.org
Received: from yw-out-1718.google.com (HELO yw-out-1718.google.com) (74.125.46.157)     by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 09 Dec 2008 21:48:20 +0000
Received: by yw-out-1718.google.com with SMTP id 9so110498ywk.48         for <gdb@sourceware.org>; Tue, 09 Dec 2008 13:48:17 -0800 (PST)
Received: by 10.100.109.13 with SMTP id h13mr564479anc.21.1228859297789;         Tue, 09 Dec 2008 13:48:17 -0800 (PST)
Received: by 10.100.126.3 with HTTP; Tue, 9 Dec 2008 13:48:17 -0800 (PST)
Message-ID: <568e62a40812091348w720d2240j6ac4e46747c13e46@mail.gmail.com>
Date: Tue, 09 Dec 2008 21:49:00 -0000
From: "ying lcs" <yinglcs@gmail.com>
To: gdb@sourceware.org
Subject: Need help in understanding GDB stack trace
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
X-IsSubscribed: yes
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
X-SW-Source: 2008-12/txt/msg00029.txt.bz2

All,

I need help in understadning Gdb stack trace:

[Switching to Thread 0xb73b4700 (LWP 28041)]
0x00000000 in ?? ()
(gdb) bt
#0  0x00000000 in ?? ()
#1  0xb5bfc9a6 in DefaultSerializeElementRule::serializeStart (this=0xa450e40,
    domElement=0xa03e104, fd=0xa450ab0)
    at /media/storage/working/content/serializer/src/DefaultSerializeElementRule.cpp:55

And here is my method:

void DefaultSerializeElementRule::serializeStart(nsIDOMElement*
domElement, FILE* fd) {

  nsAutoString tagName;

  domElement->GetTagName(tagName);

  fprintf(fd, "<%s", NS_ConvertUTF16toUTF8(tagName).get());
  // this is line 55:
  serializeAttribute(domElement, fd);

}


I don't understand what is the meaning of :
0x00000000 in ?? ()

from the stack trace, both my domElement, fd are not null. So why my
program crashes?

Thank you.