/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: sw=4 ts=4 et :
 */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Foundation
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Chris Jones <jones.chris.g@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include <stdlib.h>             // for abort()

#if defined(_WIN32)
#  include <signal.h>           // for raise
#elif defined(XP_UNIX)
#  include <unistd.h>           // for _exit
#endif

#include "mozilla/mozalloc_oom.h"

static int gDummyCounter;

void
mozalloc_handle_oom()
{
    // NB: this is handle_oom() stage 1, which simply aborts on OOM.
    // we might proceed to a stage 2 in which an attempt is made to
    // reclaim memory

    // XXX/cjones: most of this function was copied from
    // xpcom/base/nsDebugImpl.cpp:Abort(), except that we assume on
    // UNIX-like platforms can directly abort() rather than need to go
    // through PR_Abort(). we don't want this code to rely on NSPR.

#if defined(_WIN32)
#  if !defined(WINCE)
    //This should exit us
    raise(SIGABRT);
#  endif
    //If we are ignored exit this way..
    _exit(3);
#elif defined(XP_UNIX) || defined(XP_OS2) || defined(XP_BEOS)
    abort();
#else
#  warning not attempting to abort() on this platform
#endif

    // Still haven't aborted?  Try dereferencing null.
    // (Written this way to lessen the likelihood of it being optimized away.)
    gDummyCounter += *((int*) 0); // TODO annotation saying we know 
    // this is crazy
    
    // Still haven't aborted?  Try _exit().
    _exit(127);
}