1// Support routines for the -*- C++ -*- dynamic memory management.
2// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2004, 2009
3// Free Software Foundation
4//
5// This file is part of GCC.
6//
7// GCC is free software; you can redistribute it and/or modify
8// it under the terms of the GNU General Public License as published by
9// the Free Software Foundation; either version 3, or (at your option)
10// any later version.
11//
12// GCC is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16//
17// Under Section 7 of GPL version 3, you are granted additional
18// permissions described in the GCC Runtime Library Exception, version
19// 3.1, as published by the Free Software Foundation.
20
21// You should have received a copy of the GNU General Public License and
22// a copy of the GCC Runtime Library Exception along with this program;
23// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24// <http://www.gnu.org/licenses/>.
25
26#include <bits/c++config.h>
27#include <exception_defines.h>
28#include "new"
29
30using std::new_handler;
31using std::bad_alloc;
32
33extern "C" void *malloc (std::size_t);
34extern new_handler __new_handler;
35
36_GLIBCXX_WEAK_DEFINITION void *
37operator new (std::size_t sz, const std::nothrow_t&) throw()
38{
39  void *p;
40
41  /* malloc (0) is unpredictable; avoid it.  */
42  if (sz == 0)
43    sz = 1;
44  p = (void *) malloc (sz);
45  while (p == 0)
46    {
47      new_handler handler = __new_handler;
48      if (! handler)
49	return 0;
50      __try
51	{
52	  handler ();
53	}
54      __catch(const bad_alloc&)
55	{
56	  return 0;
57	}
58
59      p = (void *) malloc (sz);
60    }
61
62  return p;
63}
64