1// Support routines for the -*- C++ -*- dynamic memory management.
2// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2004 Free Software Foundation
3//
4// This file is part of GCC.
5//
6// GCC is free software; you can redistribute it and/or modify
7// it under the terms of the GNU General Public License as published by
8// the Free Software Foundation; either version 2, or (at your option)
9// any later version.
10//
11// GCC is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15//
16// You should have received a copy of the GNU General Public License
17// along with GCC; see the file COPYING.  If not, write to
18// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19// Boston, MA 02110-1301, USA.
20//
21// As a special exception, you may use this file as part of a free software
22// library without restriction.  Specifically, if other files instantiate
23// templates or use macros or inline functions from this file, or you compile
24// this file and link it with other files to produce an executable, this
25// file does not by itself cause the resulting executable to be covered by
26// the GNU General Public License.  This exception does not however
27// invalidate any other reasons why the executable file might be covered by
28// the GNU General Public License.
29
30#include <bits/c++config.h>
31#include <exception_defines.h>
32#include "new"
33
34using std::new_handler;
35using std::bad_alloc;
36
37extern "C" void *malloc (std::size_t);
38extern new_handler __new_handler;
39
40_GLIBCXX_WEAK_DEFINITION void *
41operator new (std::size_t sz, const std::nothrow_t&) throw()
42{
43  void *p;
44
45  /* malloc (0) is unpredictable; avoid it.  */
46  if (sz == 0)
47    sz = 1;
48  p = (void *) malloc (sz);
49  while (p == 0)
50    {
51      new_handler handler = __new_handler;
52      if (! handler)
53	return 0;
54      try
55	{
56	  handler ();
57	}
58      catch (bad_alloc &)
59	{
60	  return 0;
61	}
62
63      p = (void *) malloc (sz);
64    }
65
66  return p;
67}
68