new_opnt.cc revision 97403 
1// Support routines for the -*- C++ -*- dynamic memory management.
2// Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation
3//
4// This file is part of GNU CC.
5//
6// GNU CC 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// GNU CC 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 GNU CC; see the file COPYING.  If not, write to
18// the Free Software Foundation, 59 Temple Place - Suite 330,
19// Boston, MA 02111-1307, 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 "new"
31#include <exception_defines.h>
32
33using std::new_handler;
34using std::bad_alloc;
35
36extern "C" void *malloc (std::size_t);
37extern new_handler __new_handler;
38
39void *
40operator new (std::size_t sz, const std::nothrow_t&) throw()
41{
42  void *p;
43
44  /* malloc (0) is unpredictable; avoid it.  */
45  if (sz == 0)
46    sz = 1;
47  p = (void *) malloc (sz);
48  while (p == 0)
49    {
50      new_handler handler = __new_handler;
51      if (! handler)
52	return 0;
53      try
54	{
55	  handler ();
56	}
57      catch (bad_alloc &)
58	{
59	  return 0;
60	}
61
62      p = (void *) malloc (sz);
63    }
64
65  return p;
66}
67