1// Support routines for the -*- C++ -*- dynamic memory management.
2
3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004
4// Free Software Foundation
5//
6// This file is part of GCC.
7//
8// GCC is free software; you can redistribute it and/or modify
9// it under the terms of the GNU General Public License as published by
10// the Free Software Foundation; either version 2, or (at your option)
11// any later version.
12//
13// GCC is distributed in the hope that it will be useful,
14// but WITHOUT ANY WARRANTY; without even the implied warranty of
15// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16// GNU General Public License for more details.
17//
18// You should have received a copy of the GNU General Public License
19// along with GCC; see the file COPYING.  If not, write to
20// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21// Boston, MA 02110-1301, USA.
22//
23// As a special exception, you may use this file as part of a free software
24// library without restriction.  Specifically, if other files instantiate
25// templates or use macros or inline functions from this file, or you compile
26// this file and link it with other files to produce an executable, this
27// file does not by itself cause the resulting executable to be covered by
28// the GNU General Public License.  This exception does not however
29// invalidate any other reasons why the executable file might be covered by
30// the GNU General Public License.
31
32#include <bits/c++config.h>
33#include <cstdlib>
34#include <exception_defines.h>
35#include "new"
36
37using std::new_handler;
38using std::bad_alloc;
39#if _GLIBCXX_HOSTED
40using std::malloc;
41#else
42// A freestanding C runtime may not provide "malloc" -- but there is no
43// other reasonable way to implement "operator new".
44extern "C" void *malloc (std::size_t);
45#endif
46
47extern new_handler __new_handler;
48
49_GLIBCXX_WEAK_DEFINITION void *
50operator new (std::size_t sz) throw (std::bad_alloc)
51{
52  void *p;
53
54  /* malloc (0) is unpredictable; avoid it.  */
55  if (sz == 0)
56    sz = 1;
57  p = (void *) malloc (sz);
58  while (p == 0)
59    {
60      new_handler handler = __new_handler;
61      if (! handler)
62#ifdef __EXCEPTIONS
63	throw bad_alloc();
64#else
65        std::abort();
66#endif
67      handler ();
68      p = (void *) malloc (sz);
69    }
70
71  return p;
72}
73