1// Support routines for the -*- C++ -*- dynamic memory management.
2
3// Copyright (C) 1997-2017 Free Software Foundation, Inc.
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 <cstdlib>
28#include <bits/exception_defines.h>
29#include "new"
30
31using std::new_handler;
32using std::bad_alloc;
33#if _GLIBCXX_HOSTED
34using std::malloc;
35#else
36// A freestanding C runtime may not provide "malloc" -- but there is no
37// other reasonable way to implement "operator new".
38extern "C" void *malloc (std::size_t);
39#endif
40
41_GLIBCXX_WEAK_DEFINITION void *
42operator new (std::size_t sz) _GLIBCXX_THROW (std::bad_alloc)
43{
44 void *p;
45
46 /* malloc (0) is unpredictable; avoid it. */
47 if (sz == 0)
48 sz = 1;
49
50 while (__builtin_expect ((p = malloc (sz)) == 0, false))
51 {
52 new_handler handler = std::get_new_handler ();
53 if (! handler)
54 _GLIBCXX_THROW_OR_ABORT(bad_alloc());
55 handler ();
56 }
57
58 return p;
59}
60