1// Support routines for the -*- C++ -*- dynamic memory management.
2// Copyright (C) 1997-2017 Free Software Foundation, Inc.
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 3, 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// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25#include <bits/c++config.h>
26#include <bits/exception_defines.h>
27#include "new"
28
29using std::new_handler;
30using std::bad_alloc;
31
32extern "C" void *malloc (std::size_t);
33
34_GLIBCXX_WEAK_DEFINITION void *
35operator new (std::size_t sz, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
36{
37 void *p;
38
39 /* malloc (0) is unpredictable; avoid it. */
40 if (sz == 0)
41 sz = 1;
42
43 while (__builtin_expect ((p = malloc (sz)) == 0, false))
44 {
45 new_handler handler = std::get_new_handler ();
46 if (! handler)
47 return 0;
48 __try
49 {
50 handler ();
51 }
52 __catch(const bad_alloc&)
53 {
54 return 0;
55 }
56 }
57
58 return p;
59}
60