1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "utilities/debug.hpp"
27
28 #include <new>
29
30 //--------------------------------------------------------------------------------------
31 // Non-product code
32
33 #ifndef PRODUCT
34 // The global operator new should never be called since it will usually indicate
35 // a memory leak. Use CHeapObj as the base class of such objects to make it explicit
36 // that they're allocated on the C heap.
37 // Commented out in product version to avoid conflicts with third-party C++ native code.
38 //
39 // In C++98/03 the throwing new operators are defined with the following signature:
40 //
41 // void* operator new(std::size_tsize) throw(std::bad_alloc);
42 // void* operator new[](std::size_tsize) throw(std::bad_alloc);
43 //
44 // while all the other (non-throwing) new and delete operators are defined with an empty
45 // throw clause (i.e. "operator delete(void* p) throw()") which means that they do not
46 // throw any exceptions (see section 18.4 of the C++ standard).
47 //
48 // In the new C++11/14 standard, the signature of the throwing new operators was changed
49 // by completely omitting the throw clause (which effectively means they could throw any
50 // exception) while all the other new/delete operators where changed to have a 'nothrow'
51 // clause instead of an empty throw clause.
52 //
53 // Unfortunately, the support for exception specifications among C++ compilers is still
54 // very fragile. While some more strict compilers like AIX xlC or HP aCC reject to
55 // override the default throwing new operator with a user operator with an empty throw()
56 // clause, the MS Visual C++ compiler warns for every non-empty throw clause like
57 // throw(std::bad_alloc) that it will ignore the exception specification. The following
58 // operator definitions have been checked to correctly work with all currently supported
59 // compilers and they should be upwards compatible with C++11/14. Therefore
60 // PLEASE BE CAREFUL if you change the signature of the following operators!
61
62 static void * zero = (void *) 0;
63
64 void* operator new(size_t size) /* throw(std::bad_alloc) */ {
65 fatal("Should not call global operator new");
66 return zero;
67 }
68
69 void* operator new [](size_t size) /* throw(std::bad_alloc) */ {
70 fatal("Should not call global operator new[]");
71 return zero;
72 }
73
74 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() {
75 fatal("Should not call global operator new");
76 return 0;
77 }
78
79 void* operator new [](size_t size, std::nothrow_t& nothrow_constant) throw() {
80 fatal("Should not call global operator new[]");
81 return 0;
82 }
83
84 void operator delete(void* p) throw() {
85 fatal("Should not call global delete");
86 }
87
88 void operator delete [](void* p) throw() {
89 fatal("Should not call global delete []");
90 }
91
92 #endif // Non-product