]>
Commit | Line | Data |
---|---|---|
1ff9402d BK |
1 | // Allocators -*- C++ -*- |
2 | ||
3cbc7af0 | 3 | // Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
1ff9402d BK |
4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 2, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library 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 along | |
17 | // with this library; see the file COPYING. If not, write to the Free | |
83f51799 | 18 | // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
1ff9402d BK |
19 | // 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 | /* | |
31 | * Copyright (c) 1996-1997 | |
32 | * Silicon Graphics Computer Systems, Inc. | |
33 | * | |
34 | * Permission to use, copy, modify, distribute and sell this software | |
35 | * and its documentation for any purpose is hereby granted without fee, | |
36 | * provided that the above copyright notice appear in all copies and | |
37 | * that both that copyright notice and this permission notice appear | |
38 | * in supporting documentation. Silicon Graphics makes no | |
39 | * representations about the suitability of this software for any | |
40 | * purpose. It is provided "as is" without express or implied warranty. | |
41 | */ | |
42 | ||
43 | /** @file ext/debug_allocator.h | |
fa30fe72 | 44 | * This file is a GNU extension to the Standard C++ Library. |
1ff9402d BK |
45 | * You should only include this header if you are using GCC 3 or later. |
46 | */ | |
47 | ||
48 | #ifndef _DEBUG_ALLOCATOR_H | |
49 | #define _DEBUG_ALLOCATOR_H 1 | |
50 | ||
5d1b2a1e | 51 | #include <stdexcept> |
1ff9402d | 52 | |
3cbc7af0 BK |
53 | _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) |
54 | ||
1ff9402d | 55 | /** |
d38d4e5d | 56 | * @brief A meta-allocator with debugging bits, as per [20.4]. |
1ff9402d | 57 | * |
d38d4e5d BK |
58 | * This is precisely the allocator defined in the C++ Standard. |
59 | * - all allocation calls operator new | |
60 | * - all deallocation calls operator delete | |
1ff9402d BK |
61 | */ |
62 | template<typename _Alloc> | |
d38d4e5d | 63 | class debug_allocator |
1ff9402d | 64 | { |
d38d4e5d BK |
65 | public: |
66 | typedef typename _Alloc::size_type size_type; | |
67 | typedef typename _Alloc::difference_type difference_type; | |
68 | typedef typename _Alloc::pointer pointer; | |
69 | typedef typename _Alloc::const_pointer const_pointer; | |
70 | typedef typename _Alloc::reference reference; | |
71 | typedef typename _Alloc::const_reference const_reference; | |
72 | typedef typename _Alloc::value_type value_type; | |
73 | ||
1ff9402d | 74 | private: |
56766e0d DM |
75 | // _M_extra is the number of objects that correspond to the |
76 | // extra space where debug information is stored. | |
77 | size_type _M_extra; | |
d38d4e5d BK |
78 | |
79 | _Alloc _M_allocator; | |
1ff9402d BK |
80 | |
81 | public: | |
56766e0d DM |
82 | debug_allocator() |
83 | { | |
84 | const size_t __obj_size = sizeof(value_type); | |
85 | _M_extra = (sizeof(size_type) + __obj_size - 1) / __obj_size; | |
86 | } | |
87 | ||
88 | pointer | |
89 | allocate(size_type __n) | |
90 | { | |
91 | pointer __res = _M_allocator.allocate(__n + _M_extra); | |
92 | size_type* __ps = reinterpret_cast<size_type*>(__res); | |
93 | *__ps = __n; | |
94 | return __res + _M_extra; | |
95 | } | |
d38d4e5d BK |
96 | |
97 | pointer | |
56766e0d | 98 | allocate(size_type __n, const void* __hint) |
1ff9402d | 99 | { |
56766e0d DM |
100 | pointer __res = _M_allocator.allocate(__n + _M_extra, __hint); |
101 | size_type* __ps = reinterpret_cast<size_type*>(__res); | |
102 | *__ps = __n; | |
103 | return __res + _M_extra; | |
1ff9402d BK |
104 | } |
105 | ||
d38d4e5d BK |
106 | void |
107 | deallocate(pointer __p, size_type __n) | |
1ff9402d | 108 | { |
5d1b2a1e BK |
109 | if (__p) |
110 | { | |
111 | pointer __real_p = __p - _M_extra; | |
112 | if (*reinterpret_cast<size_type*>(__real_p) != __n) | |
113 | { | |
114 | throw std::runtime_error("debug_allocator::deallocate" | |
115 | " wrong size"); | |
116 | } | |
117 | _M_allocator.deallocate(__real_p, __n + _M_extra); | |
118 | } | |
119 | else | |
120 | throw std::runtime_error("debug_allocator::deallocate null pointer"); | |
1ff9402d BK |
121 | } |
122 | }; | |
3cbc7af0 BK |
123 | |
124 | _GLIBCXX_END_NAMESPACE | |
1ff9402d | 125 | |
1ff9402d | 126 | #endif |