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d38d4e5d | 1 | // Allocator that wraps "C" malloc -*- C++ -*- |
1ff9402d | 2 | |
85ec4feb | 3 | // Copyright (C) 2001-2018 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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
1ff9402d BK |
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 | ||
748086b7 JJ |
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/>. | |
1ff9402d | 24 | |
0aa06b18 BK |
25 | /** @file ext/malloc_allocator.h |
26 | * This file is a GNU extension to the Standard C++ Library. | |
27 | */ | |
28 | ||
1ff9402d BK |
29 | #ifndef _MALLOC_ALLOCATOR_H |
30 | #define _MALLOC_ALLOCATOR_H 1 | |
31 | ||
4ec3604f | 32 | #include <cstdlib> |
ace4c2f0 | 33 | #include <cstddef> |
d38d4e5d | 34 | #include <new> |
a063e891 | 35 | #include <bits/functexcept.h> |
ca0f8fd1 | 36 | #include <bits/move.h> |
1b5dc776 JW |
37 | #if __cplusplus >= 201103L |
38 | #include <type_traits> | |
39 | #endif | |
1ff9402d | 40 | |
12ffa228 BK |
41 | namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
42 | { | |
43 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
3cbc7af0 | 44 | |
05a2763e MG |
45 | using std::size_t; |
46 | using std::ptrdiff_t; | |
47 | ||
1ff9402d | 48 | /** |
0aa06b18 | 49 | * @brief An allocator that uses malloc. |
5b9daa7e | 50 | * @ingroup allocators |
d38d4e5d BK |
51 | * |
52 | * This is precisely the allocator defined in the C++ Standard. | |
53 | * - all allocation calls malloc | |
54 | * - all deallocation calls free | |
1ff9402d | 55 | */ |
d38d4e5d BK |
56 | template<typename _Tp> |
57 | class malloc_allocator | |
1ff9402d | 58 | { |
1ff9402d | 59 | public: |
d38d4e5d BK |
60 | typedef size_t size_type; |
61 | typedef ptrdiff_t difference_type; | |
62 | typedef _Tp* pointer; | |
63 | typedef const _Tp* const_pointer; | |
64 | typedef _Tp& reference; | |
65 | typedef const _Tp& const_reference; | |
66 | typedef _Tp value_type; | |
1ff9402d | 67 | |
d38d4e5d BK |
68 | template<typename _Tp1> |
69 | struct rebind | |
70 | { typedef malloc_allocator<_Tp1> other; }; | |
1ff9402d | 71 | |
1b5dc776 JW |
72 | #if __cplusplus >= 201103L |
73 | // _GLIBCXX_RESOLVE_LIB_DEFECTS | |
74 | // 2103. propagate_on_container_move_assignment | |
75 | typedef std::true_type propagate_on_container_move_assignment; | |
76 | #endif | |
77 | ||
3be9ded2 | 78 | _GLIBCXX20_CONSTEXPR |
7d9cb054 | 79 | malloc_allocator() _GLIBCXX_USE_NOEXCEPT { } |
1ff9402d | 80 | |
3be9ded2 | 81 | _GLIBCXX20_CONSTEXPR |
7d9cb054 | 82 | malloc_allocator(const malloc_allocator&) _GLIBCXX_USE_NOEXCEPT { } |
d38d4e5d BK |
83 | |
84 | template<typename _Tp1> | |
3be9ded2 | 85 | _GLIBCXX20_CONSTEXPR |
7d9cb054 PC |
86 | malloc_allocator(const malloc_allocator<_Tp1>&) |
87 | _GLIBCXX_USE_NOEXCEPT { } | |
d38d4e5d | 88 | |
7d9cb054 | 89 | ~malloc_allocator() _GLIBCXX_USE_NOEXCEPT { } |
d38d4e5d BK |
90 | |
91 | pointer | |
7d9cb054 PC |
92 | address(reference __x) const _GLIBCXX_NOEXCEPT |
93 | { return std::__addressof(__x); } | |
d38d4e5d BK |
94 | |
95 | const_pointer | |
7d9cb054 PC |
96 | address(const_reference __x) const _GLIBCXX_NOEXCEPT |
97 | { return std::__addressof(__x); } | |
d38d4e5d BK |
98 | |
99 | // NB: __n is permitted to be 0. The C++ standard says nothing | |
100 | // about what the return value is when __n == 0. | |
101 | pointer | |
90f8b692 | 102 | allocate(size_type __n, const void* = 0) |
58c95921 | 103 | { |
e762c6f4 | 104 | if (__n > this->max_size()) |
a063e891 PC |
105 | std::__throw_bad_alloc(); |
106 | ||
b08c2bc7 | 107 | pointer __ret = 0; |
ace4c2f0 JW |
108 | #if __cpp_aligned_new |
109 | #if __cplusplus > 201402L && _GLIBCXX_HAVE_ALIGNED_ALLOC | |
110 | if (alignof(_Tp) > alignof(std::max_align_t)) | |
111 | { | |
112 | __ret = static_cast<_Tp*>(::aligned_alloc(alignof(_Tp), | |
113 | __n * sizeof(_Tp))); | |
114 | } | |
115 | #else | |
116 | # define _GLIBCXX_CHECK_MALLOC_RESULT | |
117 | #endif | |
118 | #endif | |
119 | if (!__ret) | |
120 | __ret = static_cast<_Tp*>(std::malloc(__n * sizeof(_Tp))); | |
58c95921 | 121 | if (!__ret) |
a063e891 | 122 | std::__throw_bad_alloc(); |
ace4c2f0 JW |
123 | #ifdef _GLIBCXX_CHECK_MALLOC_RESULT |
124 | #undef _GLIBCXX_CHECK_MALLOC_RESULT | |
125 | if (reinterpret_cast<std::size_t>(__ret) % alignof(_Tp)) | |
126 | { | |
127 | // Memory returned by malloc is not suitably aligned for _Tp. | |
128 | deallocate(__ret, __n); | |
129 | std::__throw_bad_alloc(); | |
130 | } | |
131 | #endif | |
58c95921 DM |
132 | return __ret; |
133 | } | |
d38d4e5d BK |
134 | |
135 | // __p is not permitted to be a null pointer. | |
136 | void | |
dcec0389 | 137 | deallocate(pointer __p, size_type) |
113008b5 | 138 | { std::free(static_cast<void*>(__p)); } |
d38d4e5d BK |
139 | |
140 | size_type | |
7d9cb054 | 141 | max_size() const _GLIBCXX_USE_NOEXCEPT |
422a9f77 JW |
142 | { |
143 | #if __PTRDIFF_MAX__ < __SIZE_MAX__ | |
144 | return size_t(__PTRDIFF_MAX__) / sizeof(_Tp); | |
145 | #else | |
146 | return size_t(-1) / sizeof(_Tp); | |
147 | #endif | |
148 | } | |
d38d4e5d | 149 | |
734f5023 | 150 | #if __cplusplus >= 201103L |
45ba8f9f JW |
151 | template<typename _Up, typename... _Args> |
152 | void | |
153 | construct(_Up* __p, _Args&&... __args) | |
0f317ef7 MG |
154 | noexcept(noexcept(::new((void *)__p) |
155 | _Up(std::forward<_Args>(__args)...))) | |
45ba8f9f JW |
156 | { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); } |
157 | ||
158 | template<typename _Up> | |
159 | void | |
0f317ef7 MG |
160 | destroy(_Up* __p) |
161 | noexcept(noexcept(__p->~_Up())) | |
162 | { __p->~_Up(); } | |
45ba8f9f | 163 | #else |
d38d4e5d BK |
164 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
165 | // 402. wrong new expression in [some_] allocator::construct | |
166 | void | |
167 | construct(pointer __p, const _Tp& __val) | |
61fcb9fb PC |
168 | { ::new((void *)__p) value_type(__val); } |
169 | ||
d38d4e5d BK |
170 | void |
171 | destroy(pointer __p) { __p->~_Tp(); } | |
45ba8f9f | 172 | #endif |
f263b26e | 173 | |
c7790bdb JW |
174 | template<typename _Up> |
175 | friend bool | |
176 | operator==(const malloc_allocator&, const malloc_allocator<_Up>&) | |
177 | _GLIBCXX_NOTHROW | |
178 | { return true; } | |
179 | ||
180 | template<typename _Up> | |
181 | friend bool | |
182 | operator!=(const malloc_allocator&, const malloc_allocator<_Up>&) | |
183 | _GLIBCXX_NOTHROW | |
184 | { return false; } | |
185 | }; | |
3cbc7af0 | 186 | |
12ffa228 BK |
187 | _GLIBCXX_END_NAMESPACE_VERSION |
188 | } // namespace | |
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189 | |
190 | #endif |