1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___MEMORY_ALLOCATOR_H
#define _LIBCPP___MEMORY_ALLOCATOR_H
#include <__config>
#include <__memory/allocator_traits.h>
#include <__utility/forward.h>
#include <cstddef>
#include <new>
#include <stdexcept>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp> class allocator;
#if _LIBCPP_STD_VER <= 17
template <>
class _LIBCPP_TEMPLATE_VIS allocator<void>
{
public:
_LIBCPP_DEPRECATED_IN_CXX17 typedef void* pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const void* const_pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef void value_type;
template <class _Up> struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {typedef allocator<_Up> other;};
};
template <>
class _LIBCPP_TEMPLATE_VIS allocator<const void>
{
public:
_LIBCPP_DEPRECATED_IN_CXX17 typedef const void* pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const void* const_pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const void value_type;
template <class _Up> struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {typedef allocator<_Up> other;};
};
#endif
// This class provides a non-trivial default constructor to the class that derives from it
// if the condition is satisfied.
//
// The second template parameter exists to allow giving a unique type to __non_trivial_if,
// which makes it possible to avoid breaking the ABI when making this a base class of an
// existing class. Without that, imagine we have classes D1 and D2, both of which used to
// have no base classes, but which now derive from __non_trivial_if. The layout of a class
// that inherits from both D1 and D2 will change because the two __non_trivial_if base
// classes are not allowed to share the same address.
//
// By making those __non_trivial_if base classes unique, we work around this problem and
// it is safe to start deriving from __non_trivial_if in existing classes.
template <bool _Cond, class _Unique>
struct __non_trivial_if { };
template <class _Unique>
struct __non_trivial_if<true, _Unique> {
_LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR __non_trivial_if() _NOEXCEPT { }
};
// allocator
//
// Note: For ABI compatibility between C++20 and previous standards, we make
// allocator<void> trivial in C++20.
template <class _Tp>
class _LIBCPP_TEMPLATE_VIS allocator
: private __non_trivial_if<!is_void<_Tp>::value, allocator<_Tp> >
{
static_assert(!is_volatile<_Tp>::value, "std::allocator does not support volatile types");
public:
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef _Tp value_type;
typedef true_type propagate_on_container_move_assignment;
typedef true_type is_always_equal;
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
allocator() _NOEXCEPT = default;
template <class _Up>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
allocator(const allocator<_Up>&) _NOEXCEPT { }
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
_Tp* allocate(size_t __n) {
if (__n > allocator_traits<allocator>::max_size(*this))
__throw_bad_array_new_length();
if (__libcpp_is_constant_evaluated()) {
return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
} else {
return static_cast<_Tp*>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
}
}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
void deallocate(_Tp* __p, size_t __n) _NOEXCEPT {
if (__libcpp_is_constant_evaluated()) {
::operator delete(__p);
} else {
_VSTD::__libcpp_deallocate((void*)__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
}
}
// C++20 Removed members
#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp* pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* const_pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef _Tp& reference;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& const_reference;
template <class _Up>
struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {
typedef allocator<_Up> other;
};
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
pointer address(reference __x) const _NOEXCEPT {
return _VSTD::addressof(__x);
}
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
const_pointer address(const_reference __x) const _NOEXCEPT {
return _VSTD::addressof(__x);
}
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_IN_CXX17
_Tp* allocate(size_t __n, const void*) {
return allocate(__n);
}
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT {
return size_type(~0) / sizeof(_Tp);
}
template <class _Up, class... _Args>
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
void construct(_Up* __p, _Args&&... __args) {
::new ((void*)__p) _Up(_VSTD::forward<_Args>(__args)...);
}
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
void destroy(pointer __p) {
__p->~_Tp();
}
#endif
};
template <class _Tp>
class _LIBCPP_TEMPLATE_VIS allocator<const _Tp>
: private __non_trivial_if<!is_void<_Tp>::value, allocator<const _Tp> >
{
static_assert(!is_volatile<_Tp>::value, "std::allocator does not support volatile types");
public:
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef const _Tp value_type;
typedef true_type propagate_on_container_move_assignment;
typedef true_type is_always_equal;
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
allocator() _NOEXCEPT = default;
template <class _Up>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
allocator(const allocator<_Up>&) _NOEXCEPT { }
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
const _Tp* allocate(size_t __n) {
if (__n > allocator_traits<allocator>::max_size(*this))
__throw_bad_array_new_length();
if (__libcpp_is_constant_evaluated()) {
return static_cast<const _Tp*>(::operator new(__n * sizeof(_Tp)));
} else {
return static_cast<const _Tp*>(_VSTD::__libcpp_allocate(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)));
}
}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
void deallocate(const _Tp* __p, size_t __n) {
if (__libcpp_is_constant_evaluated()) {
::operator delete(const_cast<_Tp*>(__p));
} else {
_VSTD::__libcpp_deallocate((void*) const_cast<_Tp *>(__p), __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
}
}
// C++20 Removed members
#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_ALLOCATOR_MEMBERS)
_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp* const_pointer;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& reference;
_LIBCPP_DEPRECATED_IN_CXX17 typedef const _Tp& const_reference;
template <class _Up>
struct _LIBCPP_DEPRECATED_IN_CXX17 rebind {
typedef allocator<_Up> other;
};
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
const_pointer address(const_reference __x) const _NOEXCEPT {
return _VSTD::addressof(__x);
}
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_INLINE_VISIBILITY _LIBCPP_DEPRECATED_IN_CXX17
const _Tp* allocate(size_t __n, const void*) {
return allocate(__n);
}
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY size_type max_size() const _NOEXCEPT {
return size_type(~0) / sizeof(_Tp);
}
template <class _Up, class... _Args>
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
void construct(_Up* __p, _Args&&... __args) {
::new ((void*)__p) _Up(_VSTD::forward<_Args>(__args)...);
}
_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VISIBILITY
void destroy(pointer __p) {
__p->~_Tp();
}
#endif
};
template <class _Tp, class _Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
bool operator==(const allocator<_Tp>&, const allocator<_Up>&) _NOEXCEPT {return true;}
template <class _Tp, class _Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
bool operator!=(const allocator<_Tp>&, const allocator<_Up>&) _NOEXCEPT {return false;}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___MEMORY_ALLOCATOR_H
|
