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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
//===----------------------------------------------------------------------===//
//
// 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
//
//
// This file implements the new and delete operators.
//===----------------------------------------------------------------------===//
#include "__cxxabi_config.h"
#include <new>
#include <cstdlib>
#if !defined(_THROW_BAD_ALLOC) || !defined(_LIBCXXABI_WEAK)
#error The _THROW_BAD_ALLOC and _LIBCXXABI_WEAK libc++ macros must \
already be defined by libc++.
#endif
// Implement all new and delete operators as weak definitions
// in this shared library, so that they can be overridden by programs
// that define non-weak copies of the functions.
_LIBCXXABI_WEAK
void *
operator new(std::size_t size) _THROW_BAD_ALLOC
{
if (size == 0)
size = 1;
void* p;
while ((p = ::malloc(size)) == nullptr)
{
// If malloc fails and there is a new_handler,
// call it to try free up memory.
std::new_handler nh = std::get_new_handler();
if (nh)
nh();
else
#ifndef _LIBCXXABI_NO_EXCEPTIONS
throw std::bad_alloc();
#ifdef __EMSCRIPTEN__
// Abort here so that when exceptions are disabled, we do not just
// return 0 when malloc returns 0.
// We could also do this with set_new_handler, but that adds a
// global constructor and a table entry, overhead that we can avoid
// by doing it this way.
abort();
#else
break;
#endif
#endif
}
return p;
}
_LIBCXXABI_WEAK
void*
operator new(size_t size, const std::nothrow_t&) noexcept
{
void* p = nullptr;
#ifndef _LIBCXXABI_NO_EXCEPTIONS
try
{
#endif // _LIBCXXABI_NO_EXCEPTIONS
p = ::operator new(size);
#ifndef _LIBCXXABI_NO_EXCEPTIONS
}
catch (...)
{
}
#endif // _LIBCXXABI_NO_EXCEPTIONS
return p;
}
_LIBCXXABI_WEAK
void*
operator new[](size_t size) _THROW_BAD_ALLOC
{
return ::operator new(size);
}
_LIBCXXABI_WEAK
void*
operator new[](size_t size, const std::nothrow_t&) noexcept
{
void* p = nullptr;
#ifndef _LIBCXXABI_NO_EXCEPTIONS
try
{
#endif // _LIBCXXABI_NO_EXCEPTIONS
p = ::operator new[](size);
#ifndef _LIBCXXABI_NO_EXCEPTIONS
}
catch (...)
{
}
#endif // _LIBCXXABI_NO_EXCEPTIONS
return p;
}
_LIBCXXABI_WEAK
void
operator delete(void* ptr) noexcept
{
::free(ptr);
}
_LIBCXXABI_WEAK
void
operator delete(void* ptr, const std::nothrow_t&) noexcept
{
::operator delete(ptr);
}
_LIBCXXABI_WEAK
void
operator delete(void* ptr, size_t) noexcept
{
::operator delete(ptr);
}
_LIBCXXABI_WEAK
void
operator delete[] (void* ptr) noexcept
{
::operator delete(ptr);
}
_LIBCXXABI_WEAK
void
operator delete[] (void* ptr, const std::nothrow_t&) noexcept
{
::operator delete[](ptr);
}
_LIBCXXABI_WEAK
void
operator delete[] (void* ptr, size_t) noexcept
{
::operator delete[](ptr);
}
#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION)
_LIBCXXABI_WEAK
void *
operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
{
if (size == 0)
size = 1;
if (static_cast<size_t>(alignment) < sizeof(void*))
alignment = std::align_val_t(sizeof(void*));
// Try allocating memory. If allocation fails and there is a new_handler,
// call it to try free up memory, and try again until it succeeds, or until
// the new_handler decides to terminate.
//
// If allocation fails and there is no new_handler, we throw bad_alloc
// (or return nullptr if exceptions are disabled).
void* p;
while ((p = std::__libcpp_aligned_alloc(static_cast<std::size_t>(alignment), size)) == nullptr)
{
std::new_handler nh = std::get_new_handler();
if (nh)
nh();
else {
#ifndef _LIBCXXABI_NO_EXCEPTIONS
throw std::bad_alloc();
#else
break;
#endif
}
}
return p;
}
_LIBCXXABI_WEAK
void*
operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept
{
void* p = nullptr;
#ifndef _LIBCXXABI_NO_EXCEPTIONS
try
{
#endif // _LIBCXXABI_NO_EXCEPTIONS
p = ::operator new(size, alignment);
#ifndef _LIBCXXABI_NO_EXCEPTIONS
}
catch (...)
{
}
#endif // _LIBCXXABI_NO_EXCEPTIONS
return p;
}
_LIBCXXABI_WEAK
void*
operator new[](size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
{
return ::operator new(size, alignment);
}
_LIBCXXABI_WEAK
void*
operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept
{
void* p = nullptr;
#ifndef _LIBCXXABI_NO_EXCEPTIONS
try
{
#endif // _LIBCXXABI_NO_EXCEPTIONS
p = ::operator new[](size, alignment);
#ifndef _LIBCXXABI_NO_EXCEPTIONS
}
catch (...)
{
}
#endif // _LIBCXXABI_NO_EXCEPTIONS
return p;
}
_LIBCXXABI_WEAK
void
operator delete(void* ptr, std::align_val_t) noexcept
{
std::__libcpp_aligned_free(ptr);
}
_LIBCXXABI_WEAK
void
operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept
{
::operator delete(ptr, alignment);
}
_LIBCXXABI_WEAK
void
operator delete(void* ptr, size_t, std::align_val_t alignment) noexcept
{
::operator delete(ptr, alignment);
}
_LIBCXXABI_WEAK
void
operator delete[] (void* ptr, std::align_val_t alignment) noexcept
{
::operator delete(ptr, alignment);
}
_LIBCXXABI_WEAK
void
operator delete[] (void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept
{
::operator delete[](ptr, alignment);
}
_LIBCXXABI_WEAK
void
operator delete[] (void* ptr, size_t, std::align_val_t alignment) noexcept
{
::operator delete[](ptr, alignment);
}
#endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
|
