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
|
// The -*- C++ -*- dynamic memory management header.
// Copyright (C) 1994-2017 Free Software Foundation, Inc.
// This file is part of GCC.
//
// GCC is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// GCC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file new
* This is a Standard C++ Library header.
*
* The header @c new defines several functions to manage dynamic memory and
* handling memory allocation errors; see
* http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more.
*/
#ifndef _NEW
#define _NEW
#pragma GCC system_header
#include <bits/c++config.h>
#include <exception>
#pragma GCC visibility push(default)
extern "C++" {
namespace std
{
/**
* @brief Exception possibly thrown by @c new.
* @ingroup exceptions
*
* @c bad_alloc (or classes derived from it) is used to report allocation
* errors from the throwing forms of @c new. */
class bad_alloc : public exception
{
public:
bad_alloc() throw() { }
// This declaration is not useless:
// http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
virtual ~bad_alloc() throw();
// See comment in eh_exception.cc.
virtual const char* what() const throw();
};
#if __cplusplus >= 201103L
class bad_array_new_length : public bad_alloc
{
public:
bad_array_new_length() throw() { };
// This declaration is not useless:
// http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
virtual ~bad_array_new_length() throw();
// See comment in eh_exception.cc.
virtual const char* what() const throw();
};
#endif
#if __cpp_aligned_new
enum class align_val_t: size_t {};
#endif
struct nothrow_t
{
#if __cplusplus >= 201103L
explicit nothrow_t() = default;
#endif
};
extern const nothrow_t nothrow;
/** If you write your own error handler to be called by @c new, it must
* be of this type. */
typedef void (*new_handler)();
/// Takes a replacement handler as the argument, returns the
/// previous handler.
new_handler set_new_handler(new_handler) throw();
#if __cplusplus >= 201103L
/// Return the current new handler.
new_handler get_new_handler() noexcept;
#endif
} // namespace std
//@{
/** These are replaceable signatures:
* - normal single new and delete (no arguments, throw @c bad_alloc on error)
* - normal array new and delete (same)
* - @c nothrow single new and delete (take a @c nothrow argument, return
* @c NULL on error)
* - @c nothrow array new and delete (same)
*
* Placement new and delete signatures (take a memory address argument,
* does nothing) may not be replaced by a user's program.
*/
void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
__attribute__((__externally_visible__));
void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
__attribute__((__externally_visible__));
void operator delete(void*) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
#if __cpp_sized_deallocation
void operator delete(void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void operator delete[](void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
#endif
void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
__attribute__((__externally_visible__));
#if __cpp_aligned_new
void* operator new(std::size_t, std::align_val_t)
__attribute__((__externally_visible__));
void* operator new(std::size_t, std::align_val_t, const std::nothrow_t&)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete(void*, std::align_val_t)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete(void*, std::align_val_t, const std::nothrow_t&)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void* operator new[](std::size_t, std::align_val_t)
__attribute__((__externally_visible__));
void* operator new[](std::size_t, std::align_val_t, const std::nothrow_t&)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete[](void*, std::align_val_t)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete[](void*, std::align_val_t, const std::nothrow_t&)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
#if __cpp_sized_deallocation
void operator delete(void*, std::size_t, std::align_val_t)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete[](void*, std::size_t, std::align_val_t)
_GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
#endif // __cpp_sized_deallocation
#endif // __cpp_aligned_new
// Default placement versions of operator new.
inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
{ return __p; }
inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
{ return __p; }
// Default placement versions of operator delete.
inline void operator delete (void*, void*) _GLIBCXX_USE_NOEXCEPT { }
inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { }
//@}
} // extern "C++"
#if __cplusplus > 201402L
#if __GNUC__ >= 7
# define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
#elif defined __has_builtin
// For non-GNU compilers:
# if __has_builtin(__builtin_launder)
# define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
# endif
#endif
#ifdef _GLIBCXX_HAVE_BUILTIN_LAUNDER
namespace std
{
#define __cpp_lib_launder 201606
/// Pointer optimization barrier [ptr.launder]
template<typename _Tp>
constexpr _Tp*
launder(_Tp* __p) noexcept
{ return __builtin_launder(__p); }
// The program is ill-formed if T is a function type or
// (possibly cv-qualified) void.
template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
void launder(_Ret (*)(_Args...) _GLIBCXX_NOEXCEPT_QUAL) = delete;
template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
void launder(_Ret (*)(_Args......) _GLIBCXX_NOEXCEPT_QUAL) = delete;
void launder(void*) = delete;
void launder(const void*) = delete;
void launder(volatile void*) = delete;
void launder(const volatile void*) = delete;
}
#endif // _GLIBCXX_HAVE_BUILTIN_LAUNDER
#undef _GLIBCXX_HAVE_BUILTIN_LAUNDER
#endif // C++17
#pragma GCC visibility pop
#endif
|
