1 // -*- C++ -*- 2 //===----------------------------- new ------------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 #ifndef _LIBCPP_NEW 12 #define _LIBCPP_NEW 13 14 /* 15 new synopsis 16 17 namespace std 18 { 19 20 class bad_alloc 21 : public exception 22 { 23 public: 24 bad_alloc() noexcept; 25 bad_alloc(const bad_alloc&) noexcept; 26 bad_alloc& operator=(const bad_alloc&) noexcept; 27 virtual const char* what() const noexcept; 28 }; 29 30 class bad_array_new_length : public bad_alloc // C++14 31 { 32 public: 33 bad_array_new_length() noexcept; 34 }; 35 36 enum class align_val_t : size_t {}; // C++17 37 struct nothrow_t {}; 38 extern const nothrow_t nothrow; 39 typedef void (*new_handler)(); 40 new_handler set_new_handler(new_handler new_p) noexcept; 41 new_handler get_new_handler() noexcept; 42 43 // 21.6.4, pointer optimization barrier 44 template <class T> constexpr T* launder(T* p) noexcept; // C++17 45 } // std 46 47 void* operator new(std::size_t size); // replaceable, nodiscard in C++2a 48 void* operator new(std::size_t size, std::align_val_t alignment); // replaceable, C++17, nodiscard in C++2a 49 void* operator new(std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a 50 void* operator new(std::size_t size, std::align_val_t alignment, 51 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++2a 52 void operator delete(void* ptr) noexcept; // replaceable 53 void operator delete(void* ptr, std::size_t size) noexcept; // replaceable, C++14 54 void operator delete(void* ptr, std::align_val_t alignment) noexcept; // replaceable, C++17 55 void operator delete(void* ptr, std::size_t size, 56 std::align_val_t alignment) noexcept; // replaceable, C++17 57 void operator delete(void* ptr, const std::nothrow_t&) noexcept; // replaceable 58 void operator delete(void* ptr, std:align_val_t alignment, 59 const std::nothrow_t&) noexcept; // replaceable, C++17 60 61 void* operator new[](std::size_t size); // replaceable, nodiscard in C++2a 62 void* operator new[](std::size_t size, 63 std::align_val_t alignment) noexcept; // replaceable, C++17, nodiscard in C++2a 64 void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a 65 void* operator new[](std::size_t size, std::align_val_t alignment, 66 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++2a 67 void operator delete[](void* ptr) noexcept; // replaceable 68 void operator delete[](void* ptr, std::size_t size) noexcept; // replaceable, C++14 69 void operator delete[](void* ptr, 70 std::align_val_t alignment) noexcept; // replaceable, C++17 71 void operator delete[](void* ptr, std::size_t size, 72 std::align_val_t alignment) noexcept; // replaceable, C++17 73 void operator delete[](void* ptr, const std::nothrow_t&) noexcept; // replaceable 74 void operator delete[](void* ptr, std::align_val_t alignment, 75 const std::nothrow_t&) noexcept; // replaceable, C++17 76 77 void* operator new (std::size_t size, void* ptr) noexcept; // nodiscard in C++2a 78 void* operator new[](std::size_t size, void* ptr) noexcept; // nodiscard in C++2a 79 void operator delete (void* ptr, void*) noexcept; 80 void operator delete[](void* ptr, void*) noexcept; 81 82 */ 83 84 #include <__config> 85 #include <exception> 86 #include <type_traits> 87 #include <cstddef> 88 #include <version> 89 #ifdef _LIBCPP_NO_EXCEPTIONS 90 #include <cstdlib> 91 #endif 92 93 #if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 94 #include <new.h> 95 #endif 96 97 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 98 #pragma GCC system_header 99 #endif 100 101 #if !defined(__cpp_sized_deallocation) || __cpp_sized_deallocation < 201309L 102 #define _LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION 103 #endif 104 105 #if !defined(_LIBCPP_BUILDING_LIBRARY) && _LIBCPP_STD_VER < 14 && \ 106 defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 107 # define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 108 #endif 109 110 #if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || \ 111 defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 112 # define _LIBCPP_HAS_NO_SIZED_DEALLOCATION 113 #endif 114 115 #if !__has_builtin(__builtin_operator_new) || \ 116 __has_builtin(__builtin_operator_new) < 201802L 117 #define _LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE 118 #endif 119 120 namespace std // purposefully not using versioning namespace 121 { 122 123 #if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME) 124 struct _LIBCPP_TYPE_VIS nothrow_t {}; 125 extern _LIBCPP_FUNC_VIS const nothrow_t nothrow; 126 127 class _LIBCPP_EXCEPTION_ABI bad_alloc 128 : public exception 129 { 130 public: 131 bad_alloc() _NOEXCEPT; 132 virtual ~bad_alloc() _NOEXCEPT; 133 virtual const char* what() const _NOEXCEPT; 134 }; 135 136 class _LIBCPP_EXCEPTION_ABI bad_array_new_length 137 : public bad_alloc 138 { 139 public: 140 bad_array_new_length() _NOEXCEPT; 141 virtual ~bad_array_new_length() _NOEXCEPT; 142 virtual const char* what() const _NOEXCEPT; 143 }; 144 145 typedef void (*new_handler)(); 146 _LIBCPP_FUNC_VIS new_handler set_new_handler(new_handler) _NOEXCEPT; 147 _LIBCPP_FUNC_VIS new_handler get_new_handler() _NOEXCEPT; 148 149 #endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME 150 151 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void __throw_bad_alloc(); // not in C++ spec 152 153 #if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && \ 154 !defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME) 155 #ifndef _LIBCPP_CXX03_LANG 156 enum class _LIBCPP_ENUM_VIS align_val_t : size_t { }; 157 #else 158 enum align_val_t { __zero = 0, __max = (size_t)-1 }; 159 #endif 160 #endif 161 162 } // std 163 164 #if defined(_LIBCPP_CXX03_LANG) 165 #define _THROW_BAD_ALLOC throw(std::bad_alloc) 166 #else 167 #define _THROW_BAD_ALLOC 168 #endif 169 170 #if !defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME) 171 172 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC; 173 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS; 174 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; 175 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT; 176 #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 177 _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz) _NOEXCEPT; 178 #endif 179 180 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC; 181 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS; 182 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT; 183 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT; 184 #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 185 _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT; 186 #endif 187 188 #ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 189 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 190 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS; 191 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT; 192 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 193 #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 194 _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 195 #endif 196 197 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 198 _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS; 199 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT; 200 _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 201 #ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 202 _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 203 #endif 204 #endif 205 206 _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new (std::size_t, void* __p) _NOEXCEPT {return __p;} 207 _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;} 208 inline _LIBCPP_INLINE_VISIBILITY void operator delete (void*, void*) _NOEXCEPT {} 209 inline _LIBCPP_INLINE_VISIBILITY void operator delete[](void*, void*) _NOEXCEPT {} 210 211 #endif // !_LIBCPP_DEFER_NEW_TO_VCRUNTIME 212 213 _LIBCPP_BEGIN_NAMESPACE_STD 214 215 _LIBCPP_CONSTEXPR inline _LIBCPP_INLINE_VISIBILITY bool __is_overaligned_for_new(size_t __align) _NOEXCEPT { 216 #ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__ 217 return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__; 218 #else 219 return __align > alignment_of<max_align_t>::value; 220 #endif 221 } 222 223 inline _LIBCPP_INLINE_VISIBILITY void *__libcpp_allocate(size_t __size, size_t __align) { 224 #ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 225 if (__is_overaligned_for_new(__align)) { 226 const align_val_t __align_val = static_cast<align_val_t>(__align); 227 # ifdef _LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE 228 return ::operator new(__size, __align_val); 229 # else 230 return __builtin_operator_new(__size, __align_val); 231 # endif 232 } 233 #else 234 ((void)__align); 235 #endif 236 #ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE 237 return ::operator new(__size); 238 #else 239 return __builtin_operator_new(__size); 240 #endif 241 } 242 243 struct _DeallocateCaller { 244 static inline _LIBCPP_INLINE_VISIBILITY 245 void __do_deallocate_handle_size_align(void *__ptr, size_t __size, size_t __align) { 246 #if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 247 ((void)__align); 248 return __do_deallocate_handle_size(__ptr, __size); 249 #else 250 if (__is_overaligned_for_new(__align)) { 251 const align_val_t __align_val = static_cast<align_val_t>(__align); 252 return __do_deallocate_handle_size(__ptr, __size, __align_val); 253 } else { 254 return __do_deallocate_handle_size(__ptr, __size); 255 } 256 #endif 257 } 258 259 static inline _LIBCPP_INLINE_VISIBILITY 260 void __do_deallocate_handle_align(void *__ptr, size_t __align) { 261 #if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 262 ((void)__align); 263 return __do_call(__ptr); 264 #else 265 if (__is_overaligned_for_new(__align)) { 266 const align_val_t __align_val = static_cast<align_val_t>(__align); 267 return __do_call(__ptr, __align_val); 268 } else { 269 return __do_call(__ptr); 270 } 271 #endif 272 } 273 274 private: 275 static inline void __do_deallocate_handle_size(void *__ptr, size_t __size) { 276 #ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 277 ((void)__size); 278 return __do_call(__ptr); 279 #else 280 return __do_call(__ptr, __size); 281 #endif 282 } 283 284 #ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 285 static inline void __do_deallocate_handle_size(void *__ptr, size_t __size, align_val_t __align) { 286 #ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 287 ((void)__size); 288 return __do_call(__ptr, __align); 289 #else 290 return __do_call(__ptr, __size, __align); 291 #endif 292 } 293 #endif 294 295 private: 296 template <class _A1, class _A2> 297 static inline void __do_call(void *__ptr, _A1 __a1, _A2 __a2) { 298 #if defined(_LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE) || \ 299 defined(_LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE) 300 return ::operator delete(__ptr, __a1, __a2); 301 #else 302 return __builtin_operator_delete(__ptr, __a1, __a2); 303 #endif 304 } 305 306 template <class _A1> 307 static inline void __do_call(void *__ptr, _A1 __a1) { 308 #if defined(_LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE) || \ 309 defined(_LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE) 310 return ::operator delete(__ptr, __a1); 311 #else 312 return __builtin_operator_delete(__ptr, __a1); 313 #endif 314 } 315 316 static inline void __do_call(void *__ptr) { 317 #ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE 318 return ::operator delete(__ptr); 319 #else 320 return __builtin_operator_delete(__ptr); 321 #endif 322 } 323 }; 324 325 inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate(void* __ptr, size_t __size, size_t __align) { 326 _DeallocateCaller::__do_deallocate_handle_size_align(__ptr, __size, __align); 327 } 328 329 inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate_unsized(void* __ptr, size_t __align) { 330 _DeallocateCaller::__do_deallocate_handle_align(__ptr, __align); 331 } 332 333 template <class _Tp> 334 _LIBCPP_NODISCARD_AFTER_CXX17 inline 335 _LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT 336 { 337 static_assert (!(is_function<_Tp>::value), "can't launder functions" ); 338 static_assert (!(is_same<void, typename remove_cv<_Tp>::type>::value), "can't launder cv-void" ); 339 #ifdef _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER 340 return __builtin_launder(__p); 341 #else 342 return __p; 343 #endif 344 } 345 346 347 #if _LIBCPP_STD_VER > 14 348 template <class _Tp> 349 _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY 350 constexpr _Tp* launder(_Tp* __p) noexcept 351 { 352 return _VSTD::__launder(__p); 353 } 354 #endif 355 356 _LIBCPP_END_NAMESPACE_STD 357 358 #endif // _LIBCPP_NEW 359
