1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_NEW 11#define _LIBCPP_NEW 12 13/* 14 new synopsis 15 16namespace std 17{ 18 19class bad_alloc 20 : public exception 21{ 22public: 23 bad_alloc() noexcept; 24 bad_alloc(const bad_alloc&) noexcept; 25 bad_alloc& operator=(const bad_alloc&) noexcept; 26 virtual const char* what() const noexcept; 27}; 28 29class bad_array_new_length : public bad_alloc // C++14 30{ 31public: 32 bad_array_new_length() noexcept; 33}; 34 35enum class align_val_t : size_t {}; // C++17 36 37struct destroying_delete_t { // C++20 38 explicit destroying_delete_t() = default; 39}; 40inline constexpr destroying_delete_t destroying_delete{}; // C++20 41 42struct nothrow_t { explicit nothrow_t() = default; }; 43extern const nothrow_t nothrow; 44typedef void (*new_handler)(); 45new_handler set_new_handler(new_handler new_p) noexcept; 46new_handler get_new_handler() noexcept; 47 48// 21.6.4, pointer optimization barrier 49template <class T> [[nodiscard]] constexpr T* launder(T* p) noexcept; // C++17, nodiscard since C++20 50} // std 51 52void* operator new(std::size_t size); // replaceable, nodiscard in C++20 53void* operator new(std::size_t size, std::align_val_t alignment); // replaceable, C++17, nodiscard in C++20 54void* operator new(std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20 55void* operator new(std::size_t size, std::align_val_t alignment, 56 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++20 57void operator delete(void* ptr) noexcept; // replaceable 58void operator delete(void* ptr, std::size_t size) noexcept; // replaceable, C++14 59void operator delete(void* ptr, std::align_val_t alignment) noexcept; // replaceable, C++17 60void operator delete(void* ptr, std::size_t size, 61 std::align_val_t alignment) noexcept; // replaceable, C++17 62void operator delete(void* ptr, const std::nothrow_t&) noexcept; // replaceable 63void operator delete(void* ptr, std:align_val_t alignment, 64 const std::nothrow_t&) noexcept; // replaceable, C++17 65 66void* operator new[](std::size_t size); // replaceable, nodiscard in C++20 67void* operator new[](std::size_t size, 68 std::align_val_t alignment) noexcept; // replaceable, C++17, nodiscard in C++20 69void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20 70void* operator new[](std::size_t size, std::align_val_t alignment, 71 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++20 72void operator delete[](void* ptr) noexcept; // replaceable 73void operator delete[](void* ptr, std::size_t size) noexcept; // replaceable, C++14 74void operator delete[](void* ptr, 75 std::align_val_t alignment) noexcept; // replaceable, C++17 76void operator delete[](void* ptr, std::size_t size, 77 std::align_val_t alignment) noexcept; // replaceable, C++17 78void operator delete[](void* ptr, const std::nothrow_t&) noexcept; // replaceable 79void operator delete[](void* ptr, std::align_val_t alignment, 80 const std::nothrow_t&) noexcept; // replaceable, C++17 81 82void* operator new (std::size_t size, void* ptr) noexcept; // nodiscard in C++20 83void* operator new[](std::size_t size, void* ptr) noexcept; // nodiscard in C++20 84void operator delete (void* ptr, void*) noexcept; 85void operator delete[](void* ptr, void*) noexcept; 86 87*/ 88 89#include <__assert> // all public C++ headers provide the assertion handler 90#include <__availability> 91#include <__config> 92#include <__exception/exception.h> 93#include <__type_traits/is_function.h> 94#include <__type_traits/is_same.h> 95#include <__type_traits/remove_cv.h> 96#include <cstddef> 97#include <version> 98 99#if defined(_LIBCPP_ABI_VCRUNTIME) 100#include <new.h> 101#endif 102 103#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 104# pragma GCC system_header 105#endif 106 107#if !defined(__cpp_sized_deallocation) || __cpp_sized_deallocation < 201309L 108#define _LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION 109#endif 110 111#if !defined(_LIBCPP_BUILDING_LIBRARY) && _LIBCPP_STD_VER < 14 && \ 112 defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 113# define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 114#endif 115 116#if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || \ 117 defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 118# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION 119#endif 120 121namespace std // purposefully not using versioning namespace 122{ 123 124#if !defined(_LIBCPP_ABI_VCRUNTIME) 125struct _LIBCPP_EXPORTED_FROM_ABI nothrow_t { explicit nothrow_t() = default; }; 126extern _LIBCPP_EXPORTED_FROM_ABI const nothrow_t nothrow; 127 128class _LIBCPP_EXPORTED_FROM_ABI bad_alloc 129 : public exception 130{ 131public: 132 bad_alloc() _NOEXCEPT; 133 _LIBCPP_HIDE_FROM_ABI bad_alloc(const bad_alloc&) _NOEXCEPT = default; 134 _LIBCPP_HIDE_FROM_ABI bad_alloc& operator=(const bad_alloc&) _NOEXCEPT = default; 135 ~bad_alloc() _NOEXCEPT override; 136 const char* what() const _NOEXCEPT override; 137}; 138 139class _LIBCPP_EXPORTED_FROM_ABI bad_array_new_length 140 : public bad_alloc 141{ 142public: 143 bad_array_new_length() _NOEXCEPT; 144 _LIBCPP_HIDE_FROM_ABI bad_array_new_length(const bad_array_new_length&) _NOEXCEPT = default; 145 _LIBCPP_HIDE_FROM_ABI bad_array_new_length& operator=(const bad_array_new_length&) _NOEXCEPT = default; 146 ~bad_array_new_length() _NOEXCEPT override; 147 const char* what() const _NOEXCEPT override; 148}; 149 150typedef void (*new_handler)(); 151_LIBCPP_EXPORTED_FROM_ABI new_handler set_new_handler(new_handler) _NOEXCEPT; 152_LIBCPP_EXPORTED_FROM_ABI new_handler get_new_handler() _NOEXCEPT; 153 154#elif defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 // !_LIBCPP_ABI_VCRUNTIME 155 156// When _HAS_EXCEPTIONS == 0, these complete definitions are needed, 157// since they would normally be provided in vcruntime_exception.h 158class bad_alloc : public exception { 159public: 160 bad_alloc() noexcept : exception("bad allocation") {} 161 162private: 163 friend class bad_array_new_length; 164 165 bad_alloc(char const* const __message) noexcept : exception(__message) {} 166}; 167 168class bad_array_new_length : public bad_alloc { 169public: 170 bad_array_new_length() noexcept : bad_alloc("bad array new length") {} 171}; 172#endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 173 174_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec 175 176_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI 177void __throw_bad_array_new_length() 178{ 179#ifndef _LIBCPP_HAS_NO_EXCEPTIONS 180 throw bad_array_new_length(); 181#else 182 _LIBCPP_VERBOSE_ABORT("bad_array_new_length was thrown in -fno-exceptions mode"); 183#endif 184} 185 186#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && \ 187 !defined(_LIBCPP_ABI_VCRUNTIME) 188#ifndef _LIBCPP_CXX03_LANG 189enum class align_val_t : size_t { }; 190#else 191enum align_val_t { __zero = 0, __max = (size_t)-1 }; 192#endif 193#endif 194 195#if _LIBCPP_STD_VER >= 20 196// Enable the declaration even if the compiler doesn't support the language 197// feature. 198struct destroying_delete_t { 199 explicit destroying_delete_t() = default; 200}; 201inline constexpr destroying_delete_t destroying_delete{}; 202#endif // _LIBCPP_STD_VER >= 20 203 204} // namespace std 205 206#if defined(_LIBCPP_CXX03_LANG) 207#define _THROW_BAD_ALLOC throw(std::bad_alloc) 208#else 209#define _THROW_BAD_ALLOC 210#endif 211 212#if !defined(_LIBCPP_ABI_VCRUNTIME) 213 214_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC; 215_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 216_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; 217_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT; 218#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 219_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz) _NOEXCEPT; 220#endif 221 222_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC; 223_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 224_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT; 225_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT; 226#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 227_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT; 228#endif 229 230#ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 231_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 232_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 233_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT; 234_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 235#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 236_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 237#endif 238 239_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 240_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 241_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT; 242_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 243#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 244_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 245#endif 246#endif 247 248_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI void* operator new (std::size_t, void* __p) _NOEXCEPT {return __p;} 249_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;} 250inline _LIBCPP_HIDE_FROM_ABI void operator delete (void*, void*) _NOEXCEPT {} 251inline _LIBCPP_HIDE_FROM_ABI void operator delete[](void*, void*) _NOEXCEPT {} 252 253#endif // !_LIBCPP_ABI_VCRUNTIME 254 255_LIBCPP_BEGIN_NAMESPACE_STD 256 257_LIBCPP_CONSTEXPR inline _LIBCPP_HIDE_FROM_ABI bool __is_overaligned_for_new(size_t __align) _NOEXCEPT { 258#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__ 259 return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__; 260#else 261 return __align > _LIBCPP_ALIGNOF(max_align_t); 262#endif 263} 264 265template <class ..._Args> 266_LIBCPP_HIDE_FROM_ABI 267void* __libcpp_operator_new(_Args ...__args) { 268#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 269 return __builtin_operator_new(__args...); 270#else 271 return ::operator new(__args...); 272#endif 273} 274 275template <class ..._Args> 276_LIBCPP_HIDE_FROM_ABI 277void __libcpp_operator_delete(_Args ...__args) { 278#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 279 __builtin_operator_delete(__args...); 280#else 281 ::operator delete(__args...); 282#endif 283} 284 285inline _LIBCPP_HIDE_FROM_ABI 286void *__libcpp_allocate(size_t __size, size_t __align) { 287#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 288 if (__is_overaligned_for_new(__align)) { 289 const align_val_t __align_val = static_cast<align_val_t>(__align); 290 return __libcpp_operator_new(__size, __align_val); 291 } 292#endif 293 294 (void)__align; 295 return __libcpp_operator_new(__size); 296} 297 298template <class ..._Args> 299_LIBCPP_HIDE_FROM_ABI 300void __do_deallocate_handle_size(void *__ptr, size_t __size, _Args ...__args) { 301#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 302 (void)__size; 303 return std::__libcpp_operator_delete(__ptr, __args...); 304#else 305 return std::__libcpp_operator_delete(__ptr, __size, __args...); 306#endif 307} 308 309inline _LIBCPP_HIDE_FROM_ABI 310void __libcpp_deallocate(void* __ptr, size_t __size, size_t __align) { 311#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 312 (void)__align; 313 return __do_deallocate_handle_size(__ptr, __size); 314#else 315 if (__is_overaligned_for_new(__align)) { 316 const align_val_t __align_val = static_cast<align_val_t>(__align); 317 return __do_deallocate_handle_size(__ptr, __size, __align_val); 318 } else { 319 return __do_deallocate_handle_size(__ptr, __size); 320 } 321#endif 322} 323 324inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate_unsized(void* __ptr, size_t __align) { 325#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 326 (void)__align; 327 return __libcpp_operator_delete(__ptr); 328#else 329 if (__is_overaligned_for_new(__align)) { 330 const align_val_t __align_val = static_cast<align_val_t>(__align); 331 return __libcpp_operator_delete(__ptr, __align_val); 332 } else { 333 return __libcpp_operator_delete(__ptr); 334 } 335#endif 336} 337 338template <class _Tp> 339_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI 340_LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT 341{ 342 static_assert (!(is_function<_Tp>::value), "can't launder functions" ); 343 static_assert (!(is_same<void, __remove_cv_t<_Tp> >::value), "can't launder cv-void" ); 344 return __builtin_launder(__p); 345} 346 347#if _LIBCPP_STD_VER >= 17 348template <class _Tp> 349_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI 350constexpr _Tp* launder(_Tp* __p) noexcept 351{ 352 return std::__launder(__p); 353} 354#endif 355 356#if _LIBCPP_STD_VER >= 17 357 358#if defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE) 359 360inline constexpr size_t hardware_destructive_interference_size = __GCC_DESTRUCTIVE_SIZE; 361inline constexpr size_t hardware_constructive_interference_size = __GCC_CONSTRUCTIVE_SIZE; 362 363#endif // defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE) 364 365#endif // _LIBCPP_STD_VER >= 17 366 367_LIBCPP_END_NAMESPACE_STD 368 369#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 370# include <cstdlib> 371# include <exception> 372# include <type_traits> 373#endif 374 375#endif // _LIBCPP_NEW 376