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 && defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 112# define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 113#endif 114 115#if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 116# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION 117#endif 118 119namespace std // purposefully not using versioning namespace 120{ 121 122#if !defined(_LIBCPP_ABI_VCRUNTIME) 123struct _LIBCPP_EXPORTED_FROM_ABI nothrow_t { 124 explicit nothrow_t() = default; 125}; 126extern _LIBCPP_EXPORTED_FROM_ABI const nothrow_t nothrow; 127 128class _LIBCPP_EXPORTED_FROM_ABI bad_alloc : public exception { 129public: 130 bad_alloc() _NOEXCEPT; 131 _LIBCPP_HIDE_FROM_ABI bad_alloc(const bad_alloc&) _NOEXCEPT = default; 132 _LIBCPP_HIDE_FROM_ABI bad_alloc& operator=(const bad_alloc&) _NOEXCEPT = default; 133 ~bad_alloc() _NOEXCEPT override; 134 const char* what() const _NOEXCEPT override; 135}; 136 137class _LIBCPP_EXPORTED_FROM_ABI bad_array_new_length : public bad_alloc { 138public: 139 bad_array_new_length() _NOEXCEPT; 140 _LIBCPP_HIDE_FROM_ABI bad_array_new_length(const bad_array_new_length&) _NOEXCEPT = default; 141 _LIBCPP_HIDE_FROM_ABI bad_array_new_length& operator=(const bad_array_new_length&) _NOEXCEPT = default; 142 ~bad_array_new_length() _NOEXCEPT override; 143 const char* what() const _NOEXCEPT override; 144}; 145 146typedef void (*new_handler)(); 147_LIBCPP_EXPORTED_FROM_ABI new_handler set_new_handler(new_handler) _NOEXCEPT; 148_LIBCPP_EXPORTED_FROM_ABI new_handler get_new_handler() _NOEXCEPT; 149 150#elif defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 // !_LIBCPP_ABI_VCRUNTIME 151 152// When _HAS_EXCEPTIONS == 0, these complete definitions are needed, 153// since they would normally be provided in vcruntime_exception.h 154class bad_alloc : public exception { 155public: 156 bad_alloc() noexcept : exception("bad allocation") {} 157 158private: 159 friend class bad_array_new_length; 160 161 bad_alloc(char const* const __message) noexcept : exception(__message) {} 162}; 163 164class bad_array_new_length : public bad_alloc { 165public: 166 bad_array_new_length() noexcept : bad_alloc("bad array new length") {} 167}; 168#endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 169 170_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec 171 172_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_array_new_length() { 173#ifndef _LIBCPP_HAS_NO_EXCEPTIONS 174 throw bad_array_new_length(); 175#else 176 _LIBCPP_VERBOSE_ABORT("bad_array_new_length was thrown in -fno-exceptions mode"); 177#endif 178} 179 180#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && !defined(_LIBCPP_ABI_VCRUNTIME) 181# ifndef _LIBCPP_CXX03_LANG 182enum class align_val_t : size_t {}; 183# else 184enum align_val_t { __zero = 0, __max = (size_t)-1 }; 185# endif 186#endif 187 188#if _LIBCPP_STD_VER >= 20 189// Enable the declaration even if the compiler doesn't support the language 190// feature. 191struct destroying_delete_t { 192 explicit destroying_delete_t() = default; 193}; 194inline constexpr destroying_delete_t destroying_delete{}; 195#endif // _LIBCPP_STD_VER >= 20 196 197} // namespace std 198 199#if defined(_LIBCPP_CXX03_LANG) 200# define _THROW_BAD_ALLOC throw(std::bad_alloc) 201#else 202# define _THROW_BAD_ALLOC 203#endif 204 205#if !defined(_LIBCPP_ABI_VCRUNTIME) 206 207_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC; 208_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* 209operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 210_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; 211_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT; 212# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 213_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz) _NOEXCEPT; 214# endif 215 216_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC; 217_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* 218operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 219_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT; 220_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT; 221# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 222_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT; 223# endif 224 225# ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 226_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* 227operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 228_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* 229operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 230_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT; 231_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 232# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 233_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 234# endif 235 236_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* 237operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 238_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* 239operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 240_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT; 241_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 242# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 243_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 244# endif 245# endif 246 247_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI void* operator new(std::size_t, void* __p) _NOEXCEPT { 248 return __p; 249} 250_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI void* operator new[](std::size_t, void* __p) _NOEXCEPT { 251 return __p; 252} 253inline _LIBCPP_HIDE_FROM_ABI void operator delete(void*, void*) _NOEXCEPT {} 254inline _LIBCPP_HIDE_FROM_ABI void operator delete[](void*, void*) _NOEXCEPT {} 255 256#endif // !_LIBCPP_ABI_VCRUNTIME 257 258_LIBCPP_BEGIN_NAMESPACE_STD 259 260_LIBCPP_CONSTEXPR inline _LIBCPP_HIDE_FROM_ABI bool __is_overaligned_for_new(size_t __align) _NOEXCEPT { 261#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__ 262 return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__; 263#else 264 return __align > _LIBCPP_ALIGNOF(max_align_t); 265#endif 266} 267 268template <class... _Args> 269_LIBCPP_HIDE_FROM_ABI void* __libcpp_operator_new(_Args... __args) { 270#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 271 return __builtin_operator_new(__args...); 272#else 273 return ::operator new(__args...); 274#endif 275} 276 277template <class... _Args> 278_LIBCPP_HIDE_FROM_ABI void __libcpp_operator_delete(_Args... __args) { 279#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 280 __builtin_operator_delete(__args...); 281#else 282 ::operator delete(__args...); 283#endif 284} 285 286inline _LIBCPP_HIDE_FROM_ABI void* __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 void __do_deallocate_handle_size(void* __ptr, size_t __size, _Args... __args) { 300#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 301 (void)__size; 302 return std::__libcpp_operator_delete(__ptr, __args...); 303#else 304 return std::__libcpp_operator_delete(__ptr, __size, __args...); 305#endif 306} 307 308inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate(void* __ptr, size_t __size, size_t __align) { 309#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 310 (void)__align; 311 return __do_deallocate_handle_size(__ptr, __size); 312#else 313 if (__is_overaligned_for_new(__align)) { 314 const align_val_t __align_val = static_cast<align_val_t>(__align); 315 return __do_deallocate_handle_size(__ptr, __size, __align_val); 316 } else { 317 return __do_deallocate_handle_size(__ptr, __size); 318 } 319#endif 320} 321 322inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate_unsized(void* __ptr, size_t __align) { 323#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 324 (void)__align; 325 return __libcpp_operator_delete(__ptr); 326#else 327 if (__is_overaligned_for_new(__align)) { 328 const align_val_t __align_val = static_cast<align_val_t>(__align); 329 return __libcpp_operator_delete(__ptr, __align_val); 330 } else { 331 return __libcpp_operator_delete(__ptr); 332 } 333#endif 334} 335 336template <class _Tp> 337_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT { 338 static_assert(!(is_function<_Tp>::value), "can't launder functions"); 339 static_assert(!(is_same<void, __remove_cv_t<_Tp> >::value), "can't launder cv-void"); 340 return __builtin_launder(__p); 341} 342 343#if _LIBCPP_STD_VER >= 17 344template <class _Tp> 345_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp* launder(_Tp* __p) noexcept { 346 return std::__launder(__p); 347} 348#endif 349 350#if _LIBCPP_STD_VER >= 17 351 352# if defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE) 353 354inline constexpr size_t hardware_destructive_interference_size = __GCC_DESTRUCTIVE_SIZE; 355inline constexpr size_t hardware_constructive_interference_size = __GCC_CONSTRUCTIVE_SIZE; 356 357# endif // defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE) 358 359#endif // _LIBCPP_STD_VER >= 17 360 361_LIBCPP_END_NAMESPACE_STD 362 363#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 364# include <cstdlib> 365# include <exception> 366# include <type_traits> 367#endif 368 369#endif // _LIBCPP_NEW 370