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___CXX03_NEW 11#define _LIBCPP___CXX03_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 <__cxx03/__config> 90#include <__cxx03/__exception/exception.h> 91#include <__cxx03/__type_traits/is_function.h> 92#include <__cxx03/__type_traits/is_same.h> 93#include <__cxx03/__type_traits/remove_cv.h> 94#include <__cxx03/__verbose_abort> 95#include <__cxx03/cstddef> 96#include <__cxx03/version> 97 98#if defined(_LIBCPP_ABI_VCRUNTIME) 99# include <__cxx03/new.h> 100#endif 101 102#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 103# pragma GCC system_header 104#endif 105 106#if !defined(__cpp_sized_deallocation) || __cpp_sized_deallocation < 201309L 107# define _LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION 108#endif 109 110#if !defined(_LIBCPP_BUILDING_LIBRARY) && defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 111# define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 112#endif 113 114#if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 115# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION 116#endif 117 118namespace std // purposefully not using versioning namespace 119{ 120 121#if !defined(_LIBCPP_ABI_VCRUNTIME) 122struct _LIBCPP_EXPORTED_FROM_ABI nothrow_t { 123 explicit nothrow_t() = default; 124}; 125extern _LIBCPP_EXPORTED_FROM_ABI const nothrow_t nothrow; 126 127class _LIBCPP_EXPORTED_FROM_ABI bad_alloc : public exception { 128public: 129 bad_alloc() _NOEXCEPT; 130 _LIBCPP_HIDE_FROM_ABI bad_alloc(const bad_alloc&) _NOEXCEPT = default; 131 _LIBCPP_HIDE_FROM_ABI bad_alloc& operator=(const bad_alloc&) _NOEXCEPT = default; 132 ~bad_alloc() _NOEXCEPT override; 133 const char* what() const _NOEXCEPT override; 134}; 135 136class _LIBCPP_EXPORTED_FROM_ABI bad_array_new_length : public bad_alloc { 137public: 138 bad_array_new_length() _NOEXCEPT; 139 _LIBCPP_HIDE_FROM_ABI bad_array_new_length(const bad_array_new_length&) _NOEXCEPT = default; 140 _LIBCPP_HIDE_FROM_ABI bad_array_new_length& operator=(const bad_array_new_length&) _NOEXCEPT = default; 141 ~bad_array_new_length() _NOEXCEPT override; 142 const char* what() const _NOEXCEPT override; 143}; 144 145typedef void (*new_handler)(); 146_LIBCPP_EXPORTED_FROM_ABI new_handler set_new_handler(new_handler) _NOEXCEPT; 147_LIBCPP_EXPORTED_FROM_ABI new_handler get_new_handler() _NOEXCEPT; 148 149#elif defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 // !_LIBCPP_ABI_VCRUNTIME 150 151// When _HAS_EXCEPTIONS == 0, these complete definitions are needed, 152// since they would normally be provided in vcruntime_exception.h 153class bad_alloc : public exception { 154public: 155 bad_alloc() noexcept : exception("bad allocation") {} 156 157private: 158 friend class bad_array_new_length; 159 160 bad_alloc(char const* const __message) noexcept : exception(__message) {} 161}; 162 163class bad_array_new_length : public bad_alloc { 164public: 165 bad_array_new_length() noexcept : bad_alloc("bad array new length") {} 166}; 167#endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 168 169_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec 170 171_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_array_new_length() { 172#ifndef _LIBCPP_HAS_NO_EXCEPTIONS 173 throw bad_array_new_length(); 174#else 175 _LIBCPP_VERBOSE_ABORT("bad_array_new_length was thrown in -fno-exceptions mode"); 176#endif 177} 178 179#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && !defined(_LIBCPP_ABI_VCRUNTIME) 180enum align_val_t { __zero = 0, __max = (size_t)-1 }; 181#endif 182} // namespace std 183 184#define _THROW_BAD_ALLOC throw(std::bad_alloc) 185 186#if !defined(_LIBCPP_ABI_VCRUNTIME) 187 188_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC; 189_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT 190 _LIBCPP_NOALIAS; 191_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; 192_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT; 193# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 194_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz) _NOEXCEPT; 195# endif 196 197_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC; 198_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT 199 _LIBCPP_NOALIAS; 200_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT; 201_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT; 202# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 203_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT; 204# endif 205 206# ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 207_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 208_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 209operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 210_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT; 211_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, 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, std::align_val_t) _NOEXCEPT; 214# endif 215 216_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 217operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 218_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 219operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 220_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT; 221_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 222# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 223_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 224# endif 225# endif 226 227_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI void* operator new(std::size_t, void* __p) _NOEXCEPT { return __p; } 228_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI void* operator new[](std::size_t, void* __p) _NOEXCEPT { return __p; } 229inline _LIBCPP_HIDE_FROM_ABI void operator delete(void*, void*) _NOEXCEPT {} 230inline _LIBCPP_HIDE_FROM_ABI void operator delete[](void*, void*) _NOEXCEPT {} 231 232#endif // !_LIBCPP_ABI_VCRUNTIME 233 234_LIBCPP_BEGIN_NAMESPACE_STD 235 236inline _LIBCPP_HIDE_FROM_ABI bool __is_overaligned_for_new(size_t __align) _NOEXCEPT { 237#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__ 238 return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__; 239#else 240 return __align > _LIBCPP_ALIGNOF(max_align_t); 241#endif 242} 243 244template <class... _Args> 245_LIBCPP_HIDE_FROM_ABI void* __libcpp_operator_new(_Args... __args) { 246#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 247 return __builtin_operator_new(__args...); 248#else 249 return ::operator new(__args...); 250#endif 251} 252 253template <class... _Args> 254_LIBCPP_HIDE_FROM_ABI void __libcpp_operator_delete(_Args... __args) { 255#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 256 __builtin_operator_delete(__args...); 257#else 258 ::operator delete(__args...); 259#endif 260} 261 262inline _LIBCPP_HIDE_FROM_ABI void* __libcpp_allocate(size_t __size, size_t __align) { 263#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 264 if (__is_overaligned_for_new(__align)) { 265 const align_val_t __align_val = static_cast<align_val_t>(__align); 266 return __libcpp_operator_new(__size, __align_val); 267 } 268#endif 269 270 (void)__align; 271 return __libcpp_operator_new(__size); 272} 273 274template <class... _Args> 275_LIBCPP_HIDE_FROM_ABI void __do_deallocate_handle_size(void* __ptr, size_t __size, _Args... __args) { 276#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 277 (void)__size; 278 return std::__libcpp_operator_delete(__ptr, __args...); 279#else 280 return std::__libcpp_operator_delete(__ptr, __size, __args...); 281#endif 282} 283 284inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate(void* __ptr, size_t __size, size_t __align) { 285#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 286 (void)__align; 287 return __do_deallocate_handle_size(__ptr, __size); 288#else 289 if (__is_overaligned_for_new(__align)) { 290 const align_val_t __align_val = static_cast<align_val_t>(__align); 291 return __do_deallocate_handle_size(__ptr, __size, __align_val); 292 } else { 293 return __do_deallocate_handle_size(__ptr, __size); 294 } 295#endif 296} 297 298inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate_unsized(void* __ptr, size_t __align) { 299#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 300 (void)__align; 301 return __libcpp_operator_delete(__ptr); 302#else 303 if (__is_overaligned_for_new(__align)) { 304 const align_val_t __align_val = static_cast<align_val_t>(__align); 305 return __libcpp_operator_delete(__ptr, __align_val); 306 } else { 307 return __libcpp_operator_delete(__ptr); 308 } 309#endif 310} 311 312template <class _Tp> 313_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _Tp* __launder(_Tp* __p) _NOEXCEPT { 314 static_assert(!(is_function<_Tp>::value), "can't launder functions"); 315 static_assert(!(is_same<void, __remove_cv_t<_Tp> >::value), "can't launder cv-void"); 316 return __builtin_launder(__p); 317} 318 319_LIBCPP_END_NAMESPACE_STD 320 321#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) 322# include <__cxx03/cstdlib> 323# include <__cxx03/type_traits> 324#endif 325 326#endif // _LIBCPP___CXX03_NEW 327