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 17namespace std 18{ 19 20class bad_alloc 21 : public exception 22{ 23public: 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 30class bad_array_length : public bad_alloc // FIXME: Not part of C++ 31{ 32public: 33 bad_array_length() noexcept; 34}; 35 36class bad_array_new_length : public bad_alloc // C++14 37{ 38public: 39 bad_array_new_length() noexcept; 40}; 41 42enum class align_val_t : size_t {}; // C++17 43struct nothrow_t {}; 44extern const nothrow_t nothrow; 45typedef void (*new_handler)(); 46new_handler set_new_handler(new_handler new_p) noexcept; 47new_handler get_new_handler() noexcept; 48 49// 21.6.4, pointer optimization barrier 50template <class T> constexpr T* launder(T* p) noexcept; // C++17 51} // std 52 53void* operator new(std::size_t size); // replaceable, nodiscard in C++2a 54void* operator new(std::size_t size, std::align_val_t alignment); // replaceable, C++17, nodiscard in C++2a 55void* operator new(std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a 56void* operator new(std::size_t size, std::align_val_t alignment, 57 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++2a 58void operator delete(void* ptr) noexcept; // replaceable 59void operator delete(void* ptr, std::size_t size) noexcept; // replaceable, C++14 60void operator delete(void* ptr, std::align_val_t alignment) noexcept; // replaceable, C++17 61void operator delete(void* ptr, std::size_t size, 62 std::align_val_t alignment) noexcept; // replaceable, C++17 63void operator delete(void* ptr, const std::nothrow_t&) noexcept; // replaceable 64void operator delete(void* ptr, std:align_val_t alignment, 65 const std::nothrow_t&) noexcept; // replaceable, C++17 66 67void* operator new[](std::size_t size); // replaceable, nodiscard in C++2a 68void* operator new[](std::size_t size, 69 std::align_val_t alignment) noexcept; // replaceable, C++17, nodiscard in C++2a 70void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++2a 71void* operator new[](std::size_t size, std::align_val_t alignment, 72 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++2a 73void operator delete[](void* ptr) noexcept; // replaceable 74void operator delete[](void* ptr, std::size_t size) noexcept; // replaceable, C++14 75void operator delete[](void* ptr, 76 std::align_val_t alignment) noexcept; // replaceable, C++17 77void operator delete[](void* ptr, std::size_t size, 78 std::align_val_t alignment) noexcept; // replaceable, C++17 79void operator delete[](void* ptr, const std::nothrow_t&) noexcept; // replaceable 80void operator delete[](void* ptr, std::align_val_t alignment, 81 const std::nothrow_t&) noexcept; // replaceable, C++17 82 83void* operator new (std::size_t size, void* ptr) noexcept; // nodiscard in C++2a 84void* operator new[](std::size_t size, void* ptr) noexcept; // nodiscard in C++2a 85void operator delete (void* ptr, void*) noexcept; 86void operator delete[](void* ptr, void*) noexcept; 87 88*/ 89 90#include <__config> 91#include <exception> 92#include <cstddef> 93#ifdef _LIBCPP_NO_EXCEPTIONS 94#include <cstdlib> 95#endif 96 97#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 98#include <new.h> 99#endif 100 101#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 102#pragma GCC system_header 103#endif 104 105#if !(defined(_LIBCPP_BUILDING_NEW) || _LIBCPP_STD_VER >= 14 || \ 106 (defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309)) 107# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION 108#endif 109 110#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) && \ 111 (!(defined(_LIBCPP_BUILDING_NEW) || _LIBCPP_STD_VER > 14 || \ 112 (defined(__cpp_aligned_new) && __cpp_aligned_new >= 201606))) 113# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 114#endif 115 116namespace std // purposefully not using versioning namespace 117{ 118 119#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME) 120struct _LIBCPP_TYPE_VIS nothrow_t {}; 121extern _LIBCPP_FUNC_VIS const nothrow_t nothrow; 122 123class _LIBCPP_EXCEPTION_ABI bad_alloc 124 : public exception 125{ 126public: 127 bad_alloc() _NOEXCEPT; 128 virtual ~bad_alloc() _NOEXCEPT; 129 virtual const char* what() const _NOEXCEPT; 130}; 131 132class _LIBCPP_EXCEPTION_ABI bad_array_new_length 133 : public bad_alloc 134{ 135public: 136 bad_array_new_length() _NOEXCEPT; 137 virtual ~bad_array_new_length() _NOEXCEPT; 138 virtual const char* what() const _NOEXCEPT; 139}; 140 141typedef void (*new_handler)(); 142_LIBCPP_FUNC_VIS new_handler set_new_handler(new_handler) _NOEXCEPT; 143_LIBCPP_FUNC_VIS new_handler get_new_handler() _NOEXCEPT; 144 145#endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME 146 147_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void __throw_bad_alloc(); // not in C++ spec 148 149#if defined(_LIBCPP_BUILDING_LIBRARY) || (_LIBCPP_STD_VER > 11) 150 151class _LIBCPP_EXCEPTION_ABI _LIBCPP_AVAILABILITY_BAD_ARRAY_LENGTH 152 bad_array_length : public bad_alloc { 153public: 154 bad_array_length() _NOEXCEPT; 155 virtual ~bad_array_length() _NOEXCEPT; 156 virtual const char* what() const _NOEXCEPT; 157}; 158 159#define _LIBCPP_BAD_ARRAY_LENGTH_DEFINED 160 161#endif // defined(_LIBCPP_BUILDING_NEW) || (_LIBCPP_STD_VER > 11) 162 163#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) || _LIBCPP_STD_VER > 14 164#ifndef _LIBCPP_CXX03_LANG 165enum class _LIBCPP_ENUM_VIS align_val_t : size_t { }; 166#else 167enum align_val_t { __zero = 0, __max = (size_t)-1 }; 168#endif 169#endif 170 171} // std 172 173#if defined(_LIBCPP_CXX03_LANG) 174#define _THROW_BAD_ALLOC throw(std::bad_alloc) 175#else 176#define _THROW_BAD_ALLOC 177#endif 178 179#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME) 180 181_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC; 182_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS; 183_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; 184_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT; 185#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 186_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz) _NOEXCEPT; 187#endif 188 189_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC; 190_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _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_SIZED_DEALLOCATION 194_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT; 195#endif 196 197#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 198_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 199_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; 200_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT; 201_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 202#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 203_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 204#endif 205 206_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 207_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; 208_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT; 209_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 210#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 211_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 212#endif 213#endif 214 215_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new (std::size_t, void* __p) _NOEXCEPT {return __p;} 216_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;} 217inline _LIBCPP_INLINE_VISIBILITY void operator delete (void*, void*) _NOEXCEPT {} 218inline _LIBCPP_INLINE_VISIBILITY void operator delete[](void*, void*) _NOEXCEPT {} 219 220#endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME 221 222_LIBCPP_BEGIN_NAMESPACE_STD 223 224inline _LIBCPP_INLINE_VISIBILITY void *__allocate(size_t __size) { 225#ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE 226 return ::operator new(__size); 227#else 228 return __builtin_operator_new(__size); 229#endif 230} 231 232inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate(void *__ptr) { 233#ifdef _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE 234 ::operator delete(__ptr); 235#else 236 __builtin_operator_delete(__ptr); 237#endif 238} 239 240#ifdef _LIBCPP_BAD_ARRAY_LENGTH_DEFINED 241_LIBCPP_NORETURN inline _LIBCPP_ALWAYS_INLINE 242#ifndef _LIBCPP_NO_EXCEPTIONS 243_LIBCPP_AVAILABILITY_BAD_ARRAY_LENGTH 244#endif 245void __throw_bad_array_length() 246{ 247#ifndef _LIBCPP_NO_EXCEPTIONS 248 throw bad_array_length(); 249#else 250 _VSTD::abort(); 251#endif 252} 253#endif 254 255template <class _Tp> 256_LIBCPP_NODISCARD_AFTER_CXX17 inline 257_LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT 258{ 259 static_assert (!(is_function<_Tp>::value), "can't launder functions" ); 260 static_assert (!(is_same<void, typename remove_cv<_Tp>::type>::value), "can't launder cv-void" ); 261#ifdef _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER 262 return __builtin_launder(__p); 263#else 264 return __p; 265#endif 266} 267 268 269#if _LIBCPP_STD_VER > 14 270template <class _Tp> 271_LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY 272constexpr _Tp* launder(_Tp* __p) noexcept 273{ 274 return _VSTD::__launder(__p); 275} 276#endif 277 278_LIBCPP_END_NAMESPACE_STD 279 280#endif // _LIBCPP_NEW 281