1 //===--------------------------- new.cpp ----------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <stdlib.h> 10 11 #include "new" 12 #include "include/atomic_support.h" 13 14 #if defined(_LIBCPP_ABI_MICROSOFT) 15 # if !defined(_LIBCPP_ABI_VCRUNTIME) 16 # include "support/runtime/new_handler_fallback.ipp" 17 # endif 18 #elif defined(LIBCXX_BUILDING_LIBCXXABI) 19 # include <cxxabi.h> 20 #elif defined(LIBCXXRT) 21 # include <cxxabi.h> 22 # include "support/runtime/new_handler_fallback.ipp" 23 #elif defined(__GLIBCXX__) 24 // nothing to do 25 #else 26 # include "support/runtime/new_handler_fallback.ipp" 27 #endif 28 29 namespace std 30 { 31 32 #ifndef __GLIBCXX__ 33 const nothrow_t nothrow{}; 34 #endif 35 36 #ifndef LIBSTDCXX 37 38 void 39 __throw_bad_alloc() 40 { 41 #ifndef _LIBCPP_NO_EXCEPTIONS 42 throw bad_alloc(); 43 #else 44 _VSTD::abort(); 45 #endif 46 } 47 48 #endif // !LIBSTDCXX 49 50 } // std 51 52 #if !defined(__GLIBCXX__) && \ 53 !defined(_LIBCPP_ABI_VCRUNTIME) && \ 54 !defined(_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS) 55 56 // Implement all new and delete operators as weak definitions 57 // in this shared library, so that they can be overridden by programs 58 // that define non-weak copies of the functions. 59 60 _LIBCPP_WEAK 61 void * 62 operator new(std::size_t size) _THROW_BAD_ALLOC 63 { 64 if (size == 0) 65 size = 1; 66 void* p; 67 while ((p = ::malloc(size)) == nullptr) 68 { 69 // If malloc fails and there is a new_handler, 70 // call it to try free up memory. 71 std::new_handler nh = std::get_new_handler(); 72 if (nh) 73 nh(); 74 else 75 #ifndef _LIBCPP_NO_EXCEPTIONS 76 throw std::bad_alloc(); 77 #else 78 break; 79 #endif 80 } 81 return p; 82 } 83 84 _LIBCPP_WEAK 85 void* 86 operator new(size_t size, const std::nothrow_t&) noexcept 87 { 88 void* p = nullptr; 89 #ifndef _LIBCPP_NO_EXCEPTIONS 90 try 91 { 92 #endif // _LIBCPP_NO_EXCEPTIONS 93 p = ::operator new(size); 94 #ifndef _LIBCPP_NO_EXCEPTIONS 95 } 96 catch (...) 97 { 98 } 99 #endif // _LIBCPP_NO_EXCEPTIONS 100 return p; 101 } 102 103 _LIBCPP_WEAK 104 void* 105 operator new[](size_t size) _THROW_BAD_ALLOC 106 { 107 return ::operator new(size); 108 } 109 110 _LIBCPP_WEAK 111 void* 112 operator new[](size_t size, const std::nothrow_t&) noexcept 113 { 114 void* p = nullptr; 115 #ifndef _LIBCPP_NO_EXCEPTIONS 116 try 117 { 118 #endif // _LIBCPP_NO_EXCEPTIONS 119 p = ::operator new[](size); 120 #ifndef _LIBCPP_NO_EXCEPTIONS 121 } 122 catch (...) 123 { 124 } 125 #endif // _LIBCPP_NO_EXCEPTIONS 126 return p; 127 } 128 129 _LIBCPP_WEAK 130 void 131 operator delete(void* ptr) noexcept 132 { 133 ::free(ptr); 134 } 135 136 _LIBCPP_WEAK 137 void 138 operator delete(void* ptr, const std::nothrow_t&) noexcept 139 { 140 ::operator delete(ptr); 141 } 142 143 _LIBCPP_WEAK 144 void 145 operator delete(void* ptr, size_t) noexcept 146 { 147 ::operator delete(ptr); 148 } 149 150 _LIBCPP_WEAK 151 void 152 operator delete[] (void* ptr) noexcept 153 { 154 ::operator delete(ptr); 155 } 156 157 _LIBCPP_WEAK 158 void 159 operator delete[] (void* ptr, const std::nothrow_t&) noexcept 160 { 161 ::operator delete[](ptr); 162 } 163 164 _LIBCPP_WEAK 165 void 166 operator delete[] (void* ptr, size_t) noexcept 167 { 168 ::operator delete[](ptr); 169 } 170 171 #if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) 172 173 _LIBCPP_WEAK 174 void * 175 operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC 176 { 177 if (size == 0) 178 size = 1; 179 if (static_cast<size_t>(alignment) < sizeof(void*)) 180 alignment = std::align_val_t(sizeof(void*)); 181 182 // Try allocating memory. If allocation fails and there is a new_handler, 183 // call it to try free up memory, and try again until it succeeds, or until 184 // the new_handler decides to terminate. 185 // 186 // If allocation fails and there is no new_handler, we throw bad_alloc 187 // (or return nullptr if exceptions are disabled). 188 void* p; 189 while ((p = std::__libcpp_aligned_alloc(static_cast<std::size_t>(alignment), size)) == nullptr) 190 { 191 std::new_handler nh = std::get_new_handler(); 192 if (nh) 193 nh(); 194 else { 195 #ifndef _LIBCPP_NO_EXCEPTIONS 196 throw std::bad_alloc(); 197 #else 198 break; 199 #endif 200 } 201 } 202 return p; 203 } 204 205 _LIBCPP_WEAK 206 void* 207 operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept 208 { 209 void* p = nullptr; 210 #ifndef _LIBCPP_NO_EXCEPTIONS 211 try 212 { 213 #endif // _LIBCPP_NO_EXCEPTIONS 214 p = ::operator new(size, alignment); 215 #ifndef _LIBCPP_NO_EXCEPTIONS 216 } 217 catch (...) 218 { 219 } 220 #endif // _LIBCPP_NO_EXCEPTIONS 221 return p; 222 } 223 224 _LIBCPP_WEAK 225 void* 226 operator new[](size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC 227 { 228 return ::operator new(size, alignment); 229 } 230 231 _LIBCPP_WEAK 232 void* 233 operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) noexcept 234 { 235 void* p = nullptr; 236 #ifndef _LIBCPP_NO_EXCEPTIONS 237 try 238 { 239 #endif // _LIBCPP_NO_EXCEPTIONS 240 p = ::operator new[](size, alignment); 241 #ifndef _LIBCPP_NO_EXCEPTIONS 242 } 243 catch (...) 244 { 245 } 246 #endif // _LIBCPP_NO_EXCEPTIONS 247 return p; 248 } 249 250 _LIBCPP_WEAK 251 void 252 operator delete(void* ptr, std::align_val_t) noexcept 253 { 254 std::__libcpp_aligned_free(ptr); 255 } 256 257 _LIBCPP_WEAK 258 void 259 operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept 260 { 261 ::operator delete(ptr, alignment); 262 } 263 264 _LIBCPP_WEAK 265 void 266 operator delete(void* ptr, size_t, std::align_val_t alignment) noexcept 267 { 268 ::operator delete(ptr, alignment); 269 } 270 271 _LIBCPP_WEAK 272 void 273 operator delete[] (void* ptr, std::align_val_t alignment) noexcept 274 { 275 ::operator delete(ptr, alignment); 276 } 277 278 _LIBCPP_WEAK 279 void 280 operator delete[] (void* ptr, std::align_val_t alignment, const std::nothrow_t&) noexcept 281 { 282 ::operator delete[](ptr, alignment); 283 } 284 285 _LIBCPP_WEAK 286 void 287 operator delete[] (void* ptr, size_t, std::align_val_t alignment) noexcept 288 { 289 ::operator delete[](ptr, alignment); 290 } 291 292 #endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 293 #endif // !__GLIBCXX__ && !_LIBCPP_ABI_VCRUNTIME && !_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS 294