1 // -*- C++ -*- 2 //===-------------------------- exception ---------------------------------===// 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_EXCEPTION 12 #define _LIBCPP_EXCEPTION 13 14 /* 15 exception synopsis 16 17 namespace std 18 { 19 20 class exception 21 { 22 public: 23 exception() noexcept; 24 exception(const exception&) noexcept; 25 exception& operator=(const exception&) noexcept; 26 virtual ~exception() noexcept; 27 virtual const char* what() const noexcept; 28 }; 29 30 class bad_exception 31 : public exception 32 { 33 public: 34 bad_exception() noexcept; 35 bad_exception(const bad_exception&) noexcept; 36 bad_exception& operator=(const bad_exception&) noexcept; 37 virtual ~bad_exception() noexcept; 38 virtual const char* what() const noexcept; 39 }; 40 41 typedef void (*unexpected_handler)(); 42 unexpected_handler set_unexpected(unexpected_handler f ) noexcept; 43 unexpected_handler get_unexpected() noexcept; 44 [[noreturn]] void unexpected(); 45 46 typedef void (*terminate_handler)(); 47 terminate_handler set_terminate(terminate_handler f ) noexcept; 48 terminate_handler get_terminate() noexcept; 49 [[noreturn]] void terminate() noexcept; 50 51 bool uncaught_exception() noexcept; 52 int uncaught_exceptions() noexcept; // C++17 53 54 typedef unspecified exception_ptr; 55 56 exception_ptr current_exception() noexcept; 57 void rethrow_exception [[noreturn]] (exception_ptr p); 58 template<class E> exception_ptr make_exception_ptr(E e) noexcept; 59 60 class nested_exception 61 { 62 public: 63 nested_exception() noexcept; 64 nested_exception(const nested_exception&) noexcept = default; 65 nested_exception& operator=(const nested_exception&) noexcept = default; 66 virtual ~nested_exception() = default; 67 68 // access functions 69 [[noreturn]] void rethrow_nested() const; 70 exception_ptr nested_ptr() const noexcept; 71 }; 72 73 template <class T> [[noreturn]] void throw_with_nested(T&& t); 74 template <class E> void rethrow_if_nested(const E& e); 75 76 } // std 77 78 */ 79 80 #include <__config> 81 #include <cstddef> 82 #include <cstdlib> 83 #include <type_traits> 84 #include <version> 85 86 #if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME) 87 #include <vcruntime_exception.h> 88 #endif 89 90 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 91 #pragma GCC system_header 92 #endif 93 94 namespace std // purposefully not using versioning namespace 95 { 96 97 #if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME) 98 class _LIBCPP_EXCEPTION_ABI exception 99 { 100 public: 101 _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {} 102 virtual ~exception() _NOEXCEPT; 103 virtual const char* what() const _NOEXCEPT; 104 }; 105 106 class _LIBCPP_EXCEPTION_ABI bad_exception 107 : public exception 108 { 109 public: 110 _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {} 111 virtual ~bad_exception() _NOEXCEPT; 112 virtual const char* what() const _NOEXCEPT; 113 }; 114 #endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME 115 116 #if _LIBCPP_STD_VER <= 14 \ 117 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) \ 118 || defined(_LIBCPP_BUILDING_LIBRARY) 119 typedef void (*unexpected_handler)(); 120 _LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT; 121 _LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT; 122 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected(); 123 #endif 124 125 typedef void (*terminate_handler)(); 126 _LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT; 127 _LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT; 128 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT; 129 130 _LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT; 131 _LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT; 132 133 class _LIBCPP_TYPE_VIS exception_ptr; 134 135 _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT; 136 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr); 137 138 #ifndef _LIBCPP_ABI_MICROSOFT 139 140 class _LIBCPP_TYPE_VIS exception_ptr 141 { 142 void* __ptr_; 143 public: 144 _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {} 145 _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {} 146 147 exception_ptr(const exception_ptr&) _NOEXCEPT; 148 exception_ptr& operator=(const exception_ptr&) _NOEXCEPT; 149 ~exception_ptr() _NOEXCEPT; 150 151 _LIBCPP_INLINE_VISIBILITY _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT 152 {return __ptr_ != nullptr;} 153 154 friend _LIBCPP_INLINE_VISIBILITY 155 bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT 156 {return __x.__ptr_ == __y.__ptr_;} 157 158 friend _LIBCPP_INLINE_VISIBILITY 159 bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT 160 {return !(__x == __y);} 161 162 friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT; 163 friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr); 164 }; 165 166 template<class _Ep> 167 _LIBCPP_INLINE_VISIBILITY exception_ptr 168 make_exception_ptr(_Ep __e) _NOEXCEPT 169 { 170 #ifndef _LIBCPP_NO_EXCEPTIONS 171 try 172 { 173 throw __e; 174 } 175 catch (...) 176 { 177 return current_exception(); 178 } 179 #else 180 ((void)__e); 181 _VSTD::abort(); 182 #endif 183 } 184 185 #else // _LIBCPP_ABI_MICROSOFT 186 187 class _LIBCPP_TYPE_VIS exception_ptr 188 { 189 #if defined(__clang__) 190 #pragma clang diagnostic push 191 #pragma clang diagnostic ignored "-Wunused-private-field" 192 #endif 193 void* __ptr1_; 194 void* __ptr2_; 195 #if defined(__clang__) 196 #pragma clang diagnostic pop 197 #endif 198 public: 199 exception_ptr() _NOEXCEPT; 200 exception_ptr(nullptr_t) _NOEXCEPT; 201 exception_ptr(const exception_ptr& __other) _NOEXCEPT; 202 exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT; 203 exception_ptr& operator=(nullptr_t) _NOEXCEPT; 204 ~exception_ptr() _NOEXCEPT; 205 _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT; 206 }; 207 208 _LIBCPP_FUNC_VIS 209 bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT; 210 211 inline _LIBCPP_INLINE_VISIBILITY 212 bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT 213 {return !(__x == __y);} 214 215 _LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT; 216 217 _LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void *__except, const void* __ptr); 218 _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT; 219 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr p); 220 221 // This is a built-in template function which automagically extracts the required 222 // information. 223 template <class _E> void *__GetExceptionInfo(_E); 224 225 template<class _Ep> 226 _LIBCPP_INLINE_VISIBILITY exception_ptr 227 make_exception_ptr(_Ep __e) _NOEXCEPT 228 { 229 return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e)); 230 } 231 232 #endif // _LIBCPP_ABI_MICROSOFT 233 // nested_exception 234 235 class _LIBCPP_EXCEPTION_ABI nested_exception 236 { 237 exception_ptr __ptr_; 238 public: 239 nested_exception() _NOEXCEPT; 240 // nested_exception(const nested_exception&) noexcept = default; 241 // nested_exception& operator=(const nested_exception&) noexcept = default; 242 virtual ~nested_exception() _NOEXCEPT; 243 244 // access functions 245 _LIBCPP_NORETURN void rethrow_nested() const; 246 _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;} 247 }; 248 249 template <class _Tp> 250 struct __nested 251 : public _Tp, 252 public nested_exception 253 { 254 _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {} 255 }; 256 257 #ifndef _LIBCPP_NO_EXCEPTIONS 258 template <class _Tp, class _Up, bool> 259 struct __throw_with_nested; 260 261 template <class _Tp, class _Up> 262 struct __throw_with_nested<_Tp, _Up, true> { 263 _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void 264 #ifndef _LIBCPP_CXX03_LANG 265 __do_throw(_Tp&& __t) 266 #else 267 __do_throw (_Tp& __t) 268 #endif // _LIBCPP_CXX03_LANG 269 { 270 throw __nested<_Up>(_VSTD::forward<_Tp>(__t)); 271 } 272 }; 273 274 template <class _Tp, class _Up> 275 struct __throw_with_nested<_Tp, _Up, false> { 276 _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void 277 #ifndef _LIBCPP_CXX03_LANG 278 __do_throw(_Tp&& __t) 279 #else 280 __do_throw (_Tp& __t) 281 #endif // _LIBCPP_CXX03_LANG 282 { 283 throw _VSTD::forward<_Tp>(__t); 284 } 285 }; 286 #endif 287 288 template <class _Tp> 289 _LIBCPP_NORETURN 290 void 291 #ifndef _LIBCPP_CXX03_LANG 292 throw_with_nested(_Tp&& __t) 293 #else 294 throw_with_nested (_Tp& __t) 295 #endif // _LIBCPP_CXX03_LANG 296 { 297 #ifndef _LIBCPP_NO_EXCEPTIONS 298 typedef typename decay<_Tp>::type _Up; 299 static_assert( is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible"); 300 __throw_with_nested<_Tp, _Up, 301 is_class<_Up>::value && 302 !is_base_of<nested_exception, _Up>::value && 303 !__libcpp_is_final<_Up>::value>:: 304 __do_throw(_VSTD::forward<_Tp>(__t)); 305 #else 306 ((void)__t); 307 // FIXME: Make this abort 308 #endif 309 } 310 311 template <class _From, class _To> 312 struct __can_dynamic_cast : public _LIBCPP_BOOL_CONSTANT( 313 is_polymorphic<_From>::value && 314 (!is_base_of<_To, _From>::value || 315 is_convertible<const _From*, const _To*>::value)) {}; 316 317 template <class _Ep> 318 inline _LIBCPP_INLINE_VISIBILITY 319 void 320 rethrow_if_nested(const _Ep& __e, 321 typename enable_if< __can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0) 322 { 323 const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::addressof(__e)); 324 if (__nep) 325 __nep->rethrow_nested(); 326 } 327 328 template <class _Ep> 329 inline _LIBCPP_INLINE_VISIBILITY 330 void 331 rethrow_if_nested(const _Ep&, 332 typename enable_if<!__can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0) 333 { 334 } 335 336 } // std 337 338 #endif // _LIBCPP_EXCEPTION 339
