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 17namespace std 18{ 19 20class exception 21{ 22public: 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 30class bad_exception 31 : public exception 32{ 33public: 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 41typedef void (*unexpected_handler)(); 42unexpected_handler set_unexpected(unexpected_handler f ) noexcept; 43unexpected_handler get_unexpected() noexcept; 44[[noreturn]] void unexpected(); 45 46typedef void (*terminate_handler)(); 47terminate_handler set_terminate(terminate_handler f ) noexcept; 48terminate_handler get_terminate() noexcept; 49[[noreturn]] void terminate() noexcept; 50 51bool uncaught_exception() noexcept; 52int uncaught_exceptions() noexcept; // C++17 53 54typedef unspecified exception_ptr; 55 56exception_ptr current_exception() noexcept; 57void rethrow_exception [[noreturn]] (exception_ptr p); 58template<class E> exception_ptr make_exception_ptr(E e) noexcept; 59 60class nested_exception 61{ 62public: 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 73template <class T> [[noreturn]] void throw_with_nested(T&& t); 74template <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 94namespace std // purposefully not using versioning namespace 95{ 96 97#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME) 98class _LIBCPP_EXCEPTION_ABI exception 99{ 100public: 101 _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {} 102 virtual ~exception() _NOEXCEPT; 103 virtual const char* what() const _NOEXCEPT; 104}; 105 106class _LIBCPP_EXCEPTION_ABI bad_exception 107 : public exception 108{ 109public: 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) 119typedef 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 125typedef 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 133class _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 140class _LIBCPP_TYPE_VIS exception_ptr 141{ 142 void* __ptr_; 143public: 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 166template<class _Ep> 167_LIBCPP_INLINE_VISIBILITY exception_ptr 168make_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 187class _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 198public: 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 209bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT; 210 211inline _LIBCPP_INLINE_VISIBILITY 212bool 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. 223template <class _E> void *__GetExceptionInfo(_E); 224 225template<class _Ep> 226_LIBCPP_INLINE_VISIBILITY exception_ptr 227make_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 235class _LIBCPP_EXCEPTION_ABI nested_exception 236{ 237 exception_ptr __ptr_; 238public: 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 249template <class _Tp> 250struct __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 258template <class _Tp, class _Up, bool> 259struct __throw_with_nested; 260 261template <class _Tp, class _Up> 262struct __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 274template <class _Tp, class _Up> 275struct __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 288template <class _Tp> 289_LIBCPP_NORETURN 290void 291#ifndef _LIBCPP_CXX03_LANG 292throw_with_nested(_Tp&& __t) 293#else 294throw_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 311template <class _From, class _To> 312struct __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 317template <class _Ep> 318inline _LIBCPP_INLINE_VISIBILITY 319void 320rethrow_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 328template <class _Ep> 329inline _LIBCPP_INLINE_VISIBILITY 330void 331rethrow_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