2 //===-------------------------- exception ---------------------------------===//
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
8 //===----------------------------------------------------------------------===//
10 #ifndef _LIBCPP_EXCEPTION
11 #define _LIBCPP_EXCEPTION
23 exception(const exception&) noexcept;
24 exception& operator=(const exception&) noexcept;
25 virtual ~exception() noexcept;
26 virtual const char* what() const noexcept;
33 bad_exception() noexcept;
34 bad_exception(const bad_exception&) noexcept;
35 bad_exception& operator=(const bad_exception&) noexcept;
36 virtual ~bad_exception() noexcept;
37 virtual const char* what() const noexcept;
40 typedef void (*unexpected_handler)();
41 unexpected_handler set_unexpected(unexpected_handler f ) noexcept;
42 unexpected_handler get_unexpected() noexcept;
43 [[noreturn]] void unexpected();
45 typedef void (*terminate_handler)();
46 terminate_handler set_terminate(terminate_handler f ) noexcept;
47 terminate_handler get_terminate() noexcept;
48 [[noreturn]] void terminate() noexcept;
50 bool uncaught_exception() noexcept;
51 int uncaught_exceptions() noexcept; // C++17
53 typedef unspecified exception_ptr;
55 exception_ptr current_exception() noexcept;
56 void rethrow_exception [[noreturn]] (exception_ptr p);
57 template<class E> exception_ptr make_exception_ptr(E e) noexcept;
59 class nested_exception
62 nested_exception() noexcept;
63 nested_exception(const nested_exception&) noexcept = default;
64 nested_exception& operator=(const nested_exception&) noexcept = default;
65 virtual ~nested_exception() = default;
68 [[noreturn]] void rethrow_nested() const;
69 exception_ptr nested_ptr() const noexcept;
72 template <class T> [[noreturn]] void throw_with_nested(T&& t);
73 template <class E> void rethrow_if_nested(const E& e);
82 #include <type_traits>
85 #if defined(_LIBCPP_ABI_VCRUNTIME)
86 #include <vcruntime_exception.h>
89 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
90 #pragma GCC system_header
93 namespace std // purposefully not using versioning namespace
96 #if !defined(_LIBCPP_ABI_VCRUNTIME)
97 class _LIBCPP_EXCEPTION_ABI exception
100 _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
101 _LIBCPP_INLINE_VISIBILITY exception(const exception&) _NOEXCEPT = default;
103 virtual ~exception() _NOEXCEPT;
104 virtual const char* what() const _NOEXCEPT;
107 class _LIBCPP_EXCEPTION_ABI bad_exception
111 _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {}
112 virtual ~bad_exception() _NOEXCEPT;
113 virtual const char* what() const _NOEXCEPT;
115 #endif // !_LIBCPP_ABI_VCRUNTIME
117 #if _LIBCPP_STD_VER <= 14 \
118 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) \
119 || defined(_LIBCPP_BUILDING_LIBRARY)
120 typedef void (*unexpected_handler)();
121 _LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
122 _LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT;
123 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected();
126 typedef void (*terminate_handler)();
127 _LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT;
128 _LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT;
129 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT;
131 _LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;
132 _LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT;
134 class _LIBCPP_TYPE_VIS exception_ptr;
136 _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
137 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
139 #ifndef _LIBCPP_ABI_MICROSOFT
141 class _LIBCPP_TYPE_VIS exception_ptr
145 _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {}
146 _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}
148 exception_ptr(const exception_ptr&) _NOEXCEPT;
149 exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
150 ~exception_ptr() _NOEXCEPT;
152 _LIBCPP_INLINE_VISIBILITY _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT
153 {return __ptr_ != nullptr;}
155 friend _LIBCPP_INLINE_VISIBILITY
156 bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
157 {return __x.__ptr_ == __y.__ptr_;}
159 friend _LIBCPP_INLINE_VISIBILITY
160 bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
161 {return !(__x == __y);}
163 friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
164 friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
168 _LIBCPP_INLINE_VISIBILITY exception_ptr
169 make_exception_ptr(_Ep __e) _NOEXCEPT
171 #ifndef _LIBCPP_NO_EXCEPTIONS
178 return current_exception();
186 #else // _LIBCPP_ABI_MICROSOFT
188 class _LIBCPP_TYPE_VIS exception_ptr
190 #if defined(__clang__)
191 #pragma clang diagnostic push
192 #pragma clang diagnostic ignored "-Wunused-private-field"
196 #if defined(__clang__)
197 #pragma clang diagnostic pop
200 exception_ptr() _NOEXCEPT;
201 exception_ptr(nullptr_t) _NOEXCEPT;
202 exception_ptr(const exception_ptr& __other) _NOEXCEPT;
203 exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT;
204 exception_ptr& operator=(nullptr_t) _NOEXCEPT;
205 ~exception_ptr() _NOEXCEPT;
206 _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT;
210 bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;
212 inline _LIBCPP_INLINE_VISIBILITY
213 bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
214 {return !(__x == __y);}
216 _LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
218 _LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void *__except, const void* __ptr);
219 _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
220 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr p);
222 // This is a built-in template function which automagically extracts the required
224 template <class _E> void *__GetExceptionInfo(_E);
227 _LIBCPP_INLINE_VISIBILITY exception_ptr
228 make_exception_ptr(_Ep __e) _NOEXCEPT
230 return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e));
233 #endif // _LIBCPP_ABI_MICROSOFT
236 class _LIBCPP_EXCEPTION_ABI nested_exception
238 exception_ptr __ptr_;
240 nested_exception() _NOEXCEPT;
241 // nested_exception(const nested_exception&) noexcept = default;
242 // nested_exception& operator=(const nested_exception&) noexcept = default;
243 virtual ~nested_exception() _NOEXCEPT;
246 _LIBCPP_NORETURN void rethrow_nested() const;
247 _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;}
253 public nested_exception
255 _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {}
258 #ifndef _LIBCPP_NO_EXCEPTIONS
259 template <class _Tp, class _Up, bool>
260 struct __throw_with_nested;
262 template <class _Tp, class _Up>
263 struct __throw_with_nested<_Tp, _Up, true> {
264 _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void
265 __do_throw(_Tp&& __t)
267 throw __nested<_Up>(_VSTD::forward<_Tp>(__t));
271 template <class _Tp, class _Up>
272 struct __throw_with_nested<_Tp, _Up, false> {
273 _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void
274 #ifndef _LIBCPP_CXX03_LANG
275 __do_throw(_Tp&& __t)
277 __do_throw (_Tp& __t)
278 #endif // _LIBCPP_CXX03_LANG
280 throw _VSTD::forward<_Tp>(__t);
288 throw_with_nested(_Tp&& __t)
290 #ifndef _LIBCPP_NO_EXCEPTIONS
291 typedef typename decay<_Tp>::type _Up;
292 static_assert( is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");
293 __throw_with_nested<_Tp, _Up,
294 is_class<_Up>::value &&
295 !is_base_of<nested_exception, _Up>::value &&
296 !__libcpp_is_final<_Up>::value>::
297 __do_throw(_VSTD::forward<_Tp>(__t));
300 // FIXME: Make this abort
304 template <class _From, class _To>
305 struct __can_dynamic_cast : public _LIBCPP_BOOL_CONSTANT(
306 is_polymorphic<_From>::value &&
307 (!is_base_of<_To, _From>::value ||
308 is_convertible<const _From*, const _To*>::value)) {};
311 inline _LIBCPP_INLINE_VISIBILITY
313 rethrow_if_nested(const _Ep& __e,
314 typename enable_if< __can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
316 const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::addressof(__e));
318 __nep->rethrow_nested();
322 inline _LIBCPP_INLINE_VISIBILITY
324 rethrow_if_nested(const _Ep&,
325 typename enable_if<!__can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
331 #endif // _LIBCPP_EXCEPTION