2 //===-------------------------- exception ---------------------------------===//
4 // The LLVM Compiler Infrastructure
6 // This file is dual licensed under the MIT and the University of Illinois Open
7 // Source Licenses. See LICENSE.TXT for details.
9 //===----------------------------------------------------------------------===//
11 #ifndef _LIBCPP_EXCEPTION
12 #define _LIBCPP_EXCEPTION
24 exception(const exception&) noexcept;
25 exception& operator=(const exception&) noexcept;
26 virtual ~exception() noexcept;
27 virtual const char* what() const noexcept;
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;
41 typedef void (*unexpected_handler)();
42 unexpected_handler set_unexpected(unexpected_handler f ) noexcept;
43 unexpected_handler get_unexpected() noexcept;
44 [[noreturn]] void unexpected();
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;
51 bool uncaught_exception() noexcept;
52 int uncaught_exceptions() noexcept; // C++17
54 typedef unspecified exception_ptr;
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;
60 class nested_exception
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;
69 [[noreturn]] void rethrow_nested() const;
70 exception_ptr nested_ptr() const noexcept;
73 template <class T> [[noreturn]] void throw_with_nested(T&& t);
74 template <class E> void rethrow_if_nested(const E& e);
83 #include <type_traits>
86 #if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
87 #include <vcruntime_exception.h>
90 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
91 #pragma GCC system_header
94 namespace std // purposefully not using versioning namespace
97 #if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
98 class _LIBCPP_EXCEPTION_ABI exception
101 _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
102 virtual ~exception() _NOEXCEPT;
103 virtual const char* what() const _NOEXCEPT;
106 class _LIBCPP_EXCEPTION_ABI bad_exception
110 _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {}
111 virtual ~bad_exception() _NOEXCEPT;
112 virtual const char* what() const _NOEXCEPT;
114 #endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME
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();
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;
130 _LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;
131 _LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT;
133 class _LIBCPP_TYPE_VIS exception_ptr;
135 _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
136 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
138 #ifndef _LIBCPP_ABI_MICROSOFT
140 class _LIBCPP_TYPE_VIS exception_ptr
144 _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {}
145 _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}
147 exception_ptr(const exception_ptr&) _NOEXCEPT;
148 exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
149 ~exception_ptr() _NOEXCEPT;
151 _LIBCPP_INLINE_VISIBILITY _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT
152 {return __ptr_ != nullptr;}
154 friend _LIBCPP_INLINE_VISIBILITY
155 bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
156 {return __x.__ptr_ == __y.__ptr_;}
158 friend _LIBCPP_INLINE_VISIBILITY
159 bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
160 {return !(__x == __y);}
162 friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
163 friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
167 _LIBCPP_INLINE_VISIBILITY exception_ptr
168 make_exception_ptr(_Ep __e) _NOEXCEPT
170 #ifndef _LIBCPP_NO_EXCEPTIONS
177 return current_exception();
185 #else // _LIBCPP_ABI_MICROSOFT
187 class _LIBCPP_TYPE_VIS exception_ptr
189 #if defined(__clang__)
190 #pragma clang diagnostic push
191 #pragma clang diagnostic ignored "-Wunused-private-field"
195 #if defined(__clang__)
196 #pragma clang diagnostic pop
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;
209 bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;
211 inline _LIBCPP_INLINE_VISIBILITY
212 bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
213 {return !(__x == __y);}
215 _LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
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);
221 // This is a built-in template function which automagically extracts the required
223 template <class _E> void *__GetExceptionInfo(_E);
226 _LIBCPP_INLINE_VISIBILITY exception_ptr
227 make_exception_ptr(_Ep __e) _NOEXCEPT
229 return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e));
232 #endif // _LIBCPP_ABI_MICROSOFT
235 class _LIBCPP_EXCEPTION_ABI nested_exception
237 exception_ptr __ptr_;
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;
245 _LIBCPP_NORETURN void rethrow_nested() const;
246 _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;}
252 public nested_exception
254 _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {}
257 #ifndef _LIBCPP_NO_EXCEPTIONS
258 template <class _Tp, class _Up, bool>
259 struct __throw_with_nested;
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)
267 __do_throw (_Tp& __t)
268 #endif // _LIBCPP_CXX03_LANG
270 throw __nested<_Up>(_VSTD::forward<_Tp>(__t));
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)
280 __do_throw (_Tp& __t)
281 #endif // _LIBCPP_CXX03_LANG
283 throw _VSTD::forward<_Tp>(__t);
291 #ifndef _LIBCPP_CXX03_LANG
292 throw_with_nested(_Tp&& __t)
294 throw_with_nested (_Tp& __t)
295 #endif // _LIBCPP_CXX03_LANG
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));
307 // FIXME: Make this abort
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)) {};
318 inline _LIBCPP_INLINE_VISIBILITY
320 rethrow_if_nested(const _Ep& __e,
321 typename enable_if< __can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
323 const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::addressof(__e));
325 __nep->rethrow_nested();
329 inline _LIBCPP_INLINE_VISIBILITY
331 rethrow_if_nested(const _Ep&,
332 typename enable_if<!__can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
338 #endif // _LIBCPP_EXCEPTION