| // -*- C++ -*- |
| //===-------------------------- exception ---------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP_EXCEPTION |
| #define _LIBCPP_EXCEPTION |
| |
| /* |
| exception synopsis |
| |
| namespace std |
| { |
| |
| class exception |
| { |
| public: |
| exception() noexcept; |
| exception(const exception&) noexcept; |
| exception& operator=(const exception&) noexcept; |
| virtual ~exception() noexcept; |
| virtual const char* what() const noexcept; |
| }; |
| |
| class bad_exception |
| : public exception |
| { |
| public: |
| bad_exception() noexcept; |
| bad_exception(const bad_exception&) noexcept; |
| bad_exception& operator=(const bad_exception&) noexcept; |
| virtual ~bad_exception() noexcept; |
| virtual const char* what() const noexcept; |
| }; |
| |
| typedef void (*unexpected_handler)(); |
| unexpected_handler set_unexpected(unexpected_handler f ) noexcept; |
| unexpected_handler get_unexpected() noexcept; |
| [[noreturn]] void unexpected(); |
| |
| typedef void (*terminate_handler)(); |
| terminate_handler set_terminate(terminate_handler f ) noexcept; |
| terminate_handler get_terminate() noexcept; |
| [[noreturn]] void terminate() noexcept; |
| |
| bool uncaught_exception() noexcept; |
| int uncaught_exceptions() noexcept; // C++17 |
| |
| typedef unspecified exception_ptr; |
| |
| exception_ptr current_exception() noexcept; |
| void rethrow_exception [[noreturn]] (exception_ptr p); |
| template<class E> exception_ptr make_exception_ptr(E e) noexcept; |
| |
| class nested_exception |
| { |
| public: |
| nested_exception() noexcept; |
| nested_exception(const nested_exception&) noexcept = default; |
| nested_exception& operator=(const nested_exception&) noexcept = default; |
| virtual ~nested_exception() = default; |
| |
| // access functions |
| [[noreturn]] void rethrow_nested() const; |
| exception_ptr nested_ptr() const noexcept; |
| }; |
| |
| template <class T> [[noreturn]] void throw_with_nested(T&& t); |
| template <class E> void rethrow_if_nested(const E& e); |
| |
| } // std |
| |
| */ |
| |
| #include <__config> |
| #include <cstddef> |
| #include <cstdlib> |
| #include <type_traits> |
| #include <version> |
| |
| #if defined(_LIBCPP_ABI_VCRUNTIME) |
| #include <vcruntime_exception.h> |
| #endif |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| namespace std // purposefully not using versioning namespace |
| { |
| |
| #if !defined(_LIBCPP_ABI_VCRUNTIME) |
| class _LIBCPP_EXCEPTION_ABI exception |
| { |
| public: |
| _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {} |
| _LIBCPP_INLINE_VISIBILITY exception(const exception&) _NOEXCEPT = default; |
| |
| virtual ~exception() _NOEXCEPT; |
| virtual const char* what() const _NOEXCEPT; |
| }; |
| |
| class _LIBCPP_EXCEPTION_ABI bad_exception |
| : public exception |
| { |
| public: |
| _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {} |
| virtual ~bad_exception() _NOEXCEPT; |
| virtual const char* what() const _NOEXCEPT; |
| }; |
| #endif // !_LIBCPP_ABI_VCRUNTIME |
| |
| #if _LIBCPP_STD_VER <= 14 \ |
| || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) \ |
| || defined(_LIBCPP_BUILDING_LIBRARY) |
| typedef void (*unexpected_handler)(); |
| _LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT; |
| _LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT; |
| _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected(); |
| #endif |
| |
| typedef void (*terminate_handler)(); |
| _LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT; |
| _LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT; |
| _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT; |
| |
| _LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT; |
| _LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT; |
| |
| class _LIBCPP_TYPE_VIS exception_ptr; |
| |
| _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT; |
| _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr); |
| |
| #ifndef _LIBCPP_ABI_MICROSOFT |
| |
| class _LIBCPP_TYPE_VIS exception_ptr |
| { |
| void* __ptr_; |
| public: |
| _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {} |
| _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {} |
| |
| exception_ptr(const exception_ptr&) _NOEXCEPT; |
| exception_ptr& operator=(const exception_ptr&) _NOEXCEPT; |
| ~exception_ptr() _NOEXCEPT; |
| |
| _LIBCPP_INLINE_VISIBILITY _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT |
| {return __ptr_ != nullptr;} |
| |
| friend _LIBCPP_INLINE_VISIBILITY |
| bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT |
| {return __x.__ptr_ == __y.__ptr_;} |
| |
| friend _LIBCPP_INLINE_VISIBILITY |
| bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT |
| {return !(__x == __y);} |
| |
| friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT; |
| friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr); |
| }; |
| |
| template<class _Ep> |
| _LIBCPP_INLINE_VISIBILITY exception_ptr |
| make_exception_ptr(_Ep __e) _NOEXCEPT |
| { |
| #ifndef _LIBCPP_NO_EXCEPTIONS |
| try |
| { |
| throw __e; |
| } |
| catch (...) |
| { |
| return current_exception(); |
| } |
| #else |
| ((void)__e); |
| _VSTD::abort(); |
| #endif |
| } |
| |
| #else // _LIBCPP_ABI_MICROSOFT |
| |
| class _LIBCPP_TYPE_VIS exception_ptr |
| { |
| #if defined(__clang__) |
| #pragma clang diagnostic push |
| #pragma clang diagnostic ignored "-Wunused-private-field" |
| #endif |
| void* __ptr1_; |
| void* __ptr2_; |
| #if defined(__clang__) |
| #pragma clang diagnostic pop |
| #endif |
| public: |
| exception_ptr() _NOEXCEPT; |
| exception_ptr(nullptr_t) _NOEXCEPT; |
| exception_ptr(const exception_ptr& __other) _NOEXCEPT; |
| exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT; |
| exception_ptr& operator=(nullptr_t) _NOEXCEPT; |
| ~exception_ptr() _NOEXCEPT; |
| _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT; |
| }; |
| |
| _LIBCPP_FUNC_VIS |
| bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT; |
| |
| inline _LIBCPP_INLINE_VISIBILITY |
| bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT |
| {return !(__x == __y);} |
| |
| _LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT; |
| |
| _LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void *__except, const void* __ptr); |
| _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT; |
| _LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr p); |
| |
| // This is a built-in template function which automagically extracts the required |
| // information. |
| template <class _E> void *__GetExceptionInfo(_E); |
| |
| template<class _Ep> |
| _LIBCPP_INLINE_VISIBILITY exception_ptr |
| make_exception_ptr(_Ep __e) _NOEXCEPT |
| { |
| return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e)); |
| } |
| |
| #endif // _LIBCPP_ABI_MICROSOFT |
| // nested_exception |
| |
| class _LIBCPP_EXCEPTION_ABI nested_exception |
| { |
| exception_ptr __ptr_; |
| public: |
| nested_exception() _NOEXCEPT; |
| // nested_exception(const nested_exception&) noexcept = default; |
| // nested_exception& operator=(const nested_exception&) noexcept = default; |
| virtual ~nested_exception() _NOEXCEPT; |
| |
| // access functions |
| _LIBCPP_NORETURN void rethrow_nested() const; |
| _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;} |
| }; |
| |
| template <class _Tp> |
| struct __nested |
| : public _Tp, |
| public nested_exception |
| { |
| _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {} |
| }; |
| |
| #ifndef _LIBCPP_NO_EXCEPTIONS |
| template <class _Tp, class _Up, bool> |
| struct __throw_with_nested; |
| |
| template <class _Tp, class _Up> |
| struct __throw_with_nested<_Tp, _Up, true> { |
| _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void |
| __do_throw(_Tp&& __t) |
| { |
| throw __nested<_Up>(_VSTD::forward<_Tp>(__t)); |
| } |
| }; |
| |
| template <class _Tp, class _Up> |
| struct __throw_with_nested<_Tp, _Up, false> { |
| _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void |
| #ifndef _LIBCPP_CXX03_LANG |
| __do_throw(_Tp&& __t) |
| #else |
| __do_throw (_Tp& __t) |
| #endif // _LIBCPP_CXX03_LANG |
| { |
| throw _VSTD::forward<_Tp>(__t); |
| } |
| }; |
| #endif |
| |
| template <class _Tp> |
| _LIBCPP_NORETURN |
| void |
| throw_with_nested(_Tp&& __t) |
| { |
| #ifndef _LIBCPP_NO_EXCEPTIONS |
| typedef typename decay<_Tp>::type _Up; |
| static_assert( is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible"); |
| __throw_with_nested<_Tp, _Up, |
| is_class<_Up>::value && |
| !is_base_of<nested_exception, _Up>::value && |
| !__libcpp_is_final<_Up>::value>:: |
| __do_throw(_VSTD::forward<_Tp>(__t)); |
| #else |
| ((void)__t); |
| // FIXME: Make this abort |
| #endif |
| } |
| |
| template <class _From, class _To> |
| struct __can_dynamic_cast : public _LIBCPP_BOOL_CONSTANT( |
| is_polymorphic<_From>::value && |
| (!is_base_of<_To, _From>::value || |
| is_convertible<const _From*, const _To*>::value)) {}; |
| |
| template <class _Ep> |
| inline _LIBCPP_INLINE_VISIBILITY |
| void |
| rethrow_if_nested(const _Ep& __e, |
| typename enable_if< __can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0) |
| { |
| const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::addressof(__e)); |
| if (__nep) |
| __nep->rethrow_nested(); |
| } |
| |
| template <class _Ep> |
| inline _LIBCPP_INLINE_VISIBILITY |
| void |
| rethrow_if_nested(const _Ep&, |
| typename enable_if<!__can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0) |
| { |
| } |
| |
| } // std |
| |
| #endif // _LIBCPP_EXCEPTION |