| //===----------------------------------------------------------------------===// |
| // |
| // 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_NESTED_EXCEPTION_H |
| #define _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H |
| |
| #include <__config> |
| #include <__exception/exception_ptr.h> |
| #include <__memory/addressof.h> |
| #include <__type_traits/decay.h> |
| #include <__type_traits/is_base_of.h> |
| #include <__type_traits/is_class.h> |
| #include <__type_traits/is_constructible.h> |
| #include <__type_traits/is_convertible.h> |
| #include <__type_traits/is_final.h> |
| #include <__type_traits/is_polymorphic.h> |
| #include <__utility/forward.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| namespace std { // purposefully not using versioning namespace |
| |
| class _LIBCPP_EXPORTED_FROM_ABI nested_exception { |
| exception_ptr __ptr_; |
| |
| public: |
| nested_exception() _NOEXCEPT; |
| _LIBCPP_HIDE_FROM_ABI nested_exception(const nested_exception&) _NOEXCEPT = default; |
| _LIBCPP_HIDE_FROM_ABI nested_exception& operator=(const nested_exception&) _NOEXCEPT = default; |
| virtual ~nested_exception() _NOEXCEPT; |
| |
| // access functions |
| _LIBCPP_NORETURN void rethrow_nested() const; |
| _LIBCPP_HIDE_FROM_ABI exception_ptr nested_ptr() const _NOEXCEPT { return __ptr_; } |
| }; |
| |
| template <class _Tp> |
| struct __nested : public _Tp, public nested_exception { |
| _LIBCPP_HIDE_FROM_ABI explicit __nested(const _Tp& __t) : _Tp(__t) {} |
| }; |
| |
| #ifndef _LIBCPP_HAS_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_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { |
| throw __nested<_Up>(std::forward<_Tp>(__t)); |
| } |
| }; |
| |
| template <class _Tp, class _Up> |
| struct __throw_with_nested<_Tp, _Up, false> { |
| _LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); } |
| }; |
| #endif |
| |
| template <class _Tp> |
| _LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) { |
| #ifndef _LIBCPP_HAS_NO_EXCEPTIONS |
| using _Up = __decay_t<_Tp>; |
| 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(std::forward<_Tp>(__t)); |
| #else |
| ((void)__t); |
| // FIXME: Make this abort |
| #endif |
| } |
| |
| template <class _From, class _To> |
| struct __can_dynamic_cast |
| : _BoolConstant< is_polymorphic<_From>::value && |
| (!is_base_of<_To, _From>::value || is_convertible<const _From*, const _To*>::value)> {}; |
| |
| template <class _Ep, __enable_if_t< __can_dynamic_cast<_Ep, nested_exception>::value, int> = 0> |
| inline _LIBCPP_HIDE_FROM_ABI void rethrow_if_nested(const _Ep& __e) { |
| const nested_exception* __nep = dynamic_cast<const nested_exception*>(std::addressof(__e)); |
| if (__nep) |
| __nep->rethrow_nested(); |
| } |
| |
| template <class _Ep, __enable_if_t<!__can_dynamic_cast<_Ep, nested_exception>::value, int> = 0> |
| inline _LIBCPP_HIDE_FROM_ABI void rethrow_if_nested(const _Ep&) {} |
| |
| } // namespace std |
| |
| #endif // _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H |