4c19854222
In preparation for running clang-format on the whole code base, we are also removing mentions of the legacy _LIBCPP_INLINE_VISIBILITY macro in favor of the newer _LIBCPP_HIDE_FROM_ABI. We're still leaving the definition of _LIBCPP_INLINE_VISIBILITY to avoid creating needless breakage in case some older patches are checked-in with mentions of the old macro. After we branch for LLVM 18, we can do another pass to clean up remaining uses of the macro that might have gotten introduced by mistake (if any) and remove the macro itself at the same time. This is just a minor convenience to smooth out the transition as much as possible. See https://discourse.llvm.org/t/rfc-clang-formatting-all-of-libc-once-and-for-all for the clang-format proposal.
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H
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#define _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H
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#include <__config>
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#include <__exception/exception_ptr.h>
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#include <__memory/addressof.h>
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#include <__type_traits/decay.h>
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#include <__type_traits/is_base_of.h>
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#include <__type_traits/is_class.h>
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#include <__type_traits/is_convertible.h>
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#include <__type_traits/is_copy_constructible.h>
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#include <__type_traits/is_final.h>
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#include <__type_traits/is_polymorphic.h>
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#include <__utility/forward.h>
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#include <cstddef>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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namespace std { // purposefully not using versioning namespace
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class _LIBCPP_EXPORTED_FROM_ABI nested_exception {
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exception_ptr __ptr_;
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public:
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nested_exception() _NOEXCEPT;
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_LIBCPP_HIDE_FROM_ABI nested_exception(const nested_exception&) _NOEXCEPT = default;
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_LIBCPP_HIDE_FROM_ABI nested_exception& operator=(const nested_exception&) _NOEXCEPT = default;
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virtual ~nested_exception() _NOEXCEPT;
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// access functions
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_LIBCPP_NORETURN void rethrow_nested() const;
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_LIBCPP_HIDE_FROM_ABI exception_ptr nested_ptr() const _NOEXCEPT { return __ptr_; }
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};
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template <class _Tp>
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struct __nested : public _Tp, public nested_exception {
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_LIBCPP_HIDE_FROM_ABI explicit __nested(const _Tp& __t) : _Tp(__t) {}
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};
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#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
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template <class _Tp, class _Up, bool>
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struct __throw_with_nested;
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template <class _Tp, class _Up>
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struct __throw_with_nested<_Tp, _Up, true> {
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_LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) {
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throw __nested<_Up>(std::forward<_Tp>(__t));
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}
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};
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template <class _Tp, class _Up>
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struct __throw_with_nested<_Tp, _Up, false> {
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_LIBCPP_NORETURN static inline _LIBCPP_HIDE_FROM_ABI void __do_throw(_Tp&& __t) { throw std::forward<_Tp>(__t); }
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};
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#endif
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template <class _Tp>
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_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI void throw_with_nested(_Tp&& __t) {
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#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
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using _Up = __decay_t<_Tp>;
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static_assert(is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");
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__throw_with_nested<_Tp,
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_Up,
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is_class<_Up>::value && !is_base_of<nested_exception, _Up>::value &&
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!__libcpp_is_final<_Up>::value>::__do_throw(std::forward<_Tp>(__t));
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#else
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((void)__t);
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// FIXME: Make this abort
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#endif
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}
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template <class _From, class _To>
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struct __can_dynamic_cast
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: _BoolConstant< is_polymorphic<_From>::value &&
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(!is_base_of<_To, _From>::value || is_convertible<const _From*, const _To*>::value)> {};
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template <class _Ep>
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inline _LIBCPP_HIDE_FROM_ABI void
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rethrow_if_nested(const _Ep& __e, __enable_if_t< __can_dynamic_cast<_Ep, nested_exception>::value>* = 0) {
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const nested_exception* __nep = dynamic_cast<const nested_exception*>(std::addressof(__e));
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if (__nep)
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__nep->rethrow_nested();
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}
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template <class _Ep>
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inline _LIBCPP_HIDE_FROM_ABI void
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rethrow_if_nested(const _Ep&, __enable_if_t<!__can_dynamic_cast<_Ep, nested_exception>::value>* = 0) {}
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} // namespace std
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#endif // _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H
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