Library import 16 (#2433)

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1 files changed, 101 insertions, 0 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__exception/nested_exception.h b/contrib/libs/cxxsupp/libcxx/include/__exception/nested_exception.h
new file mode 100644
index 0000000000..1136c92748
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/include/__exception/nested_exception.h
@@ -0,0 +1,101 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_convertible.h>
+#include <__type_traits/is_copy_constructible.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;
+  //     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_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_INLINE_VISIBILITY 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_INLINE_VISIBILITY 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>
+inline _LIBCPP_HIDE_FROM_ABI void
+rethrow_if_nested(const _Ep& __e, __enable_if_t< __can_dynamic_cast<_Ep, nested_exception>::value>* = 0) {
+  const nested_exception* __nep = dynamic_cast<const nested_exception*>(std::addressof(__e));
+  if (__nep)
+    __nep->rethrow_nested();
+}
+
+template <class _Ep>
+inline _LIBCPP_HIDE_FROM_ABI void
+rethrow_if_nested(const _Ep&, __enable_if_t<!__can_dynamic_cast<_Ep, nested_exception>::value>* = 0) {}
+
+} // namespace std
+
+#endif // _LIBCPP___EXCEPTION_NESTED_EXCEPTION_H