Add libc++ and libc++abi to third-party.

third_party/libcxx/include/exception

+// -*- C++ -*-
+//===-------------------------- exception ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#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;
+
+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 <type_traits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+namespace std  // purposefully not using versioning namespace
+{
+
+class _LIBCPP_EXCEPTION_ABI exception
+{
+public:
+    _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
+    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;
+};
+
+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();
+
+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;
+
+class _LIBCPP_TYPE_VIS exception_ptr;
+
+_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
+_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
+
+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>
+exception_ptr
+make_exception_ptr(_Ep __e) _NOEXCEPT
+{
+#ifndef _LIBCPP_NO_EXCEPTIONS
+    try
+    {
+        throw __e;
+    }
+    catch (...)
+    {
+        return current_exception();
+    }
+#endif  // _LIBCPP_NO_EXCEPTIONS
+}
+
+// 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) {}
+};
+
+template <class _Tp>
+_LIBCPP_NORETURN
+void
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+throw_with_nested(_Tp&& __t, typename enable_if<
+                  is_class<typename remove_reference<_Tp>::type>::value &&
+                  !is_base_of<nested_exception, typename remove_reference<_Tp>::type>::value
+                                    >::type* = 0)
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+throw_with_nested (_Tp& __t, typename enable_if<
+                  is_class<_Tp>::value && !is_base_of<nested_exception, _Tp>::value
+                                    >::type* = 0)
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+{
+#ifndef _LIBCPP_NO_EXCEPTIONS
+    throw __nested<typename remove_reference<_Tp>::type>(_VSTD::forward<_Tp>(__t));
+#endif
+}
+
+template <class _Tp>
+_LIBCPP_NORETURN
+void
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+throw_with_nested(_Tp&& __t, typename enable_if<
+                  !is_class<typename remove_reference<_Tp>::type>::value ||
+                  is_base_of<nested_exception, typename remove_reference<_Tp>::type>::value
+                                    >::type* = 0)
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+throw_with_nested (_Tp& __t, typename enable_if<
+                  !is_class<_Tp>::value || is_base_of<nested_exception, _Tp>::value
+                                    >::type* = 0)
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+{
+#ifndef _LIBCPP_NO_EXCEPTIONS
+    throw _VSTD::forward<_Tp>(__t);
+#endif
+}
+
+template <class _Ep>
+inline _LIBCPP_INLINE_VISIBILITY
+void
+rethrow_if_nested(const _Ep& __e, typename enable_if<
+                                   is_polymorphic<_Ep>::value
+                                                   >::type* = 0)
+{
+    const nested_exception* __nep = dynamic_cast<const nested_exception*>(&__e);
+    if (__nep)
+        __nep->rethrow_nested();
+}
+
+template <class _Ep>
+inline _LIBCPP_INLINE_VISIBILITY
+void
+rethrow_if_nested(const _Ep&, typename enable_if<
+                                   !is_polymorphic<_Ep>::value
+                                                   >::type* = 0)
+{
+}
+
+}  // std
+
+#endif  // _LIBCPP_EXCEPTION