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https://github.com/darlinghq/darling-libcxx.git
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3f10018902
These functions are key to allowing the use of rvalues and variadics
in C++03 mode. Everything works the same as in C++11, except for one
tangentially related case:
struct T {
T(T &&) = default;
};
In C++11, T has a deleted copy constructor. But in C++03 Clang gives
it both a move and a copy constructor. This seems reasonable enough
given the extensions it's using.
The other changes in this patch were the minimal set required
to keep the tests passing after the move/forward change. Most notably
the removal of the `__rv<unique_ptr>` hack that was present
in an attempt to make unique_ptr move only without language support.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@364063 91177308-0d34-0410-b5e6-96231b3b80d8
330 lines
9.2 KiB
C++
330 lines
9.2 KiB
C++
// -*- C++ -*-
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//===-------------------------- exception ---------------------------------===//
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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
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#define _LIBCPP_EXCEPTION
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/*
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exception synopsis
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namespace std
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{
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class exception
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{
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public:
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exception() noexcept;
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exception(const exception&) noexcept;
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exception& operator=(const exception&) noexcept;
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virtual ~exception() noexcept;
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virtual const char* what() const noexcept;
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};
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class bad_exception
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: public exception
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{
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public:
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bad_exception() noexcept;
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bad_exception(const bad_exception&) noexcept;
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bad_exception& operator=(const bad_exception&) noexcept;
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virtual ~bad_exception() noexcept;
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virtual const char* what() const noexcept;
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};
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typedef void (*unexpected_handler)();
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unexpected_handler set_unexpected(unexpected_handler f ) noexcept;
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unexpected_handler get_unexpected() noexcept;
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[[noreturn]] void unexpected();
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typedef void (*terminate_handler)();
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terminate_handler set_terminate(terminate_handler f ) noexcept;
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terminate_handler get_terminate() noexcept;
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[[noreturn]] void terminate() noexcept;
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bool uncaught_exception() noexcept;
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int uncaught_exceptions() noexcept; // C++17
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typedef unspecified exception_ptr;
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exception_ptr current_exception() noexcept;
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void rethrow_exception [[noreturn]] (exception_ptr p);
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template<class E> exception_ptr make_exception_ptr(E e) noexcept;
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class nested_exception
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{
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public:
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nested_exception() noexcept;
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nested_exception(const nested_exception&) noexcept = default;
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nested_exception& operator=(const nested_exception&) noexcept = default;
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virtual ~nested_exception() = default;
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// access functions
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[[noreturn]] void rethrow_nested() const;
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exception_ptr nested_ptr() const noexcept;
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};
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template <class T> [[noreturn]] void throw_with_nested(T&& t);
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template <class E> void rethrow_if_nested(const E& e);
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} // std
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*/
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#include <__config>
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#include <cstddef>
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#include <cstdlib>
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#include <type_traits>
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#include <version>
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#if defined(_LIBCPP_ABI_VCRUNTIME)
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#include <vcruntime_exception.h>
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#endif
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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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{
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#if !defined(_LIBCPP_ABI_VCRUNTIME)
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class _LIBCPP_EXCEPTION_ABI exception
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{
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public:
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_LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
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virtual ~exception() _NOEXCEPT;
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virtual const char* what() const _NOEXCEPT;
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};
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class _LIBCPP_EXCEPTION_ABI bad_exception
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: public exception
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{
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public:
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_LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {}
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virtual ~bad_exception() _NOEXCEPT;
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virtual const char* what() const _NOEXCEPT;
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};
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#endif // !_LIBCPP_ABI_VCRUNTIME
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#if _LIBCPP_STD_VER <= 14 \
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|| defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) \
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|| defined(_LIBCPP_BUILDING_LIBRARY)
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typedef void (*unexpected_handler)();
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_LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
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_LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT;
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_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected();
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#endif
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typedef void (*terminate_handler)();
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_LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT;
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_LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT;
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_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT;
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_LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;
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_LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT;
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class _LIBCPP_TYPE_VIS exception_ptr;
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_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
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_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
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#ifndef _LIBCPP_ABI_MICROSOFT
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class _LIBCPP_TYPE_VIS exception_ptr
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{
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void* __ptr_;
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public:
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_LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {}
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_LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}
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exception_ptr(const exception_ptr&) _NOEXCEPT;
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exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
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~exception_ptr() _NOEXCEPT;
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_EXPLICIT operator bool() const _NOEXCEPT
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{return __ptr_ != nullptr;}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
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{return __x.__ptr_ == __y.__ptr_;}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
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{return !(__x == __y);}
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friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
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friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
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};
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template<class _Ep>
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_LIBCPP_INLINE_VISIBILITY exception_ptr
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make_exception_ptr(_Ep __e) _NOEXCEPT
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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try
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{
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throw __e;
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}
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catch (...)
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{
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return current_exception();
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}
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#else
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((void)__e);
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_VSTD::abort();
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#endif
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}
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#else // _LIBCPP_ABI_MICROSOFT
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class _LIBCPP_TYPE_VIS exception_ptr
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{
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#if defined(__clang__)
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wunused-private-field"
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#endif
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void* __ptr1_;
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void* __ptr2_;
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#if defined(__clang__)
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#pragma clang diagnostic pop
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#endif
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public:
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exception_ptr() _NOEXCEPT;
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exception_ptr(nullptr_t) _NOEXCEPT;
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exception_ptr(const exception_ptr& __other) _NOEXCEPT;
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exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT;
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exception_ptr& operator=(nullptr_t) _NOEXCEPT;
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~exception_ptr() _NOEXCEPT;
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_LIBCPP_EXPLICIT operator bool() const _NOEXCEPT;
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};
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_LIBCPP_FUNC_VIS
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bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;
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inline _LIBCPP_INLINE_VISIBILITY
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bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
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{return !(__x == __y);}
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_LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
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_LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void *__except, const void* __ptr);
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_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
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_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr p);
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// This is a built-in template function which automagically extracts the required
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// information.
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template <class _E> void *__GetExceptionInfo(_E);
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template<class _Ep>
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_LIBCPP_INLINE_VISIBILITY exception_ptr
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make_exception_ptr(_Ep __e) _NOEXCEPT
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{
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return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e));
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}
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#endif // _LIBCPP_ABI_MICROSOFT
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// nested_exception
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class _LIBCPP_EXCEPTION_ABI nested_exception
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{
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exception_ptr __ptr_;
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public:
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nested_exception() _NOEXCEPT;
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// nested_exception(const nested_exception&) noexcept = default;
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// 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_INLINE_VISIBILITY 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
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: public _Tp,
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public nested_exception
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{
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_LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {}
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};
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#ifndef _LIBCPP_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_INLINE_VISIBILITY void
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__do_throw(_Tp&& __t)
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{
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throw __nested<_Up>(_VSTD::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_INLINE_VISIBILITY void
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#ifndef _LIBCPP_CXX03_LANG
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__do_throw(_Tp&& __t)
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#else
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__do_throw (_Tp& __t)
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#endif // _LIBCPP_CXX03_LANG
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{
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throw _VSTD::forward<_Tp>(__t);
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}
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};
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#endif
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template <class _Tp>
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_LIBCPP_NORETURN
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void
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throw_with_nested(_Tp&& __t)
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{
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#ifndef _LIBCPP_NO_EXCEPTIONS
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typedef typename decay<_Tp>::type _Up;
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static_assert( is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");
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__throw_with_nested<_Tp, _Up,
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is_class<_Up>::value &&
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!is_base_of<nested_exception, _Up>::value &&
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!__libcpp_is_final<_Up>::value>::
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__do_throw(_VSTD::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 : public _LIBCPP_BOOL_CONSTANT(
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is_polymorphic<_From>::value &&
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(!is_base_of<_To, _From>::value ||
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is_convertible<const _From*, const _To*>::value)) {};
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template <class _Ep>
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inline _LIBCPP_INLINE_VISIBILITY
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void
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rethrow_if_nested(const _Ep& __e,
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typename enable_if< __can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
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{
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const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::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_INLINE_VISIBILITY
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void
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rethrow_if_nested(const _Ep&,
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typename enable_if<!__can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
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{
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}
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} // std
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#endif // _LIBCPP_EXCEPTION
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