217 lines
6.5 KiB
C++
217 lines
6.5 KiB
C++
// -*- C++ -*- Implement the members of exception_ptr.
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// Copyright (C) 2008-2021 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <bits/c++config.h>
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#include "eh_atomics.h"
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#if ! _GLIBCXX_INLINE_VERSION
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// This macro causes exception_ptr to declare an older API (with corresponding
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// definitions in this file) and to mark some inline functions as "used" so
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// that definitions will be emitted in this translation unit.
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#define _GLIBCXX_EH_PTR_COMPAT
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#endif
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#include <exception>
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#include <bits/exception_ptr.h>
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#include "unwind-cxx.h"
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using namespace __cxxabiv1;
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// Verify assumptions about member layout in exception types
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namespace
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{
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template<typename Ex>
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constexpr std::size_t unwindhdr()
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{ return offsetof(Ex, unwindHeader); }
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template<typename Ex>
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constexpr std::size_t termHandler()
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{ return unwindhdr<Ex>() - offsetof(Ex, terminateHandler); }
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static_assert( termHandler<__cxa_exception>()
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== termHandler<__cxa_dependent_exception>(),
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"__cxa_dependent_exception::termHandler layout must be"
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" consistent with __cxa_exception::termHandler" );
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#ifndef __ARM_EABI_UNWINDER__
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template<typename Ex>
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constexpr std::ptrdiff_t adjptr()
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{ return unwindhdr<Ex>() - offsetof(Ex, adjustedPtr); }
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static_assert( adjptr<__cxa_exception>()
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== adjptr<__cxa_dependent_exception>(),
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"__cxa_dependent_exception::adjustedPtr layout must be"
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" consistent with __cxa_exception::adjustedPtr" );
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#endif
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}
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// Define non-inline functions.
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std::__exception_ptr::exception_ptr::exception_ptr(void* obj) noexcept
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: _M_exception_object(obj) { _M_addref(); }
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std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool) noexcept
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: _M_exception_object(nullptr) { }
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void
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std::__exception_ptr::exception_ptr::_M_addref() noexcept
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{
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if (__builtin_expect(_M_exception_object != nullptr, true))
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{
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__cxa_refcounted_exception *eh =
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__get_refcounted_exception_header_from_obj (_M_exception_object);
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__gnu_cxx::__eh_atomic_inc (&eh->referenceCount);
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}
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}
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void
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std::__exception_ptr::exception_ptr::_M_release() noexcept
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{
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if (__builtin_expect(_M_exception_object != nullptr, true))
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{
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__cxa_refcounted_exception *eh =
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__get_refcounted_exception_header_from_obj (_M_exception_object);
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if (__gnu_cxx::__eh_atomic_dec (&eh->referenceCount))
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{
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if (eh->exc.exceptionDestructor)
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eh->exc.exceptionDestructor (_M_exception_object);
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__cxa_free_exception (_M_exception_object);
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_M_exception_object = nullptr;
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}
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}
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}
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void*
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std::__exception_ptr::exception_ptr::_M_get() const noexcept
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{ return _M_exception_object; }
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// Retained for compatibility with CXXABI_1.3.
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void
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std::__exception_ptr::exception_ptr::_M_safe_bool_dummy() noexcept { }
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// Retained for compatibility with CXXABI_1.3.
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bool
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std::__exception_ptr::exception_ptr::operator!() const noexcept
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{ return _M_exception_object == nullptr; }
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// Retained for compatibility with CXXABI_1.3.
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std::__exception_ptr::exception_ptr::operator __safe_bool() const noexcept
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{
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return _M_exception_object ? &exception_ptr::_M_safe_bool_dummy : nullptr;
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}
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const std::type_info*
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std::__exception_ptr::exception_ptr::__cxa_exception_type() const noexcept
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{
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__cxa_exception *eh = __get_exception_header_from_obj (_M_exception_object);
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return eh->exceptionType;
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}
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std::exception_ptr
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std::current_exception() noexcept
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{
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__cxa_eh_globals *globals = __cxa_get_globals ();
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__cxa_exception *header = globals->caughtExceptions;
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if (!header)
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return std::exception_ptr();
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// Since foreign exceptions can't be counted, we can't return them.
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if (!__is_gxx_exception_class (header->unwindHeader.exception_class))
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return std::exception_ptr();
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return std::exception_ptr(
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__get_object_from_ambiguous_exception (header));
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}
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static void
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__gxx_dependent_exception_cleanup(_Unwind_Reason_Code code,
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_Unwind_Exception *exc)
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{
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// This cleanup is set only for dependents.
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__cxa_dependent_exception *dep = __get_dependent_exception_from_ue (exc);
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__cxa_refcounted_exception *header =
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__get_refcounted_exception_header_from_obj (dep->primaryException);
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// We only want to be called through _Unwind_DeleteException.
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// _Unwind_DeleteException in the HP-UX IA64 libunwind library
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// returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
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// like the GCC _Unwind_DeleteException function does.
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if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
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__terminate (header->exc.terminateHandler);
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__cxa_free_dependent_exception (dep);
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if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount))
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{
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if (header->exc.exceptionDestructor)
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header->exc.exceptionDestructor (header + 1);
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__cxa_free_exception (header + 1);
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}
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}
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void
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std::rethrow_exception(std::exception_ptr ep)
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{
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void *obj = ep._M_get();
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__cxa_refcounted_exception *eh
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= __get_refcounted_exception_header_from_obj (obj);
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__cxa_dependent_exception *dep = __cxa_allocate_dependent_exception ();
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dep->primaryException = obj;
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__gnu_cxx::__eh_atomic_inc (&eh->referenceCount);
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dep->unexpectedHandler = get_unexpected ();
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dep->terminateHandler = get_terminate ();
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__GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep->unwindHeader.exception_class);
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dep->unwindHeader.exception_cleanup = __gxx_dependent_exception_cleanup;
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__cxa_eh_globals *globals = __cxa_get_globals ();
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globals->uncaughtExceptions += 1;
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#ifdef __USING_SJLJ_EXCEPTIONS__
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_Unwind_SjLj_RaiseException (&dep->unwindHeader);
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#else
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_Unwind_RaiseException (&dep->unwindHeader);
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#endif
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// Some sort of unwinding error. Note that terminate is a handler.
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__cxa_begin_catch (&dep->unwindHeader);
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std::terminate();
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}
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#undef _GLIBCXX_EH_PTR_COMPAT
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