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author | Paolo Carlini <paolo.carlini@oracle.com> | 2008-08-14 01:17:09 +0000 |
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committer | Paolo Carlini <paolo@gcc.gnu.org> | 2008-08-14 01:17:09 +0000 |
commit | 6d419a6ef357429e73332bbecdbe63101f8f4c38 (patch) | |
tree | 19f7ce6744aac513f00fbcecbb637546b8901b38 /libstdc++-v3/libsupc++/eh_ptr.cc | |
parent | 23a9a619f773f18731caf7e7ec1c50ca1379624f (diff) | |
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Re-instate last patch...
2008-08-13 Paolo Carlini <paolo.carlini@oracle.com>
Re-instate last patch, amended to use __exchange_and_add_dispatch
and __atomic_add_dispatch in eh_ptr.cc and eh_throw.cc.
From-SVN: r139091
Diffstat (limited to 'libstdc++-v3/libsupc++/eh_ptr.cc')
-rw-r--r-- | libstdc++-v3/libsupc++/eh_ptr.cc | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/libstdc++-v3/libsupc++/eh_ptr.cc b/libstdc++-v3/libsupc++/eh_ptr.cc new file mode 100644 index 0000000..35ba5f9 --- /dev/null +++ b/libstdc++-v3/libsupc++/eh_ptr.cc @@ -0,0 +1,236 @@ +// -*- C++ -*- Implement the members of exception_ptr. +// Copyright (C) 2008 Free Software Foundation, Inc. +// +// This file is part of GCC. +// +// GCC is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2, or (at your option) +// any later version. +// +// GCC is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with GCC; see the file COPYING. If not, write to +// the Free Software Foundation, 51 Franklin Street, Fifth Floor, +// Boston, MA 02110-1301, USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +#include <bits/c++config.h> +#include <exception> +#include <exception_ptr.h> +#include "unwind-cxx.h" + +using namespace __cxxabiv1; + + +std::__exception_ptr::exception_ptr::exception_ptr() throw() + : _M_exception_object(0) +{ +} + + +std::__exception_ptr::exception_ptr::exception_ptr(void* obj) throw() + : _M_exception_object(obj) +{ + _M_addref(); +} + + +std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool) throw() + : _M_exception_object(0) +{ +} + + +std::__exception_ptr::exception_ptr::exception_ptr( + const exception_ptr& other) throw() + : _M_exception_object(other._M_exception_object) +{ + _M_addref(); +} + + +std::__exception_ptr::exception_ptr::~exception_ptr() throw() +{ + _M_release(); +} + + +std::__exception_ptr::exception_ptr& +std::__exception_ptr::exception_ptr::operator=( + const exception_ptr& other) throw() +{ + exception_ptr(other).swap(*this); + return *this; +} + + +void +std::__exception_ptr::exception_ptr::_M_addref() throw() +{ + if (_M_exception_object) + { + __cxa_exception *eh = + __get_exception_header_from_obj (_M_exception_object); + __gnu_cxx::__atomic_add_dispatch (&eh->referenceCount, 1); + } +} + + +void +std::__exception_ptr::exception_ptr::_M_release() throw() +{ + if (_M_exception_object) + { + __cxa_exception *eh = + __get_exception_header_from_obj (_M_exception_object); + if (__gnu_cxx::__exchange_and_add_dispatch (&eh->referenceCount, -1) == 0) + { + if (eh->exceptionDestructor) + eh->exceptionDestructor (_M_exception_object); + + __cxa_free_exception (_M_exception_object); + _M_exception_object = 0; + } + } +} + + +void* +std::__exception_ptr::exception_ptr::_M_get() const throw() +{ + return _M_exception_object; +} + + +void +std::__exception_ptr::exception_ptr::_M_safe_bool_dummy() +{ +} + + +void +std::__exception_ptr::exception_ptr::swap(exception_ptr &other) throw() +{ + void *tmp = _M_exception_object; + _M_exception_object = other._M_exception_object; + other._M_exception_object = tmp; +} + + +bool +std::__exception_ptr::exception_ptr::operator!() const throw() +{ + return _M_exception_object == 0; +} + + +std::__exception_ptr::exception_ptr::operator __safe_bool() const throw() +{ + return _M_exception_object ? &exception_ptr::_M_safe_bool_dummy : 0; +} + + +const std::type_info* +std::__exception_ptr::exception_ptr::__cxa_exception_type() const throw() +{ + __cxa_exception *eh = __get_exception_header_from_obj (_M_exception_object); + return eh->exceptionType; +} + + +bool std::__exception_ptr::operator==(const exception_ptr& lhs, + const exception_ptr& rhs) throw() +{ + return lhs._M_exception_object == rhs._M_exception_object; +} + + +bool std::__exception_ptr::operator!=(const exception_ptr& lhs, + const exception_ptr& rhs) throw() +{ + return !(lhs == rhs); +} + + +std::exception_ptr +std::current_exception() throw() +{ + __cxa_eh_globals *globals = __cxa_get_globals (); + __cxa_exception *header = globals->caughtExceptions; + + if (!header) + return std::exception_ptr(); + + // Since foreign exceptions can't be counted, we can't return them. + if (!__is_gxx_exception_class (header->unwindHeader.exception_class)) + return std::exception_ptr(); + + return std::exception_ptr( + __get_object_from_ambiguous_exception (header)); +} + + +static void +__gxx_dependent_exception_cleanup (_Unwind_Reason_Code code, + _Unwind_Exception *exc) +{ + // This cleanup is set only for dependents. + __cxa_dependent_exception *dep = __get_dependent_exception_from_ue (exc); + __cxa_exception *header = + __get_exception_header_from_obj (dep->primaryException); + + // We only want to be called through _Unwind_DeleteException. + // _Unwind_DeleteException in the HP-UX IA64 libunwind library + // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT + // like the GCC _Unwind_DeleteException function does. + if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON) + __terminate (header->terminateHandler); + + if (__gnu_cxx::__exchange_and_add_dispatch (&header->referenceCount, -1) == 0) + { + if (header->exceptionDestructor) + header->exceptionDestructor (header + 1); + + __cxa_free_exception (header + 1); + } +} + + +void +std::rethrow_exception(std::exception_ptr ep) +{ + void *obj = ep._M_get(); + __cxa_exception *eh = __get_exception_header_from_obj (obj); + + __cxa_dependent_exception *dep = __cxa_allocate_dependent_exception (); + dep->primaryException = obj; + __gnu_cxx::__atomic_add_dispatch (&eh->referenceCount, 1); + + dep->unexpectedHandler = __unexpected_handler; + dep->terminateHandler = __terminate_handler; + __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep->unwindHeader.exception_class); + dep->unwindHeader.exception_cleanup = __gxx_dependent_exception_cleanup; + +#ifdef _GLIBCXX_SJLJ_EXCEPTIONS + _Unwind_SjLj_RaiseException (&dep->unwindHeader); +#else + _Unwind_RaiseException (&dep->unwindHeader); +#endif + + // Some sort of unwinding error. Note that terminate is a handler. + __cxa_begin_catch (&dep->unwindHeader); + std::terminate (); +} |