freebsd-dev/contrib/libstdc++/libsupc++/eh_throw.cc
2003-07-11 03:42:04 +00:00

113 lines
3.8 KiB
C++

// -*- C++ -*- Exception handling routines for throwing.
// Copyright (C) 2001, 2003 Free Software Foundation, Inc.
//
// This file is part of GNU CC.
//
// GNU CC 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.
//
// GNU CC 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 GNU CC; see the file COPYING. If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, 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 "unwind-cxx.h"
using namespace __cxxabiv1;
static void
__gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
{
__cxa_exception *header = __get_exception_header_from_ue (exc);
// If we haven't been caught by a foreign handler, then this is
// some sort of unwind error. In that case just die immediately.
// _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 (header->exceptionDestructor)
header->exceptionDestructor (header + 1);
__cxa_free_exception (header + 1);
}
extern "C" void
__cxa_throw (void *obj, std::type_info *tinfo, void (*dest) (void *))
{
__cxa_exception *header = __get_exception_header_from_obj (obj);
header->exceptionType = tinfo;
header->exceptionDestructor = dest;
header->unexpectedHandler = __unexpected_handler;
header->terminateHandler = __terminate_handler;
header->unwindHeader.exception_class = __gxx_exception_class;
header->unwindHeader.exception_cleanup = __gxx_exception_cleanup;
__cxa_eh_globals *globals = __cxa_get_globals ();
globals->uncaughtExceptions += 1;
#ifdef _GLIBCPP_SJLJ_EXCEPTIONS
_Unwind_SjLj_RaiseException (&header->unwindHeader);
#else
_Unwind_RaiseException (&header->unwindHeader);
#endif
// Some sort of unwinding error. Note that terminate is a handler.
__cxa_begin_catch (&header->unwindHeader);
std::terminate ();
}
extern "C" void
__cxa_rethrow ()
{
__cxa_eh_globals *globals = __cxa_get_globals ();
__cxa_exception *header = globals->caughtExceptions;
// Watch for luser rethrowing with no active exception.
if (header)
{
// Tell __cxa_end_catch this is a rethrow.
if (header->unwindHeader.exception_class != __gxx_exception_class)
globals->caughtExceptions = 0;
else
header->handlerCount = -header->handlerCount;
#ifdef _GLIBCPP_SJLJ_EXCEPTIONS
_Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
#else
#ifdef _LIBUNWIND_STD_ABI
_Unwind_RaiseException (&header->unwindHeader);
#else
_Unwind_Resume_or_Rethrow (&header->unwindHeader);
#endif
#endif
// Some sort of unwinding error. Note that terminate is a handler.
__cxa_begin_catch (&header->unwindHeader);
}
std::terminate ();
}