eh_throw.cc Source File

00001 // -*- C++ -*- Exception handling routines for throwing.
00002 // Copyright (C) 2001 Free Software Foundation, Inc.
00003 //
00004 // This file is part of GNU CC.
00005 //
00006 // GNU CC is free software; you can redistribute it and/or modify
00007 // it under the terms of the GNU General Public License as published by
00008 // the Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 //
00011 // GNU CC is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 //
00016 // You should have received a copy of the GNU General Public License
00017 // along with GNU CC; see the file COPYING.  If not, write to
00018 // the Free Software Foundation, 59 Temple Place - Suite 330,
00019 // Boston, MA 02111-1307, USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 
00031 #include <bits/c++config.h>
00032 #include "unwind-cxx.h"
00033 
00034 
00035 using namespace __cxxabiv1;
00036 
00037 
00038 static void
00039 __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
00040 {
00041   __cxa_exception *header = __get_exception_header_from_ue (exc);
00042 
00043   // If we havn't been caught by a foreign handler, then this is
00044   // some sort of unwind error.  In that case just die immediately.
00045   if (code != _URC_FOREIGN_EXCEPTION_CAUGHT)
00046     __terminate (header->terminateHandler);
00047 
00048   if (header->exceptionDestructor)
00049     header->exceptionDestructor (header + 1);
00050 
00051   __cxa_free_exception (header + 1);
00052 }
00053 
00054 
00055 extern "C" void
00056 __cxa_throw (void *obj, std::type_info *tinfo, void (*dest) (void *))
00057 {
00058   __cxa_exception *header = __get_exception_header_from_obj (obj);
00059   header->exceptionType = tinfo;
00060   header->exceptionDestructor = dest;
00061   header->unexpectedHandler = __unexpected_handler;
00062   header->terminateHandler = __terminate_handler;
00063   header->unwindHeader.exception_class = __gxx_exception_class;
00064   header->unwindHeader.exception_cleanup = __gxx_exception_cleanup;
00065 
00066   __cxa_eh_globals *globals = __cxa_get_globals ();
00067   globals->uncaughtExceptions += 1;
00068 
00069 #ifdef _GLIBCPP_SJLJ_EXCEPTIONS
00070   _Unwind_SjLj_RaiseException (&header->unwindHeader);
00071 #else
00072   _Unwind_RaiseException (&header->unwindHeader);
00073 #endif
00074 
00075   // Some sort of unwinding error.  Note that terminate is a handler.
00076   __cxa_begin_catch (&header->unwindHeader);
00077   std::terminate ();
00078 }
00079 
00080 extern "C" void
00081 __cxa_rethrow ()
00082 {
00083   __cxa_eh_globals *globals = __cxa_get_globals ();
00084   __cxa_exception *header = globals->caughtExceptions;
00085 
00086   // Watch for luser rethrowing with no active exception.
00087   if (header)
00088     {
00089       // Tell __cxa_end_catch this is a rethrow.
00090       header->handlerCount = -header->handlerCount;
00091 
00092 #ifdef _GLIBCPP_SJLJ_EXCEPTIONS
00093       _Unwind_SjLj_RaiseException (&header->unwindHeader);
00094 #else
00095       _Unwind_RaiseException (&header->unwindHeader);
00096 #endif
00097   
00098       // Some sort of unwinding error.  Note that terminate is a handler.
00099       __cxa_begin_catch (&header->unwindHeader);
00100     }
00101   std::terminate ();
00102 }