38f925677d
PR libstdc++/20091
* libsupc++/eh_catch.cc (__cxa_begin_catch): Don't special case
decrement of uncaughtExceptions for rethrow.
From-SVN: r95419
141 lines
4.5 KiB
C++
141 lines
4.5 KiB
C++
// -*- C++ -*- Exception handling routines for catching.
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// Copyright (C) 2001, 2003, 2004 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 2, 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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// You should have received a copy of the GNU General Public License
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// along with GCC; see the file COPYING. If not, write to
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// the Free Software Foundation, 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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#include <cstdlib>
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#include "unwind-cxx.h"
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using namespace __cxxabiv1;
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extern "C" void *
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__cxxabiv1::__cxa_get_exception_ptr(void *exc_obj_in) throw()
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{
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_Unwind_Exception *exceptionObject
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= reinterpret_cast <_Unwind_Exception *>(exc_obj_in);
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__cxa_exception *header = __get_exception_header_from_ue (exceptionObject);
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return header->adjustedPtr;
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}
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extern "C" void *
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__cxxabiv1::__cxa_begin_catch (void *exc_obj_in) throw()
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{
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_Unwind_Exception *exceptionObject
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= reinterpret_cast <_Unwind_Exception *>(exc_obj_in);
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__cxa_eh_globals *globals = __cxa_get_globals ();
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__cxa_exception *prev = globals->caughtExceptions;
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__cxa_exception *header = __get_exception_header_from_ue (exceptionObject);
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// Foreign exceptions can't be stacked here. If the exception stack is
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// empty, then fine. Otherwise we really have no choice but to terminate.
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// Note that this use of "header" is a lie. It's fine so long as we only
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// examine header->unwindHeader though.
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if (header->unwindHeader.exception_class != __gxx_exception_class)
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{
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if (prev != 0)
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std::terminate ();
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// Remember for end_catch and rethrow.
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globals->caughtExceptions = header;
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// ??? No sensible value to return; we don't know what the
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// object is, much less where it is in relation to the header.
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return 0;
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}
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int count = header->handlerCount;
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// Count is less than zero if this exception was rethrown from an
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// immediately enclosing region.
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if (count < 0)
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count = -count + 1;
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else
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count += 1;
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header->handlerCount = count;
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globals->uncaughtExceptions -= 1;
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if (header != prev)
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{
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header->nextException = prev;
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globals->caughtExceptions = header;
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}
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return header->adjustedPtr;
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}
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extern "C" void
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__cxxabiv1::__cxa_end_catch ()
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{
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__cxa_eh_globals *globals = __cxa_get_globals_fast ();
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__cxa_exception *header = globals->caughtExceptions;
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// A rethrow of a foreign exception will be removed from the
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// the exception stack immediately by __cxa_rethrow.
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if (!header)
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return;
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// A foreign exception couldn't have been stacked (see above),
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// so by definition processing must be complete.
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if (header->unwindHeader.exception_class != __gxx_exception_class)
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{
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globals->caughtExceptions = 0;
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_Unwind_DeleteException (&header->unwindHeader);
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return;
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}
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int count = header->handlerCount;
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if (count < 0)
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{
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// This exception was rethrown. Decrement the (inverted) catch
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// count and remove it from the chain when it reaches zero.
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if (++count == 0)
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globals->caughtExceptions = header->nextException;
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}
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else if (--count == 0)
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{
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// Handling for this exception is complete. Destroy the object.
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globals->caughtExceptions = header->nextException;
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_Unwind_DeleteException (&header->unwindHeader);
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return;
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}
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else if (count < 0)
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// A bug in the exception handling library or compiler.
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std::terminate ();
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header->handlerCount = count;
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}
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bool
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std::uncaught_exception() throw()
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{
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__cxa_eh_globals *globals = __cxa_get_globals ();
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return globals->uncaughtExceptions != 0;
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}
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