eh_throw.cc revision 169692
1// -*- C++ -*- Exception handling routines for throwing. 2// Copyright (C) 2001, 2003 Free Software Foundation, Inc. 3// 4// This file is part of GCC. 5// 6// GCC is free software; you can redistribute it and/or modify 7// it under the terms of the GNU General Public License as published by 8// the Free Software Foundation; either version 2, or (at your option) 9// any later version. 10// 11// GCC is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15// 16// You should have received a copy of the GNU General Public License 17// along with GCC; see the file COPYING. If not, write to 18// the Free Software Foundation, 51 Franklin Street, Fifth Floor, 19// Boston, MA 02110-1301, USA. 20 21// As a special exception, you may use this file as part of a free software 22// library without restriction. Specifically, if other files instantiate 23// templates or use macros or inline functions from this file, or you compile 24// this file and link it with other files to produce an executable, this 25// file does not by itself cause the resulting executable to be covered by 26// the GNU General Public License. This exception does not however 27// invalidate any other reasons why the executable file might be covered by 28// the GNU General Public License. 29 30#include <bits/c++config.h> 31#include "unwind-cxx.h" 32 33using namespace __cxxabiv1; 34 35 36static void 37__gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc) 38{ 39 __cxa_exception *header = __get_exception_header_from_ue (exc); 40 41 // If we haven't been caught by a foreign handler, then this is 42 // some sort of unwind error. In that case just die immediately. 43 // _Unwind_DeleteException in the HP-UX IA64 libunwind library 44 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT 45 // like the GCC _Unwind_DeleteException function does. 46 if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON) 47 __terminate (header->terminateHandler); 48 49 if (header->exceptionDestructor) 50 header->exceptionDestructor (header + 1); 51 52 __cxa_free_exception (header + 1); 53} 54 55 56extern "C" void 57__cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo, 58 void (*dest) (void *)) 59{ 60 __cxa_exception *header = __get_exception_header_from_obj (obj); 61 header->exceptionType = tinfo; 62 header->exceptionDestructor = dest; 63 header->unexpectedHandler = __unexpected_handler; 64 header->terminateHandler = __terminate_handler; 65 __GXX_INIT_EXCEPTION_CLASS(header->unwindHeader.exception_class); 66 header->unwindHeader.exception_cleanup = __gxx_exception_cleanup; 67 68#ifdef _GLIBCXX_SJLJ_EXCEPTIONS 69 _Unwind_SjLj_RaiseException (&header->unwindHeader); 70#else 71 _Unwind_RaiseException (&header->unwindHeader); 72#endif 73 74 // Some sort of unwinding error. Note that terminate is a handler. 75 __cxa_begin_catch (&header->unwindHeader); 76 std::terminate (); 77} 78 79extern "C" void 80__cxxabiv1::__cxa_rethrow () 81{ 82 __cxa_eh_globals *globals = __cxa_get_globals (); 83 __cxa_exception *header = globals->caughtExceptions; 84 85 globals->uncaughtExceptions += 1; 86 87 // Watch for luser rethrowing with no active exception. 88 if (header) 89 { 90 // Tell __cxa_end_catch this is a rethrow. 91 if (!__is_gxx_exception_class(header->unwindHeader.exception_class)) 92 globals->caughtExceptions = 0; 93 else 94 header->handlerCount = -header->handlerCount; 95 96#ifdef _GLIBCXX_SJLJ_EXCEPTIONS 97 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader); 98#else 99#if defined(_LIBUNWIND_STD_ABI) 100 _Unwind_RaiseException (&header->unwindHeader); 101#else 102 _Unwind_Resume_or_Rethrow (&header->unwindHeader); 103#endif 104#endif 105 106 // Some sort of unwinding error. Note that terminate is a handler. 107 __cxa_begin_catch (&header->unwindHeader); 108 } 109 std::terminate (); 110} 111