1 // -*- C++ -*- Exception handling routines for throwing. 2 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 3 // 2011, 2012 Free Software Foundation, Inc. 4 // 5 // This file is part of GCC. 6 // 7 // GCC is free software; you can redistribute it and/or modify 8 // it under the terms of the GNU General Public License as published by 9 // the Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 // 12 // GCC is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 // 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 #include <bits/c++config.h> 27 #include "unwind-cxx.h" 28 29 using namespace __cxxabiv1; 30 31 32 static void 33 __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc) 34 { 35 // This cleanup is set only for primaries. 36 __cxa_refcounted_exception *header 37 = __get_refcounted_exception_header_from_ue (exc); 38 39 // We only want to be called through _Unwind_DeleteException. 40 // _Unwind_DeleteException in the HP-UX IA64 libunwind library 41 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT 42 // like the GCC _Unwind_DeleteException function does. 43 if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON) 44 __terminate (header->exc.terminateHandler); 45 46 #if ATOMIC_INT_LOCK_FREE > 1 47 if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0) 48 { 49 #endif 50 if (header->exc.exceptionDestructor) 51 header->exc.exceptionDestructor (header + 1); 52 53 __cxa_free_exception (header + 1); 54 #if ATOMIC_INT_LOCK_FREE > 1 55 } 56 #endif 57 } 58 59 60 extern "C" void 61 __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo, 62 void (_GLIBCXX_CDTOR_CALLABI *dest) (void *)) 63 { 64 __cxa_eh_globals *globals = __cxa_get_globals (); 65 globals->uncaughtExceptions += 1; 66 67 // Definitely a primary. 68 __cxa_refcounted_exception *header 69 = __get_refcounted_exception_header_from_obj (obj); 70 header->referenceCount = 1; 71 header->exc.exceptionType = tinfo; 72 header->exc.exceptionDestructor = dest; 73 header->exc.unexpectedHandler = __unexpected_handler; 74 header->exc.terminateHandler = __terminate_handler; 75 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class); 76 header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup; 77 78 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS 79 _Unwind_SjLj_RaiseException (&header->exc.unwindHeader); 80 #else 81 _Unwind_RaiseException (&header->exc.unwindHeader); 82 #endif 83 84 // Some sort of unwinding error. Note that terminate is a handler. 85 __cxa_begin_catch (&header->exc.unwindHeader); 86 std::terminate (); 87 } 88 89 extern "C" void 90 __cxxabiv1::__cxa_rethrow () 91 { 92 __cxa_eh_globals *globals = __cxa_get_globals (); 93 __cxa_exception *header = globals->caughtExceptions; 94 95 globals->uncaughtExceptions += 1; 96 97 // Watch for luser rethrowing with no active exception. 98 if (header) 99 { 100 // Tell __cxa_end_catch this is a rethrow. 101 if (!__is_gxx_exception_class(header->unwindHeader.exception_class)) 102 globals->caughtExceptions = 0; 103 else 104 header->handlerCount = -header->handlerCount; 105 106 #ifdef _GLIBCXX_SJLJ_EXCEPTIONS 107 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader); 108 #else 109 #if defined(_LIBUNWIND_STD_ABI) 110 _Unwind_RaiseException (&header->unwindHeader); 111 #else 112 _Unwind_Resume_or_Rethrow (&header->unwindHeader); 113 #endif 114 #endif 115 116 // Some sort of unwinding error. Note that terminate is a handler. 117 __cxa_begin_catch (&header->unwindHeader); 118 } 119 std::terminate (); 120 } 121