| // -*- C++ -*- Exception handling routines for throwing. |
| // Copyright (C) 2001-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of GCC. |
| // |
| // GCC 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 3, or (at your option) |
| // any later version. |
| // |
| // GCC 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. |
| // |
| // Under Section 7 of GPL version 3, you are granted additional |
| // permissions described in the GCC Runtime Library Exception, version |
| // 3.1, as published by the Free Software Foundation. |
| |
| // You should have received a copy of the GNU General Public License and |
| // a copy of the GCC Runtime Library Exception along with this program; |
| // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| // <http://www.gnu.org/licenses/>. |
| |
| #include <bits/c++config.h> |
| #include "unwind-cxx.h" |
| #include "eh_atomics.h" |
| |
| using namespace __cxxabiv1; |
| |
| |
| static void |
| __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc) |
| { |
| // This cleanup is set only for primaries. |
| __cxa_refcounted_exception *header |
| = __get_refcounted_exception_header_from_ue (exc); |
| |
| // We only want to be called through _Unwind_DeleteException. |
| // _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->exc.terminateHandler); |
| |
| if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount)) |
| { |
| if (header->exc.exceptionDestructor) |
| header->exc.exceptionDestructor (header + 1); |
| |
| __cxa_free_exception (header + 1); |
| } |
| } |
| |
| extern "C" __cxa_refcounted_exception* |
| __cxxabiv1:: |
| __cxa_init_primary_exception(void *obj, std::type_info *tinfo, |
| void (_GLIBCXX_CDTOR_CALLABI *dest) (void *)) |
| _GLIBCXX_NOTHROW |
| { |
| __cxa_refcounted_exception *header |
| = __get_refcounted_exception_header_from_obj (obj); |
| header->referenceCount = 0; |
| header->exc.exceptionType = tinfo; |
| header->exc.exceptionDestructor = dest; |
| header->exc.unexpectedHandler = std::get_unexpected (); |
| header->exc.terminateHandler = std::get_terminate (); |
| __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class); |
| header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup; |
| |
| return header; |
| } |
| |
| extern "C" void |
| __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo, |
| void (_GLIBCXX_CDTOR_CALLABI *dest) (void *)) |
| { |
| PROBE2 (throw, obj, tinfo); |
| |
| __cxa_eh_globals *globals = __cxa_get_globals (); |
| globals->uncaughtExceptions += 1; |
| // Definitely a primary. |
| __cxa_refcounted_exception *header = |
| __cxa_init_primary_exception(obj, tinfo, dest); |
| header->referenceCount = 1; |
| |
| #ifdef __USING_SJLJ_EXCEPTIONS__ |
| _Unwind_SjLj_RaiseException (&header->exc.unwindHeader); |
| #else |
| _Unwind_RaiseException (&header->exc.unwindHeader); |
| #endif |
| |
| // Some sort of unwinding error. Note that terminate is a handler. |
| __cxa_begin_catch (&header->exc.unwindHeader); |
| std::terminate (); |
| } |
| |
| extern "C" void |
| __cxxabiv1::__cxa_rethrow () |
| { |
| __cxa_eh_globals *globals = __cxa_get_globals (); |
| __cxa_exception *header = globals->caughtExceptions; |
| |
| globals->uncaughtExceptions += 1; |
| |
| // Watch for luser rethrowing with no active exception. |
| if (header) |
| { |
| // Tell __cxa_end_catch this is a rethrow. |
| if (!__is_gxx_exception_class(header->unwindHeader.exception_class)) |
| globals->caughtExceptions = 0; |
| else |
| { |
| header->handlerCount = -header->handlerCount; |
| // Only notify probe for C++ exceptions. |
| PROBE2 (rethrow, __get_object_from_ambiguous_exception(header), |
| header->exceptionType); |
| } |
| |
| #ifdef __USING_SJLJ_EXCEPTIONS__ |
| _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader); |
| #else |
| #if defined(_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 (); |
| } |