libstdc++-v3/libsupc++/eh_type.cc

   1 // -*- C++ -*- Exception handling routines for catching.
   2 // Copyright (C) 2001-2018 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25
  26 #include <typeinfo>
  27 #include <cxxabi.h>
  28 #include "unwind-cxx.h"
  29
  30 namespace __cxxabiv1
  31 {
  32
  33 // Returns the type_info for the currently handled exception [15.3/8], or
  34 // null if there is none.
  35 extern "C"
  36 std::type_info *__cxa_current_exception_type () _GLIBCXX_NOTHROW
  37 {
  38   __cxa_eh_globals *globals = __cxa_get_globals ();
  39   __cxa_exception *header = globals->caughtExceptions;
  40   if (header)
  41     {
  42       if (__is_dependent_exception (header->unwindHeader.exception_class))
  43         {
  44           __cxa_dependent_exception *de =
  45             __get_dependent_exception_from_ue (&header->unwindHeader);
  46           header = __get_exception_header_from_obj (de->primaryException);
  47         }
  48       return header->exceptionType;
  49     }
  50   else
  51     return 0;
  52 }
  53
  54 } // namespace __cxxabiv1