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

   1 // Copyright (C) 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007,
   2 // 2009, 2010
   3 // Free Software Foundation
   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 "tinfo.h"
  27
  28 namespace __cxxabiv1 {
  29
  30 __pbase_type_info::
  31 ~__pbase_type_info ()
  32 {}
  33
  34 bool __pbase_type_info::
  35 __do_catch (const type_info *thr_type,
  36             void **thr_obj,
  37             unsigned outer) const
  38 {
  39   if (*this == *thr_type)
  40     return true;      // same type
  41
  42 #ifdef __GXX_RTTI
  43   if (typeid (*this) != typeid (*thr_type))
  44     return false;     // not both same kind of pointers
  45 #endif
  46
  47   if (!(outer & 1))
  48     // We're not the same and our outer pointers are not all const qualified
  49     // Therefore there must at least be a qualification conversion involved
  50     // But for that to be valid, our outer pointers must be const qualified.
  51     return false;
  52
  53   const __pbase_type_info *thrown_type =
  54     static_cast <const __pbase_type_info *> (thr_type);
  55
  56   if (thrown_type->__flags & ~__flags)
  57     // We're less qualified.
  58     return false;
  59
  60   if (!(__flags & __const_mask))
  61     outer &= ~1;
  62
  63   return __pointer_catch (thrown_type, thr_obj, outer);
  64 }
  65
  66 }