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

   1 // Copyright (C) 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007, 2009
   2 // Free Software Foundation
   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 #include "tinfo.h"
  26
  27 namespace __cxxabiv1 {
  28
  29 __pbase_type_info::
  30 ~__pbase_type_info ()
  31 {}
  32
  33 bool __pbase_type_info::
  34 __do_catch (const type_info *thr_type,
  35             void **thr_obj,
  36             unsigned outer) const
  37 {
  38   if (*this == *thr_type)
  39     return true;      // same type
  40   if (typeid (*this) != typeid (*thr_type))
  41     return false;     // not both same kind of pointers
  42
  43   if (!(outer & 1))
  44     // We're not the same and our outer pointers are not all const qualified
  45     // Therefore there must at least be a qualification conversion involved
  46     // But for that to be valid, our outer pointers must be const qualified.
  47     return false;
  48
  49   const __pbase_type_info *thrown_type =
  50     static_cast <const __pbase_type_info *> (thr_type);
  51
  52   if (thrown_type->__flags & ~__flags)
  53     // We're less qualified.
  54     return false;
  55
  56   if (!(__flags & __const_mask))
  57     outer &= ~1;
  58
  59   return __pointer_catch (thrown_type, thr_obj, outer);
  60 }
  61
  62 }