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

   1 // Copyright (C) 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007
   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 2, 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 // You should have received a copy of the GNU General Public License
  17 // along with GCC; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  19 // Boston, MA 02110-1301, USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline enums from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 #include "tinfo.h"
  31
  32 namespace __cxxabiv1 {
  33
  34 __pbase_type_info::
  35 ~__pbase_type_info ()
  36 {}
  37
  38 bool __pbase_type_info::
  39 __do_catch (const type_info *thr_type,
  40             void **thr_obj,
  41             unsigned outer) const
  42 {
  43   if (*this == *thr_type)
  44     return true;      // same type
  45   if (typeid (*this) != typeid (*thr_type))
  46     return false;     // not both same kind of pointers
  47
  48   if (!(outer & 1))
  49     // We're not the same and our outer pointers are not all const qualified
  50     // Therefore there must at least be a qualification conversion involved
  51     // But for that to be valid, our outer pointers must be const qualified.
  52     return false;
  53
  54   const __pbase_type_info *thrown_type =
  55     static_cast <const __pbase_type_info *> (thr_type);
  56
  57   if (thrown_type->__flags & ~__flags)
  58     // We're less qualified.
  59     return false;
  60
  61   if (!(__flags & __const_mask))
  62     outer &= ~1;
  63
  64   return __pointer_catch (thrown_type, thr_obj, outer);
  65 }
  66
  67 }