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

   1 // Copyright (C) 1994, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007,
   2 // 2009  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 __class_type_info::
  30 ~__class_type_info ()
  31 {}
  32
  33 bool __class_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;
  40   if (outer >= 4)
  41     // Neither `A' nor `A *'.
  42     return false;
  43   return thr_type->__do_upcast (this, thr_obj);
  44 }
  45
  46 bool __class_type_info::
  47 __do_upcast (const __class_type_info *dst_type,
  48              void **obj_ptr) const
  49 {
  50   __upcast_result result (__vmi_class_type_info::__flags_unknown_mask);
  51
  52   __do_upcast (dst_type, *obj_ptr, result);
  53   if (!contained_public_p (result.part2dst))
  54     return false;
  55   *obj_ptr = const_cast <void *> (result.dst_ptr);
  56   return true;
  57 }
  58
  59 __class_type_info::__sub_kind __class_type_info::
  60 __do_find_public_src (ptrdiff_t,
  61                       const void *obj_ptr,
  62                       const __class_type_info *,
  63                       const void *src_ptr) const
  64 {
  65   if (src_ptr == obj_ptr)
  66     // Must be our type, as the pointers match.
  67     return __contained_public;
  68   return __not_contained;
  69 }
  70
  71 bool __class_type_info::
  72 __do_dyncast (ptrdiff_t,
  73               __sub_kind access_path,
  74               const __class_type_info *dst_type,
  75               const void *obj_ptr,
  76               const __class_type_info *src_type,
  77               const void *src_ptr,
  78               __dyncast_result &__restrict result) const
  79 {
  80   if (obj_ptr == src_ptr && *this == *src_type)
  81     {
  82       // The src object we started from. Indicate how we are accessible from
  83       // the most derived object.
  84       result.whole2src = access_path;
  85       return false;
  86     }
  87   if (*this == *dst_type)
  88     {
  89       result.dst_ptr = obj_ptr;
  90       result.whole2dst = access_path;
  91       result.dst2src = __not_contained;
  92       return false;
  93     }
  94   return false;
  95 }
  96
  97 bool __class_type_info::
  98 __do_upcast (const __class_type_info *dst, const void *obj,
  99              __upcast_result &__restrict result) const
 100 {
 101   if (*this == *dst)
 102     {
 103       result.dst_ptr = obj;
 104       result.base_type = nonvirtual_base_type;
 105       result.part2dst = __contained_public;
 106       return true;
 107     }
 108   return false;
 109 }
 110
 111 }