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

   1 // Copyright (C) 1994-2017 Free Software Foundation, Inc.
   2 //
   3 // This file is part of GCC.
   4 //
   5 // GCC is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 3, or (at your option)
   8 // any later version.
   9
  10 // GCC is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // Under Section 7 of GPL version 3, you are granted additional
  16 // permissions described in the GCC Runtime Library Exception, version
  17 // 3.1, as published by the Free Software Foundation.
  18
  19 // You should have received a copy of the GNU General Public License and
  20 // a copy of the GCC Runtime Library Exception along with this program;
  21 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22 // <http://www.gnu.org/licenses/>.
  23
  24 #include "tinfo.h"
  25
  26 namespace __cxxabiv1 {
  27
  28 __si_class_type_info::
  29 ~__si_class_type_info ()
  30 {}
  31
  32 __class_type_info::__sub_kind __si_class_type_info::
  33 __do_find_public_src (ptrdiff_t src2dst,
  34                       const void *obj_ptr,
  35                       const __class_type_info *src_type,
  36                       const void *src_ptr) const
  37 {
  38   if (src_ptr == obj_ptr && *this == *src_type)
  39     return __contained_public;
  40   return __base_type->__do_find_public_src (src2dst, obj_ptr, src_type, src_ptr);
  41 }
  42
  43 bool __si_class_type_info::
  44 __do_dyncast (ptrdiff_t src2dst,
  45               __sub_kind access_path,
  46               const __class_type_info *dst_type,
  47               const void *obj_ptr,
  48               const __class_type_info *src_type,
  49               const void *src_ptr,
  50               __dyncast_result &__restrict result) const
  51 {
  52   if (*this == *dst_type)
  53     {
  54       result.dst_ptr = obj_ptr;
  55       result.whole2dst = access_path;
  56       if (src2dst >= 0)
  57         result.dst2src = adjust_pointer <void> (obj_ptr, src2dst) == src_ptr
  58               ? __contained_public : __not_contained;
  59       else if (src2dst == -2)
  60         result.dst2src = __not_contained;
  61       return false;
  62     }
  63   if (obj_ptr == src_ptr && *this == *src_type)
  64     {
  65       // The src object we started from. Indicate how we are accessible from
  66       // the most derived object.
  67       result.whole2src = access_path;
  68       return false;
  69     }
  70   return __base_type->__do_dyncast (src2dst, access_path, dst_type, obj_ptr,
  71                              src_type, src_ptr, result);
  72 }
  73
  74 bool __si_class_type_info::
  75 __do_upcast (const __class_type_info *dst, const void *obj_ptr,
  76              __upcast_result &__restrict result) const
  77 {
  78   if (__class_type_info::__do_upcast (dst, obj_ptr, result))
  79     return true;
  80
  81   return __base_type->__do_upcast (dst, obj_ptr, result);
  82 }
  83
  84 }