libstdc++-v3/libsupc++/class_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 __class_type_info::
  35 ~__class_type_info ()
  36 {}
  37
  38 bool __class_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;
  45   if (outer >= 4)
  46     // Neither `A' nor `A *'.
  47     return false;
  48   return thr_type->__do_upcast (this, thr_obj);
  49 }
  50
  51 bool __class_type_info::
  52 __do_upcast (const __class_type_info *dst_type,
  53              void **obj_ptr) const
  54 {
  55   __upcast_result result (__vmi_class_type_info::__flags_unknown_mask);
  56
  57   __do_upcast (dst_type, *obj_ptr, result);
  58   if (!contained_public_p (result.part2dst))
  59     return false;
  60   *obj_ptr = const_cast <void *> (result.dst_ptr);
  61   return true;
  62 }
  63
  64 __class_type_info::__sub_kind __class_type_info::
  65 __do_find_public_src (ptrdiff_t,
  66                       const void *obj_ptr,
  67                       const __class_type_info *,
  68                       const void *src_ptr) const
  69 {
  70   if (src_ptr == obj_ptr)
  71     // Must be our type, as the pointers match.
  72     return __contained_public;
  73   return __not_contained;
  74 }
  75
  76 bool __class_type_info::
  77 __do_dyncast (ptrdiff_t,
  78               __sub_kind access_path,
  79               const __class_type_info *dst_type,
  80               const void *obj_ptr,
  81               const __class_type_info *src_type,
  82               const void *src_ptr,
  83               __dyncast_result &__restrict result) const
  84 {
  85   if (obj_ptr == src_ptr && *this == *src_type)
  86     {
  87       // The src object we started from. Indicate how we are accessible from
  88       // the most derived object.
  89       result.whole2src = access_path;
  90       return false;
  91     }
  92   if (*this == *dst_type)
  93     {
  94       result.dst_ptr = obj_ptr;
  95       result.whole2dst = access_path;
  96       result.dst2src = __not_contained;
  97       return false;
  98     }
  99   return false;
 100 }
 101
 102 bool __class_type_info::
 103 __do_upcast (const __class_type_info *dst, const void *obj,
 104              __upcast_result &__restrict result) const
 105 {
 106   if (*this == *dst)
 107     {
 108       result.dst_ptr = obj;
 109       result.base_type = nonvirtual_base_type;
 110       result.part2dst = __contained_public;
 111       return true;
 112     }
 113   return false;
 114 }
 115
 116 }