ceph/src/boost/libs/dll/include/boost/dll/detail/type_info.hpp

   1 // Copyright 2016 Klemens Morgenstern, Antony Polukhin
   2 //
   3 // Distributed under the Boost Software License, Version 1.0.
   4 // (See accompanying file LICENSE_1_0.txt
   5 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 // For more information, see http://www.boost.org
   8
   9 #ifndef BOOST_DLL_DETAIL_TYPE_INFO_HPP_
  10 #define BOOST_DLL_DETAIL_TYPE_INFO_HPP_
  11
  12 #include <typeinfo>
  13 #include <cstring>
  14
  15 namespace boost { namespace dll { namespace detail {
  16
  17 #if defined(BOOST_MSVC) || defined(BOOST_MSVC_VER)
  18
  19 #if defined ( _WIN64 )
  20
  21 template<typename Class, typename Lib, typename Storage>
  22 const std::type_info& load_type_info(Lib & lib, Storage & storage)
  23 {
  24     struct RTTICompleteObjectLocator
  25     {
  26         boost::detail::winapi::DWORD_ signature; //always zero ?
  27         boost::detail::winapi::DWORD_ offset;    //offset of this vtable in the complete class
  28         boost::detail::winapi::DWORD_ cdOffset;  //constructor displacement offset
  29         boost::detail::winapi::DWORD_ pTypeDescriptorOffset; //TypeDescriptor of the complete class
  30         boost::detail::winapi::DWORD_ pClassDescriptorOffset; //describes inheritance hierarchy (ignored)
  31     };
  32
  33     RTTICompleteObjectLocator** vtable_p = &lib.template get<RTTICompleteObjectLocator*>(storage.template get_vtable<Class>());
  34
  35     vtable_p--;
  36     auto vtable = *vtable_p;
  37
  38     auto nat = reinterpret_cast<const char*>(lib.native());
  39
  40     nat += vtable->pTypeDescriptorOffset;
  41
  42     return *reinterpret_cast<const std::type_info*>(nat);
  43
  44 }
  45
  46 #else
  47
  48 template<typename Class, typename Lib, typename Storage>
  49 const std::type_info& load_type_info(Lib & lib, Storage & storage)
  50 {
  51     struct RTTICompleteObjectLocator
  52     {
  53         boost::detail::winapi::DWORD_ signature; //always zero ?
  54         boost::detail::winapi::DWORD_ offset;    //offset of this vtable in the complete class
  55         boost::detail::winapi::DWORD_ cdOffset;  //constructor displacement offset
  56         const std::type_info* pTypeDescriptor; //TypeDescriptor of the complete class
  57         void* pClassDescriptor; //describes inheritance hierarchy (ignored)
  58     };
  59
  60     RTTICompleteObjectLocator** vtable_p = &lib.template get<RTTICompleteObjectLocator*>(storage.template get_vtable<Class>());
  61
  62     vtable_p--;
  63     auto vtable = *vtable_p;
  64     return *vtable->pTypeDescriptor;
  65
  66 }
  67
  68 #endif //_WIN64
  69
  70 #else
  71
  72 template<typename Class, typename Lib, typename Storage>
  73 const std::type_info& load_type_info(Lib & lib, Storage & storage)
  74 {
  75     return lib.template get<const std::type_info>(storage.template get_type_info<Class>());
  76
  77 }
  78
  79 #endif
  80
  81
  82 }}}
  83 #endif /* BOOST_DLL_DETAIL_TYPE_INFO_HPP_ */