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#include <boost/dll/config.hpp>
15#if defined(_MSC_VER) // MSVC, Clang-cl, and ICC on Windows
16#include <boost/winapi/basic_types.hpp>
17#endif
18
19namespace boost { namespace dll { namespace detail {
20
21#if defined(_MSC_VER) // MSVC, Clang-cl, and ICC on Windows
22
23#if defined ( _WIN64 )
24
25template<typename Class, typename Lib, typename Storage>
26const std::type_info& load_type_info(Lib & lib, Storage & storage)
27{
28 struct RTTICompleteObjectLocator
29 {
30 boost::winapi::DWORD_ signature; //always zero ?
31 boost::winapi::DWORD_ offset; //offset of this vtable in the complete class
32 boost::winapi::DWORD_ cdOffset; //constructor displacement offset
33 boost::winapi::DWORD_ pTypeDescriptorOffset; //TypeDescriptor of the complete class
34 boost::winapi::DWORD_ pClassDescriptorOffset; //describes inheritance hierarchy (ignored)
35 };
36
37 RTTICompleteObjectLocator** vtable_p = &lib.template get<RTTICompleteObjectLocator*>(storage.template get_vtable<Class>());
38
39 vtable_p--;
40 auto vtable = *vtable_p;
41
42 auto nat = reinterpret_cast<const char*>(lib.native());
43
44 nat += vtable->pTypeDescriptorOffset;
45
46 return *reinterpret_cast<const std::type_info*>(nat);
47
48}
49
50#else
51
52template<typename Class, typename Lib, typename Storage>
53const std::type_info& load_type_info(Lib & lib, Storage & storage)
54{
55 struct RTTICompleteObjectLocator
56 {
57 boost::winapi::DWORD_ signature; //always zero ?
58 boost::winapi::DWORD_ offset; //offset of this vtable in the complete class
59 boost::winapi::DWORD_ cdOffset; //constructor displacement offset
60 const std::type_info* pTypeDescriptor; //TypeDescriptor of the complete class
61 void* pClassDescriptor; //describes inheritance hierarchy (ignored)
62 };
63
64 RTTICompleteObjectLocator** vtable_p = &lib.template get<RTTICompleteObjectLocator*>(storage.template get_vtable<Class>());
65
66 vtable_p--;
67 auto vtable = *vtable_p;
68 return *vtable->pTypeDescriptor;
69
70}
71
72#endif //_WIN64
73
74#else
75
76template<typename Class, typename Lib, typename Storage>
77const std::type_info& load_type_info(Lib & lib, Storage & storage)
78{
79 return lib.template get<const std::type_info>(storage.template get_type_info<Class>());
80
81}
82
83#endif
84
85
86}}}
87#endif /* BOOST_DLL_DETAIL_TYPE_INFO_HPP_ */
88

source code of boost/libs/dll/include/boost/dll/detail/type_info.hpp