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(BOOST_MSVC) || defined(BOOST_MSVC_VER)
16 #include <boost/winapi/basic_types.hpp>
17 #endif
18
19 namespace boost { namespace dll { namespace detail {
20
21 #if defined(BOOST_MSVC) || defined(BOOST_MSVC_VER)
22
23 #if defined ( _WIN64 )
24
25 template<typename Class, typename Lib, typename Storage>
load_type_info(Lib & lib,Storage & storage)26 const 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
52 template<typename Class, typename Lib, typename Storage>
53 const 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
76 template<typename Class, typename Lib, typename Storage>
77 const 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