LibreOffice Module bridges (master) 1
rtti.cxx
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1/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2/*
3 * This file is part of the LibreOffice project.
4 *
5 * This Source Code Form is subject to the terms of the Mozilla Public
6 * License, v. 2.0. If a copy of the MPL was not distributed with this
7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 *
9 * This file incorporates work covered by the following license notice:
10 *
11 * Licensed to the Apache Software Foundation (ASF) under one or more
12 * contributor license agreements. See the NOTICE file distributed
13 * with this work for additional information regarding copyright
14 * ownership. The ASF licenses this file to you under the Apache
15 * License, Version 2.0 (the "License"); you may not use this file
16 * except in compliance with the License. You may obtain a copy of
17 * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 */
19
20#include <sal/config.h>
21
22#include <cassert>
23#include <memory>
24#include <mutex>
25#include <typeinfo>
26#include <unordered_map>
27#include <utility>
28#include <vector>
29
30#include <dlfcn.h>
31
32#include <rtl/strbuf.hxx>
33#include <rtl/ustring.hxx>
34#include <sal/log.hxx>
35#include <typelib/typedescription.h>
36#include <o3tl/string_view.hxx>
37
38#include "rtti.hxx"
39#include "share.hxx"
40
41namespace {
42
43class Generated {
44public:
45 virtual ~Generated() {};
46
47 virtual std::type_info * get() const = 0;
48};
49
50class GeneratedPlain: public Generated {
51public:
52 GeneratedPlain(std::unique_ptr<std::type_info> && info): info_(std::move(info)) {};
53
54 std::type_info * get() const override { return info_.get(); }
55
56private:
57 std::unique_ptr<std::type_info> info_;
58};
59
60class GeneratedPad: public Generated {
61public:
62 GeneratedPad(std::unique_ptr<char[]> && pad): pad_(std::move(pad)) {};
63
64 ~GeneratedPad() override { get()->~type_info(); }
65
66 std::type_info * get() const override final
67 { return reinterpret_cast<std::type_info *>(pad_.get()); }
68
69private:
70 std::unique_ptr<char[]> pad_;
71};
72
73class RTTI
74{
75 typedef std::unordered_map< OUString, std::type_info * > t_rtti_map;
76
77 t_rtti_map m_rttis;
78 std::vector<OString> m_rttiNames;
79 std::unordered_map<OUString, std::unique_ptr<Generated>> m_generatedRttis;
80
81#if !defined ANDROID
82 void * m_hApp;
83#endif
84
85public:
86 RTTI();
87 ~RTTI();
88
89 std::type_info * getRTTI(typelib_TypeDescription const &);
90};
91
92RTTI::RTTI()
93#if !defined ANDROID
94 : m_hApp( dlopen( nullptr, RTLD_LAZY ) )
95#endif
96{
97}
98
99RTTI::~RTTI()
100{
101#if !defined ANDROID
102 dlclose( m_hApp );
103#endif
104}
105
106std::type_info * RTTI::getRTTI(typelib_TypeDescription const & pTypeDescr)
107{
108 OUString const & unoName = OUString::unacquired(&pTypeDescr.pTypeName);
109
110 t_rtti_map::const_iterator iFind( m_rttis.find( unoName ) );
111 if (iFind != m_rttis.end())
112 return iFind->second;
113
114 std::type_info * rtti;
115
116 // RTTI symbol
117 OStringBuffer buf( 64 );
118 buf.append( "_ZTIN" );
119 sal_Int32 index = 0;
120 do
121 {
122 std::u16string_view token( o3tl::getToken(unoName, 0, '.', index ) );
123 buf.append( static_cast<sal_Int32>(token.size()) );
124 OString c_token( OUStringToOString( token, RTL_TEXTENCODING_ASCII_US ) );
125 buf.append( c_token );
126 }
127 while (index >= 0);
128 buf.append( 'E' );
129
130 OString symName( buf.makeStringAndClear() );
131#if !defined ANDROID
132 rtti = static_cast<std::type_info *>(dlsym( m_hApp, symName.getStr() ));
133#else
134 rtti = static_cast<std::type_info *>(dlsym( RTLD_DEFAULT, symName.getStr() ));
135#endif
136
137 if (rtti)
138 {
139 std::pair< t_rtti_map::iterator, bool > insertion (
140 m_rttis.insert( t_rtti_map::value_type( unoName, rtti ) ) );
141 SAL_WARN_IF( !insertion.second, "bridges", "key " << unoName << " already in rtti map" );
142 return rtti;
143 }
144
145 // try to lookup the symbol in the generated rtti map
146 auto iFind2( m_generatedRttis.find( unoName ) );
147 if (iFind2 != m_generatedRttis.end())
148 {
149 // taking already generated rtti
150 rtti = iFind2->second->get();
151 return rtti;
152 }
153
154 // we must generate it !
155 // symbol and rtti-name is nearly identical,
156 // the symbol is prefixed with _ZTI
157 char const * rttiName = symName.getStr() +4;
158
159 SAL_INFO("bridges", "Generated rtti for" << rttiName);
160
161 std::unique_ptr<Generated> newRtti;
162 switch (pTypeDescr.eTypeClass) {
163 case typelib_TypeClass_EXCEPTION:
164 {
165 typelib_CompoundTypeDescription const & ctd
166 = reinterpret_cast<
167 typelib_CompoundTypeDescription const &>(
168 pTypeDescr);
169 if (ctd.pBaseTypeDescription)
170 {
171 // ensure availability of base
172 std::type_info * base_rtti = getRTTI(
173 ctd.pBaseTypeDescription->aBase);
174 m_rttiNames.emplace_back(OString(rttiName));
175 std::unique_ptr<std::type_info> info(
177 m_rttiNames.back().getStr(), static_cast<__cxxabiv1::__class_type_info *>(base_rtti) ));
178 newRtti.reset(new GeneratedPlain(std::move(info)));
179 }
180 else
181 {
182 // this class has no base class
183 m_rttiNames.emplace_back(OString(rttiName));
184 std::unique_ptr<std::type_info> info(
185 new __cxxabiv1::__class_type_info(m_rttiNames.back().getStr()));
186 newRtti.reset(new GeneratedPlain(std::move(info)));
187 }
188 break;
189 }
190 case typelib_TypeClass_INTERFACE:
191 {
192 typelib_InterfaceTypeDescription const & itd
193 = reinterpret_cast<
194 typelib_InterfaceTypeDescription const &>(
195 pTypeDescr);
196 std::vector<std::type_info *> bases;
197 for (sal_Int32 i = 0; i != itd.nBaseTypes; ++i) {
198 bases.push_back(getRTTI(itd.ppBaseTypes[i]->aBase));
199 }
200 switch (itd.nBaseTypes) {
201 case 0:
202 {
203 m_rttiNames.emplace_back(OString(rttiName));
204 std::unique_ptr<std::type_info> info(
206 m_rttiNames.back().getStr()));
207 newRtti.reset(new GeneratedPlain(std::move(info)));
208 break;
209 }
210 case 1:
211 {
212 m_rttiNames.emplace_back(OString(rttiName));
213 std::unique_ptr<std::type_info> info(
215 m_rttiNames.back().getStr(),
216 static_cast<
218 bases[0])));
219 newRtti.reset(new GeneratedPlain(std::move(info)));
220 break;
221 }
222 default:
223 {
224 m_rttiNames.emplace_back(OString(rttiName));
225 auto pad = std::make_unique<char[]>(
227 + ((itd.nBaseTypes - 1)
228 * sizeof (
231 = new(pad.get())
233 m_rttiNames.back().getStr(),
235 info->__base_count = itd.nBaseTypes;
236 for (sal_Int32 i = 0; i != itd.nBaseTypes; ++i)
237 {
239 = static_cast<
241 bases[i]);
245 }
246 newRtti.reset(new GeneratedPad(std::move(pad)));
247 break;
248 }
249 }
250 break;
251 }
252 default:
253 assert(false); // cannot happen
254 }
255 rtti = newRtti->get();
256
257 auto insertion(m_generatedRttis.emplace(unoName, std::move(newRtti)));
258 SAL_WARN_IF( !insertion.second, "bridges", "key " << unoName << " already in generated rtti map" );
259
260 return rtti;
261}
262
263}
264
265std::type_info * x86_64::getRtti(typelib_TypeDescription const & type) {
266 static RTTI theRttiFactory;
267 static std::mutex theMutex;
268 std::lock_guard aGuard(theMutex);
269 return theRttiFactory.getRTTI(type);
270}
271
272/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
const __class_type_info * __base_type
Definition: rtti.h:182
__base_class_type_info __base_info[1]
Definition: rtti.h:351
t_rtti_map m_rttis
t_rtti_map m_generatedRttis
void * m_hApp
#define SAL_WARN_IF(condition, area, stream)
#define SAL_INFO(area, stream)
struct _typelib_TypeDescription typelib_TypeDescription
Definition: msvc/except.hxx:52
int i
index
std::basic_string_view< charT, traits > getToken(std::basic_string_view< charT, traits > sv, charT delimiter, std::size_t &position)
OString OUStringToOString(std::u16string_view str, ConnectionSettings const *settings)
css::uno::Reference< css::linguistic2::XProofreadingIterator > get(css::uno::Reference< css::uno::XComponentContext > const &context)
std::type_info * getRtti(typelib_TypeDescription const &type)
Definition: rtti.cxx:265
ResultType type