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281 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/config.h>
#include <cassert>
#include <memory>
#include <typeinfo>
#include <unordered_map>
#include <utility>
#include <vector>
#include <dlfcn.h>
#include <osl/mutex.hxx>
#include <rtl/instance.hxx>
#include <rtl/strbuf.hxx>
#include <rtl/ustring.hxx>
#include <sal/log.hxx>
#include <typelib/typedescription.h>
#include "rtti.hxx"
#include "share.hxx"
namespace {
class Generated {
public:
virtual ~Generated() {};
virtual std::type_info * get() const = 0;
};
class GeneratedPlain: public Generated {
public:
GeneratedPlain(std::unique_ptr<std::type_info> && info): info_(std::move(info)) {};<--- Class 'GeneratedPlain' has a constructor with 1 argument that is not explicit. [+]Class 'GeneratedPlain' has a constructor with 1 argument that is not explicit. Such constructors should in general be explicit for type safety reasons. Using the explicit keyword in the constructor means some mistakes when using the class can be avoided.
std::type_info * get() const override { return info_.get(); }
private:
std::unique_ptr<std::type_info> info_;
};
class GeneratedPad: public Generated {
public:
public:
GeneratedPad(std::unique_ptr<char[]> && pad): pad_(std::move(pad)) {};<--- Class 'GeneratedPad' has a constructor with 1 argument that is not explicit. [+]Class 'GeneratedPad' has a constructor with 1 argument that is not explicit. Such constructors should in general be explicit for type safety reasons. Using the explicit keyword in the constructor means some mistakes when using the class can be avoided.
~GeneratedPad() override { get()->~type_info(); }
std::type_info * get() const override final
{ return reinterpret_cast<std::type_info *>(pad_.get()); }
private:
std::unique_ptr<char[]> pad_;
};
class RTTI
{
typedef std::unordered_map< OUString, std::type_info * > t_rtti_map;
osl::Mutex m_mutex;
t_rtti_map m_rttis;
std::vector<OString> m_rttiNames;
std::unordered_map<OUString, std::unique_ptr<Generated>> m_generatedRttis;
#if !defined ANDROID
void * m_hApp;
#endif
public:
RTTI();
~RTTI();
std::type_info * getRTTI(typelib_TypeDescription const &);
};
RTTI::RTTI()
#if !defined ANDROID
: m_hApp( dlopen( nullptr, RTLD_LAZY ) )
#endif
{
}
RTTI::~RTTI()
{
#if !defined ANDROID
dlclose( m_hApp );
#endif
}
std::type_info * RTTI::getRTTI(typelib_TypeDescription const & pTypeDescr)
{
std::type_info * rtti;
OUString const & unoName = OUString::unacquired(&pTypeDescr.pTypeName);
osl::MutexGuard guard( m_mutex );
t_rtti_map::const_iterator iFind( m_rttis.find( unoName ) );
if (iFind == m_rttis.end())
{
// RTTI symbol
OStringBuffer buf( 64 );
buf.append( "_ZTIN" );
sal_Int32 index = 0;
do
{
OUString token( unoName.getToken( 0, '.', index ) );
buf.append( token.getLength() );
OString c_token( OUStringToOString( token, RTL_TEXTENCODING_ASCII_US ) );
buf.append( c_token );
}
while (index >= 0);
buf.append( 'E' );
OString symName( buf.makeStringAndClear() );
#if !defined ANDROID
rtti = static_cast<std::type_info *>(dlsym( m_hApp, symName.getStr() ));
#else
rtti = static_cast<std::type_info *>(dlsym( RTLD_DEFAULT, symName.getStr() ));
#endif
if (rtti)
{
std::pair< t_rtti_map::iterator, bool > insertion (
m_rttis.insert( t_rtti_map::value_type( unoName, rtti ) ) );
SAL_WARN_IF( !insertion.second, "bridges", "key " << unoName << " already in rtti map" );
}
else
{
// try to lookup the symbol in the generated rtti map
auto iFind2( m_generatedRttis.find( unoName ) );
if (iFind2 == m_generatedRttis.end())
{
// we must generate it !
// symbol and rtti-name is nearly identical,
// the symbol is prefixed with _ZTI
char const * rttiName = symName.getStr() +4;
#if OSL_DEBUG_LEVEL > 1
fprintf( stderr,"generated rtti for %s\n", rttiName );
#endif
std::unique_ptr<Generated> newRtti;
switch (pTypeDescr.eTypeClass) {
case typelib_TypeClass_EXCEPTION:
{
typelib_CompoundTypeDescription const & ctd
= reinterpret_cast<
typelib_CompoundTypeDescription const &>(
pTypeDescr);
if (ctd.pBaseTypeDescription)
{
// ensure availability of base
std::type_info * base_rtti = getRTTI(
ctd.pBaseTypeDescription->aBase);
m_rttiNames.emplace_back(OString(rttiName));
std::unique_ptr<std::type_info> info(
new __cxxabiv1::__si_class_type_info(
m_rttiNames.back().getStr(), static_cast<__cxxabiv1::__class_type_info *>(base_rtti) ));
newRtti.reset(new GeneratedPlain(std::move(info)));
}
else
{
// this class has no base class
m_rttiNames.emplace_back(OString(rttiName));
std::unique_ptr<std::type_info> info(
new __cxxabiv1::__class_type_info(m_rttiNames.back().getStr()));
newRtti.reset(new GeneratedPlain(std::move(info)));
}
break;
}
case typelib_TypeClass_INTERFACE:
{
typelib_InterfaceTypeDescription const & itd
= reinterpret_cast<
typelib_InterfaceTypeDescription const &>(
pTypeDescr);
std::vector<std::type_info *> bases;
for (sal_Int32 i = 0; i != itd.nBaseTypes; ++i) {
bases.push_back(getRTTI(itd.ppBaseTypes[i]->aBase));
}
switch (itd.nBaseTypes) {
case 0:
{
m_rttiNames.emplace_back(OString(rttiName));
std::unique_ptr<std::type_info> info(
new __cxxabiv1::__class_type_info(
m_rttiNames.back().getStr()));
newRtti.reset(new GeneratedPlain(std::move(info)));
break;
}
case 1:
{
m_rttiNames.emplace_back(OString(rttiName));
std::unique_ptr<std::type_info> info(
new __cxxabiv1::__si_class_type_info(
m_rttiNames.back().getStr(),
static_cast<
__cxxabiv1::__class_type_info *>(
bases[0])));
newRtti.reset(new GeneratedPlain(std::move(info)));
break;
}
default:
{
m_rttiNames.emplace_back(OString(rttiName));
auto pad = std::make_unique<char[]>(
sizeof (__cxxabiv1::__vmi_class_type_info)
+ ((itd.nBaseTypes - 1)
* sizeof (
__cxxabiv1::__base_class_type_info)));
__cxxabiv1::__vmi_class_type_info * info
= new(pad.get())
__cxxabiv1::__vmi_class_type_info(
m_rttiNames.back().getStr(),
__cxxabiv1::__vmi_class_type_info::__flags_unknown_mask);
info->__base_count = itd.nBaseTypes;
for (sal_Int32 i = 0; i != itd.nBaseTypes; ++i)
{
info->__base_info[i].__base_type
= static_cast<
__cxxabiv1::__class_type_info *>(
bases[i]);
info->__base_info[i].__offset_flags
= (__cxxabiv1::__base_class_type_info::__public_mask
| ((8 * i) << __cxxabiv1::__base_class_type_info::__offset_shift));
}
newRtti.reset(new GeneratedPad(std::move(pad)));
break;
}
}
break;
}
default:
assert(false); // cannot happen
}
rtti = newRtti->get();<--- Null pointer dereference
if (newRtti) {<--- Assuming that condition 'if(newRtti)' is not redundant
auto insertion (
m_generatedRttis.emplace(unoName, std::move(newRtti)));
SAL_WARN_IF( !insertion.second, "bridges", "key " << unoName << " already in generated rtti map" );
}
}
else // taking already generated rtti
{
rtti = iFind2->second->get();
}
}
}
else
{
rtti = iFind->second;
}
return rtti;
}
struct theRttiFactory: public rtl::Static<RTTI, theRttiFactory> {};
}
std::type_info * x86_64::getRtti(typelib_TypeDescription const & type) {
return theRttiFactory::get().getRTTI(type);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|