bridges/source/cpp_uno/shared/cppinterfaceproxy.cxx

   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 <cppinterfaceproxy.hxx>
  21
  22 #include <bridge.hxx>
  23 #include <utility>
  24 #include <vtablefactory.hxx>
  25
  26 #include <com/sun/star/uno/XInterface.hpp>
  27 #include <typelib/typedescription.h>
  28
  29 #include <cstddef>
  30 #include <memory>
  31 #include <new>
  32
  33 namespace bridges::cpp_uno::shared {
  34
  35 void freeCppInterfaceProxy(uno_ExtEnvironment * pEnv, void * pInterface)
  36 {
  37     CppInterfaceProxy * pThis = CppInterfaceProxy::castInterfaceToProxy(
  38         pInterface);
  39     if (pEnv != pThis->pBridge->getCppEnv()) {
  40         assert(false);
  41     }
  42
  43     (*pThis->pBridge->getUnoEnv()->revokeInterface)(
  44         pThis->pBridge->getUnoEnv(), pThis->pUnoI );
  45     (*pThis->pUnoI->release)( pThis->pUnoI );
  46     ::typelib_typedescription_release(
  47         &pThis->pTypeDescr->aBase );
  48     pThis->pBridge->release();
  49
  50 #if OSL_DEBUG_LEVEL > 1
  51     *(int *)pInterface = 0xdeadbabe;
  52 #endif
  53     pThis->~CppInterfaceProxy();
  54     delete[] reinterpret_cast< char * >(pThis);
  55 }
  56
  57 css::uno::XInterface * CppInterfaceProxy::create(
  58     bridges::cpp_uno::shared::Bridge * pBridge, uno_Interface * pUnoI,
  59     typelib_InterfaceTypeDescription * pTypeDescr, OUString const & rOId)
  60 {
  61     typelib_typedescription_complete(
  62         reinterpret_cast< typelib_TypeDescription ** >(&pTypeDescr));
  63     static bridges::cpp_uno::shared::VtableFactory factory;
  64     const bridges::cpp_uno::shared::VtableFactory::Vtables& rVtables(
  65         factory.getVtables(pTypeDescr));
  66     std::unique_ptr< char[] > pMemory(
  67         new char[
  68             sizeof (CppInterfaceProxy)
  69             + (rVtables.count - 1) * sizeof (void **)]);
  70     new(pMemory.get()) CppInterfaceProxy(pBridge, pUnoI, pTypeDescr, rOId);
  71     CppInterfaceProxy * pProxy = reinterpret_cast< CppInterfaceProxy * >(
  72         pMemory.release());
  73     for (sal_Int32 i = 0; i < rVtables.count; ++i) {
  74         pProxy->vtables[i] = VtableFactory::mapBlockToVtable(
  75             rVtables.blocks[i].start);
  76     }
  77     // coverity[leaked_storage : FALSE] - see freeCppInterfaceProxy
  78     return castProxyToInterface(pProxy);
  79 }
  80
  81 void CppInterfaceProxy::acquireProxy()
  82 {
  83     if (++nRef == 1)
  84     {
  85         // rebirth of proxy zombie
  86         // register at cpp env
  87         void * pThis = castProxyToInterface( this );
  88         (*pBridge->getCppEnv()->registerProxyInterface)(
  89             pBridge->getCppEnv(), &pThis, freeCppInterfaceProxy, oid.pData,
  90             pTypeDescr );
  91         assert(pThis == castProxyToInterface(this));
  92     }
  93 }
  94
  95 void CppInterfaceProxy::releaseProxy()
  96 {
  97     if (! --nRef ) // last release
  98     {
  99         // revoke from cpp env
 100         (*pBridge->getCppEnv()->revokeInterface)(
 101             pBridge->getCppEnv(), castProxyToInterface( this ) );
 102     }
 103 }
 104
 105 CppInterfaceProxy::CppInterfaceProxy(
 106     bridges::cpp_uno::shared::Bridge * pBridge_, uno_Interface * pUnoI_,
 107     typelib_InterfaceTypeDescription * pTypeDescr_, OUString aOId_)
 108     : nRef( 1 )
 109     , pBridge( pBridge_ )
 110     , pUnoI( pUnoI_ )
 111     , pTypeDescr( pTypeDescr_ )
 112     , oid(std::move( aOId_ ))
 113 {
 114     pBridge->acquire();
 115     ::typelib_typedescription_acquire( &pTypeDescr->aBase );
 116     (*pUnoI->acquire)( pUnoI );
 117     (*pBridge->getUnoEnv()->registerInterface)(
 118         pBridge->getUnoEnv(), reinterpret_cast< void ** >( &pUnoI ), oid.pData,
 119         pTypeDescr );
 120 }
 121
 122 CppInterfaceProxy::~CppInterfaceProxy()
 123 {}
 124
 125 css::uno::XInterface * CppInterfaceProxy::castProxyToInterface(
 126     CppInterfaceProxy * pProxy)
 127 {
 128     return reinterpret_cast< css::uno::XInterface * >(
 129         &pProxy->vtables);
 130 }
 131
 132 CppInterfaceProxy * CppInterfaceProxy::castInterfaceToProxy(void * pInterface)
 133 {
 134     // pInterface == &pProxy->vtables (this emulated offsetof is not truly
 135     // portable):
 136     char const * const base = reinterpret_cast< char const * >(16);
 137     std::ptrdiff_t const offset = reinterpret_cast< char const * >(
 138         &reinterpret_cast< CppInterfaceProxy const * >(base)->vtables) - base;
 139     return reinterpret_cast< CppInterfaceProxy * >(
 140         static_cast< char * >(pInterface) - offset);
 141 }
 142
 143 }
 144
 145 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */