javaunohelper/source/preload.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 <sal/config.h>
  21
  22 #include <jni.h>
  23
  24 #include <rtl/ustring.hxx>
  25 #include <osl/module.hxx>
  26
  27 #include "juhx-export-types.hxx"
  28
  29 // In retrospect, the reason to create a juh wrapper around the juhx library was
  30 // probably because java.lang.System.loadLibrary uses RTLD_LOCAL, so uniqueness
  31 // of GCC RTTI symbols needed for exception handling would not be guaranteed.
  32
  33 #if ! defined SAL_DLLPREFIX
  34 #define SAL_DLLPREFIX ""
  35 #endif
  36
  37
  38 extern "C"
  39 {
  40
  41 static javaunohelper::detail::Func_writeInfo * s_writeInfo;
  42 static javaunohelper::detail::Func_getFactory * s_getFactory;
  43 static javaunohelper::detail::Func_bootstrap * s_bootstrap;
  44 static bool s_inited = false;
  45
  46 extern "C" { static void thisModule() {} }
  47
  48
  49 static bool inited_juhx( JNIEnv * jni_env )
  50 {
  51     if (s_inited)
  52         return true;
  53     osl::Module aModule;
  54     if (!aModule.loadRelative(&thisModule, SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION, SAL_LOADMODULE_LAZY | SAL_LOADMODULE_GLOBAL))
  55     {
  56         jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
  57         jni_env->ThrowNew(
  58             c, "error loading " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
  59         return false;
  60     }
  61     else
  62     {
  63         OUString symbol =
  64               "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo";
  65         s_writeInfo = reinterpret_cast<javaunohelper::detail::Func_writeInfo *>(aModule.getFunctionSymbol(symbol));
  66         symbol =
  67             "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory";
  68         s_getFactory = reinterpret_cast<javaunohelper::detail::Func_getFactory *>(aModule.getFunctionSymbol(symbol));
  69         symbol =
  70             "Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap";
  71         s_bootstrap =
  72             reinterpret_cast<javaunohelper::detail::Func_bootstrap *>(aModule.getFunctionSymbol(symbol));
  73
  74         if (nullptr == s_writeInfo ||
  75             nullptr == s_getFactory ||
  76             nullptr == s_bootstrap)
  77         {
  78             jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
  79             jni_env->ThrowNew(
  80                 c, "error resolving symbols of " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
  81             return false;
  82         }
  83         aModule.release();
  84     }
  85     s_inited = true;
  86     return true;
  87 }
  88
  89
  90 SAL_DLLPUBLIC_EXPORT jboolean JNICALL
  91 Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo(
  92     JNIEnv * pJEnv, jclass jClass, jstring jLibName, jobject jSMgr,
  93     jobject jRegKey, jobject loader )
  94 {
  95     if (inited_juhx( pJEnv ))
  96         return (*s_writeInfo)(
  97             pJEnv, jClass, jLibName, jSMgr, jRegKey, loader );
  98     return JNI_FALSE;
  99 }
 100
 101 SAL_DLLPUBLIC_EXPORT jobject JNICALL
 102 Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory(
 103     JNIEnv * pJEnv, jclass jClass, jstring jLibName, jstring jImplName,
 104     jobject jSMgr, jobject jRegKey, jobject loader )
 105 {
 106     if (inited_juhx( pJEnv ))
 107         return (*s_getFactory)(
 108             pJEnv, jClass, jLibName, jImplName, jSMgr, jRegKey, loader );
 109     return nullptr;
 110 }
 111
 112 SAL_DLLPUBLIC_EXPORT jobject JNICALL
 113 Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap(
 114     JNIEnv * jni_env, jclass jClass, jstring juno_rc, jobjectArray jpairs,
 115     jobject loader )
 116 {
 117     if (inited_juhx( jni_env ))
 118         return (*s_bootstrap)( jni_env, jClass, juno_rc, jpairs, loader );
 119     return nullptr;
 120 }
 121 }
 122
 123 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */