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 #if defined __clang__
  23 #pragma clang diagnostic push
  24 #pragma clang diagnostic ignored "-Wunknown-attributes"
  25 #endif
  26 #include <jni.h>
  27 #if defined __clang__
  28 #pragma clang diagnostic pop
  29 #endif
  30
  31 #include <rtl/ustring.hxx>
  32 #include <osl/module.hxx>
  33
  34 #include "juhx-export-types.hxx"
  35
  36 // In retrospect, the reason to create a juh wrapper around the juhx library was
  37 // probably because java.lang.System.loadLibrary uses RTLD_LOCAL, so uniqueness
  38 // of GCC RTTI symbols needed for exception handling would not be guaranteed.
  39
  40 #if ! defined SAL_DLLPREFIX
  41 #define SAL_DLLPREFIX ""
  42 #endif
  43
  44
  45 extern "C"
  46 {
  47
  48 static javaunohelper::detail::Func_writeInfo * s_writeInfo;
  49 static javaunohelper::detail::Func_getFactory * s_getFactory;
  50 static javaunohelper::detail::Func_bootstrap * s_bootstrap;
  51 static bool s_inited = false;
  52
  53 extern "C" { static void thisModule() {} }
  54
  55
  56 static bool inited_juhx( JNIEnv * jni_env )
  57 {
  58     if (s_inited)
  59         return true;
  60     osl::Module aModule;
  61     if (!aModule.loadRelative(&thisModule, SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION, SAL_LOADMODULE_LAZY | SAL_LOADMODULE_GLOBAL))
  62     {
  63         jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
  64         jni_env->ThrowNew(
  65             c, "error loading " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
  66         return false;
  67     }
  68     else
  69     {
  70         OUString symbol =
  71               "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo";
  72         s_writeInfo = reinterpret_cast<javaunohelper::detail::Func_writeInfo *>(aModule.getFunctionSymbol(symbol));
  73         symbol =
  74             "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory";
  75         s_getFactory = reinterpret_cast<javaunohelper::detail::Func_getFactory *>(aModule.getFunctionSymbol(symbol));
  76         symbol =
  77             "Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap";
  78         s_bootstrap =
  79             reinterpret_cast<javaunohelper::detail::Func_bootstrap *>(aModule.getFunctionSymbol(symbol));
  80
  81         if (nullptr == s_writeInfo ||
  82             nullptr == s_getFactory ||
  83             nullptr == s_bootstrap)
  84         {
  85             jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
  86             jni_env->ThrowNew(
  87                 c, "error resolving symbols of " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
  88             return false;
  89         }
  90         aModule.release();
  91     }
  92     s_inited = true;
  93     return true;
  94 }
  95
  96
  97 SAL_DLLPUBLIC_EXPORT jboolean JNICALL
  98 Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo(
  99     JNIEnv * pJEnv, jclass jClass, jstring jLibName, jobject jSMgr,
 100     jobject jRegKey, jobject loader )
 101 {
 102     if (inited_juhx( pJEnv ))
 103         return (*s_writeInfo)(
 104             pJEnv, jClass, jLibName, jSMgr, jRegKey, loader );
 105     return JNI_FALSE;
 106 }
 107
 108 SAL_DLLPUBLIC_EXPORT jobject JNICALL
 109 Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory(
 110     JNIEnv * pJEnv, jclass jClass, jstring jLibName, jstring jImplName,
 111     jobject jSMgr, jobject jRegKey, jobject loader )
 112 {
 113     if (inited_juhx( pJEnv ))
 114         return (*s_getFactory)(
 115             pJEnv, jClass, jLibName, jImplName, jSMgr, jRegKey, loader );
 116     return nullptr;
 117 }
 118
 119 SAL_DLLPUBLIC_EXPORT jobject JNICALL
 120 Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap(
 121     JNIEnv * jni_env, jclass jClass, jstring juno_rc, jobjectArray jpairs,
 122     jobject loader )
 123 {
 124     if (inited_juhx( jni_env ))
 125         return (*s_bootstrap)( jni_env, jClass, juno_rc, jpairs, loader );
 126     return nullptr;
 127 }
 128 }
 129
 130 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */