Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

7 files changed, 817 insertions, 0 deletions

diff --git a/javaunohelper/source/bootstrap.cxx b/javaunohelper/source/bootstrap.cxx
new file mode 100644
index 000000000..1cacea950
--- /dev/null
+++ b/javaunohelper/source/bootstrap.cxx
@@ -0,0 +1,182 @@
+/* -*- 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 <sal/log.hxx>
+
+#include <osl/diagnose.h>
+
+#include <rtl/bootstrap.hxx>
+#include <rtl/string.hxx>
+
+#include <uno/lbnames.h>
+#include <uno/mapping.hxx>
+#include <uno/environment.hxx>
+
+#include <cppuhelper/bootstrap.hxx>
+
+#include <com/sun/star/lang/XComponent.hpp>
+#include <com/sun/star/uno/XComponentContext.hpp>
+
+#if defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-attributes"
+#endif
+#include <jni.h>
+#if defined __clang__
+#pragma clang diagnostic pop
+#endif
+
+#include <jvmaccess/unovirtualmachine.hxx>
+
+#include "juhx-export-functions.hxx"
+#include "vm.hxx"
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+
+namespace javaunohelper
+{
+
+static OUString jstring_to_oustring( jstring jstr, JNIEnv * jni_env )
+{
+    OSL_ASSERT( sizeof (sal_Unicode) == sizeof (jchar) );
+    jsize len = jni_env->GetStringLength( jstr );
+    rtl_uString * ustr =
+        static_cast<rtl_uString *>(std::malloc( sizeof (rtl_uString) + (len * sizeof (sal_Unicode)) ));
+    assert(ustr);
+    jni_env->GetStringRegion( jstr, 0, len, reinterpret_cast<jchar *>(ustr->buffer) );
+    OSL_ASSERT( !jni_env->ExceptionCheck() );
+    ustr->refCount = 1;
+    ustr->length = len;
+    ustr->buffer[ len ] = '\0';
+    return OUString( ustr, SAL_NO_ACQUIRE );
+}
+
+}
+
+
+jobject Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap(
+    JNIEnv * jni_env, SAL_UNUSED_PARAMETER jclass, jstring juno_rc, jobjectArray jpairs,
+    jobject loader )
+{
+    try
+    {
+        if (nullptr != jpairs)
+        {
+            jsize nPos = 0, len = jni_env->GetArrayLength( jpairs );
+            while (nPos < len)
+            {
+                // name
+                jstring jstr = static_cast<jstring>(jni_env->GetObjectArrayElement( jpairs, nPos ));
+                if (jni_env->ExceptionCheck())
+                {
+                    jni_env->ExceptionClear();
+                    throw RuntimeException( "index out of bounds?!" );
+                }
+                if (nullptr != jstr)
+                {
+                    OUString name( ::javaunohelper::jstring_to_oustring( jstr, jni_env ) );
+                    // value
+                    jstr = static_cast<jstring>(jni_env->GetObjectArrayElement( jpairs, nPos +1 ));
+                    if (jni_env->ExceptionCheck())
+                    {
+                        jni_env->ExceptionClear();
+                        throw RuntimeException( "index out of bounds?!" );
+                    }
+                    if (nullptr != jstr)
+                    {
+                        OUString value( ::javaunohelper::jstring_to_oustring( jstr, jni_env ) );
+
+                        // set bootstrap parameter
+                        ::rtl::Bootstrap::set( name, value );
+                    }
+                }
+                nPos += 2;
+            }
+        }
+
+        // bootstrap uno
+        Reference< XComponentContext > xContext;
+        if (nullptr == juno_rc)
+        {
+            xContext = ::cppu::defaultBootstrap_InitialComponentContext();
+        }
+        else
+        {
+            OUString uno_rc( ::javaunohelper::jstring_to_oustring( juno_rc, jni_env ) );
+            xContext = ::cppu::defaultBootstrap_InitialComponentContext( uno_rc );
+        }
+
+        // create vm access
+        ::rtl::Reference< ::jvmaccess::UnoVirtualMachine > vm_access(
+            ::javaunohelper::create_vm_access( jni_env, loader ) );
+        // wrap vm singleton entry
+        xContext = ::javaunohelper::install_vm_singleton( xContext, vm_access );
+
+        // get uno envs
+        OUString cpp_env_name = CPPU_CURRENT_LANGUAGE_BINDING_NAME;
+        OUString java_env_name = UNO_LB_JAVA;
+        Environment java_env, cpp_env;
+        uno_getEnvironment(reinterpret_cast<uno_Environment **>(&cpp_env), cpp_env_name.pData, nullptr);
+        uno_getEnvironment(reinterpret_cast<uno_Environment **>(&java_env), java_env_name.pData, vm_access.get() );
+
+        // map to java
+        Mapping mapping( cpp_env.get(), java_env.get() );
+        if (! mapping.is())
+        {
+            Reference< lang::XComponent > xComp( xContext, UNO_QUERY );
+            if (xComp.is())
+                xComp->dispose();
+            throw RuntimeException("cannot get mapping C++ <-> Java!" );
+        }
+
+        jobject jret = static_cast<jobject>(mapping.mapInterface( xContext.get(), cppu::UnoType<decltype(xContext)>::get() ));
+        jobject jlocal = jni_env->NewLocalRef( jret );
+        jni_env->DeleteGlobalRef( jret );
+
+        return jlocal;
+    }
+    catch (const RuntimeException & exc)
+    {
+        jclass c = jni_env->FindClass( "com/sun/star/uno/RuntimeException" );
+        if (nullptr != c)
+        {
+            SAL_WARN("javaunohelper", "forwarding RuntimeException: " << exc );
+            OString cstr( OUStringToOString(
+                              exc.Message, RTL_TEXTENCODING_JAVA_UTF8 ) );
+            jni_env->ThrowNew( c, cstr.getStr() );
+        }
+    }
+    catch (const Exception & exc)
+    {
+        jclass c = jni_env->FindClass( "com/sun/star/uno/Exception" );
+        if (nullptr != c)
+        {
+            SAL_WARN("javaunohelper",  "forwarding Exception: " << exc );
+            OString cstr( OUStringToOString(
+                              exc.Message, RTL_TEXTENCODING_JAVA_UTF8 ) );
+            jni_env->ThrowNew( c, cstr.getStr() );
+        }
+    }
+
+    return nullptr;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/javaunohelper/source/javaunohelper.cxx b/javaunohelper/source/javaunohelper.cxx
new file mode 100644
index 000000000..8db57c5b7
--- /dev/null
+++ b/javaunohelper/source/javaunohelper.cxx
@@ -0,0 +1,241 @@
+/* -*- 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 <osl/module.hxx>
+
+#include <uno/environment.hxx>
+#include <uno/lbnames.h>
+#include <uno/mapping.hxx>
+
+#include <cppuhelper/factory.hxx>
+
+#include <com/sun/star/lang/XMultiServiceFactory.hpp>
+#include <com/sun/star/registry/XRegistryKey.hpp>
+
+#if defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-attributes"
+#endif
+#include <jni.h>
+#if defined __clang__
+#pragma clang diagnostic pop
+#endif
+
+#include <jvmaccess/unovirtualmachine.hxx>
+
+#include "juhx-export-functions.hxx"
+#include "vm.hxx"
+
+#ifdef DISABLE_DYNLOADING
+#include <osl/thread.h>
+#endif
+
+using namespace ::com::sun::star;
+using namespace ::com::sun::star::uno;
+
+/*
+ * Class:     com_sun_star_comp_helper_SharedLibraryLoader
+ * Method:    component_writeInfo
+ * Signature: (Ljava/lang/String;Lcom/sun/star/lang/XMultiServiceFactory;Lcom/sun/star/registry/XRegistryKey;)Z
+ */
+jboolean Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo(
+    JNIEnv * pJEnv, SAL_UNUSED_PARAMETER jclass, jstring jLibName, jobject jSMgr,
+    jobject jRegKey, jobject loader )
+{
+    bool bRet = false;
+
+    const jchar* pJLibName = pJEnv->GetStringChars(jLibName, nullptr);
+    OUString aLibName(reinterpret_cast<sal_Unicode const *>(pJLibName));
+    pJEnv->ReleaseStringChars(jLibName, pJLibName);
+
+#ifdef DISABLE_DYNLOADING
+    (void) jSMgr;
+    (void) jRegKey;
+    (void) loader;
+
+    fprintf(stderr, "Hmm, %s called for %s\n", __PRETTY_FUNCTION__, OUStringToOString(aLibName, osl_getThreadTextEncoding()).getStr());
+#else
+    osl::Module lib(aLibName, SAL_LOADMODULE_LAZY | SAL_LOADMODULE_GLOBAL);
+    if (lib.is())
+    {
+        // ========================= LATEST VERSION =========================
+        oslGenericFunction pSym = lib.getFunctionSymbol(COMPONENT_GETENV);
+        if (pSym)
+        {
+            Environment java_env, loader_env;
+
+            const char * pEnvTypeName = nullptr;
+            (*reinterpret_cast<component_getImplementationEnvironmentFunc>(pSym))(
+                &pEnvTypeName, reinterpret_cast<uno_Environment **>(&loader_env) );
+            if (! loader_env.is())
+            {
+                OUString aEnvTypeName( OUString::createFromAscii( pEnvTypeName ) );
+                uno_getEnvironment( reinterpret_cast<uno_Environment **>(&loader_env), aEnvTypeName.pData, nullptr );
+            }
+
+            // create vm access
+            ::rtl::Reference< ::jvmaccess::UnoVirtualMachine > vm_access(
+                ::javaunohelper::create_vm_access( pJEnv, loader ) );
+            OUString java_env_name = UNO_LB_JAVA;
+            uno_getEnvironment(
+                reinterpret_cast<uno_Environment **>(&java_env), java_env_name.pData, vm_access.get() );
+
+            pSym = lib.getFunctionSymbol(COMPONENT_WRITEINFO);
+            if (pSym)
+            {
+                if (loader_env.is() && java_env.is())
+                {
+                    Mapping java2dest(java_env.get(), loader_env.get());
+
+                    if ( java2dest.is() )
+                    {
+                        void * pSMgr =
+                            java2dest.mapInterface(
+                                jSMgr, cppu::UnoType<lang::XMultiServiceFactory>::get());
+                        void * pKey =
+                            java2dest.mapInterface(
+                                jRegKey, cppu::UnoType<registry::XRegistryKey>::get());
+
+                        uno_ExtEnvironment * env = loader_env.get()->pExtEnv;
+                        if (pKey)
+                        {
+                            bRet = (*reinterpret_cast<component_writeInfoFunc>(pSym))( pSMgr, pKey );
+
+                            if (env)
+                                (*env->releaseInterface)( env, pKey );
+                        }
+
+                        if (pSMgr && env)
+                            (*env->releaseInterface)( env, pSMgr );
+                    }
+                }
+            }
+        }
+        lib.release();
+    }
+#endif
+    return bRet;
+}
+
+/*
+ * Class:     com_sun_star_comp_helper_SharedLibraryLoader
+ * Method:    component_getFactory
+ * Signature: (Ljava/lang/String;Ljava/lang/String;Lcom/sun/star/lang/XMultiServiceFactory;Lcom/sun/star/registry/XRegistryKey;)Ljava/lang/Object;
+ */
+jobject Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory(
+    JNIEnv * pJEnv, SAL_UNUSED_PARAMETER jclass, jstring jLibName, jstring jImplName,
+    jobject jSMgr, jobject jRegKey, jobject loader )
+{
+    const jchar* pJLibName = pJEnv->GetStringChars(jLibName, nullptr);
+    OUString aLibName(reinterpret_cast<sal_Unicode const *>(pJLibName));
+    pJEnv->ReleaseStringChars(jLibName, pJLibName);
+
+#ifdef DISABLE_DYNLOADING
+    (void) jImplName;
+    (void) jSMgr;
+    (void) jRegKey;
+    (void) loader;
+
+    fprintf(stderr, "Hmm, %s called for %s\n", __PRETTY_FUNCTION__, OUStringToOString(aLibName, osl_getThreadTextEncoding()).getStr());
+#endif
+
+    aLibName += SAL_DLLEXTENSION;
+
+    jobject joSLL_cpp = nullptr;
+
+#ifndef DISABLE_DYNLOADING
+    osl::Module lib(aLibName, SAL_LOADMODULE_LAZY | SAL_LOADMODULE_GLOBAL);
+    if (lib.is())
+    {
+        // ========================= LATEST VERSION =========================
+        oslGenericFunction pSym = lib.getFunctionSymbol(COMPONENT_GETENV);
+        if (pSym)
+        {
+            Environment java_env, loader_env;
+
+            const char * pEnvTypeName = nullptr;
+            (*reinterpret_cast<component_getImplementationEnvironmentFunc>(pSym))(
+                &pEnvTypeName, reinterpret_cast<uno_Environment **>(&loader_env) );
+
+            if (! loader_env.is())
+            {
+                OUString aEnvTypeName( OUString::createFromAscii( pEnvTypeName ) );
+                uno_getEnvironment( reinterpret_cast<uno_Environment **>(&loader_env), aEnvTypeName.pData, nullptr );
+            }
+
+            // create vm access
+            ::rtl::Reference< ::jvmaccess::UnoVirtualMachine > vm_access(
+                ::javaunohelper::create_vm_access( pJEnv, loader ) );
+            OUString java_env_name = UNO_LB_JAVA;
+            uno_getEnvironment(
+                reinterpret_cast<uno_Environment **>(&java_env), java_env_name.pData, vm_access.get() );
+
+            pSym = lib.getFunctionSymbol(COMPONENT_GETFACTORY);
+            if (pSym)
+            {
+                if (loader_env.is() && java_env.is())
+                {
+                    Mapping java2dest( java_env.get(), loader_env.get() );
+                    Mapping dest2java( loader_env.get(), java_env.get() );
+
+                    if (dest2java.is() && java2dest.is())
+                    {
+                        void * pSMgr =
+                            java2dest.mapInterface(
+                                jSMgr, cppu::UnoType<lang::XMultiServiceFactory>::get());
+                        void * pKey =
+                            java2dest.mapInterface(
+                                jRegKey, cppu::UnoType<registry::XRegistryKey>::get());
+
+                        const char* pImplName = pJEnv->GetStringUTFChars( jImplName, nullptr );
+
+                        void * pSSF = (*reinterpret_cast<component_getFactoryFunc>(pSym))(
+                            pImplName, pSMgr, pKey );
+
+                        pJEnv->ReleaseStringUTFChars( jImplName, pImplName );
+
+                        uno_ExtEnvironment * env = loader_env.get()->pExtEnv;
+
+                        if (pKey && env)
+                            (*env->releaseInterface)( env, pKey );
+                        if (pSMgr && env)
+                            (*env->releaseInterface)( env, pSMgr );
+
+                        if (pSSF)
+                        {
+                            jobject jglobal = static_cast<jobject>(dest2java.mapInterface(
+                                pSSF, cppu::UnoType<XInterface>::get()));
+                            joSLL_cpp = pJEnv->NewLocalRef( jglobal );
+                            pJEnv->DeleteGlobalRef( jglobal );
+                            if (env)
+                                (*env->releaseInterface)( env, pSSF );
+                        }
+                    }
+                }
+            }
+        }
+        lib.release();
+    }
+#endif
+    return joSLL_cpp;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/javaunohelper/source/juhx-export-functions.hxx b/javaunohelper/source/juhx-export-functions.hxx
new file mode 100644
index 000000000..569822f2c
--- /dev/null
+++ b/javaunohelper/source/juhx-export-functions.hxx
@@ -0,0 +1,44 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_JAVAUNOHELPER_SOURCE_JUHX_EXPORT_FUNCTIONS_HXX
+#define INCLUDED_JAVAUNOHELPER_SOURCE_JUHX_EXPORT_FUNCTIONS_HXX
+
+#include <sal/config.h>
+
+#include <sal/types.h>
+
+#include "juhx-export-types.hxx"
+
+extern "C" {
+
+SAL_JNI_EXPORT javaunohelper::detail::Func_bootstrap
+Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap;
+
+SAL_JNI_EXPORT javaunohelper::detail::Func_getFactory
+Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory;
+
+SAL_JNI_EXPORT javaunohelper::detail::Func_writeInfo
+Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo;
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/javaunohelper/source/juhx-export-types.hxx b/javaunohelper/source/juhx-export-types.hxx
new file mode 100644
index 000000000..8e2783452
--- /dev/null
+++ b/javaunohelper/source/juhx-export-types.hxx
@@ -0,0 +1,52 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_JAVAUNOHELPER_SOURCE_JUHX_EXPORT_TYPES_HXX
+#define INCLUDED_JAVAUNOHELPER_SOURCE_JUHX_EXPORT_TYPES_HXX
+
+#include <sal/config.h>
+
+#include <jni.h>
+
+#if defined DISABLE_DYNLOADING
+#define JAVAUNOHELPER_DETAIL_CALLCONV JNICALL
+#else
+#define JAVAUNOHELPER_DETAIL_CALLCONV
+#endif
+
+extern "C" {
+
+namespace javaunohelper::detail {
+
+typedef jobject JAVAUNOHELPER_DETAIL_CALLCONV Func_bootstrap(
+    JNIEnv *_env, jclass, jstring, jobjectArray, jobject);
+
+typedef jobject JAVAUNOHELPER_DETAIL_CALLCONV Func_getFactory(
+    JNIEnv *, jclass, jstring, jstring, jobject, jobject, jobject);
+
+typedef jboolean JAVAUNOHELPER_DETAIL_CALLCONV Func_writeInfo(
+    JNIEnv *, jclass, jstring, jobject, jobject, jobject);
+
+}
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/javaunohelper/source/preload.cxx b/javaunohelper/source/preload.cxx
new file mode 100644
index 000000000..f73b44b34
--- /dev/null
+++ b/javaunohelper/source/preload.cxx
@@ -0,0 +1,130 @@
+/* -*- 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>
+
+#if defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-attributes"
+#endif
+#include <jni.h>
+#if defined __clang__
+#pragma clang diagnostic pop
+#endif
+
+#include <rtl/ustring.hxx>
+#include <osl/module.hxx>
+
+#include "juhx-export-types.hxx"
+
+// In retrospect, the reason to create a juh wrapper around the juhx library was
+// probably because java.lang.System.loadLibrary uses RTLD_LOCAL, so uniqueness
+// of GCC RTTI symbols needed for exception handling would not be guaranteed.
+
+#if ! defined SAL_DLLPREFIX
+#define SAL_DLLPREFIX ""
+#endif
+
+
+extern "C"
+{
+
+static javaunohelper::detail::Func_writeInfo * s_writeInfo;
+static javaunohelper::detail::Func_getFactory * s_getFactory;
+static javaunohelper::detail::Func_bootstrap * s_bootstrap;
+static bool s_inited = false;
+
+extern "C" { static void thisModule() {} }
+
+
+static bool inited_juhx( JNIEnv * jni_env )
+{
+    if (s_inited)
+        return true;
+    osl::Module aModule;
+    if (!aModule.loadRelative(&thisModule, SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION, SAL_LOADMODULE_LAZY | SAL_LOADMODULE_GLOBAL))
+    {
+        jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
+        jni_env->ThrowNew(
+            c, "error loading " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
+        return false;
+    }
+    else
+    {
+        OUString symbol =
+              "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo";
+        s_writeInfo = reinterpret_cast<javaunohelper::detail::Func_writeInfo *>(aModule.getFunctionSymbol(symbol));
+        symbol =
+            "Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory";
+        s_getFactory = reinterpret_cast<javaunohelper::detail::Func_getFactory *>(aModule.getFunctionSymbol(symbol));
+        symbol =
+            "Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap";
+        s_bootstrap =
+            reinterpret_cast<javaunohelper::detail::Func_bootstrap *>(aModule.getFunctionSymbol(symbol));
+
+        if (nullptr == s_writeInfo ||
+            nullptr == s_getFactory ||
+            nullptr == s_bootstrap)
+        {
+            jclass c = jni_env->FindClass( "java/lang/RuntimeException" );
+            jni_env->ThrowNew(
+                c, "error resolving symbols of " SAL_DLLPREFIX "juhx" SAL_DLLEXTENSION "!" );
+            return false;
+        }
+        aModule.release();
+    }
+    s_inited = true;
+    return true;
+}
+
+
+SAL_DLLPUBLIC_EXPORT jboolean JNICALL
+Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1writeInfo(
+    JNIEnv * pJEnv, jclass jClass, jstring jLibName, jobject jSMgr,
+    jobject jRegKey, jobject loader )
+{
+    if (inited_juhx( pJEnv ))
+        return (*s_writeInfo)(
+            pJEnv, jClass, jLibName, jSMgr, jRegKey, loader );
+    return JNI_FALSE;
+}
+
+SAL_DLLPUBLIC_EXPORT jobject JNICALL
+Java_com_sun_star_comp_helper_SharedLibraryLoader_component_1getFactory(
+    JNIEnv * pJEnv, jclass jClass, jstring jLibName, jstring jImplName,
+    jobject jSMgr, jobject jRegKey, jobject loader )
+{
+    if (inited_juhx( pJEnv ))
+        return (*s_getFactory)(
+            pJEnv, jClass, jLibName, jImplName, jSMgr, jRegKey, loader );
+    return nullptr;
+}
+
+SAL_DLLPUBLIC_EXPORT jobject JNICALL
+Java_com_sun_star_comp_helper_Bootstrap_cppuhelper_1bootstrap(
+    JNIEnv * jni_env, jclass jClass, jstring juno_rc, jobjectArray jpairs,
+    jobject loader )
+{
+    if (inited_juhx( jni_env ))
+        return (*s_bootstrap)( jni_env, jClass, juno_rc, jpairs, loader );
+    return nullptr;
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/javaunohelper/source/vm.cxx b/javaunohelper/source/vm.cxx
new file mode 100644
index 000000000..e634c5596
--- /dev/null
+++ b/javaunohelper/source/vm.cxx
@@ -0,0 +1,113 @@
+/* -*- 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 "vm.hxx"
+
+#include <com/sun/star/beans/NamedValue.hpp>
+#include <com/sun/star/lang/XSingleComponentFactory.hpp>
+#include <cppuhelper/compbase.hxx>
+#include <cppuhelper/component_context.hxx>
+#include <cppuhelper/basemutex.hxx>
+#include <jvmaccess/virtualmachine.hxx>
+#include <jvmaccess/unovirtualmachine.hxx>
+
+namespace {
+
+typedef ::cppu::WeakComponentImplHelper<
+    css::lang::XSingleComponentFactory > t_impl;
+
+class SingletonFactory : public cppu::BaseMutex, public t_impl
+{
+    ::rtl::Reference< ::jvmaccess::UnoVirtualMachine > m_vm_access;
+
+protected:
+    virtual void SAL_CALL disposing() override;
+
+public:
+    explicit SingletonFactory( ::rtl::Reference< ::jvmaccess::UnoVirtualMachine > const & vm_access )
+        : t_impl( m_aMutex ),
+          m_vm_access( vm_access )
+        {}
+
+    // XSingleComponentFactory impl
+    virtual css::uno::Reference< css::uno::XInterface > SAL_CALL createInstanceWithContext(
+        css::uno::Reference< css::uno::XComponentContext > const & xContext ) override;
+    virtual css::uno::Reference< css::uno::XInterface > SAL_CALL createInstanceWithArgumentsAndContext(
+        css::uno::Sequence< css::uno::Any > const & args, css::uno::Reference< css::uno::XComponentContext > const & xContext ) override;
+};
+
+void SingletonFactory::disposing()
+{
+    m_vm_access.clear();
+}
+
+css::uno::Reference< css::uno::XInterface > SingletonFactory::createInstanceWithContext(
+    css::uno::Reference< css::uno::XComponentContext > const & xContext )
+{
+    sal_Int64 handle = reinterpret_cast< sal_Int64 >( m_vm_access.get() );
+    css::uno::Any arg( css::beans::NamedValue( "UnoVirtualMachine", css::uno::Any( handle ) ) );
+    return xContext->getServiceManager()->createInstanceWithArgumentsAndContext(
+        "com.sun.star.java.JavaVirtualMachine",
+        css::uno::Sequence< css::uno::Any >( &arg, 1 ), xContext );
+}
+
+css::uno::Reference< css::uno::XInterface > SingletonFactory::createInstanceWithArgumentsAndContext(
+    css::uno::Sequence< css::uno::Any > const & args, css::uno::Reference< css::uno::XComponentContext > const & xContext )
+{
+    return xContext->getServiceManager()->createInstanceWithArgumentsAndContext(
+        "com.sun.star.java.JavaVirtualMachine",
+        args, xContext );
+}
+
+}
+
+namespace javaunohelper {
+
+::rtl::Reference< ::jvmaccess::UnoVirtualMachine > create_vm_access(
+    JNIEnv * jni_env, jobject loader )
+{
+    JavaVM * vm;
+    jni_env->GetJavaVM( &vm );
+    try {
+        return new ::jvmaccess::UnoVirtualMachine(
+            new ::jvmaccess::VirtualMachine(
+                vm, JNI_VERSION_1_2, false, jni_env ),
+            loader );
+    } catch ( ::jvmaccess::UnoVirtualMachine::CreationException & ) {
+        throw css::uno::RuntimeException( "jvmaccess::UnoVirtualMachine::CreationException occurred" );
+    }
+}
+
+css::uno::Reference< css::uno::XComponentContext > install_vm_singleton(
+    css::uno::Reference< css::uno::XComponentContext > const & xContext,
+    ::rtl::Reference< ::jvmaccess::UnoVirtualMachine > const & vm_access )
+{
+    css::uno::Reference< css::lang::XSingleComponentFactory > xFac( new SingletonFactory( vm_access ) );
+    ::cppu::ContextEntry_Init entry(
+        "/singletons/com.sun.star.java.theJavaVirtualMachine",
+        css::uno::Any( xFac ), true );
+    return ::cppu::createComponentContext( &entry, 1, xContext );
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/javaunohelper/source/vm.hxx b/javaunohelper/source/vm.hxx
new file mode 100644
index 000000000..6681dfffa
--- /dev/null
+++ b/javaunohelper/source/vm.hxx
@@ -0,0 +1,55 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_JAVAUNOHELPER_SOURCE_VM_HXX
+#define INCLUDED_JAVAUNOHELPER_SOURCE_VM_HXX
+
+#include <sal/config.h>
+
+#if defined __clang__
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-attributes"
+#endif
+#include <jni.h>
+#if defined __clang__
+#pragma clang diagnostic pop
+#endif
+
+#include <com/sun/star/uno/Reference.hxx>
+#include <rtl/ref.hxx>
+
+namespace com::sun::star::uno { class XComponentContext; }
+namespace jvmaccess { class UnoVirtualMachine; }
+
+namespace javaunohelper {
+
+::rtl::Reference< ::jvmaccess::UnoVirtualMachine > create_vm_access(
+    JNIEnv * jni_env, jobject loader );
+
+css::uno::Reference< css::uno::XComponentContext >
+install_vm_singleton(
+    css::uno::Reference< css::uno::XComponentContext >
+    const & xContext,
+    ::rtl::Reference< ::jvmaccess::UnoVirtualMachine > const & vm_access );
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */