--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.dynalink/share/classes/jdk/dynalink/LinkerServicesImpl.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * This file is available under and governed by the GNU General Public
+ * License version 2 only, as published by the Free Software Foundation.
+ * However, the following notice accompanied the original version of this
+ * file, and Oracle licenses the original version of this file under the BSD
+ * license:
+ */
+/*
+ Copyright 2009-2013 Attila Szegedi
+
+ Licensed under both the Apache License, Version 2.0 (the "Apache License")
+ and the BSD License (the "BSD License"), with licensee being free to
+ choose either of the two at their discretion.
+
+ You may not use this file except in compliance with either the Apache
+ License or the BSD License.
+
+ If you choose to use this file in compliance with the Apache License, the
+ following notice applies to you:
+
+ You may obtain a copy of the Apache License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied. See the License for the specific language governing
+ permissions and limitations under the License.
+
+ If you choose to use this file in compliance with the BSD License, the
+ following notice applies to you:
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are
+ met:
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+ * Neither the name of the copyright holder nor the names of
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
+ BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package jdk.dynalink;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.invoke.MethodType;
+import java.util.Objects;
+import java.util.function.Supplier;
+import jdk.dynalink.linker.ConversionComparator.Comparison;
+import jdk.dynalink.linker.GuardedInvocation;
+import jdk.dynalink.linker.GuardingDynamicLinker;
+import jdk.dynalink.linker.LinkRequest;
+import jdk.dynalink.linker.LinkerServices;
+import jdk.dynalink.linker.MethodHandleTransformer;
+
+/**
+ * Default implementation of the {@link LinkerServices} interface.
+ */
+final class LinkerServicesImpl implements LinkerServices {
+ private static final ThreadLocal<SecureLookupSupplier> threadLookupSupplier = new ThreadLocal<>();
+
+ private final TypeConverterFactory typeConverterFactory;
+ private final GuardingDynamicLinker topLevelLinker;
+ private final MethodHandleTransformer internalObjectsFilter;
+
+ /**
+ * Creates a new linker services object.
+ *
+ * @param typeConverterFactory the type converter factory exposed by the services.
+ * @param topLevelLinker the top level linker used by the services.
+ * @param internalObjectsFilter a method handle transformer that is supposed to act as the implementation of this
+ * services' {@link #filterInternalObjects(java.lang.invoke.MethodHandle)} method.
+ */
+ LinkerServicesImpl(final TypeConverterFactory typeConverterFactory,
+ final GuardingDynamicLinker topLevelLinker, final MethodHandleTransformer internalObjectsFilter) {
+ this.typeConverterFactory = typeConverterFactory;
+ this.topLevelLinker = topLevelLinker;
+ this.internalObjectsFilter = internalObjectsFilter;
+ }
+
+ @Override
+ public boolean canConvert(final Class<?> from, final Class<?> to) {
+ return typeConverterFactory.canConvert(from, to);
+ }
+
+ @Override
+ public MethodHandle asType(final MethodHandle handle, final MethodType fromType) {
+ return typeConverterFactory.asType(handle, fromType);
+ }
+
+ @Override
+ public MethodHandle getTypeConverter(final Class<?> sourceType, final Class<?> targetType) {
+ return typeConverterFactory.getTypeConverter(sourceType, targetType);
+ }
+
+ @Override
+ public Comparison compareConversion(final Class<?> sourceType, final Class<?> targetType1, final Class<?> targetType2) {
+ return typeConverterFactory.compareConversion(sourceType, targetType1, targetType2);
+ }
+
+ /**
+ * Used to marshal a checked exception out of Supplier.get() in getGuardedInvocation.
+ */
+ private static class LinkerException extends RuntimeException {
+ private static final long serialVersionUID = 1L;
+
+ public LinkerException(final Exception cause) {
+ super(null, cause, true, false);
+ }
+ }
+
+ @Override
+ public GuardedInvocation getGuardedInvocation(final LinkRequest linkRequest) throws Exception {
+ try {
+ return getWithLookupInternal(() -> {
+ try {
+ return topLevelLinker.getGuardedInvocation(linkRequest, this);
+ } catch (final RuntimeException e) {
+ throw e;
+ } catch (final Exception e) {
+ throw new LinkerException(e);
+ }
+ }, linkRequest.getCallSiteDescriptor());
+ } catch (final LinkerException e) {
+ throw (Exception)e.getCause();
+ }
+ }
+
+ @Override
+ public MethodHandle filterInternalObjects(final MethodHandle target) {
+ return internalObjectsFilter != null ? internalObjectsFilter.transform(target) : target;
+ }
+
+ @Override
+ public <T> T getWithLookup(final Supplier<T> operation, final SecureLookupSupplier lookupSupplier) {
+ return getWithLookupInternal(
+ Objects.requireNonNull(operation, "action"),
+ Objects.requireNonNull(lookupSupplier, "lookupSupplier"));
+ }
+
+ private static <T> T getWithLookupInternal(final Supplier<T> operation, final SecureLookupSupplier lookupSupplier) {
+ final SecureLookupSupplier prevLookupSupplier = threadLookupSupplier.get();
+ final boolean differ = prevLookupSupplier != lookupSupplier;
+ if (differ) {
+ threadLookupSupplier.set(lookupSupplier);
+ }
+ try {
+ return operation.get();
+ } finally {
+ if (differ) {
+ threadLookupSupplier.set(prevLookupSupplier);
+ }
+ }
+ }
+
+ static Lookup getCurrentLookup() {
+ final SecureLookupSupplier lookupSupplier = threadLookupSupplier.get();
+ if (lookupSupplier != null) {
+ return lookupSupplier.getLookup();
+ }
+ return MethodHandles.publicLookup();
+ }
+}