author | attila |
Thu, 12 Feb 2015 16:43:33 +0100 | |
changeset 28881 | 0008daeef352 |
parent 27360 | a19c14022fa4 |
child 33003 | f1e00197031f |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file, and Oracle licenses the original version of this file under the BSD |
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* license: |
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*/ |
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/* |
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Copyright 2009-2013 Attila Szegedi |
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|
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Licensed under both the Apache License, Version 2.0 (the "Apache License") |
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and the BSD License (the "BSD License"), with licensee being free to |
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choose either of the two at their discretion. |
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|
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You may not use this file except in compliance with either the Apache |
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License or the BSD License. |
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|
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If you choose to use this file in compliance with the Apache License, the |
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following notice applies to you: |
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|
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You may obtain a copy of the Apache License at |
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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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implied. See the License for the specific language governing |
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permissions and limitations under the License. |
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|
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If you choose to use this file in compliance with the BSD License, the |
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following notice applies to you: |
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|
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are |
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met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the names of |
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contributors may be used to endorse or promote products derived from |
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this software without specific prior written permission. |
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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
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BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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package jdk.internal.dynalink; |
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import java.lang.invoke.MutableCallSite; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.util.ArrayList; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.HashSet; |
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import java.util.LinkedList; |
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import java.util.List; |
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import java.util.Set; |
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import jdk.internal.dynalink.beans.BeansLinker; |
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import jdk.internal.dynalink.linker.GuardingDynamicLinker; |
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import jdk.internal.dynalink.linker.GuardingTypeConverterFactory; |
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import jdk.internal.dynalink.linker.LinkRequest; |
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import jdk.internal.dynalink.linker.LinkerServices; |
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import jdk.internal.dynalink.linker.MethodHandleTransformer; |
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import jdk.internal.dynalink.linker.MethodTypeConversionStrategy; |
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import jdk.internal.dynalink.support.AutoDiscovery; |
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import jdk.internal.dynalink.support.BottomGuardingDynamicLinker; |
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import jdk.internal.dynalink.support.ClassLoaderGetterContextProvider; |
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import jdk.internal.dynalink.support.CompositeGuardingDynamicLinker; |
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import jdk.internal.dynalink.support.CompositeTypeBasedGuardingDynamicLinker; |
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import jdk.internal.dynalink.support.DefaultPrelinkFilter; |
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import jdk.internal.dynalink.support.LinkerServicesImpl; |
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import jdk.internal.dynalink.support.TypeConverterFactory; |
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import jdk.internal.dynalink.support.TypeUtilities; |
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/** |
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* A factory class for creating {@link DynamicLinker}s. The most usual dynamic linker is a linker that is a composition |
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* of all {@link GuardingDynamicLinker}s known and pre-created by the caller as well as any |
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* {@link AutoDiscovery automatically discovered} guarding linkers and the standard fallback {@link BeansLinker} and a |
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* {@link DefaultPrelinkFilter}. See {@link DynamicLinker} documentation for tips on how to use this class. |
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* |
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* @author Attila Szegedi |
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*/ |
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public class DynamicLinkerFactory { |
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/** |
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* Default value for {@link #setUnstableRelinkThreshold(int) unstable relink threshold}. |
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*/ |
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public static final int DEFAULT_UNSTABLE_RELINK_THRESHOLD = 8; |
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private boolean classLoaderExplicitlySet = false; |
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private ClassLoader classLoader; |
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private List<? extends GuardingDynamicLinker> prioritizedLinkers; |
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private List<? extends GuardingDynamicLinker> fallbackLinkers; |
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private int runtimeContextArgCount = 0; |
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private boolean syncOnRelink = false; |
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private int unstableRelinkThreshold = DEFAULT_UNSTABLE_RELINK_THRESHOLD; |
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private MethodTypeConversionStrategy autoConversionStrategy; |
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private MethodHandleTransformer internalObjectsFilter; |
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|
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/** |
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* Sets the class loader for automatic discovery of available linkers. If not set explicitly, then the thread |
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* context class loader at the time of {@link #createLinker()} invocation will be used. |
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* |
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* @param classLoader the class loader used for the autodiscovery of available linkers. |
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*/ |
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public void setClassLoader(final ClassLoader classLoader) { |
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this.classLoader = classLoader; |
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classLoaderExplicitlySet = true; |
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} |
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|
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/** |
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* Sets the prioritized linkers. Language runtimes using this framework will usually precreate at least the linker |
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* for their own language. These linkers will be consulted first in the resulting dynamic linker, before any |
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* autodiscovered linkers. If the framework also autodiscovers a linker of the same class as one of the prioritized |
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* linkers, it will be ignored and the explicit prioritized instance will be used. |
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* |
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* @param prioritizedLinkers the list of prioritized linkers. Null can be passed to indicate no prioritized linkers |
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* (this is also the default value). |
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*/ |
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public void setPrioritizedLinkers(final List<? extends GuardingDynamicLinker> prioritizedLinkers) { |
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this.prioritizedLinkers = |
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prioritizedLinkers == null ? null : new ArrayList<>(prioritizedLinkers); |
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} |
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|
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/** |
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* Sets the prioritized linkers. Language runtimes using this framework will usually precreate at least the linker |
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* for their own language. These linkers will be consulted first in the resulting dynamic linker, before any |
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* autodiscovered linkers. If the framework also autodiscovers a linker of the same class as one of the prioritized |
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* linkers, it will be ignored and the explicit prioritized instance will be used. |
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* |
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* @param prioritizedLinkers a list of prioritized linkers. |
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*/ |
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public void setPrioritizedLinkers(final GuardingDynamicLinker... prioritizedLinkers) { |
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setPrioritizedLinkers(Arrays.asList(prioritizedLinkers)); |
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} |
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|
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/** |
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* Sets a single prioritized linker. Identical to calling {@link #setPrioritizedLinkers(List)} with a single-element |
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* list. |
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* |
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* @param prioritizedLinker the single prioritized linker. Must not be null. |
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* @throws IllegalArgumentException if null is passed. |
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*/ |
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public void setPrioritizedLinker(final GuardingDynamicLinker prioritizedLinker) { |
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if(prioritizedLinker == null) { |
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throw new IllegalArgumentException("prioritizedLinker == null"); |
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} |
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this.prioritizedLinkers = Collections.singletonList(prioritizedLinker); |
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} |
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|
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/** |
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* Sets the fallback linkers. These linkers will be consulted last in the resulting composite linker, after any |
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* autodiscovered linkers. If the framework also autodiscovers a linker of the same class as one of the fallback |
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* linkers, it will be ignored and the explicit fallback instance will be used. |
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* |
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* @param fallbackLinkers the list of fallback linkers. Can be empty to indicate the caller wishes to set no |
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* fallback linkers. |
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*/ |
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public void setFallbackLinkers(final List<? extends GuardingDynamicLinker> fallbackLinkers) { |
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this.fallbackLinkers = fallbackLinkers == null ? null : new ArrayList<>(fallbackLinkers); |
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} |
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|
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/** |
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* Sets the fallback linkers. These linkers will be consulted last in the resulting composite linker, after any |
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* autodiscovered linkers. If the framework also autodiscovers a linker of the same class as one of the fallback |
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* linkers, it will be ignored and the explicit fallback instance will be used. |
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* |
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* @param fallbackLinkers the list of fallback linkers. Can be empty to indicate the caller wishes to set no |
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* fallback linkers. If it is left as null, the standard fallback {@link BeansLinker} will be used. |
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*/ |
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public void setFallbackLinkers(final GuardingDynamicLinker... fallbackLinkers) { |
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setFallbackLinkers(Arrays.asList(fallbackLinkers)); |
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} |
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|
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/** |
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* Sets the number of arguments in the call sites that represent the stack context of the language runtime creating |
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* the linker. If the language runtime uses no context information passed on stack, then it should be zero |
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* (the default value). If it is set to nonzero value, then every dynamic call site emitted by this runtime must |
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* have the argument list of the form: {@code (this, contextArg1[, contextArg2[, ...]], normalArgs)}. It is |
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* advisable to only pass one context-specific argument, though, of an easily recognizable, runtime specific type |
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* encapsulating the runtime thread local state. |
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* |
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* @param runtimeContextArgCount the number of language runtime context arguments in call sites. |
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*/ |
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public void setRuntimeContextArgCount(final int runtimeContextArgCount) { |
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if(runtimeContextArgCount < 0) { |
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throw new IllegalArgumentException("runtimeContextArgCount < 0"); |
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} |
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this.runtimeContextArgCount = runtimeContextArgCount; |
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} |
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|
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/** |
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* Sets whether the linker created by this factory will invoke {@link MutableCallSite#syncAll(MutableCallSite[])} |
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* after a call site is relinked. Defaults to false. You probably want to set it to true if your runtime supports |
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* multithreaded execution of dynamically linked code. |
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* @param syncOnRelink true for invoking sync on relink, false otherwise. |
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*/ |
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public void setSyncOnRelink(final boolean syncOnRelink) { |
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this.syncOnRelink = syncOnRelink; |
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} |
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|
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/** |
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* Sets the unstable relink threshold; the number of times a call site is relinked after which it will be |
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* considered unstable, and subsequent link requests for it will indicate this. |
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* @param unstableRelinkThreshold the new threshold. Must not be less than zero. The value of zero means that |
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* call sites will never be considered unstable. |
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* @see LinkRequest#isCallSiteUnstable() |
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*/ |
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public void setUnstableRelinkThreshold(final int unstableRelinkThreshold) { |
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if(unstableRelinkThreshold < 0) { |
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throw new IllegalArgumentException("unstableRelinkThreshold < 0"); |
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} |
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this.unstableRelinkThreshold = unstableRelinkThreshold; |
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} |
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|
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/** |
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* Set the pre-link filter. This is a {@link GuardedInvocationFilter} that will get the final chance to modify the |
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* guarded invocation after it has been created by a component linker and before the dynamic linker links it into |
|
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* the call site. It is normally used to adapt the return value type of the invocation to the type of the call site. |
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* When not set explicitly, {@link DefaultPrelinkFilter} will be used. |
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* @param prelinkFilter the pre-link filter for the dynamic linker. |
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*/ |
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public void setPrelinkFilter(final GuardedInvocationFilter prelinkFilter) { |
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this.prelinkFilter = prelinkFilter; |
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} |
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||
266 |
/** |
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* Sets an object representing the conversion strategy for automatic type conversions. After |
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* {@link TypeConverterFactory#asType(java.lang.invoke.MethodHandle, java.lang.invoke.MethodType)} has |
|
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* applied all custom conversions to a method handle, it still needs to effect |
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* {@link TypeUtilities#isMethodInvocationConvertible(Class, Class) method invocation conversions} that |
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* can usually be automatically applied as per |
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* {@link java.lang.invoke.MethodHandle#asType(java.lang.invoke.MethodType)}. |
|
273 |
* However, sometimes language runtimes will want to customize even those conversions for their own call |
|
274 |
* sites. A typical example is allowing unboxing of null return values, which is by default prohibited by |
|
275 |
* ordinary {@code MethodHandles.asType}. In this case, a language runtime can install its own custom |
|
276 |
* automatic conversion strategy, that can deal with null values. Note that when the strategy's |
|
277 |
* {@link MethodTypeConversionStrategy#asType(java.lang.invoke.MethodHandle, java.lang.invoke.MethodType)} |
|
278 |
* is invoked, the custom language conversions will already have been applied to the method handle, so by |
|
279 |
* design the difference between the handle's current method type and the desired final type will always |
|
280 |
* only be ones that can be subjected to method invocation conversions. The strategy also doesn't need to |
|
281 |
* invoke a final {@code MethodHandle.asType()} as the converter factory will do that as the final step. |
|
282 |
* @param autoConversionStrategy the strategy for applying method invocation conversions for the linker |
|
283 |
* created by this factory. |
|
284 |
*/ |
|
285 |
public void setAutoConversionStrategy(final MethodTypeConversionStrategy autoConversionStrategy) { |
|
286 |
this.autoConversionStrategy = autoConversionStrategy; |
|
287 |
} |
|
288 |
||
289 |
/** |
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* Sets a method handle transformer that is supposed to act as the implementation of this linker factory's linkers' |
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* services {@link LinkerServices#filterInternalObjects(java.lang.invoke.MethodHandle)} method. |
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* @param internalObjectsFilter a method handle transformer filtering out internal objects, or null. |
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*/ |
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public void setInternalObjectsFilter(final MethodHandleTransformer internalObjectsFilter) { |
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this.internalObjectsFilter = internalObjectsFilter; |
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} |
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297 |
|
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/** |
24719 | 299 |
* Creates a new dynamic linker consisting of all the prioritized, autodiscovered, and fallback linkers as well as |
300 |
* the pre-link filter. |
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* |
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* @return the new dynamic Linker |
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*/ |
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public DynamicLinker createLinker() { |
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// Treat nulls appropriately |
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if(prioritizedLinkers == null) { |
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prioritizedLinkers = Collections.emptyList(); |
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} |
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if(fallbackLinkers == null) { |
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fallbackLinkers = Collections.singletonList(new BeansLinker()); |
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} |
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312 |
|
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// Gather classes of all precreated (prioritized and fallback) linkers. |
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// We'll filter out any discovered linkers of the same class. |
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final Set<Class<? extends GuardingDynamicLinker>> knownLinkerClasses = |
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new HashSet<>(); |
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addClasses(knownLinkerClasses, prioritizedLinkers); |
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318 |
addClasses(knownLinkerClasses, fallbackLinkers); |
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319 |
|
19455 | 320 |
final ClassLoader effectiveClassLoader = classLoaderExplicitlySet ? classLoader : getThreadContextClassLoader(); |
321 |
final List<GuardingDynamicLinker> discovered = AutoDiscovery.loadLinkers(effectiveClassLoader); |
|
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322 |
// Now, concatenate ... |
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323 |
final List<GuardingDynamicLinker> linkers = |
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324 |
new ArrayList<>(prioritizedLinkers.size() + discovered.size() |
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325 |
+ fallbackLinkers.size()); |
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|
326 |
// ... prioritized linkers, ... |
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|
327 |
linkers.addAll(prioritizedLinkers); |
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|
328 |
// ... filtered discovered linkers, ... |
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329 |
for(final GuardingDynamicLinker linker: discovered) { |
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|
330 |
if(!knownLinkerClasses.contains(linker.getClass())) { |
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|
331 |
linkers.add(linker); |
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|
332 |
} |
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|
333 |
} |
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|
334 |
// ... and finally fallback linkers. |
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|
335 |
linkers.addAll(fallbackLinkers); |
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|
336 |
final List<GuardingDynamicLinker> optimized = CompositeTypeBasedGuardingDynamicLinker.optimize(linkers); |
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|
337 |
final GuardingDynamicLinker composite; |
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|
338 |
switch(linkers.size()) { |
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|
339 |
case 0: { |
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|
340 |
composite = BottomGuardingDynamicLinker.INSTANCE; |
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|
341 |
break; |
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diff
changeset
|
342 |
} |
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|
343 |
case 1: { |
86cb162cec6c
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|
344 |
composite = optimized.get(0); |
86cb162cec6c
8008085: Integrate Dynalink source code into Nashorn codebase
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diff
changeset
|
345 |
break; |
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8008085: Integrate Dynalink source code into Nashorn codebase
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diff
changeset
|
346 |
} |
86cb162cec6c
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changeset
|
347 |
default: { |
86cb162cec6c
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|
348 |
composite = new CompositeGuardingDynamicLinker(optimized); |
86cb162cec6c
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diff
changeset
|
349 |
break; |
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diff
changeset
|
350 |
} |
86cb162cec6c
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diff
changeset
|
351 |
} |
86cb162cec6c
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diff
changeset
|
352 |
|
86cb162cec6c
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diff
changeset
|
353 |
final List<GuardingTypeConverterFactory> typeConverters = new LinkedList<>(); |
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|
354 |
for(final GuardingDynamicLinker linker: linkers) { |
16234
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changeset
|
355 |
if(linker instanceof GuardingTypeConverterFactory) { |
86cb162cec6c
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diff
changeset
|
356 |
typeConverters.add((GuardingTypeConverterFactory)linker); |
86cb162cec6c
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diff
changeset
|
357 |
} |
86cb162cec6c
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diff
changeset
|
358 |
} |
86cb162cec6c
8008085: Integrate Dynalink source code into Nashorn codebase
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diff
changeset
|
359 |
|
24719 | 360 |
if(prelinkFilter == null) { |
361 |
prelinkFilter = new DefaultPrelinkFilter(); |
|
362 |
} |
|
363 |
||
27360 | 364 |
return new DynamicLinker(new LinkerServicesImpl(new TypeConverterFactory(typeConverters, |
28881
0008daeef352
8072596: Arrays.asList results in ClassCastException with a JS array
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diff
changeset
|
365 |
autoConversionStrategy), composite, internalObjectsFilter), prelinkFilter, runtimeContextArgCount, |
0008daeef352
8072596: Arrays.asList results in ClassCastException with a JS array
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diff
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|
366 |
syncOnRelink, unstableRelinkThreshold); |
16234
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|
367 |
} |
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changeset
|
368 |
|
19455 | 369 |
private static ClassLoader getThreadContextClassLoader() { |
370 |
return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() { |
|
371 |
@Override |
|
372 |
public ClassLoader run() { |
|
373 |
return Thread.currentThread().getContextClassLoader(); |
|
374 |
} |
|
19461 | 375 |
}, ClassLoaderGetterContextProvider.GET_CLASS_LOADER_CONTEXT); |
19455 | 376 |
} |
377 |
||
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|
378 |
private static void addClasses(final Set<Class<? extends GuardingDynamicLinker>> knownLinkerClasses, |
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|
379 |
final List<? extends GuardingDynamicLinker> linkers) { |
2ff5d7041566
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changeset
|
380 |
for(final GuardingDynamicLinker linker: linkers) { |
16234
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|
381 |
knownLinkerClasses.add(linker.getClass()); |
86cb162cec6c
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diff
changeset
|
382 |
} |
86cb162cec6c
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diff
changeset
|
383 |
} |
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changeset
|
384 |
} |