author | attila |
Mon, 18 Feb 2013 16:00:15 +0100 | |
changeset 16245 | 6a1c6c8bc113 |
parent 16234 | 86cb162cec6c |
child 19455 | b972b61a6921 |
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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/* |
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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.support; |
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import java.lang.invoke.MethodHandle; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.MethodType; |
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import java.util.logging.Level; |
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import java.util.logging.Logger; |
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import jdk.internal.dynalink.linker.LinkerServices; |
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/** |
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* Utility methods for creating typical guards. TODO: introduce reasonable caching of created guards. |
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* |
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* @author Attila Szegedi |
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*/ |
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public class Guards { |
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private static final Logger LOG = Logger |
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.getLogger(Guards.class.getName(), "jdk.internal.dynalink.support.messages"); |
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private Guards() { |
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} |
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/** |
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* Creates a guard method handle with arguments of a specified type, but with boolean return value. When invoked, it |
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* returns true if the first argument is of the specified class (exactly of it, not a subclass). The rest of the |
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* arguments will be ignored. |
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* |
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* @param clazz the class of the first argument to test for |
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* @param type the method type |
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* @return a method handle testing whether its first argument is of the specified class. |
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*/ |
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@SuppressWarnings("boxing") |
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public static MethodHandle isOfClass(Class<?> clazz, MethodType type) { |
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final Class<?> declaredType = type.parameterType(0); |
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if(clazz == declaredType) { |
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LOG.log(Level.WARNING, "isOfClassGuardAlwaysTrue", new Object[] { clazz.getName(), 0, type }); |
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return constantTrue(type); |
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} |
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if(!declaredType.isAssignableFrom(clazz)) { |
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LOG.log(Level.WARNING, "isOfClassGuardAlwaysFalse", new Object[] { clazz.getName(), 0, type }); |
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return constantFalse(type); |
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} |
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return getClassBoundArgumentTest(IS_OF_CLASS, clazz, 0, type); |
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} |
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|
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/** |
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* Creates a method handle with arguments of a specified type, but with boolean return value. When invoked, it |
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* returns true if the first argument is instance of the specified class or its subclass). The rest of the arguments |
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* will be ignored. |
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* |
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* @param clazz the class of the first argument to test for |
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* @param type the method type |
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* @return a method handle testing whether its first argument is of the specified class or subclass. |
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*/ |
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public static MethodHandle isInstance(Class<?> clazz, MethodType type) { |
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return isInstance(clazz, 0, type); |
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} |
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|
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/** |
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* Creates a method handle with arguments of a specified type, but with boolean return value. When invoked, it |
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* returns true if the n'th argument is instance of the specified class or its subclass). The rest of the arguments |
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* will be ignored. |
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* |
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* @param clazz the class of the first argument to test for |
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* @param pos the position on the argument list to test |
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* @param type the method type |
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* @return a method handle testing whether its first argument is of the specified class or subclass. |
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*/ |
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151 |
@SuppressWarnings("boxing") |
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public static MethodHandle isInstance(Class<?> clazz, int pos, MethodType type) { |
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final Class<?> declaredType = type.parameterType(pos); |
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if(clazz.isAssignableFrom(declaredType)) { |
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LOG.log(Level.WARNING, "isInstanceGuardAlwaysTrue", new Object[] { clazz.getName(), pos, type }); |
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return constantTrue(type); |
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157 |
} |
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if(!declaredType.isAssignableFrom(clazz)) { |
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LOG.log(Level.WARNING, "isInstanceGuardAlwaysFalse", new Object[] { clazz.getName(), pos, type }); |
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return constantFalse(type); |
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161 |
} |
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return getClassBoundArgumentTest(IS_INSTANCE, clazz, pos, type); |
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} |
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|
164 |
|
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165 |
/** |
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166 |
* Creates a method handle that returns true if the argument in the specified position is a Java array. |
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167 |
* |
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168 |
* @param pos the position in the argument lit |
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169 |
* @param type the method type of the handle |
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* @return a method handle that returns true if the argument in the specified position is a Java array; the rest of |
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* the arguments are ignored. |
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|
172 |
*/ |
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|
173 |
@SuppressWarnings("boxing") |
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174 |
public static MethodHandle isArray(int pos, MethodType type) { |
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final Class<?> declaredType = type.parameterType(pos); |
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176 |
if(declaredType.isArray()) { |
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|
177 |
LOG.log(Level.WARNING, "isArrayGuardAlwaysTrue", new Object[] { pos, type }); |
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return constantTrue(type); |
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|
179 |
} |
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|
180 |
if(!declaredType.isAssignableFrom(Object[].class)) { |
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LOG.log(Level.WARNING, "isArrayGuardAlwaysFalse", new Object[] { pos, type }); |
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182 |
return constantFalse(type); |
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|
183 |
} |
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184 |
return asType(IS_ARRAY, pos, type); |
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185 |
} |
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|
186 |
|
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187 |
/** |
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188 |
* Return true if it is safe to strongly reference a class from the referred class loader from a class associated |
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* with the referring class loader without risking a class loader memory leak. |
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190 |
* |
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191 |
* @param referrerLoader the referrer class loader |
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192 |
* @param referredLoader the referred class loader |
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193 |
* @return true if it is safe to strongly reference the class |
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|
194 |
*/ |
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195 |
public static boolean canReferenceDirectly(ClassLoader referrerLoader, final ClassLoader referredLoader) { |
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|
196 |
if(referredLoader == null) { |
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|
197 |
// Can always refer directly to a system class |
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|
198 |
return true; |
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|
199 |
} |
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|
200 |
if(referrerLoader == null) { |
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|
201 |
// System classes can't refer directly to any non-system class |
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|
202 |
return false; |
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|
203 |
} |
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|
204 |
// Otherwise, can only refer directly to classes residing in same or |
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205 |
// parent class loader. |
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|
206 |
|
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|
207 |
ClassLoader referrer = referrerLoader; |
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|
208 |
do { |
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|
209 |
if(referrer == referredLoader) { |
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|
210 |
return true; |
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|
211 |
} |
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|
212 |
referrer = referrer.getParent(); |
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|
213 |
} while(referrer != null); |
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|
214 |
return false; |
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|
215 |
} |
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|
216 |
|
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|
217 |
private static MethodHandle getClassBoundArgumentTest(MethodHandle test, Class<?> clazz, int pos, MethodType type) { |
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|
218 |
// Bind the class to the first argument of the test |
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|
219 |
return asType(test.bindTo(clazz), pos, type); |
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|
220 |
} |
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|
221 |
|
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|
222 |
/** |
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|
223 |
* Takes a guard-test method handle, and adapts it to the requested type, returning a boolean. Only applies |
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|
224 |
* conversions as per {@link MethodHandle#asType(MethodType)}. |
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|
225 |
* @param test the test method handle |
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|
226 |
* @param type the type to adapt the method handle to |
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|
227 |
* @return the adapted method handle |
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|
228 |
*/ |
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|
229 |
public static MethodHandle asType(MethodHandle test, MethodType type) { |
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|
230 |
return test.asType(getTestType(test, type)); |
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|
231 |
} |
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|
232 |
|
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|
233 |
/** |
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|
234 |
* Takes a guard-test method handle, and adapts it to the requested type, returning a boolean. Applies the passed |
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|
235 |
* {@link LinkerServices} object's {@link LinkerServices#asType(MethodHandle, MethodType)}. |
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|
236 |
* @param linkerServices the linker services to use for type conversions |
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|
237 |
* @param test the test method handle |
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|
238 |
* @param type the type to adapt the method handle to |
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|
239 |
* @return the adapted method handle |
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|
240 |
*/ |
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|
241 |
public static MethodHandle asType(LinkerServices linkerServices, MethodHandle test, MethodType type) { |
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|
242 |
return linkerServices.asType(test, getTestType(test, type)); |
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|
243 |
} |
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|
244 |
|
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245 |
private static MethodType getTestType(MethodHandle test, MethodType type) { |
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|
246 |
return type.dropParameterTypes(test.type().parameterCount(), |
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|
247 |
type.parameterCount()).changeReturnType(boolean.class); |
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|
248 |
} |
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|
249 |
|
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250 |
private static MethodHandle asType(MethodHandle test, int pos, MethodType type) { |
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|
251 |
assert test != null; |
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|
252 |
assert type != null; |
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|
253 |
assert type.parameterCount() > 0; |
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|
254 |
assert pos >= 0 && pos < type.parameterCount(); |
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|
255 |
assert test.type().parameterCount() == 1; |
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256 |
assert test.type().returnType() == Boolean.TYPE; |
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257 |
return MethodHandles.permuteArguments(test.asType(test.type().changeParameterType(0, type.parameterType(pos))), |
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258 |
type.changeReturnType(Boolean.TYPE), new int[] { pos }); |
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|
259 |
} |
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260 |
|
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private static final MethodHandle IS_OF_CLASS = new Lookup(MethodHandles.lookup()).findStatic(Guards.class, |
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"isOfClass", MethodType.methodType(Boolean.TYPE, Class.class, Object.class)); |
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|
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private static final MethodHandle IS_INSTANCE = Lookup.PUBLIC.findVirtual(Class.class, "isInstance", |
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MethodType.methodType(Boolean.TYPE, Object.class)); |
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|
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private static final MethodHandle IS_ARRAY = new Lookup(MethodHandles.lookup()).findStatic(Guards.class, "isArray", |
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MethodType.methodType(Boolean.TYPE, Object.class)); |
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|
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private static final MethodHandle IS_IDENTICAL = new Lookup(MethodHandles.lookup()).findStatic(Guards.class, |
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"isIdentical", MethodType.methodType(Boolean.TYPE, Object.class, Object.class)); |
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|
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private static final MethodHandle IS_NULL = new Lookup(MethodHandles.lookup()).findStatic(Guards.class, |
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"isNull", MethodType.methodType(Boolean.TYPE, Object.class)); |
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|
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private static final MethodHandle IS_NOT_NULL = new Lookup(MethodHandles.lookup()).findStatic(Guards.class, |
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"isNotNull", MethodType.methodType(Boolean.TYPE, Object.class)); |
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|
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/** |
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* Creates a guard method that tests its only argument for being of an exact particular class. |
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* @param clazz the class to test for. |
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* @return the desired guard method. |
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*/ |
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public static MethodHandle getClassGuard(Class<?> clazz) { |
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return IS_OF_CLASS.bindTo(clazz); |
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} |
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|
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/** |
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* Creates a guard method that tests its only argument for being an instance of a particular class. |
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* @param clazz the class to test for. |
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* @return the desired guard method. |
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*/ |
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public static MethodHandle getInstanceOfGuard(Class<?> clazz) { |
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return IS_INSTANCE.bindTo(clazz); |
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} |
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|
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/** |
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* Creates a guard method that tests its only argument for being referentially identical to another object |
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* @param obj the object used as referential identity test |
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* @return the desired guard method. |
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*/ |
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public static MethodHandle getIdentityGuard(Object obj) { |
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return IS_IDENTICAL.bindTo(obj); |
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} |
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|
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/** |
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* Returns a guard that tests whether the first argument is null. |
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* @return a guard that tests whether the first argument is null. |
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*/ |
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public static MethodHandle isNull() { |
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return IS_NULL; |
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} |
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|
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/** |
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* Returns a guard that tests whether the first argument is not null. |
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* @return a guard that tests whether the first argument is not null. |
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*/ |
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public static MethodHandle isNotNull() { |
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return IS_NOT_NULL; |
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} |
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|
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@SuppressWarnings("unused") |
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private static boolean isNull(Object obj) { |
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return obj == null; |
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} |
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|
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@SuppressWarnings("unused") |
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private static boolean isNotNull(Object obj) { |
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return obj != null; |
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} |
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|
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@SuppressWarnings("unused") |
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private static boolean isArray(Object o) { |
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return o != null && o.getClass().isArray(); |
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} |
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|
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@SuppressWarnings("unused") |
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private static boolean isOfClass(Class<?> c, Object o) { |
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return o != null && o.getClass() == c; |
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} |
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|
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@SuppressWarnings("unused") |
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private static boolean isIdentical(Object o1, Object o2) { |
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return o1 == o2; |
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} |
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|
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private static MethodHandle constantTrue(MethodType type) { |
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return constantBoolean(Boolean.TRUE, type); |
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} |
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|
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private static MethodHandle constantFalse(MethodType type) { |
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return constantBoolean(Boolean.FALSE, type); |
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} |
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|
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private static MethodHandle constantBoolean(Boolean value, MethodType type) { |
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return MethodHandles.permuteArguments(MethodHandles.constant(Boolean.TYPE, value), |
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type.changeReturnType(Boolean.TYPE)); |
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} |
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} |