author | lagergren |
Tue, 01 Apr 2014 16:12:38 +0200 | |
changeset 24735 | 9833d3ceed5b |
parent 16245 | 6a1c6c8bc113 |
child 24778 | 2ff5d7041566 |
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.MethodHandles; |
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import java.lang.invoke.MethodHandles.Lookup; |
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import java.lang.invoke.MethodType; |
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import java.lang.ref.Reference; |
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import java.lang.ref.WeakReference; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.StringTokenizer; |
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import java.util.WeakHashMap; |
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import jdk.internal.dynalink.CallSiteDescriptor; |
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/** |
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* Usable as a default factory for call site descriptor implementations. It is weakly canonicalizing, meaning it will |
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* return the same immutable call site descriptor for identical inputs, i.e. repeated requests for a descriptor |
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* signifying public lookup for "dyn:getProp:color" of type "Object(Object)" will return the same object as long as |
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* a previously created, at least softly reachable one exists. It also uses several different implementations of the |
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* {@link CallSiteDescriptor} internally, and chooses the most space-efficient one based on the input. |
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* @author Attila Szegedi |
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*/ |
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public class CallSiteDescriptorFactory { |
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private static final WeakHashMap<CallSiteDescriptor, Reference<CallSiteDescriptor>> publicDescs = |
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new WeakHashMap<>(); |
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private CallSiteDescriptorFactory() { |
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} |
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/** |
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* Creates a new call site descriptor instance. The actual underlying class of the instance is dependent on the |
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* passed arguments to be space efficient; i.e. if you only use the public lookup, you'll get back an |
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* implementation that doesn't waste space on storing the lookup object. |
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* @param lookup the lookup that determines access rights at the call site. If your language runtime doesn't have |
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* equivalents of Java access concepts, just use {@link MethodHandles#publicLookup()}. Must not be null. |
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* @param name the name of the method at the call site. Must not be null. |
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* @param methodType the type of the method at the call site. Must not be null. |
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* @return a call site descriptor representing the input. Note that although the method name is "create", it will |
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* in fact return a weakly-referenced canonical instance. |
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*/ |
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public static CallSiteDescriptor create(Lookup lookup, String name, MethodType methodType) { |
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name.getClass(); // NPE check |
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methodType.getClass(); // NPE check |
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lookup.getClass(); // NPE check |
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final String[] tokenizedName = tokenizeName(name); |
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if(isPublicLookup(lookup)) { |
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return getCanonicalPublicDescriptor(createPublicCallSiteDescriptor(tokenizedName, methodType)); |
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} |
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return new LookupCallSiteDescriptor(tokenizedName, methodType, lookup); |
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} |
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|
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static CallSiteDescriptor getCanonicalPublicDescriptor(final CallSiteDescriptor desc) { |
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synchronized(publicDescs) { |
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final Reference<CallSiteDescriptor> ref = publicDescs.get(desc); |
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if(ref != null) { |
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final CallSiteDescriptor canonical = ref.get(); |
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if(canonical != null) { |
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return canonical; |
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} |
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} |
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publicDescs.put(desc, createReference(desc)); |
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} |
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return desc; |
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} |
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|
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/** |
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* Override this to use a different kind of references for the cache |
|
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* @param desc desc |
|
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* @return reference |
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*/ |
|
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protected static Reference<CallSiteDescriptor> createReference(final CallSiteDescriptor desc) { |
|
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return new WeakReference<>(desc); |
|
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} |
|
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||
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private static CallSiteDescriptor createPublicCallSiteDescriptor(String[] tokenizedName, MethodType methodType) { |
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final int l = tokenizedName.length; |
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if(l > 0 && tokenizedName[0] == "dyn") { |
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if(l == 2) { |
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return new UnnamedDynCallSiteDescriptor(tokenizedName[1], methodType); |
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} if (l == 3) { |
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return new NamedDynCallSiteDescriptor(tokenizedName[1], tokenizedName[2], methodType); |
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} |
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} |
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return new DefaultCallSiteDescriptor(tokenizedName, methodType); |
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} |
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|
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private static boolean isPublicLookup(Lookup lookup) { |
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return lookup == MethodHandles.publicLookup(); |
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} |
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|
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/** |
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* Tokenizes the composite name along colons, as well as {@link NameCodec#decode(String) demangles} and interns |
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* the tokens. The first two tokens are not demangled as they are supposed to be the naming scheme and the name of |
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* the operation which can be expected to consist of just alphabetical characters. |
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* @param name the composite name consisting of colon-separated, possibly mangled tokens. |
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* @return an array of tokens |
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*/ |
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public static String[] tokenizeName(String name) { |
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final StringTokenizer tok = new StringTokenizer(name, CallSiteDescriptor.TOKEN_DELIMITER); |
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final String[] tokens = new String[tok.countTokens()]; |
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for(int i = 0; i < tokens.length; ++i) { |
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String token = tok.nextToken(); |
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if(i > 1) { |
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token = NameCodec.decode(token); |
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} |
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tokens[i] = token.intern(); |
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} |
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return tokens; |
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} |
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|
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/** |
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* Tokenizes a composite operation name along pipe characters. I.e. if you have a "dyn:getElem|getProp|getMethod" |
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* operation, returns a list of ["getElem", "getProp", "getMethod"]. The tokens are not interned. |
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* @param desc the call site descriptor with the operation |
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* @return a list of tokens |
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*/ |
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public static List<String> tokenizeOperators(CallSiteDescriptor desc) { |
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final String ops = desc.getNameToken(CallSiteDescriptor.OPERATOR); |
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final StringTokenizer tok = new StringTokenizer(ops, CallSiteDescriptor.OPERATOR_DELIMITER); |
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final int count = tok.countTokens(); |
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if(count == 1) { |
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return Collections.singletonList(ops); |
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} |
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final String[] tokens = new String[count]; |
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for(int i = 0; i < count; ++i) { |
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tokens[i] = tok.nextToken(); |
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} |
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return Arrays.asList(tokens); |
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} |
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|
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/** |
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* Returns a new call site descriptor that is identical to the passed one, except that it has some parameter types |
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* removed from its method type. |
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* @param desc the original call site descriptor |
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* @param start index of the first parameter to remove |
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* @param end index of the first parameter to not remove |
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* @return a new call site descriptor with modified method type |
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*/ |
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public static CallSiteDescriptor dropParameterTypes(CallSiteDescriptor desc, int start, int end) { |
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return desc.changeMethodType(desc.getMethodType().dropParameterTypes(start, end)); |
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} |
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|
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/** |
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* Returns a new call site descriptor that is identical to the passed one, except that it has a single parameter |
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* type changed in its method type. |
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* @param desc the original call site descriptor |
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* @param num index of the parameter to change |
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* @param nptype the new parameter type |
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* @return a new call site descriptor with modified method type |
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234 |
*/ |
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public static CallSiteDescriptor changeParameterType(CallSiteDescriptor desc, int num, Class<?> nptype) { |
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return desc.changeMethodType(desc.getMethodType().changeParameterType(num, nptype)); |
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} |
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|
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/** |
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* Returns a new call site descriptor that is identical to the passed one, except that it has the return type |
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* changed in its method type. |
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* @param desc the original call site descriptor |
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* @param nrtype the new return type |
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* @return a new call site descriptor with modified method type |
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*/ |
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public static CallSiteDescriptor changeReturnType(CallSiteDescriptor desc, Class<?> nrtype) { |
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return desc.changeMethodType(desc.getMethodType().changeReturnType(nrtype)); |
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} |
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|
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250 |
/** |
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* Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter |
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* types inserted into its method type. |
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* @param desc the original call site descriptor |
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* @param num index at which the new parameters are inserted |
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* @param ptypesToInsert the new types to insert |
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* @return a new call site descriptor with modified method type |
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*/ |
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public static CallSiteDescriptor insertParameterTypes(CallSiteDescriptor desc, int num, Class<?>... ptypesToInsert) { |
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return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert)); |
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} |
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|
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/** |
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* Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter |
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* types inserted into its method type. |
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* @param desc the original call site descriptor |
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* @param num index at which the new parameters are inserted |
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* @param ptypesToInsert the new types to insert |
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* @return a new call site descriptor with modified method type |
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*/ |
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public static CallSiteDescriptor insertParameterTypes(CallSiteDescriptor desc, int num, List<Class<?>> ptypesToInsert) { |
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return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert)); |
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} |
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} |