--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/internal/dynalink/support/CallSiteDescriptorFactory.java Wed Jul 05 20:54:58 2017 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,274 +0,0 @@
-/*
- * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-/*
- * This file is available under and governed by the GNU General Public
- * License version 2 only, as published by the Free Software Foundation.
- * However, the following notice accompanied the original version of this
- * file, and Oracle licenses the original version of this file under the BSD
- * license:
- */
-/*
- Copyright 2009-2013 Attila Szegedi
-
- Licensed under both the Apache License, Version 2.0 (the "Apache License")
- and the BSD License (the "BSD License"), with licensee being free to
- choose either of the two at their discretion.
-
- You may not use this file except in compliance with either the Apache
- License or the BSD License.
-
- If you choose to use this file in compliance with the Apache License, the
- following notice applies to you:
-
- You may obtain a copy of the Apache License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
- implied. See the License for the specific language governing
- permissions and limitations under the License.
-
- If you choose to use this file in compliance with the BSD License, the
- following notice applies to you:
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
- * Neither the name of the copyright holder nor the names of
- contributors may be used to endorse or promote products derived from
- this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
- BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
- BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-package jdk.internal.dynalink.support;
-
-import java.lang.invoke.MethodHandles;
-import java.lang.invoke.MethodHandles.Lookup;
-import java.lang.invoke.MethodType;
-import java.lang.ref.Reference;
-import java.lang.ref.WeakReference;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.Objects;
-import java.util.StringTokenizer;
-import java.util.WeakHashMap;
-import jdk.internal.dynalink.CallSiteDescriptor;
-
-/**
- * Usable as a default factory for call site descriptor implementations. It is weakly canonicalizing, meaning
- * it will return the same immutable call site descriptor for identical inputs, i.e. repeated requests for a
- * descriptor signifying public lookup for {@code "dyn:getProp:color"} of type {@code Object(Object)} will
- * return the same object as long as a previously created, at least softly reachable one exists. It also uses
- * several different implementations of the {@link CallSiteDescriptor} internally, and chooses the most
- * space-efficient one based on the input.
- */
-public class CallSiteDescriptorFactory {
- private static final WeakHashMap<CallSiteDescriptor, Reference<CallSiteDescriptor>> publicDescs =
- new WeakHashMap<>();
-
-
- private CallSiteDescriptorFactory() {
- }
-
- /**
- * Creates a new call site descriptor instance. The actual underlying class of the instance is dependent on the
- * passed arguments to be space efficient; i.e. if you only use the public lookup, you'll get back an
- * implementation that doesn't waste space on storing the lookup object.
- * @param lookup the lookup that determines access rights at the call site. If your language runtime doesn't have
- * equivalents of Java access concepts, just use {@link MethodHandles#publicLookup()}. Must not be null.
- * @param name the name of the method at the call site. Must not be null.
- * @param methodType the type of the method at the call site. Must not be null.
- * @return a call site descriptor representing the input. Note that although the method name is "create", it will
- * in fact return a weakly-referenced canonical instance.
- */
- public static CallSiteDescriptor create(final Lookup lookup, final String name, final MethodType methodType) {
- Objects.requireNonNull(name);
- Objects.requireNonNull(methodType);
- Objects.requireNonNull(lookup);
- final String[] tokenizedName = tokenizeName(name);
- if(isPublicLookup(lookup)) {
- return getCanonicalPublicDescriptor(createPublicCallSiteDescriptor(tokenizedName, methodType));
- }
- return new LookupCallSiteDescriptor(tokenizedName, methodType, lookup);
- }
-
- static CallSiteDescriptor getCanonicalPublicDescriptor(final CallSiteDescriptor desc) {
- synchronized(publicDescs) {
- final Reference<CallSiteDescriptor> ref = publicDescs.get(desc);
- if(ref != null) {
- final CallSiteDescriptor canonical = ref.get();
- if(canonical != null) {
- return canonical;
- }
- }
- publicDescs.put(desc, createReference(desc));
- }
- return desc;
- }
-
- /**
- * Override this to use a different kind of references for the cache
- * @param desc desc
- * @return reference
- */
- protected static Reference<CallSiteDescriptor> createReference(final CallSiteDescriptor desc) {
- return new WeakReference<>(desc);
- }
-
- private static CallSiteDescriptor createPublicCallSiteDescriptor(final String[] tokenizedName, final MethodType methodType) {
- final int l = tokenizedName.length;
- if(l > 0 && tokenizedName[0] == "dyn") {
- if(l == 2) {
- return new UnnamedDynCallSiteDescriptor(tokenizedName[1], methodType);
- } if (l == 3) {
- return new NamedDynCallSiteDescriptor(tokenizedName[1], tokenizedName[2], methodType);
- }
- }
- return new DefaultCallSiteDescriptor(tokenizedName, methodType);
- }
-
- private static boolean isPublicLookup(final Lookup lookup) {
- return lookup == MethodHandles.publicLookup();
- }
-
- /**
- * Tokenizes the composite name along colons, as well as {@link NameCodec#decode(String) demangles} and interns
- * the tokens. The first two tokens are not demangled as they are supposed to be the naming scheme and the name of
- * the operation which can be expected to consist of just alphabetical characters.
- * @param name the composite name consisting of colon-separated, possibly mangled tokens.
- * @return an array of tokens
- */
- public static String[] tokenizeName(final String name) {
- final StringTokenizer tok = new StringTokenizer(name, CallSiteDescriptor.TOKEN_DELIMITER);
- final String[] tokens = new String[tok.countTokens()];
- for(int i = 0; i < tokens.length; ++i) {
- String token = tok.nextToken();
- if(i > 1) {
- token = NameCodec.decode(token);
- }
- tokens[i] = token.intern();
- }
- return tokens;
- }
-
- /**
- * Tokenizes a composite operation name along pipe characters. I.e. if you have a "dyn:getElem|getProp|getMethod"
- * operation, returns a list of ["getElem", "getProp", "getMethod"]. The tokens are not interned.
- * @param desc the call site descriptor with the operation
- * @return a list of tokens
- */
- public static List<String> tokenizeOperators(final CallSiteDescriptor desc) {
- final String ops = desc.getNameToken(CallSiteDescriptor.OPERATOR);
- final StringTokenizer tok = new StringTokenizer(ops, CallSiteDescriptor.OPERATOR_DELIMITER);
- final int count = tok.countTokens();
- if(count == 1) {
- return Collections.singletonList(ops);
- }
- final String[] tokens = new String[count];
- for(int i = 0; i < count; ++i) {
- tokens[i] = tok.nextToken();
- }
- return Arrays.asList(tokens);
- }
-
- /**
- * Returns a new call site descriptor that is identical to the passed one, except that it has some parameter types
- * removed from its method type.
- * @param desc the original call site descriptor
- * @param start index of the first parameter to remove
- * @param end index of the first parameter to not remove
- * @return a new call site descriptor with modified method type
- */
- public static CallSiteDescriptor dropParameterTypes(final CallSiteDescriptor desc, final int start, final int end) {
- return desc.changeMethodType(desc.getMethodType().dropParameterTypes(start, end));
- }
-
- /**
- * Returns a new call site descriptor that is identical to the passed one, except that it has a single parameter
- * type changed in its method type.
- * @param desc the original call site descriptor
- * @param num index of the parameter to change
- * @param nptype the new parameter type
- * @return a new call site descriptor with modified method type
- */
- public static CallSiteDescriptor changeParameterType(final CallSiteDescriptor desc, final int num, final Class<?> nptype) {
- return desc.changeMethodType(desc.getMethodType().changeParameterType(num, nptype));
- }
-
- /**
- * Returns a new call site descriptor that is identical to the passed one, except that it has the return type
- * changed in its method type.
- * @param desc the original call site descriptor
- * @param nrtype the new return type
- * @return a new call site descriptor with modified method type
- */
- public static CallSiteDescriptor changeReturnType(final CallSiteDescriptor desc, final Class<?> nrtype) {
- return desc.changeMethodType(desc.getMethodType().changeReturnType(nrtype));
- }
-
- /**
- * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
- * types inserted into its method type.
- * @param desc the original call site descriptor
- * @param num index at which the new parameters are inserted
- * @param ptypesToInsert the new types to insert
- * @return a new call site descriptor with modified method type
- */
- public static CallSiteDescriptor insertParameterTypes(final CallSiteDescriptor desc, final int num, final Class<?>... ptypesToInsert) {
- return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
- }
-
- /**
- * Returns a new call site descriptor that is identical to the passed one, except that it has additional parameter
- * types inserted into its method type.
- * @param desc the original call site descriptor
- * @param num index at which the new parameters are inserted
- * @param ptypesToInsert the new types to insert
- * @return a new call site descriptor with modified method type
- */
- public static CallSiteDescriptor insertParameterTypes(final CallSiteDescriptor desc, final int num, final List<Class<?>> ptypesToInsert) {
- return desc.changeMethodType(desc.getMethodType().insertParameterTypes(num, ptypesToInsert));
- }
-}