--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk/internal/dynalink/beans/OverloadedMethod.java Thu Feb 14 13:22:26 2013 +0100
@@ -0,0 +1,266 @@
+/*
+ * 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.beans;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import jdk.internal.dynalink.linker.LinkerServices;
+import jdk.internal.dynalink.support.Lookup;
+
+
+/**
+ * Represents a subset of overloaded methods for a certain method name on a certain class. It can be either a fixarg or
+ * a vararg subset depending on the subclass. The method is for a fixed number of arguments though (as it is generated
+ * for a concrete call site). As such, all methods in the subset can be invoked with the specified number of arguments
+ * (exactly matching for fixargs, or having less than or equal fixed arguments, for varargs).
+ *
+ * @author Attila Szegedi
+ */
+class OverloadedMethod {
+ private final Map<ClassString, MethodHandle> argTypesToMethods = new ConcurrentHashMap<>();
+ private final OverloadedDynamicMethod parent;
+ private final MethodType callSiteType;
+ private final MethodHandle invoker;
+ private final LinkerServices linkerServices;
+ private final ArrayList<MethodHandle> fixArgMethods;
+ private final ArrayList<MethodHandle> varArgMethods;
+
+ OverloadedMethod(List<MethodHandle> methodHandles, OverloadedDynamicMethod parent, MethodType callSiteType,
+ LinkerServices linkerServices) {
+ this.parent = parent;
+ this.callSiteType = callSiteType;
+ this.linkerServices = linkerServices;
+
+ fixArgMethods = new ArrayList<>(methodHandles.size());
+ varArgMethods = new ArrayList<>(methodHandles.size());
+ final int argNum = callSiteType.parameterCount();
+ for(MethodHandle mh: methodHandles) {
+ if(mh.isVarargsCollector()) {
+ final MethodHandle asFixed = mh.asFixedArity();
+ if(argNum == asFixed.type().parameterCount()) {
+ fixArgMethods.add(asFixed);
+ }
+ varArgMethods.add(mh);
+ } else {
+ fixArgMethods.add(mh);
+ }
+ }
+ fixArgMethods.trimToSize();
+ varArgMethods.trimToSize();
+
+ final MethodHandle bound = SELECT_METHOD.bindTo(this);
+ final MethodHandle collecting = SimpleDynamicMethod.collectArguments(bound, argNum).asType(
+ callSiteType.changeReturnType(MethodHandle.class));
+ invoker = MethodHandles.foldArguments(MethodHandles.exactInvoker(callSiteType), collecting);
+ }
+
+ MethodHandle getInvoker() {
+ return invoker;
+ }
+
+ private static final MethodHandle SELECT_METHOD = Lookup.findOwnSpecial(MethodHandles.lookup(), "selectMethod",
+ MethodHandle.class, Object[].class);
+
+ @SuppressWarnings("unused")
+ private MethodHandle selectMethod(Object[] args) throws NoSuchMethodException {
+ final Class<?>[] argTypes = new Class[args.length];
+ for(int i = 0; i < argTypes.length; ++i) {
+ final Object arg = args[i];
+ argTypes[i] = arg == null ? callSiteType.parameterType(i) : arg.getClass();
+ }
+ final ClassString classString = new ClassString(argTypes);
+ MethodHandle method = argTypesToMethods.get(classString);
+ if(method == null) {
+ List<MethodHandle> methods = classString.getMaximallySpecifics(fixArgMethods, linkerServices, false);
+ if(methods.isEmpty()) {
+ methods = classString.getMaximallySpecifics(varArgMethods, linkerServices, true);
+ }
+ switch(methods.size()) {
+ case 0: {
+ method = getNoSuchMethodThrower(argTypes);
+ break;
+ }
+ case 1: {
+ method = new SimpleDynamicMethod(methods.get(0)).getInvocation(callSiteType, linkerServices);
+ break;
+ }
+ default: {
+ // This is unfortunate - invocation time ambiguity. We can still save the day if
+ method = getAmbiguousMethodThrower(argTypes, methods);
+ break;
+ }
+ }
+ // Avoid keeping references to unrelated classes; this ruins the performance a bit, but avoids class loader
+ // memory leaks.
+ if(classString.isVisibleFrom(parent.getClassLoader())) {
+ argTypesToMethods.put(classString, method);
+ }
+ }
+ return method;
+ }
+
+ private MethodHandle getNoSuchMethodThrower(Class<?>[] argTypes) {
+ return adaptThrower(MethodHandles.insertArguments(THROW_NO_SUCH_METHOD, 0, this, argTypes));
+ }
+
+ private static final MethodHandle THROW_NO_SUCH_METHOD = Lookup.findOwnSpecial(MethodHandles.lookup(),
+ "throwNoSuchMethod", void.class, Class[].class);
+
+ @SuppressWarnings("unused")
+ private void throwNoSuchMethod(Class<?>[] argTypes) throws NoSuchMethodException {
+ if(varArgMethods.isEmpty()) {
+ throw new NoSuchMethodException("None of the fixed arity signatures " + getSignatureList(fixArgMethods) +
+ " of method " + parent.getName() + " match the argument types " + argTypesString(argTypes));
+ }
+ throw new NoSuchMethodException("None of the fixed arity signatures " + getSignatureList(fixArgMethods) +
+ " or the variable arity signatures " + getSignatureList(varArgMethods) + " of the method " +
+ parent.getName() + " match the argument types " + argTypesString(argTypes));
+ }
+
+ private MethodHandle getAmbiguousMethodThrower(Class<?>[] argTypes, List<MethodHandle> methods) {
+ return adaptThrower(MethodHandles.insertArguments(THROW_AMBIGUOUS_METHOD, 0, this, argTypes, methods));
+ }
+
+ private MethodHandle adaptThrower(MethodHandle rawThrower) {
+ return MethodHandles.dropArguments(rawThrower, 0, callSiteType.parameterList()).asType(callSiteType);
+ }
+
+ private static final MethodHandle THROW_AMBIGUOUS_METHOD = Lookup.findOwnSpecial(MethodHandles.lookup(),
+ "throwAmbiguousMethod", void.class, Class[].class, List.class);
+
+ @SuppressWarnings("unused")
+ private void throwAmbiguousMethod(Class<?>[] argTypes, List<MethodHandle> methods) throws NoSuchMethodException {
+ final String arity = methods.get(0).isVarargsCollector() ? "variable" : "fixed";
+ throw new NoSuchMethodException("Can't unambiguously select between " + arity + " arity signatures " +
+ getSignatureList(methods) + " of the method " + parent.getName() + " for argument types " +
+ argTypesString(argTypes));
+ }
+
+ private static String argTypesString(Class<?>[] classes) {
+ final StringBuilder b = new StringBuilder().append('[');
+ appendTypes(b, classes, false);
+ return b.append(']').toString();
+ }
+
+ private static String getSignatureList(List<MethodHandle> methods) {
+ final StringBuilder b = new StringBuilder().append('[');
+ final Iterator<MethodHandle> it = methods.iterator();
+ if(it.hasNext()) {
+ appendSig(b, it.next());
+ while(it.hasNext()) {
+ appendSig(b.append(", "), it.next());
+ }
+ }
+ return b.append(']').toString();
+ }
+
+ private static void appendSig(StringBuilder b, MethodHandle m) {
+ b.append('(');
+ appendTypes(b, m.type().parameterArray(), m.isVarargsCollector());
+ b.append(')');
+ }
+
+ private static void appendTypes(StringBuilder b, Class<?>[] classes, boolean varArg) {
+ final int l = classes.length;
+ if(!varArg) {
+ if(l > 1) {
+ b.append(classes[1].getCanonicalName());
+ for(int i = 2; i < l; ++i) {
+ b.append(", ").append(classes[i].getCanonicalName());
+ }
+ }
+ } else {
+ for(int i = 1; i < l - 1; ++i) {
+ b.append(classes[i].getCanonicalName()).append(", ");
+ }
+ b.append(classes[l - 1].getComponentType().getCanonicalName()).append("...");
+ }
+ }
+}
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