--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/internal/dynalink/beans/OverloadedMethod.java Wed Jul 05 21:04:26 2017 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,280 +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.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.internal.InternalTypeUtilities;
-import jdk.internal.dynalink.linker.LinkerServices;
-import jdk.internal.dynalink.linker.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).
- */
-class OverloadedMethod {
- private final Map<ClassString, MethodHandle> argTypesToMethods = new ConcurrentHashMap<>();
- private final OverloadedDynamicMethod parent;
- private final ClassLoader callSiteClassLoader;
- private final MethodType callSiteType;
- private final MethodHandle invoker;
- private final LinkerServices linkerServices;
- private final ArrayList<MethodHandle> fixArgMethods;
- private final ArrayList<MethodHandle> varArgMethods;
-
- OverloadedMethod(final List<MethodHandle> methodHandles,
- final OverloadedDynamicMethod parent,
- final ClassLoader callSiteClassLoader,
- final MethodType callSiteType,
- final LinkerServices linkerServices) {
- this.parent = parent;
- this.callSiteClassLoader = callSiteClassLoader;
- final Class<?> commonRetType = getCommonReturnType(methodHandles);
- this.callSiteType = callSiteType.changeReturnType(commonRetType);
- this.linkerServices = linkerServices;
-
- fixArgMethods = new ArrayList<>(methodHandles.size());
- varArgMethods = new ArrayList<>(methodHandles.size());
- final int argNum = callSiteType.parameterCount();
- for(final 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 = SingleDynamicMethod.collectArguments(bound, argNum).asType(
- callSiteType.changeReturnType(MethodHandle.class));
- invoker = linkerServices.asTypeLosslessReturn(MethodHandles.foldArguments(
- MethodHandles.exactInvoker(this.callSiteType), collecting), callSiteType);
- }
-
- MethodHandle getInvoker() {
- return invoker;
- }
-
- private static final MethodHandle SELECT_METHOD = Lookup.findOwnSpecial(MethodHandles.lookup(), "selectMethod",
- MethodHandle.class, Object[].class);
-
- @SuppressWarnings("unused")
- private MethodHandle selectMethod(final 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 ? ClassString.NULL_CLASS : 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 = SingleDynamicMethod.getInvocation(methods.get(0), 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(callSiteClassLoader)) {
- argTypesToMethods.put(classString, method);
- }
- }
- return method;
- }
-
- private MethodHandle getNoSuchMethodThrower(final 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(final 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(final Class<?>[] argTypes, final List<MethodHandle> methods) {
- return adaptThrower(MethodHandles.insertArguments(THROW_AMBIGUOUS_METHOD, 0, this, argTypes, methods));
- }
-
- private MethodHandle adaptThrower(final 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(final Class<?>[] argTypes, final 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(final Class<?>[] classes) {
- final StringBuilder b = new StringBuilder().append('[');
- appendTypes(b, classes, false);
- return b.append(']').toString();
- }
-
- private static String getSignatureList(final 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(final StringBuilder b, final MethodHandle m) {
- b.append('(');
- appendTypes(b, m.type().parameterArray(), m.isVarargsCollector());
- b.append(')');
- }
-
- private static void appendTypes(final StringBuilder b, final Class<?>[] classes, final 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("...");
- }
- }
-
- private static Class<?> getCommonReturnType(final List<MethodHandle> methodHandles) {
- final Iterator<MethodHandle> it = methodHandles.iterator();
- Class<?> retType = it.next().type().returnType();
- while(it.hasNext()) {
- retType = InternalTypeUtilities.getCommonLosslessConversionType(retType, it.next().type().returnType());
- }
- return retType;
- }
-}