| /* |
| * 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.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.dynalink.SecureLookupSupplier; |
| import jdk.dynalink.internal.InternalTypeUtilities; |
| import jdk.dynalink.linker.LinkerServices; |
| import jdk.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 SecureLookupSupplier lookupSupplier; |
| 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, |
| final SecureLookupSupplier lookupSupplier) { |
| this.parent = parent; |
| this.callSiteClassLoader = callSiteClassLoader; |
| final Class<?> commonRetType = getCommonReturnType(methodHandles); |
| this.callSiteType = callSiteType.changeReturnType(commonRetType); |
| this.linkerServices = linkerServices; |
| this.lookupSupplier = lookupSupplier; |
| |
| 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: { |
| final List<MethodHandle> fmethods = methods; |
| method = linkerServices.getWithLookup( |
| ()->SingleDynamicMethod.getInvocation(fmethods.get(0), callSiteType, linkerServices), |
| lookupSupplier); |
| break; |
| } |
| default: { |
| // This is unfortunate - invocation time ambiguity. |
| 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; |
| } |
| } |