Sat, 09 Mar 2013 21:49:32 +0530
8009559: clean up method handle lookup code.
Reviewed-by: ahgross, jlaskey, attila, sundar
attila@90 | 1 | /* |
attila@90 | 2 | * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
attila@90 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
attila@90 | 4 | * |
attila@90 | 5 | * This code is free software; you can redistribute it and/or modify it |
attila@90 | 6 | * under the terms of the GNU General Public License version 2 only, as |
attila@90 | 7 | * published by the Free Software Foundation. Oracle designates this |
attila@90 | 8 | * particular file as subject to the "Classpath" exception as provided |
attila@90 | 9 | * by Oracle in the LICENSE file that accompanied this code. |
attila@90 | 10 | * |
attila@90 | 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
attila@90 | 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
attila@90 | 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
attila@90 | 14 | * version 2 for more details (a copy is included in the LICENSE file that |
attila@90 | 15 | * accompanied this code). |
attila@90 | 16 | * |
attila@90 | 17 | * You should have received a copy of the GNU General Public License version |
attila@90 | 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
attila@90 | 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
attila@90 | 20 | * |
attila@90 | 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
attila@90 | 22 | * or visit www.oracle.com if you need additional information or have any |
attila@90 | 23 | * questions. |
attila@90 | 24 | */ |
attila@90 | 25 | |
attila@90 | 26 | /* |
attila@90 | 27 | * This file is available under and governed by the GNU General Public |
attila@90 | 28 | * License version 2 only, as published by the Free Software Foundation. |
attila@90 | 29 | * However, the following notice accompanied the original version of this |
attila@90 | 30 | * file, and Oracle licenses the original version of this file under the BSD |
attila@90 | 31 | * license: |
attila@90 | 32 | */ |
attila@90 | 33 | /* |
attila@90 | 34 | Copyright 2009-2013 Attila Szegedi |
attila@90 | 35 | |
attila@90 | 36 | Licensed under both the Apache License, Version 2.0 (the "Apache License") |
attila@90 | 37 | and the BSD License (the "BSD License"), with licensee being free to |
attila@90 | 38 | choose either of the two at their discretion. |
attila@90 | 39 | |
attila@90 | 40 | You may not use this file except in compliance with either the Apache |
attila@90 | 41 | License or the BSD License. |
attila@90 | 42 | |
attila@90 | 43 | If you choose to use this file in compliance with the Apache License, the |
attila@90 | 44 | following notice applies to you: |
attila@90 | 45 | |
attila@90 | 46 | You may obtain a copy of the Apache License at |
attila@90 | 47 | |
attila@90 | 48 | http://www.apache.org/licenses/LICENSE-2.0 |
attila@90 | 49 | |
attila@90 | 50 | Unless required by applicable law or agreed to in writing, software |
attila@90 | 51 | distributed under the License is distributed on an "AS IS" BASIS, |
attila@90 | 52 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
attila@90 | 53 | implied. See the License for the specific language governing |
attila@90 | 54 | permissions and limitations under the License. |
attila@90 | 55 | |
attila@90 | 56 | If you choose to use this file in compliance with the BSD License, the |
attila@90 | 57 | following notice applies to you: |
attila@90 | 58 | |
attila@90 | 59 | Redistribution and use in source and binary forms, with or without |
attila@90 | 60 | modification, are permitted provided that the following conditions are |
attila@90 | 61 | met: |
attila@90 | 62 | * Redistributions of source code must retain the above copyright |
attila@90 | 63 | notice, this list of conditions and the following disclaimer. |
attila@90 | 64 | * Redistributions in binary form must reproduce the above copyright |
attila@90 | 65 | notice, this list of conditions and the following disclaimer in the |
attila@90 | 66 | documentation and/or other materials provided with the distribution. |
attila@90 | 67 | * Neither the name of the copyright holder nor the names of |
attila@90 | 68 | contributors may be used to endorse or promote products derived from |
attila@90 | 69 | this software without specific prior written permission. |
attila@90 | 70 | |
attila@90 | 71 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
attila@90 | 72 | IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
attila@90 | 73 | TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A |
attila@90 | 74 | PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER |
attila@90 | 75 | BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
attila@90 | 76 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
attila@90 | 77 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
attila@90 | 78 | BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
attila@90 | 79 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
attila@90 | 80 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
attila@90 | 81 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
attila@90 | 82 | */ |
attila@90 | 83 | |
attila@90 | 84 | package jdk.internal.dynalink.beans; |
attila@90 | 85 | |
attila@90 | 86 | import java.lang.invoke.MethodHandle; |
attila@90 | 87 | import java.lang.invoke.MethodHandles; |
attila@90 | 88 | import java.lang.invoke.MethodType; |
attila@90 | 89 | import java.lang.reflect.Array; |
attila@90 | 90 | import java.lang.reflect.Constructor; |
attila@90 | 91 | import java.util.ArrayList; |
attila@90 | 92 | import java.util.List; |
attila@90 | 93 | import jdk.internal.dynalink.CallSiteDescriptor; |
attila@90 | 94 | import jdk.internal.dynalink.beans.GuardedInvocationComponent.ValidationType; |
attila@90 | 95 | import jdk.internal.dynalink.linker.GuardedInvocation; |
attila@90 | 96 | import jdk.internal.dynalink.linker.GuardingDynamicLinker; |
attila@90 | 97 | import jdk.internal.dynalink.linker.LinkRequest; |
attila@90 | 98 | import jdk.internal.dynalink.linker.LinkerServices; |
attila@90 | 99 | import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker; |
attila@90 | 100 | import jdk.internal.dynalink.support.Lookup; |
attila@90 | 101 | |
attila@90 | 102 | /** |
attila@90 | 103 | * Provides a linker for the {@link StaticClass} objects. |
attila@90 | 104 | * @author Attila Szegedi |
attila@90 | 105 | */ |
attila@90 | 106 | class StaticClassLinker implements TypeBasedGuardingDynamicLinker { |
attila@90 | 107 | private final ClassValue<GuardingDynamicLinker> linkers = new ClassValue<GuardingDynamicLinker>() { |
attila@90 | 108 | @Override |
attila@90 | 109 | protected GuardingDynamicLinker computeValue(Class<?> clazz) { |
attila@90 | 110 | return new SingleClassStaticsLinker(clazz); |
attila@90 | 111 | } |
attila@90 | 112 | }; |
attila@90 | 113 | |
attila@90 | 114 | private static class SingleClassStaticsLinker extends AbstractJavaLinker { |
attila@90 | 115 | private final DynamicMethod constructor; |
attila@90 | 116 | |
attila@90 | 117 | SingleClassStaticsLinker(Class<?> clazz) { |
attila@90 | 118 | super(clazz, IS_CLASS.bindTo(clazz)); |
attila@90 | 119 | // Map "staticClassObject.class" to StaticClass.getRepresentedClass(). Some adventurous soul could subclass |
attila@90 | 120 | // StaticClass, so we use INSTANCE_OF validation instead of EXACT_CLASS. |
attila@90 | 121 | setPropertyGetter("class", GET_CLASS, ValidationType.INSTANCE_OF); |
attila@90 | 122 | constructor = createConstructorMethod(clazz); |
attila@90 | 123 | } |
attila@90 | 124 | |
attila@90 | 125 | /** |
attila@90 | 126 | * Creates a dynamic method containing all overloads of a class' public constructor |
attila@90 | 127 | * @param clazz the target class |
attila@90 | 128 | * @return a dynamic method containing all overloads of a class' public constructor. If the class has no public |
attila@90 | 129 | * constructors, returns null. |
attila@90 | 130 | */ |
attila@90 | 131 | private static DynamicMethod createConstructorMethod(Class<?> clazz) { |
attila@90 | 132 | if(clazz.isArray()) { |
attila@90 | 133 | final MethodHandle boundArrayCtor = ARRAY_CTOR.bindTo(clazz.getComponentType()); |
attila@90 | 134 | return new SimpleDynamicMethod(drop(boundArrayCtor.asType(boundArrayCtor.type().changeReturnType( |
attila@90 | 135 | clazz))), clazz, "<init>"); |
attila@90 | 136 | } |
attila@90 | 137 | |
attila@90 | 138 | final Constructor<?>[] ctrs = clazz.getConstructors(); |
attila@90 | 139 | final List<MethodHandle> mhs = new ArrayList<>(ctrs.length); |
attila@90 | 140 | for(int i = 0; i < ctrs.length; ++i) { |
sundar@133 | 141 | mhs.add(drop(SafeUnreflector.unreflectConstructor(ctrs[i]))); |
attila@90 | 142 | } |
attila@90 | 143 | return createDynamicMethod(mhs, clazz, "<init>"); |
attila@90 | 144 | } |
attila@90 | 145 | |
attila@90 | 146 | private static MethodHandle drop(MethodHandle mh) { |
attila@90 | 147 | return MethodHandles.dropArguments(mh, 0, StaticClass.class); |
attila@90 | 148 | } |
attila@90 | 149 | |
attila@90 | 150 | @Override |
attila@90 | 151 | FacetIntrospector createFacetIntrospector() { |
attila@90 | 152 | return new StaticClassIntrospector(clazz); |
attila@90 | 153 | } |
attila@90 | 154 | |
attila@90 | 155 | @Override |
attila@90 | 156 | public GuardedInvocation getGuardedInvocation(LinkRequest request, LinkerServices linkerServices) |
attila@90 | 157 | throws Exception { |
attila@90 | 158 | final GuardedInvocation gi = super.getGuardedInvocation(request, linkerServices); |
attila@90 | 159 | if(gi != null) { |
attila@90 | 160 | return gi; |
attila@90 | 161 | } |
attila@90 | 162 | final CallSiteDescriptor desc = request.getCallSiteDescriptor(); |
attila@90 | 163 | final String op = desc.getNameToken(CallSiteDescriptor.OPERATOR); |
attila@90 | 164 | final MethodType methodType = desc.getMethodType(); |
attila@90 | 165 | if("new" == op && constructor != null) { |
attila@90 | 166 | final MethodHandle ctorInvocation = constructor.getInvocation(methodType, linkerServices); |
attila@90 | 167 | if(ctorInvocation != null) { |
attila@90 | 168 | return new GuardedInvocation(ctorInvocation, getClassGuard(methodType)); |
attila@90 | 169 | } |
attila@90 | 170 | } |
attila@90 | 171 | return null; |
attila@90 | 172 | } |
attila@90 | 173 | } |
attila@90 | 174 | |
attila@90 | 175 | @Override |
attila@90 | 176 | public GuardedInvocation getGuardedInvocation(LinkRequest request, LinkerServices linkerServices) throws Exception { |
attila@90 | 177 | final Object receiver = request.getReceiver(); |
attila@90 | 178 | if(receiver instanceof StaticClass) { |
attila@90 | 179 | return linkers.get(((StaticClass)receiver).getRepresentedClass()).getGuardedInvocation(request, |
attila@90 | 180 | linkerServices); |
attila@90 | 181 | } |
attila@90 | 182 | return null; |
attila@90 | 183 | } |
attila@90 | 184 | |
attila@90 | 185 | @Override |
attila@90 | 186 | public boolean canLinkType(Class<?> type) { |
attila@90 | 187 | return type == StaticClass.class; |
attila@90 | 188 | } |
attila@90 | 189 | |
attila@90 | 190 | /*private*/ static final MethodHandle GET_CLASS = new Lookup(MethodHandles.lookup()).findVirtual(StaticClass.class, |
attila@90 | 191 | "getRepresentedClass", MethodType.methodType(Class.class)); |
attila@90 | 192 | |
attila@90 | 193 | /*private*/ static final MethodHandle IS_CLASS = new Lookup(MethodHandles.lookup()).findStatic(StaticClassLinker.class, |
attila@90 | 194 | "isClass", MethodType.methodType(Boolean.TYPE, Class.class, Object.class)); |
attila@90 | 195 | |
attila@90 | 196 | /*private*/ static final MethodHandle ARRAY_CTOR = Lookup.PUBLIC.findStatic(Array.class, "newInstance", |
attila@90 | 197 | MethodType.methodType(Object.class, Class.class, int.class)); |
attila@90 | 198 | |
attila@90 | 199 | @SuppressWarnings("unused") |
attila@90 | 200 | private static boolean isClass(Class<?> clazz, Object obj) { |
attila@90 | 201 | return obj instanceof StaticClass && ((StaticClass)obj).getRepresentedClass() == clazz; |
attila@90 | 202 | } |
attila@101 | 203 | } |