CallerSensitiveDynamicMethod.java revision 1651:703729e9c5dd
1/* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26/* 27 * This file is available under and governed by the GNU General Public 28 * License version 2 only, as published by the Free Software Foundation. 29 * However, the following notice accompanied the original version of this 30 * file, and Oracle licenses the original version of this file under the BSD 31 * license: 32 */ 33/* 34 Copyright 2009-2013 Attila Szegedi 35 36 Licensed under both the Apache License, Version 2.0 (the "Apache License") 37 and the BSD License (the "BSD License"), with licensee being free to 38 choose either of the two at their discretion. 39 40 You may not use this file except in compliance with either the Apache 41 License or the BSD License. 42 43 If you choose to use this file in compliance with the Apache License, the 44 following notice applies to you: 45 46 You may obtain a copy of the Apache License at 47 48 http://www.apache.org/licenses/LICENSE-2.0 49 50 Unless required by applicable law or agreed to in writing, software 51 distributed under the License is distributed on an "AS IS" BASIS, 52 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 53 implied. See the License for the specific language governing 54 permissions and limitations under the License. 55 56 If you choose to use this file in compliance with the BSD License, the 57 following notice applies to you: 58 59 Redistribution and use in source and binary forms, with or without 60 modification, are permitted provided that the following conditions are 61 met: 62 * Redistributions of source code must retain the above copyright 63 notice, this list of conditions and the following disclaimer. 64 * Redistributions in binary form must reproduce the above copyright 65 notice, this list of conditions and the following disclaimer in the 66 documentation and/or other materials provided with the distribution. 67 * Neither the name of the copyright holder nor the names of 68 contributors may be used to endorse or promote products derived from 69 this software without specific prior written permission. 70 71 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 72 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 73 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 74 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER 75 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 76 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 77 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 78 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 79 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 80 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 81 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 82*/ 83 84package jdk.dynalink.beans; 85 86import java.lang.invoke.MethodHandle; 87import java.lang.invoke.MethodHandles; 88import java.lang.invoke.MethodType; 89import java.lang.reflect.AccessibleObject; 90import java.lang.reflect.Constructor; 91import java.lang.reflect.Member; 92import java.lang.reflect.Method; 93import java.lang.reflect.Modifier; 94import java.security.AccessControlContext; 95import java.security.AccessController; 96import java.security.PrivilegedAction; 97import jdk.dynalink.CallSiteDescriptor; 98import jdk.dynalink.SecureLookupSupplier; 99import jdk.dynalink.internal.AccessControlContextFactory; 100import jdk.dynalink.linker.support.Lookup; 101 102/** 103 * A dynamic method bound to exactly one Java method or constructor that is caller sensitive. Since the target method is 104 * caller sensitive, it doesn't cache a method handle but rather uses the passed lookup object in 105 * {@link #getTarget(CallSiteDescriptor)} to unreflect a method handle from the reflective member on 106 * every request. 107 */ 108class CallerSensitiveDynamicMethod extends SingleDynamicMethod { 109 private static final AccessControlContext GET_LOOKUP_CONTEXT = 110 AccessControlContextFactory.createAccessControlContext( 111 SecureLookupSupplier.GET_LOOKUP_PERMISSION_NAME); 112 113 // Typed as "AccessibleObject" as it can be either a method or a constructor. 114 // If we were Java8-only, we could use java.lang.reflect.Executable 115 private final AccessibleObject target; 116 private final MethodType type; 117 118 CallerSensitiveDynamicMethod(final AccessibleObject target) { 119 super(getName(target)); 120 this.target = target; 121 this.type = getMethodType(target); 122 } 123 124 private static String getName(final AccessibleObject target) { 125 final Member m = (Member)target; 126 final boolean constructor = m instanceof Constructor; 127 return getMethodNameWithSignature(getMethodType(target), constructor ? m.getName() : 128 getClassAndMethodName(m.getDeclaringClass(), m.getName()), !constructor); 129 } 130 131 @Override 132 MethodType getMethodType() { 133 return type; 134 } 135 136 private static MethodType getMethodType(final AccessibleObject ao) { 137 final boolean isMethod = ao instanceof Method; 138 final Class<?> rtype = isMethod ? ((Method)ao).getReturnType() : ((Constructor<?>)ao).getDeclaringClass(); 139 final Class<?>[] ptypes = isMethod ? ((Method)ao).getParameterTypes() : ((Constructor<?>)ao).getParameterTypes(); 140 final MethodType type = MethodType.methodType(rtype, ptypes); 141 final Member m = (Member)ao; 142 return type.insertParameterTypes(0, 143 isMethod ? 144 Modifier.isStatic(m.getModifiers()) ? 145 Object.class : 146 m.getDeclaringClass() : 147 StaticClass.class); 148 } 149 150 @Override 151 boolean isVarArgs() { 152 return target instanceof Method ? ((Method)target).isVarArgs() : ((Constructor<?>)target).isVarArgs(); 153 } 154 155 @Override 156 MethodHandle getTarget(final CallSiteDescriptor desc) { 157 final MethodHandles.Lookup lookup = AccessController.doPrivileged( 158 (PrivilegedAction<MethodHandles.Lookup>)()->desc.getLookup(), 159 GET_LOOKUP_CONTEXT); 160 161 if(target instanceof Method) { 162 final MethodHandle mh = Lookup.unreflectCallerSensitive(lookup, (Method)target); 163 if(Modifier.isStatic(((Member)target).getModifiers())) { 164 return StaticClassIntrospector.editStaticMethodHandle(mh); 165 } 166 return mh; 167 } 168 return StaticClassIntrospector.editConstructorMethodHandle(Lookup.unreflectConstructorCallerSensitive(lookup, 169 (Constructor<?>)target)); 170 } 171 172 @Override 173 boolean isConstructor() { 174 return target instanceof Constructor; 175 } 176} 177