Wed, 03 Jul 2013 12:39:28 +0200
8010946: AccessControl.doPrivileged is broken when called from js script
Reviewed-by: jlaskey, sundar
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 */
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
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.
40 You may not use this file except in compliance with either the Apache
41 License or the BSD License.
43 If you choose to use this file in compliance with the Apache License, the
44 following notice applies to you:
46 You may obtain a copy of the Apache License at
48 http://www.apache.org/licenses/LICENSE-2.0
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.
56 If you choose to use this file in compliance with the BSD License, the
57 following notice applies to you:
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.
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 */
84 package jdk.internal.dynalink.beans;
86 import java.lang.invoke.MethodHandle;
87 import java.lang.invoke.MethodHandles;
88 import java.lang.invoke.MethodType;
89 import java.lang.reflect.Array;
90 import java.util.StringTokenizer;
91 import jdk.internal.dynalink.CallSiteDescriptor;
92 import jdk.internal.dynalink.linker.LinkerServices;
93 import jdk.internal.dynalink.support.Guards;
95 /**
96 * Base class for dynamic methods that dispatch to a single target Java method or constructor. Handles adaptation of the
97 * target method to a call site type (including mapping variable arity methods to a call site signature with different
98 * arity).
99 * @author Attila Szegedi
100 * @version $Id: $
101 */
102 abstract class SingleDynamicMethod extends DynamicMethod {
103 SingleDynamicMethod(String name) {
104 super(name);
105 }
107 /**
108 * Returns true if this method is variable arity.
109 * @return true if this method is variable arity.
110 */
111 abstract boolean isVarArgs();
113 /**
114 * Returns this method's native type.
115 * @return this method's native type.
116 */
117 abstract MethodType getMethodType();
119 /**
120 * Given a specified lookup, returns a method handle to this method's target.
121 * @param lookup the lookup to use.
122 * @return the handle to this method's target method.
123 */
124 abstract MethodHandle getTarget(MethodHandles.Lookup lookup);
126 @Override
127 MethodHandle getInvocation(CallSiteDescriptor callSiteDescriptor, LinkerServices linkerServices) {
128 return getInvocation(getTarget(callSiteDescriptor.getLookup()), callSiteDescriptor.getMethodType(),
129 linkerServices);
130 }
132 @Override
133 SingleDynamicMethod getMethodForExactParamTypes(String paramTypes) {
134 return typeMatchesDescription(paramTypes, getMethodType()) ? this : null;
135 }
137 @Override
138 boolean contains(SingleDynamicMethod method) {
139 return getMethodType().parameterList().equals(method.getMethodType().parameterList());
140 }
142 static String getMethodNameWithSignature(MethodType type, String methodName) {
143 final String typeStr = type.toString();
144 final int retTypeIndex = typeStr.lastIndexOf(')') + 1;
145 int secondParamIndex = typeStr.indexOf(',') + 1;
146 if(secondParamIndex == 0) {
147 secondParamIndex = retTypeIndex - 1;
148 }
149 return typeStr.substring(retTypeIndex) + " " + methodName + "(" + typeStr.substring(secondParamIndex, retTypeIndex);
150 }
152 /**
153 * Given a method handle and a call site type, adapts the method handle to the call site type. Performs type
154 * conversions as needed using the specified linker services, and in case that the method handle is a vararg
155 * collector, matches it to the arity of the call site.
156 * @param target the method handle to adapt
157 * @param callSiteType the type of the call site
158 * @param linkerServices the linker services used for type conversions
159 * @return the adapted method handle.
160 */
161 static MethodHandle getInvocation(MethodHandle target, MethodType callSiteType, LinkerServices linkerServices) {
162 final MethodType methodType = target.type();
163 final int paramsLen = methodType.parameterCount();
164 final boolean varArgs = target.isVarargsCollector();
165 final MethodHandle fixTarget = varArgs ? target.asFixedArity() : target;
166 final int fixParamsLen = varArgs ? paramsLen - 1 : paramsLen;
167 final int argsLen = callSiteType.parameterCount();
168 if(argsLen < fixParamsLen) {
169 // Less actual arguments than number of fixed declared arguments; can't invoke.
170 return null;
171 }
172 // Method handle has the same number of fixed arguments as the call site type
173 if(argsLen == fixParamsLen) {
174 // Method handle that matches the number of actual arguments as the number of fixed arguments
175 final MethodHandle matchedMethod;
176 if(varArgs) {
177 // If vararg, add a zero-length array of the expected type as the last argument to signify no variable
178 // arguments.
179 matchedMethod = MethodHandles.insertArguments(fixTarget, fixParamsLen, Array.newInstance(
180 methodType.parameterType(fixParamsLen).getComponentType(), 0));
181 } else {
182 // Otherwise, just use the method
183 matchedMethod = fixTarget;
184 }
185 return createConvertingInvocation(matchedMethod, linkerServices, callSiteType);
186 }
188 // What's below only works for varargs
189 if(!varArgs) {
190 return null;
191 }
193 final Class<?> varArgType = methodType.parameterType(fixParamsLen);
194 // Handle a somewhat sinister corner case: caller passes exactly one argument in the vararg position, and we
195 // must handle both a prepacked vararg array as well as a genuine 1-long vararg sequence.
196 if(argsLen == paramsLen) {
197 final Class<?> callSiteLastArgType = callSiteType.parameterType(fixParamsLen);
198 if(varArgType.isAssignableFrom(callSiteLastArgType)) {
199 // Call site signature guarantees we'll always be passed a single compatible array; just link directly
200 // to the method, introducing necessary conversions. Also, preserve it being a variable arity method.
201 return createConvertingInvocation(target, linkerServices, callSiteType).asVarargsCollector(
202 callSiteLastArgType);
203 }
204 if(!linkerServices.canConvert(callSiteLastArgType, varArgType)) {
205 // Call site signature guarantees the argument can definitely not be an array (i.e. it is primitive);
206 // link immediately to a vararg-packing method handle.
207 return createConvertingInvocation(collectArguments(fixTarget, argsLen), linkerServices, callSiteType);
208 }
209 // Call site signature makes no guarantees that the single argument in the vararg position will be
210 // compatible across all invocations. Need to insert an appropriate guard and fall back to generic vararg
211 // method when it is not.
212 return MethodHandles.guardWithTest(Guards.isInstance(varArgType, fixParamsLen, callSiteType),
213 createConvertingInvocation(fixTarget, linkerServices, callSiteType),
214 createConvertingInvocation(collectArguments(fixTarget, argsLen), linkerServices, callSiteType));
215 }
217 // Remaining case: more than one vararg.
218 return createConvertingInvocation(collectArguments(fixTarget, argsLen), linkerServices, callSiteType);
219 }
221 /**
222 * Creates a method handle out of the original target that will collect the varargs for the exact component type of
223 * the varArg array. Note that this will nicely trigger language-specific type converters for exactly those varargs
224 * for which it is necessary when later passed to linkerServices.convertArguments().
225 *
226 * @param target the original method handle
227 * @param parameterCount the total number of arguments in the new method handle
228 * @return a collecting method handle
229 */
230 static MethodHandle collectArguments(MethodHandle target, final int parameterCount) {
231 final MethodType methodType = target.type();
232 final int fixParamsLen = methodType.parameterCount() - 1;
233 final Class<?> arrayType = methodType.parameterType(fixParamsLen);
234 return target.asCollector(arrayType, parameterCount - fixParamsLen);
235 }
237 private static MethodHandle createConvertingInvocation(final MethodHandle sizedMethod,
238 final LinkerServices linkerServices, final MethodType callSiteType) {
239 return linkerServices.asType(sizedMethod, callSiteType);
240 }
242 private static boolean typeMatchesDescription(String paramTypes, MethodType type) {
243 final StringTokenizer tok = new StringTokenizer(paramTypes, ", ");
244 for(int i = 1; i < type.parameterCount(); ++i) { // i = 1 as we ignore the receiver
245 if(!(tok.hasMoreTokens() && typeNameMatches(tok.nextToken(), type.parameterType(i)))) {
246 return false;
247 }
248 }
249 return !tok.hasMoreTokens();
250 }
252 private static boolean typeNameMatches(String typeName, Class<?> type) {
253 return typeName.equals(typeName.indexOf('.') == -1 ? type.getSimpleName() : type.getCanonicalName());
254 }
255 }