--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk/internal/dynalink/support/Lookup.java Thu Feb 14 13:22:26 2013 +0100
@@ -0,0 +1,361 @@
+/*
+ * 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.support;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+/**
+ * A wrapper around MethodHandles.Lookup that masks checked exceptions in those cases when you're looking up methods
+ * within your own codebase (therefore it is an error if they are not present).
+ *
+ * @author Attila Szegedi
+ */
+public class Lookup {
+ private final MethodHandles.Lookup lookup;
+
+ /**
+ * Creates a new instance, bound to an instance of {@link java.lang.invoke.MethodHandles.Lookup}.
+ *
+ * @param lookup the {@link java.lang.invoke.MethodHandles.Lookup} it delegates to.
+ */
+ public Lookup(MethodHandles.Lookup lookup) {
+ this.lookup = lookup;
+ }
+
+ /**
+ * A canonical Lookup object that wraps {@link MethodHandles#publicLookup()}.
+ */
+ public static final Lookup PUBLIC = new Lookup(MethodHandles.publicLookup());
+
+ /**
+ * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflect(Method)}, converting any encountered
+ * {@link IllegalAccessException} into an {@link IllegalAccessError}.
+ *
+ * @param m the method to unreflect
+ * @return the unreflected method handle.
+ */
+ public MethodHandle unreflect(Method m) {
+ try {
+ return lookup.unreflect(m);
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect method " + m);
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+
+ /**
+ * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflectGetter(Field)}, converting any encountered
+ * {@link IllegalAccessException} into an {@link IllegalAccessError}.
+ *
+ * @param f the field for which a getter is unreflected
+ * @return the unreflected field getter handle.
+ */
+ public MethodHandle unreflectGetter(Field f) {
+ try {
+ return lookup.unreflectGetter(f);
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect getter for field " + f);
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+ /**
+ * Performs a {@link java.lang.invoke.MethodHandles.Lookup#findGetter(Class, String, Class)}, converting any
+ * encountered {@link IllegalAccessException} into an {@link IllegalAccessError} and {@link NoSuchFieldException}
+ * into a {@link NoSuchFieldError}.
+ *
+ * @param refc the class declaring the field
+ * @param name the name of the field
+ * @param type the type of the field
+ * @return the unreflected field getter handle.
+ * @throws IllegalAccessError if the field is inaccessible.
+ * @throws NoSuchFieldError if the field does not exist.
+ */
+ public MethodHandle findGetter(Class<?>refc, String name, Class<?> type) {
+ try {
+ return lookup.findGetter(refc, name, type);
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to access getter for field " + refc.getName() +
+ "." + name + " of type " + type.getName());
+ ee.initCause(e);
+ throw ee;
+ } catch(NoSuchFieldException e) {
+ final NoSuchFieldError ee = new NoSuchFieldError("Failed to find getter for field " + refc.getName() +
+ "." + name + " of type " + type.getName());
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+ /**
+ * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflectSetter(Field)}, converting any encountered
+ * {@link IllegalAccessException} into an {@link IllegalAccessError}.
+ *
+ * @param f the field for which a setter is unreflected
+ * @return the unreflected field setter handle.
+ */
+ public MethodHandle unreflectSetter(Field f) {
+ try {
+ return lookup.unreflectSetter(f);
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect setter for field " + f);
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+ /**
+ * Performs a {@link java.lang.invoke.MethodHandles.Lookup#unreflectConstructor(Constructor)}, converting any
+ * encountered {@link IllegalAccessException} into an {@link IllegalAccessError}.
+ *
+ * @param c the constructor to unreflect
+ * @return the unreflected constructor handle.
+ */
+ public MethodHandle unreflectConstructor(Constructor<?> c) {
+ try {
+ return lookup.unreflectConstructor(c);
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to unreflect constructor " + c);
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+ /**
+ * Performs a findSpecial on the underlying lookup, except for the backport where it rather uses unreflect. Converts
+ * any encountered {@link IllegalAccessException} into an {@link IllegalAccessError} and a
+ * {@link NoSuchMethodException} into a {@link NoSuchMethodError}.
+ *
+ * @param declaringClass class declaring the method
+ * @param name the name of the method
+ * @param type the type of the method
+ * @return a method handle for the method
+ * @throws IllegalAccessError if the method is inaccessible.
+ * @throws NoSuchMethodError if the method does not exist.
+ */
+ public MethodHandle findSpecial(Class<?> declaringClass, String name, MethodType type) {
+ try {
+ if(Backport.inUse) {
+ final Method m = declaringClass.getDeclaredMethod(name, type.parameterArray());
+ if(!Modifier.isPublic(declaringClass.getModifiers()) || !Modifier.isPublic(m.getModifiers())) {
+ m.setAccessible(true);
+ }
+ return unreflect(m);
+ } else {
+ return lookup.findSpecial(declaringClass, name, type, declaringClass);
+ }
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to access special method " + methodDescription(
+ declaringClass, name, type));
+ ee.initCause(e);
+ throw ee;
+ } catch(NoSuchMethodException e) {
+ final NoSuchMethodError ee = new NoSuchMethodError("Failed to find special method " + methodDescription(
+ declaringClass, name, type));
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+ private static String methodDescription(Class<?> declaringClass, String name, MethodType type) {
+ return declaringClass.getName() + "#" + name + type;
+ }
+
+ /**
+ * Performs a findStatic on the underlying lookup. Converts any encountered {@link IllegalAccessException} into an
+ * {@link IllegalAccessError} and a {@link NoSuchMethodException} into a {@link NoSuchMethodError}.
+ *
+ * @param declaringClass class declaring the method
+ * @param name the name of the method
+ * @param type the type of the method
+ * @return a method handle for the method
+ * @throws IllegalAccessError if the method is inaccessible.
+ * @throws NoSuchMethodError if the method does not exist.
+ */
+ public MethodHandle findStatic(Class<?> declaringClass, String name, MethodType type) {
+ try {
+ return lookup.findStatic(declaringClass, name, type);
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to access static method " + methodDescription(
+ declaringClass, name, type));
+ ee.initCause(e);
+ throw ee;
+ } catch(NoSuchMethodException e) {
+ final NoSuchMethodError ee = new NoSuchMethodError("Failed to find static method " + methodDescription(
+ declaringClass, name, type));
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+ /**
+ * Performs a findVirtual on the underlying lookup. Converts any encountered {@link IllegalAccessException} into an
+ * {@link IllegalAccessError} and a {@link NoSuchMethodException} into a {@link NoSuchMethodError}.
+ *
+ * @param declaringClass class declaring the method
+ * @param name the name of the method
+ * @param type the type of the method
+ * @return a method handle for the method
+ * @throws IllegalAccessError if the method is inaccessible.
+ * @throws NoSuchMethodError if the method does not exist.
+ */
+ public MethodHandle findVirtual(Class<?> declaringClass, String name, MethodType type) {
+ try {
+ return lookup.findVirtual(declaringClass, name, type);
+ } catch(IllegalAccessException e) {
+ final IllegalAccessError ee = new IllegalAccessError("Failed to access virtual method " + methodDescription(
+ declaringClass, name, type));
+ ee.initCause(e);
+ throw ee;
+ } catch(NoSuchMethodException e) {
+ final NoSuchMethodError ee = new NoSuchMethodError("Failed to find virtual method " + methodDescription(
+ declaringClass, name, type));
+ ee.initCause(e);
+ throw ee;
+ }
+ }
+
+ /**
+ * Given a lookup, finds using {@link #findSpecial(Class, String, MethodType)} a method on that lookup's class.
+ * Useful in classes' code for convenient linking to their own privates.
+ * @param lookup the lookup for the class
+ * @param name the name of the method
+ * @param rtype the return type of the method
+ * @param ptypes the parameter types of the method
+ * @return the method handle for the method
+ */
+ public static MethodHandle findOwnSpecial(MethodHandles.Lookup lookup, String name, Class<?> rtype, Class<?>... ptypes) {
+ return new Lookup(lookup).findOwnSpecial(name, rtype, ptypes);
+ }
+
+
+ /**
+ * Finds using {@link #findSpecial(Class, String, MethodType)} a method on that lookup's class. Useful in classes'
+ * code for convenient linking to their own privates. It's easier to use than {@code findSpecial} in that you can
+ * just list the parameter types, and don't have to specify lookup class.
+ * @param name the name of the method
+ * @param rtype the return type of the method
+ * @param ptypes the parameter types of the method
+ * @return the method handle for the method
+ */
+ public MethodHandle findOwnSpecial(String name, Class<?> rtype, Class<?>... ptypes) {
+ return findSpecial(lookup.lookupClass(), name, MethodType.methodType(rtype, ptypes));
+ }
+
+ /**
+ * Given a lookup, finds using {@link #findStatic(Class, String, MethodType)} a method on that lookup's class.
+ * Useful in classes' code for convenient linking to their own privates. It's easier to use than {@code findStatic}
+ * in that you can just list the parameter types, and don't have to specify lookup class.
+ * @param lookup the lookup for the class
+ * @param name the name of the method
+ * @param rtype the return type of the method
+ * @param ptypes the parameter types of the method
+ * @return the method handle for the method
+ */
+ public static MethodHandle findOwnStatic(MethodHandles.Lookup lookup, String name, Class<?> rtype, Class<?>... ptypes) {
+ return new Lookup(lookup).findOwnStatic(name, rtype, ptypes);
+ }
+
+ /**
+ * Finds using {@link #findStatic(Class, String, MethodType)} a method on that lookup's class. Useful in classes'
+ * code for convenient linking to their own privates. It's easier to use than {@code findStatic} in that you can
+ * just list the parameter types, and don't have to specify lookup class.
+ * @param name the name of the method
+ * @param rtype the return type of the method
+ * @param ptypes the parameter types of the method
+ * @return the method handle for the method
+ */
+ public MethodHandle findOwnStatic(String name, Class<?> rtype, Class<?>... ptypes) {
+ return findStatic(lookup.lookupClass(), name, MethodType.methodType(rtype, ptypes));
+ }
+}