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374 lines
12 KiB
Java
374 lines
12 KiB
Java
/*
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* Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.reflect.misc;
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import java.io.EOFException;
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import java.security.AllPermission;
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import java.security.AccessController;
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import java.security.PermissionCollection;
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import java.security.SecureClassLoader;
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import java.security.PrivilegedExceptionAction;
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import java.security.CodeSource;
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import java.io.InputStream;
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import java.io.BufferedInputStream;
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import java.io.IOException;
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import java.net.URL;
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import java.net.URLConnection;
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import java.lang.reflect.Method;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Modifier;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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class Trampoline {
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static {
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if (Trampoline.class.getClassLoader() == null) {
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throw new Error(
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"Trampoline must not be defined by the bootstrap classloader");
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}
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}
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private static void ensureInvocableMethod(Method m)
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throws InvocationTargetException
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{
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Class<?> clazz = m.getDeclaringClass();
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if (clazz.equals(AccessController.class) ||
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clazz.equals(Method.class) ||
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clazz.getName().startsWith("java.lang.invoke."))
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throw new InvocationTargetException(
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new UnsupportedOperationException("invocation not supported"));
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}
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private static Object invoke(Method m, Object obj, Object[] params)
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throws InvocationTargetException, IllegalAccessException
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{
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ensureInvocableMethod(m);
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return m.invoke(obj, params);
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}
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}
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/*
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* Create a trampoline class.
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*/
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public final class MethodUtil extends SecureClassLoader {
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private static final String MISC_PKG = "sun.reflect.misc.";
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private static final String TRAMPOLINE = MISC_PKG + "Trampoline";
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private static final Method bounce = getTrampoline();
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private MethodUtil() {
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super();
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}
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public static Method getMethod(Class<?> cls, String name, Class<?>[] args)
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throws NoSuchMethodException {
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ReflectUtil.checkPackageAccess(cls);
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return cls.getMethod(name, args);
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}
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public static Method[] getMethods(Class<?> cls) {
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ReflectUtil.checkPackageAccess(cls);
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return cls.getMethods();
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}
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/*
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* Discover the public methods on public classes
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* and interfaces accessible to any caller by calling
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* Class.getMethods() and walking towards Object until
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* we're done.
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*/
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public static Method[] getPublicMethods(Class<?> cls) {
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// compatibility for update release
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if (System.getSecurityManager() == null) {
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return cls.getMethods();
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}
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Map<Signature, Method> sigs = new HashMap<Signature, Method>();
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while (cls != null) {
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boolean done = getInternalPublicMethods(cls, sigs);
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if (done) {
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break;
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}
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getInterfaceMethods(cls, sigs);
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cls = cls.getSuperclass();
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}
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return sigs.values().toArray(new Method[sigs.size()]);
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}
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/*
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* Process the immediate interfaces of this class or interface.
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*/
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private static void getInterfaceMethods(Class<?> cls,
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Map<Signature, Method> sigs) {
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Class<?>[] intfs = cls.getInterfaces();
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for (int i=0; i < intfs.length; i++) {
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Class<?> intf = intfs[i];
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boolean done = getInternalPublicMethods(intf, sigs);
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if (!done) {
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getInterfaceMethods(intf, sigs);
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}
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}
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}
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/*
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*
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* Process the methods in this class or interface
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*/
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private static boolean getInternalPublicMethods(Class<?> cls,
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Map<Signature, Method> sigs) {
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Method[] methods = null;
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try {
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/*
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* This class or interface is non-public so we
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* can't use any of it's methods. Go back and
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* try again with a superclass or superinterface.
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*/
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if (!Modifier.isPublic(cls.getModifiers())) {
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return false;
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}
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if (!ReflectUtil.isPackageAccessible(cls)) {
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return false;
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}
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methods = cls.getMethods();
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} catch (SecurityException se) {
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return false;
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}
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/*
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* Check for inherited methods with non-public
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* declaring classes. They might override and hide
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* methods from their superclasses or
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* superinterfaces.
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*/
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boolean done = true;
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for (int i=0; i < methods.length; i++) {
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Class<?> dc = methods[i].getDeclaringClass();
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if (!Modifier.isPublic(dc.getModifiers())) {
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done = false;
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break;
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}
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}
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if (done) {
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/*
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* We're done. Spray all the methods into
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* the list and then we're out of here.
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*/
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for (int i=0; i < methods.length; i++) {
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addMethod(sigs, methods[i]);
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}
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} else {
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/*
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* Simulate cls.getDeclaredMethods() by
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* stripping away inherited methods.
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*/
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for (int i=0; i < methods.length; i++) {
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Class<?> dc = methods[i].getDeclaringClass();
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if (cls.equals(dc)) {
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addMethod(sigs, methods[i]);
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}
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}
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}
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return done;
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}
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private static void addMethod(Map<Signature, Method> sigs, Method method) {
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Signature signature = new Signature(method);
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if (!sigs.containsKey(signature)) {
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sigs.put(signature, method);
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} else if (!method.getDeclaringClass().isInterface()){
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/*
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* Superclasses beat interfaces.
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*/
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Method old = sigs.get(signature);
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if (old.getDeclaringClass().isInterface()) {
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sigs.put(signature, method);
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}
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}
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}
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/**
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* A class that represents the unique elements of a method that will be a
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* key in the method cache.
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*/
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private static class Signature {
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private final String methodName;
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private final Class<?>[] argClasses;
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private final int hashCode;
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Signature(Method m) {
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this.methodName = m.getName();
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this.argClasses = m.getParameterTypes();
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this.hashCode = methodName.hashCode() + Arrays.hashCode(argClasses);
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}
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@Override public int hashCode() {
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return hashCode;
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}
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@Override public boolean equals(Object o2) {
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if (this == o2) {
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return true;
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}
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Signature that = (Signature)o2;
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if (!(methodName.equals(that.methodName))) {
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return false;
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}
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if (argClasses.length != that.argClasses.length) {
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return false;
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}
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for (int i = 0; i < argClasses.length; i++) {
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if (!(argClasses[i] == that.argClasses[i])) {
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return false;
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}
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}
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return true;
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}
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}
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/*
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* Bounce through the trampoline.
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*/
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public static Object invoke(Method m, Object obj, Object[] params)
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throws InvocationTargetException, IllegalAccessException {
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try {
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return bounce.invoke(null, new Object[] {m, obj, params});
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} catch (InvocationTargetException ie) {
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Throwable t = ie.getCause();
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if (t instanceof InvocationTargetException) {
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throw (InvocationTargetException)t;
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} else if (t instanceof IllegalAccessException) {
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throw (IllegalAccessException)t;
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} else if (t instanceof RuntimeException) {
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throw (RuntimeException)t;
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} else if (t instanceof Error) {
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throw (Error)t;
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} else {
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throw new Error("Unexpected invocation error", t);
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}
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} catch (IllegalAccessException iae) {
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// this can't happen
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throw new Error("Unexpected invocation error", iae);
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}
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}
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private static Method getTrampoline() {
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try {
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return AccessController.doPrivileged(
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new PrivilegedExceptionAction<Method>() {
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public Method run() throws Exception {
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Class<?> t = getTrampolineClass();
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Class<?>[] types = {
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Method.class, Object.class, Object[].class
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};
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Method b = t.getDeclaredMethod("invoke", types);
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b.setAccessible(true);
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return b;
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}
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});
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} catch (Exception e) {
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throw new InternalError("bouncer cannot be found", e);
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}
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}
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protected synchronized Class<?> loadClass(String name, boolean resolve)
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throws ClassNotFoundException
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{
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// First, check if the class has already been loaded
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ReflectUtil.checkPackageAccess(name);
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Class<?> c = findLoadedClass(name);
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if (c == null) {
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try {
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c = findClass(name);
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} catch (ClassNotFoundException e) {
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// Fall through ...
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}
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if (c == null) {
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c = getParent().loadClass(name);
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}
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}
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if (resolve) {
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resolveClass(c);
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}
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return c;
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}
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protected Class<?> findClass(final String name)
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throws ClassNotFoundException
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{
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if (!name.startsWith(MISC_PKG)) {
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throw new ClassNotFoundException(name);
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}
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String path = name.replace('.', '/').concat(".class");
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try {
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InputStream in = Object.class.getModule().getResourceAsStream(path);
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if (in != null) {
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try (in) {
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byte[] b = in.readAllBytes();
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return defineClass(name, b);
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}
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}
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} catch (IOException e) {
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throw new ClassNotFoundException(name, e);
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}
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throw new ClassNotFoundException(name);
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}
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/*
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* Define the proxy classes
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*/
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private Class<?> defineClass(String name, byte[] b) throws IOException {
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CodeSource cs = new CodeSource(null, (java.security.cert.Certificate[])null);
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if (!name.equals(TRAMPOLINE)) {
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throw new IOException("MethodUtil: bad name " + name);
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}
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return defineClass(name, b, 0, b.length, cs);
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}
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protected PermissionCollection getPermissions(CodeSource codesource)
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{
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PermissionCollection perms = super.getPermissions(codesource);
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perms.add(new AllPermission());
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return perms;
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}
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private static Class<?> getTrampolineClass() {
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try {
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return Class.forName(TRAMPOLINE, true, new MethodUtil());
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} catch (ClassNotFoundException e) {
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}
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return null;
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}
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}
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