193 lines
6.7 KiB
Java
193 lines
6.7 KiB
Java
/*
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* Copyright (c) 2002-2011 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.util.mapped;
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import org.lwjgl.LWJGLUtil;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.net.URLClassLoader;
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/**
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* This classloader is responsible for applying the bytecode transformation to mapped objects.
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* The transformation can either be applied using a Java agent, or with the convenient {@link #fork} method.
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*
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* @author Riven
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*/
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public class MappedObjectClassLoader extends URLClassLoader {
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static final String MAPPEDOBJECT_PACKAGE_PREFIX = MappedObjectClassLoader.class.getPackage().getName() + ".";
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static boolean FORKED;
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/**
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* Forks the specified class containing a main method, passing the specified arguments. See
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* {@link org.lwjgl.test.mapped.TestMappedObject} for example usage.
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*
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* @param mainClass the class containing the main method
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* @param args the arguments to pass
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*
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* @return true if the fork was successful.
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*/
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public static boolean fork(Class<?> mainClass, String[] args) {
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if ( FORKED ) {
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return false;
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}
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FORKED = true;
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try {
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MappedObjectClassLoader loader = new MappedObjectClassLoader(mainClass);
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loader.loadMappedObject();
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Class<?> replacedMainClass = loader.loadClass(mainClass.getName());
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Method mainMethod = replacedMainClass.getMethod("main", String[].class);
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mainMethod.invoke(null, new Object[] { args });
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} catch (InvocationTargetException exc) {
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Thread.currentThread().getUncaughtExceptionHandler().uncaughtException(Thread.currentThread(), exc.getCause());
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} catch (Throwable cause) {
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throw new Error("failed to fork", cause);
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}
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return true;
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}
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private MappedObjectClassLoader(Class<?> mainClass) {
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super(((URLClassLoader)mainClass.getClassLoader()).getURLs());
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}
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protected synchronized Class<?> loadMappedObject() throws ClassNotFoundException {
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final String name = MappedObject.class.getName();
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String className = name.replace('.', '/');
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byte[] bytecode = readStream(this.getResourceAsStream(className.concat(".class")));
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long t0 = System.nanoTime();
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bytecode = MappedObjectTransformer.transformMappedObject(bytecode);
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long t1 = System.nanoTime();
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total_time_transforming += (t1 - t0);
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if ( MappedObjectTransformer.PRINT_ACTIVITY )
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printActivity(className, t0, t1);
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Class<?> clazz = super.defineClass(name, bytecode, 0, bytecode.length);
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resolveClass(clazz);
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return clazz;
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}
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private static long total_time_transforming;
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@Override
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protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
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if ( name.startsWith("java.")
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|| name.startsWith("javax.")
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|| name.startsWith("sun.")
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|| name.startsWith("sunw.")
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|| name.startsWith("org.objectweb.asm.")
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)
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return super.loadClass(name, resolve);
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final String className = name.replace('.', '/');
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final boolean inThisPackage = name.startsWith(MAPPEDOBJECT_PACKAGE_PREFIX);
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if ( inThisPackage && (
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name.equals(MappedObjectClassLoader.class.getName())
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|| name.equals((MappedObjectTransformer.class.getName()))
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|| name.equals((CacheUtil.class.getName()))
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) )
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return super.loadClass(name, resolve);
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byte[] bytecode = readStream(this.getResourceAsStream(className.concat(".class")));
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// Classes in this package do not get transformed, but need to go through here because we have transformed MappedObject.
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if ( !(inThisPackage && name.substring(MAPPEDOBJECT_PACKAGE_PREFIX.length()).indexOf('.') == -1) ) {
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long t0 = System.nanoTime();
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final byte[] newBytecode = MappedObjectTransformer.transformMappedAPI(className, bytecode);
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long t1 = System.nanoTime();
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total_time_transforming += (t1 - t0);
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if ( bytecode != newBytecode ) {
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bytecode = newBytecode;
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if ( MappedObjectTransformer.PRINT_ACTIVITY )
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printActivity(className, t0, t1);
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}
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}
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Class<?> clazz = super.defineClass(name, bytecode, 0, bytecode.length);
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if ( resolve )
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resolveClass(clazz);
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return clazz;
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}
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private static void printActivity(final String className, final long t0, final long t1) {
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final StringBuilder msg = new StringBuilder(MappedObjectClassLoader.class.getSimpleName() + ": " + className);
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if ( MappedObjectTransformer.PRINT_TIMING )
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msg.append("\n\ttransforming took " + (t1 - t0) / 1000 + " micros (total: " + (total_time_transforming / 1000 / 1000) + "ms)");
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LWJGLUtil.log(msg);
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}
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private static byte[] readStream(InputStream in) {
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byte[] bytecode = new byte[256];
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int len = 0;
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try {
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while ( true ) {
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if ( bytecode.length == len )
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bytecode = copyOf(bytecode, len * 2);
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int got = in.read(bytecode, len, bytecode.length - len);
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if ( got == -1 )
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break;
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len += got;
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}
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} catch (IOException exc) {
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// stop!
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} finally {
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try {
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in.close();
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} catch (IOException exc) {
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// ignore...
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}
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}
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return copyOf(bytecode, len);
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}
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private static byte[] copyOf(byte[] original, int newLength) {
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byte[] copy = new byte[newLength];
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System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength));
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return copy;
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}
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} |