org.eclectic.idc.jvm.runtime.IdcClassLoader.java Source code

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Here is the source code for org.eclectic.idc.jvm.runtime.IdcClassLoader.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the 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.
 */
package org.eclectic.idc.jvm.runtime;

import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;

import org.apache.commons.io.IOUtils;
import org.apache.commons.javaflow.bytecode.BytecodeClassLoader;
import org.apache.commons.javaflow.bytecode.transformation.ResourceTransformer;
import org.apache.commons.javaflow.bytecode.transformation.asm.AsmClassTransformer;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.util.ASMifierClassVisitor;

public final class IdcClassLoader extends BytecodeClassLoader {

    private final ResourceTransformer transformer;
    private final Set<String> instrument;
    private final Set<String> load;
    private final HashMap<String, BytecodeClass> byteCodeClasses = new HashMap<String, BytecodeClass>();

    public static class BytecodeClass {
        private byte[] bytes;
        private String className;

        public BytecodeClass(String className, byte[] bytes) {
            this.className = className;
            this.bytes = bytes;
        }
    }

    public IdcClassLoader(final BytecodeClass[] dynamicClasses, final Class<?>[] pInstrument,
            final Class<?>[] pLoad) {

        this(new AsmClassTransformer(), pInstrument, pLoad);

        for (int i = 0; i < dynamicClasses.length; i++)
            this.byteCodeClasses.put(dynamicClasses[i].className, dynamicClasses[i]);
    }

    public Class<?> loadGeneratedClass(String className, byte[] bytes) {
        return defineClass(className, bytes, 0, bytes.length, getClass().getProtectionDomain());
    }

    /*
    final ClassTransformerClassLoader classloader =
        new ClassTransformerClassLoader(
              new AsmClassTransformer(),
              new Class[] { // instrument
                 BlackRed.class,
                 ClassAccess1.class,
                 ClassAccess2.class,
                 CounterFlow.class,
                 DefaultConstructor.class,
                 Simple.class,
                 NewObject.class,
                 NoReference.class,
                 SimpleSerializable.class,
                 RewriteBugs.class,
                 SimpleTryCatch.class,
                 SimpleSynchronized.class,
                 Stack.class,   
                 }, 
              new Class[] { // load
                 VerificationTestCase.class,
                 SerializationTestCase.class
                 }  
              );
        
    final TestSuite suite = new TestSuite();
    suite.setName("ASM");
    suite.addTestSuite((Class<? extends TestCase>)classloader.loadClass(VerificationTestCase.class.getName()));
    suite.addTestSuite((Class<? extends TestCase>)classloader.loadClass(SerializationTestCase.class.getName()));
    return suite;
    */
    // END-OF JESUSC

    public IdcClassLoader(final ResourceTransformer pTransformer, final Class<?>[] pInstrument,
            final Class<?>[] pLoad) {
        instrument = new HashSet<String>(pInstrument.length);
        for (int i = 0; i < pInstrument.length; i++) {
            instrument.add(pInstrument[i].getName());
        }

        load = new HashSet<String>(pLoad.length);
        for (int i = 0; i < pLoad.length; i++) {
            load.add(pLoad[i].getName());
        }

        transformer = pTransformer;
    }

    protected byte[] transform(final String pName, final InputStream pClassStream) throws IOException {
        System.err.println("Transforming " + pName);

        final byte[] oldClass = IOUtils.toByteArray(pClassStream);
        final byte[] newClass = transformer.transform(oldClass);

        // CheckClassAdapter.verify(new ClassReader(newClass), true);

        new ClassReader(oldClass).accept(new ASMifierClassVisitor(
                new PrintWriter(new FileOutputStream(transformer.getClass().getSimpleName() + pName + ".old"))), 0);

        new ClassReader(newClass).accept(new ASMifierClassVisitor(
                new PrintWriter(new FileOutputStream(transformer.getClass().getSimpleName() + pName + ".new"))), 0);

        return newClass;
    }

    public Class<?> loadClass(final String name) throws ClassNotFoundException {

        if (byteCodeClasses.containsKey(name)) {
            try {
                byte[] bytecode = transform(name, new ByteArrayInputStream(byteCodeClasses.get(name).bytes));
                return super.defineClass(name, bytecode, 0, bytecode.length);
            } catch (IOException ex) {
                ex.printStackTrace();
                throw new ClassNotFoundException(name + " " + ex.getMessage(), ex);
            }
        }

        final int i = name.indexOf('$');
        final String key;

        if (i == -1) {
            key = name;
        } else {
            key = name.substring(0, i);
        }

        if (instrument.contains(key) || load.contains(key)) {

            try {
                final InputStream is = getClass().getResourceAsStream("/" + name.replace('.', '/') + ".class");

                final byte[] bytecode;

                if (instrument.contains(key)) {
                    System.err.println("Instrumenting: " + name);
                    bytecode = transform(name, is);
                } else {
                    System.err.println("Loading: " + name);
                    bytecode = new ClassReader(is).b;
                }

                return super.defineClass(name, bytecode, 0, bytecode.length);

            } catch (Throwable ex) {
                // System.err.println("Load error: " + ex.toString());
                ex.printStackTrace();
                throw new ClassNotFoundException(name + " " + ex.getMessage(), ex);
            }
        }

        // System.err.println("Delegating: " + name);
        return super.loadClass(name);
    }

}