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/*
* Copyright 2010-2012 VMware and contributors
*
* Licensed 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.springsource.loaded.agent;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.springsource.loaded.Constants;
/**
* This bytecode rewriter intercepts calls to generate made in the CGLIB framework and allows us to record what
* generator is called to create the proxy for some type. The same generator can then be driven again if the type is
* reloaded.
*
* @author Andy Clement
* @since 0.8.3
*/
public class CglibPluginCapturing extends ClassVisitor implements Constants {
public static Map, Object[]> clazzToGeneratorStrategyAndClassGeneratorMap = new HashMap, Object[]>();
public static Map, Object[]> clazzToGeneratorStrategyAndFastClassGeneratorMap = new HashMap, Object[]>();
public String prefix;
public static byte[] catchGenerate(byte[] bytesIn) {
ClassReader cr = new ClassReader(bytesIn);
CglibPluginCapturing ca = new CglibPluginCapturing();
cr.accept(ca, 0);
byte[] newbytes = ca.getBytes();
return newbytes;
}
private CglibPluginCapturing() {
super(ASM5, new ClassWriter(0)); // TODO review 0 here
}
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
// The name could be a repackaged form of cglib:
// net/sf/cglib/core/AbstractClassGenerator
// org/springframework/cglib/core/AbstractClassGenerator
int index = name.indexOf("/cglib");
prefix = name.substring(0, index);
super.visit(version, access, name, signature, superName, interfaces);
}
public byte[] getBytes() {
return ((ClassWriter) cv).toByteArray();
}
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
if (name.equals("create")) {
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
return new CreateMethodInterceptor(mv);
}
else {
return super.visitMethod(access, name, desc, signature, exceptions);
}
}
class CreateMethodInterceptor extends MethodVisitor implements Constants {
public CreateMethodInterceptor(MethodVisitor mv) {
super(ASM5, mv);
}
@Override
public void visitCode() {
}
/**
* Recognize a call to 'generate' being made. When we see it add some extra code after it that calls the record
* method in this type so that we can remember the generator used (and drive it again later when the related
* type is reloaded).
*/
@Override
public void visitMethodInsn(final int opcode, final String owner, final String name, final String desc,
final boolean itf) {
super.visitMethodInsn(opcode, owner, name, desc, itf);
if (name.equals("generate")) {
// Code that calls generate:
// ALOAD 0
// GETFIELD net/sf/cglib/core/AbstractClassGenerator.strategy : Lnet/sf/cglib/core/GeneratorStrategy;
// ALOAD 0
// INVOKEINTERFACE net/sf/cglib/core/GeneratorStrategy.generate(Lnet/sf/cglib/core/ClassGenerator;)[B
mv.visitVarInsn(ALOAD, 0); // AbstractClassGenerator instance
mv.visitFieldInsn(GETFIELD, prefix + "/cglib/core/AbstractClassGenerator", "strategy",
"L" + prefix + "/cglib/core/GeneratorStrategy;");
mv.visitVarInsn(ALOAD, 0); // AbstractClassGenerator instance
mv.visitMethodInsn(INVOKESTATIC, "org/springsource/loaded/agent/CglibPluginCapturing", "record",
"(Ljava/lang/Object;Ljava/lang/Object;)V", false);//Lnet/sf/cglib/core/GeneratorStrategy;Lnet/sf/cglib/core/AbstractClassGenerator);");
}
}
}
/**
* The classloader for class artifacts is used to load the generated classes for call sites. We need to rewrite
* these classes because they may be either calling something that disappears on a later reload (so need to fail
* appropriately) or calling something that isnt there on the first load - in this latter case they are changed to
* route the dynamic executor method.
*
* @param a the GeneratorStrategy being used
* @param b the AbstractClassGenerator
*/
public static void record(Object a, Object b) {
// a is a Lnet/sf/cglib/core/GeneratorStrategy;
// b is a Lnet/sf/cglib/core/AbstractClassGenerator (or specifically net/sf/cglib/reflect/FastClass$Generator)
// a is something like 'UndeclaredThrowableStrategy'
// b is an Enhancer: namePrefix="example.Simple" superclass=example.Simple
String generatorName = b.getClass().getName();
if (generatorName.endsWith(".cglib.proxy.Enhancer")) {
try {
Field f = b.getClass().getDeclaredField("superclass");
f.setAccessible(true);
Class clazz = (Class) f.get(b);
// System.out.println("Recording pair " + clazz.getName() + " > " + b);
clazzToGeneratorStrategyAndClassGeneratorMap.put(clazz, new Object[] { a, b });
}
catch (Throwable re) {
re.printStackTrace();
}
}
else if (generatorName.endsWith(".cglib.reflect.FastClass$Generator")) {
try {
Field f = b.getClass().getDeclaredField("type");
f.setAccessible(true);
Class clazz = (Class) f.get(b);
// System.out.println("Recording pair (fastclass) " + clazz.getName() + " > " + b);
clazzToGeneratorStrategyAndFastClassGeneratorMap.put(clazz, new Object[] { a, b });
}
catch (Throwable re) {
re.printStackTrace();
}
}
}
}
