// TODO: Implement byte code instrumentation to replace calls to methods that do not exist in
// proxy by invoke(callee,methodHash/methodName,args)
protected void instrument(
CtClass toManipulate,
String extRef,
ClassPool externalPool,
String proxyName,
ProxyLoader loader)
throws NotFoundException, CannotCompileException {
ClassPool proxyPool = getPool(externalPool, loader);
// javassist bytecode manipulation
// LOG.info(" onWrite: getting proxy "+proxyName+" from pool "+loader.getClassPath());
CtClass proxyCtClass = proxyPool.get(proxyName);
// LOG.info(" onWrite: getting external class "+extRef+" from pool "+extCop.getClassPath());
CtClass extRefCtClass = externalPool.get(extRef);
if (proxyCtClass.getSuperclass() == extRefCtClass) {
CodeConverter conv = new CodeConverter();
conv.replaceNew(extRefCtClass, proxyCtClass, TransparentProxyFactory.factoryMethod);
// replace any occurence of "new $extRefClass ()" by "$proxyClass.$factoryMathod" in code of
// $className
toManipulate.instrument(conv);
// e.g. "new TestComponentMain()" is replaced by
// "Proxy4_TestComponentMain.newExternalInstance()" in bytecode of class
// "ComponentUsingAnotherOne"
// LOG.info(" Finished bytecode instrumentation of "+toManipulate.getName());
}
}
public static void main(String[] args)
throws NotFoundException, CannotCompileException, IOException {
ClassPool classPool = ClassPool.getDefault();
classPool.appendClassPath(new ClassClassPath(JavassistLengthBug.class));
CtClass dummyClass = classPool.get("net.fwbrasil.activate.entity.Dummy");
dummyClass.instrument(
new ExprEditor() {
public void edit(FieldAccess fa) {
if (fa.isReader() && fa.getFieldName().equals("length"))
try {
fa.replace("$_ = ($r) this.length.substring(1);");
} catch (CannotCompileException e) {
e.printStackTrace();
}
}
});
dummyClass.toClass();
new Dummy().print();
}
/**
* Transforms the call side pointcuts.
*
* @param context the transformation context
* @param klass the class set.
*/
public void transform(final Context context, final Klass klass)
throws NotFoundException, CannotCompileException {
List definitions = SystemDefinitionContainer.getDefinitionsContext();
m_joinPointIndex =
TransformationUtil.getJoinPointIndex(klass.getCtClass()); // TODO thread safe reentrant
for (Iterator it = definitions.iterator(); it.hasNext(); ) {
final SystemDefinition definition = (SystemDefinition) it.next();
final CtClass ctClass = klass.getCtClass();
final ClassMetaData classMetaData = context.getMetaDataMaker().createClassMetaData(ctClass);
// filter caller classes
if (classFilter(definition, classMetaData, ctClass)) {
continue;
}
ctClass.instrument(
new ExprEditor() {
public void edit(MethodCall methodCall) throws CannotCompileException {
try {
CtBehavior where = null;
try {
where = methodCall.where();
} catch (RuntimeException e) {
// <clinit> access leads to a bug in Javassist
where = ctClass.getClassInitializer();
}
// filter caller methods
if (methodFilterCaller(where)) {
return;
}
// get the callee method name, signature and class name
CtMethod calleeMethod = methodCall.getMethod();
String calleeClassName = methodCall.getClassName();
// filter callee classes
if (!definition.inIncludePackage(calleeClassName)) {
return;
}
// filter callee methods
if (methodFilterCallee(calleeMethod)) {
return;
}
// create the class meta-data
ClassMetaData calleeSideClassMetaData;
try {
calleeSideClassMetaData =
context
.getMetaDataMaker()
.createClassMetaData(context.getClassPool().get(calleeClassName));
} catch (NotFoundException e) {
// TODO - AV - 20040507 small fix for test.aopc. that use on the fly generated
// classes
if (calleeClassName.equals(ctClass.getName())) {
calleeSideClassMetaData = classMetaData;
} else {
throw new WrappedRuntimeException(e);
}
}
// create the method meta-data
MethodMetaData calleeSideMethodMetaData =
JavassistMetaDataMaker.createMethodMetaData(methodCall.getMethod());
// is this a caller side method pointcut?
if (definition.isPickedOutByCallPointcut(
calleeSideClassMetaData, calleeSideMethodMetaData)) {
// // TODO: should this caller data be passed to the
// join point? It is possible.
// String callerMethodName = callerBehaviour.getName();
// String callerMethodSignature =
// callerBehaviour.getSignature();
// CtClass[] callerMethodParameterTypes =
// callerBehaviour.getParameterTypes();
// int callerMethodModifiers =
// callerBehaviour.getModifiers();
// check the callee class is not the same as target class, if that is the case
// then we have have class loaded and set in the ___AW_clazz already
String declaringClassMethodName = TransformationUtil.STATIC_CLASS_FIELD;
CtMethod method = methodCall.getMethod();
CtClass declaringClass = method.getDeclaringClass();
if (!declaringClass
.getName()
.replace('/', '.')
.equals(where.getDeclaringClass().getName().replace('/', '.'))) {
declaringClassMethodName = addCalleeMethodDeclaringClassField(ctClass, method);
}
// call the wrapper method instead of the callee method
StringBuffer body = new StringBuffer();
StringBuffer callBody = new StringBuffer();
callBody.append(TransformationUtil.JOIN_POINT_MANAGER_FIELD);
callBody.append('.');
callBody.append(TransformationUtil.PROCEED_WITH_CALL_JOIN_POINT_METHOD);
callBody.append('(');
callBody.append(TransformationUtil.calculateHash(method));
callBody.append(',');
callBody.append(m_joinPointIndex);
callBody.append(", args");
callBody.append(", $0, declaringClassMethodName, ");
callBody.append(TransformationUtil.JOIN_POINT_TYPE_METHOD_CALL);
callBody.append(");");
body.append('{');
if (method.getParameterTypes().length > 0) {
body.append("Object[] args = $args; ");
} else {
body.append("Object[] args = null; ");
}
body.append("Class declaringClassMethodName = ");
body.append(declaringClassMethodName);
body.append("; ");
if (methodCall.getMethod().getReturnType() == CtClass.voidType) {
body.append("$_ = ").append(callBody.toString()).append("}");
} else if (!methodCall.getMethod().getReturnType().isPrimitive()) {
body.append("$_ = ($r)");
body.append(callBody.toString());
body.append("}");
} else {
String localResult = TransformationUtil.ASPECTWERKZ_PREFIX + "res";
body.append("Object ").append(localResult).append(" = ");
body.append(callBody.toString());
body.append("if (").append(localResult).append(" != null)");
body.append("$_ = ($r) ").append(localResult).append("; else ");
body.append("$_ = ");
body.append(
JavassistHelper.getDefaultPrimitiveValue(
methodCall.getMethod().getReturnType()));
body.append("; }");
}
methodCall.replace(body.toString());
context.markAsAdvised();
m_joinPointIndex++;
}
} catch (NotFoundException nfe) {
nfe.printStackTrace();
// TODO: should we swallow this exception?
}
}
});
}
TransformationUtil.setJoinPointIndex(klass.getCtClass(), m_joinPointIndex);
}
public void onLoad(ClassPool pool, String cname)
throws NotFoundException, CannotCompileException {
System.out.println("Dissecting class " + cname);
CtClass clas = pool.get(cname);
clas.instrument(new VerboseEditor());
}