/* | |
* 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.apache.aries.proxy.impl.common; | |
import static org.apache.aries.proxy.impl.common.AbstractWovenProxyAdapter.DISPATCHER_FIELD; | |
import static org.apache.aries.proxy.impl.common.AbstractWovenProxyAdapter.DISPATCHER_TYPE; | |
import static org.apache.aries.proxy.impl.common.AbstractWovenProxyAdapter.OBJECT_TYPE; | |
import org.objectweb.asm.Label; | |
import org.objectweb.asm.MethodVisitor; | |
import org.objectweb.asm.Type; | |
import org.objectweb.asm.commons.Method; | |
public final class WovenProxyConcreteMethodAdapter extends AbstractWovenProxyMethodAdapter { | |
/** Jump here to start executing the original method body **/ | |
private final Label executeDispatch = new Label(); | |
public WovenProxyConcreteMethodAdapter(MethodVisitor mv, int access, String name, | |
String desc, String[] exceptions, String methodStaticFieldName, Method currentTransformMethod, | |
Type typeBeingWoven, Type methodDeclaringType, boolean isMethodDeclaringTypeInterface) { | |
//If we're running on Java 6+ We need to inline any JSR instructions because we're computing stack frames. | |
//otherwise we can save the overhead | |
super(mv, access, name, desc, methodStaticFieldName, currentTransformMethod, typeBeingWoven, | |
methodDeclaringType, isMethodDeclaringTypeInterface, false); | |
} | |
/** | |
* We weave instructions before the normal method body. We must be careful not | |
* to violate the "rules" of Java (e.g. that try blocks cannot intersect, but | |
* can be nested). We must also not violate the ordering that ASM expects, so | |
* we must not call visitMaxs, or define labels before a try/catch that uses | |
* them! | |
*/ | |
@Override | |
public final void visitCode() | |
{ | |
//Notify our parent that the method code is starting. This must happen first | |
mv.visitCode(); | |
//unwrap for equals if we need to | |
if(currentTransformMethod.getName().equals("equals") && | |
currentTransformMethod.getArgumentTypes().length == 1 && | |
currentTransformMethod.getArgumentTypes()[0].equals(OBJECT_TYPE)) { | |
unwrapEqualsArgument(); | |
} | |
//Check if we have a dispatcher, if so then we need to dispatch! | |
loadThis(); | |
getField(typeBeingWoven, DISPATCHER_FIELD, DISPATCHER_TYPE); | |
ifNonNull(executeDispatch); | |
} | |
@Override | |
public final void visitMaxs(int stack, int locals) { | |
//Mark this location for continuing execution when a dispatcher is set | |
mark(executeDispatch); | |
//Write the dispatcher code in here | |
writeDispatcher(); | |
mv.visitMaxs(stack, locals); | |
} | |
} |