org.eclipse.objectteams.otredyn.bytecode.asm.CreateSwitchForCallAllBindingsNode.java Source code

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Here is the source code for org.eclipse.objectteams.otredyn.bytecode.asm.CreateSwitchForCallAllBindingsNode.java

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/**********************************************************************
 * This file is part of "Object Teams Dynamic Runtime Environment"
 * 
 * Copyright 2009, 2012 Oliver Frank and others.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Please visit http://www.eclipse.org/objectteams for updates and contact.
 * 
 * Contributors:
 *      Oliver Frank - Initial API and implementation
 *      Stephan Herrmann - Initial API and implementation
 **********************************************************************/
package org.eclipse.objectteams.otredyn.bytecode.asm;

import org.eclipse.objectteams.otredyn.transformer.names.ConstantMembers;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.IntInsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.LabelNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;

/**
 * Initially prepares the method callAllBindings as follows: <br/><br/>
 * <code>
 * switch (boundMethodId) {<br/>
 * default:<br/>
 *     break;<br/> 
 * }<br/>
 * <br/>
 * return callOrig(boundMethodId, args);<br/>
 * </code>
 * @author Oliver Frank
 */
public class CreateSwitchForCallAllBindingsNode extends CreateSwitchAdapter {
    private Type[] args;
    private LabelNode gotoLabel;

    public CreateSwitchForCallAllBindingsNode() {
        super(ConstantMembers.callAllBindingsClient);
    }

    @Override
    protected void addInstructionForDefaultLabel(MethodNode method) {
        gotoLabel = new LabelNode();
        method.instructions.add(new JumpInsnNode(Opcodes.GOTO, gotoLabel));
    }

    @Override
    protected void addPostSwitchInstructions(MethodNode method) {
        method.instructions.add(gotoLabel);
        method.instructions.add(new IntInsnNode(Opcodes.ALOAD, 0));

        args = Type.getArgumentTypes(method.desc);
        int length = args.length;
        for (int i = 0; i < length; i++) {
            Type arg = args[i];
            method.instructions.add(new IntInsnNode(arg.getOpcode(Opcodes.ILOAD), i + 1));
        }

        // return callOrig(boundMethodId, args);
        method.instructions.add(new MethodInsnNode(Opcodes.INVOKEVIRTUAL, name, ConstantMembers.callOrig.getName(),
                ConstantMembers.callOrig.getSignature()));
        method.instructions.add(new InsnNode(Opcodes.ARETURN));
    }

    @Override
    protected int getMaxStack() {
        return args.length + 1;
    }

}