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

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

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/**********************************************************************
 * This file is part of "Object Teams Dynamic Runtime Environment"
 * 
 * Copyright 2009, 2014 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.bytecode.Method;
import org.eclipse.objectteams.otredyn.transformer.names.ConstantMembers;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.LabelNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;

/**
 * Create the code for the dispatch from a base class to the teams 
 * in the original method. <br/> <br/>
 * The code was generated as follows: <br/>
 * <code>
 *     Teams[] teams = TeamManager.getTeams(joinpointId) <br/>
 *     if (teams == null) { <br/>
 *         Object args[] = {arg1, ..., argn}; <br/>
 *         return callOrig(boundMethodId, args); <br/>
 *     } <br/>
 *     <br/>
 *     Team t = teams[0]; <br/>
 *     int[] callinIds = TeamManager.getCallinIds(joinpointId); <br/>
 *     Object[] args = {arg1, ... , argn};
 *     return team._OT$callAllBindings(this, teams, 0, callinIds, boundMethodId, args);
 * } <br/>
 * </code>
 * @author Oliver Frank
 */
public class CreateDispatchCodeInOrgMethodAdapter extends AbstractCreateDispatchCodeAdapter {
    private Method method;
    private int joinPointId;
    private int boundMethodId;

    public CreateDispatchCodeInOrgMethodAdapter(Method method, int joinPointId, int boundMethodId) {
        super(true);
        this.method = method;
        this.joinPointId = joinPointId;
        this.boundMethodId = boundMethodId;
    }

    @Override
    public boolean transform() {
        MethodNode orgMethod = getMethod(method);
        if ((orgMethod.access & Opcodes.ACC_ABSTRACT) != 0)
            return false;

        orgMethod.instructions.clear();
        orgMethod.instructions.add(getDispatchCode(orgMethod, joinPointId, boundMethodId));
        orgMethod.maxStack = getMaxStack();
        orgMethod.maxLocals = getMaxLocals();
        return true;
    }

    @Override
    protected InsnList getBoxedArguments(Type[] args) {
        return getBoxingInstructions(args, true);
    }

    @Override
    protected InsnList createInstructionsToCheackTeams(MethodNode method) {
        InsnList instructions = new InsnList();
        instructions.add(new InsnNode(Opcodes.DUP));
        LabelNode label = new LabelNode();
        //if (teams == null) {
        instructions.add(new JumpInsnNode(Opcodes.IFNONNULL, label));
        instructions.add(new InsnNode(Opcodes.POP));
        //put the boundMethodId on the stack
        instructions.add(createLoadIntConstant(boundMethodId));
        Type[] args = Type.getArgumentTypes(method.desc);
        // box the arguments
        instructions.add(getBoxingInstructions(args, (method.access & Opcodes.ACC_STATIC) != 0));
        //callOrigStatic(boundMethodId, args);
        instructions.add(new MethodInsnNode(Opcodes.INVOKESTATIC, name, ConstantMembers.callOrigStatic.getName(),
                ConstantMembers.callOrigStatic.getSignature()));
        Type returnType = Type.getReturnType(method.desc);
        instructions.add(getUnboxingInstructionsForReturnValue(returnType));
        instructions.add(label);

        return instructions;
    }

}