/*
 * $Id$
 *
 * Copyright (C) 2003-2015 JNode.org
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; If not, write to the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package org.jnode.vm.compiler.ir;

import org.jnode.vm.JvmType;

/**
 * @author Madhu Siddalingaiah
 *         <p/>
 *         An operand of an intermediate operation
 *         This could be a constant, local variable, or stack entry
 */
public abstract class Operand<T> {
    /**
     * NOTE: these values *must* be less than 16!!
     *
     * @see #getAddressingMode() below
     */
    public static final int UNKNOWN = 0;
    public static final int BYTE = JvmType.BYTE;
    public static final int SHORT = JvmType.SHORT;
    public static final int CHAR = JvmType.CHAR;
    public static final int INT = JvmType.INT;
    public static final int LONG = JvmType.LONG;
    public static final int FLOAT = JvmType.FLOAT;
    public static final int DOUBLE = JvmType.DOUBLE;
    public static final int REFERENCE = JvmType.REFERENCE;

    /*
      * Addressing mode bits
      */
    private int type;    // One of the above

    public Operand(int type) {
        this.type = type;
    }

    public int getType() {
        return type;
    }

    /**
     * @param type
     */
    public void setType(int type) {
        this.type = type;
    }

    /**
     * @param type
     */
    public void setTypeFromJvmType(int type) {
        //operand type and JVM type are the same
        this.type = type;
    }

    public abstract Operand<T> simplify();

    /**
     * One of AddressingMode constants defined above
     *
     * @return the addressing mode
     */
    public abstract AddressingMode getAddressingMode();
}