Operand.java

/*
 * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *  
 */

/* 
 * Original code for this class taken from the Java HotSpot VM. 
 * Modified for use with the Jakstab project. All modifications 
 * Copyright 2007-2015 Johannes Kinder <jk@jakstab.org>
 */

package org.jakstab.asm;

import org.jakstab.rtl.Context;
import org.jakstab.rtl.expressions.ExpressionFactory;
import org.jakstab.rtl.expressions.RTLExpression;

/**
 * Operands are used as instruction parameters. An Operand is one of
 * Immediate, Register, MemoryOperand, or Address.  
 */
public abstract class Operand {
	
	public String toString(long currentPc, SymbolFinder symFinder) {
		return this.toString();
	}
	
	/**
	 * Return an evaluated copy of this operand.
	 * 
	 * @param ctx the context to use
	 * @return an evaluated copy or this operand, if identical
	 */
	public Operand evaluate(Context ctx) {
		RTLExpression var = ExpressionFactory.createOperand(this);
		RTLExpression eval = var.evaluate(ctx);
		if (var.equals(eval)) 
			return this;
		else {
			Operand res = OperandFactory.createOperand(eval);
			if (res == null)
				return this;
			else
				return res;
		}
	}
	
}