org.eclipse.cdt.debug.edc/src/org/eclipse/cdt/debug/edc/internal/eval/ast/engine/instructions/OperatorShiftLeft.java

/*******************************************************************************
 * Copyright (c) 2009, 2010 Nokia 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
 *
 * Contributors:
 * Nokia - Initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.debug.edc.internal.eval.ast.engine.instructions;

import java.math.BigInteger;

import org.eclipse.core.runtime.CoreException;

/*
 * Binary shift left operation "<<"
 */
public class OperatorShiftLeft extends BinaryOperator {

	/**
	 * Constructor for a binary shift left operation "<<"
	 * 
	 * @param start - instruction start
	 */
	public OperatorShiftLeft(int start) {
		this(0, false, start);
	}

	/**
	 * Constructor for a binary shift left operation "<<"
	 * 
	 * @param resultId - for assignment, variable ID of the result 
	 * @param isAssignmentOperator - whether the result is assigned
	 * @param start - instruction start
	 */
	protected OperatorShiftLeft(int resultId, boolean isAssignmentOperator, int start) {
		super(resultId, isAssignmentOperator, start);
	}

	/**
	 * Get int result of applying binary shift left "<<" to two ints
	 * 
	 * @param leftOperand - left int operand
	 * @param rightOperand - right int operand
	 * @return <code>leftOperand</code> << <code>rightOperand</code>
	 * @throws CoreException
	 */
	@Override
	protected int getIntResult(int leftOperand, int rightOperand) throws CoreException {
		return leftOperand << rightOperand;
	}

	/**
	 * Get long result of applying binary shift left "<<" to two longs
	 * 
	 * @param leftOperand - left long operand
	 * @param rightOperand - right long operand
	 * @return <code>leftOperand</code> << <code>rightOperand</code>
	 * @throws CoreException
	 */
	@Override
	protected long getLongResult(long leftOperand, long rightOperand) throws CoreException {
		return leftOperand << rightOperand;
	}

	/**
	 * Get BigInteger result of applying binary shift left "<<" to two BigIntegers
	 * 
	 * @param leftOperand - left BigInteger operand
	 * @param rightOperand - right BigInteger operand
	 * @param length - length in bytes of result
	 * @return <code>leftOperand</code> << <code>rightOperand</code>, truncated to 8 bytes
	 * @throws CoreException
	 */
	@Override
	protected BigInteger getBigIntegerResult(BigInteger leftOperand, BigInteger rightOperand, int length)
			throws CoreException {
		return leftOperand.shiftLeft(rightOperand.intValue()).and(Instruction.Mask8Bytes);
	}

	/**
	 * Get float result of applying binary shift left "<<" to two floats
	 * 
	 * @param leftOperand - left float operand
	 * @param rightOperand - right float operand
	 * @return 0
	 */
	@Override
	protected float getFloatResult(float leftOperand, float rightOperand) {
		return 0;
	}

	/**
	 * Get double result of applying binary shift left "<<" to two doubles
	 * 
	 * @param leftOperand - left double operand
	 * @param rightOperand - right double operand
	 * @return 0
	 */
	@Override
	protected double getDoubleResult(double leftOperand, double rightOperand) {
		return 0;
	}
}