/*

 * $Id$

 *

 * Copyright (C) 2003-2009 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;

import org.jnode.util.NumberUtils;

import org.jnode.annotation.MagicPermission;

import org.jnode.vm.scheduler.VmProcessor;

import org.vmmagic.unboxed.Address;

/**

 * Address is not a normal Java object. Instead it is used as a reference

 * to a virtual memory address. Variables of this type are not considered to

 * be objects by the garbage collector.

 *

 * @author epr

 */

@MagicPermission

public abstract class VmAddress extends VmSystemObject {

    /**

     * Convert the given address to a String.

     * The length of the string depends of the reference size of

     * the current architecture.

     *

     * @param addr an address

     * @return a hexadecimal string rendering of the address

     */

    public static String toString(VmAddress addr) {

        final int refsize = VmProcessor.current().getArchitecture().getReferenceSize();

        if (refsize == 4) {

            return NumberUtils.hex(Address.fromAddress(addr).toInt());

        } else {

            return NumberUtils.hex(Address.fromAddress(addr).toLong());

        }

    }

}