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File org.dgpf.gp.vm.instructions.arith.Exchange.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-06-26 08:21:11
 * Original Filename: org.dgpf.gp.vm.instructions.arith.Exchange.java
 * Version          : 1.0.0
 * Last modification: 2006-07-15
 *                by: Thomas Weise
 * 
 * License          : GNU LESSER GENERAL PUBLIC LICENSE
 *                    Version 2.1, February 1999
 *                    You should have received a copy of this license along
 *                    with this library; if not, write to the Free Software
 *                    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *                    MA 02111-1307, USA or download the license under
 *                    http://www.gnu.org/copyleft/lesser.html.
 *                    
 * Warranty         : This software is provided "as is" 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.
 */

 
package org.dgpf.gp.vm.instructions.arith;

import org.dgpf.gp.vm.base.IInstructionHandler;
import org.dgpf.gp.vm.base.VM;
import org.dgpf.gp.vm.instructions.BasicCosts;
import org.dgpf.gp.vm.instructions.base.MemInstr2;

/**
 * The exchange operation.
 *
 * @author Thomas Weise
 */

public class Exchange extends MemInstr2
  {
/**
 * The serial version uid.
 */

  private static final long serialVersionUID = 1;
  
/**
 * Create a new exchange instruction.
 * @param p_addr_1      The first address.
 * @param p_relative_1  <code>true</code> for relative memory access,
 *                      <code>false</code> for direct access for the first
 *                      address.
 * @param p_addr_2      The second address.
 * @param p_relative_2  <code>true</code> for relative memory access,
 *                      <code>false</code> for direct access for the
 *                      second address.
 */

  public  Exchange      (final int      p_addr_1,
                         final boolean  p_relative_1,
                         final int      p_addr_2,
                         final boolean  p_relative_2)
    {
    super(p_addr_1, p_relative_1, p_addr_2, p_relative_2);
    }
  
  
/**
 * Execute this instruction on a virtual machine.
 * @param p_machine The virtual machine to execute on.
 * @return  The cost of the execution of the last instruction.
 */

  @Override
  protected   final double  execute (final VM p_machine)
    {
    int l_a, l_b;
    
    l_a = this.read_1(p_machine);
    l_b = this.read_2(p_machine);
    
    this.write_1(p_machine, l_b);
    this.write_2(p_machine, l_a);
    
    return BasicCosts.XCHG_COSTS;
    }
  

/**
 * Store this objects content into a string builder.
 * @param p_sb  The string builder to store stuff into.
 */

  @Override
  public  final void  to_string (final StringBuilder p_sb)
    {
    p_sb.append("xchg ");
    this.mem_1_str(p_sb);
    p_sb.append(", ");
    this.mem_2_str(p_sb);
    }
  

/**
 * Obtain the instruction handler to be used for this sort of instructions.
 * @return The instruction handler to be used for this sort of instructions.
 */

  @Override
  public  final IInstructionHandler get_handler()
    {
    return ExchangeHandler.INSTANCE;
    }
  
  
 


/**
 * Check whether the address parameter of the index <code>p_index</code>
 * is read from or written to.
 * @param p_index The index of the address parameter wanted.
 * @return Or-ed combination of <code>1</code> if this addres is read from,
 *         <code>2</code> if it is written to.
 */

  @Override
  protected final int get_access (final int p_index)
    {
    return (((p_index > 0) && (p_index < 3)) ? 3 : 0);
    }
  
/**
 * Get a string that can be copy-pasted into a java file an that creates
 * this instruction.
 * @param p_b The string builder to add with. 
 */

  @Override
  public final void    to_creation_string (final StringBuilder p_b)
    {
    p_b.append("new Exchange(");
    super.to_creation_string(p_b);
    p_b.append(')');
    }
  }

File Information:

file name:Exchange.java
package:org.dgpf.gp.vm.instructions.arith
qualified name:org.dgpf.gp.vm.instructions.arith.Exchange.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/vm/instructions/arith/Exchange.java
size:4.147 KB (4247 B)
uploaded: 2015-07-22 04:10:58 GMT+0000
last update: 2006-07-16 06:45:23 GMT+0000
last access: 2017-11-22 09:19:12 GMT+0000

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