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File org.dgpf.gp.vm.instructions.ctrl.PopHandler.java

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/*
 * Copyright (c) 2006 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2006-07-03 09:40:46
 * Original Filename: org.dgpf.gp.vm.instructions.ctrl.PopHandler.java
 * Version          : 1.0.0
 * Last modification: 2006-07-03
 *                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.ctrl;

import org.dgpf.gp.vm.base.IInstructionHandler;
import org.dgpf.gp.vm.base.Instruction;
import org.dgpf.gp.vm.base.VMContext;
import org.dgpf.gp.vm.instructions.base.MemInstr1Handler;
import org.dgpf.gp.vm.mutation.MutationInfo;


/**
 * The instruction handler for the pop instruction.
 *
 * @author Thomas Weise
 */

public final class       PopHandler 
             extends     MemInstr1Handler
  {
/**
 * The serial version uid.
 */

  private static final long serialVersionUID = 1;
        
/**
 * The globally shared instance of the pop handler.
 */

  public  static  final IInstructionHandler  INSTANCE =
                                        new PopHandler();
  
  
  
/**
 * Create a new pop handler - you cannot do this, use the shared
 * instance.
 * @see #INSTANCE
 */

  private PopHandler()
    {
    super(null);
    }
  
  
/**
 * Create a new randomized instance of this instruction.
 * @param p_context The vm context to be used.
 * @param p_info    The information record holding the infos on the
 *                  instruction to be created.
 * @return  The new instruction instance.
 */

  public  final     Instruction create      (final VMContext    p_context,
                                             final MutationInfo p_info)
    {
    int        l_a;
    boolean    l_b;
       
    do
      {
      l_a = p_context.random_address(p_info);
      l_b = p_context.create_relative();
      } while ((l_a < 0) && (!(l_b)));
    
    return new Pop(l_a, l_b);
    }  

/**
 * This method tells if this instruction can be useful at the beginning of
 * a procedure. A pop, for example, will never be useful, since the stack
 * of a procedure is initially empty.
 * @return <code>true</code> if and only if an instruction is useful at the
 *         beginning of a procedure.
 */

  @Override
  public boolean is_useful_at_begin()
    {
    return false;
    }
  }

File Information:

file name:PopHandler.java
package:org.dgpf.gp.vm.instructions.ctrl
qualified name:org.dgpf.gp.vm.instructions.ctrl.PopHandler.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/dgpf/gp/vm/instructions/ctrl/PopHandler.java
size:3.060 KB (3134 B)
uploaded: 2015-07-22 04:10:58 GMT+0000
last update: 2006-07-19 07:19:21 GMT+0000
last access: 2017-11-18 21:32:19 GMT+0000

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