import java.io.PrintWriter;
import Instruction;

/**
 * The standard "Add" instruction for AAAL, the amazingly abstract
 * assembly language.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of April 2001
 */
public class Add
  implements Instruction
{
  // +--------+------------------------------------------------------------
  // | Fields |
  // +--------+

  /** The first value being added. */
  protected Location left;

  /** The second value being added. */
  protected Location right;

  /** The destination of the add command.  Where data goes to. */
  protected Location result;

  // +--------------+------------------------------------------------------
  // | Constructors |
  // +--------------+

  /**
   * Build a new add with specified arguments and result.
   */
  public Add(Location left, Location right, Location result) {
    this.left = left;
    this.right = right;
    this.result = result;
  } // Add(Location, Location, Location);

  // +---------------------+-----------------------------------------------
  // | Instruction Methods |
  // +---------------------+

  /**
   * Print the instruction.
   */
  public void print(PrintWriter out) {
    out.print("  ADD ");
    this.left.print(out);
    out.print(" + ");
    this.right.print(out);
    out.print(" -> ");
    this.result.print(out);
    out.println();
  } // print(PrintWriter)

} // class Add