001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.jikesrvm.compilers.opt.ir.operand;
014    
015    import org.jikesrvm.SizeConstants;
016    import org.jikesrvm.classloader.TypeReference;
017    import org.jikesrvm.runtime.Entrypoints;
018    import org.vmmagic.unboxed.Offset;
019    
020    /**
021     * Represents a constant double operand.
022     *
023     * @see Operand
024     */
025    public final class DoubleConstantOperand extends ConstantOperand implements SizeConstants {
026    
027      /**
028       * Value of this operand.
029       */
030      public double value;
031    
032      /**
033       * Offset in JTOC where this double constant lives. (0 for constants
034       * obtained from constant folding)
035       */
036      public Offset offset;
037    
038      /**
039       * Constructs a new double constant operand with the specified value.
040       *
041       * @param v value
042       */
043      public DoubleConstantOperand(double v) {
044        value = v;
045        if (v == 0.) {
046          offset = Entrypoints.zeroDoubleField.getOffset();
047        } else if (v == 1.) {
048          offset = Entrypoints.oneDoubleField.getOffset();
049        } else {
050          offset = Offset.zero();
051        }
052      }
053    
054      /**
055       * Constructs a new double constant operand with the specified value and JTOC offset.
056       *
057       * @param v value
058       * @param i offset in the jtoc
059       */
060      public DoubleConstantOperand(double v, Offset i) {
061        value = v;
062        offset = i;
063      }
064    
065      @Override
066      public Operand copy() {
067        return new DoubleConstantOperand(value, offset);
068      }
069    
070      /**
071       * @return {@link TypeReference#Double}
072       */
073      @Override
074      public TypeReference getType() {
075        return TypeReference.Double;
076      }
077    
078      /**
079       * @return <code>true</code>
080       */
081      @Override
082      public boolean isDouble() {
083        return true;
084      }
085    
086      @Override
087      public boolean similar(Operand op) {
088        return (op instanceof DoubleConstantOperand) && (value == ((DoubleConstantOperand) op).value);
089      }
090    
091      /**
092       * Returns the string representation of this operand.
093       *
094       * @return a string representation of this operand.
095       */
096      @Override
097      public String toString() {
098        return Double.toString(value) + "D";
099      }
100    
101    }