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.classloader.TypeReference;
016    
017    /**
018     * This operand represents a "true" guard, e.g. non-nullness
019     * of the result of an allocation or
020     * boundcheck eliminated via analysis of the loop induction variables.
021     *
022     * @see Operand
023     */
024    public final class TrueGuardOperand extends ConstantOperand {
025    
026      /**
027       * @return TypeReference.VALIDATION_TYPE
028       */
029      @Override
030      public TypeReference getType() {
031        return TypeReference.VALIDATION_TYPE;
032      }
033    
034      @Override
035      public Operand copy() {
036        return new TrueGuardOperand();
037      }
038    
039      @Override
040      public boolean similar(Operand op) {
041        return op instanceof TrueGuardOperand;
042      }
043    
044      /**
045       * Returns the string representation of this operand.
046       *
047       * @return a string representation of this operand.
048       */
049      @Override
050      public String toString() {
051        return "<TRUEGUARD>";
052      }
053    }