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 */
013package org.jikesrvm.compilers.opt.ir.operand;
014
015import org.jikesrvm.VM;
016import org.jikesrvm.classloader.RVMMethod;
017import org.jikesrvm.classloader.TypeReference;
018
019/**
020 * Represents a constant code operand, found for example, from an
021 * TIBConstantOperand.<p>
022 *
023 * NB we don't use an object constant operand
024 * because
025 * <ol>
026 *   <li>code doesn't form part of the object literals
027 *   <li>we need to support replacement
028 * </ol>
029 *
030 * @see Operand
031 */
032public final class CodeConstantOperand extends ConstantOperand {
033
034  /**
035   * The non-{@code null} method for the code represent
036   */
037  public final RVMMethod value;
038
039  /**
040   * Construct a new code constant operand
041   *
042   * @param v the method of this TIB
043   */
044  public CodeConstantOperand(RVMMethod v) {
045    if (VM.VerifyAssertions) VM._assert(v != null);
046    value = v;
047  }
048
049  @Override
050  public Operand copy() {
051    return new CodeConstantOperand(value);
052  }
053
054  /**
055   * @return {@link TypeReference#CodeArray}
056   */
057  @Override
058  public TypeReference getType() {
059    return TypeReference.CodeArray;
060  }
061
062  /**
063   * @return <code>true</code>
064   */
065  @Override
066  public boolean isRef() {
067    return true;
068  }
069
070  @Override
071  public boolean similar(Operand op) {
072    return (op instanceof CodeConstantOperand) && value == ((CodeConstantOperand) op).value;
073  }
074
075  /**
076   * Returns the string representation of this operand.
077   *
078   * @return a string representation of this operand.
079   */
080  @Override
081  public String toString() {
082    return "code \"" + value + "\"";
083  }
084}