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.objectmodel;
014
015import org.jikesrvm.VM;
016import org.vmmagic.Intrinsic;
017import org.vmmagic.pragma.NonMoving;
018import org.vmmagic.pragma.Uninterruptible;
019import org.vmmagic.pragma.UninterruptibleNoWarn;
020
021/**
022 * This class represents an instance of an array of interface tables.
023 */
024@NonMoving
025public final class ITableArray implements RuntimeTable<ITable> {
026
027  /**
028   * The backing data used during boot image writing.
029   */
030  private final ITable[] backingData;
031
032  private ITableArray(int size) {
033    this.backingData = new ITable[size];
034  }
035
036  /**
037   * Return the backing array (for boot image writing)
038   */
039  @Override
040  public ITable[] getBacking() {
041    if (VM.VerifyAssertions) VM._assert(!VM.runningVM);
042    return backingData;
043  }
044
045  /**
046   * Create a new array of {@link ITable} of the specified size.
047   *
048   * @param size The size of the array
049   * @return The created ITableArray instance
050   */
051  public static ITableArray allocate(int size) {
052    if (VM.VerifyAssertions && VM.runningVM) VM._assert(VM.NOT_REACHED);
053    return new ITableArray(size);
054  }
055
056  /**
057   * Get an {@link ITable} entry from the array.
058   *
059   * @param index The index of the entry to get
060   * @return The value of that entry
061   */
062  @Override
063  @Intrinsic
064  @Uninterruptible
065  public ITable get(int index) {
066    if (VM.VerifyAssertions && VM.runningVM) VM._assert(VM.NOT_REACHED);
067    return backingData[index];
068  }
069
070  /**
071   * Set an {@link ITable} entry in the array.
072   *
073   * @param index The index of the entry to set
074   * @param value The value to set the entry to.
075   */
076  @Override
077  @Intrinsic
078  @UninterruptibleNoWarn("Interruptible code not reachable at runtime")
079  public void set(int index, ITable value) {
080    if (VM.VerifyAssertions && VM.runningVM) VM._assert(VM.NOT_REACHED);
081    backingData[index] = value;
082  }
083
084  /**
085   * Return the length of the array of {@link ITable}
086   */
087  @Override
088  @Intrinsic
089  @Uninterruptible
090  public int length() {
091    if (VM.VerifyAssertions && VM.runningVM) VM._assert(VM.NOT_REACHED);
092    return backingData.length;
093  }
094}