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annotate graal/com.oracle.max.graal.compiler/src/com/sun/c1x/util/ArrayMap.java @ 2872:0341b6424579

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Project renaming.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 08 Jun 2011 08:42:25 +0200
parents graal/GraalCompiler/src/com/sun/c1x/util/ArrayMap.java@16b9a8b5ad39
children
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1 /*
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2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.c1x.util;
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24
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25 /**
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26 * The {@code ArrayMap} class implements an efficient one-level map which is implemented
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27 * as an array. Note that because of the one-level array inside, this data structure performs best
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28 * when the range of integer keys is small and densely used. Note that the implementation can
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29 * handle arbitrary intervals, including negative numbers, up to intervals of size 2^31 - 1.
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30 *
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31 * @author Ben L. Titzer
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32 */
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33 public class ArrayMap<T> {
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34
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35 private static final int INITIAL_SIZE = 5; // how big the initial array should be
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36 private static final int EXTRA = 2; // how far on the left or right of a new element to grow
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37
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38 Object[] map;
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39 int low;
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40
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41 /**
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42 * Constructs a new {@code ArrayMap} with no initial assumptions.
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43 */
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44 public ArrayMap() {
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45 }
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46
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47 /**
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48 * Constructs a new {@code ArrayMap} that initially covers the specified interval.
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49 * Note that this map will automatically expand if necessary later.
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50 * @param low the low index, inclusive
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51 * @param high the high index, exclusive
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52 */
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53 public ArrayMap(int low, int high) {
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54 this.low = low;
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55 this.map = new Object[high - low + 1];
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56 }
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57
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58 /**
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59 * Puts a new value in the map at the specified index.
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60 * @param i the index at which to store the value
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61 * @param value the value to store at the specified index
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62 */
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63 public void put(int i, T value) {
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64 int index = i - low;
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65 if (map == null) {
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66 // no map yet
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67 map = new Object[INITIAL_SIZE];
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68 low = index - 2;
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69 map[INITIAL_SIZE / 2] = value;
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70 } else if (index < 0) {
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71 // grow backwards
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72 growBackward(i, value);
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73 } else if (index >= map.length) {
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74 // grow forwards
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75 growForward(i, value);
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76 } else {
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77 // no growth necessary
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78 map[index] = value;
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79 }
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80 }
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81
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82 /**
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83 * Gets the value at the specified index in the map.
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84 * @param i the index
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85 * @return the value at the specified index; {@code null} if there is no value at the specified index,
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86 * or if the index is out of the currently stored range
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87 */
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88 public T get(int i) {
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89 int index = i - low;
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90 if (map == null || index < 0 || index >= map.length) {
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91 return null;
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92 }
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93 Class<T> type = null;
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94 return Util.uncheckedCast(type, map[index]);
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95 }
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96
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97 public int length() {
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98 return map.length;
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99 }
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100
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101 private void growBackward(int i, T value) {
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102 int nlow = i - EXTRA;
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103 Object[] nmap = new Object[low - nlow + map.length];
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104 System.arraycopy(map, 0, nmap, low - nlow, map.length);
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105 map = nmap;
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106 low = nlow;
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107 map[i - low] = value;
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108 }
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109
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110 private void growForward(int i, T value) {
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111 int nlen = i - low + 1 + EXTRA;
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112 Object[] nmap = new Object[nlen];
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113 System.arraycopy(map, 0, nmap, 0, map.length);
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114 map = nmap;
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115 map[i - low] = value;
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116 }
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117 }