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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/util/BitMap2D.java @ 2874:d90bf514d647

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Renamed packages.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 08 Jun 2011 08:59:54 +0200
parents graal/com.oracle.max.graal.compiler/src/com/sun/c1x/util/BitMap2D.java@0341b6424579
children 6535766b47f4
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1 /*
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2 * Copyright (c) 2009, 2011, 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.oracle.max.graal.compiler.util;
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24
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25 import com.sun.cri.ci.*;
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26
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27 /**
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28 * This class implements a two-dimensional bitmap.
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29 *
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30 * @author Marcelo Cintra
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31 * @author Thomas Wuerthinger
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32 */
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33 public final class BitMap2D {
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34
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35 private CiBitMap map;
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36 private final int bitsPerSlot;
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37
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38 private int bitIndex(int slotIndex, int bitWithinSlotIndex) {
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39 return slotIndex * bitsPerSlot + bitWithinSlotIndex;
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40 }
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41
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42 private boolean verifyBitWithinSlotIndex(int index) {
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43 assert index < bitsPerSlot : "index " + index + " is out of bounds " + bitsPerSlot;
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44 return true;
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45 }
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46
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47 public BitMap2D(int sizeInSlots, int bitsPerSlot) {
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48 map = new CiBitMap(sizeInSlots * bitsPerSlot);
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49 this.bitsPerSlot = bitsPerSlot;
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50 }
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51
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52 public int sizeInBits() {
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53 return map.size();
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54 }
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55
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56 // Returns number of full slots that have been allocated
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57 public int sizeInSlots() {
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58 return map.size() / bitsPerSlot;
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59 }
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60
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61 public boolean isValidIndex(int slotIndex, int bitWithinSlotIndex) {
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62 assert verifyBitWithinSlotIndex(bitWithinSlotIndex);
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63 return (bitIndex(slotIndex, bitWithinSlotIndex) < sizeInBits());
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64 }
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65
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66 public boolean at(int slotIndex, int bitWithinSlotIndex) {
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67 assert verifyBitWithinSlotIndex(bitWithinSlotIndex);
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68 return map.get(bitIndex(slotIndex, bitWithinSlotIndex));
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69 }
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70
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71 public void setBit(int slotIndex, int bitWithinSlotIndex) {
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72 assert verifyBitWithinSlotIndex(bitWithinSlotIndex);
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73 map.set(bitIndex(slotIndex, bitWithinSlotIndex));
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74 }
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75
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76 public void clearBit(int slotIndex, int bitWithinSlotIndex) {
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77 assert verifyBitWithinSlotIndex(bitWithinSlotIndex);
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78 map.clear(bitIndex(slotIndex, bitWithinSlotIndex));
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79 }
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80
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81 public void atPutGrow(int slotIndex, int bitWithinSlotIndex, boolean value) {
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82 int size = sizeInSlots();
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83 if (size <= slotIndex) {
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84 while (size <= slotIndex) {
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85 size *= 2;
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86 }
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87 CiBitMap newBitMap = new CiBitMap(size * bitsPerSlot);
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88 newBitMap.setUnion(map);
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89 map = newBitMap;
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90 }
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91
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92 if (value) {
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93 setBit(slotIndex, bitWithinSlotIndex);
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94 } else {
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95 clearBit(slotIndex, bitWithinSlotIndex);
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96 }
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97 }
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98
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99 public void clear() {
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100 map.clearAll();
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101 }
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102 }