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annotate graal/GraalCompiler/src/com/sun/c1x/util/BitMap2D.java @ 2653:7c8ad40c1f88
No need for stateAfter on volatile field loads.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 15:11:33 +0200 |
parents | 16b9a8b5ad39 |
children | 2ac7b30b7290 |
rev | line source |
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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.sun.c1x.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 return index < bitsPerSlot; |
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44 } |
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45 |
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46 public BitMap2D(int sizeInSlots, int bitsPerSlot) { |
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47 map = new CiBitMap(sizeInSlots * bitsPerSlot); |
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48 this.bitsPerSlot = bitsPerSlot; |
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49 } |
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50 |
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51 public int sizeInBits() { |
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52 return map.size(); |
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53 } |
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54 |
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55 // Returns number of full slots that have been allocated |
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56 public int sizeInSlots() { |
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57 return map.size() / bitsPerSlot; |
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58 } |
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59 |
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60 public boolean isValidIndex(int slotIndex, int bitWithinSlotIndex) { |
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61 assert verifyBitWithinSlotIndex(bitWithinSlotIndex); |
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62 return (bitIndex(slotIndex, bitWithinSlotIndex) < sizeInBits()); |
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63 } |
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64 |
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65 public boolean at(int slotIndex, int bitWithinSlotIndex) { |
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66 assert verifyBitWithinSlotIndex(bitWithinSlotIndex); |
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67 return map.get(bitIndex(slotIndex, bitWithinSlotIndex)); |
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68 } |
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69 |
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70 public void setBit(int slotIndex, int bitWithinSlotIndex) { |
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71 assert verifyBitWithinSlotIndex(bitWithinSlotIndex); |
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72 map.set(bitIndex(slotIndex, bitWithinSlotIndex)); |
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73 } |
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74 |
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75 public void clearBit(int slotIndex, int bitWithinSlotIndex) { |
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76 assert verifyBitWithinSlotIndex(bitWithinSlotIndex); |
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77 map.clear(bitIndex(slotIndex, bitWithinSlotIndex)); |
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78 } |
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79 |
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80 public void atPutGrow(int slotIndex, int bitWithinSlotIndex, boolean value) { |
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81 int size = sizeInSlots(); |
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82 if (size <= slotIndex) { |
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83 while (size <= slotIndex) { |
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84 size *= 2; |
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85 } |
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86 CiBitMap newBitMap = new CiBitMap(size * bitsPerSlot); |
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87 newBitMap.setUnion(map); |
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88 map = newBitMap; |
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89 } |
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90 |
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91 if (value) { |
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92 setBit(slotIndex, bitWithinSlotIndex); |
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93 } else { |
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94 clearBit(slotIndex, bitWithinSlotIndex); |
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95 } |
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96 } |
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97 |
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98 public void clear() { |
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99 map.clearAll(); |
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100 } |
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101 } |