Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/util/BlockWorkList.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 | d3fc4fe063bf |
rev | line source |
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1 /* |
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2 * Copyright (c) 2009, 2009, 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.c1x.ir.*; |
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26 |
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27 /** |
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28 * This class implements a worklist for dealing with blocks. The worklist can |
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29 * operate either as a stack (i.e. first-in / last-out), or as a sorted list, |
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30 * where blocks can be sorted by a supplied number. The latter usage lends itself |
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31 * naturally to iterative dataflow analysis problems. |
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32 * |
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33 * This implementation is not able to tell if a block is in the worklist already. |
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34 * Note that this implementation is slightly less efficient than the dedicated |
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35 * work list in {@link com.sun.c1x.graph.ScopeData}, because this worklist uses |
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36 * an externally supplied number. |
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37 * |
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38 * @author Ben L. Titzer |
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39 */ |
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40 public class BlockWorkList { |
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41 BlockBegin[] workList; |
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42 int[] workListNumbers; |
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43 int workListIndex; |
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44 |
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45 /** |
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46 * Adds a block to this list in an unsorted fashion, like a stack. |
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47 * @param block the block to add |
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48 */ |
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49 public void add(BlockBegin block) { |
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50 if (workList == null) { |
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51 // worklist not allocated yet |
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52 allocate(); |
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53 } else if (workListIndex == workList.length) { |
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54 // need to grow the worklist |
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55 grow(); |
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56 } |
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57 // put the block at the end of the array |
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58 workList[workListIndex++] = block; |
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59 } |
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60 |
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61 /** |
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62 * Adds a block to this list, sorted by the supplied number. The block |
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63 * with the lowest number is returned upon subsequent removes. |
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64 * @param block the block to add |
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65 * @param number the number used to sort the block |
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66 */ |
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67 public void addSorted(BlockBegin block, int number) { |
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68 if (workList == null) { |
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69 // worklist not allocated yet |
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70 allocate(); |
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71 } else if (workListIndex == workList.length) { |
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72 // need to grow the worklist |
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73 grow(); |
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74 } |
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75 // put the block at the end of the array |
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76 workList[workListIndex] = block; |
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77 workListNumbers[workListIndex] = number; |
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78 workListIndex++; |
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79 int i = workListIndex - 2; |
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80 // push block towards the beginning of the array |
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81 for (; i >= 0; i--) { |
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82 int n = workListNumbers[i]; |
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83 if (n >= number) { |
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84 break; // already in the right position |
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85 } |
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86 workList[i + 1] = workList[i]; // bubble b down by one |
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87 workList[i] = block; // and overwrite its place with block |
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88 workListNumbers[i + 1] = n; // bubble n down by one |
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89 workListNumbers[i] = number; // and overwrite its place with number |
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90 } |
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91 } |
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92 |
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93 /** |
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94 * Removes the next block from this work list. If the blocks have been added |
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95 * in a sorted order, then the block with the lowest number is returned. Otherwise, |
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96 * the last block added is returned. |
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97 * @return the next block in the list |
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98 */ |
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99 public BlockBegin removeFromWorkList() { |
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100 if (workListIndex != 0) { |
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101 return workList[--workListIndex]; |
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102 } |
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103 return null; |
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104 } |
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105 |
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106 /** |
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107 * Checks whether the list is empty. |
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108 * @return {@code true} if this list is empty |
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109 */ |
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110 public boolean isEmpty() { |
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111 return workListIndex == 0; |
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112 } |
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113 |
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114 private void allocate() { |
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115 workList = new BlockBegin[5]; |
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116 workListNumbers = new int[5]; |
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117 } |
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118 |
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119 private void grow() { |
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120 int prevLength = workList.length; |
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121 BlockBegin[] nworkList = new BlockBegin[prevLength * 3]; |
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122 System.arraycopy(workList, 0, nworkList, 0, prevLength); |
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123 workList = nworkList; |
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124 |
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125 int[] nworkListNumbers = new int[prevLength * 3]; |
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126 System.arraycopy(workListNumbers, 0, nworkListNumbers, 0, prevLength); |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
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127 workListNumbers = nworkListNumbers; |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
128 } |
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
changeset
|
129 } |