Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/alloc/Range.java @ 2697:bd4c3be86fb7
Backend clean up.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 18 May 2011 15:14:55 +0200 |
parents | 16b9a8b5ad39 |
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rev | line source |
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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.alloc; |
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24 |
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25 |
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26 /** |
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27 * Represents a range of integers from a start (inclusive) to an end (exclusive. |
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28 * |
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29 * @author Thomas Wuerthinger |
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30 */ |
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31 public final class Range { |
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32 |
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33 public static final Range EndMarker = new Range(Integer.MAX_VALUE, Integer.MAX_VALUE, null); |
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34 |
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35 /** |
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36 * The start of the range, inclusive. |
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37 */ |
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38 public int from; |
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39 |
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40 /** |
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41 * The end of the range, exclusive. |
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42 */ |
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43 public int to; |
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44 |
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45 /** |
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46 * A link to allow the range to be put into a singly linked list. |
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47 */ |
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48 public Range next; |
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49 |
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50 boolean intersects(Range r) { |
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51 return intersectsAt(r) != -1; |
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52 } |
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53 |
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54 |
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55 /** |
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56 * Creates a new range. |
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57 * |
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58 * @param from the start of the range, inclusive |
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59 * @param to the end of the range, exclusive |
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60 * @param next link to the next range in a linked list |
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61 */ |
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62 Range(int from, int to, Range next) { |
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63 this.from = from; |
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64 this.to = to; |
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65 this.next = next; |
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66 } |
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67 |
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68 int intersectsAt(Range r2) { |
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69 Range r1 = this; |
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70 |
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71 assert r2 != null : "null ranges not allowed"; |
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72 assert r1 != EndMarker && r2 != EndMarker : "empty ranges not allowed"; |
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73 |
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74 do { |
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75 if (r1.from < r2.from) { |
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76 if (r1.to <= r2.from) { |
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77 r1 = r1.next; |
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78 if (r1 == EndMarker) { |
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79 return -1; |
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80 } |
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81 } else { |
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82 return r2.from; |
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83 } |
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84 } else { |
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85 if (r2.from < r1.from) { |
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86 if (r2.to <= r1.from) { |
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87 r2 = r2.next; |
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88 if (r2 == EndMarker) { |
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89 return -1; |
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90 } |
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91 } else { |
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92 return r1.from; |
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93 } |
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94 } else { // r1.from() == r2.from() |
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95 if (r1.from == r1.to) { |
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96 r1 = r1.next; |
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97 if (r1 == EndMarker) { |
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98 return -1; |
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99 } |
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100 } else { |
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101 if (r2.from == r2.to) { |
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102 r2 = r2.next; |
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103 if (r2 == EndMarker) { |
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104 return -1; |
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105 } |
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106 } else { |
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107 return r1.from; |
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108 } |
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109 } |
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110 } |
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111 } |
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112 } while (true); |
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113 } |
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114 |
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115 @Override |
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116 public String toString() { |
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117 return "[" + from + ", " + to + "]"; |
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118 } |
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119 } |