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annotate graal/GraalCompiler/src/com/sun/c1x/alloc/Range.java @ 2674:6ab73784566a

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* BlockBegin.predecessors changed to List<BlockEnd> * Node: add input/successor with given back edge index, allows for explicit ordering of predecessors/usages * Graphviz: PDF output, option to omit FrameStates * runscimark.sh: forward additional options to JVM
author Lukas Stadler <lukas.stadler@jku.at>
date Fri, 13 May 2011 15:18:41 +0200
parents 16b9a8b5ad39
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2507
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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 }