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annotate graal/Compiler/src/com/sun/c1x/opt/ValueMap.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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.opt; |
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24 |
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25 import com.sun.c1x.*; |
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26 import com.sun.c1x.ir.*; |
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27 |
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28 /** |
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29 * The {@code ValueMap} class implements a nested hashtable data structure |
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30 * for use in local and global value numbering. |
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31 * |
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32 * @author Ben L. Titzer |
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33 */ |
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34 public class ValueMap { |
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35 /** |
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36 * The class that forms hash chains. |
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37 */ |
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38 private static class Link { |
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39 final ValueMap map; |
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40 final int valueNumber; |
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41 final Instruction value; |
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42 final Link next; |
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43 |
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44 Link(ValueMap map, int valueNumber, Instruction value, Link next) { |
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45 this.map = map; |
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46 this.valueNumber = valueNumber; |
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47 this.value = value; |
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48 this.next = next; |
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49 } |
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50 } |
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51 |
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52 private final ValueMap parent; |
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53 |
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54 /** |
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55 * The table of links, indexed by hashing using the {@link Instruction#valueNumber() method}. |
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56 * The hash chains themselves may share parts of the parents' hash chains at the end. |
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57 */ |
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58 private Link[] table; |
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59 |
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60 /** |
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61 * Total number of entries in this map and the parent, used to compute unique ids. |
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62 */ |
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63 private int count; |
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64 |
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65 /** |
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66 * The maximum size allowed before triggering resizing. |
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67 */ |
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68 private int max; |
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69 |
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70 /** |
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71 * Creates a new value map. |
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72 */ |
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73 public ValueMap() { |
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74 parent = null; |
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75 table = new Link[19]; |
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76 } |
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77 |
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78 /** |
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79 * Creates a new value map with the specified parent value map. |
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80 * @param parent the parent value map |
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81 */ |
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82 public ValueMap(ValueMap parent) { |
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83 this.parent = parent; |
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84 this.table = parent.table.clone(); |
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85 this.count = parent.count; |
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86 this.max = table.length + table.length / 2; |
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87 } |
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88 |
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89 /** |
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90 * Inserts a value into the value map and looks up any previously available value. |
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91 * @param x the instruction to insert into the value map |
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92 * @return the value with which to replace the specified instruction, or the specified |
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93 * instruction if there is no replacement |
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94 */ |
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95 public Instruction findInsert(Instruction x) { |
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96 int valueNumber = x.valueNumber(); |
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97 if (valueNumber != 0) { |
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98 // value number != 0 means the instruction can be value numbered |
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99 int index = indexOf(valueNumber, table); |
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100 Link l = table[index]; |
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101 // hash and linear search |
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102 while (l != null) { |
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103 if (l.valueNumber == valueNumber && l.value.valueEqual(x)) { |
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104 return l.value; |
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105 } |
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106 l = l.next; |
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107 } |
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108 // not found; insert |
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109 table[index] = new Link(this, valueNumber, x, table[index]); |
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110 if (count > max) { |
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111 resize(); |
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112 } |
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113 } |
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114 return x; |
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115 } |
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116 |
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117 /** |
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118 * Kills all values in this local value map. |
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119 */ |
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120 public void killAll() { |
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121 assert parent == null : "should only be used for local value numbering"; |
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122 for (int i = 0; i < table.length; i++) { |
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123 table[i] = null; |
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124 } |
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125 count = 0; |
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126 } |
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127 |
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128 private void resize() { |
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129 C1XMetrics.ValueMapResizes++; |
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130 Link[] ntable = new Link[table.length * 3 + 4]; |
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131 if (parent != null) { |
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132 // first add all the parent's entries by cloning them |
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133 for (int i = 0; i < table.length; i++) { |
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134 Link l = table[i]; |
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135 while (l != null && l.map == this) { |
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136 l = l.next; // skip entries in this map |
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137 } |
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138 while (l != null) { |
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139 // copy entries from parent |
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140 int index = indexOf(l.valueNumber, ntable); |
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141 ntable[index] = new Link(l.map, l.valueNumber, l.value, ntable[index]); |
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142 l = l.next; |
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143 } |
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144 } |
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145 } |
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146 |
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147 for (int i = 0; i < table.length; i++) { |
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148 Link l = table[i]; |
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149 // now add all the entries from this map |
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150 while (l != null && l.map == this) { |
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151 int index = indexOf(l.valueNumber, ntable); |
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152 ntable[index] = new Link(l.map, l.valueNumber, l.value, ntable[index]); |
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153 l = l.next; |
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154 } |
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155 } |
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156 table = ntable; |
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157 max = table.length + table.length / 2; |
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158 } |
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159 |
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160 private int indexOf(int valueNumber, Link[] t) { |
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161 return (valueNumber & 0x7fffffff) % t.length; |
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162 } |
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163 } |