Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/alloc/IntervalWalker.java @ 2642:8932f1027050
Removed local value map.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:15:14 +0200 |
parents | 16b9a8b5ad39 |
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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.alloc; |
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24 |
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25 import com.sun.c1x.*; |
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26 import com.sun.c1x.alloc.Interval.*; |
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27 import com.sun.c1x.debug.*; |
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28 |
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29 /** |
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30 * |
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31 * @author Thomas Wuerthinger |
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32 */ |
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33 public class IntervalWalker { |
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34 |
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35 protected final C1XCompilation compilation; |
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36 protected final LinearScan allocator; |
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37 |
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38 /** |
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39 * Sorted list of intervals, not live before the current position. |
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40 */ |
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41 RegisterBindingLists unhandledLists; |
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42 |
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43 /** |
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44 * Sorted list of intervals, live at the current position. |
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45 */ |
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46 RegisterBindingLists activeLists; |
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47 |
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48 /** |
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49 * Sorted list of intervals in a life time hole at the current position. |
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50 */ |
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51 RegisterBindingLists inactiveLists; |
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52 |
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53 /** |
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54 * The current interval (taken from the unhandled list) being processed. |
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55 */ |
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56 protected Interval current; |
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57 |
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58 /** |
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59 * The current position (intercept point through the intervals). |
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60 */ |
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61 protected int currentPosition; |
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62 |
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63 /** |
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64 * The binding of the current interval being processed. |
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65 */ |
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66 protected RegisterBinding currentBinding; |
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67 |
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68 /** |
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69 * Processes the {@linkplain #current} interval in an attempt to allocate a physical |
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70 * register to it and thus allow it to be moved to a list of {@linkplain #activeLists active} intervals. |
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71 * |
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72 * @return {@code true} if a register was allocated to the {@linkplain #current} interval |
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73 */ |
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74 boolean activateCurrent() { |
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75 return true; |
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76 } |
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77 |
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78 void walkBefore(int lirOpId) { |
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79 walkTo(lirOpId - 1); |
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80 } |
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81 |
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82 void walk() { |
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83 walkTo(Integer.MAX_VALUE); |
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84 } |
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85 |
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86 /** |
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87 * Creates a new interval walker. |
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88 * |
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89 * @param allocator the register allocator context |
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90 * @param unhandledFixed the list of unhandled {@linkplain RegisterBinding#Fixed fixed} intervals |
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91 * @param unhandledAny the list of unhandled {@linkplain RegisterBinding#Any non-fixed} intervals |
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92 */ |
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93 IntervalWalker(LinearScan allocator, Interval unhandledFixed, Interval unhandledAny) { |
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94 this.compilation = allocator.compilation; |
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95 this.allocator = allocator; |
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96 |
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97 unhandledLists = new RegisterBindingLists(unhandledFixed, unhandledAny); |
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98 activeLists = new RegisterBindingLists(Interval.EndMarker, Interval.EndMarker); |
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99 inactiveLists = new RegisterBindingLists(Interval.EndMarker, Interval.EndMarker); |
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100 currentPosition = -1; |
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101 current = null; |
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102 nextInterval(); |
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103 } |
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104 |
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105 void removeFromList(Interval interval) { |
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106 if (interval.state == State.Active) { |
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107 activeLists.remove(RegisterBinding.Any, interval); |
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108 } else { |
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109 assert interval.state == State.Inactive : "invalid state"; |
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110 inactiveLists.remove(RegisterBinding.Any, interval); |
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111 } |
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112 } |
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113 |
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114 void walkTo(State state, int from) { |
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115 assert state == State.Active || state == State.Inactive : "wrong state"; |
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116 for (RegisterBinding binding : RegisterBinding.VALUES) { |
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117 Interval prevprev = null; |
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118 Interval prev = (state == State.Active) ? activeLists.get(binding) : inactiveLists.get(binding); |
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119 Interval next = prev; |
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120 while (next.currentFrom() <= from) { |
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121 Interval cur = next; |
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122 next = cur.next; |
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123 |
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124 boolean rangeHasChanged = false; |
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125 while (cur.currentTo() <= from) { |
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126 cur.nextRange(); |
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127 rangeHasChanged = true; |
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128 } |
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129 |
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130 // also handle move from inactive list to active list |
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131 rangeHasChanged = rangeHasChanged || (state == State.Inactive && cur.currentFrom() <= from); |
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132 |
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133 if (rangeHasChanged) { |
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134 // remove cur from list |
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135 if (prevprev == null) { |
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136 if (state == State.Active) { |
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137 activeLists.set(binding, next); |
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138 } else { |
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139 inactiveLists.set(binding, next); |
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140 } |
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141 } else { |
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142 prevprev.next = next; |
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143 } |
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144 prev = next; |
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145 if (cur.currentAtEnd()) { |
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146 // move to handled state (not maintained as a list) |
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147 cur.state = State.Handled; |
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148 intervalMoved(cur, binding, state, State.Handled); |
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149 } else if (cur.currentFrom() <= from) { |
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150 // sort into active list |
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151 activeLists.addToListSortedByCurrentFromPositions(binding, cur); |
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152 cur.state = State.Active; |
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153 if (prev == cur) { |
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154 assert state == State.Active : "check"; |
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155 prevprev = prev; |
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156 prev = cur.next; |
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157 } |
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158 intervalMoved(cur, binding, state, State.Active); |
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159 } else { |
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160 // sort into inactive list |
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161 inactiveLists.addToListSortedByCurrentFromPositions(binding, cur); |
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162 cur.state = State.Inactive; |
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163 if (prev == cur) { |
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164 assert state == State.Inactive : "check"; |
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165 prevprev = prev; |
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166 prev = cur.next; |
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167 } |
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168 intervalMoved(cur, binding, state, State.Inactive); |
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169 } |
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170 } else { |
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171 prevprev = prev; |
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172 prev = cur.next; |
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173 } |
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174 } |
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175 } |
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176 } |
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177 |
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178 void nextInterval() { |
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179 RegisterBinding binding; |
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180 Interval any = unhandledLists.any; |
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181 Interval fixed = unhandledLists.fixed; |
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182 |
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183 if (any != Interval.EndMarker) { |
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184 // intervals may start at same position . prefer fixed interval |
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185 binding = fixed != Interval.EndMarker && fixed.from() <= any.from() ? RegisterBinding.Fixed : RegisterBinding.Any; |
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186 |
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187 assert binding == RegisterBinding.Fixed && fixed.from() <= any.from() || binding == RegisterBinding.Any && any.from() <= fixed.from() : "wrong interval!!!"; |
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188 assert any == Interval.EndMarker || fixed == Interval.EndMarker || any.from() != fixed.from() || binding == RegisterBinding.Fixed : "if fixed and any-Interval start at same position, fixed must be processed first"; |
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189 |
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190 } else if (fixed != Interval.EndMarker) { |
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191 binding = RegisterBinding.Fixed; |
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192 } else { |
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193 current = null; |
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194 return; |
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195 } |
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196 currentBinding = binding; |
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197 current = unhandledLists.get(binding); |
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198 unhandledLists.set(binding, current.next); |
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199 current.next = Interval.EndMarker; |
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200 current.rewindRange(); |
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201 } |
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202 |
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203 void walkTo(int toOpId) { |
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204 assert currentPosition <= toOpId : "can not walk backwards"; |
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205 while (current != null) { |
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206 boolean isActive = current.from() <= toOpId; |
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207 int opId = isActive ? current.from() : toOpId; |
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208 |
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209 if (C1XOptions.TraceLinearScanLevel >= 2 && !TTY.isSuppressed()) { |
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210 if (currentPosition < opId) { |
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211 TTY.println(); |
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212 TTY.println("walkTo(%d) *", opId); |
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213 } |
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214 } |
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215 |
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216 // set currentPosition prior to call of walkTo |
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217 currentPosition = opId; |
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218 |
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219 // call walkTo even if currentPosition == id |
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220 walkTo(State.Active, opId); |
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221 walkTo(State.Inactive, opId); |
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222 |
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223 if (isActive) { |
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224 current.state = State.Active; |
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225 if (activateCurrent()) { |
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226 activeLists.addToListSortedByCurrentFromPositions(currentBinding, current); |
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227 intervalMoved(current, currentBinding, State.Unhandled, State.Active); |
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228 } |
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229 |
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230 nextInterval(); |
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231 } else { |
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232 return; |
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233 } |
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234 } |
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235 } |
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236 |
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237 private void intervalMoved(Interval interval, RegisterBinding kind, State from, State to) { |
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238 // intervalMoved() is called whenever an interval moves from one interval list to another. |
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239 // In the implementation of this method it is prohibited to move the interval to any list. |
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240 if (C1XOptions.TraceLinearScanLevel >= 4 && !TTY.isSuppressed()) { |
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241 TTY.print(from.toString() + " to " + to.toString()); |
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242 TTY.fillTo(23); |
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243 TTY.out().println(interval.logString(allocator)); |
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244 } |
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245 } |
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246 } |