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annotate graal/GraalCompiler/src/com/sun/c1x/alloc/IntervalWalker.java @ 2718:c1ce2a53d6c3

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Attempt to remove dependency between backend and BlockBegin.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Thu, 19 May 2011 16:05:42 +0200
parents 16b9a8b5ad39
children
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2507
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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 }