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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/LoopBeginNode.java @ 5060:4ed4295ce15f

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Update import statements.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 08 Mar 2012 19:11:12 +0100
parents ed559a528128
children
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1 /*
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2 * Copyright (c) 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.oracle.graal.nodes;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.graph.*;
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28 import com.oracle.graal.graph.iterators.*;
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29 import com.oracle.graal.nodes.spi.*;
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32 public class LoopBeginNode extends MergeNode implements Node.IterableNodeType, LIRLowerable {
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33 private double loopFrequency;
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34 private int nextEndIndex;
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35
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36 public LoopBeginNode() {
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37 loopFrequency = 1;
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38 }
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39
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40 public double loopFrequency() {
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41 return loopFrequency;
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42 }
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43
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44 public void setLoopFrequency(double loopFrequency) {
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45 this.loopFrequency = loopFrequency;
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46 }
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47
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48 public NodeIterable<LoopEndNode> loopEnds() {
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49 return usages().filter(LoopEndNode.class);
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50 }
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51
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52 public List<LoopEndNode> orderedLoopEnds() {
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53 List<LoopEndNode> snapshot = usages().filter(LoopEndNode.class).snapshot();
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54 Collections.sort(snapshot, new Comparator<LoopEndNode>() {
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55 @Override
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56 public int compare(LoopEndNode o1, LoopEndNode o2) {
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57 return o1.endIndex() - o2.endIndex();
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58 }
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59 });
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60 return snapshot;
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61 }
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62
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63 public EndNode forwardEnd() {
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64 assert forwardEndCount() == 1;
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65 return forwardEndAt(0);
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66 }
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67
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68 @Override
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69 public void generate(LIRGeneratorTool gen) {
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70 // Nothing to emit, since this is node is used for structural purposes only.
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71 }
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72
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73 @Override
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74 protected void deleteEnd(EndNode end) {
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75 if (end instanceof LoopEndNode) {
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76 LoopEndNode loopEnd = (LoopEndNode) end;
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77 loopEnd.setLoopBegin(null);
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78 int idx = loopEnd.endIndex();
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79 for (LoopEndNode le : loopEnds()) {
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80 int leIdx = le.endIndex();
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81 assert leIdx != idx;
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82 if (leIdx > idx) {
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83 le.setEndIndex(leIdx - 1);
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84 }
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85 }
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86 nextEndIndex--;
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87 } else {
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88 super.deleteEnd(end);
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89 }
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90 }
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91
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92 @Override
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93 public int phiPredecessorCount() {
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94 return forwardEndCount() + loopEnds().count();
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95 }
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96
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97 @Override
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98 public int phiPredecessorIndex(EndNode pred) {
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99 if (pred instanceof LoopEndNode) {
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100 LoopEndNode loopEnd = (LoopEndNode) pred;
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101 if (loopEnd.loopBegin() == this) {
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102 assert loopEnd.endIndex() < loopEnds().count() : "Invalid endIndex : " + loopEnd;
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103 return loopEnd.endIndex() + forwardEndCount();
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104 }
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105 } else {
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106 return super.forwardEndIndex(pred);
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107 }
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108 throw ValueUtil.shouldNotReachHere("unknown pred : " + pred);
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109 }
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110
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111 @Override
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112 public EndNode phiPredecessorAt(int index) {
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113 if (index < forwardEndCount()) {
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114 return forwardEndAt(index);
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115 }
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116 for (LoopEndNode end : loopEnds()) {
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117 int idx = index - forwardEndCount();
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118 assert idx >= 0;
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119 if (end.endIndex() == idx) {
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120 return end;
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121 }
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122 }
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123 throw ValueUtil.shouldNotReachHere();
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124 }
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125
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126 @Override
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127 public boolean verify() {
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128 assertTrue(loopEnds().isNotEmpty(), "missing loopEnd");
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129 return super.verify();
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130 }
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131
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132 @Override
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133 public Map<Object, Object> getDebugProperties() {
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134 Map<Object, Object> properties = super.getDebugProperties();
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135 properties.put("loopFrequency", String.format("%7.1f", loopFrequency));
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136 return properties;
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137 }
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138
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139 public int nextEndIndex() {
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140 return nextEndIndex++;
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141 }
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142
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143 @Override
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144 public void simplify(SimplifierTool tool) {
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145 // nothing yet
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146 }
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147 }