Mercurial > hg > graal-compiler

annotate graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/LoopBeginNode.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
parents
children bc8527f3071c
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3733
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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.max.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.max.graal.graph.*;
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28 import com.oracle.max.graal.nodes.loop.*;
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29 import com.oracle.max.graal.nodes.spi.*;
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30 import com.sun.cri.ci.*;
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31
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32
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33 public class LoopBeginNode extends MergeNode implements Node.IterableNodeType, LIRLowerable {
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34
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35 private double loopFrequency;
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36
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37 public LoopBeginNode() {
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38 loopFrequency = 1;
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39 }
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40
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41 public double loopFrequency() {
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42 return loopFrequency;
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43 }
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44
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45 public void setLoopFrequency(double loopFrequency) {
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46 this.loopFrequency = loopFrequency;
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47 }
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48
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49 public LoopEndNode loopEnd() {
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50 for (LoopEndNode end : usages().filter(LoopEndNode.class)) {
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51 if (end.loopBegin() == this) {
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52 return end;
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53 }
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54 }
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55 return null;
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56 }
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57
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58 @Override
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59 public void generate(LIRGeneratorTool gen) {
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60 // Nothing to emit, since this is node is used for structural purposes only.
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61 }
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62
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63 @Override
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64 public int phiPredecessorCount() {
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65 return endCount() + 1;
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66 }
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67
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68 @Override
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69 public int phiPredecessorIndex(FixedNode pred) {
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70 if (pred == forwardEdge()) {
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71 return 0;
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72 } else if (pred == this.loopEnd()) {
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73 return 1;
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74 }
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75 throw ValueUtil.shouldNotReachHere("unknown pred : " + pred + "(sp=" + forwardEdge() + ", le=" + this.loopEnd() + ")");
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76 }
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77
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78 @Override
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79 public FixedNode phiPredecessorAt(int index) {
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80 if (index == 0) {
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81 return forwardEdge();
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82 } else if (index == 1) {
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83 return loopEnd();
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84 }
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85 throw ValueUtil.shouldNotReachHere();
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86 }
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87
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88 public Collection<InductionVariableNode> inductionVariables() {
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89 // TODO (gd) produces useless garbage
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90 List<InductionVariableNode> list = new LinkedList<InductionVariableNode>();
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91 collectInductionVariables(this, list);
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92 return list;
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93 }
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94
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95 private static void collectInductionVariables(Node node, Collection<InductionVariableNode> collection) {
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96 for (InductionVariableNode iv : node.usages().filter(InductionVariableNode.class)) {
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97 collection.add(iv);
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98 collectInductionVariables(iv, collection);
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99 }
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100 }
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101
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102 @Override
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103 public Iterable<? extends Node> phiPredecessors() {
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104 return Arrays.asList(new Node[]{this.forwardEdge(), this.loopEnd()});
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105 }
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106
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107 public EndNode forwardEdge() {
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108 return this.endAt(0);
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109 }
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110
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111 public LoopCounterNode loopCounter() {
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112 return loopCounter(CiKind.Long);
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113 }
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114
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115 public LoopCounterNode loopCounter(CiKind kind) {
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116 for (LoopCounterNode counter : usages().filter(LoopCounterNode.class)) {
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117 if (counter.kind() == kind) {
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118 return counter;
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119 }
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120 }
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121 return graph().add(new LoopCounterNode(kind, this));
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122 }
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123
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124 @Override
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125 public boolean verify() {
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126 assertTrue(loopEnd() != null, "missing loopEnd");
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127 assertTrue(forwardEdge() != null, "missing forwardEdge");
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128 assertTrue(usages().filter(LoopEndNode.class).snapshot().size() == 1, "multiple loop ends");
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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 }