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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/ir/Phi.java @ 2984:f49685081630

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Merge
author Gilles Duboscq <gilles.duboscq@oracle.com>
date Wed, 15 Jun 2011 19:54:42 +0200
parents fc66984c2f31 42681ed31c4d
children 2f5f6ffbafa0 0c519981c6cf
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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.oracle.max.graal.compiler.ir;
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24
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25 import com.oracle.max.graal.compiler.debug.*;
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26 import com.oracle.max.graal.graph.*;
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27 import com.sun.cri.ci.*;
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28
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29 /**
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30 * The {@code Phi} instruction represents the merging of dataflow
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31 * in the instruction graph. It refers to a join block and a variable.
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32 */
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33 public final class Phi extends FloatingNode {
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34
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35 private static final int DEFAULT_MAX_VALUES = 2;
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36
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37 private static final int INPUT_COUNT = 1;
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38 private static final int INPUT_MERGE = 0;
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39
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40 private static final int SUCCESSOR_COUNT = 0;
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41
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42 private boolean isDead;
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43
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44 @Override
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45 protected int inputCount() {
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46 return super.inputCount() + INPUT_COUNT;
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47 }
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48
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49 @Override
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50 protected int successorCount() {
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51 return super.successorCount() + SUCCESSOR_COUNT;
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52 }
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53
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54 /**
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55 * The merge node for this phi.
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56 */
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57 public Merge merge() {
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58 return (Merge) inputs().get(super.inputCount() + INPUT_MERGE);
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59 }
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60
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61 public void setMerge(Value n) {
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62 inputs().set(super.inputCount() + INPUT_MERGE, n);
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63 }
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64
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65 public Phi(CiKind kind, Merge merge, Graph graph) {
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66 super(kind, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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67 setMerge(merge);
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68 }
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69
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70 /**
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71 * Get the instruction that produces the value associated with the i'th predecessor
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72 * of the join block.
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73 * @param i the index of the predecessor
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74 * @return the instruction that produced the value in the i'th predecessor
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75 */
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76 public Value valueAt(int i) {
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77 return (Value) inputs().variablePart().get(i);
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78 }
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79
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80 public void setValueAt(int i, Value x) {
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81 inputs().set(INPUT_COUNT + i, x);
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82 }
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83
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84 /**
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85 * Get the number of inputs to this phi (i.e. the number of predecessors to the join block).
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86 * @return the number of inputs in this phi
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87 */
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88 public int valueCount() {
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89 return inputs().variablePart().size();
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90 }
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91
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92 @Override
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93 public void accept(ValueVisitor v) {
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94 v.visitPhi(this);
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95 }
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96
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97 /**
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98 * Make this phi illegal if types were not merged correctly.
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99 */
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100 public void makeDead() {
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101 isDead = true;
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102 }
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103
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104 public boolean isDead() {
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105 return isDead;
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106 }
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107
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108 @Override
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109 public void print(LogStream out) {
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110 out.print("phi function (");
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111 for (int i = 0; i < valueCount(); ++i) {
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112 if (i != 0) {
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113 out.print(' ');
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114 }
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115 out.print(valueAt(i));
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116 }
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117 out.print(')');
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118 }
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119
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120 @Override
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121 public String shortName() {
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122 StringBuilder str = new StringBuilder();
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123 for (int i = 0; i < valueCount(); ++i) {
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124 if (i != 0) {
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125 str.append(' ');
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126 }
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127 str.append(valueAt(i) == null ? "-" : valueAt(i).id());
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128 }
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129 return "Phi: (" + str + ")";
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130 }
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131
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132 public void addInput(Node y) {
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133 inputs().variablePart().add(y);
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134 }
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135
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136 public void removeInput(int index) {
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137 inputs().variablePart().remove(index);
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dd6419f4bfe2 Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2768
diff changeset
138 }
2827
bd17ac598c6e Graph cloning, initial version (not completely working)
Lukas Stadler <lukas.stadler@jku.at>
parents: 2821
diff changeset
139
bd17ac598c6e Graph cloning, initial version (not completely working)
Lukas Stadler <lukas.stadler@jku.at>
parents: 2821
diff changeset
140 @Override
bd17ac598c6e Graph cloning, initial version (not completely working)
Lukas Stadler <lukas.stadler@jku.at>
parents: 2821
diff changeset
141 public Node copy(Graph into) {
2961
0966a5a904ad Created variable part in NodeArray.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents: 2945
diff changeset
142 Phi x = new Phi(kind, null, into);
2827
bd17ac598c6e Graph cloning, initial version (not completely working)
Lukas Stadler <lukas.stadler@jku.at>
parents: 2821
diff changeset
143 x.isDead = isDead;
bd17ac598c6e Graph cloning, initial version (not completely working)
Lukas Stadler <lukas.stadler@jku.at>
parents: 2821
diff changeset
144 return x;
bd17ac598c6e Graph cloning, initial version (not completely working)
Lukas Stadler <lukas.stadler@jku.at>
parents: 2821
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145 }
2507
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
146 }