Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Phi.java @ 2779:93ec3f067420
Changed CriticalEdgeFinder to use LIRBlock.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 25 May 2011 11:04:59 +0200 |
parents | 3e3338a1abb9 |
children | d3fc4fe063bf |
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.ir; |
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24 |
2603 | 25 import com.oracle.graal.graph.*; |
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26 import com.sun.c1x.debug.*; |
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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 Value { |
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34 |
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35 private static final int DEFAULT_MAX_VALUES = 2; |
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36 |
2603 | 37 private static final int INPUT_COUNT = 1; |
38 private static final int INPUT_BLOCK = 0; | |
39 | |
40 private static final int SUCCESSOR_COUNT = 0; | |
41 | |
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42 private int usedInputCount; |
2603 | 43 |
44 @Override | |
45 protected int successorCount() { | |
46 return super.successorCount() + SUCCESSOR_COUNT; | |
47 } | |
48 | |
49 /** | |
50 * The join block for this phi. | |
51 */ | |
52 @Override | |
53 public BlockBegin block() { | |
54 return (BlockBegin) inputs().get(super.inputCount() + INPUT_BLOCK); | |
55 } | |
56 | |
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57 public Value setBlock(Value n) { |
2603 | 58 return (BlockBegin) inputs().set(super.inputCount() + INPUT_BLOCK, n); |
59 } | |
60 | |
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61 /** |
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62 * Create a new Phi for the specified join block and local variable (or operand stack) slot. |
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63 * @param kind the type of the variable |
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64 * @param block the join point |
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65 * @param index the index into the stack (if < 0) or local variables |
2603 | 66 * @param graph |
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67 */ |
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68 public Phi(CiKind kind, BlockBegin block, Graph graph) { |
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69 this(kind, block, DEFAULT_MAX_VALUES, graph); |
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70 } |
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71 |
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72 public Phi(CiKind kind, BlockBegin block, int maxValues, Graph graph) { |
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73 super(kind, INPUT_COUNT + maxValues, SUCCESSOR_COUNT, graph); |
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74 usedInputCount = 1; |
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75 setBlock(block); |
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76 } |
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77 |
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78 /** |
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79 * Get the instruction that produces the value associated with the i'th predecessor |
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80 * of the join block. |
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81 * @param i the index of the predecessor |
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82 * @return the instruction that produced the value in the i'th predecessor |
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83 */ |
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84 public Value valueAt(int i) { |
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85 return (Value) inputs().get(i + INPUT_COUNT); |
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86 } |
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87 |
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88 /** |
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89 * Get the number of inputs to this phi (i.e. the number of predecessors to the join block). |
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90 * @return the number of inputs in this phi |
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91 */ |
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92 public int valueCount() { |
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93 return usedInputCount - 1; |
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94 } |
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95 |
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96 @Override |
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97 public void accept(ValueVisitor v) { |
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98 v.visitPhi(this); |
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99 } |
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100 |
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101 /** |
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102 * Make this phi illegal if types were not merged correctly. |
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103 */ |
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104 public void makeDead() { |
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105 setFlag(Flag.PhiCannotSimplify); |
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106 setFlag(Flag.PhiDead); |
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107 } |
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108 |
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109 @Override |
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110 public void print(LogStream out) { |
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111 out.print("phi function ("); |
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112 for (int i = 0; i < inputs().size(); ++i) { |
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113 if (i != 0) { |
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114 out.print(' '); |
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115 } |
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116 out.print((Value) inputs().get(i)); |
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117 } |
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118 out.print(')'); |
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119 } |
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120 |
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121 @Override |
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122 public String shortName() { |
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123 return "Phi: (" + valueCount() + ")"; |
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124 } |
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125 |
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126 public Phi addInput(Node y) { |
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127 assert !this.isDeleted() && !y.isDeleted(); |
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128 Phi phi = this; |
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129 if (usedInputCount == inputs().size()) { |
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130 phi = new Phi(kind, block(), usedInputCount * 2, graph()); |
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131 for (int i = 0; i < valueCount(); ++i) { |
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132 phi.addInput(valueAt(i)); |
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133 } |
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134 phi.addInput(y); |
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135 this.replace(phi); |
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136 } else { |
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137 phi.inputs().set(usedInputCount++, y); |
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138 } |
5e8a69041cd7
Model phi inputs as direct inputs in the graph instead of referring to the framestates of the predecessors.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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139 return phi; |
5e8a69041cd7
Model phi inputs as direct inputs in the graph instead of referring to the framestates of the predecessors.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
2707
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140 } |
2769
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
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141 |
dd6419f4bfe2
Fixed several issues with incorrect predecessor count/order. One known issue around exception dispatch remaining in fop.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
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142 public void removeInput(int index) { |
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
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143 inputs().set(index, null); |
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
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144 for (int i = index + 1; i < usedInputCount; ++i) { |
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
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145 inputs().set(i - 1, inputs().get(i)); |
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
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changeset
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146 } |
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
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147 usedInputCount--; |
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
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changeset
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148 } |
2507
9ec15d6914ca
Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff
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149 } |