Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Phi.java @ 2847:caf55daa41dc
Fixed/FLoating Node
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Tue, 31 May 2011 15:19:08 +0200 |
parents | bd17ac598c6e |
children | 7474789a8120 |
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 FixedNode { |
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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 | |
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40 private final int maxValues; |
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41 |
2603 | 42 private static final int SUCCESSOR_COUNT = 0; |
43 | |
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44 private int usedInputCount; |
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45 private boolean isDead; |
2603 | 46 |
47 @Override | |
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48 protected int inputCount() { |
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49 return super.inputCount() + INPUT_COUNT + maxValues; |
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50 } |
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51 |
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52 @Override |
2603 | 53 protected int successorCount() { |
54 return super.successorCount() + SUCCESSOR_COUNT; | |
55 } | |
56 | |
57 /** | |
58 * The join block for this phi. | |
59 */ | |
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60 public Merge block() { |
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61 return (Merge) inputs().get(super.inputCount() + INPUT_BLOCK); |
2603 | 62 } |
63 | |
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64 public Value setBlock(Value n) { |
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65 return (Merge) inputs().set(super.inputCount() + INPUT_BLOCK, n); |
2603 | 66 } |
67 | |
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68 /** |
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69 * Create a new Phi for the specified join block and local variable (or operand stack) slot. |
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70 * @param kind the type of the variable |
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71 * @param block the join point |
2603 | 72 * @param graph |
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73 */ |
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74 public Phi(CiKind kind, Merge block, Graph graph) { |
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75 this(kind, block, DEFAULT_MAX_VALUES, graph); |
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76 } |
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77 |
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78 public Phi(CiKind kind, Merge block, int maxValues, Graph graph) { |
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79 super(kind, INPUT_COUNT + maxValues, SUCCESSOR_COUNT, graph); |
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80 this.maxValues = maxValues; |
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81 usedInputCount = 1; |
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82 setBlock(block); |
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83 } |
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84 |
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85 /** |
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86 * Get the instruction that produces the value associated with the i'th predecessor |
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87 * of the join block. |
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88 * @param i the index of the predecessor |
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89 * @return the instruction that produced the value in the i'th predecessor |
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90 */ |
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91 public Value valueAt(int i) { |
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92 return (Value) inputs().get(i + INPUT_COUNT); |
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93 } |
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94 |
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95 /** |
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96 * Get the number of inputs to this phi (i.e. the number of predecessors to the join block). |
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97 * @return the number of inputs in this phi |
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98 */ |
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99 public int valueCount() { |
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100 return usedInputCount - 1; |
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101 } |
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102 |
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103 @Override |
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104 public void accept(ValueVisitor v) { |
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105 v.visitPhi(this); |
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106 } |
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107 |
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108 /** |
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109 * Make this phi illegal if types were not merged correctly. |
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110 */ |
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111 public void makeDead() { |
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112 isDead = true; |
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113 } |
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114 |
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115 public boolean isDead() { |
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116 return isDead; |
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117 } |
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118 |
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119 @Override |
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120 public void print(LogStream out) { |
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121 out.print("phi function ("); |
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122 for (int i = 0; i < inputs().size(); ++i) { |
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123 if (i != 0) { |
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124 out.print(' '); |
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125 } |
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126 out.print((Value) inputs().get(i)); |
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127 } |
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128 out.print(')'); |
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129 } |
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130 |
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131 @Override |
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132 public String shortName() { |
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133 StringBuilder str = new StringBuilder(); |
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134 for (int i = 1; i < inputs().size(); ++i) { |
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135 if (i != 1) { |
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136 str.append(' '); |
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137 } |
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138 if (inputs().get(i) != null) { |
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139 str.append(inputs().get(i).id()); |
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140 } else { |
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141 str.append("-"); |
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142 } |
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143 } |
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144 return "Phi: (" + str + ")"; |
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145 } |
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146 |
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147 public Phi addInput(Node y) { |
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148 assert !this.isDeleted() && !y.isDeleted(); |
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149 Phi phi = this; |
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150 if (usedInputCount == inputs().size()) { |
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151 phi = new Phi(kind, block(), usedInputCount * 2, graph()); |
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152 for (int i = 0; i < valueCount(); ++i) { |
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153 phi.addInput(valueAt(i)); |
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154 } |
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155 phi.addInput(y); |
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156 this.replace(phi); |
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157 } else { |
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158 phi.inputs().set(usedInputCount++, y); |
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159 } |
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160 return phi; |
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161 } |
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162 |
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163 public void removeInput(int index) { |
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164 inputs().set(index, null); |
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165 for (int i = index + 1; i < usedInputCount; ++i) { |
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166 inputs().set(i - 1, inputs().get(i)); |
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167 } |
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168 usedInputCount--; |
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169 } |
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170 |
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171 @Override |
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172 public Node copy(Graph into) { |
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173 Phi x = new Phi(kind, null, maxValues, into); |
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174 x.usedInputCount = usedInputCount; |
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175 x.isDead = isDead; |
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176 x.setNonNull(isNonNull()); |
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177 return x; |
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178 } |
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179 } |