Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Phi.java @ 2581:4a36a0bd6d18
added GraalGraph to classpath, Node as superclass of Value
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Thu, 05 May 2011 13:27:48 +0200 |
parents | 16b9a8b5ad39 |
children | 768d77a1c7af |
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 |
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25 import com.sun.c1x.debug.*; |
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26 import com.sun.c1x.value.*; |
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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 * @author Ben L. Titzer |
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34 */ |
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35 public final class Phi extends Value { |
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36 |
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37 private final BlockBegin block; |
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38 private final int index; |
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39 |
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40 /** |
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41 * Create a new Phi for the specified join block and local variable (or operand stack) slot. |
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42 * @param kind the type of the variable |
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43 * @param block the join point |
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44 * @param index the index into the stack (if < 0) or local variables |
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45 */ |
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46 public Phi(CiKind kind, BlockBegin block, int index) { |
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47 super(kind); |
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48 this.block = block; |
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49 this.index = index; |
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50 } |
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51 |
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52 /** |
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53 * Get the join block for this phi. |
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54 * @return the join block of this phi |
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55 */ |
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56 @Override |
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57 public BlockBegin block() { |
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58 return block; |
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59 } |
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60 |
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61 /** |
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62 * Check whether this phi corresponds to a local variable. |
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63 * @return {@code true} if this phi refers to a local variable |
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64 */ |
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65 public boolean isLocal() { |
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66 return index >= 0; |
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67 } |
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68 |
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69 /** |
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70 * Check whether this phi corresponds to a stack location. |
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71 * @return {@code true} if this phi refers to a stack location |
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72 */ |
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73 public boolean isOnStack() { |
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74 return index < 0; |
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75 } |
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76 |
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77 /** |
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78 * Get the local index of this phi. |
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79 * @return the local index |
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80 */ |
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81 public int localIndex() { |
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82 assert isLocal(); |
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83 return index; |
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84 } |
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85 |
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86 /** |
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87 * Get the stack index of this phi. |
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88 * @return the stack index of this phi |
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89 */ |
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90 public int stackIndex() { |
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91 assert isOnStack(); |
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92 return -(index + 1); |
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93 } |
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94 |
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95 /** |
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96 * Get the instruction that produces the value associated with the i'th predecessor |
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97 * of the join block. |
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98 * @param i the index of the predecessor |
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99 * @return the instruction that produced the value in the i'th predecessor |
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100 */ |
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101 public Value inputAt(int i) { |
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102 FrameState state; |
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103 if (block.isExceptionEntry()) { |
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104 state = block.exceptionHandlerStates().get(i); |
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105 } else { |
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106 state = block.blockPredecessors().get(i).end().stateAfter(); |
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107 } |
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108 return inputIn(state); |
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109 } |
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110 |
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111 /** |
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112 * Gets the instruction that produces the value for this phi in the specified state. |
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113 * @param state the state to access |
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114 * @return the instruction producing the value |
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115 */ |
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116 public Value inputIn(FrameState state) { |
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117 if (isLocal()) { |
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118 return state.localAt(localIndex()); |
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119 } else { |
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120 return state.stackAt(stackIndex()); |
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121 } |
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122 } |
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123 |
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124 /** |
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125 * Get the number of inputs to this phi (i.e. the number of predecessors to the join block). |
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126 * @return the number of inputs in this phi |
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127 */ |
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128 @Override |
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129 public int inputCount() { |
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130 if (block.isExceptionEntry()) { |
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131 return block.exceptionHandlerStates().size(); |
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132 } else { |
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133 return block.blockPredecessors().size(); |
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134 } |
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135 } |
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136 |
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137 @Override |
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138 public void accept(ValueVisitor v) { |
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139 v.visitPhi(this); |
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140 } |
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141 |
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142 /** |
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143 * Make this phi illegal if types were not merged correctly. |
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144 */ |
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145 public void makeDead() { |
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146 setFlag(Flag.PhiCannotSimplify); |
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147 setFlag(Flag.PhiDead); |
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148 } |
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149 |
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150 @Override |
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151 public void print(LogStream out) { |
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152 out.print("phi function"); |
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153 } |
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154 } |