Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Phi.java @ 2603:01c5c0443158
new node layout: Phi
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 06 May 2011 11:18:15 +0200 |
parents | 768d77a1c7af |
children | 3558ca7088c0 |
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.c1x.value.*; |
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28 import com.sun.cri.ci.*; |
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29 |
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30 /** |
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31 * The {@code Phi} instruction represents the merging of dataflow |
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32 * in the instruction graph. It refers to a join block and a variable. |
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33 */ |
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34 public final class Phi extends Value { |
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35 |
2603 | 36 private static final int INPUT_COUNT = 1; |
37 private static final int INPUT_BLOCK = 0; | |
38 | |
39 private static final int SUCCESSOR_COUNT = 0; | |
40 | |
41 @Override | |
42 protected int inputCount() { | |
43 return super.inputCount() + INPUT_COUNT; | |
44 } | |
45 | |
46 @Override | |
47 protected int successorCount() { | |
48 return super.successorCount() + SUCCESSOR_COUNT; | |
49 } | |
50 | |
51 /** | |
52 * The join block for this phi. | |
53 */ | |
54 @Override | |
55 public BlockBegin block() { | |
56 return (BlockBegin) inputs().get(super.inputCount() + INPUT_BLOCK); | |
57 } | |
58 | |
59 public BlockBegin setBlock(Value n) { | |
60 return (BlockBegin) inputs().set(super.inputCount() + INPUT_BLOCK, n); | |
61 } | |
62 | |
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63 private final int index; |
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64 |
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65 /** |
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66 * Create a new Phi for the specified join block and local variable (or operand stack) slot. |
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67 * @param kind the type of the variable |
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68 * @param block the join point |
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69 * @param index the index into the stack (if < 0) or local variables |
2603 | 70 * @param graph |
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71 */ |
2603 | 72 public Phi(CiKind kind, BlockBegin block, int index, Graph graph) { |
73 super(kind, INPUT_COUNT, SUCCESSOR_COUNT, graph); | |
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74 this.index = index; |
2603 | 75 setBlock(block); |
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76 } |
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77 |
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78 /** |
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79 * Check whether this phi corresponds to a local variable. |
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80 * @return {@code true} if this phi refers to a local variable |
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81 */ |
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82 public boolean isLocal() { |
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83 return index >= 0; |
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84 } |
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85 |
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86 /** |
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87 * Check whether this phi corresponds to a stack location. |
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88 * @return {@code true} if this phi refers to a stack location |
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89 */ |
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90 public boolean isOnStack() { |
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91 return index < 0; |
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92 } |
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93 |
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94 /** |
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95 * Get the local index of this phi. |
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96 * @return the local index |
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97 */ |
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98 public int localIndex() { |
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99 assert isLocal(); |
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100 return index; |
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101 } |
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102 |
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103 /** |
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104 * Get the stack index of this phi. |
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105 * @return the stack index of this phi |
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106 */ |
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107 public int stackIndex() { |
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108 assert isOnStack(); |
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109 return -(index + 1); |
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110 } |
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111 |
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112 /** |
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113 * Get the instruction that produces the value associated with the i'th predecessor |
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114 * of the join block. |
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115 * @param i the index of the predecessor |
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116 * @return the instruction that produced the value in the i'th predecessor |
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117 */ |
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118 public Value inputAt(int i) { |
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119 FrameState state; |
2603 | 120 if (block().isExceptionEntry()) { |
121 state = block().exceptionHandlerStates().get(i); | |
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122 } else { |
2603 | 123 state = block().blockPredecessors().get(i).end().stateAfter(); |
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124 } |
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125 return inputIn(state); |
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126 } |
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127 |
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128 /** |
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129 * Gets the instruction that produces the value for this phi in the specified state. |
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130 * @param state the state to access |
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131 * @return the instruction producing the value |
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132 */ |
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133 public Value inputIn(FrameState state) { |
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134 if (isLocal()) { |
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135 return state.localAt(localIndex()); |
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136 } else { |
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137 return state.stackAt(stackIndex()); |
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138 } |
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139 } |
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140 |
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141 /** |
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142 * Get the number of inputs to this phi (i.e. the number of predecessors to the join block). |
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143 * @return the number of inputs in this phi |
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144 */ |
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145 public int phiInputCount() { |
2603 | 146 if (block().isExceptionEntry()) { |
147 return block().exceptionHandlerStates().size(); | |
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148 } else { |
2603 | 149 return block().blockPredecessors().size(); |
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150 } |
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151 } |
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152 |
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153 @Override |
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154 public void accept(ValueVisitor v) { |
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155 v.visitPhi(this); |
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156 } |
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157 |
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158 /** |
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159 * Make this phi illegal if types were not merged correctly. |
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160 */ |
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161 public void makeDead() { |
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162 setFlag(Flag.PhiCannotSimplify); |
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163 setFlag(Flag.PhiDead); |
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164 } |
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165 |
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166 @Override |
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167 public void print(LogStream out) { |
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168 out.print("phi function"); |
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169 } |
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170 } |