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annotate graal/Compiler/src/com/sun/c1x/ir/Phi.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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children
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2507
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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.predecessors().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 public int inputCount() {
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129 if (block.isExceptionEntry()) {
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130 return block.exceptionHandlerStates().size();
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131 } else {
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132 return block.predecessors().size();
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133 }
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134 }
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135
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136 @Override
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137 public void accept(ValueVisitor v) {
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138 v.visitPhi(this);
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139 }
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140
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141 /**
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142 * Make this phi illegal if types were not merged correctly.
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143 */
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144 public void makeDead() {
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145 setFlag(Flag.PhiCannotSimplify);
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146 setFlag(Flag.PhiDead);
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147 }
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148
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Thomas Wuerthinger <thomas@wuerthinger.net>
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149 @Override
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150 public void print(LogStream out) {
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151 out.print("phi function");
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152 }
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153 }