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annotate graal/GraalCompiler/src/com/sun/c1x/ir/Phi.java @ 2764:99912abb3ff7

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Phi clean up. Phis no longer save their local/stack index.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Mon, 23 May 2011 15:07:01 +0200
parents 5e8a69041cd7
children 43ffa0e47a46
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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.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
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36 private static final int DEFAULT_MAX_VALUES = 2;
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37
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38 private static final int INPUT_COUNT = 1;
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39 private static final int INPUT_BLOCK = 0;
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40
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41 private static final int SUCCESSOR_COUNT = 0;
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42
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43 private int usedInputCount;
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44
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45 @Override
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46 protected int successorCount() {
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47 return super.successorCount() + SUCCESSOR_COUNT;
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48 }
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49
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50 /**
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51 * The join block for this phi.
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52 */
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53 @Override
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54 public BlockBegin block() {
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55 return (BlockBegin) inputs().get(super.inputCount() + INPUT_BLOCK);
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56 }
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57
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58 public Value setBlock(Value n) {
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59 return (BlockBegin) inputs().set(super.inputCount() + INPUT_BLOCK, n);
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60 }
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61
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62 /**
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63 * Create a new Phi for the specified join block and local variable (or operand stack) slot.
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64 * @param kind the type of the variable
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65 * @param block the join point
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66 * @param index the index into the stack (if < 0) or local variables
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67 * @param graph
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68 */
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69 public Phi(CiKind kind, BlockBegin block, Graph graph) {
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70 this(kind, block, DEFAULT_MAX_VALUES, graph);
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71 }
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72
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73 public Phi(CiKind kind, BlockBegin block, int maxValues, Graph graph) {
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74 super(kind, INPUT_COUNT + maxValues, SUCCESSOR_COUNT, graph);
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75 usedInputCount = 1;
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76 setBlock(block);
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77 }
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78
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79 /**
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80 * Get the instruction that produces the value associated with the i'th predecessor
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81 * of the join block.
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82 * @param i the index of the predecessor
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83 * @return the instruction that produced the value in the i'th predecessor
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84 */
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85 public Value valueAt(int i) {
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86 return (Value) inputs().get(i + INPUT_COUNT);
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87 }
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88
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89 /**
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90 * Get the number of inputs to this phi (i.e. the number of predecessors to the join block).
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91 * @return the number of inputs in this phi
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92 */
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93 public int valueCount() {
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94 return usedInputCount - 1;
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95 }
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96
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97 @Override
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98 public void accept(ValueVisitor v) {
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99 v.visitPhi(this);
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100 }
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101
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102 /**
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103 * Make this phi illegal if types were not merged correctly.
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104 */
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105 public void makeDead() {
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106 setFlag(Flag.PhiCannotSimplify);
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107 setFlag(Flag.PhiDead);
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108 }
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109
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110 @Override
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111 public void print(LogStream out) {
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112 out.print("phi function");
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113 }
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114
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115 @Override
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116 public String shortName() {
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117 return "Phi: (" + valueCount() + ")";
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118 }
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119
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120 public Phi addInput(Node y) {
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121 assert !this.isDeleted() && !y.isDeleted();
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122 Phi phi = this;
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123 if (usedInputCount == inputs().size()) {
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124 phi = new Phi(kind, block(), usedInputCount * 2, graph());
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125 for (int i = 0; i < valueCount(); ++i) {
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126 phi.addInput(valueAt(i));
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127 }
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128 phi.addInput(y);
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129 this.replace(phi);
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130 } else {
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131 phi.inputs().set(usedInputCount++, y);
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132 }
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133 return phi;
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134 }
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135 }