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annotate graal/GraalCompiler/src/com/sun/c1x/ir/IfOp.java @ 2805:c3f64b66fc78

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Towards removing the next pointer from Constant and ArithmeticOp
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Fri, 27 May 2011 19:57:56 +0200
parents 092e628ddd5d
children bd17ac598c6e
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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.oracle.graal.graph.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.util.*;
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28 import com.sun.cri.bytecode.*;
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29
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30 /**
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31 * The {@code IfOp} class represents a comparison that yields one of two values.
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32 * Note that these nodes are not built directly from the bytecode but are introduced
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33 * by conditional expression elimination.
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34 */
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35 public final class IfOp extends Op2 {
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36
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37 private static final int INPUT_COUNT = 2;
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38 private static final int INPUT_TRUE_VALUE = 0;
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39 private static final int INPUT_FALSE_VALUE = 1;
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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 @Override
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44 protected int inputCount() {
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45 return super.inputCount() + INPUT_COUNT;
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46 }
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47
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48 @Override
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49 protected int successorCount() {
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50 return super.successorCount() + SUCCESSOR_COUNT;
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51 }
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52
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53
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54 /**
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55 * The instruction that produces the value if the comparison is true.
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56 */
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57 public Value trueValue() {
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58 return (Value) inputs().get(super.inputCount() + INPUT_TRUE_VALUE);
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59 }
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60
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61 public Value setTrueValue(Value n) {
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62 return (Value) inputs().set(super.inputCount() + INPUT_TRUE_VALUE, n);
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63 }
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64
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65 /**
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66 * The instruction that produces the value if the comparison is false.
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67 */
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68 public Value falseValue() {
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69 return (Value) inputs().get(super.inputCount() + INPUT_FALSE_VALUE);
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70 }
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71
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72 public Value setFalseValue(Value n) {
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73 return (Value) inputs().set(super.inputCount() + INPUT_FALSE_VALUE, n);
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74 }
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75
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76
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77 Condition cond;
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78
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79 /**
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80 * Constructs a new IfOp.
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81 * @param x the instruction producing the first value to be compared
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82 * @param cond the condition of the comparison
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83 * @param y the instruction producing the second value to be compared
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84 * @param trueValue the value produced if the condition is true
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85 * @param falseValue the value produced if the condition is false
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86 */
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87 public IfOp(Value x, Condition cond, Value y, Value trueValue, Value falseValue, Graph graph) {
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88 // TODO: return the appropriate bytecode IF_ICMPEQ, etc
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89 super(trueValue.kind.meet(falseValue.kind), Bytecodes.ILLEGAL, x, y, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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90 this.cond = cond;
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91 setTrueValue(trueValue);
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92 setFalseValue(falseValue);
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93 }
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94
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95 /**
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96 * Gets the condition of this if operation.
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97 * @return the condition
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98 */
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99 public Condition condition() {
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100 return cond;
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101 }
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102
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103 /**
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104 * Checks whether this comparison operator is commutative (i.e. it is either == or !=).
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105 * @return {@code true} if this comparison is commutative
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106 */
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107 public boolean isCommutative() {
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108 return cond == Condition.EQ || cond == Condition.NE;
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109 }
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110
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111 @Override
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112 public void accept(ValueVisitor v) {
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113 v.visitIfOp(this);
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114 }
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115
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116 @Override
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117 public int valueNumber() {
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118 return Util.hash4(cond.hashCode(), x(), y(), trueValue(), falseValue());
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119 }
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120
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121 @Override
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122 public boolean valueEqual(Node i) {
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123 if (i instanceof IfOp) {
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124 IfOp o = (IfOp) i;
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125 return opcode == o.opcode && x() == o.x() && y() == o.y() && trueValue() == o.trueValue() && falseValue() == o.falseValue();
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126 }
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127 return false;
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128 }
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129
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130 @Override
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131 public void print(LogStream out) {
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132 out.print(x()).
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133 print(' ').
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134 print(condition().operator).
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135 print(' ').
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136 print(y()).
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137 print(" ? ").
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138 print(trueValue()).
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139 print(" : ").
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140 print(falseValue());
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141 }
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142 }