Mercurial > hg > truffle
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConditionalNode.java @ 18998:ec0733b5a90a
Allow final modifier on node subclasses and start adding the modifier to leaf classes.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 28 Jan 2015 02:34:14 +0100 |
parents | f57d86eb036f |
children | 30c8d110b281 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2009, 2014, 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.oracle.graal.nodes.calc; |
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24 |
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25 import static com.oracle.graal.nodes.calc.CompareNode.*; |
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26 |
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27 import com.oracle.graal.api.meta.*; |
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28 import com.oracle.graal.compiler.common.calc.*; |
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29 import com.oracle.graal.compiler.common.type.*; |
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30 import com.oracle.graal.graph.spi.*; |
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31 import com.oracle.graal.nodeinfo.*; |
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32 import com.oracle.graal.nodes.*; |
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33 import com.oracle.graal.nodes.java.*; |
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34 import com.oracle.graal.nodes.spi.*; |
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35 |
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36 /** |
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37 * The {@code ConditionalNode} class represents a comparison that yields one of two values. Note |
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38 * that these nodes are not built directly from the bytecode but are introduced by canonicalization. |
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39 */ |
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40 @NodeInfo |
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41 public final class ConditionalNode extends FloatingNode implements Canonicalizable, LIRLowerable { |
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42 |
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43 @Input(InputType.Condition) LogicNode condition; |
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44 @Input ValueNode trueValue; |
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45 @Input ValueNode falseValue; |
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46 |
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47 public LogicNode condition() { |
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48 return condition; |
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49 } |
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50 |
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51 public ConditionalNode(LogicNode condition) { |
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52 this(condition, ConstantNode.forInt(1, condition.graph()), ConstantNode.forInt(0, condition.graph())); |
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53 } |
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54 |
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55 public ConditionalNode(LogicNode condition, ValueNode trueValue, ValueNode falseValue) { |
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56 super(trueValue.stamp().meet(falseValue.stamp())); |
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57 assert trueValue.stamp().isCompatible(falseValue.stamp()); |
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58 this.condition = condition; |
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59 this.trueValue = trueValue; |
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60 this.falseValue = falseValue; |
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61 } |
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62 |
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63 @Override |
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64 public boolean inferStamp() { |
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65 return updateStamp(trueValue.stamp().meet(falseValue.stamp())); |
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66 } |
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67 |
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68 public ValueNode trueValue() { |
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69 return trueValue; |
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70 } |
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71 |
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72 public ValueNode falseValue() { |
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73 return falseValue; |
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74 } |
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75 |
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76 @Override |
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77 public ValueNode canonical(CanonicalizerTool tool) { |
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78 if (condition instanceof LogicNegationNode) { |
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79 LogicNegationNode negated = (LogicNegationNode) condition; |
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80 return new ConditionalNode(negated.getValue(), falseValue(), trueValue()); |
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81 } |
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82 |
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83 // this optimizes the case where a value that can only be 0 or 1 is materialized to 0 or 1 |
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84 if (trueValue().isConstant() && falseValue().isConstant() && condition instanceof IntegerEqualsNode) { |
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85 IntegerEqualsNode equals = (IntegerEqualsNode) condition; |
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86 if (equals.getY().isConstant() && equals.getY().asConstant().equals(JavaConstant.INT_0) && equals.getX().stamp() instanceof IntegerStamp) { |
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87 IntegerStamp equalsXStamp = (IntegerStamp) equals.getX().stamp(); |
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88 if (equalsXStamp.upMask() == 1) { |
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89 if (trueValue().asConstant().equals(JavaConstant.INT_0) && falseValue().asConstant().equals(JavaConstant.INT_1)) { |
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90 return IntegerConvertNode.convertUnsigned(equals.getX(), stamp()); |
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91 } |
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92 } |
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93 } |
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94 } |
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95 if (condition instanceof LogicConstantNode) { |
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96 LogicConstantNode c = (LogicConstantNode) condition; |
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97 if (c.getValue()) { |
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98 return trueValue(); |
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99 } else { |
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100 return falseValue(); |
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101 } |
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102 } |
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103 if (condition instanceof CompareNode && ((CompareNode) condition).condition() == Condition.EQ) { |
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104 // optimize the pattern (x == y) ? x : y |
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105 CompareNode compare = (CompareNode) condition; |
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106 if ((compare.getX() == trueValue() && compare.getY() == falseValue()) || (compare.getX() == falseValue() && compare.getY() == trueValue())) { |
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107 return falseValue(); |
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108 } |
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109 } |
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110 if (trueValue() == falseValue()) { |
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111 return trueValue(); |
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112 } |
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113 |
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114 return this; |
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115 } |
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116 |
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117 @Override |
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118 public void generate(NodeLIRBuilderTool generator) { |
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119 generator.emitConditional(this); |
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120 } |
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121 |
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122 public ConditionalNode(@InjectedNodeParameter StructuredGraph graph, Condition condition, ValueNode x, ValueNode y) { |
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123 this(createCompareNode(graph, condition, x, y)); |
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124 } |
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125 |
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126 public ConditionalNode(ValueNode type, ValueNode object) { |
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127 this(type.graph().unique(new InstanceOfDynamicNode(type, object))); |
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128 } |
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129 |
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130 @NodeIntrinsic |
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131 public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, int x, int y); |
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132 |
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133 @NodeIntrinsic |
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134 public static native boolean materializeCondition(@ConstantNodeParameter Condition condition, long x, long y); |
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135 |
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136 @NodeIntrinsic |
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137 public static boolean materializeIsInstance(Class<?> mirror, Object object) { |
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138 return mirror.isInstance(object); |
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139 } |
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140 } |