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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/InstanceOfNode.java @ 5891:fd8832ae511d

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removed artifacts of defunct type system
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 20 Aug 2012 15:21:31 +0200
parents ed08c40d67de
children 5d7d9a6953bd
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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.oracle.graal.nodes.java;
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.calc.*;
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28 import com.oracle.graal.nodes.spi.*;
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29 import com.oracle.graal.nodes.type.*;
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31 /**
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32 * The {@code InstanceOfNode} represents an instanceof test.
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33 */
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34 public final class InstanceOfNode extends BooleanNode implements Canonicalizable, LIRLowerable {
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35
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36 @Input private ValueNode object;
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37 @Input private ValueNode targetClassInstruction;
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38 private final ResolvedJavaType targetClass;
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39 private final JavaTypeProfile profile;
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40
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41 /**
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42 * Constructs a new InstanceOfNode.
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43 *
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44 * @param targetClassInstruction the instruction which produces the target class of the instanceof check
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45 * @param targetClass the class which is the target of the instanceof check
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46 * @param object the instruction producing the object input to this instruction
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47 */
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48 public InstanceOfNode(ValueNode targetClassInstruction, ResolvedJavaType targetClass, ValueNode object) {
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49 this(targetClassInstruction, targetClass, object, null);
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50 }
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51
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52 public InstanceOfNode(ValueNode targetClassInstruction, ResolvedJavaType targetClass, ValueNode object, JavaTypeProfile profile) {
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53 super(StampFactory.condition());
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54 this.targetClassInstruction = targetClassInstruction;
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55 this.targetClass = targetClass;
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56 this.object = object;
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57 this.profile = profile;
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58 assert targetClass != null;
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59 }
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60
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61 @Override
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62 public void generate(LIRGeneratorTool gen) {
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63 }
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64
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65 @Override
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66 public ValueNode canonical(CanonicalizerTool tool) {
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67 assert object() != null : this;
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68
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69 ObjectStamp stamp = object().objectStamp();
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70 ResolvedJavaType type = stamp.type();
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71
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72 if (stamp.isExactType()) {
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73 boolean subType = type.isSubtypeOf(targetClass());
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74
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75 if (subType) {
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76 if (stamp.nonNull()) {
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77 // the instanceOf matches, so return true
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78 return ConstantNode.forBoolean(true, graph());
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79 } else {
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80 // the instanceof matches if the object is non-null, so return true depending on the null-ness.
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81 negateUsages();
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82 return graph().unique(new IsNullNode(object()));
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83 }
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84 } else {
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85 // since this type check failed for an exact type we know that it can never succeed at run time.
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86 // we also don't care about null values, since they will also make the check fail.
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87 return ConstantNode.forBoolean(false, graph());
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88 }
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89 } else if (type != null) {
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90 boolean subType = type.isSubtypeOf(targetClass());
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91
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92 if (subType) {
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93 if (stamp.nonNull()) {
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94 // the instanceOf matches, so return true
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95 return ConstantNode.forBoolean(true, graph());
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96 } else {
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97 // the instanceof matches if the object is non-null, so return true depending on the null-ness.
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98 negateUsages();
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99 return graph().unique(new IsNullNode(object()));
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100 }
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101 } else {
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102 // since the subtype comparison was only performed on a declared type we don't really know if it might be true at run time...
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103 }
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104 }
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105 if (object().objectStamp().alwaysNull()) {
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106 return ConstantNode.forBoolean(false, graph());
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107 }
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108 return this;
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109 }
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110
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111 public ValueNode object() {
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112 return object;
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113 }
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114
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115 public ValueNode targetClassInstruction() {
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116 return targetClassInstruction;
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117 }
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118
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119 /**
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120 * Gets the target class, i.e. the class being cast to, or the class being tested against.
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121 * @return the target class
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122 */
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123 public ResolvedJavaType targetClass() {
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124 return targetClass;
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125 }
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126
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127 public JavaTypeProfile profile() {
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128 return profile;
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129 }
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130 }