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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/InstanceOfNode.java @ 16421:c158f653275e

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don't forget to record assumptions
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Mon, 07 Jul 2014 20:26:31 -0700
parents e4ac25d4e13d
children 5d468add216f
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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.java;
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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.compiler.common.type.*;
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27 import com.oracle.graal.graph.spi.*;
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28 import com.oracle.graal.nodes.*;
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29 import com.oracle.graal.nodes.calc.*;
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30 import com.oracle.graal.nodes.spi.*;
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32 /**
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33 * The {@code InstanceOfNode} represents an instanceof test.
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34 */
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35 public class InstanceOfNode extends UnaryOpLogicNode implements Lowerable, Virtualizable {
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36
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37 private final ResolvedJavaType type;
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38 private JavaTypeProfile profile;
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39
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40 /**
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41 * Constructs a new InstanceOfNode.
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42 *
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43 * @param type the target type of the instanceof check
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44 * @param object the object being tested by the instanceof
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45 */
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46 public InstanceOfNode(ResolvedJavaType type, ValueNode object, JavaTypeProfile profile) {
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47 super(object);
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48 this.type = type;
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49 this.profile = profile;
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50 assert type != null;
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51 }
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52
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53 @Override
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54 public void lower(LoweringTool tool) {
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55 tool.getLowerer().lower(this, tool);
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56 }
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57
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58 @Override
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59 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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60 Stamp stamp = forValue.stamp();
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61 if (!(stamp instanceof ObjectStamp)) {
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62 return this;
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63 }
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64 ObjectStamp objectStamp = (ObjectStamp) stamp;
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65 if (objectStamp.alwaysNull()) {
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66 return LogicConstantNode.contradiction();
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67 }
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68
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69 ResolvedJavaType stampType = objectStamp.type();
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70 if (stampType != null) {
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71 ValueNode result = checkInstanceOf(forValue, stampType, objectStamp.nonNull(), objectStamp.isExactType());
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72 if (result != null) {
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73 return result;
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74 }
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75 if (tool.assumptions() != null && tool.assumptions().useOptimisticAssumptions()) {
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76 ResolvedJavaType exact = stampType.findUniqueConcreteSubtype();
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77 if (exact != null) {
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78 result = checkInstanceOf(forValue, exact, objectStamp.nonNull(), true);
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79 if (result != null) {
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80 tool.assumptions().recordConcreteSubtype(stampType, exact);
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81 return result;
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82 }
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83 }
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84 }
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85 }
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86 return this;
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87 }
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88
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89 private ValueNode checkInstanceOf(ValueNode forValue, ResolvedJavaType inputType, boolean nonNull, boolean exactType) {
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90 boolean subType = type().isAssignableFrom(inputType);
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91 if (subType) {
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92 if (nonNull) {
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93 // the instanceOf matches, so return true
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94 return LogicConstantNode.tautology();
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95 }
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96 } else {
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97 if (exactType) {
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98 // since this type check failed for an exact type we know that it can never
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99 // succeed at run time. we also don't care about null values, since they will
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100 // also make the check fail.
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101 return LogicConstantNode.contradiction();
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102 } else {
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103 boolean superType = inputType.isAssignableFrom(type());
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104 if (!superType && !inputType.isInterface() && !type().isInterface()) {
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105 return LogicConstantNode.contradiction();
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106 }
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107 // since the subtype comparison was only performed on a declared type we don't
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108 // really know if it might be true at run time...
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109 }
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110 }
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111 if (type().isAssignableFrom(inputType)) {
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112 if (!nonNull) {
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113 // the instanceof matches if the object is non-null, so return true
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114 // depending on the null-ness.
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115 return new LogicNegationNode(new IsNullNode(forValue));
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116 }
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117 }
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118 return null;
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119 }
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120
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121 /**
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122 * Gets the type being tested.
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123 */
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124 public ResolvedJavaType type() {
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125 return type;
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126 }
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127
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128 public JavaTypeProfile profile() {
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129 return profile;
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130 }
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131
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132 public void setProfile(JavaTypeProfile profile) {
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133 this.profile = profile;
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9360
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134 }
f1170c277b7b Implement instanceof after instanceof swapping.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents: 9360
diff changeset
135
6548
4dc9e468c8b0 The lowering currently does not support a FixedGuard as the usage of an InstanceOfNode
Christian Wimmer <christian.wimmer@oracle.com>
parents: 6302
diff changeset
136 @Override
7011
09df32b1dff9 make InstanceOfNode Virtualizable
Lukas Stadler <lukas.stadler@jku.at>
parents: 6647
diff changeset
137 public void virtualize(VirtualizerTool tool) {
16207
df6f2365b153 rename of x() to getX(), y() to getY() and object() to getValue()
Lukas Stadler <lukas.stadler@oracle.com>
parents: 15831
diff changeset
138 State state = tool.getObjectState(getValue());
7394
94f032472c28 changed PEA interface:
Lukas Stadler <lukas.stadler@jku.at>
parents: 7277
diff changeset
139 if (state != null) {
7767
4a6646d8eb87 separate BooleanNode and ConstantNode hierarchy, rename BooleanNode to LogicNode and LogicNode to BitLogicNode
Lukas Stadler <lukas.stadler@jku.at>
parents: 7530
diff changeset
140 tool.replaceWithValue(LogicConstantNode.forBoolean(type().isAssignableFrom(state.getVirtualObject().type()), graph()));
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09df32b1dff9 make InstanceOfNode Virtualizable
Lukas Stadler <lukas.stadler@jku.at>
parents: 6647
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141 }
09df32b1dff9 make InstanceOfNode Virtualizable
Lukas Stadler <lukas.stadler@jku.at>
parents: 6647
diff changeset
142 }
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
143 }