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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/InstanceOfNode.java @ 11880:9a747d8e0d0f

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broadened types in Canonicalizable interface so that it can be moved to the com.oracle.graal.graph project (GRAAL-506)
author Doug Simon <doug.simon@oracle.com>
date Tue, 01 Oct 2013 20:32:47 +0200
parents ae619d70bf4b
children da9db8331658
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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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24
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25 import com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.nodes.calc.*;
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29 import com.oracle.graal.nodes.spi.*;
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30 import com.oracle.graal.nodes.type.*;
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31
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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 final class InstanceOfNode extends LogicNode implements Canonicalizable, Lowerable, Virtualizable {
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36
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37 @Input private ValueNode object;
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38 private final ResolvedJavaType type;
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39 private 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 type the target type of the instanceof check
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45 * @param object the object being tested by the instanceof
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46 */
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47 public InstanceOfNode(ResolvedJavaType type, ValueNode object, JavaTypeProfile profile) {
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48 this.type = type;
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49 this.object = object;
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50 this.profile = profile;
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51 assert type != null;
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52 }
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53
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54 @Override
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55 public void lower(LoweringTool tool) {
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56 tool.getRuntime().lower(this, tool);
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57 }
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58
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59 @Override
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60 public Node canonical(CanonicalizerTool tool) {
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61 Stamp stamp = object().stamp();
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62 if (!(stamp instanceof ObjectStamp)) {
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63 return this;
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64 }
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65 ObjectStamp objectStamp = (ObjectStamp) stamp;
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66 if (objectStamp.alwaysNull()) {
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67 return LogicConstantNode.contradiction(graph());
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68 }
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69
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70 ResolvedJavaType stampType = objectStamp.type();
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71 if (stampType != null) {
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72 boolean subType = type().isAssignableFrom(stampType);
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73 if (subType) {
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74 if (objectStamp.nonNull()) {
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75 // the instanceOf matches, so return true
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76 return LogicConstantNode.tautology(graph());
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77 } else {
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78 // the instanceof matches if the object is non-null, so return true depending on
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79 // the null-ness.
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80 IsNullNode isNull = graph().unique(new IsNullNode(object()));
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81 return graph().unique(new LogicNegationNode(isNull));
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82 }
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83 } else {
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84 if (objectStamp.isExactType()) {
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85 // since this type check failed for an exact type we know that it can never
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86 // succeed at run time. we also don't care about null values, since they will
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87 // also make the check fail.
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88 return LogicConstantNode.contradiction(graph());
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89 } else {
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90 boolean superType = stampType.isAssignableFrom(type());
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91 if (!superType && !stampType.isInterface() && !type().isInterface()) {
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92 return LogicConstantNode.contradiction(graph());
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93 }
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94 // since the subtype comparison was only performed on a declared type we don't
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95 // really know if it might be true at run time...
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96 }
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97 }
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98 }
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99 return this;
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100 }
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101
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102 public ValueNode object() {
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103 return object;
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104 }
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105
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106 /**
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107 * Gets the type being tested.
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108 */
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109 public ResolvedJavaType type() {
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110 return type;
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111 }
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112
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113 public JavaTypeProfile profile() {
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114 return profile;
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115 }
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116
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117 public void setProfile(JavaTypeProfile profile) {
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118 this.profile = profile;
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119 }
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120
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121 @Override
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122 public void virtualize(VirtualizerTool tool) {
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123 State state = tool.getObjectState(object);
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124 if (state != null) {
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125 tool.replaceWithValue(LogicConstantNode.forBoolean(type().isAssignableFrom(state.getVirtualObject().type()), graph()));
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126 }
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127 }
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128 }