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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/InstanceOfNode.java @ 7394:94f032472c28

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changed PEA interface: * prepare for more fine-grained object states (thread local, ...) * merge Virtualizable and EscapeAnalyzable interfaces * make MaterializeObjectNode an ArrayLengthProvider
author Lukas Stadler <lukas.stadler@jku.at>
date Wed, 16 Jan 2013 15:15:32 +0100
parents e3f23398d28e
children 5e3d1a68664e
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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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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 BooleanNode 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 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 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 super(StampFactory.condition());
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49 this.type = type;
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50 this.object = object;
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51 this.profile = profile;
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52 assert type != null;
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53 }
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54
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55 @Override
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56 public void lower(LoweringTool tool) {
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57 tool.getRuntime().lower(this, tool);
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58 }
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59
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60 @Override
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61 public ValueNode canonical(CanonicalizerTool tool) {
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62 assert object() != null : this;
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63
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64 ObjectStamp stamp = object().objectStamp();
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65 ResolvedJavaType stampType = stamp.type();
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66
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67 if (stamp.isExactType()) {
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68 boolean subType = type().isAssignableFrom(stampType);
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69
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70 if (subType) {
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71 if (stamp.nonNull()) {
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72 // the instanceOf matches, so return true
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73 return ConstantNode.forBoolean(true, graph());
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74 } else {
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75 // the instanceof matches if the object is non-null, so return true depending on the null-ness.
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76 negateUsages();
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77 return graph().unique(new IsNullNode(object()));
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78 }
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79 } else {
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80 // since this type check failed for an exact type we know that it can never succeed at run time.
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81 // we also don't care about null values, since they will also make the check fail.
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82 return ConstantNode.forBoolean(false, graph());
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83 }
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84 } else if (stampType != null) {
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85 boolean subType = type().isAssignableFrom(stampType);
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86
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87 if (subType) {
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88 if (stamp.nonNull()) {
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89 // the instanceOf matches, so return true
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90 return ConstantNode.forBoolean(true, graph());
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91 } else {
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92 // the instanceof matches if the object is non-null, so return true depending on the null-ness.
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93 negateUsages();
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94 return graph().unique(new IsNullNode(object()));
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95 }
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96 } else {
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97 // 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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98 }
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99 }
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100 if (object().objectStamp().alwaysNull()) {
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101 return ConstantNode.forBoolean(false, graph());
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102 }
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103 return this;
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104 }
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105
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106 public ValueNode object() {
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107 return object;
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108 }
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109
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110 /**
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111 * Gets the type being tested.
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112 */
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113 public ResolvedJavaType type() {
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114 return type;
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115 }
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116
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117 public JavaTypeProfile profile() {
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118 return profile;
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119 }
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120
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121 @Override
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122 public boolean verify() {
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123 for (Node usage : usages()) {
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124 assertTrue(usage instanceof IfNode || usage instanceof ConditionalNode, "unsupported usage: ", usage);
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125 }
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126 return super.verify();
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127 }
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128
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129 @Override
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130 public void virtualize(VirtualizerTool tool) {
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131 State state = tool.getObjectState(object);
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132 if (state != null) {
94f032472c28 changed PEA interface:
Lukas Stadler <lukas.stadler@jku.at>
parents: 7277
diff changeset
133 tool.replaceWithValue(ConstantNode.forBoolean(type().isAssignableFrom(state.getVirtualObject().type()), graph()));
7011
09df32b1dff9 make InstanceOfNode Virtualizable
Lukas Stadler <lukas.stadler@jku.at>
parents: 6647
diff changeset
134 }
09df32b1dff9 make InstanceOfNode Virtualizable
Lukas Stadler <lukas.stadler@jku.at>
parents: 6647
diff changeset
135 }
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
136 }