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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/InstanceOfNode.java @ 19403:61d3cb8e1280

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Add generic parameter to NodeClass. Change Graph#getNodes(Class) to Graph#getNodes(NodeClass).
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 16 Feb 2015 17:47:43 +0100
parents 7e2c87dae93e
children 8fc336a04d77
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1 /*
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2 * Copyright (c) 2009, 2015, 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.code.*;
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26 import com.oracle.graal.api.meta.*;
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27 import com.oracle.graal.compiler.common.type.*;
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28 import com.oracle.graal.graph.*;
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29 import com.oracle.graal.graph.spi.*;
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30 import com.oracle.graal.nodeinfo.*;
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31 import com.oracle.graal.nodes.*;
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32 import com.oracle.graal.nodes.calc.*;
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33 import com.oracle.graal.nodes.spi.*;
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34
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35 /**
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36 * The {@code InstanceOfNode} represents an instanceof test.
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37 */
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38 @NodeInfo
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39 public final class InstanceOfNode extends UnaryOpLogicNode implements Lowerable, Virtualizable {
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40 public static final NodeClass<InstanceOfNode> TYPE = NodeClass.get(InstanceOfNode.class);
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41
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42 protected final ResolvedJavaType type;
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43 protected JavaTypeProfile profile;
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44
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45 public InstanceOfNode(ResolvedJavaType type, ValueNode object, JavaTypeProfile profile) {
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46 super(TYPE, object);
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47 this.type = type;
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48 this.profile = profile;
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49 assert type != null;
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50 }
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51
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52 public static LogicNode create(ResolvedJavaType type, ValueNode object, JavaTypeProfile profile) {
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53 ObjectStamp objectStamp = (ObjectStamp) object.stamp();
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54 LogicNode constantValue = findSynonym(type, objectStamp.type(), objectStamp.nonNull(), objectStamp.isExactType());
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55 if (constantValue != null) {
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56 return constantValue;
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57 } else {
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58 return new InstanceOfNode(type, object, profile);
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59 }
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60 }
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61
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62 @Override
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63 public void lower(LoweringTool tool) {
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64 tool.getLowerer().lower(this, tool);
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65 }
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66
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67 @Override
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68 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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69 if (!(forValue.stamp() instanceof ObjectStamp)) {
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70 return this;
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71 }
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72 ObjectStamp objectStamp = (ObjectStamp) forValue.stamp();
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73 if (objectStamp.alwaysNull()) {
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74 return LogicConstantNode.contradiction();
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75 }
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76
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77 ResolvedJavaType stampType = objectStamp.type();
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78 if (stampType != null) {
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79 ValueNode result = checkInstanceOf(forValue, stampType, objectStamp.nonNull(), objectStamp.isExactType());
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80 if (result != null) {
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81 return result;
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82 }
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83 Assumptions assumptions = graph().getAssumptions();
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84 if (assumptions != null) {
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85 ResolvedJavaType exact = stampType.findUniqueConcreteSubtype();
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86 if (exact != null) {
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87 result = checkInstanceOf(forValue, exact, objectStamp.nonNull(), true);
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88 if (result != null) {
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89 assumptions.recordConcreteSubtype(stampType, exact);
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90 return result;
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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 return this;
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96 }
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97
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98 private ValueNode checkInstanceOf(ValueNode forValue, ResolvedJavaType inputType, boolean nonNull, boolean exactType) {
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99 ValueNode result = findSynonym(type(), inputType, nonNull, exactType);
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100 if (result != null) {
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101 return result;
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102 }
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103 if (type().isAssignableFrom(inputType)) {
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104 if (!nonNull) {
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105 // the instanceof matches if the object is non-null, so return true
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106 // depending on the null-ness.
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107 return LogicNegationNode.create(new IsNullNode(forValue));
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108 }
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109 }
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110 return null;
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111 }
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112
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113 public static LogicNode findSynonym(ResolvedJavaType type, ResolvedJavaType inputType, boolean nonNull, boolean exactType) {
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114 if (inputType == null) {
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115 return null;
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116 }
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117 boolean subType = type.isAssignableFrom(inputType);
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118 if (subType) {
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119 if (nonNull) {
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120 // the instanceOf matches, so return true
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121 return LogicConstantNode.tautology();
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122 }
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123 } else {
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124 if (exactType) {
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125 // since this type check failed for an exact type we know that it can never
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126 // succeed at run time. we also don't care about null values, since they will
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127 // also make the check fail.
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128 return LogicConstantNode.contradiction();
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129 } else {
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130 boolean superType = inputType.isAssignableFrom(type);
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131 if (!superType && !inputType.isInterface() && !type.isInterface()) {
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132 return LogicConstantNode.contradiction();
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133 }
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134 // since the subtype comparison was only performed on a declared type we don't
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135 // really know if it might be true at run time...
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136 }
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137 }
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138 return null;
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139 }
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140
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141 /**
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142 * Gets the type being tested.
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143 */
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144 public ResolvedJavaType type() {
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145 return type;
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146 }
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147
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148 public JavaTypeProfile profile() {
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149 return profile;
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150 }
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151
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152 public void setProfile(JavaTypeProfile profile) {
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153 this.profile = profile;
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154 }
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155
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156 @Override
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157 public void virtualize(VirtualizerTool tool) {
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158 State state = tool.getObjectState(getValue());
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159 if (state != null) {
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160 tool.replaceWithValue(LogicConstantNode.forBoolean(type().isAssignableFrom(state.getVirtualObject().type()), graph()));
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161 }
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162 }
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163 }