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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/java/InstanceOfNode.java @ 5060:4ed4295ce15f

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Update import statements.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 08 Mar 2012 19:11:12 +0100
parents ed559a528128
children
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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.max.cri.ci.*;
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26 import com.oracle.max.cri.ri.*;
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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 TypeCheckNode implements Canonicalizable, LIRLowerable {
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36
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37 @Data private final boolean negated;
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38
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39 public boolean negated() {
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40 return negated;
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41 }
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42
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43 /**
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44 * Constructs a new InstanceOfNode.
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45 *
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46 * @param targetClassInstruction the instruction which produces the target class of the instanceof check
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47 * @param targetClass the class which is the target of the instanceof check
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48 * @param object the instruction producing the object input to this instruction
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49 */
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50 public InstanceOfNode(ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object, boolean negated) {
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51 this(targetClassInstruction, targetClass, object, EMPTY_HINTS, false, negated);
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52 }
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53
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54 public InstanceOfNode(ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object, RiResolvedType[] hints, boolean hintsExact, boolean negated) {
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55 super(targetClassInstruction, targetClass, object, hints, hintsExact, StampFactory.illegal());
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56 this.negated = negated;
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57 assert targetClass != null;
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58 }
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59
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60 @Override
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61 public void generate(LIRGeneratorTool gen) {
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62 }
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63
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64 @Override
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65 public ValueNode canonical(CanonicalizerTool tool) {
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66 assert object() != null : this;
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67 RiResolvedType exact = object().exactType();
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68 if (exact != null) {
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69 boolean result = exact.isSubtypeOf(targetClass());
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70 if (result != negated) {
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71 // The instanceof check reduces to a null check.
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72 return graph().unique(new NullCheckNode(object(), false));
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73 } else {
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74 // The instanceof check can never succeed.
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75 return ConstantNode.forBoolean(false, graph());
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76 }
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77 }
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78 CiConstant constant = object().asConstant();
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79 if (constant != null) {
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80 assert constant.kind == CiKind.Object;
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81 if (constant.isNull()) {
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82 return ConstantNode.forBoolean(negated, graph());
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83 } else {
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84 assert false : "non-null constants are always expected to provide an exactType";
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85 }
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86 }
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87 if (tool.assumptions() != null && hints() != null && targetClass() != null) {
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88 if (!hintsExact() && hints().length == 1 && hints()[0] == targetClass().uniqueConcreteSubtype()) {
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89 tool.assumptions().recordConcreteSubtype(targetClass(), hints()[0]);
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90 return graph().unique(new InstanceOfNode(targetClassInstruction(), targetClass(), object(), hints(), true, negated));
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91 }
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92 }
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93 return this;
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94 }
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95
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96 @Override
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97 public BooleanNode negate() {
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98 return graph().unique(new InstanceOfNode(targetClassInstruction(), targetClass(), object(), hints(), hintsExact(), !negated));
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99 }
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100 }