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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/java/InstanceOfNode.java @ 4199:aaac4894175c

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Renamed cri packages from sun to oracle.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 03 Jan 2012 16:29:28 +0100
parents e233f5660da4
children 4a609a685fa4
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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.max.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.max.graal.graph.*;
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28 import com.oracle.max.graal.nodes.*;
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29 import com.oracle.max.graal.nodes.calc.*;
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30 import com.oracle.max.graal.nodes.spi.*;
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31 import com.oracle.max.graal.nodes.type.*;
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32
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33 /**
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34 * The {@code InstanceOfNode} represents an instanceof test.
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35 */
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36 public final class InstanceOfNode extends TypeCheckNode implements Canonicalizable, LIRLowerable {
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37
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38 @Data public final boolean negated;
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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 targetClassInstruction the instruction which produces the target class of the instanceof check
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44 * @param targetClass the class which is the target of the instanceof check
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45 * @param object the instruction producing the object input to this instruction
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46 */
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47 public InstanceOfNode(ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object, boolean negated) {
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48 super(targetClassInstruction, targetClass, object, StampFactory.illegal());
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49 this.negated = negated;
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50 assert targetClass != null;
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51 }
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52
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53 @Override
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54 public void generate(LIRGeneratorTool gen) {
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55 }
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56
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57 @Override
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58 public Node canonical(CanonicalizerTool tool) {
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59 if (object().exactType() != null) {
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60 boolean result = object().exactType().isSubtypeOf(targetClass());
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61 if (result != negated) {
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62 // The instanceof check reduces to a null check.
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63 return graph().unique(new NullCheckNode(object(), false));
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64 } else {
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65 // The instanceof check can never succeed.
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66 return ConstantNode.forBoolean(false, graph());
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67 }
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68 }
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69 CiConstant constant = object().asConstant();
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70 if (constant != null) {
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71 assert constant.kind == CiKind.Object;
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72 if (constant.isNull()) {
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73 return ConstantNode.forBoolean(negated, graph());
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74 } else {
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75 // this should never happen - non-null constants are always expected to provide an exactType
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76 assert false;
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77 }
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78 }
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79 return this;
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80 }
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81
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82 @Override
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83 public BooleanNode negate() {
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84 return graph().unique(new InstanceOfNode(targetClassInstruction(), targetClass(), object(), !negated));
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85 }
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86 }