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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/calc/NullCheckNode.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.calc;
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25 import com.oracle.max.cri.ci.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.spi.*;
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28 import com.oracle.graal.nodes.type.*;
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30 public final class NullCheckNode extends BooleanNode implements Canonicalizable, LIRLowerable {
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32 @Input private ValueNode object;
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33 @Data public final boolean expectedNull;
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34
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35 public ValueNode object() {
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36 return object;
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37 }
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38
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39 /**
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40 * Constructs a new NullCheck instruction.
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41 *
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42 * @param object the instruction producing the object to check against null
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43 * @param expectedNull True when this node checks that the value is null, false when this node checks for non-null
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44 */
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45 public NullCheckNode(ValueNode object, boolean expectedNull) {
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46 super(StampFactory.illegal());
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47 assert object.kind() == CiKind.Object : object.kind();
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48 this.object = object;
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49 this.expectedNull = expectedNull;
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50 }
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51
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52 @Override
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53 public void generate(LIRGeneratorTool gen) {
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54 // Nothing to do.
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55 }
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57 @Override
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58 public boolean verify() {
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59 assertTrue(object().kind().isObject(), "null check input must be an object");
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60 return super.verify();
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61 }
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63 @Override
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64 public ValueNode canonical(CanonicalizerTool tool) {
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65 CiConstant constant = object().asConstant();
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66 if (constant != null) {
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67 assert constant.kind == CiKind.Object;
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68 return ConstantNode.forBoolean(constant.isNull() == expectedNull, graph());
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69 }
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70 if (object.stamp().nonNull()) {
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71 return ConstantNode.forBoolean(!expectedNull, graph());
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72 }
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73 return this;
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74 }
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75
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76 @Override
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77 public BooleanNode negate() {
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78 return graph().unique(new NullCheckNode(object(), !expectedNull));
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79 }
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80 }