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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/IsNullNode.java @ 19529:8fc336a04d77

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Create TYPE fields for LIRInstruction and CompositeValue. Renaming NodeClass#get to NodeClass#create.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Fri, 20 Feb 2015 22:22:55 +0100
parents 61d3cb8e1280
children 2fd45bb25118
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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.calc;
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24
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25 import com.oracle.graal.compiler.common.type.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.graph.spi.*;
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28 import com.oracle.graal.nodeinfo.*;
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29 import com.oracle.graal.nodes.*;
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30 import com.oracle.graal.nodes.spi.*;
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31 import com.oracle.graal.nodes.type.*;
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32
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33 /**
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34 * An IsNullNode will be true if the supplied value is null, and false if it is non-null.
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35 */
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36 @NodeInfo
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37 public final class IsNullNode extends UnaryOpLogicNode implements LIRLowerable, Virtualizable, PiPushable {
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38
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39 public static final NodeClass<IsNullNode> TYPE = NodeClass.create(IsNullNode.class);
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40
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41 public IsNullNode(ValueNode object) {
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42 super(TYPE, object);
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43 }
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44
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45 @Override
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46 public void generate(NodeLIRBuilderTool gen) {
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47 // Nothing to do.
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48 }
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49
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50 @Override
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51 public boolean verify() {
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52 assertTrue(getValue() != null, "is null input must not be null");
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53 assertTrue(getValue().stamp() instanceof AbstractPointerStamp, "is null input must be a pointer");
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54 return super.verify();
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55 }
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56
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57 @Override
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58 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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59 if (StampTool.isPointerAlwaysNull(forValue)) {
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60 return LogicConstantNode.tautology();
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61 } else if (StampTool.isPointerNonNull(forValue)) {
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62 return LogicConstantNode.contradiction();
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63 }
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64 return this;
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65 }
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66
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67 @Override
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68 public void virtualize(VirtualizerTool tool) {
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69 if (tool.getObjectState(getValue()) != null) {
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70 tool.replaceWithValue(LogicConstantNode.contradiction(graph()));
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71 }
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72 }
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73
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74 @Override
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75 public boolean push(PiNode parent) {
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76 if (parent.stamp() instanceof ObjectStamp && parent.object().stamp() instanceof ObjectStamp) {
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77 ObjectStamp piStamp = (ObjectStamp) parent.stamp();
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78 ObjectStamp piValueStamp = (ObjectStamp) parent.object().stamp();
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79 if (piStamp.nonNull() == piValueStamp.nonNull() && piStamp.alwaysNull() == piValueStamp.alwaysNull()) {
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80 replaceFirstInput(parent, parent.object());
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81 return true;
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82 }
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83 }
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84 return false;
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85 }
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86
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87 @NodeIntrinsic
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88 public static native IsNullNode isNull(Object object);
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89 }