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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/PointerEqualsNode.java @ 18360:6a5dc0bbebe7

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Introduce PointerEqualsNode for metaspace pointer comparison.
author Roland Schatz <roland.schatz@oracle.com>
date Wed, 12 Nov 2014 11:48:54 +0100
parents graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ObjectEqualsNode.java@9619ba4daf4c
children ca81508f2a19
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1 /*
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2 * Copyright (c) 2011, 2014, 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.calc.*;
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26 import com.oracle.graal.compiler.common.type.*;
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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.util.*;
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31
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32 @NodeInfo(shortName = "==")
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33 public class PointerEqualsNode extends CompareNode {
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34
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35 /**
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36 * Constructs a new pointer equality comparison node.
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37 *
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38 * @param x the instruction producing the first input to the instruction
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39 * @param y the instruction that produces the second input to this instruction
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40 */
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41 public static PointerEqualsNode create(ValueNode x, ValueNode y) {
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42 return new PointerEqualsNode(x, y);
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43 }
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44
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45 protected PointerEqualsNode(ValueNode x, ValueNode y) {
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46 super(x, y);
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47 assert x.stamp() instanceof AbstractPointerStamp;
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48 assert y.stamp() instanceof AbstractPointerStamp;
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49 }
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50
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51 @Override
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52 public Condition condition() {
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53 return Condition.EQ;
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54 }
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55
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56 @Override
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57 public boolean unorderedIsTrue() {
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58 return false;
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59 }
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60
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61 @Override
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62 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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63 if (GraphUtil.unproxify(forX) == GraphUtil.unproxify(forY)) {
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64 return LogicConstantNode.tautology();
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65 } else if (forX.stamp().alwaysDistinct(forY.stamp())) {
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66 return LogicConstantNode.contradiction();
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67 }
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68 return super.canonical(tool, forX, forY);
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69 }
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70
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71 @Override
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72 protected CompareNode duplicateModified(ValueNode newX, ValueNode newY) {
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73 return PointerEqualsNode.create(newX, newY);
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74 }
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75 }