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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ObjectEqualsNode.java @ 11881:da9db8331658

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moved Canonicalizable and Simplifiable to the com.oracle.graal.graph project (GRAAL-506)
author Doug Simon <doug.simon@oracle.com>
date Tue, 01 Oct 2013 20:38:25 +0200
parents 9a747d8e0d0f
children 14f38a2acb73
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1 /*
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2 * Copyright (c) 2011, 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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24
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25 import com.oracle.graal.api.meta.*;
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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.nodes.*;
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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 @NodeInfo(shortName = "==")
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33 public final class ObjectEqualsNode extends CompareNode implements Virtualizable {
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34
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35 /**
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36 * Constructs a new object 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 ObjectEqualsNode(ValueNode x, ValueNode y) {
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42 super(x, y);
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43 assert x.kind() == Kind.Object;
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44 assert y.kind() == Kind.Object;
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45 }
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46
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47 @Override
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48 public Condition condition() {
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49 return Condition.EQ;
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50 }
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51
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52 @Override
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53 public boolean unorderedIsTrue() {
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54 return false;
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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 (x() == y()) {
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60 return LogicConstantNode.tautology(graph());
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61 }
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62
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63 if (ObjectStamp.isObjectAlwaysNull(x())) {
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64 return graph().unique(new IsNullNode(y()));
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65 } else if (ObjectStamp.isObjectAlwaysNull(y())) {
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66 return graph().unique(new IsNullNode(x()));
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67 }
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68 if (x().stamp().alwaysDistinct(y().stamp())) {
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69 return LogicConstantNode.contradiction(graph());
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70 }
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71
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72 return super.canonical(tool);
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73 }
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74
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75 private void virtualizeNonVirtualComparison(State state, ValueNode other, VirtualizerTool tool) {
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76 if (!state.getVirtualObject().hasIdentity() && state.getVirtualObject().entryKind(0) == Kind.Boolean) {
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77 if (other.isConstant()) {
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78 Object otherValue = other.asConstant().asObject();
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79 if (otherValue == Boolean.TRUE || otherValue == Boolean.FALSE) {
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80 int expectedValue = (otherValue == Boolean.TRUE) ? 1 : 0;
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81 IntegerEqualsNode equals = new IntegerEqualsNode(state.getEntry(0), ConstantNode.forInt(expectedValue, graph()));
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82 tool.addNode(equals);
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83 tool.replaceWithValue(equals);
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84 } else {
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85 tool.replaceWithValue(LogicConstantNode.contradiction(graph()));
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86 }
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87 }
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88 } else {
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89 // one of them is virtual: they can never be the same objects
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90 tool.replaceWithValue(LogicConstantNode.contradiction(graph()));
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91 }
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92 }
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93
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94 @Override
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95 public void virtualize(VirtualizerTool tool) {
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96 State stateX = tool.getObjectState(x());
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97 State stateY = tool.getObjectState(y());
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98 boolean xVirtual = stateX != null && stateX.getState() == EscapeState.Virtual;
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99 boolean yVirtual = stateY != null && stateY.getState() == EscapeState.Virtual;
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100
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101 if (xVirtual && !yVirtual) {
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102 virtualizeNonVirtualComparison(stateX, stateY != null ? stateY.getMaterializedValue() : y(), tool);
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103 } else if (!xVirtual && yVirtual) {
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104 virtualizeNonVirtualComparison(stateY, stateX != null ? stateX.getMaterializedValue() : x(), tool);
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105 } else if (xVirtual && yVirtual) {
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106 boolean xIdentity = stateX.getVirtualObject().hasIdentity();
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107 boolean yIdentity = stateY.getVirtualObject().hasIdentity();
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108 if (xIdentity ^ yIdentity) {
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109 /*
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110 * One of the two objects has identity, the other doesn't. In code, this looks like
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111 * "Integer.valueOf(a) == new Integer(b)", which is always false.
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112 *
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113 * In other words: an object created via valueOf can never be equal to one created
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114 * by new in the same compilation unit.
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115 */
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116 tool.replaceWithValue(LogicConstantNode.contradiction(graph()));
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117 } else if (!xIdentity && !yIdentity) {
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118 // both are virtual without identity: check contents
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119 assert stateX.getVirtualObject().entryCount() == 1 && stateY.getVirtualObject().entryCount() == 1;
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120 assert stateX.getVirtualObject().type() == stateY.getVirtualObject().type();
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121 assert stateX.getVirtualObject().entryKind(0) == Kind.Int || stateX.getVirtualObject().entryKind(0) == Kind.Long;
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122 IntegerEqualsNode equals = new IntegerEqualsNode(stateX.getEntry(0), stateY.getEntry(0));
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123 tool.addNode(equals);
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124 tool.replaceWithValue(equals);
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Lukas Stadler <lukas.stadler@jku.at>
parents: 7767
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125 } else {
1b2635aa6a1d PEA: handle identity-less objects in IntegerEqualsNode
Lukas Stadler <lukas.stadler@jku.at>
parents: 7767
diff changeset
126 // both are virtual with identity: check if they refer to the same object
1b2635aa6a1d PEA: handle identity-less objects in IntegerEqualsNode
Lukas Stadler <lukas.stadler@jku.at>
parents: 7767
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127 tool.replaceWithValue(LogicConstantNode.forBoolean(stateX == stateY, graph()));
1b2635aa6a1d PEA: handle identity-less objects in IntegerEqualsNode
Lukas Stadler <lukas.stadler@jku.at>
parents: 7767
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128 }
6710
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 5831
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129 }
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 5831
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130 }
5425
0364a2a874b8 changes towards a canonical representation of comparisons:
Lukas Stadler <lukas.stadler@jku.at>
parents:
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131 }