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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/LoadFieldNode.java @ 16235:0aac7ed51b12

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Temporarily back out faulty changeset cc4b4fd5c484
author Lukas Stadler <lukas.stadler@oracle.com>
date Wed, 25 Jun 2014 18:47:41 +0200
parents cc4b4fd5c484
children 197ae7ce6bf8
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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.java;
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24
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25 import static com.oracle.graal.graph.iterators.NodePredicates.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.compiler.common.type.*;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.graph.spi.*;
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31 import com.oracle.graal.nodes.*;
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32 import com.oracle.graal.nodes.spi.*;
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33 import com.oracle.graal.nodes.type.*;
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34 import com.oracle.graal.nodes.virtual.*;
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35
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36 /**
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37 * The {@code LoadFieldNode} represents a read of a static or instance field.
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38 */
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39 @NodeInfo(nameTemplate = "LoadField#{p#field/s}")
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40 public final class LoadFieldNode extends AccessFieldNode implements Canonicalizable, VirtualizableRoot {
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41
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42 /**
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43 * Creates a new LoadFieldNode instance.
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44 *
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45 * @param object the receiver object
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46 * @param field the compiler interface field
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47 */
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48 public LoadFieldNode(ValueNode object, ResolvedJavaField field) {
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49 super(createStamp(field), object, field);
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50 }
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51
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52 private static Stamp createStamp(ResolvedJavaField field) {
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53 Kind kind = field.getKind();
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54 if (kind == Kind.Object && field.getType() instanceof ResolvedJavaType) {
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55 return StampFactory.declared((ResolvedJavaType) field.getType());
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56 } else {
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57 return StampFactory.forKind(kind);
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58 }
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59 }
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60
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61 @Override
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62 public Node canonical(CanonicalizerTool tool) {
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63 if (usages().isEmpty() && !isVolatile() && (isStatic() || StampTool.isObjectNonNull(object().stamp()))) {
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64 return null;
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65 }
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66 MetaAccessProvider metaAccess = tool.getMetaAccess();
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67 if (tool.canonicalizeReads() && metaAccess != null) {
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68 ConstantNode constant = asConstant(metaAccess);
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69 if (constant != null) {
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70 return constant;
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71 }
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72 PhiNode phi = asPhi(metaAccess);
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73 if (phi != null) {
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74 return phi;
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75 }
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76 }
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77 if (!isStatic() && object().isNullConstant()) {
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78 return graph().add(new DeoptimizeNode(DeoptimizationAction.None, DeoptimizationReason.NullCheckException));
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79 }
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80 return this;
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81 }
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82
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83 /**
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84 * Gets a constant value for this load if possible.
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85 */
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86 public ConstantNode asConstant(MetaAccessProvider metaAccess) {
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87 Constant constant = null;
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88 if (isStatic()) {
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89 constant = field().readConstantValue(null);
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90 } else if (object().isConstant() && !object().isNullConstant()) {
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91 constant = field().readConstantValue(object().asConstant());
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92 }
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93 if (constant != null) {
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94 return ConstantNode.forConstant(constant, metaAccess, graph());
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95 }
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96 return null;
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97 }
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98
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99 private PhiNode asPhi(MetaAccessProvider metaAccess) {
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100 if (!isStatic() && field.isFinal() && object() instanceof ValuePhiNode && ((ValuePhiNode) object()).values().filter(isNotA(ConstantNode.class)).isEmpty()) {
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101 PhiNode phi = (PhiNode) object();
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102 Constant[] constants = new Constant[phi.valueCount()];
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103 for (int i = 0; i < phi.valueCount(); i++) {
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104 Constant constantValue = field().readConstantValue(phi.valueAt(i).asConstant());
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105 if (constantValue == null) {
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106 return null;
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107 }
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108 constants[i] = constantValue;
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109 }
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110 PhiNode newPhi = graph().addWithoutUnique(new ValuePhiNode(stamp(), phi.merge()));
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111 for (int i = 0; i < phi.valueCount(); i++) {
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112 newPhi.addInput(ConstantNode.forConstant(constants[i], metaAccess, graph()));
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113 }
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114 return newPhi;
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115 }
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116 return null;
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117 }
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118
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119 @Override
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120 public void virtualize(VirtualizerTool tool) {
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121 State state = tool.getObjectState(object());
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122 if (state != null && state.getState() == EscapeState.Virtual) {
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123 int fieldIndex = ((VirtualInstanceNode) state.getVirtualObject()).fieldIndex(field());
6710
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6539
diff changeset
124 if (fieldIndex != -1) {
7394
94f032472c28 changed PEA interface:
Lukas Stadler <lukas.stadler@jku.at>
parents: 6710
diff changeset
125 tool.replaceWith(state.getEntry(fieldIndex));
6710
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6539
diff changeset
126 }
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6539
diff changeset
127 }
6db6881c1270 add Virtualizable and VirtualizerTool, refactor PEA to use it
Lukas Stadler <lukas.stadler@jku.at>
parents: 6539
diff changeset
128 }
3733
e233f5660da4 Added Java files from Maxine project.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff changeset
129 }