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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/NewInstanceNode.java @ 12380:e027a51bdd33

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exclude java.lang.ref.Reference from Escape Analysis
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 14 Oct 2013 10:45:02 +0200
parents 0fc653a9e019
children c6ab6ae1b360
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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25 import java.lang.ref.*;
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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.graph.*;
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29 import com.oracle.graal.graph.spi.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.spi.*;
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32 import com.oracle.graal.nodes.type.*;
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33 import com.oracle.graal.nodes.virtual.*;
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34
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35 /**
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36 * The {@code NewInstanceNode} represents the allocation of an instance class object.
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37 */
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38 @NodeInfo(nameTemplate = "New {p#instanceClass/s}")
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39 public final class NewInstanceNode extends DeoptimizingFixedWithNextNode implements Canonicalizable, Lowerable, VirtualizableAllocation {
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40
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41 private final ResolvedJavaType instanceClass;
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42 private final boolean fillContents;
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43
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44 /**
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45 * Constructs a NewInstanceNode.
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46 *
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47 * @param type the class being allocated
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48 * @param fillContents determines whether the new object's fields should be initialized to
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49 * zero/null.
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50 */
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51 public NewInstanceNode(ResolvedJavaType type, boolean fillContents) {
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52 super(StampFactory.exactNonNull(type));
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53 assert !type.isArray();
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54 this.instanceClass = type;
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55 this.fillContents = fillContents;
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56 }
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57
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58 /**
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59 * Gets the instance class being allocated by this node.
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60 *
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61 * @return the instance class allocated
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62 */
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63 public ResolvedJavaType instanceClass() {
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64 return instanceClass;
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65 }
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66
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67 /**
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68 * @return <code>true</code> if the fields of the new object will be initialized.
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69 */
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70 public boolean fillContents() {
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71 return fillContents;
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72 }
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73
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74 @Override
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75 public Node canonical(CanonicalizerTool tool) {
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76 if (usages().isEmpty()) {
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77 return null;
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78 } else {
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79 return this;
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80 }
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81 }
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82
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83 @Override
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84 public void lower(LoweringTool tool) {
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85 tool.getLowerer().lower(this, tool);
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86 }
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87
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88 @Override
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89 public void virtualize(VirtualizerTool tool) {
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90 /*
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91 * Reference objects can escape into their ReferenceQueue at any safepoint, therefore
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92 * they're excluded from escape analysis.
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93 */
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94 if (!tool.getMetaAccessProvider().lookupJavaType(Reference.class).isAssignableFrom(instanceClass)) {
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95 VirtualInstanceNode virtualObject = new VirtualInstanceNode(instanceClass(), true);
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96 ResolvedJavaField[] fields = virtualObject.getFields();
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97 ValueNode[] state = new ValueNode[fields.length];
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98 for (int i = 0; i < state.length; i++) {
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99 state[i] = ConstantNode.defaultForKind(fields[i].getType().getKind(), graph());
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100 }
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101 tool.createVirtualObject(virtualObject, state, null);
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102 tool.replaceWithVirtual(virtualObject);
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103 }
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104 }
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105
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106 @Override
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107 public boolean canDeoptimize() {
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108 return true;
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109 }
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110 }