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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/UnboxNode.java @ 20074:a7ee2e1f0d4e

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remove UnboxNodes without usages (if object is non-null)
author Lukas Stadler <lukas.stadler@oracle.com>
date Mon, 30 Mar 2015 13:59:59 +0200
parents 8aa5bd9935b3
children a4aa2116cfe0
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1 /*
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2 * Copyright (c) 2013, 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.extended;
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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.compiler.common.type.*;
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27 import com.oracle.graal.graph.*;
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28 import com.oracle.graal.graph.spi.*;
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29 import com.oracle.graal.nodeinfo.*;
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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
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34 @NodeInfo
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35 public final class UnboxNode extends FixedWithNextNode implements Virtualizable, Lowerable, Canonicalizable.Unary<ValueNode> {
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36
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37 public static final NodeClass<UnboxNode> TYPE = NodeClass.create(UnboxNode.class);
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38 @Input protected ValueNode value;
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39 protected final Kind boxingKind;
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40
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41 public ValueNode getValue() {
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42 return value;
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43 }
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44
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45 protected UnboxNode(ValueNode value, Kind boxingKind) {
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46 super(TYPE, StampFactory.forKind(boxingKind.getStackKind()));
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47 this.value = value;
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48 this.boxingKind = boxingKind;
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49 }
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50
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51 public static ValueNode create(MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection, ValueNode value, Kind boxingKind) {
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52 ValueNode synonym = findSynonym(metaAccess, constantReflection, value, boxingKind);
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53 if (synonym != null) {
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54 return synonym;
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55 }
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56 return new UnboxNode(value, boxingKind);
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57 }
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58
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59 public Kind getBoxingKind() {
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60 return boxingKind;
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61 }
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62
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63 @Override
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64 public void lower(LoweringTool tool) {
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65 tool.getLowerer().lower(this, tool);
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66 }
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67
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68 @Override
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69 public void virtualize(VirtualizerTool tool) {
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70 State state = tool.getObjectState(getValue());
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71 if (state != null && state.getState() == EscapeState.Virtual) {
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72 ResolvedJavaType objectType = state.getVirtualObject().type();
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73 ResolvedJavaType expectedType = tool.getMetaAccessProvider().lookupJavaType(boxingKind.toBoxedJavaClass());
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74 if (objectType.equals(expectedType)) {
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75 tool.replaceWithValue(state.getEntry(0));
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76 }
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77 }
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78 }
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79
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80 @Override
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81 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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82 if (hasNoUsages() && StampTool.isPointerNonNull(forValue)) {
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83 return null;
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84 }
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85 ValueNode synonym = findSynonym(tool.getMetaAccess(), tool.getConstantReflection(), forValue, boxingKind);
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86 if (synonym != null) {
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87 return synonym;
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88 }
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89 return this;
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90 }
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91
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92 private static ValueNode findSynonym(MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection, ValueNode forValue, Kind boxingKind) {
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93 if (forValue.isConstant()) {
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94 JavaConstant constant = forValue.asJavaConstant();
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95 JavaConstant unboxed = constantReflection.unboxPrimitive(constant);
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96 if (unboxed != null && unboxed.getKind() == boxingKind) {
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97 return ConstantNode.forConstant(unboxed, metaAccess);
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98 }
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99 } else if (forValue instanceof BoxNode) {
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100 BoxNode box = (BoxNode) forValue;
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101 if (boxingKind == box.getBoxingKind()) {
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102 return box.getValue();
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103 }
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104 }
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105 return null;
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106 }
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107 }