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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/LoadHubNode.java @ 19526:8fc336a04d77

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Create TYPE fields for LIRInstruction and CompositeValue. Renaming NodeClass#get to NodeClass#create.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Fri, 20 Feb 2015 22:22:55 +0100
parents 61d3cb8e1280
children 3362ba500371
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1 /*
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2 * Copyright (c) 2011, 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
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33 /**
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34 * Loads an object's hub. The object is not null-checked by this operation.
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35 */
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36 @NodeInfo
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37 public final class LoadHubNode extends FloatingGuardedNode implements Lowerable, Canonicalizable, Virtualizable {
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38
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39 public static final NodeClass<LoadHubNode> TYPE = NodeClass.create(LoadHubNode.class);
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40 @Input ValueNode value;
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41
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42 public ValueNode getValue() {
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43 return value;
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44 }
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45
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46 private static Stamp hubStamp(StampProvider stampProvider, ValueNode value) {
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47 assert value.stamp() instanceof ObjectStamp;
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48 return stampProvider.createHubStamp(((ObjectStamp) value.stamp()));
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49 }
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50
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51 public LoadHubNode(@InjectedNodeParameter StampProvider stampProvider, ValueNode value) {
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52 this(stampProvider, value, null);
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53 }
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54
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55 public LoadHubNode(@InjectedNodeParameter StampProvider stampProvider, ValueNode value, ValueNode guard) {
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56 super(TYPE, hubStamp(stampProvider, value), (GuardingNode) guard);
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57 assert value != guard;
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58 this.value = value;
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59 }
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60
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61 @Override
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62 public void lower(LoweringTool tool) {
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63 if (tool.getLoweringStage() == LoweringTool.StandardLoweringStage.HIGH_TIER) {
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64 return;
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65 }
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66 tool.getLowerer().lower(this, tool);
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67 }
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68
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69 @Override
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70 public ValueNode canonical(CanonicalizerTool tool) {
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71 MetaAccessProvider metaAccess = tool.getMetaAccess();
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72 if (metaAccess != null && getValue().stamp() instanceof ObjectStamp) {
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73 ObjectStamp objectStamp = (ObjectStamp) getValue().stamp();
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74
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75 ResolvedJavaType exactType;
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76 if (objectStamp.isExactType()) {
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77 exactType = objectStamp.type();
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78 } else if (objectStamp.type() != null && graph().getAssumptions() != null) {
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79 exactType = objectStamp.type().findUniqueConcreteSubtype();
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80 if (exactType != null) {
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81 graph().getAssumptions().recordConcreteSubtype(objectStamp.type(), exactType);
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82 }
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83 } else {
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84 exactType = null;
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85 }
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86
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87 if (exactType != null) {
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88 return ConstantNode.forConstant(stamp(), exactType.getObjectHub(), metaAccess);
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89 }
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90 }
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91 return this;
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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 state = tool.getObjectState(value);
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97 if (state != null) {
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98 Constant constantHub = state.getVirtualObject().type().getObjectHub();
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99 tool.replaceWithValue(ConstantNode.forConstant(stamp(), constantHub, tool.getMetaAccessProvider(), graph()));
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100 }
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101 }
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102 }