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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/GetClassNode.java @ 21678:7355942cb270

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Improve lowering of the type check node.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 03 Jun 2015 01:10:18 +0200
parents 48c1ebd24120
children
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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.compiler.common.type.*;
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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.nodeinfo.*;
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29 import com.oracle.graal.nodes.*;
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30 import com.oracle.graal.nodes.calc.*;
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31 import com.oracle.graal.nodes.spi.*;
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32 import com.oracle.jvmci.meta.Assumptions.AssumptionResult;
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33 import com.oracle.jvmci.meta.*;
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34
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35 /**
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36 * Loads an object's class (i.e., this node can be created for {@code object.getClass()}).
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37 */
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38 @NodeInfo
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39 public final class GetClassNode extends FloatingNode implements Lowerable, Canonicalizable, Virtualizable {
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40
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41 public static final NodeClass<GetClassNode> TYPE = NodeClass.create(GetClassNode.class);
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42 @Input ValueNode object;
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43
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44 public ValueNode getObject() {
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45 return object;
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46 }
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47
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48 public GetClassNode(Stamp stamp, ValueNode object) {
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49 super(TYPE, stamp);
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50 this.object = object;
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51 assert ((ObjectStamp) object.stamp()).nonNull();
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52 }
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53
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54 @Override
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55 public void lower(LoweringTool tool) {
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56 tool.getLowerer().lower(this, tool);
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57 }
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58
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59 public static ValueNode tryFold(MetaAccessProvider metaAccess, ValueNode object) {
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60 if (metaAccess != null && object != null && object.stamp() instanceof ObjectStamp) {
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61 ObjectStamp objectStamp = (ObjectStamp) object.stamp();
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62
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63 ResolvedJavaType exactType = null;
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64 if (objectStamp.isExactType()) {
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65 exactType = objectStamp.type();
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66 } else if (objectStamp.type() != null && object.graph().getAssumptions() != null) {
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67 AssumptionResult<ResolvedJavaType> leafConcreteSubtype = objectStamp.type().findLeafConcreteSubtype();
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68 if (leafConcreteSubtype != null) {
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69 exactType = leafConcreteSubtype.getResult();
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70 object.graph().getAssumptions().record(leafConcreteSubtype);
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71 }
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72 }
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73
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74 if (exactType != null) {
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75 return ConstantNode.forConstant(exactType.getJavaClass(), metaAccess);
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76 }
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77 }
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78 return null;
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79 }
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80
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81 @Override
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82 public ValueNode canonical(CanonicalizerTool tool) {
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83 ValueNode folded = tryFold(tool.getMetaAccess(), getObject());
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84 return folded == null ? this : folded;
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85 }
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86
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87 @Override
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88 public void virtualize(VirtualizerTool tool) {
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89 State state = tool.getObjectState(object);
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90 if (state != null) {
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91 Constant javaClass = state.getVirtualObject().type().getJavaClass();
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92 tool.replaceWithValue(ConstantNode.forConstant(stamp(), javaClass, tool.getMetaAccessProvider(), graph()));
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93 }
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94 }
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95 }