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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/LoadMethodNode.java @ 16258:3a463b85b195

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fix for LoadMethodNode
author Lukas Stadler <lukas.stadler@oracle.com>
date Thu, 26 Jun 2014 17:29:37 +0200
parents 24c30ecf930f
children 5d468add216f
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1 /*
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2 * Copyright (c) 2013, 2014, 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.nodes.*;
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30 import com.oracle.graal.nodes.spi.*;
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31 import com.oracle.graal.nodes.type.*;
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32
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33 /**
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34 * Loads a method from the virtual method table of a given hub.
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35 */
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36 public final class LoadMethodNode extends FixedWithNextNode implements Lowerable, Canonicalizable {
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37
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38 @Input private ValueNode hub;
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39 private final ResolvedJavaMethod method;
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40 private final ResolvedJavaType receiverType;
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41
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42 public ValueNode getHub() {
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43 return hub;
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44 }
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45
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46 public LoadMethodNode(ResolvedJavaMethod method, ResolvedJavaType receiverType, ValueNode hub, Kind kind) {
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47 super(kind == Kind.Object ? StampFactory.objectNonNull() : StampFactory.forKind(kind));
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48 this.receiverType = receiverType;
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49 this.hub = hub;
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50 this.method = method;
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51 assert !method.isAbstract() : "Cannot load abstract method from a hub";
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52 assert !method.isStatic() : "Cannot load a static method from a hub";
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53 assert method.isInVirtualMethodTable(receiverType);
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54 }
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55
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56 @Override
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57 public void lower(LoweringTool tool) {
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58 tool.getLowerer().lower(this, tool);
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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 (hub instanceof LoadHubNode) {
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64 ValueNode object = ((LoadHubNode) hub).getValue();
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65 ResolvedJavaType type = StampTool.typeOrNull(object);
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66 if (StampTool.isExactType(object)) {
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67 return resolveExactMethod(tool, type);
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68 }
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69 if (type != null && tool.assumptions().useOptimisticAssumptions()) {
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70 ResolvedJavaMethod resolvedMethod = type.findUniqueConcreteMethod(method);
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71 if (resolvedMethod != null && !type.isInterface() && method.getDeclaringClass().isAssignableFrom(type)) {
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72 tool.assumptions().recordConcreteMethod(method, type, resolvedMethod);
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73 return ConstantNode.forConstant(resolvedMethod.getEncoding(), tool.getMetaAccess());
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74 }
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75 }
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76 }
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77 if (hub.isConstant()) {
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78 return resolveExactMethod(tool, tool.getConstantReflection().asJavaType(hub.asConstant()));
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79 }
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80
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81 return this;
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82 }
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83
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84 /**
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85 * Find the method which would be loaded.
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86 *
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87 * @param tool
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88 * @param type the exact type of object being loaded from
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89 * @return the method which would be invoked for {@code type} or null if it doesn't implement
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90 * the method
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91 */
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92 private Node resolveExactMethod(CanonicalizerTool tool, ResolvedJavaType type) {
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93 ResolvedJavaMethod newMethod = type.resolveMethod(method, type);
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94 if (newMethod == null) {
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95 /*
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96 * This really represent a misuse of LoadMethod since we're loading from a class which
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97 * isn't known to implement the original method but for now at least fold it away.
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98 */
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99 return ConstantNode.forConstant(Constant.NULL_OBJECT, null);
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100 } else {
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101 return ConstantNode.forConstant(newMethod.getEncoding(), tool.getMetaAccess());
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102 }
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103 }
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104
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105 public ResolvedJavaMethod getMethod() {
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106 return method;
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107 }
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108
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109 public ResolvedJavaType getReceiverType() {
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110 return receiverType;
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111 }
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112 }