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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/LoadMethodNode.java @ 18490:ca81508f2a19

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Generalize NULL handling to work on arbitrary pointers.
author Roland Schatz <roland.schatz@oracle.com>
date Mon, 24 Nov 2014 13:53:14 +0100
parents 0f4813e0b4a9
children 5a21cac1968f
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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.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 /**
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35 * Loads a method from the virtual method table of a given hub.
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36 */
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37 @NodeInfo
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38 public class LoadMethodNode extends FixedWithNextNode implements Lowerable, Canonicalizable {
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39
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40 @Input ValueNode hub;
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41 protected final ResolvedJavaMethod method;
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42 protected final ResolvedJavaType receiverType;
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43
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44 public ValueNode getHub() {
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45 return hub;
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46 }
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47
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48 public static LoadMethodNode create(@InjectedNodeParameter Stamp stamp, ResolvedJavaMethod method, ResolvedJavaType receiverType, ValueNode hub) {
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49 return new LoadMethodNode(stamp, method, receiverType, hub);
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50 }
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51
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52 protected LoadMethodNode(Stamp stamp, ResolvedJavaMethod method, ResolvedJavaType receiverType, ValueNode hub) {
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53 super(stamp);
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54 this.receiverType = receiverType;
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55 this.hub = hub;
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56 this.method = method;
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57 assert !method.isAbstract() : "Cannot load abstract method from a hub";
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58 assert !method.isStatic() : "Cannot load a static method from a hub";
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59 assert method.isInVirtualMethodTable(receiverType);
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60 }
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61
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62 @Override
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63 public void lower(LoweringTool tool) {
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64 tool.getLowerer().lower(this, tool);
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65 }
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66
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67 @Override
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68 public Node canonical(CanonicalizerTool tool) {
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69 if (hub instanceof LoadHubNode) {
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70 ValueNode object = ((LoadHubNode) hub).getValue();
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71 ResolvedJavaType type = StampTool.typeOrNull(object);
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72 if (StampTool.isExactType(object)) {
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73 return resolveExactMethod(tool, type);
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74 }
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75 if (type != null && tool.assumptions().useOptimisticAssumptions()) {
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76 ResolvedJavaMethod resolvedMethod = type.findUniqueConcreteMethod(method);
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77 if (resolvedMethod != null && !type.isInterface() && method.getDeclaringClass().isAssignableFrom(type)) {
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78 tool.assumptions().recordConcreteMethod(method, type, resolvedMethod);
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79 return ConstantNode.forConstant(stamp(), resolvedMethod.getEncoding(), tool.getMetaAccess());
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80 }
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81 }
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82 }
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83 if (hub.isConstant()) {
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84 return resolveExactMethod(tool, tool.getConstantReflection().asJavaType(hub.asConstant()));
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85 }
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86
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87 return this;
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88 }
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89
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90 /**
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91 * Find the method which would be loaded.
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92 *
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93 * @param tool
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94 * @param type the exact type of object being loaded from
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95 * @return the method which would be invoked for {@code type} or null if it doesn't implement
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96 * the method
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97 */
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98 private Node resolveExactMethod(CanonicalizerTool tool, ResolvedJavaType type) {
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99 ResolvedJavaMethod newMethod = type.resolveConcreteMethod(method, type);
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100 if (newMethod == null) {
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101 /*
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102 * This really represent a misuse of LoadMethod since we're loading from a class which
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103 * isn't known to implement the original method but for now at least fold it away.
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104 */
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105 return ConstantNode.forConstant(JavaConstant.NULL_POINTER, null);
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106 } else {
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107 return ConstantNode.forConstant(stamp(), newMethod.getEncoding(), tool.getMetaAccess());
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108 }
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109 }
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110
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111 public ResolvedJavaMethod getMethod() {
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112 return method;
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113 }
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114
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115 public ResolvedJavaType getReceiverType() {
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116 return receiverType;
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117 }
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118 }