Mercurial > hg > graal-compiler
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/MethodCallTargetNode.java @ 18504:c2b23f6e4603
Try to bind method after guarded interface invoke
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Tue, 25 Nov 2014 12:25:51 -0800 |
parents | ca81508f2a19 |
children | 2885aafd812f |
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1 /* |
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2 * Copyright (c) 2011, 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.java; |
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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 class MethodCallTargetNode extends CallTargetNode implements IterableNodeType, Simplifiable { |
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36 protected final JavaType returnType; |
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37 |
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38 /** |
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39 * @param arguments |
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40 */ |
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41 public static MethodCallTargetNode create(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, ValueNode[] arguments, JavaType returnType) { |
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42 return new MethodCallTargetNode(invokeKind, targetMethod, arguments, returnType); |
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43 } |
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44 |
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45 protected MethodCallTargetNode(InvokeKind invokeKind, ResolvedJavaMethod targetMethod, ValueNode[] arguments, JavaType returnType) { |
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46 super(arguments, targetMethod, invokeKind); |
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47 this.returnType = returnType; |
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48 } |
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49 |
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50 /** |
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51 * Gets the instruction that produces the receiver object for this invocation, if any. |
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52 * |
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53 * @return the instruction that produces the receiver object for this invocation if any, |
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54 * {@code null} if this invocation does not take a receiver object |
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55 */ |
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56 public ValueNode receiver() { |
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57 return isStatic() ? null : arguments().get(0); |
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58 } |
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59 |
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60 /** |
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61 * Checks whether this is an invocation of a static method. |
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62 * |
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63 * @return {@code true} if the invocation is a static invocation |
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64 */ |
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65 public boolean isStatic() { |
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66 return invokeKind() == InvokeKind.Static; |
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67 } |
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68 |
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69 public Kind returnKind() { |
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70 return targetMethod().getSignature().getReturnKind(); |
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71 } |
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72 |
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73 public Invoke invoke() { |
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74 return (Invoke) this.usages().first(); |
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75 } |
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76 |
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77 @Override |
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78 public boolean verify() { |
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79 assert usages().count() <= 1 : "call target may only be used by a single invoke"; |
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80 for (Node n : usages()) { |
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81 assertTrue(n instanceof Invoke, "call target can only be used from an invoke (%s)", n); |
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82 } |
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83 if (invokeKind() == InvokeKind.Special || invokeKind() == InvokeKind.Static) { |
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84 assertFalse(targetMethod().isAbstract(), "special calls or static calls are only allowed for concrete methods (%s)", targetMethod()); |
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85 } |
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86 if (invokeKind() == InvokeKind.Static) { |
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87 assertTrue(targetMethod().isStatic(), "static calls are only allowed for static methods (%s)", targetMethod()); |
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88 } else { |
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89 assertFalse(targetMethod().isStatic(), "static calls are only allowed for non-static methods (%s)", targetMethod()); |
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90 } |
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91 return super.verify(); |
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92 } |
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93 |
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94 @Override |
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95 public String toString(Verbosity verbosity) { |
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96 if (verbosity == Verbosity.Long) { |
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97 return super.toString(Verbosity.Short) + "(" + targetMethod() + ")"; |
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98 } else { |
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99 return super.toString(verbosity); |
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100 } |
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101 } |
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102 |
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103 @Override |
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104 public void simplify(SimplifierTool tool) { |
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105 if (invokeKind() == InvokeKind.Interface || invokeKind() == InvokeKind.Virtual) { |
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106 // attempt to devirtualize the call |
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107 |
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108 // check for trivial cases (e.g. final methods, nonvirtual methods) |
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109 if (targetMethod().canBeStaticallyBound()) { |
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110 setInvokeKind(InvokeKind.Special); |
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111 return; |
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112 } |
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113 |
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114 // check if the type of the receiver can narrow the result |
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115 if (tryToResolveMethod(tool)) { |
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116 return; |
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117 } |
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118 |
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119 ValueNode receiver = receiver(); |
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120 |
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121 // try to turn an interface call into a virtual call |
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122 ResolvedJavaType declaredReceiverType = targetMethod().getDeclaringClass(); |
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123 /* |
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124 * We need to check the invoke kind to avoid recursive simplification for virtual |
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125 * interface methods calls. |
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126 */ |
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127 if (declaredReceiverType.isInterface() && !invokeKind().equals(InvokeKind.Virtual)) { |
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128 tryCheckCastSingleImplementor(tool, receiver, declaredReceiverType); |
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129 } |
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130 |
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131 if (invokeKind().equals(InvokeKind.Interface) && receiver instanceof UncheckedInterfaceProvider) { |
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132 UncheckedInterfaceProvider uncheckedInterfaceProvider = (UncheckedInterfaceProvider) receiver; |
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133 Stamp uncheckedStamp = uncheckedInterfaceProvider.uncheckedStamp(); |
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134 if (uncheckedStamp != null) { |
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135 ResolvedJavaType uncheckedReceiverType = StampTool.typeOrNull(uncheckedStamp); |
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136 if (uncheckedReceiverType.isInterface()) { |
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137 tryCheckCastSingleImplementor(tool, receiver, uncheckedReceiverType); |
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138 } |
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139 } |
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140 } |
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141 } |
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142 } |
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143 |
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144 /** |
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145 * Try to use receiver type information to statically bind the method. |
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146 * |
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147 * @param tool |
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148 * @return true if successfully converted to InvokeKind.Special |
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149 */ |
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150 private boolean tryToResolveMethod(SimplifierTool tool) { |
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151 ValueNode receiver = receiver(); |
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152 ResolvedJavaType type = StampTool.typeOrNull(receiver); |
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153 if (type == null && invokeKind == InvokeKind.Virtual) { |
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154 // For virtual calls, we are guaranteed to receive a correct receiver type. |
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155 type = targetMethod.getDeclaringClass(); |
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156 } |
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157 if (type != null && (invoke().stateAfter() != null || invoke().stateDuring() != null)) { |
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158 /* |
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159 * either the holder class is exact, or the receiver object has an exact type, or it's |
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160 * an array type |
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161 */ |
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162 ResolvedJavaMethod resolvedMethod = type.resolveConcreteMethod(targetMethod(), invoke().getContextType()); |
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163 if (resolvedMethod != null && (resolvedMethod.canBeStaticallyBound() || StampTool.isExactType(receiver) || type.isArray())) { |
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164 setInvokeKind(InvokeKind.Special); |
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165 setTargetMethod(resolvedMethod); |
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166 return true; |
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167 } |
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168 if (tool.assumptions() != null && tool.assumptions().useOptimisticAssumptions()) { |
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169 ResolvedJavaType uniqueConcreteType = type.findUniqueConcreteSubtype(); |
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170 if (uniqueConcreteType != null) { |
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171 ResolvedJavaMethod methodFromUniqueType = uniqueConcreteType.resolveConcreteMethod(targetMethod(), invoke().getContextType()); |
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172 if (methodFromUniqueType != null) { |
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173 tool.assumptions().recordConcreteSubtype(type, uniqueConcreteType); |
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174 setInvokeKind(InvokeKind.Special); |
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175 setTargetMethod(methodFromUniqueType); |
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176 return true; |
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177 } |
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178 } |
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179 |
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180 ResolvedJavaMethod uniqueConcreteMethod = type.findUniqueConcreteMethod(targetMethod()); |
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181 if (uniqueConcreteMethod != null) { |
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182 tool.assumptions().recordConcreteMethod(targetMethod(), type, uniqueConcreteMethod); |
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183 setInvokeKind(InvokeKind.Special); |
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184 setTargetMethod(uniqueConcreteMethod); |
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185 return true; |
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186 } |
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187 } |
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188 } |
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189 return false; |
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190 } |
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191 |
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192 private void tryCheckCastSingleImplementor(SimplifierTool tool, ValueNode receiver, ResolvedJavaType declaredReceiverType) { |
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193 ResolvedJavaType singleImplementor = declaredReceiverType.getSingleImplementor(); |
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194 if (singleImplementor != null && !singleImplementor.equals(declaredReceiverType)) { |
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195 ResolvedJavaMethod singleImplementorMethod = singleImplementor.resolveMethod(targetMethod(), invoke().getContextType(), true); |
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196 if (singleImplementorMethod != null) { |
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197 assert graph().getGuardsStage().ordinal() < StructuredGraph.GuardsStage.FIXED_DEOPTS.ordinal() : "Graph already fixed!"; |
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198 /** |
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199 * We have an invoke on an interface with a single implementor. We can replace this |
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200 * with an invoke virtual. |
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201 * |
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202 * To do so we need to ensure two properties: 1) the receiver must implement the |
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203 * interface (declaredReceiverType). The verifier does not prove this so we need a |
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204 * dynamic check. 2) we need to ensure that there is still only one implementor of |
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205 * this interface, i.e. that we are calling the right method. We could do this with |
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206 * an assumption but as we need an instanceof check anyway we can verify both |
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207 * properties by checking of the receiver is an instance of the single implementor. |
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208 */ |
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209 LogicNode condition = graph().unique(InstanceOfNode.create(singleImplementor, receiver, getProfile())); |
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210 GuardNode guard = graph().unique( |
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211 GuardNode.create(condition, BeginNode.prevBegin(invoke().asNode()), DeoptimizationReason.OptimizedTypeCheckViolated, DeoptimizationAction.InvalidateRecompile, false, |
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212 JavaConstant.NULL_POINTER)); |
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213 PiNode piNode = graph().unique(PiNode.create(receiver, StampFactory.declaredNonNull(singleImplementor), guard)); |
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214 arguments().set(0, piNode); |
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215 setInvokeKind(InvokeKind.Virtual); |
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216 setTargetMethod(singleImplementorMethod); |
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217 // Now try to bind the method exactly. |
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218 tryToResolveMethod(tool); |
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219 } |
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220 } |
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221 } |
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222 |
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223 private JavaTypeProfile getProfile() { |
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224 assert !isStatic(); |
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225 if (receiver() instanceof TypeProfileProxyNode) { |
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226 // get profile from TypeProfileProxy |
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227 return ((TypeProfileProxyNode) receiver()).getProfile(); |
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228 } |
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229 // get profile from invoke() |
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230 ProfilingInfo profilingInfo = invoke().getContextMethod().getProfilingInfo(); |
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231 return profilingInfo.getTypeProfile(invoke().bci()); |
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232 } |
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233 |
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234 @Override |
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235 public Stamp returnStamp() { |
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236 Kind returnKind = targetMethod().getSignature().getReturnKind(); |
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237 if (returnKind == Kind.Object && returnType instanceof ResolvedJavaType) { |
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238 return StampFactory.declared((ResolvedJavaType) returnType); |
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239 } else { |
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240 return StampFactory.forKind(returnKind); |
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241 } |
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242 } |
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243 |
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244 public JavaType returnType() { |
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245 return returnType; |
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246 } |
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247 |
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248 @Override |
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249 public String targetName() { |
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250 if (targetMethod() == null) { |
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251 return "??Invalid!"; |
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252 } |
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253 return targetMethod().format("%h.%n"); |
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254 } |
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255 |
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256 public static MethodCallTargetNode find(StructuredGraph graph, ResolvedJavaMethod method) { |
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257 for (MethodCallTargetNode target : graph.getNodes(MethodCallTargetNode.class)) { |
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258 if (target.targetMethod().equals(method)) { |
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259 return target; |
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260 } |
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261 } |
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262 return null; |
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263 } |
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264 } |