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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotSignature.java @ 24114:2b760c6b0561

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missing checks in HotSpotMemoryAccessProviderImpl can cause VM assertions to fail - part 4 (JDK-8177673)
author Doug Simon <doug.simon@oracle.com>
date Sat, 01 Apr 2017 00:53:40 +0200
parents b3a816d3b844
children fbcbf83757cb
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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 jdk.vm.ci.hotspot;
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24
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25 import java.util.ArrayList;
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26 import java.util.List;
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27
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28 import jdk.vm.ci.common.JVMCIError;
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29 import jdk.vm.ci.meta.JavaKind;
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30 import jdk.vm.ci.meta.JavaType;
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31 import jdk.vm.ci.meta.ResolvedJavaType;
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32 import jdk.vm.ci.meta.Signature;
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34 /**
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35 * Represents a method signature.
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36 */
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37 public class HotSpotSignature implements Signature {
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38
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39 private final List<String> parameters = new ArrayList<>();
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40 private final String returnType;
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41 private final String originalString;
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42 private ResolvedJavaType[] parameterTypes;
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43 private ResolvedJavaType returnTypeCache;
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44 private final HotSpotJVMCIRuntimeProvider runtime;
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45
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46 public HotSpotSignature(HotSpotJVMCIRuntimeProvider runtime, String signature) {
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47 this.runtime = runtime;
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48 assert signature.length() > 0;
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49 this.originalString = signature;
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50
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51 if (signature.charAt(0) == '(') {
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52 int cur = 1;
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53 while (cur < signature.length() && signature.charAt(cur) != ')') {
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54 int nextCur = parseSignature(signature, cur);
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55 parameters.add(signature.substring(cur, nextCur));
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56 cur = nextCur;
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57 }
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58
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59 cur++;
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60 int nextCur = parseSignature(signature, cur);
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61 returnType = signature.substring(cur, nextCur);
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62 assert nextCur == signature.length();
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63 } else {
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64 returnType = null;
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65 }
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66 }
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67
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68 public HotSpotSignature(HotSpotJVMCIRuntimeProvider runtime, ResolvedJavaType returnType, ResolvedJavaType... parameterTypes) {
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69 this.runtime = runtime;
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70 this.parameterTypes = parameterTypes.clone();
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71 this.returnTypeCache = returnType;
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72 this.returnType = returnType.getName();
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73 StringBuilder sb = new StringBuilder("(");
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74 for (JavaType type : parameterTypes) {
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75 parameters.add(type.getName());
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76 sb.append(type.getName());
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77 }
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78 sb.append(")").append(returnType.getName());
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79 this.originalString = sb.toString();
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80 assert new HotSpotSignature(runtime, originalString).equals(this);
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81 }
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82
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83 private static int parseSignature(String signature, int start) {
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84 int cur = start;
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85 char first;
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86 do {
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87 first = signature.charAt(cur++);
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88 } while (first == '[');
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89
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90 switch (first) {
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91 case 'L':
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92 while (signature.charAt(cur) != ';') {
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93 cur++;
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94 }
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95 cur++;
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96 break;
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97 case 'V':
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98 case 'I':
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99 case 'B':
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100 case 'C':
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101 case 'D':
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102 case 'F':
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103 case 'J':
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104 case 'S':
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105 case 'Z':
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106 break;
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107 default:
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108 throw new JVMCIError("Invalid character at index %d in signature: %s", cur, signature);
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109 }
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110 return cur;
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111 }
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112
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113 @Override
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114 public int getParameterCount(boolean withReceiver) {
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115 return parameters.size() + (withReceiver ? 1 : 0);
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116 }
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117
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118 @Override
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119 public JavaKind getParameterKind(int index) {
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120 return JavaKind.fromTypeString(parameters.get(index));
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121 }
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122
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123 private static boolean checkValidCache(ResolvedJavaType type, ResolvedJavaType accessingClass) {
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124 assert accessingClass != null;
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125 if (type == null) {
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126 return false;
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127 } else if (type instanceof HotSpotResolvedObjectTypeImpl) {
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128 return ((HotSpotResolvedObjectTypeImpl) type).isDefinitelyResolvedWithRespectTo(accessingClass);
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129 }
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130 return true;
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131 }
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132
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133 private static JavaType getUnresolvedOrPrimitiveType(HotSpotJVMCIRuntimeProvider runtime, String name) {
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134 if (name.length() == 1) {
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135 JavaKind kind = JavaKind.fromPrimitiveOrVoidTypeChar(name.charAt(0));
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9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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136 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(kind.toJavaClass());
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137 }
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138 return HotSpotUnresolvedJavaType.create(runtime, name);
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139 }
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140
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141 @Override
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142 public JavaType getParameterType(int index, ResolvedJavaType accessingClass) {
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143 if (accessingClass == null) {
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144 // Caller doesn't care about resolution context so return an unresolved
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145 // or primitive type (primitive type resolution is context free)
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146 return getUnresolvedOrPrimitiveType(runtime, parameters.get(index));
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147 }
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148 if (parameterTypes == null) {
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149 parameterTypes = new ResolvedJavaType[parameters.size()];
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150 }
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151
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152 ResolvedJavaType type = parameterTypes[index];
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153 if (!checkValidCache(type, accessingClass)) {
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154 JavaType result = runtime.lookupType(parameters.get(index), (HotSpotResolvedObjectType) accessingClass, false);
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155 if (result instanceof ResolvedJavaType) {
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156 type = (ResolvedJavaType) result;
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157 parameterTypes[index] = type;
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158 } else {
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159 return result;
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160 }
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161 }
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162 return type;
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163 }
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164
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165 @Override
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166 public String toMethodDescriptor() {
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167 assert originalString.equals(Signature.super.toMethodDescriptor());
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168 return originalString;
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169 }
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170
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171 @Override
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172 public JavaKind getReturnKind() {
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173 return JavaKind.fromTypeString(returnType);
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174 }
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175
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176 @Override
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177 public JavaType getReturnType(ResolvedJavaType accessingClass) {
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178 if (accessingClass == null) {
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179 // Caller doesn't care about resolution context so return an unresolved
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180 // or primitive type (primitive type resolution is context free)
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181 return getUnresolvedOrPrimitiveType(runtime, returnType);
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182 }
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183 if (!checkValidCache(returnTypeCache, accessingClass)) {
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184 JavaType result = runtime.lookupType(returnType, (HotSpotResolvedObjectType) accessingClass, false);
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185 if (result instanceof ResolvedJavaType) {
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186 returnTypeCache = (ResolvedJavaType) result;
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187 } else {
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188 return result;
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189 }
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190 }
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191 return returnTypeCache;
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192 }
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193
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194 @Override
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195 public String toString() {
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196 return "HotSpotSignature<" + originalString + ">";
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197 }
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198
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199 @Override
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200 public boolean equals(Object obj) {
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201 if (obj instanceof HotSpotSignature) {
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202 HotSpotSignature other = (HotSpotSignature) obj;
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203 if (other.originalString.equals(originalString)) {
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204 assert other.parameters.equals(parameters);
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diff changeset
205 assert other.returnType.equals(returnType);
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206 return true;
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207 }
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diff changeset
208 }
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diff changeset
209 return false;
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210 }
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diff changeset
211
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diff changeset
212 @Override
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diff changeset
213 public int hashCode() {
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diff changeset
214 return originalString.hashCode();
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diff changeset
215 }
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216 }