Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotConstantReflectionProvider.java @ 21554:b1530a6cce8c
renamed com.oracle.graal.[debug|options|hotspotvmconfig]* modules to com.oracle.jvmci.[debug|options|hotspotvmconfig]* modules (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 26 May 2015 23:21:15 +0200 |
parents | 9579a3c62a9e |
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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.jvmci.hotspot; |
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24 |
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25 import static com.oracle.jvmci.hotspot.HotSpotConstantReflectionProvider.Options.*; |
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26 |
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27 import java.lang.reflect.*; |
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28 |
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29 import com.oracle.graal.api.meta.*; |
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30 import com.oracle.jvmci.options.*; |
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31 |
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32 /** |
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33 * HotSpot implementation of {@link ConstantReflectionProvider}. |
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34 */ |
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35 public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider, HotSpotProxified { |
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36 |
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37 static class Options { |
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38 //@formatter:off |
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39 @Option(help = "Constant fold final fields with default values.", type = OptionType.Debug) |
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40 public static final OptionValue<Boolean> TrustFinalDefaultFields = new OptionValue<>(true); |
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41 //@formatter:on |
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42 } |
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43 |
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44 protected final HotSpotJVMCIRuntimeProvider runtime; |
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45 protected final HotSpotMethodHandleAccessProvider methodHandleAccess; |
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46 protected final HotSpotMemoryAccessProviderImpl memoryAccess; |
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47 |
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48 public HotSpotConstantReflectionProvider(HotSpotJVMCIRuntimeProvider runtime) { |
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49 this.runtime = runtime; |
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50 this.methodHandleAccess = new HotSpotMethodHandleAccessProvider(this); |
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51 this.memoryAccess = new HotSpotMemoryAccessProviderImpl(runtime); |
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52 } |
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53 |
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54 public MethodHandleAccessProvider getMethodHandleAccess() { |
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55 return methodHandleAccess; |
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56 } |
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57 |
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58 @Override |
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59 public MemoryAccessProvider getMemoryAccessProvider() { |
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60 return memoryAccess; |
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61 } |
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62 |
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63 @Override |
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64 public Boolean constantEquals(Constant x, Constant y) { |
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65 if (x == y) { |
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66 return true; |
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67 } else if (x instanceof HotSpotObjectConstantImpl) { |
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68 return y instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) x).object() == ((HotSpotObjectConstantImpl) y).object(); |
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69 } else { |
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70 return x.equals(y); |
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71 } |
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72 } |
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73 |
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74 @Override |
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75 public Integer readArrayLength(JavaConstant array) { |
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76 if (array.getKind() != Kind.Object || array.isNull()) { |
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77 return null; |
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78 } |
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79 |
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80 Object arrayObject = ((HotSpotObjectConstantImpl) array).object(); |
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81 if (!arrayObject.getClass().isArray()) { |
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82 return null; |
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83 } |
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84 return Array.getLength(arrayObject); |
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85 } |
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86 |
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87 public JavaConstant readConstantArrayElement(JavaConstant array, int index) { |
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88 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) { |
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89 JavaConstant element = readArrayElement(array, index); |
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90 if (element != null && (((HotSpotObjectConstantImpl) array).isDefaultStable() || !element.isDefaultForKind())) { |
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91 return element; |
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92 } |
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93 } |
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94 return null; |
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95 } |
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96 |
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97 /** |
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98 * Try to convert {@code offset} into an an index into {@code array}. |
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99 * |
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100 * @return -1 if the offset isn't within the array or the computed index |
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101 */ |
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102 private int indexForOffset(JavaConstant array, long offset) { |
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103 if (array.getKind() != Kind.Object || array.isNull()) { |
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104 return -1; |
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105 } |
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106 Class<?> componentType = ((HotSpotObjectConstantImpl) array).object().getClass().getComponentType(); |
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107 Kind kind = runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(componentType).getKind(); |
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108 int arraybase = runtime.getArrayBaseOffset(kind); |
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109 int scale = runtime.getArrayIndexScale(kind); |
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110 if (offset < arraybase) { |
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111 return -1; |
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112 } |
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113 long index = offset - arraybase; |
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114 if (index % scale != 0) { |
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115 return -1; |
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116 } |
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117 long result = index / scale; |
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118 if (result >= Integer.MAX_VALUE) { |
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119 return -1; |
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120 } |
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121 return (int) result; |
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122 } |
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123 |
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124 public JavaConstant readConstantArrayElementForOffset(JavaConstant array, long offset) { |
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125 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) { |
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126 return readConstantArrayElement(array, indexForOffset(array, offset)); |
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127 } |
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128 return null; |
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129 } |
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130 |
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131 @Override |
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132 public JavaConstant readArrayElement(JavaConstant array, int index) { |
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133 if (array.getKind() != Kind.Object || array.isNull()) { |
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134 return null; |
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135 } |
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136 Object a = ((HotSpotObjectConstantImpl) array).object(); |
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137 |
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138 if (index < 0 || index >= Array.getLength(a)) { |
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139 return null; |
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140 } |
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141 |
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142 if (a instanceof Object[]) { |
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143 Object element = ((Object[]) a)[index]; |
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144 if (((HotSpotObjectConstantImpl) array).getStableDimension() > 1) { |
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145 return HotSpotObjectConstantImpl.forStableArray(element, ((HotSpotObjectConstantImpl) array).getStableDimension() - 1, ((HotSpotObjectConstantImpl) array).isDefaultStable()); |
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146 } else { |
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147 return HotSpotObjectConstantImpl.forObject(element); |
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148 } |
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149 } else { |
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150 return JavaConstant.forBoxedPrimitive(Array.get(a, index)); |
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151 } |
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152 } |
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153 |
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154 /** |
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155 * Check if the constant is a boxed value that is guaranteed to be cached by the platform. |
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156 * Otherwise the generated code might be the only reference to the boxed value and since object |
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157 * references from nmethods are weak this can cause GC problems. |
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158 * |
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159 * @param source |
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160 * @return true if the box is cached |
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161 */ |
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162 private static boolean isBoxCached(JavaConstant source) { |
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163 switch (source.getKind()) { |
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164 case Boolean: |
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165 return true; |
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166 case Char: |
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167 return source.asInt() <= 127; |
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168 case Byte: |
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169 case Short: |
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170 case Int: |
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171 return source.asInt() >= -128 && source.asInt() <= 127; |
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172 case Long: |
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173 return source.asLong() >= -128 && source.asLong() <= 127; |
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174 case Float: |
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175 case Double: |
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176 return false; |
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177 default: |
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178 throw new IllegalArgumentException("unexpected kind " + source.getKind()); |
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179 } |
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180 } |
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181 |
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182 @Override |
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183 public JavaConstant boxPrimitive(JavaConstant source) { |
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184 if (!source.getKind().isPrimitive() || !isBoxCached(source)) { |
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185 return null; |
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186 } |
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187 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive()); |
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188 } |
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189 |
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190 @Override |
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191 public JavaConstant unboxPrimitive(JavaConstant source) { |
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192 if (!source.getKind().isObject()) { |
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193 return null; |
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194 } |
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195 if (source.isNull()) { |
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196 return null; |
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197 } |
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198 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object()); |
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199 } |
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200 |
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201 public JavaConstant forString(String value) { |
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202 return HotSpotObjectConstantImpl.forObject(value); |
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203 } |
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204 |
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205 @Override |
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206 public ResolvedJavaType asJavaType(Constant constant) { |
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207 if (constant instanceof HotSpotObjectConstant) { |
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208 Object obj = ((HotSpotObjectConstantImpl) constant).object(); |
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209 if (obj instanceof Class) { |
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210 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj); |
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211 } |
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212 } |
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213 if (constant instanceof HotSpotMetaspaceConstant) { |
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214 Object obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant); |
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215 if (obj instanceof HotSpotResolvedObjectTypeImpl) { |
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216 return (ResolvedJavaType) obj; |
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217 } |
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218 } |
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219 return null; |
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220 } |
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221 |
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222 private static final String SystemClassName = "Ljava/lang/System;"; |
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223 |
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224 /** |
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225 * Determines if a static field is constant for the purpose of |
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226 * {@link #readConstantFieldValue(JavaField, JavaConstant)}. |
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227 */ |
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228 protected boolean isStaticFieldConstant(HotSpotResolvedJavaField staticField) { |
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229 if (staticField.isFinal() || staticField.isStable()) { |
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230 ResolvedJavaType holder = staticField.getDeclaringClass(); |
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231 if (holder.isInitialized() && !holder.getName().equals(SystemClassName)) { |
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232 return true; |
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233 } |
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234 } |
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235 return false; |
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236 } |
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237 |
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238 /** |
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239 * Determines if a value read from a {@code final} instance field is considered constant. The |
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240 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is |
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241 * not the {@link JavaConstant#isDefaultForKind default value} for its kind or if |
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242 * {@link Options#TrustFinalDefaultFields} is true. |
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243 * |
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244 * @param value a value read from a {@code final} instance field |
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245 * @param receiverClass the {@link Object#getClass() class} of object from which the |
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246 * {@code value} was read |
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247 */ |
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248 protected boolean isFinalInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) { |
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249 return !value.isDefaultForKind() || TrustFinalDefaultFields.getValue(); |
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250 } |
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251 |
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252 /** |
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253 * Determines if a value read from a {@link Stable} instance field is considered constant. The |
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254 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is |
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255 * not the {@link JavaConstant#isDefaultForKind default value} for its kind. |
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256 * |
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257 * @param value a value read from a {@link Stable} field |
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258 * @param receiverClass the {@link Object#getClass() class} of object from which the |
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259 * {@code value} was read |
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260 */ |
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261 protected boolean isStableInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) { |
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262 return !value.isDefaultForKind(); |
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263 } |
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264 |
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265 /** |
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266 * {@inheritDoc} |
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267 * <p> |
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268 * The {@code value} field in {@link OptionValue} is considered constant if the type of |
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269 * {@code receiver} is (assignable to) {@link StableOptionValue}. |
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270 */ |
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271 public JavaConstant readConstantFieldValue(JavaField field, JavaConstant receiver) { |
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272 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; |
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273 |
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274 if (hotspotField.isStatic()) { |
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275 if (isStaticFieldConstant(hotspotField)) { |
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276 JavaConstant value = readFieldValue(field, receiver); |
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277 if (hotspotField.isFinal() || !value.isDefaultForKind()) { |
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278 return value; |
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279 } |
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280 } |
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281 } else { |
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282 /* |
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283 * for non-static final fields, we must assume that they are only initialized if they |
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284 * have a non-default value. |
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285 */ |
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286 Object object = receiver.isNull() ? null : ((HotSpotObjectConstantImpl) receiver).object(); |
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287 |
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288 // Canonicalization may attempt to process an unsafe read before |
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289 // processing a guard (e.g. a null check or a type check) for this read |
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290 // so we need to check the object being read |
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291 if (object != null) { |
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292 if (hotspotField.isFinal()) { |
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293 if (hotspotField.isInObject(object)) { |
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294 JavaConstant value = readFieldValue(field, receiver); |
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295 if (isFinalInstanceFieldValueConstant(value, object.getClass())) { |
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296 return value; |
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297 } |
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298 } |
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299 } else if (hotspotField.isStable()) { |
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300 if (hotspotField.isInObject(object)) { |
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301 JavaConstant value = readFieldValue(field, receiver); |
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302 if (isStableInstanceFieldValueConstant(value, object.getClass())) { |
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303 return value; |
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304 } |
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305 } |
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306 } else { |
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307 Class<?> clazz = object.getClass(); |
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308 if (StableOptionValue.class.isAssignableFrom(clazz)) { |
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309 if (hotspotField.isInObject(object) && hotspotField.getName().equals("value")) { |
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310 StableOptionValue<?> option = (StableOptionValue<?>) object; |
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311 return HotSpotObjectConstantImpl.forObject(option.getValue()); |
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312 } |
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313 } |
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314 } |
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315 } |
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316 } |
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317 return null; |
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318 } |
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319 |
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320 public JavaConstant readFieldValue(JavaField field, JavaConstant receiver) { |
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321 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; |
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322 if (!hotspotField.isStable()) { |
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323 return readNonStableFieldValue(field, receiver); |
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324 } else { |
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325 return readStableFieldValue(field, receiver, false); |
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326 } |
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327 } |
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328 |
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329 private JavaConstant readNonStableFieldValue(JavaField field, JavaConstant receiver) { |
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330 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; |
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331 if (hotspotField.isStatic()) { |
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332 HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass(); |
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333 if (holder.isInitialized()) { |
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334 return memoryAccess.readUnsafeConstant(hotspotField.getKind(), HotSpotObjectConstantImpl.forObject(holder.mirror()), hotspotField.offset()); |
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335 } |
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336 } else { |
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337 if (receiver.isNonNull() && hotspotField.isInObject(((HotSpotObjectConstantImpl) receiver).object())) { |
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338 return memoryAccess.readUnsafeConstant(hotspotField.getKind(), receiver, hotspotField.offset()); |
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339 } |
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340 } |
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341 return null; |
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342 } |
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343 |
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344 public JavaConstant readStableFieldValue(JavaField field, JavaConstant receiver, boolean isDefaultStable) { |
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345 JavaConstant fieldValue = readNonStableFieldValue(field, receiver); |
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346 if (fieldValue.isNonNull()) { |
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347 JavaType declaredType = field.getType(); |
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348 if (declaredType.getComponentType() != null) { |
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349 int stableDimension = getArrayDimension(declaredType); |
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350 return HotSpotObjectConstantImpl.forStableArray(((HotSpotObjectConstantImpl) fieldValue).object(), stableDimension, isDefaultStable); |
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351 } |
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352 } |
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353 return fieldValue; |
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354 } |
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355 |
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356 private static int getArrayDimension(JavaType type) { |
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357 int dimensions = 0; |
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358 JavaType componentType = type; |
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359 while ((componentType = componentType.getComponentType()) != null) { |
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360 dimensions++; |
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361 } |
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362 return dimensions; |
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363 } |
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364 } |