Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotConstantReflectionProvider.java @ 22679:4688478ecb7b
Make space in frame for native callee to spill outgoing parameters
author | Stefan Anzinger <stefan.anzinger@oracle.com> |
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date | Tue, 13 Oct 2015 17:07:59 +0200 |
parents | 1bbd4a7c274b |
children | f4c4cc22a31c |
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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 static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayBaseOffset; |
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26 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayIndexScale; |
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27 |
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28 import java.lang.reflect.Array; |
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29 |
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30 import jdk.vm.ci.meta.Constant; |
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31 import jdk.vm.ci.meta.ConstantReflectionProvider; |
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32 import jdk.vm.ci.meta.JavaConstant; |
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33 import jdk.vm.ci.meta.JavaField; |
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34 import jdk.vm.ci.meta.JavaKind; |
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35 import jdk.vm.ci.meta.JavaType; |
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36 import jdk.vm.ci.meta.MemoryAccessProvider; |
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37 import jdk.vm.ci.meta.MethodHandleAccessProvider; |
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38 import jdk.vm.ci.meta.ResolvedJavaType; |
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39 import jdk.vm.ci.options.Option; |
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40 import jdk.vm.ci.options.OptionType; |
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41 import jdk.vm.ci.options.OptionValue; |
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42 import jdk.vm.ci.options.StableOptionValue; |
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43 |
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44 /** |
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45 * HotSpot implementation of {@link ConstantReflectionProvider}. |
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46 */ |
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47 public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider, HotSpotProxified { |
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48 |
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49 static class Options { |
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50 //@formatter:off |
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51 @Option(help = "Constant fold final fields with default values.", type = OptionType.Debug) |
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52 public static final OptionValue<Boolean> TrustFinalDefaultFields = new OptionValue<>(true); |
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53 //@formatter:on |
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54 } |
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55 |
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56 protected final HotSpotJVMCIRuntimeProvider runtime; |
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57 protected final HotSpotMethodHandleAccessProvider methodHandleAccess; |
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58 protected final HotSpotMemoryAccessProviderImpl memoryAccess; |
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59 |
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60 public HotSpotConstantReflectionProvider(HotSpotJVMCIRuntimeProvider runtime) { |
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61 this.runtime = runtime; |
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62 this.methodHandleAccess = new HotSpotMethodHandleAccessProvider(this); |
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63 this.memoryAccess = new HotSpotMemoryAccessProviderImpl(runtime); |
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64 } |
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65 |
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66 public MethodHandleAccessProvider getMethodHandleAccess() { |
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67 return methodHandleAccess; |
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68 } |
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69 |
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70 @Override |
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71 public MemoryAccessProvider getMemoryAccessProvider() { |
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72 return memoryAccess; |
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73 } |
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74 |
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75 @Override |
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76 public Boolean constantEquals(Constant x, Constant y) { |
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77 if (x == y) { |
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78 return true; |
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79 } else if (x instanceof HotSpotObjectConstantImpl) { |
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80 return y instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) x).object() == ((HotSpotObjectConstantImpl) y).object(); |
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81 } else { |
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82 return x.equals(y); |
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83 } |
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84 } |
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85 |
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86 @Override |
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87 public Integer readArrayLength(JavaConstant array) { |
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88 if (array.getJavaKind() != JavaKind.Object || array.isNull()) { |
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89 return null; |
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90 } |
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91 |
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92 Object arrayObject = ((HotSpotObjectConstantImpl) array).object(); |
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93 if (!arrayObject.getClass().isArray()) { |
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94 return null; |
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95 } |
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96 return Array.getLength(arrayObject); |
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97 } |
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98 |
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99 public JavaConstant readConstantArrayElement(JavaConstant array, int index) { |
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100 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) { |
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101 JavaConstant element = readArrayElement(array, index); |
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102 if (element != null && (((HotSpotObjectConstantImpl) array).isDefaultStable() || !element.isDefaultForKind())) { |
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103 return element; |
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104 } |
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105 } |
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106 return null; |
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107 } |
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108 |
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109 /** |
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110 * Try to convert {@code offset} into an an index into {@code array}. |
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111 * |
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112 * @return the computed index or -1 if the offset isn't within the array |
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113 */ |
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114 private int indexForOffset(JavaConstant array, long offset) { |
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115 if (array.getJavaKind() != JavaKind.Object || array.isNull()) { |
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116 return -1; |
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117 } |
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118 Class<?> componentType = ((HotSpotObjectConstantImpl) array).object().getClass().getComponentType(); |
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119 JavaKind kind = runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(componentType).getJavaKind(); |
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120 int arraybase = getArrayBaseOffset(kind); |
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121 int scale = getArrayIndexScale(kind); |
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122 if (offset < arraybase) { |
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123 return -1; |
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124 } |
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125 long index = offset - arraybase; |
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126 if (index % scale != 0) { |
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127 return -1; |
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128 } |
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129 long result = index / scale; |
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130 if (result >= Integer.MAX_VALUE) { |
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131 return -1; |
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132 } |
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133 return (int) result; |
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134 } |
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135 |
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136 public JavaConstant readConstantArrayElementForOffset(JavaConstant array, long offset) { |
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137 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) { |
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138 return readConstantArrayElement(array, indexForOffset(array, offset)); |
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139 } |
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140 return null; |
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141 } |
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142 |
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143 @Override |
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144 public JavaConstant readArrayElement(JavaConstant array, int index) { |
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145 if (array.getJavaKind() != JavaKind.Object || array.isNull()) { |
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146 return null; |
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147 } |
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148 Object a = ((HotSpotObjectConstantImpl) array).object(); |
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149 |
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150 if (index < 0 || index >= Array.getLength(a)) { |
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151 return null; |
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152 } |
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153 |
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154 if (a instanceof Object[]) { |
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155 Object element = ((Object[]) a)[index]; |
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156 if (((HotSpotObjectConstantImpl) array).getStableDimension() > 1) { |
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157 return HotSpotObjectConstantImpl.forStableArray(element, ((HotSpotObjectConstantImpl) array).getStableDimension() - 1, ((HotSpotObjectConstantImpl) array).isDefaultStable()); |
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158 } else { |
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159 return HotSpotObjectConstantImpl.forObject(element); |
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160 } |
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161 } else { |
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162 return JavaConstant.forBoxedPrimitive(Array.get(a, index)); |
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163 } |
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164 } |
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165 |
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166 /** |
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167 * Check if the constant is a boxed value that is guaranteed to be cached by the platform. |
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168 * Otherwise the generated code might be the only reference to the boxed value and since object |
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169 * references from nmethods are weak this can cause GC problems. |
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170 * |
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171 * @param source |
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172 * @return true if the box is cached |
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173 */ |
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174 private static boolean isBoxCached(JavaConstant source) { |
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175 switch (source.getJavaKind()) { |
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176 case Boolean: |
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177 return true; |
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178 case Char: |
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179 return source.asInt() <= 127; |
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180 case Byte: |
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181 case Short: |
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182 case Int: |
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183 return source.asInt() >= -128 && source.asInt() <= 127; |
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184 case Long: |
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185 return source.asLong() >= -128 && source.asLong() <= 127; |
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186 case Float: |
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187 case Double: |
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188 return false; |
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189 default: |
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190 throw new IllegalArgumentException("unexpected kind " + source.getJavaKind()); |
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191 } |
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192 } |
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193 |
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194 @Override |
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195 public JavaConstant boxPrimitive(JavaConstant source) { |
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196 if (!source.getJavaKind().isPrimitive() || !isBoxCached(source)) { |
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197 return null; |
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198 } |
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199 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive()); |
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200 } |
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201 |
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202 @Override |
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203 public JavaConstant unboxPrimitive(JavaConstant source) { |
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204 if (!source.getJavaKind().isObject()) { |
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205 return null; |
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206 } |
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207 if (source.isNull()) { |
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208 return null; |
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209 } |
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210 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object()); |
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211 } |
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212 |
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213 public JavaConstant forString(String value) { |
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214 return HotSpotObjectConstantImpl.forObject(value); |
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215 } |
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216 |
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217 public JavaConstant forObject(Object value) { |
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218 return HotSpotObjectConstantImpl.forObject(value); |
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219 } |
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220 |
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221 @Override |
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222 public ResolvedJavaType asJavaType(Constant constant) { |
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223 if (constant instanceof HotSpotObjectConstant) { |
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224 Object obj = ((HotSpotObjectConstantImpl) constant).object(); |
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225 if (obj instanceof Class) { |
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226 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj); |
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227 } |
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228 } |
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229 if (constant instanceof HotSpotMetaspaceConstant) { |
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230 MetaspaceWrapperObject obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant); |
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231 if (obj instanceof HotSpotResolvedObjectTypeImpl) { |
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232 return (ResolvedJavaType) obj; |
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233 } |
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234 } |
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235 return null; |
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236 } |
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237 |
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238 private static final String SystemClassName = "Ljava/lang/System;"; |
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239 |
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240 /** |
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241 * Determines if a static field is constant for the purpose of |
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242 * {@link #readConstantFieldValue(JavaField, JavaConstant)}. |
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243 */ |
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244 protected boolean isStaticFieldConstant(HotSpotResolvedJavaField staticField) { |
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245 if (staticField.isFinal() || staticField.isStable()) { |
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246 ResolvedJavaType holder = staticField.getDeclaringClass(); |
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247 if (holder.isInitialized() && !holder.getName().equals(SystemClassName)) { |
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248 return true; |
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249 } |
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250 } |
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251 return false; |
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252 } |
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253 |
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254 /** |
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255 * Determines if a value read from a {@code final} instance field is considered constant. The |
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256 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is |
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257 * not the {@link JavaConstant#isDefaultForKind default value} for its kind or if |
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258 * {@link Options#TrustFinalDefaultFields} is true. |
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259 * |
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260 * @param value a value read from a {@code final} instance field |
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261 * @param receiverClass the {@link Object#getClass() class} of object from which the |
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262 * {@code value} was read |
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263 */ |
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264 protected boolean isFinalInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) { |
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265 return !value.isDefaultForKind() || Options.TrustFinalDefaultFields.getValue(); |
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266 } |
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267 |
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268 /** |
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269 * Determines if a value read from a {@link Stable} instance field is considered constant. The |
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270 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is |
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271 * not the {@link JavaConstant#isDefaultForKind default value} for its kind. |
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272 * |
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273 * @param value a value read from a {@link Stable} field |
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274 * @param receiverClass the {@link Object#getClass() class} of object from which the |
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275 * {@code value} was read |
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276 */ |
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277 protected boolean isStableInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) { |
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278 return !value.isDefaultForKind(); |
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279 } |
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280 |
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281 /** |
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282 * {@inheritDoc} |
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283 * <p> |
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284 * The {@code value} field in {@link OptionValue} is considered constant if the type of |
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285 * {@code receiver} is (assignable to) {@link StableOptionValue}. |
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286 */ |
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287 public JavaConstant readConstantFieldValue(JavaField field, JavaConstant receiver) { |
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288 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; |
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289 |
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290 if (hotspotField.isStatic()) { |
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291 if (isStaticFieldConstant(hotspotField)) { |
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292 JavaConstant value = readFieldValue(field, receiver); |
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293 if (hotspotField.isFinal() || !value.isDefaultForKind()) { |
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294 return value; |
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295 } |
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296 } |
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297 } else { |
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298 /* |
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299 * for non-static final fields, we must assume that they are only initialized if they |
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300 * have a non-default value. |
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301 */ |
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302 Object object = receiver.isNull() ? null : ((HotSpotObjectConstantImpl) receiver).object(); |
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303 |
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304 // Canonicalization may attempt to process an unsafe read before |
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305 // processing a guard (e.g. a null check or a type check) for this read |
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306 // so we need to check the object being read |
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307 if (object != null) { |
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308 if (hotspotField.isFinal()) { |
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309 if (hotspotField.isInObject(object)) { |
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310 JavaConstant value = readFieldValue(field, receiver); |
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311 if (isFinalInstanceFieldValueConstant(value, object.getClass())) { |
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312 return value; |
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313 } |
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314 } |
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315 } else if (hotspotField.isStable()) { |
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316 if (hotspotField.isInObject(object)) { |
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317 JavaConstant value = readFieldValue(field, receiver); |
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318 if (isStableInstanceFieldValueConstant(value, object.getClass())) { |
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319 return value; |
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320 } |
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321 } |
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322 } else { |
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323 Class<?> clazz = object.getClass(); |
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324 if (StableOptionValue.class.isAssignableFrom(clazz)) { |
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325 if (hotspotField.isInObject(object) && hotspotField.getName().equals("value")) { |
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326 StableOptionValue<?> option = (StableOptionValue<?>) object; |
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327 return HotSpotObjectConstantImpl.forObject(option.getValue()); |
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328 } |
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329 } |
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330 } |
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331 } |
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332 } |
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333 return null; |
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334 } |
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335 |
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336 public JavaConstant readFieldValue(JavaField field, JavaConstant receiver) { |
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337 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; |
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338 if (!hotspotField.isStable()) { |
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339 return readNonStableFieldValue(field, receiver); |
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340 } else { |
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341 return readStableFieldValue(field, receiver, hotspotField.isDefaultStable()); |
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342 } |
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343 } |
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344 |
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345 private JavaConstant readNonStableFieldValue(JavaField field, JavaConstant receiver) { |
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346 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field; |
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347 if (hotspotField.isStatic()) { |
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348 HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass(); |
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349 if (holder.isInitialized()) { |
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350 return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), HotSpotObjectConstantImpl.forObject(holder.mirror()), hotspotField.offset()); |
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351 } |
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352 } else { |
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353 if (receiver.isNonNull() && hotspotField.isInObject(((HotSpotObjectConstantImpl) receiver).object())) { |
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354 return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), receiver, hotspotField.offset()); |
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355 } |
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356 } |
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357 return null; |
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358 } |
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359 |
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360 public JavaConstant readStableFieldValue(JavaField field, JavaConstant receiver, boolean isDefaultStable) { |
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361 JavaConstant fieldValue = readNonStableFieldValue(field, receiver); |
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362 if (fieldValue.isNonNull()) { |
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363 JavaType declaredType = field.getType(); |
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364 if (declaredType.getComponentType() != null) { |
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365 int stableDimension = getArrayDimension(declaredType); |
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366 return HotSpotObjectConstantImpl.forStableArray(((HotSpotObjectConstantImpl) fieldValue).object(), stableDimension, isDefaultStable); |
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367 } |
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368 } |
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369 return fieldValue; |
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370 } |
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371 |
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372 private static int getArrayDimension(JavaType type) { |
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373 int dimensions = 0; |
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374 JavaType componentType = type; |
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375 while ((componentType = componentType.getComponentType()) != null) { |
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376 dimensions++; |
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377 } |
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378 return dimensions; |
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379 } |
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380 } |