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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotConstantReflectionProvider.java @ 22672:1bbd4a7c274b

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Rename jdk.internal.jvmci to jdk.vm.ci
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Thu, 08 Oct 2015 17:28:41 -0700
parents jvmci/jdk.internal.jvmci.hotspot/src/jdk/internal/jvmci/hotspot/HotSpotConstantReflectionProvider.java@47f047ae2b4b
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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28 import java.lang.reflect.Array;
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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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diff changeset
126 if (index % scale != 0) {
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127 return -1;
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128 }
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diff changeset
129 long result = index / scale;
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diff changeset
130 if (result >= Integer.MAX_VALUE) {
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diff changeset
131 return -1;
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132 }
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133 return (int) result;
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diff changeset
134 }
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diff changeset
135
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diff changeset
136 public JavaConstant readConstantArrayElementForOffset(JavaConstant array, long offset) {
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diff changeset
137 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) {
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diff changeset
138 return readConstantArrayElement(array, indexForOffset(array, offset));
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diff changeset
139 }
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diff changeset
140 return null;
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parents: 21377
diff changeset
141 }
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diff changeset
142
15023
652564fe42d5 Use CompressionNode for accessing compressed Klass pointers.
Roland Schatz <roland.schatz@oracle.com>
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diff changeset
143 @Override
18187
9619ba4daf4c Rename Constant to JavaConstant.
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144 public JavaConstant readArrayElement(JavaConstant array, int index) {
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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145 if (array.getJavaKind() != JavaKind.Object || array.isNull()) {
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146 return null;
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diff changeset
147 }
18290
e7d219e9d01f removed HotSpotObjectConstantImpl.asObject()
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diff changeset
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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diff changeset
151 return null;
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152 }
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153
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154 if (a instanceof Object[]) {
18472
de179c27cad3 Add support for stable array constants
Andreas Woess <andreas.woess@jku.at>
parents: 18471
diff changeset
155 Object element = ((Object[]) a)[index];
de179c27cad3 Add support for stable array constants
Andreas Woess <andreas.woess@jku.at>
parents: 18471
diff changeset
156 if (((HotSpotObjectConstantImpl) array).getStableDimension() > 1) {
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parents: 18471
diff changeset
157 return HotSpotObjectConstantImpl.forStableArray(element, ((HotSpotObjectConstantImpl) array).getStableDimension() - 1, ((HotSpotObjectConstantImpl) array).isDefaultStable());
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diff changeset
158 } else {
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diff changeset
159 return HotSpotObjectConstantImpl.forObject(element);
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parents: 18471
diff changeset
160 }
15018
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diff changeset
161 } else {
18187
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diff changeset
162 return JavaConstant.forBoxedPrimitive(Array.get(a, index));
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163 }
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diff changeset
164 }
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165
18801
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diff changeset
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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diff changeset
169 * references from nmethods are weak this can cause GC problems.
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170 *
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diff changeset
171 * @param source
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172 * @return true if the box is cached
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diff changeset
173 */
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diff changeset
174 private static boolean isBoxCached(JavaConstant source) {
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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diff changeset
175 switch (source.getJavaKind()) {
18801
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diff changeset
176 case Boolean:
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diff changeset
177 return true;
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diff changeset
178 case Char:
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179 return source.asInt() <= 127;
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diff changeset
180 case Byte:
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diff changeset
181 case Short:
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diff changeset
182 case Int:
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diff changeset
183 return source.asInt() >= -128 && source.asInt() <= 127;
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diff changeset
184 case Long:
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diff changeset
185 return source.asLong() >= -128 && source.asLong() <= 127;
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diff changeset
186 case Float:
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diff changeset
187 case Double:
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diff changeset
188 return false;
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diff changeset
189 default:
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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diff changeset
190 throw new IllegalArgumentException("unexpected kind " + source.getJavaKind());
18801
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diff changeset
191 }
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parents: 18686
diff changeset
192 }
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diff changeset
193
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diff changeset
194 @Override
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9619ba4daf4c Rename Constant to JavaConstant.
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diff changeset
195 public JavaConstant boxPrimitive(JavaConstant source) {
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diff changeset
196 if (!source.getJavaKind().isPrimitive() || !isBoxCached(source)) {
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diff changeset
197 return null;
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diff changeset
198 }
18262
f7d45e2426d4 converted HotSpotObjectConstant to an interface
Doug Simon <doug.simon@oracle.com>
parents: 18223
diff changeset
199 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive());
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diff changeset
200 }
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diff changeset
201
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
202 @Override
18187
9619ba4daf4c Rename Constant to JavaConstant.
Roland Schatz <roland.schatz@oracle.com>
parents: 18176
diff changeset
203 public JavaConstant unboxPrimitive(JavaConstant source) {
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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parents: 22054
diff changeset
204 if (!source.getJavaKind().isObject()) {
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parents: 13488
diff changeset
205 return null;
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parents: 13488
diff changeset
206 }
18293
ab8fbaa5e72f fixed minor regressions after removing HotSpotObjectConstantImpl.asObject()
Doug Simon <doug.simon@oracle.com>
parents: 18290
diff changeset
207 if (source.isNull()) {
ab8fbaa5e72f fixed minor regressions after removing HotSpotObjectConstantImpl.asObject()
Doug Simon <doug.simon@oracle.com>
parents: 18290
diff changeset
208 return null;
ab8fbaa5e72f fixed minor regressions after removing HotSpotObjectConstantImpl.asObject()
Doug Simon <doug.simon@oracle.com>
parents: 18290
diff changeset
209 }
18290
e7d219e9d01f removed HotSpotObjectConstantImpl.asObject()
Doug Simon <doug.simon@oracle.com>
parents: 18266
diff changeset
210 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object());
15018
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
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parents: 13488
diff changeset
211 }
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13488
diff changeset
212
18295
17bf458cf86e reduced use of HotSpotObjectConstantImpl.forObject
Doug Simon <doug.simon@oracle.com>
parents: 18293
diff changeset
213 public JavaConstant forString(String value) {
17bf458cf86e reduced use of HotSpotObjectConstantImpl.forObject
Doug Simon <doug.simon@oracle.com>
parents: 18293
diff changeset
214 return HotSpotObjectConstantImpl.forObject(value);
17bf458cf86e reduced use of HotSpotObjectConstantImpl.forObject
Doug Simon <doug.simon@oracle.com>
parents: 18293
diff changeset
215 }
17bf458cf86e reduced use of HotSpotObjectConstantImpl.forObject
Doug Simon <doug.simon@oracle.com>
parents: 18293
diff changeset
216
22645
c33f0cb02b34 Add ConstantReflectionProvider.forObject method and make HotSpotObjectConstantImpl package-private.
Roland Schatz <roland.schatz@oracle.com>
parents: 22590
diff changeset
217 public JavaConstant forObject(Object value) {
c33f0cb02b34 Add ConstantReflectionProvider.forObject method and make HotSpotObjectConstantImpl package-private.
Roland Schatz <roland.schatz@oracle.com>
parents: 22590
diff changeset
218 return HotSpotObjectConstantImpl.forObject(value);
c33f0cb02b34 Add ConstantReflectionProvider.forObject method and make HotSpotObjectConstantImpl package-private.
Roland Schatz <roland.schatz@oracle.com>
parents: 22590
diff changeset
219 }
c33f0cb02b34 Add ConstantReflectionProvider.forObject method and make HotSpotObjectConstantImpl package-private.
Roland Schatz <roland.schatz@oracle.com>
parents: 22590
diff changeset
220
15018
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
221 @Override
18487
0f4813e0b4a9 Use asConstant() instead of asJavaConstant() where possible.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
222 public ResolvedJavaType asJavaType(Constant constant) {
15909
e43591136d9f Support for compressed constants.
Roland Schatz <roland.schatz@oracle.com>
parents: 15291
diff changeset
223 if (constant instanceof HotSpotObjectConstant) {
18290
e7d219e9d01f removed HotSpotObjectConstantImpl.asObject()
Doug Simon <doug.simon@oracle.com>
parents: 18266
diff changeset
224 Object obj = ((HotSpotObjectConstantImpl) constant).object();
15018
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13488
diff changeset
225 if (obj instanceof Class) {
21552
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
Doug Simon <doug.simon@oracle.com>
parents: 21459
diff changeset
226 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj);
15018
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parents: 13488
diff changeset
227 }
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13488
diff changeset
228 }
16183
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
229 if (constant instanceof HotSpotMetaspaceConstant) {
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
Roland Schatz <roland.schatz@oracle.com>
parents: 22555
diff changeset
230 MetaspaceWrapperObject obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant);
18223
17c98fad6980 converted HotSpotResolvedObjectType to an interface
Doug Simon <doug.simon@oracle.com>
parents: 18188
diff changeset
231 if (obj instanceof HotSpotResolvedObjectTypeImpl) {
16183
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
232 return (ResolvedJavaType) obj;
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
233 }
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
234 }
15018
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Christian Wimmer <christian.wimmer@oracle.com>
parents: 13488
diff changeset
235 return null;
db4254246f9a Remove Constant.forObject and Constant.asObject to improve compiler/VM separation
Christian Wimmer <christian.wimmer@oracle.com>
parents: 13488
diff changeset
236 }
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
237
21552
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parents: 21459
diff changeset
238 private static final String SystemClassName = "Ljava/lang/System;";
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diff changeset
239
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
Doug Simon <doug.simon@oracle.com>
parents: 21459
diff changeset
240 /**
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parents: 21459
diff changeset
241 * Determines if a static field is constant for the purpose of
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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parents: 21459
diff changeset
242 * {@link #readConstantFieldValue(JavaField, JavaConstant)}.
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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parents: 21459
diff changeset
243 */
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diff changeset
244 protected boolean isStaticFieldConstant(HotSpotResolvedJavaField staticField) {
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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parents: 21459
diff changeset
245 if (staticField.isFinal() || staticField.isStable()) {
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
Doug Simon <doug.simon@oracle.com>
parents: 21459
diff changeset
246 ResolvedJavaType holder = staticField.getDeclaringClass();
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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parents: 21459
diff changeset
247 if (holder.isInitialized() && !holder.getName().equals(SystemClassName)) {
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
Doug Simon <doug.simon@oracle.com>
parents: 21459
diff changeset
248 return true;
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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parents: 21459
diff changeset
249 }
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
Doug Simon <doug.simon@oracle.com>
parents: 21459
diff changeset
250 }
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
Doug Simon <doug.simon@oracle.com>
parents: 21459
diff changeset
251 return false;
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diff changeset
252 }
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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diff changeset
253
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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parents: 21459
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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 }
18472
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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 }