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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotConstantReflectionProvider.java @ 23392:b3a816d3b844

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Backed out changeset: a920338dd4d4
author Doug Simon <doug.simon@oracle.com>
date Thu, 12 May 2016 11:06:49 +0200
parents a920338dd4d4
children 1d4ce2d19e52
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1 /*
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2 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.hotspot;
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24
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25 import java.lang.reflect.Array;
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26
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27 import jdk.vm.ci.common.JVMCIError;
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28 import jdk.vm.ci.meta.Constant;
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29 import jdk.vm.ci.meta.ConstantReflectionProvider;
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30 import jdk.vm.ci.meta.JavaConstant;
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31 import jdk.vm.ci.meta.JavaKind;
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32 import jdk.vm.ci.meta.MemoryAccessProvider;
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33 import jdk.vm.ci.meta.MethodHandleAccessProvider;
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34 import jdk.vm.ci.meta.ResolvedJavaField;
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35 import jdk.vm.ci.meta.ResolvedJavaType;
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36
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37 /**
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38 * HotSpot implementation of {@link ConstantReflectionProvider}.
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39 */
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40 public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider, HotSpotProxified {
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41
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42 protected final HotSpotJVMCIRuntimeProvider runtime;
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43 protected final HotSpotMethodHandleAccessProvider methodHandleAccess;
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44 protected final HotSpotMemoryAccessProviderImpl memoryAccess;
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45
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46 public HotSpotConstantReflectionProvider(HotSpotJVMCIRuntimeProvider runtime) {
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47 this.runtime = runtime;
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48 this.methodHandleAccess = new HotSpotMethodHandleAccessProvider(this);
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49 this.memoryAccess = new HotSpotMemoryAccessProviderImpl(runtime);
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50 }
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51
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52 public MethodHandleAccessProvider getMethodHandleAccess() {
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53 return methodHandleAccess;
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54 }
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55
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56 @Override
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57 public MemoryAccessProvider getMemoryAccessProvider() {
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58 return memoryAccess;
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59 }
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60
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61 @Override
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62 public Boolean constantEquals(Constant x, Constant y) {
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63 if (x == y) {
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64 return true;
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65 } else if (x instanceof HotSpotObjectConstantImpl) {
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66 return y instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) x).object() == ((HotSpotObjectConstantImpl) y).object();
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67 } else {
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68 return x.equals(y);
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69 }
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70 }
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71
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72 @Override
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73 public Integer readArrayLength(JavaConstant array) {
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74 if (array.getJavaKind() != JavaKind.Object || array.isNull()) {
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75 return null;
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76 }
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77
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78 Object arrayObject = ((HotSpotObjectConstantImpl) array).object();
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79 if (!arrayObject.getClass().isArray()) {
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80 return null;
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81 }
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82 return Array.getLength(arrayObject);
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83 }
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84
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85 @Override
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86 public JavaConstant readArrayElement(JavaConstant array, int index) {
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87 if (array.getJavaKind() != JavaKind.Object || array.isNull()) {
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88 return null;
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89 }
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90 Object a = ((HotSpotObjectConstantImpl) array).object();
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91
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92 if (index < 0 || index >= Array.getLength(a)) {
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93 return null;
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94 }
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95
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96 if (a instanceof Object[]) {
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97 Object element = ((Object[]) a)[index];
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98 return HotSpotObjectConstantImpl.forObject(element);
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99 } else {
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100 return JavaConstant.forBoxedPrimitive(Array.get(a, index));
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101 }
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102 }
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103
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104 /**
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105 * Check if the constant is a boxed value that is guaranteed to be cached by the platform.
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106 * Otherwise the generated code might be the only reference to the boxed value and since object
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107 * references from nmethods are weak this can cause GC problems.
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108 *
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109 * @param source
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110 * @return true if the box is cached
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111 */
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112 private static boolean isBoxCached(JavaConstant source) {
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113 switch (source.getJavaKind()) {
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114 case Boolean:
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115 return true;
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116 case Char:
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117 return source.asInt() <= 127;
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118 case Byte:
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119 case Short:
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120 case Int:
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121 return source.asInt() >= -128 && source.asInt() <= 127;
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122 case Long:
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123 return source.asLong() >= -128 && source.asLong() <= 127;
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124 case Float:
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125 case Double:
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126 return false;
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127 default:
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128 throw new IllegalArgumentException("unexpected kind " + source.getJavaKind());
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129 }
95249d5e794f Only embed boxed primitives when the box is cached by the JDK
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 18686
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130 }
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131
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132 @Override
18187
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133 public JavaConstant boxPrimitive(JavaConstant source) {
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134 if (!source.getJavaKind().isPrimitive() || !isBoxCached(source)) {
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135 return null;
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136 }
18262
f7d45e2426d4 converted HotSpotObjectConstant to an interface
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137 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive());
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138 }
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139
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140 @Override
18187
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141 public JavaConstant unboxPrimitive(JavaConstant source) {
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142 if (!source.getJavaKind().isObject()) {
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143 return null;
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144 }
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ab8fbaa5e72f fixed minor regressions after removing HotSpotObjectConstantImpl.asObject()
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145 if (source.isNull()) {
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146 return null;
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parents: 18290
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147 }
18290
e7d219e9d01f removed HotSpotObjectConstantImpl.asObject()
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148 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object());
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149 }
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150
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151 public JavaConstant forString(String value) {
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152 return HotSpotObjectConstantImpl.forObject(value);
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153 }
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154
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diff changeset
155 public JavaConstant forObject(Object value) {
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156 return HotSpotObjectConstantImpl.forObject(value);
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157 }
c33f0cb02b34 Add ConstantReflectionProvider.forObject method and make HotSpotObjectConstantImpl package-private.
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158
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159 @Override
18487
0f4813e0b4a9 Use asConstant() instead of asJavaConstant() where possible.
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parents: 18482
diff changeset
160 public ResolvedJavaType asJavaType(Constant constant) {
15909
e43591136d9f Support for compressed constants.
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parents: 15291
diff changeset
161 if (constant instanceof HotSpotObjectConstant) {
18290
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parents: 18266
diff changeset
162 Object obj = ((HotSpotObjectConstantImpl) constant).object();
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163 if (obj instanceof Class) {
21552
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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164 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj);
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165 }
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parents: 13488
diff changeset
166 }
16183
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
167 if (constant instanceof HotSpotMetaspaceConstant) {
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
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parents: 22555
diff changeset
168 MetaspaceWrapperObject obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant);
18223
17c98fad6980 converted HotSpotResolvedObjectType to an interface
Doug Simon <doug.simon@oracle.com>
parents: 18188
diff changeset
169 if (obj instanceof HotSpotResolvedObjectTypeImpl) {
16183
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parents: 15909
diff changeset
170 return (ResolvedJavaType) obj;
b1be2a46cc5c canonicalize LoadMethodNodes
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parents: 15909
diff changeset
171 }
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
172 }
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diff changeset
173 return null;
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diff changeset
174 }
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
175
22757
f4c4cc22a31c tightened signature of ConstantReflectionProvider methods for reading fields
Doug Simon <doug.simon@oracle.com>
parents: 22672
diff changeset
176 public JavaConstant readFieldValue(ResolvedJavaField field, JavaConstant receiver) {
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
177 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
21377
6f2ff1bccbf1 Adhere to specification described in JavaDoc of interface
Christian Wimmer <christian.wimmer@oracle.com>
parents: 21290
diff changeset
178 if (hotspotField.isStatic()) {
18465
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Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
179 HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass();
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
180 if (holder.isInitialized()) {
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
Roland Schatz <roland.schatz@oracle.com>
parents: 22054
diff changeset
181 return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), HotSpotObjectConstantImpl.forObject(holder.mirror()), hotspotField.offset());
18465
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Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
182 }
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
183 } else {
21377
6f2ff1bccbf1 Adhere to specification described in JavaDoc of interface
Christian Wimmer <christian.wimmer@oracle.com>
parents: 21290
diff changeset
184 if (receiver.isNonNull() && hotspotField.isInObject(((HotSpotObjectConstantImpl) receiver).object())) {
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
Roland Schatz <roland.schatz@oracle.com>
parents: 22054
diff changeset
185 return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), receiver, hotspotField.offset());
21377
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Christian Wimmer <christian.wimmer@oracle.com>
parents: 21290
diff changeset
186 }
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
187 }
21377
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Christian Wimmer <christian.wimmer@oracle.com>
parents: 21290
diff changeset
188 return null;
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
189 }
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
190
23290
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
191 @Override
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
192 public JavaConstant asJavaClass(ResolvedJavaType type) {
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
193 return HotSpotObjectConstantImpl.forObject(((HotSpotResolvedJavaType) type).mirror());
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
194 }
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
195
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
196 @Override
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
197 public Constant asObjectHub(ResolvedJavaType type) {
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
198 if (type instanceof HotSpotResolvedObjectType) {
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
199 return ((HotSpotResolvedObjectType) type).klass();
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
200 } else {
23392
b3a816d3b844 Backed out changeset: a920338dd4d4
Doug Simon <doug.simon@oracle.com>
parents: 23387
diff changeset
201 throw JVMCIError.unimplemented();
23290
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
202 }
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
203 }
12429
5124eeec1a7b split HotSpotRuntime into separate provider implementations
Doug Simon <doug.simon@oracle.com>
parents:
diff changeset
204 }