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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotConstantReflectionProvider.java @ 23738:1140503536ae jvmci-0.19

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Backport style fixes and comments from jdk9.
author Roland Schatz <roland.schatz@oracle.com>
date Fri, 12 Aug 2016 11:07:39 +0200
parents 3e8ce13f4e12
children 2e9d95cef56b
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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 import java.util.Objects;
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27
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28 import jdk.vm.ci.common.JVMCIError;
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29 import jdk.vm.ci.meta.Constant;
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30 import jdk.vm.ci.meta.ConstantReflectionProvider;
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31 import jdk.vm.ci.meta.JavaConstant;
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32 import jdk.vm.ci.meta.JavaKind;
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33 import jdk.vm.ci.meta.MemoryAccessProvider;
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34 import jdk.vm.ci.meta.MethodHandleAccessProvider;
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35 import jdk.vm.ci.meta.ResolvedJavaField;
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36 import jdk.vm.ci.meta.ResolvedJavaType;
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37
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38 /**
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39 * HotSpot implementation of {@link ConstantReflectionProvider}.
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40 */
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41 public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider {
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42
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43 protected final HotSpotJVMCIRuntimeProvider runtime;
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44 protected final HotSpotMethodHandleAccessProvider methodHandleAccess;
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45 protected final HotSpotMemoryAccessProviderImpl memoryAccess;
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46
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47 public HotSpotConstantReflectionProvider(HotSpotJVMCIRuntimeProvider runtime) {
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48 this.runtime = runtime;
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49 this.methodHandleAccess = new HotSpotMethodHandleAccessProvider(this);
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50 this.memoryAccess = new HotSpotMemoryAccessProviderImpl(runtime);
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51 }
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52
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53 public MethodHandleAccessProvider getMethodHandleAccess() {
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54 return methodHandleAccess;
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55 }
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56
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57 @Override
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58 public MemoryAccessProvider getMemoryAccessProvider() {
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59 return memoryAccess;
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60 }
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61
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62 @Override
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63 public Boolean constantEquals(Constant x, Constant y) {
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64 if (x == y) {
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65 return true;
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66 } else if (x instanceof HotSpotObjectConstantImpl) {
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67 return y instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) x).object() == ((HotSpotObjectConstantImpl) y).object();
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68 } else {
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69 return Objects.equals(x, y);
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70 }
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71 }
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72
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73 @Override
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74 public Integer readArrayLength(JavaConstant array) {
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75 if (array == null || array.getJavaKind() != JavaKind.Object || array.isNull()) {
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76 return null;
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77 }
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78
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79 Object arrayObject = ((HotSpotObjectConstantImpl) array).object();
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80 if (!arrayObject.getClass().isArray()) {
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81 return null;
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82 }
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83 return Array.getLength(arrayObject);
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84 }
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85
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86 @Override
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87 public JavaConstant readArrayElement(JavaConstant array, int index) {
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88 if (array == null || array.getJavaKind() != JavaKind.Object || array.isNull()) {
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89 return null;
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90 }
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91 Object a = ((HotSpotObjectConstantImpl) array).object();
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92
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93 if (!a.getClass().isArray() || index < 0 || index >= Array.getLength(a)) {
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94 return null;
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95 }
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96
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97 if (a instanceof Object[]) {
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98 Object element = ((Object[]) a)[index];
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99 return HotSpotObjectConstantImpl.forObject(element);
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100 } else {
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101 return JavaConstant.forBoxedPrimitive(Array.get(a, index));
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102 }
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103 }
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104
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105 /**
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106 * Check if the constant is a boxed value that is guaranteed to be cached by the platform.
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107 * Otherwise the generated code might be the only reference to the boxed value and since object
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108 * references from nmethods are weak this can cause GC problems.
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109 *
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110 * @param source
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111 * @return true if the box is cached
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112 */
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113 private static boolean isBoxCached(JavaConstant source) {
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114 switch (source.getJavaKind()) {
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115 case Boolean:
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116 return true;
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117 case Char:
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118 return source.asInt() <= 127;
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119 case Byte:
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120 case Short:
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121 case Int:
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122 return source.asInt() >= -128 && source.asInt() <= 127;
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123 case Long:
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124 return source.asLong() >= -128 && source.asLong() <= 127;
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125 case Float:
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126 case Double:
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127 return false;
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128 default:
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129 throw new IllegalArgumentException("unexpected kind " + source.getJavaKind());
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130 }
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131 }
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132
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133 @Override
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134 public JavaConstant boxPrimitive(JavaConstant source) {
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135 if (source == null || !source.getJavaKind().isPrimitive() || !isBoxCached(source)) {
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136 return null;
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137 }
18262
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138 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive());
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139 }
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140
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141 @Override
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142 public JavaConstant unboxPrimitive(JavaConstant source) {
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143 if (source == null || !source.getJavaKind().isObject()) {
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144 return null;
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145 }
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146 if (source.isNull()) {
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147 return null;
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148 }
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149 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object());
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150 }
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151
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152 public JavaConstant forString(String value) {
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153 return HotSpotObjectConstantImpl.forObject(value);
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154 }
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155
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156 public JavaConstant forObject(Object value) {
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157 return HotSpotObjectConstantImpl.forObject(value);
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158 }
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159
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160 @Override
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0f4813e0b4a9 Use asConstant() instead of asJavaConstant() where possible.
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161 public ResolvedJavaType asJavaType(Constant constant) {
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162 if (constant instanceof HotSpotObjectConstant) {
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163 Object obj = ((HotSpotObjectConstantImpl) constant).object();
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164 if (obj instanceof Class) {
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parents: 21459
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165 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj);
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166 }
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167 }
16183
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168 if (constant instanceof HotSpotMetaspaceConstant) {
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169 MetaspaceWrapperObject obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant);
18223
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170 if (obj instanceof HotSpotResolvedObjectTypeImpl) {
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171 return (ResolvedJavaType) obj;
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172 }
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parents: 15909
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173 }
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174 return null;
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175 }
18465
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diff changeset
176
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f4c4cc22a31c tightened signature of ConstantReflectionProvider methods for reading fields
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177 public JavaConstant readFieldValue(ResolvedJavaField field, JavaConstant receiver) {
18465
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parents: 18362
diff changeset
178 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
21377
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diff changeset
179 if (hotspotField.isStatic()) {
18465
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diff changeset
180 HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass();
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diff changeset
181 if (holder.isInitialized()) {
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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diff changeset
182 return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), HotSpotObjectConstantImpl.forObject(holder.mirror()), hotspotField.offset());
18465
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diff changeset
183 }
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
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diff changeset
184 } else {
21377
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diff changeset
185 if (receiver.isNonNull() && hotspotField.isInObject(((HotSpotObjectConstantImpl) receiver).object())) {
22536
dc1aeef79e7e Refactoring: Rename Kind to JavaKind.
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diff changeset
186 return memoryAccess.readUnsafeConstant(hotspotField.getJavaKind(), receiver, hotspotField.offset());
21377
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diff changeset
187 }
18465
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Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
188 }
21377
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Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
189 return null;
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
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parents: 18362
diff changeset
190 }
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
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diff changeset
191
23290
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Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
192 @Override
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diff changeset
193 public JavaConstant asJavaClass(ResolvedJavaType type) {
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
194 return HotSpotObjectConstantImpl.forObject(((HotSpotResolvedJavaType) type).mirror());
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parents: 22760
diff changeset
195 }
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Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
196
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
197 @Override
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diff changeset
198 public Constant asObjectHub(ResolvedJavaType type) {
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diff changeset
199 if (type instanceof HotSpotResolvedObjectType) {
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
200 return ((HotSpotResolvedObjectType) type).klass();
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
201 } else {
23392
b3a816d3b844 Backed out changeset: a920338dd4d4
Doug Simon <doug.simon@oracle.com>
parents: 23387
diff changeset
202 throw JVMCIError.unimplemented();
23290
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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parents: 22760
diff changeset
203 }
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
204 }
12429
5124eeec1a7b split HotSpotRuntime into separate provider implementations
Doug Simon <doug.simon@oracle.com>
parents:
diff changeset
205 }