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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotConstantReflectionProvider.java @ 24234:ea6f94ab283b default tip

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Added tag jvmci-0.36 for changeset 8128b98d4736
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Mon, 18 Sep 2017 18:49:45 +0200
parents 8cf4cf3f9f2a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 if (a instanceof int[]) {
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102 return JavaConstant.forInt(((int[]) a)[index]);
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103 } else if (a instanceof char[]) {
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104 return JavaConstant.forChar(((char[]) a)[index]);
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105 } else if (a instanceof byte[]) {
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106 return JavaConstant.forByte(((byte[]) a)[index]);
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107 } else if (a instanceof long[]) {
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108 return JavaConstant.forLong(((long[]) a)[index]);
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109 } else if (a instanceof short[]) {
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110 return JavaConstant.forShort(((short[]) a)[index]);
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111 } else if (a instanceof float[]) {
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112 return JavaConstant.forFloat(((float[]) a)[index]);
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113 } else if (a instanceof double[]) {
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114 return JavaConstant.forDouble(((double[]) a)[index]);
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115 } else if (a instanceof boolean[]) {
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116 return JavaConstant.forBoolean(((boolean[]) a)[index]);
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117 } else {
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118 throw new JVMCIError("Should not reach here");
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119 }
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120 }
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121 }
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122
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123 /**
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124 * Check if the constant is a boxed value that is guaranteed to be cached by the platform.
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125 * Otherwise the generated code might be the only reference to the boxed value and since object
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126 * references from nmethods are weak this can cause GC problems.
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127 *
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128 * @param source
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129 * @return true if the box is cached
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130 */
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131 private static boolean isBoxCached(JavaConstant source) {
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132 switch (source.getJavaKind()) {
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133 case Boolean:
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134 return true;
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135 case Char:
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136 return source.asInt() <= 127;
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137 case Byte:
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138 case Short:
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139 case Int:
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140 return source.asInt() >= -128 && source.asInt() <= 127;
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141 case Long:
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142 return source.asLong() >= -128 && source.asLong() <= 127;
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143 case Float:
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144 case Double:
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145 return false;
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146 default:
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147 throw new IllegalArgumentException("unexpected kind " + source.getJavaKind());
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148 }
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149 }
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150
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151 @Override
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152 public JavaConstant boxPrimitive(JavaConstant source) {
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153 if (source == null || !source.getJavaKind().isPrimitive() || !isBoxCached(source)) {
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154 return null;
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155 }
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156 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive());
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157 }
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158
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159 @Override
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160 public JavaConstant unboxPrimitive(JavaConstant source) {
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161 if (source == null || !source.getJavaKind().isObject()) {
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162 return null;
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163 }
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164 if (source.isNull()) {
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165 return null;
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166 }
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167 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object());
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168 }
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169
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170 public JavaConstant forString(String value) {
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171 return HotSpotObjectConstantImpl.forObject(value);
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172 }
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173
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174 public JavaConstant forObject(Object value) {
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175 return HotSpotObjectConstantImpl.forObject(value);
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176 }
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177
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178 @Override
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0f4813e0b4a9 Use asConstant() instead of asJavaConstant() where possible.
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179 public ResolvedJavaType asJavaType(Constant constant) {
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e43591136d9f Support for compressed constants.
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180 if (constant instanceof HotSpotObjectConstant) {
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181 Object obj = ((HotSpotObjectConstantImpl) constant).object();
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182 if (obj instanceof Class) {
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183 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj);
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184 }
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185 }
16183
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186 if (constant instanceof HotSpotMetaspaceConstant) {
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187 MetaspaceWrapperObject obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant);
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188 if (obj instanceof HotSpotResolvedObjectTypeImpl) {
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189 return (ResolvedJavaType) obj;
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190 }
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191 }
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192 return null;
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193 }
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194
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195 public JavaConstant readFieldValue(ResolvedJavaField field, JavaConstant receiver) {
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196 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
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197 if (hotspotField.isStatic()) {
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198 HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass();
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diff changeset
199 if (holder.isInitialized()) {
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8cf4cf3f9f2a missing checks in HotSpotMemoryAccessProviderImpl can cause VM assertions to fail - part 3 (JDK-8177673)
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200 return memoryAccess.readFieldValue(hotspotField, holder.mirror());
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201 }
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diff changeset
202 } else {
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diff changeset
203 if (receiver.isNonNull()) {
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diff changeset
204 Object object = ((HotSpotObjectConstantImpl) receiver).object();
8cf4cf3f9f2a missing checks in HotSpotMemoryAccessProviderImpl can cause VM assertions to fail - part 3 (JDK-8177673)
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diff changeset
205 if (hotspotField.isInObject(object)) {
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diff changeset
206 return memoryAccess.readFieldValue(hotspotField, object);
8cf4cf3f9f2a missing checks in HotSpotMemoryAccessProviderImpl can cause VM assertions to fail - part 3 (JDK-8177673)
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diff changeset
207 }
21377
6f2ff1bccbf1 Adhere to specification described in JavaDoc of interface
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diff changeset
208 }
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
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diff changeset
209 }
21377
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diff changeset
210 return null;
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
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diff changeset
211 }
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
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diff changeset
212
23290
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
213 @Override
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Christian Wimmer <christian.wimmer@oracle.com>
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diff changeset
214 public JavaConstant asJavaClass(ResolvedJavaType type) {
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
215 return HotSpotObjectConstantImpl.forObject(((HotSpotResolvedJavaType) type).mirror());
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
216 }
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diff changeset
217
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
218 @Override
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diff changeset
219 public Constant asObjectHub(ResolvedJavaType type) {
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diff changeset
220 if (type instanceof HotSpotResolvedObjectType) {
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
221 return ((HotSpotResolvedObjectType) type).klass();
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
222 } else {
23392
b3a816d3b844 Backed out changeset: a920338dd4d4
Doug Simon <doug.simon@oracle.com>
parents: 23387
diff changeset
223 throw JVMCIError.unimplemented();
23290
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
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diff changeset
224 }
87394b31a42e Move lookup of Java class and hub from ResolvedJavaType to ConstantReflectionProvider
Christian Wimmer <christian.wimmer@oracle.com>
parents: 22760
diff changeset
225 }
12429
5124eeec1a7b split HotSpotRuntime into separate provider implementations
Doug Simon <doug.simon@oracle.com>
parents:
diff changeset
226 }