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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/jvmci/HotSpotConstantReflectionProvider.java @ 21547:78f0792aa890

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fixed expected exception type in some TestResolvedJavaType tests
author Doug Simon <doug.simon@oracle.com>
date Tue, 26 May 2015 11:14:59 +0200
parents d3002f7bd223
children
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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 com.oracle.graal.hotspot.jvmci;
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24
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25 import static com.oracle.graal.hotspot.jvmci.HotSpotConstantReflectionProvider.Options.*;
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26
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27 import java.lang.reflect.*;
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28
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29 import com.oracle.graal.api.meta.*;
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30 import com.oracle.graal.options.*;
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31
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32 /**
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33 * HotSpot implementation of {@link ConstantReflectionProvider}.
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34 */
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35 public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider, HotSpotProxified {
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36
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37 static class Options {
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38 //@formatter:off
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39 @Option(help = "Constant fold final fields with default values.", type = OptionType.Debug)
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40 public static final OptionValue<Boolean> TrustFinalDefaultFields = new OptionValue<>(true);
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41 //@formatter:on
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42 }
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43
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44 protected final HotSpotJVMCIRuntimeProvider runtime;
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45 protected final HotSpotMethodHandleAccessProvider methodHandleAccess;
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46 protected final HotSpotMemoryAccessProviderImpl memoryAccess;
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47
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48 public HotSpotConstantReflectionProvider(HotSpotJVMCIRuntimeProvider runtime) {
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49 this.runtime = runtime;
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50 this.methodHandleAccess = new HotSpotMethodHandleAccessProvider(this);
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51 this.memoryAccess = new HotSpotMemoryAccessProviderImpl(runtime);
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52 }
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53
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54 public MethodHandleAccessProvider getMethodHandleAccess() {
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55 return methodHandleAccess;
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56 }
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57
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58 @Override
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59 public MemoryAccessProvider getMemoryAccessProvider() {
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60 return memoryAccess;
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61 }
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62
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63 @Override
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64 public Boolean constantEquals(Constant x, Constant y) {
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65 if (x == y) {
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66 return true;
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67 } else if (x instanceof HotSpotObjectConstantImpl) {
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68 return y instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) x).object() == ((HotSpotObjectConstantImpl) y).object();
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69 } else {
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70 return x.equals(y);
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71 }
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72 }
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73
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74 @Override
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75 public Integer readArrayLength(JavaConstant array) {
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76 if (array.getKind() != Kind.Object || array.isNull()) {
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77 return null;
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78 }
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79
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80 Object arrayObject = ((HotSpotObjectConstantImpl) array).object();
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81 if (!arrayObject.getClass().isArray()) {
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82 return null;
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83 }
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84 return Array.getLength(arrayObject);
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85 }
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86
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87 public JavaConstant readConstantArrayElement(JavaConstant array, int index) {
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88 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) {
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89 JavaConstant element = readArrayElement(array, index);
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90 if (element != null && (((HotSpotObjectConstantImpl) array).isDefaultStable() || !element.isDefaultForKind())) {
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91 return element;
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92 }
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93 }
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94 return null;
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95 }
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96
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97 /**
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98 * Try to convert {@code offset} into an an index into {@code array}.
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99 *
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100 * @return -1 if the offset isn't within the array or the computed index
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101 */
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102 private int indexForOffset(JavaConstant array, long offset) {
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103 if (array.getKind() != Kind.Object || array.isNull()) {
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104 return -1;
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105 }
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106 Class<?> componentType = ((HotSpotObjectConstantImpl) array).object().getClass().getComponentType();
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107 Kind kind = runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(componentType).getKind();
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108 int arraybase = runtime.getArrayBaseOffset(kind);
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109 int scale = runtime.getArrayIndexScale(kind);
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110 if (offset < arraybase) {
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111 return -1;
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112 }
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113 long index = offset - arraybase;
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114 if (index % scale != 0) {
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115 return -1;
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116 }
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117 long result = index / scale;
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118 if (result >= Integer.MAX_VALUE) {
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119 return -1;
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120 }
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121 return (int) result;
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122 }
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123
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124 public JavaConstant readConstantArrayElementForOffset(JavaConstant array, long offset) {
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125 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) {
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126 return readConstantArrayElement(array, indexForOffset(array, offset));
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127 }
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128 return null;
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129 }
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130
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131 @Override
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132 public JavaConstant readArrayElement(JavaConstant array, int index) {
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133 if (array.getKind() != Kind.Object || array.isNull()) {
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134 return null;
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135 }
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136 Object a = ((HotSpotObjectConstantImpl) array).object();
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137
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138 if (index < 0 || index >= Array.getLength(a)) {
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139 return null;
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140 }
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141
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142 if (a instanceof Object[]) {
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143 Object element = ((Object[]) a)[index];
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144 if (((HotSpotObjectConstantImpl) array).getStableDimension() > 1) {
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145 return HotSpotObjectConstantImpl.forStableArray(element, ((HotSpotObjectConstantImpl) array).getStableDimension() - 1, ((HotSpotObjectConstantImpl) array).isDefaultStable());
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146 } else {
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147 return HotSpotObjectConstantImpl.forObject(element);
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148 }
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149 } else {
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150 return JavaConstant.forBoxedPrimitive(Array.get(a, index));
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151 }
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152 }
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153
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154 /**
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155 * Check if the constant is a boxed value that is guaranteed to be cached by the platform.
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156 * Otherwise the generated code might be the only reference to the boxed value and since object
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157 * references from nmethods are weak this can cause GC problems.
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158 *
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159 * @param source
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160 * @return true if the box is cached
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161 */
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162 private static boolean isBoxCached(JavaConstant source) {
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163 switch (source.getKind()) {
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164 case Boolean:
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165 return true;
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166 case Char:
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167 return source.asInt() <= 127;
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168 case Byte:
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169 case Short:
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170 case Int:
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171 return source.asInt() >= -128 && source.asInt() <= 127;
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172 case Long:
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173 return source.asLong() >= -128 && source.asLong() <= 127;
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174 case Float:
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175 case Double:
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176 return false;
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177 default:
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178 throw new IllegalArgumentException("unexpected kind " + source.getKind());
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179 }
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180 }
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181
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182 @Override
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183 public JavaConstant boxPrimitive(JavaConstant source) {
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184 if (!source.getKind().isPrimitive() || !isBoxCached(source)) {
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185 return null;
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186 }
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187 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive());
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188 }
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189
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190 @Override
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191 public JavaConstant unboxPrimitive(JavaConstant source) {
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192 if (!source.getKind().isObject()) {
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193 return null;
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194 }
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195 if (source.isNull()) {
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196 return null;
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197 }
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198 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object());
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199 }
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200
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201 public JavaConstant forString(String value) {
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202 return HotSpotObjectConstantImpl.forObject(value);
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203 }
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204
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205 @Override
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206 public ResolvedJavaType asJavaType(Constant constant) {
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207 if (constant instanceof HotSpotObjectConstant) {
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208 Object obj = ((HotSpotObjectConstantImpl) constant).object();
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209 if (obj instanceof Class) {
21539
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210 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj);
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211 }
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212 }
16183
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213 if (constant instanceof HotSpotMetaspaceConstant) {
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214 Object obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant);
18223
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215 if (obj instanceof HotSpotResolvedObjectTypeImpl) {
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216 return (ResolvedJavaType) obj;
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217 }
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218 }
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219 return null;
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220 }
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
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221
21539
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222 private static final String SystemClassName = "Ljava/lang/System;";
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223
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224 /**
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225 * Determines if a static field is constant for the purpose of
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226 * {@link #readConstantFieldValue(JavaField, JavaConstant)}.
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227 */
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228 protected boolean isStaticFieldConstant(HotSpotResolvedJavaField staticField) {
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229 if (staticField.isFinal() || staticField.isStable()) {
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230 ResolvedJavaType holder = staticField.getDeclaringClass();
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231 if (holder.isInitialized() && !holder.getName().equals(SystemClassName)) {
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232 return true;
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233 }
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234 }
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diff changeset
235 return false;
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236 }
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237
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diff changeset
238 /**
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239 * Determines if a value read from a {@code final} instance field is considered constant. The
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240 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is
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241 * not the {@link JavaConstant#isDefaultForKind default value} for its kind or if
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242 * {@link Options#TrustFinalDefaultFields} is true.
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diff changeset
243 *
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244 * @param value a value read from a {@code final} instance field
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245 * @param receiverClass the {@link Object#getClass() class} of object from which the
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246 * {@code value} was read
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diff changeset
247 */
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diff changeset
248 protected boolean isFinalInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) {
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diff changeset
249 return !value.isDefaultForKind() || TrustFinalDefaultFields.getValue();
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diff changeset
250 }
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diff changeset
251
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diff changeset
252 /**
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diff changeset
253 * Determines if a value read from a {@link Stable} instance field is considered constant. The
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254 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is
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255 * not the {@link JavaConstant#isDefaultForKind default value} for its kind.
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256 *
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257 * @param value a value read from a {@link Stable} field
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258 * @param receiverClass the {@link Object#getClass() class} of object from which the
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259 * {@code value} was read
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260 */
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261 protected boolean isStableInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) {
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262 return !value.isDefaultForKind();
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263 }
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264
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265 /**
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266 * {@inheritDoc}
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267 * <p>
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268 * The {@code value} field in {@link OptionValue} is considered constant if the type of
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269 * {@code receiver} is (assignable to) {@link StableOptionValue}.
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270 */
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271 public JavaConstant readConstantFieldValue(JavaField field, JavaConstant receiver) {
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272 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
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273
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274 if (hotspotField.isStatic()) {
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275 if (isStaticFieldConstant(hotspotField)) {
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276 JavaConstant value = readFieldValue(field, receiver);
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277 if (hotspotField.isFinal() || !value.isDefaultForKind()) {
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278 return value;
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279 }
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280 }
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281 } else {
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282 /*
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283 * for non-static final fields, we must assume that they are only initialized if they
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284 * have a non-default value.
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285 */
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286 Object object = receiver.isNull() ? null : ((HotSpotObjectConstantImpl) receiver).object();
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287
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288 // Canonicalization may attempt to process an unsafe read before
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289 // processing a guard (e.g. a null check or a type check) for this read
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290 // so we need to check the object being read
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291 if (object != null) {
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292 if (hotspotField.isFinal()) {
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293 if (hotspotField.isInObject(object)) {
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294 JavaConstant value = readFieldValue(field, receiver);
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295 if (isFinalInstanceFieldValueConstant(value, object.getClass())) {
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296 return value;
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297 }
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298 }
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299 } else if (hotspotField.isStable()) {
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300 if (hotspotField.isInObject(object)) {
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301 JavaConstant value = readFieldValue(field, receiver);
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302 if (isStableInstanceFieldValueConstant(value, object.getClass())) {
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303 return value;
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304 }
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305 }
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306 } else {
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307 Class<?> clazz = object.getClass();
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308 if (StableOptionValue.class.isAssignableFrom(clazz)) {
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309 if (hotspotField.isInObject(object) && hotspotField.getName().equals("value")) {
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310 StableOptionValue<?> option = (StableOptionValue<?>) object;
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311 return HotSpotObjectConstantImpl.forObject(option.getValue());
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312 }
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313 }
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314 }
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315 }
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316 }
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317 return null;
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318 }
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319
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320 public JavaConstant readFieldValue(JavaField field, JavaConstant receiver) {
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321 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
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322 if (!hotspotField.isStable()) {
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323 return readNonStableFieldValue(field, receiver);
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324 } else {
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325 return readStableFieldValue(field, receiver, false);
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326 }
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327 }
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328
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329 private JavaConstant readNonStableFieldValue(JavaField field, JavaConstant receiver) {
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330 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
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331 if (hotspotField.isStatic()) {
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332 HotSpotResolvedJavaType holder = (HotSpotResolvedJavaType) hotspotField.getDeclaringClass();
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333 if (holder.isInitialized()) {
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334 return memoryAccess.readUnsafeConstant(hotspotField.getKind(), HotSpotObjectConstantImpl.forObject(holder.mirror()), hotspotField.offset());
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335 }
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336 } else {
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337 if (receiver.isNonNull() && hotspotField.isInObject(((HotSpotObjectConstantImpl) receiver).object())) {
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338 return memoryAccess.readUnsafeConstant(hotspotField.getKind(), receiver, hotspotField.offset());
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339 }
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340 }
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341 return null;
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342 }
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343
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344 public JavaConstant readStableFieldValue(JavaField field, JavaConstant receiver, boolean isDefaultStable) {
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345 JavaConstant fieldValue = readNonStableFieldValue(field, receiver);
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346 if (fieldValue.isNonNull()) {
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347 JavaType declaredType = field.getType();
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348 if (declaredType.getComponentType() != null) {
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349 int stableDimension = getArrayDimension(declaredType);
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350 return HotSpotObjectConstantImpl.forStableArray(((HotSpotObjectConstantImpl) fieldValue).object(), stableDimension, isDefaultStable);
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351 }
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352 }
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353 return fieldValue;
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354 }
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355
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356 private static int getArrayDimension(JavaType type) {
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357 int dimensions = 0;
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358 JavaType componentType = type;
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359 while ((componentType = componentType.getComponentType()) != null) {
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360 dimensions++;
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361 }
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362 return dimensions;
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363 }
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364 }