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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotConstantReflectionProvider.java @ 22760:4cf1946f59fc

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must not fold accesses to @Stable fields if -XX:-FoldStableValues (GRAAL-58)
author Doug Simon <doug.simon@oracle.com>
date Sat, 26 Dec 2015 15:00:55 +0100
parents a130b51efb07
children 87394b31a42e
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1 /*
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2 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package jdk.vm.ci.hotspot;
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24
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25 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayBaseOffset;
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26 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayIndexScale;
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28 import java.lang.reflect.Array;
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29
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30 import jdk.vm.ci.meta.Constant;
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31 import jdk.vm.ci.meta.ConstantReflectionProvider;
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32 import jdk.vm.ci.meta.JavaConstant;
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33 import jdk.vm.ci.meta.JavaKind;
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34 import jdk.vm.ci.meta.JavaType;
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35 import jdk.vm.ci.meta.MemoryAccessProvider;
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36 import jdk.vm.ci.meta.MethodHandleAccessProvider;
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37 import jdk.vm.ci.meta.ResolvedJavaField;
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38 import jdk.vm.ci.meta.ResolvedJavaType;
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39
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40 /**
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41 * HotSpot implementation of {@link ConstantReflectionProvider}.
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42 */
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43 public class HotSpotConstantReflectionProvider implements ConstantReflectionProvider, HotSpotProxified {
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44
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45 private static final String TrustFinalDefaultFieldsProperty = "jvmci.TrustFinalDefaultFields";
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46
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47 /**
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48 * Determines whether to treat {@code final} fields with default values as constant.
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49 */
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50 private static final boolean TrustFinalDefaultFields = HotSpotJVMCIRuntime.getBooleanOption(TrustFinalDefaultFieldsProperty, true);
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51
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52 protected final HotSpotJVMCIRuntimeProvider runtime;
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53 protected final HotSpotMethodHandleAccessProvider methodHandleAccess;
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54 protected final HotSpotMemoryAccessProviderImpl memoryAccess;
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55
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56 public HotSpotConstantReflectionProvider(HotSpotJVMCIRuntimeProvider runtime) {
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57 this.runtime = runtime;
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58 this.methodHandleAccess = new HotSpotMethodHandleAccessProvider(this);
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59 this.memoryAccess = new HotSpotMemoryAccessProviderImpl(runtime);
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60 }
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61
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62 public MethodHandleAccessProvider getMethodHandleAccess() {
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63 return methodHandleAccess;
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64 }
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65
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66 @Override
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67 public MemoryAccessProvider getMemoryAccessProvider() {
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68 return memoryAccess;
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69 }
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70
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71 @Override
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72 public Boolean constantEquals(Constant x, Constant y) {
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73 if (x == y) {
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74 return true;
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75 } else if (x instanceof HotSpotObjectConstantImpl) {
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76 return y instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) x).object() == ((HotSpotObjectConstantImpl) y).object();
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77 } else {
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78 return x.equals(y);
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79 }
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80 }
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81
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82 @Override
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83 public Integer readArrayLength(JavaConstant array) {
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84 if (array.getJavaKind() != JavaKind.Object || array.isNull()) {
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85 return null;
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86 }
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87
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88 Object arrayObject = ((HotSpotObjectConstantImpl) array).object();
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89 if (!arrayObject.getClass().isArray()) {
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90 return null;
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91 }
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92 return Array.getLength(arrayObject);
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93 }
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94
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95 public JavaConstant readConstantArrayElement(JavaConstant array, int index) {
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96 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) {
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97 JavaConstant element = readArrayElement(array, index);
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98 if (element != null && (((HotSpotObjectConstantImpl) array).isDefaultStable() || !element.isDefaultForKind())) {
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99 return element;
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100 }
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101 }
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102 return null;
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103 }
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104
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105 /**
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106 * Try to convert {@code offset} into an an index into {@code array}.
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107 *
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108 * @return the computed index or -1 if the offset isn't within the array
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109 */
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110 private int indexForOffset(JavaConstant array, long offset) {
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111 if (array.getJavaKind() != JavaKind.Object || array.isNull()) {
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112 return -1;
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113 }
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114 Class<?> componentType = ((HotSpotObjectConstantImpl) array).object().getClass().getComponentType();
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115 JavaKind kind = runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(componentType).getJavaKind();
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116 int arraybase = getArrayBaseOffset(kind);
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117 int scale = getArrayIndexScale(kind);
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118 if (offset < arraybase) {
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119 return -1;
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120 }
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121 long index = offset - arraybase;
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122 if (index % scale != 0) {
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123 return -1;
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124 }
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125 long result = index / scale;
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126 if (result >= Integer.MAX_VALUE) {
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127 return -1;
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128 }
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129 return (int) result;
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130 }
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131
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132 public JavaConstant readConstantArrayElementForOffset(JavaConstant array, long offset) {
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133 if (array instanceof HotSpotObjectConstantImpl && ((HotSpotObjectConstantImpl) array).getStableDimension() > 0) {
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134 return readConstantArrayElement(array, indexForOffset(array, offset));
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135 }
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136 return null;
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137 }
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138
15023
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diff changeset
139 @Override
18187
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140 public JavaConstant readArrayElement(JavaConstant array, int index) {
22536
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141 if (array.getJavaKind() != JavaKind.Object || array.isNull()) {
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142 return null;
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143 }
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144 Object a = ((HotSpotObjectConstantImpl) array).object();
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145
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146 if (index < 0 || index >= Array.getLength(a)) {
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147 return null;
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148 }
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149
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150 if (a instanceof Object[]) {
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151 Object element = ((Object[]) a)[index];
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152 if (((HotSpotObjectConstantImpl) array).getStableDimension() > 1) {
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153 return HotSpotObjectConstantImpl.forStableArray(element, ((HotSpotObjectConstantImpl) array).getStableDimension() - 1, ((HotSpotObjectConstantImpl) array).isDefaultStable());
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154 } else {
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155 return HotSpotObjectConstantImpl.forObject(element);
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156 }
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157 } else {
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158 return JavaConstant.forBoxedPrimitive(Array.get(a, index));
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159 }
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160 }
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161
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162 /**
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163 * Check if the constant is a boxed value that is guaranteed to be cached by the platform.
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164 * Otherwise the generated code might be the only reference to the boxed value and since object
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165 * references from nmethods are weak this can cause GC problems.
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166 *
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167 * @param source
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168 * @return true if the box is cached
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169 */
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170 private static boolean isBoxCached(JavaConstant source) {
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171 switch (source.getJavaKind()) {
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172 case Boolean:
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173 return true;
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174 case Char:
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175 return source.asInt() <= 127;
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176 case Byte:
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177 case Short:
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178 case Int:
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179 return source.asInt() >= -128 && source.asInt() <= 127;
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180 case Long:
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181 return source.asLong() >= -128 && source.asLong() <= 127;
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182 case Float:
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183 case Double:
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184 return false;
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185 default:
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186 throw new IllegalArgumentException("unexpected kind " + source.getJavaKind());
18801
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187 }
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188 }
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189
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190 @Override
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diff changeset
191 public JavaConstant boxPrimitive(JavaConstant source) {
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diff changeset
192 if (!source.getJavaKind().isPrimitive() || !isBoxCached(source)) {
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193 return null;
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194 }
18262
f7d45e2426d4 converted HotSpotObjectConstant to an interface
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diff changeset
195 return HotSpotObjectConstantImpl.forObject(source.asBoxedPrimitive());
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196 }
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197
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diff changeset
198 @Override
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9619ba4daf4c Rename Constant to JavaConstant.
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diff changeset
199 public JavaConstant unboxPrimitive(JavaConstant source) {
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diff changeset
200 if (!source.getJavaKind().isObject()) {
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diff changeset
201 return null;
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diff changeset
202 }
18293
ab8fbaa5e72f fixed minor regressions after removing HotSpotObjectConstantImpl.asObject()
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diff changeset
203 if (source.isNull()) {
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diff changeset
204 return null;
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Doug Simon <doug.simon@oracle.com>
parents: 18290
diff changeset
205 }
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e7d219e9d01f removed HotSpotObjectConstantImpl.asObject()
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diff changeset
206 return JavaConstant.forBoxedPrimitive(((HotSpotObjectConstantImpl) source).object());
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diff changeset
207 }
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diff changeset
208
18295
17bf458cf86e reduced use of HotSpotObjectConstantImpl.forObject
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parents: 18293
diff changeset
209 public JavaConstant forString(String value) {
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diff changeset
210 return HotSpotObjectConstantImpl.forObject(value);
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diff changeset
211 }
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parents: 18293
diff changeset
212
22645
c33f0cb02b34 Add ConstantReflectionProvider.forObject method and make HotSpotObjectConstantImpl package-private.
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diff changeset
213 public JavaConstant forObject(Object value) {
c33f0cb02b34 Add ConstantReflectionProvider.forObject method and make HotSpotObjectConstantImpl package-private.
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diff changeset
214 return HotSpotObjectConstantImpl.forObject(value);
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diff changeset
215 }
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diff changeset
216
15018
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diff changeset
217 @Override
18487
0f4813e0b4a9 Use asConstant() instead of asJavaConstant() where possible.
Roland Schatz <roland.schatz@oracle.com>
parents: 18482
diff changeset
218 public ResolvedJavaType asJavaType(Constant constant) {
15909
e43591136d9f Support for compressed constants.
Roland Schatz <roland.schatz@oracle.com>
parents: 15291
diff changeset
219 if (constant instanceof HotSpotObjectConstant) {
18290
e7d219e9d01f removed HotSpotObjectConstantImpl.asObject()
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parents: 18266
diff changeset
220 Object obj = ((HotSpotObjectConstantImpl) constant).object();
15018
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diff changeset
221 if (obj instanceof Class) {
21552
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diff changeset
222 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType((Class<?>) obj);
15018
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diff changeset
223 }
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Christian Wimmer <christian.wimmer@oracle.com>
parents: 13488
diff changeset
224 }
16183
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
225 if (constant instanceof HotSpotMetaspaceConstant) {
22590
3f6488b29c1a Remove rawValue from HotSpotMetaspaceConstantImpl, patch raw pointer at code installation time.
Roland Schatz <roland.schatz@oracle.com>
parents: 22555
diff changeset
226 MetaspaceWrapperObject obj = HotSpotMetaspaceConstantImpl.getMetaspaceObject(constant);
18223
17c98fad6980 converted HotSpotResolvedObjectType to an interface
Doug Simon <doug.simon@oracle.com>
parents: 18188
diff changeset
227 if (obj instanceof HotSpotResolvedObjectTypeImpl) {
16183
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parents: 15909
diff changeset
228 return (ResolvedJavaType) obj;
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
229 }
b1be2a46cc5c canonicalize LoadMethodNodes
Tom Rodriguez <tom.rodriguez@oracle.com>
parents: 15909
diff changeset
230 }
15018
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diff changeset
231 return null;
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diff changeset
232 }
18465
f0a8b72315c1 Move ResolvedJavaField#read[Constant]Value and getMethodHandleAccess() to ConstantReflectionProvider
Andreas Woess <andreas.woess@jku.at>
parents: 18362
diff changeset
233
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diff changeset
234 private static final String SystemClassName = "Ljava/lang/System;";
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diff changeset
235
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diff changeset
236 /**
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diff changeset
237 * Determines if a static field is constant for the purpose of
22757
f4c4cc22a31c tightened signature of ConstantReflectionProvider methods for reading fields
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parents: 22672
diff changeset
238 * {@link #readConstantFieldValue(ResolvedJavaField, JavaConstant)}.
21552
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diff changeset
239 */
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diff changeset
240 protected boolean isStaticFieldConstant(HotSpotResolvedJavaField staticField) {
22760
4cf1946f59fc must not fold accesses to @Stable fields if -XX:-FoldStableValues (GRAAL-58)
Doug Simon <doug.simon@oracle.com>
parents: 22758
diff changeset
241 if (staticField.isFinal() || (staticField.isStable() && runtime.getConfig().foldStableValues)) {
21552
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diff changeset
242 ResolvedJavaType holder = staticField.getDeclaringClass();
9579a3c62a9e use skeleton findbugs jar containing only SuppresFBWarnings to avoid external dependency for JVMCI classes (JBS:GRAAL-53)
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parents: 21459
diff changeset
243 if (holder.isInitialized() && !holder.getName().equals(SystemClassName)) {
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parents: 21459
diff changeset
244 return true;
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diff changeset
245 }
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diff changeset
246 }
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diff changeset
247 return false;
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diff changeset
248 }
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diff changeset
249
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diff changeset
250 /**
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diff changeset
251 * Determines if a value read from a {@code final} instance field is considered constant. The
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diff changeset
252 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is
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diff changeset
253 * not the {@link JavaConstant#isDefaultForKind default value} for its kind or if
22758
a130b51efb07 removed @Option mechanism from JVMCI (GRAAL-1371)
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parents: 22757
diff changeset
254 * {@link #TrustFinalDefaultFields} is true.
21552
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255 *
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256 * @param value a value read from a {@code final} instance field
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257 * @param receiverClass the {@link Object#getClass() class} of object from which the
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258 * {@code value} was read
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259 */
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260 protected boolean isFinalInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) {
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261 return !value.isDefaultForKind() || TrustFinalDefaultFields;
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262 }
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263
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264 /**
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265 * Determines if a value read from a {@link Stable} instance field is considered constant. The
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266 * implementation in {@link HotSpotConstantReflectionProvider} returns true if {@code value} is
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267 * not the {@link JavaConstant#isDefaultForKind default value} for its kind.
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268 *
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269 * @param value a value read from a {@link Stable} field
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270 * @param receiverClass the {@link Object#getClass() class} of object from which the
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271 * {@code value} was read
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272 */
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273 protected boolean isStableInstanceFieldValueConstant(JavaConstant value, Class<?> receiverClass) {
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274 return !value.isDefaultForKind();
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275 }
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276
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277 public JavaConstant readConstantFieldValue(ResolvedJavaField field, JavaConstant receiver) {
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278 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
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279
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280 if (hotspotField.isStatic()) {
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281 if (isStaticFieldConstant(hotspotField)) {
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282 JavaConstant value = readFieldValue(field, receiver);
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283 if (hotspotField.isFinal() || !value.isDefaultForKind()) {
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284 return value;
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285 }
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286 }
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287 } else {
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288 /*
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289 * for non-static final fields, we must assume that they are only initialized if they
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290 * have a non-default value.
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291 */
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292 Object object = receiver.isNull() ? null : ((HotSpotObjectConstantImpl) receiver).object();
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293
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294 // Canonicalization may attempt to process an unsafe read before
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295 // processing a guard (e.g. a null check or a type check) for this read
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296 // so we need to check the object being read
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297 if (object != null) {
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298 if (hotspotField.isFinal()) {
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299 if (hotspotField.isInObject(object)) {
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300 JavaConstant value = readFieldValue(field, receiver);
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301 if (isFinalInstanceFieldValueConstant(value, object.getClass())) {
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302 return value;
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303 }
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304 }
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305 } else if (hotspotField.isStable() && runtime.getConfig().foldStableValues) {
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306 if (hotspotField.isInObject(object)) {
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307 JavaConstant value = readFieldValue(field, receiver);
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308 if (isStableInstanceFieldValueConstant(value, object.getClass())) {
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309 return value;
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310 }
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311 }
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312 }
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313 }
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314 }
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315 return null;
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316 }
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317
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318 public JavaConstant readFieldValue(ResolvedJavaField field, JavaConstant receiver) {
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319 HotSpotResolvedJavaField hotspotField = (HotSpotResolvedJavaField) field;
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320 if (!hotspotField.isStable()) {
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321 return readNonStableFieldValue(field, receiver);
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322 } else if (runtime.getConfig().foldStableValues) {
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323 return readStableFieldValue(field, receiver, hotspotField.isDefaultStable());
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324 } else {
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325 return null;
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326 }
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327 }
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328
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329 private JavaConstant readNonStableFieldValue(ResolvedJavaField 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.getJavaKind(), 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.getJavaKind(), 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(ResolvedJavaField 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 }