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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotResolvedJavaFieldImpl.java @ 19005:a64863622854

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Shorter comparison of HotSpotResolvedFieldImpl instances.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 28 Jan 2015 12:03:00 +0100
parents 7f4cb7587f4c
children 0d7302ddcc90
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1 /*
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2 * Copyright (c) 2011, 2014, 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.meta;
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24
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25 import static com.oracle.graal.compiler.common.GraalOptions.*;
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26 import static com.oracle.graal.hotspot.HotSpotGraalRuntime.*;
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27 import static com.oracle.graal.hotspot.meta.HotSpotResolvedObjectTypeImpl.*;
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28
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29 import java.lang.annotation.*;
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30 import java.lang.reflect.*;
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31
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32 import com.oracle.graal.api.meta.*;
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33 import com.oracle.graal.compiler.common.*;
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34 import com.oracle.graal.hotspot.*;
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35
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36 /**
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37 * Represents a field in a HotSpot type.
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38 */
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39 public class HotSpotResolvedJavaFieldImpl extends CompilerObject implements HotSpotResolvedJavaField, HotSpotProxified {
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40
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41 private static final long serialVersionUID = 7692985878836955683L;
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42 private final HotSpotResolvedObjectTypeImpl holder;
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43 private final String name;
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44 private JavaType type;
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45 private final int offset;
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46
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47 /**
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48 * This value contains all flags as stored in the VM including internal ones.
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49 */
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50 private final int modifiers;
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51
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52 public HotSpotResolvedJavaFieldImpl(HotSpotResolvedObjectTypeImpl holder, String name, JavaType type, long offset, int modifiers) {
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53 this.holder = holder;
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54 this.name = name;
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55 this.type = type;
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56 assert offset != -1;
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57 assert offset == (int) offset : "offset larger than int";
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58 this.offset = (int) offset;
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59 this.modifiers = modifiers;
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60 }
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61
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62 @Override
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63 public boolean equals(Object obj) {
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64 if (this == obj) {
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65 return true;
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66 }
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67 if (obj instanceof HotSpotResolvedJavaField) {
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68 HotSpotResolvedJavaFieldImpl that = (HotSpotResolvedJavaFieldImpl) obj;
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69 if (that.offset != this.offset) {
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70 return false;
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71 } else if (this.holder.equals(that.holder)) {
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72 assert this.name.equals(that.name) && this.type.equals(that.type);
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73 return true;
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74 }
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75 }
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76 return false;
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77 }
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78
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79 @Override
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80 public int hashCode() {
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81 return name.hashCode();
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82 }
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83
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84 @Override
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85 public int getModifiers() {
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86 return modifiers & getReflectionFieldModifiers();
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87 }
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88
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89 @Override
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90 public boolean isInternal() {
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91 return (modifiers & runtime().getConfig().jvmAccFieldInternal) != 0;
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92 }
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93
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94 /**
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95 * Determines if a given object contains this field.
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96 *
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97 * @return true iff this is a non-static field and its declaring class is assignable from
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98 * {@code object}'s class
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99 */
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100 public boolean isInObject(Object object) {
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101 if (isStatic()) {
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102 return false;
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103 }
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104 return getDeclaringClass().isAssignableFrom(HotSpotResolvedObjectTypeImpl.fromObjectClass(object.getClass()));
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105 }
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106
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107 @Override
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108 public HotSpotResolvedObjectTypeImpl getDeclaringClass() {
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109 return holder;
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110 }
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111
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112 @Override
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113 public String getName() {
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114 return name;
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115 }
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116
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117 @Override
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118 public JavaType getType() {
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119 if (!(type instanceof ResolvedJavaType)) {
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120 // Don't allow unresolved types to hang around forever
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121 ResolvedJavaType resolved = type.resolve(holder);
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122 if (resolved != null) {
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123 type = resolved;
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124 }
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125 }
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126 return type;
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127 }
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128
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129 public int offset() {
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130 return offset;
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131 }
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132
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133 @Override
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134 public String toString() {
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135 return format("HotSpotField<%H.%n %t:") + offset + ">";
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136 }
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137
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138 @Override
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139 public boolean isSynthetic() {
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140 return (runtime().getConfig().syntheticFlag & modifiers) != 0;
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141 }
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142
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143 /**
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144 * Checks if this field has the {@link Stable} annotation.
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145 *
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146 * @return true if field has {@link Stable} annotation, false otherwise
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147 */
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148 public boolean isStable() {
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149 if ((runtime().getConfig().jvmAccFieldStable & modifiers) != 0) {
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150 return true;
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151 }
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152 assert getAnnotation(Stable.class) == null;
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153 if (ImplicitStableValues.getValue() && isImplicitStableField()) {
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154 return true;
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155 }
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156 return false;
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157 }
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158
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159 @Override
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160 public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
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161 Field javaField = toJava();
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162 if (javaField != null) {
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163 return javaField.getAnnotation(annotationClass);
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164 }
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165 return null;
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166 }
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167
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168 private Field toJava() {
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169 if (isInternal()) {
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170 return null;
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171 }
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172 try {
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173 return holder.mirror().getDeclaredField(name);
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174 } catch (NoSuchFieldException e) {
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175 return null;
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176 }
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177 }
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178
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179 private boolean isArray() {
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180 JavaType fieldType = getType();
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181 return fieldType instanceof ResolvedJavaType && ((ResolvedJavaType) fieldType).isArray();
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182 }
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183
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184 private boolean isImplicitStableField() {
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185 if (isSynthetic()) {
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186 if (isSyntheticImplicitStableField()) {
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187 return true;
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188 }
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189 } else if (isWellKnownImplicitStableField()) {
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190 return true;
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191 }
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192 return false;
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193 }
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194
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195 private boolean isSyntheticImplicitStableField() {
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196 assert this.isSynthetic();
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197 if (isStatic() && isArray()) {
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198 if (isFinal() && name.equals("$VALUES") || name.equals("ENUM$VALUES")) {
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199 // generated int[] field for EnumClass::values()
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200 return true;
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201 } else if (name.startsWith("$SwitchMap$") || name.startsWith("$SWITCH_TABLE$")) {
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202 // javac and ecj generate a static field in an inner class for a switch on an enum
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203 // named $SwitchMap$p$k$g$EnumClass and $SWITCH_TABLE$p$k$g$EnumClass, respectively
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204 return true;
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205 }
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206 }
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207 return false;
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208 }
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209
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210 private boolean isWellKnownImplicitStableField() {
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211 return WellKnownImplicitStableField.test(this);
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212 }
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213
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214 static class WellKnownImplicitStableField {
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215 /**
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216 * @return {@code true} if the field is a well-known stable field.
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217 */
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218 public static boolean test(HotSpotResolvedJavaField field) {
18583
12bd2b344b08 replace usages of == with .equals()
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parents: 18530
diff changeset
219 return field.equals(STRING_VALUE_FIELD);
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220 }
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221
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222 private static final ResolvedJavaField STRING_VALUE_FIELD;
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223 static {
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diff changeset
224 try {
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diff changeset
225 MetaAccessProvider metaAccess = runtime().getHostProviders().getMetaAccess();
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226 STRING_VALUE_FIELD = metaAccess.lookupJavaField(String.class.getDeclaredField("value"));
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diff changeset
227 } catch (SecurityException | NoSuchFieldException e) {
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228 throw new GraalInternalError(e);
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229 }
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230 }
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diff changeset
231 }
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diff changeset
232 }