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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/ResolvedJavaType.java @ 15311:820c6d353358

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added ModifiersProvider as superinterface for ResolvedJava[Method|Field|Type] and implemented all checks against modifiers as default methods
author Doug Simon <doug.simon@oracle.com>
date Wed, 23 Apr 2014 12:38:05 +0200
parents c0807f5fdca5
children c583759bbcfd
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1 /*
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2 * Copyright (c) 2009, 2013, 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.api.meta;
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24
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25 import java.lang.annotation.*;
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26 import java.lang.reflect.*;
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27 import java.net.*;
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29 /**
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30 * Represents a resolved Java type. Types include primitives, objects, {@code void}, and arrays
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31 * thereof. Types, like fields and methods, are resolved through {@link ConstantPool constant pools}
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32 * .
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33 */
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34 public interface ResolvedJavaType extends JavaType, ModifiersProvider {
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35
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36 /**
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37 * Represents each of the several different parts of the runtime representation of a type which
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38 * compiled code may need to reference individually. These may or may not be different objects
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39 * or data structures, depending on the runtime system.
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40 */
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41 public enum Representation {
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42 /**
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43 * The runtime representation of the Java class object of this type.
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44 */
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45 JavaClass,
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46
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47 /**
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48 * The runtime representation of the "hub" of this type--that is, the closest part of the
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49 * type representation which is typically stored in the object header.
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50 */
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51 ObjectHub
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52 }
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53
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54 /**
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55 * Gets the encoding of (that is, a constant representing the value of) the specified part of
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56 * this type.
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57 *
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58 * @param r the part of this type
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59 * @return a constant representing a reference to the specified part of this type
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60 */
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61 Constant getEncoding(Representation r);
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62
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63 /**
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64 * Checks whether this type has a finalizer method.
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65 *
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66 * @return {@code true} if this class has a finalizer
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67 */
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68 boolean hasFinalizer();
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69
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70 /**
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71 * Checks whether this type has any finalizable subclasses so far. Any decisions based on this
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72 * information require the registration of a dependency, since this information may change.
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73 *
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74 * @return {@code true} if this class has any subclasses with finalizers
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75 */
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76 boolean hasFinalizableSubclass();
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77
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78 /**
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79 * Checks whether this type is an interface.
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80 *
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81 * @return {@code true} if this type is an interface
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82 */
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83 boolean isInterface();
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84
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85 /**
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86 * Checks whether this type is an instance class.
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87 *
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88 * @return {@code true} if this type is an instance class
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89 */
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90 boolean isInstanceClass();
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91
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92 /**
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93 * Checks whether this type is an array class.
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94 *
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95 * @return {@code true} if this type is an array class
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96 */
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97 boolean isArray();
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98
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99 /**
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100 * Checks whether this type is primitive.
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101 *
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102 * @return {@code true} if this type is primitive
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103 */
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104 boolean isPrimitive();
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105
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106 /**
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107 * {@inheritDoc}
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108 * <p>
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109 * Only the flags specified in the JVM specification will be included in the returned mask. This
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110 * method is identical to {@link Class#getModifiers()} in terms of the value return for this
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111 * type.
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112 */
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113 int getModifiers();
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114
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115 /**
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116 * Checks whether this type is initialized. If a type is initialized it implies that it was
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117 * {@link #isLinked() linked} and that the static initializer has run.
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118 *
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119 * @return {@code true} if this type is initialized
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120 */
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121 boolean isInitialized();
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122
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123 /**
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124 * Initializes this type.
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125 */
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126 void initialize();
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127
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128 /**
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129 * Checks whether this type is linked and verified. When a type is linked the static initializer
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130 * has not necessarily run. An {@link #isInitialized() initialized} type is always linked.
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131 *
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132 * @return {@code true} if this type is linked
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133 */
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134 boolean isLinked();
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135
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136 /**
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137 * Determines if this type is either the same as, or is a superclass or superinterface of, the
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138 * type represented by the specified parameter. This method is identical to
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139 * {@link Class#isAssignableFrom(Class)} in terms of the value return for this type.
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140 */
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141 boolean isAssignableFrom(ResolvedJavaType other);
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142
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143 /**
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144 * Checks whether the specified object is an instance of this type.
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145 *
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146 * @param obj the object to test
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147 * @return {@code true} if the object is an instance of this type
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148 */
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149 boolean isInstance(Constant obj);
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150
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151 /**
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152 * Returns this type if it is an exact type otherwise returns null. This type is exact if it is
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153 * void, primitive, final, or an array of a final or primitive type.
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154 *
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155 * @return this type if it is exact; {@code null} otherwise
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156 */
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157 ResolvedJavaType asExactType();
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158
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159 /**
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160 * Gets the super class of this type. If this type represents either the {@code Object} class, a
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161 * primitive type, or void, then null is returned. If this object represents an array class or
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162 * an interface then the type object representing the {@code Object} class is returned.
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163 */
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164 ResolvedJavaType getSuperclass();
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165
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166 /**
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167 * Gets the interfaces implemented or extended by this type. This method is analogous to
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168 * {@link Class#getInterfaces()} and as such, only returns the interfaces directly implemented
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169 * or extended by this type.
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170 */
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171 ResolvedJavaType[] getInterfaces();
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172
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173 /**
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174 * Walks the class hierarchy upwards and returns the least common class that is a superclass of
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175 * both the current and the given type.
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176 *
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177 * @return the least common type that is a super type of both the current and the given type, or
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178 * {@code null} if primitive types are involved.
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179 */
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180 ResolvedJavaType findLeastCommonAncestor(ResolvedJavaType otherType);
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181
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182 /**
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183 * Attempts to get a unique concrete subclass of this type.
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184 * <p>
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185 * For an {@linkplain #isArray() array} type A, the unique concrete subclass is A if the
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186 * {@linkplain MetaUtil#getElementalType(ResolvedJavaType) elemental} type of A is final (which
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187 * includes primitive types). Otherwise {@code null} is returned for A.
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188 * <p>
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189 * For a non-array type T, the result is the unique concrete type in the current hierarchy of T.
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190 * <p>
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191 * A runtime may decide not to manage or walk a large hierarchy and so the result is
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192 * conservative. That is, a non-null result is guaranteed to be the unique concrete class in T's
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193 * hierarchy <b>at the current point in time</b> but a null result does not necessarily imply
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194 * that there is no unique concrete class in T's hierarchy.
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195 * <p>
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196 * If the compiler uses the result of this method for its compilation, it must register an
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197 * assumption because dynamic class loading can invalidate the result of this method.
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198 *
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199 * @return the unique concrete subclass for this type as described above
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200 */
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201 ResolvedJavaType findUniqueConcreteSubtype();
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202
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203 ResolvedJavaType getComponentType();
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204
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205 ResolvedJavaType getArrayClass();
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206
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207 /**
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208 * Resolves the method implementation for virtual dispatches on objects of this dynamic type.
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209 * This resolution process only searches "up" the class hierarchy of this type. A broader search
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210 * that also walks "down" the hierarchy is implemented by
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211 * {@link #findUniqueConcreteMethod(ResolvedJavaMethod)}.
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212 *
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213 * @param method the method to select the implementation of
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214 * @return the concrete method that would be selected at runtime, or {@code null} if there is no
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215 * concrete implementation of {@code method} in this type or any of its superclasses
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216 */
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217 ResolvedJavaMethod resolveMethod(ResolvedJavaMethod method);
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218
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219 /**
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220 * Given a {@link ResolvedJavaMethod} A, returns a concrete {@link ResolvedJavaMethod} B that is
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221 * the only possible unique target for a virtual call on A(). Returns {@code null} if either no
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222 * such concrete method or more than one such method exists. Returns the method A if A is a
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223 * concrete method that is not overridden.
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224 * <p>
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225 * If the compiler uses the result of this method for its compilation, it must register an
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226 * assumption because dynamic class loading can invalidate the result of this method.
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227 *
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228 * @param method the method A for which a unique concrete target is searched
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229 * @return the unique concrete target or {@code null} if no such target exists or assumptions
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230 * are not supported by this runtime
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231 */
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232 ResolvedJavaMethod findUniqueConcreteMethod(ResolvedJavaMethod method);
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233
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234 /**
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235 * Returns the instance fields of this class, including
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236 * {@linkplain ResolvedJavaField#isInternal() internal} fields. A zero-length array is returned
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237 * for array and primitive types. The order of fields returned by this method is stable. That
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238 * is, for a single JVM execution the same order is returned each time this method is called. It
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239 * is also the "natural" order, which means that the JVM would expect the fields in this order
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240 * if no specific order is given.
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241 *
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242 * @param includeSuperclasses if true, then instance fields for the complete hierarchy of this
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243 * type are included in the result
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244 * @return an array of instance fields
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245 */
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246 ResolvedJavaField[] getInstanceFields(boolean includeSuperclasses);
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247
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248 /**
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249 * Returns the annotation for the specified type of this class, if such an annotation is
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250 * present.
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251 *
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252 * @param annotationClass the Class object corresponding to the annotation type
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253 * @return this element's annotation for the specified annotation type if present on this class,
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254 * else {@code null}
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255 */
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256 <T extends Annotation> T getAnnotation(Class<T> annotationClass);
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257
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258 /**
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259 * Returns the instance field of this class (or one of its super classes) at the given offset,
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260 * or {@code null} if there is no such field.
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261 *
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262 * @param offset the offset of the field to look for
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263 * @return the field with the given offset, or {@code null} if there is no such field.
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264 */
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265 ResolvedJavaField findInstanceFieldWithOffset(long offset);
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266
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267 /**
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268 * Returns name of source file of this type.
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269 */
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270 String getSourceFileName();
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271
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272 /**
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273 * Returns the class file path - if available - of this type, or {@code null}.
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274 */
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275 URL getClassFilePath();
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276
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277 /**
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278 * Returns {@code true} if the type is a local type.
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279 */
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280 boolean isLocal();
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281
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282 /**
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283 * Returns {@code true} if the type is a member type.
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284 */
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285 boolean isMember();
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286
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287 /**
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288 * Returns the enclosing type of this type, if it exists, or {@code null}.
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289 */
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290 ResolvedJavaType getEnclosingType();
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291
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292 /**
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293 * Returns an array reflecting all the constructors declared by this type. This method is
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294 * similar to {@link Class#getDeclaredConstructors()} in terms of returned constructors.
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295 */
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296 ResolvedJavaMethod[] getDeclaredConstructors();
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297
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298 /**
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299 * Returns an array reflecting all the methods declared by this type. This method is similar to
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300 * {@link Class#getDeclaredMethods()} in terms of returned methods.
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301 */
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302 ResolvedJavaMethod[] getDeclaredMethods();
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303
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304 /**
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305 * Returns the {@code <clinit>} method for this class if there is one.
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306 */
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307 ResolvedJavaMethod getClassInitializer();
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308
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309 /**
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310 * Creates a new array with this type as the component type and the specified length. This
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311 * method is similar to {@link Array#newInstance(Class, int)}.
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312 */
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313 Constant newArray(int length);
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314 }