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annotate graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/ResolvedJavaType.java @ 18950:3fc907b46313

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[SPARC] Fix Partial Escape Analysis for SPARC in Truffle
author Stefan Anzinger <stefan.anzinger@oracle.com>
date Mon, 26 Jan 2015 21:21:06 +0100
parents a2ec2beb3f08
children 3362ba500371
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1 /*
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2 * Copyright (c) 2009, 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.api.meta;
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24
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25 import java.lang.annotation.*;
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26 import java.net.*;
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27
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28 /**
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29 * Represents a resolved Java type. Types include primitives, objects, {@code void}, and arrays
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30 * thereof. Types, like fields and methods, are resolved through {@link ConstantPool constant pools}
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31 * .
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32 */
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33 public interface ResolvedJavaType extends JavaType, ModifiersProvider {
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34
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35 /**
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36 * Gets the runtime representation of the Java class object of this type.
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37 */
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38 JavaConstant getJavaClass();
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39
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40 /**
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41 * Gets the runtime representation of the "hub" of this type--that is, the closest part of the
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42 * type representation which is typically stored in the object header.
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43 */
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44 Constant getObjectHub();
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45
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46 /**
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47 * Checks whether this type has a finalizer method.
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48 *
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49 * @return {@code true} if this class has a finalizer
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50 */
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51 boolean hasFinalizer();
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52
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53 /**
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54 * Checks whether this type has any finalizable subclasses so far. Any decisions based on this
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55 * information require the registration of a dependency, since this information may change.
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56 *
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57 * @return {@code true} if this class has any subclasses with finalizers
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58 */
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59 boolean hasFinalizableSubclass();
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60
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61 /**
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62 * Checks whether this type is an interface.
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63 *
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64 * @return {@code true} if this type is an interface
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65 */
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66 boolean isInterface();
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67
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68 /**
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69 * Checks whether this type is an instance class.
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70 *
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71 * @return {@code true} if this type is an instance class
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72 */
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73 boolean isInstanceClass();
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74
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75 /**
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76 * Checks whether this type is an array class.
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77 *
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78 * @return {@code true} if this type is an array class
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79 */
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80 boolean isArray();
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81
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82 /**
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83 * Checks whether this type is primitive.
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84 *
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85 * @return {@code true} if this type is primitive
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86 */
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87 boolean isPrimitive();
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88
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89 /**
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90 * {@inheritDoc}
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91 * <p>
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92 * Only the flags specified in the JVM specification will be included in the returned mask. This
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93 * method is identical to {@link Class#getModifiers()} in terms of the value return for this
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94 * type.
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95 */
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96 int getModifiers();
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97
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98 /**
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99 * Checks whether this type is initialized. If a type is initialized it implies that it was
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100 * {@link #isLinked() linked} and that the static initializer has run.
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101 *
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102 * @return {@code true} if this type is initialized
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103 */
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104 boolean isInitialized();
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105
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106 /**
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107 * Initializes this type.
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108 */
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109 void initialize();
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110
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111 /**
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112 * Checks whether this type is linked and verified. When a type is linked the static initializer
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113 * has not necessarily run. An {@link #isInitialized() initialized} type is always linked.
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114 *
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115 * @return {@code true} if this type is linked
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116 */
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117 boolean isLinked();
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118
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119 /**
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120 * Determines if this type is either the same as, or is a superclass or superinterface of, the
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121 * type represented by the specified parameter. This method is identical to
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122 * {@link Class#isAssignableFrom(Class)} in terms of the value return for this type.
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123 */
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124 boolean isAssignableFrom(ResolvedJavaType other);
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125
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126 /**
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127 * Returns true if this type is exactly the type {@link java.lang.Object}.
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128 */
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129 default boolean isJavaLangObject() {
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130 // Removed assertion due to https://bugs.eclipse.org/bugs/show_bug.cgi?id=434442
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131 return getSuperclass() == null && !isInterface() && getKind() == Kind.Object;
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132 }
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133
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134 /**
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135 * Checks whether the specified object is an instance of this type.
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136 *
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137 * @param obj the object to test
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138 * @return {@code true} if the object is an instance of this type
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139 */
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140 boolean isInstance(JavaConstant obj);
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141
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142 /**
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143 * Returns this type if it is an exact type otherwise returns null. This type is exact if it is
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144 * void, primitive, final, or an array of a final or primitive type.
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145 *
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146 * @return this type if it is exact; {@code null} otherwise
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147 */
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148 ResolvedJavaType asExactType();
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149
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150 /**
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151 * Gets the super class of this type. If this type represents either the {@code Object} class,
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152 * an interface, a primitive type, or void, then null is returned. If this object represents an
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153 * array class then the type object representing the {@code Object} class is returned.
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154 */
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155 ResolvedJavaType getSuperclass();
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156
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157 /**
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158 * Gets the interfaces implemented or extended by this type. This method is analogous to
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159 * {@link Class#getInterfaces()} and as such, only returns the interfaces directly implemented
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160 * or extended by this type.
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161 */
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162 ResolvedJavaType[] getInterfaces();
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163
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164 /**
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165 * Gets the single implementor of this type. Calling this method on a non-interface type causes
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166 * an exception.
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167 * <p>
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168 * If the compiler uses the result of this method for its compilation, the usage must be guarded
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169 * because the verifier can not guarantee that the assigned type really implements this
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170 * interface. Additionally, class loading can invalidate the result of this method.
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171 *
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172 * @return {@code null} if there is no implementor, the implementor if there is only one, or
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173 * {@code this} if there are more than one.
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174 */
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175 ResolvedJavaType getSingleImplementor();
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176
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177 /**
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178 * Walks the class hierarchy upwards and returns the least common class that is a superclass of
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179 * both the current and the given type.
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180 *
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181 * @return the least common type that is a super type of both the current and the given type, or
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182 * {@code null} if primitive types are involved.
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183 */
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184 ResolvedJavaType findLeastCommonAncestor(ResolvedJavaType otherType);
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185
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186 /**
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187 * Attempts to get a unique concrete subclass of this type.
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188 * <p>
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189 * For an {@linkplain #isArray() array} type A, the unique concrete subclass is A if the
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190 * {@linkplain #getElementalType() elemental} type of A is final (which includes primitive
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191 * types). Otherwise {@code null} is returned for A.
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192 * <p>
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193 * For a non-array type T, the result is the unique concrete type in the current hierarchy of T.
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194 * <p>
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195 * A runtime may decide not to manage or walk a large hierarchy and so the result is
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196 * conservative. That is, a non-null result is guaranteed to be the unique concrete class in T's
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197 * hierarchy <b>at the current point in time</b> but a null result does not necessarily imply
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198 * that there is no unique concrete class in T's hierarchy.
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199 * <p>
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200 * If the compiler uses the result of this method for its compilation, it must register an
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201 * assumption because dynamic class loading can invalidate the result of this method.
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202 *
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203 * @return the unique concrete subclass for this type as described above
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204 */
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205 ResolvedJavaType findUniqueConcreteSubtype();
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206
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207 ResolvedJavaType getComponentType();
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208
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209 default ResolvedJavaType getElementalType() {
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210 ResolvedJavaType t = this;
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211 while (t.isArray()) {
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212 t = t.getComponentType();
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213 }
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214 return t;
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215 }
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216
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217 ResolvedJavaType getArrayClass();
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218
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219 /**
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220 * Resolves the method implementation for virtual dispatches on objects of this dynamic type.
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221 * This resolution process only searches "up" the class hierarchy of this type.
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222 *
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223 * @param method the method to select the implementation of
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224 * @param callerType the caller or context type used to perform access checks
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225 * @param includeAbstract whether abstract methods should be returned. If it is {@code false}
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226 * this method behaves like {@link #resolveConcreteMethod}. This is just a temporary
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227 * parameter to highlight the changed semantics of this method. TODO (je) remove this
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228 * flag.
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229 * @return the link-time resolved method (might be abstract) or {@code null} if it can not be
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230 * linked
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231 */
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232 ResolvedJavaMethod resolveMethod(ResolvedJavaMethod method, ResolvedJavaType callerType, boolean includeAbstract);
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233
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234 /**
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235 * Resolves the method implementation for virtual dispatches on objects of this dynamic type.
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236 * This resolution process only searches "up" the class hierarchy of this type. A broader search
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237 * that also walks "down" the hierarchy is implemented by
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238 * {@link #findUniqueConcreteMethod(ResolvedJavaMethod)}.
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239 *
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240 * @param method the method to select the implementation of
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241 * @param callerType the caller or context type used to perform access checks
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242 * @return the concrete method that would be selected at runtime, or {@code null} if there is no
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243 * concrete implementation of {@code method} in this type or any of its superclasses
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244 */
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245 ResolvedJavaMethod resolveConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType callerType);
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246
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247 /**
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248 * Given a {@link ResolvedJavaMethod} A, returns a concrete {@link ResolvedJavaMethod} B that is
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249 * the only possible unique target for a virtual call on A(). Returns {@code null} if either no
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250 * such concrete method or more than one such method exists. Returns the method A if A is a
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251 * concrete method that is not overridden.
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252 * <p>
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253 * If the compiler uses the result of this method for its compilation, it must register an
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254 * assumption because dynamic class loading can invalidate the result of this method.
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255 *
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256 * @param method the method A for which a unique concrete target is searched
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257 * @return the unique concrete target or {@code null} if no such target exists or assumptions
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258 * are not supported by this runtime
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259 */
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260 ResolvedJavaMethod findUniqueConcreteMethod(ResolvedJavaMethod method);
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261
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262 /**
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263 * Returns the instance fields of this class, including
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264 * {@linkplain ResolvedJavaField#isInternal() internal} fields. A zero-length array is returned
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265 * for array and primitive types. The order of fields returned by this method is stable. That
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266 * is, for a single JVM execution the same order is returned each time this method is called. It
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267 * is also the "natural" order, which means that the JVM would expect the fields in this order
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268 * if no specific order is given.
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269 *
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270 * @param includeSuperclasses if true, then instance fields for the complete hierarchy of this
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271 * type are included in the result
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272 * @return an array of instance fields
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273 */
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274 ResolvedJavaField[] getInstanceFields(boolean includeSuperclasses);
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275
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276 /**
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277 * Returns the static fields of this class, including
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278 * {@linkplain ResolvedJavaField#isInternal() internal} fields. A zero-length array is returned
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279 * for array and primitive types. The order of fields returned by this method is stable. That
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280 * is, for a single JVM execution the same order is returned each time this method is called.
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281 */
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282 ResolvedJavaField[] getStaticFields();
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283
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284 /**
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285 * Returns the annotation for the specified type of this class, if such an annotation is
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286 * present.
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287 *
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288 * @param annotationClass the Class object corresponding to the annotation type
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289 * @return this element's annotation for the specified annotation type if present on this class,
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290 * else {@code null}
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291 */
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292 <T extends Annotation> T getAnnotation(Class<T> annotationClass);
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293
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294 /**
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295 * Returns the instance field of this class (or one of its super classes) at the given offset,
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296 * or {@code null} if there is no such field.
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297 *
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298 * @param offset the offset of the field to look for
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299 * @return the field with the given offset, or {@code null} if there is no such field.
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300 */
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301 ResolvedJavaField findInstanceFieldWithOffset(long offset, Kind expectedKind);
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302
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303 /**
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304 * Returns name of source file of this type.
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305 */
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306 String getSourceFileName();
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307
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308 /**
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309 * Returns the class file path - if available - of this type, or {@code null}.
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310 */
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311 URL getClassFilePath();
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312
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313 /**
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314 * Returns {@code true} if the type is a local type.
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315 */
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316 boolean isLocal();
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317
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318 /**
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319 * Returns {@code true} if the type is a member type.
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320 */
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321 boolean isMember();
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322
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323 /**
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324 * Returns the enclosing type of this type, if it exists, or {@code null}.
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325 */
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326 ResolvedJavaType getEnclosingType();
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327
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328 /**
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329 * Returns an array reflecting all the constructors declared by this type. This method is
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330 * similar to {@link Class#getDeclaredConstructors()} in terms of returned constructors.
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331 */
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332 ResolvedJavaMethod[] getDeclaredConstructors();
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333
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334 /**
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335 * Returns an array reflecting all the methods declared by this type. This method is similar to
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336 * {@link Class#getDeclaredMethods()} in terms of returned methods.
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337 */
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338 ResolvedJavaMethod[] getDeclaredMethods();
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339
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340 /**
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341 * Returns the {@code <clinit>} method for this class if there is one.
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342 */
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343 ResolvedJavaMethod getClassInitializer();
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344
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345 /**
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346 * Returns true if this type represents and interface and it should be trusted even in places
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347 * where the JVM verifier would not give any guarantees other than {@link Object}.
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348 */
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349 boolean isTrustedInterfaceType();
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350 }