Mercurial > hg > graal-jvmci-8

annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/ResolvedJavaType.java @ 23393:1d4ce2d19e52

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clean up and minimize JVMCI (JDK-8156835)
author Doug Simon <doug.simon@oracle.com>
date Thu, 12 May 2016 20:57:31 +0200
parents ae27c683c128
children d6bd0b9cd0b6
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1 /*
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2 * Copyright (c) 2009, 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.meta;
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24
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25 import java.lang.reflect.AnnotatedElement;
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26
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27 import jdk.vm.ci.meta.Assumptions.AssumptionResult;
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28
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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, AnnotatedElement {
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35 /**
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36 * Checks whether this type has a finalizer method.
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37 *
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38 * @return {@code true} if this class has a finalizer
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39 */
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40 boolean hasFinalizer();
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41
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42 /**
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43 * Checks whether this type has any finalizable subclasses so far. Any decisions based on this
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44 * information require the registration of a dependency, since this information may change.
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45 *
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46 * @return {@code true} if this class has any subclasses with finalizers
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47 */
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48 AssumptionResult<Boolean> hasFinalizableSubclass();
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49
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50 /**
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51 * Checks whether this type is an interface.
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52 *
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53 * @return {@code true} if this type is an interface
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54 */
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55 boolean isInterface();
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56
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57 /**
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58 * Checks whether this type is an instance class.
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59 *
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60 * @return {@code true} if this type is an instance class
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61 */
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62 boolean isInstanceClass();
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63
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64 /**
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65 * Checks whether this type is primitive.
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66 *
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67 * @return {@code true} if this type is primitive
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68 */
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69 boolean isPrimitive();
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70
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71 /**
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72 * {@inheritDoc}
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73 * <p>
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74 * Only the flags specified in the JVM specification will be included in the returned mask. This
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75 * method is identical to {@link Class#getModifiers()} in terms of the value return for this
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76 * type.
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77 */
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78 int getModifiers();
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79
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80 /*
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81 * The setting of the final bit for types is a bit confusing since arrays are marked as final.
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82 * This method provides a semantically equivalent test that appropriate for types.
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83 */
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84 default boolean isLeaf() {
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85 return getElementalType().isFinalFlagSet();
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86 }
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87
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88 /**
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89 * Checks whether this type is initialized. If a type is initialized it implies that it was
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90 * {@link #isLinked() linked} and that the static initializer has run.
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91 *
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92 * @return {@code true} if this type is initialized
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93 */
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94 boolean isInitialized();
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95
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96 /**
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97 * Initializes this type.
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98 */
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99 void initialize();
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100
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101 /**
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102 * Checks whether this type is linked and verified. When a type is linked the static initializer
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103 * has not necessarily run. An {@link #isInitialized() initialized} type is always linked.
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104 *
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105 * @return {@code true} if this type is linked
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106 */
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107 boolean isLinked();
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108
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109 /**
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110 * Determines if this type is either the same as, or is a superclass or superinterface of, the
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111 * type represented by the specified parameter. This method is identical to
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112 * {@link Class#isAssignableFrom(Class)} in terms of the value return for this type.
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113 */
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114 boolean isAssignableFrom(ResolvedJavaType other);
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115
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116 /**
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117 * Returns true if this type is exactly the type {@link java.lang.Object}.
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118 */
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119 default boolean isJavaLangObject() {
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120 // Removed assertion due to https://bugs.eclipse.org/bugs/show_bug.cgi?id=434442
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121 return getSuperclass() == null && !isInterface() && getJavaKind() == JavaKind.Object;
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122 }
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123
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124 /**
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125 * Checks whether the specified object is an instance of this type.
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126 *
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127 * @param obj the object to test
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128 * @return {@code true} if the object is an instance of this type
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129 */
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130 boolean isInstance(JavaConstant obj);
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131
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132 /**
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133 * Gets the super class of this type. If this type represents either the {@code Object} class,
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134 * an interface, a primitive type, or void, then null is returned. If this object represents an
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135 * array class then the type object representing the {@code Object} class is returned.
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136 */
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137 ResolvedJavaType getSuperclass();
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138
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139 /**
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140 * Gets the interfaces implemented or extended by this type. This method is analogous to
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141 * {@link Class#getInterfaces()} and as such, only returns the interfaces directly implemented
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142 * or extended by this type.
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143 */
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144 ResolvedJavaType[] getInterfaces();
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145
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146 /**
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147 * Gets the single implementor of this type. Calling this method on a non-interface type causes
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148 * an exception.
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149 * <p>
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150 * If the compiler uses the result of this method for its compilation, the usage must be guarded
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151 * because the verifier can not guarantee that the assigned type really implements this
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152 * interface. Additionally, class loading can invalidate the result of this method.
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153 *
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154 * @return {@code null} if there is no implementor, the implementor if there is only one, or
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155 * {@code this} if there are more than one.
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156 */
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157 ResolvedJavaType getSingleImplementor();
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158
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159 /**
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160 * Walks the class hierarchy upwards and returns the least common class that is a superclass of
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161 * both the current and the given type.
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162 *
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163 * @return the least common type that is a super type of both the current and the given type, or
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164 * {@code null} if primitive types are involved.
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165 */
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166 ResolvedJavaType findLeastCommonAncestor(ResolvedJavaType otherType);
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167
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168 /**
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169 * Attempts to get a leaf concrete subclass of this type.
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170 * <p>
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171 * For an {@linkplain #isArray() array} type A, the leaf concrete subclass is A if the
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172 * {@linkplain #getElementalType() elemental} type of A is final (which includes primitive
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173 * types). Otherwise {@code null} is returned for A.
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174 * <p>
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175 * For a non-array type T, the result is the leaf concrete type in the current hierarchy of T.
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176 * <p>
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177 * A runtime may decide not to manage or walk a large hierarchy and so the result is
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178 * conservative. That is, a non-null result is guaranteed to be the leaf concrete class in T's
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179 * hierarchy <b>at the current point in time</b> but a null result does not necessarily imply
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180 * that there is no leaf concrete class in T's hierarchy.
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181 * <p>
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182 * If the compiler uses the result of this method for its compilation, it must register the
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183 * {@link AssumptionResult} in its {@link Assumptions} because dynamic class loading can
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184 * invalidate the result of this method.
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185 *
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186 * @return an {@link AssumptionResult} containing the leaf concrete subclass for this type as
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187 * described above
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188 */
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189 AssumptionResult<ResolvedJavaType> findLeafConcreteSubtype();
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190
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191 ResolvedJavaType getComponentType();
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192
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193 default ResolvedJavaType getElementalType() {
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194 ResolvedJavaType t = this;
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195 while (t.isArray()) {
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196 t = t.getComponentType();
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197 }
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198 return t;
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199 }
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200
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201 ResolvedJavaType getArrayClass();
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202
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203 /**
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204 * Resolves the method implementation for virtual dispatches on objects of this dynamic type.
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205 * This resolution process only searches "up" the class hierarchy of this type. A broader search
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206 * that also walks "down" the hierarchy is implemented by
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207 * {@link #findUniqueConcreteMethod(ResolvedJavaMethod)}. For interface types it returns null
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208 * since no concrete object can be an interface.
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209 *
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210 * @param method the method to select the implementation of
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211 * @param callerType the caller or context type used to perform access checks
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212 * @return the method that would be selected at runtime (might be abstract) or {@code null} if
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213 * it can not be resolved
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214 */
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215 ResolvedJavaMethod resolveMethod(ResolvedJavaMethod method, ResolvedJavaType callerType);
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216
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217 /**
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218 * A convenience wrapper for {@link #resolveMethod(ResolvedJavaMethod, ResolvedJavaType)} that
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219 * only returns non-abstract methods.
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220 *
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221 * @param method the method to select the implementation of
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222 * @param callerType the caller or context type used to perform access checks
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223 * @return the concrete method that would be selected at runtime, or {@code null} if there is no
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224 * concrete implementation of {@code method} in this type or any of its superclasses
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225 */
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226 default ResolvedJavaMethod resolveConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType callerType) {
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227 ResolvedJavaMethod resolvedMethod = resolveMethod(method, callerType);
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228 if (resolvedMethod == null || resolvedMethod.isAbstract()) {
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229 return null;
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230 }
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231 return resolvedMethod;
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232 }
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233
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234 /**
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235 * Given a {@link ResolvedJavaMethod} A, returns a concrete {@link ResolvedJavaMethod} B that is
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236 * the only possible unique target for a virtual call on A(). Returns {@code null} if either no
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237 * such concrete method or more than one such method exists. Returns the method A if A is a
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238 * concrete method that is not overridden.
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239 * <p>
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240 * If the compiler uses the result of this method for its compilation, it must register an
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241 * assumption because dynamic class loading can invalidate the result of this method.
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242 *
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243 * @param method the method A for which a unique concrete target is searched
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244 * @return the unique concrete target or {@code null} if no such target exists or assumptions
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245 * are not supported by this runtime
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246 */
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247 AssumptionResult<ResolvedJavaMethod> findUniqueConcreteMethod(ResolvedJavaMethod method);
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248
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249 /**
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250 * Returns the instance fields of this class, including
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251 * {@linkplain ResolvedJavaField#isInternal() internal} fields. A zero-length array is returned
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252 * for array and primitive types. The order of fields returned by this method is stable. That
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253 * is, for a single JVM execution the same order is returned each time this method is called. It
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254 * is also the "natural" order, which means that the JVM would expect the fields in this order
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255 * if no specific order is given.
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256 *
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257 * @param includeSuperclasses if true, then instance fields for the complete hierarchy of this
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258 * type are included in the result
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259 * @return an array of instance fields
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260 */
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261 ResolvedJavaField[] getInstanceFields(boolean includeSuperclasses);
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262
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263 /**
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264 * Returns the static fields of this class, including {@linkplain ResolvedJavaField#isInternal()
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265 * internal} fields. A zero-length array is returned for array and primitive types. The order of
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266 * fields returned by this method is stable. That is, for a single JVM execution the same order
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267 * is returned each time this method is called.
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268 */
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269 ResolvedJavaField[] getStaticFields();
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270
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271 /**
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272 * Returns the instance field of this class (or one of its super classes) at the given offset,
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273 * or {@code null} if there is no such field.
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274 *
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275 * @param offset the offset of the field to look for
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276 * @return the field with the given offset, or {@code null} if there is no such field.
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277 */
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278 ResolvedJavaField findInstanceFieldWithOffset(long offset, JavaKind expectedKind);
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279
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280 /**
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281 * Returns name of source file of this type.
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282 */
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283 String getSourceFileName();
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284
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285 /**
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286 * Returns {@code true} if the type is a local type.
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287 */
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288 boolean isLocal();
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289
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290 /**
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291 * Returns {@code true} if the type is a member type.
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292 */
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293 boolean isMember();
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294
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295 /**
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296 * Returns the enclosing type of this type, if it exists, or {@code null}.
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297 */
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298 ResolvedJavaType getEnclosingType();
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299
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300 /**
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301 * Returns an array reflecting all the constructors declared by this type. This method is
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302 * similar to {@link Class#getDeclaredConstructors()} in terms of returned constructors.
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303 */
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304 ResolvedJavaMethod[] getDeclaredConstructors();
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305
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306 /**
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307 * Returns an array reflecting all the methods declared by this type. This method is similar to
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308 * {@link Class#getDeclaredMethods()} in terms of returned methods.
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309 */
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310 ResolvedJavaMethod[] getDeclaredMethods();
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311
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312 /**
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313 * Returns the {@code <clinit>} method for this class if there is one.
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314 */
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315 ResolvedJavaMethod getClassInitializer();
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316
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317 default ResolvedJavaMethod findMethod(String name, Signature signature) {
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318 for (ResolvedJavaMethod method : getDeclaredMethods()) {
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319 if (method.getName().equals(name) && method.getSignature().equals(signature)) {
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320 return method;
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321 }
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322 }
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323 return null;
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324 }
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325
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326 /**
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327 * Returns true if this type is {@link Cloneable} and can be safely cloned by creating a normal
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328 * Java allocation and populating it from the fields returned by
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329 * {@link #getInstanceFields(boolean)}. Some types may require special handling by the platform
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330 * so they would to go through the normal {@link Object#clone} path.
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331 */
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332 boolean isCloneableWithAllocation();
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333 }