Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/ResolvedJavaType.java @ 23357:b05ad394cfd5
Add ResolvedJavaType.isAllocationClonable
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 28 Apr 2016 13:07:46 -0700 |
parents | 7ae6a635fad0 |
children | 45168ac6d3bc |
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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.annotation.Annotation; |
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26 import java.net.URL; |
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27 |
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28 import jdk.vm.ci.meta.Assumptions.AssumptionResult; |
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29 |
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30 /** |
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31 * Represents a resolved Java type. Types include primitives, objects, {@code void}, and arrays |
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32 * thereof. Types, like fields and methods, are resolved through {@link ConstantPool constant pools} |
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33 * . |
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34 */ |
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35 public interface ResolvedJavaType extends JavaType, ModifiersProvider { |
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36 /** |
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37 * Checks whether this type has a finalizer method. |
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38 * |
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39 * @return {@code true} if this class has a finalizer |
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40 */ |
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41 boolean hasFinalizer(); |
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42 |
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43 /** |
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44 * Checks whether this type has any finalizable subclasses so far. Any decisions based on this |
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45 * information require the registration of a dependency, since this information may change. |
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46 * |
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47 * @return {@code true} if this class has any subclasses with finalizers |
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48 */ |
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49 AssumptionResult<Boolean> hasFinalizableSubclass(); |
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50 |
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51 /** |
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52 * Checks whether this type is an interface. |
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53 * |
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54 * @return {@code true} if this type is an interface |
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55 */ |
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56 boolean isInterface(); |
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57 |
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58 /** |
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59 * Checks whether this type is an instance class. |
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60 * |
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61 * @return {@code true} if this type is an instance class |
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62 */ |
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63 boolean isInstanceClass(); |
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64 |
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65 /** |
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66 * Checks whether this type is an array class. |
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67 * |
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68 * @return {@code true} if this type is an array class |
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69 */ |
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70 boolean isArray(); |
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71 |
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72 /** |
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73 * Checks whether this type is primitive. |
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74 * |
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75 * @return {@code true} if this type is primitive |
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76 */ |
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77 boolean isPrimitive(); |
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78 |
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79 /** |
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80 * {@inheritDoc} |
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81 * <p> |
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82 * Only the flags specified in the JVM specification will be included in the returned mask. This |
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83 * method is identical to {@link Class#getModifiers()} in terms of the value return for this |
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84 * type. |
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85 */ |
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86 int getModifiers(); |
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87 |
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88 /* |
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89 * The setting of the final bit for types is a bit confusing since arrays are marked as final. |
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90 * This method provides a semantically equivalent test that appropriate for types. |
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91 */ |
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92 default boolean isLeaf() { |
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93 return getElementalType().isFinalFlagSet(); |
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94 } |
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95 |
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96 /** |
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97 * Checks whether this type is initialized. If a type is initialized it implies that it was |
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98 * {@link #isLinked() linked} and that the static initializer has run. |
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99 * |
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100 * @return {@code true} if this type is initialized |
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101 */ |
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102 boolean isInitialized(); |
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103 |
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104 /** |
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105 * Initializes this type. |
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106 */ |
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107 void initialize(); |
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108 |
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109 /** |
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110 * Checks whether this type is linked and verified. When a type is linked the static initializer |
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111 * has not necessarily run. An {@link #isInitialized() initialized} type is always linked. |
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112 * |
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113 * @return {@code true} if this type is linked |
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114 */ |
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115 boolean isLinked(); |
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116 |
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117 /** |
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118 * Determines if this type is either the same as, or is a superclass or superinterface of, the |
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119 * type represented by the specified parameter. This method is identical to |
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120 * {@link Class#isAssignableFrom(Class)} in terms of the value return for this type. |
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121 */ |
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122 boolean isAssignableFrom(ResolvedJavaType other); |
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123 |
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124 /** |
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125 * Returns true if this type is exactly the type {@link java.lang.Object}. |
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126 */ |
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127 default boolean isJavaLangObject() { |
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128 // Removed assertion due to https://bugs.eclipse.org/bugs/show_bug.cgi?id=434442 |
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129 return getSuperclass() == null && !isInterface() && getJavaKind() == JavaKind.Object; |
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130 } |
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131 |
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132 /** |
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133 * Checks whether the specified object is an instance of this type. |
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134 * |
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135 * @param obj the object to test |
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136 * @return {@code true} if the object is an instance of this type |
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137 */ |
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138 boolean isInstance(JavaConstant obj); |
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139 |
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140 /** |
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141 * Gets the super class of this type. If this type represents either the {@code Object} class, |
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142 * an interface, a primitive type, or void, then null is returned. If this object represents an |
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143 * array class then the type object representing the {@code Object} class is returned. |
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144 */ |
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145 ResolvedJavaType getSuperclass(); |
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146 |
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147 /** |
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148 * Gets the interfaces implemented or extended by this type. This method is analogous to |
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149 * {@link Class#getInterfaces()} and as such, only returns the interfaces directly implemented |
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150 * or extended by this type. |
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151 */ |
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152 ResolvedJavaType[] getInterfaces(); |
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153 |
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154 /** |
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155 * Gets the single implementor of this type. Calling this method on a non-interface type causes |
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156 * an exception. |
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157 * <p> |
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158 * If the compiler uses the result of this method for its compilation, the usage must be guarded |
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159 * because the verifier can not guarantee that the assigned type really implements this |
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160 * interface. Additionally, class loading can invalidate the result of this method. |
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161 * |
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162 * @return {@code null} if there is no implementor, the implementor if there is only one, or |
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163 * {@code this} if there are more than one. |
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164 */ |
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165 ResolvedJavaType getSingleImplementor(); |
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166 |
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167 /** |
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168 * Walks the class hierarchy upwards and returns the least common class that is a superclass of |
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169 * both the current and the given type. |
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170 * |
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171 * @return the least common type that is a super type of both the current and the given type, or |
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172 * {@code null} if primitive types are involved. |
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173 */ |
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174 ResolvedJavaType findLeastCommonAncestor(ResolvedJavaType otherType); |
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175 |
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176 /** |
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177 * Attempts to get a leaf concrete subclass of this type. |
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178 * <p> |
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179 * For an {@linkplain #isArray() array} type A, the leaf concrete subclass is A if the |
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180 * {@linkplain #getElementalType() elemental} type of A is final (which includes primitive |
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181 * types). Otherwise {@code null} is returned for A. |
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182 * <p> |
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183 * For a non-array type T, the result is the leaf concrete type in the current hierarchy of T. |
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184 * <p> |
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185 * A runtime may decide not to manage or walk a large hierarchy and so the result is |
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186 * conservative. That is, a non-null result is guaranteed to be the leaf concrete class in T's |
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187 * hierarchy <b>at the current point in time</b> but a null result does not necessarily imply |
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188 * that there is no leaf concrete class in T's hierarchy. |
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189 * <p> |
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190 * If the compiler uses the result of this method for its compilation, it must register the |
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191 * {@link AssumptionResult} in its {@link Assumptions} because dynamic class loading can |
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192 * invalidate the result of this method. |
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193 * |
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194 * @return an {@link AssumptionResult} containing the leaf concrete subclass for this type as |
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195 * described above |
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196 */ |
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197 AssumptionResult<ResolvedJavaType> findLeafConcreteSubtype(); |
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198 |
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199 ResolvedJavaType getComponentType(); |
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200 |
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201 default ResolvedJavaType getElementalType() { |
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202 ResolvedJavaType t = this; |
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203 while (t.isArray()) { |
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204 t = t.getComponentType(); |
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205 } |
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206 return t; |
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207 } |
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208 |
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209 ResolvedJavaType getArrayClass(); |
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210 |
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211 /** |
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212 * Resolves the method implementation for virtual dispatches on objects of this dynamic type. |
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213 * This resolution process only searches "up" the class hierarchy of this type. A broader search |
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214 * that also walks "down" the hierarchy is implemented by |
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215 * {@link #findUniqueConcreteMethod(ResolvedJavaMethod)}. For interface types it returns null |
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216 * since no concrete object can be an interface. |
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217 * |
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218 * @param method the method to select the implementation of |
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219 * @param callerType the caller or context type used to perform access checks |
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220 * @return the method that would be selected at runtime (might be abstract) or {@code null} if |
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221 * it can not be resolved |
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222 */ |
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223 ResolvedJavaMethod resolveMethod(ResolvedJavaMethod method, ResolvedJavaType callerType); |
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224 |
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225 /** |
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226 * A convenience wrapper for {@link #resolveMethod(ResolvedJavaMethod, ResolvedJavaType)} that |
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227 * only returns non-abstract methods. |
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228 * |
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229 * @param method the method to select the implementation of |
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230 * @param callerType the caller or context type used to perform access checks |
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231 * @return the concrete method that would be selected at runtime, or {@code null} if there is no |
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232 * concrete implementation of {@code method} in this type or any of its superclasses |
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233 */ |
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234 default ResolvedJavaMethod resolveConcreteMethod(ResolvedJavaMethod method, ResolvedJavaType callerType) { |
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235 ResolvedJavaMethod resolvedMethod = resolveMethod(method, callerType); |
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236 if (resolvedMethod == null || resolvedMethod.isAbstract()) { |
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237 return null; |
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238 } |
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239 return resolvedMethod; |
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240 } |
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241 |
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242 /** |
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243 * Given a {@link ResolvedJavaMethod} A, returns a concrete {@link ResolvedJavaMethod} B that is |
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244 * the only possible unique target for a virtual call on A(). Returns {@code null} if either no |
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245 * such concrete method or more than one such method exists. Returns the method A if A is a |
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246 * concrete method that is not overridden. |
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247 * <p> |
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248 * If the compiler uses the result of this method for its compilation, it must register an |
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249 * assumption because dynamic class loading can invalidate the result of this method. |
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250 * |
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251 * @param method the method A for which a unique concrete target is searched |
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252 * @return the unique concrete target or {@code null} if no such target exists or assumptions |
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253 * are not supported by this runtime |
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254 */ |
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255 AssumptionResult<ResolvedJavaMethod> findUniqueConcreteMethod(ResolvedJavaMethod method); |
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256 |
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257 /** |
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258 * Returns the instance fields of this class, including |
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259 * {@linkplain ResolvedJavaField#isInternal() internal} fields. A zero-length array is returned |
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260 * for array and primitive types. The order of fields returned by this method is stable. That |
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261 * is, for a single JVM execution the same order is returned each time this method is called. It |
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262 * is also the "natural" order, which means that the JVM would expect the fields in this order |
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263 * if no specific order is given. |
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264 * |
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265 * @param includeSuperclasses if true, then instance fields for the complete hierarchy of this |
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266 * type are included in the result |
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267 * @return an array of instance fields |
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268 */ |
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269 ResolvedJavaField[] getInstanceFields(boolean includeSuperclasses); |
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270 |
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271 /** |
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272 * Returns the static fields of this class, including {@linkplain ResolvedJavaField#isInternal() |
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273 * internal} fields. A zero-length array is returned for array and primitive types. The order of |
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274 * fields returned by this method is stable. That is, for a single JVM execution the same order |
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275 * is returned each time this method is called. |
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276 */ |
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277 ResolvedJavaField[] getStaticFields(); |
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278 |
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279 /** |
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280 * Returns all annotations of this class. If no annotations are present, an array of length 0 is |
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281 * returned. |
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282 */ |
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283 Annotation[] getAnnotations(); |
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284 |
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285 /** |
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286 * Returns the annotation for the specified type of this class, if such an annotation is |
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287 * present. |
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288 * |
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289 * @param annotationClass the Class object corresponding to the annotation type |
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290 * @return this element's annotation for the specified annotation type if present on this class, |
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291 * else {@code null} |
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292 */ |
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293 <T extends Annotation> T getAnnotation(Class<T> annotationClass); |
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294 |
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295 /** |
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296 * Returns the instance field of this class (or one of its super classes) at the given offset, |
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297 * or {@code null} if there is no such field. |
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298 * |
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299 * @param offset the offset of the field to look for |
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300 * @return the field with the given offset, or {@code null} if there is no such field. |
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301 */ |
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302 ResolvedJavaField findInstanceFieldWithOffset(long offset, JavaKind expectedKind); |
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303 |
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304 /** |
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305 * Returns name of source file of this type. |
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306 */ |
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307 String getSourceFileName(); |
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308 |
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309 /** |
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310 * Returns the class file path - if available - of this type, or {@code null}. |
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311 */ |
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312 URL getClassFilePath(); |
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313 |
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314 /** |
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315 * Returns {@code true} if the type is a local type. |
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316 */ |
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317 boolean isLocal(); |
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318 |
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319 /** |
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320 * Returns {@code true} if the type is a member type. |
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321 */ |
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322 boolean isMember(); |
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323 |
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324 /** |
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325 * Returns the enclosing type of this type, if it exists, or {@code null}. |
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326 */ |
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327 ResolvedJavaType getEnclosingType(); |
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328 |
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329 /** |
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330 * Returns an array reflecting all the constructors declared by this type. This method is |
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331 * similar to {@link Class#getDeclaredConstructors()} in terms of returned constructors. |
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332 */ |
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333 ResolvedJavaMethod[] getDeclaredConstructors(); |
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334 |
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335 /** |
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336 * Returns an array reflecting all the methods declared by this type. This method is similar to |
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337 * {@link Class#getDeclaredMethods()} in terms of returned methods. |
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338 */ |
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339 ResolvedJavaMethod[] getDeclaredMethods(); |
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340 |
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341 /** |
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342 * Returns the {@code <clinit>} method for this class if there is one. |
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343 */ |
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344 ResolvedJavaMethod getClassInitializer(); |
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345 |
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346 /** |
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348 * where the JVM verifier would not give any guarantees other than {@link Object}. |
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349 */ |
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350 boolean isTrustedInterfaceType(); |
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351 |
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352 default ResolvedJavaMethod findMethod(String name, Signature signature) { |
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353 for (ResolvedJavaMethod method : getDeclaredMethods()) { |
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354 if (method.getName().equals(name) && method.getSignature().equals(signature)) { |
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355 return method; |
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356 } |
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357 } |
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358 return null; |
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359 } |
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360 |
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361 /** |
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362 * Returns true if this type is {@link Cloneable} and can be safely cloned by creating a normal |
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363 * Java allocation and populating it from the fields returned by |
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364 * {@link #getInstanceFields(boolean)}. Some types may require special handling by the platform |
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365 * so they would to go through the normal {@link Object#clone} path. |
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366 */ |
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367 boolean isAllocationCloneable(); |
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368 } |