Mercurial > hg > truffle
annotate src/share/vm/classfile/classLoaderData.hpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
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1 /* |
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2 * Copyright (c) 2012, 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 |
7440 | 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 */ |
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24 |
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25 #ifndef SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |
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26 #define SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |
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27 |
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28 #include "memory/allocation.hpp" |
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29 #include "memory/memRegion.hpp" |
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30 #include "memory/metaspace.hpp" |
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31 #include "memory/metaspaceCounters.hpp" |
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32 #include "runtime/mutex.hpp" |
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33 #include "utilities/growableArray.hpp" |
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34 |
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36 # include "utilities/ticks.hpp" |
10405 | 37 #endif |
38 | |
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39 // |
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40 // A class loader represents a linkset. Conceptually, a linkset identifies |
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41 // the complete transitive closure of resolved links that a dynamic linker can |
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42 // produce. |
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43 // |
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44 // A ClassLoaderData also encapsulates the allocation space, called a metaspace, |
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45 // used by the dynamic linker to allocate the runtime representation of all |
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46 // the types it defines. |
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47 // |
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48 // ClassLoaderData are stored in the runtime representation of classes and the |
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49 // system dictionary, are roots of garbage collection, and provides iterators |
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50 // for root tracing and other GC operations. |
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51 |
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52 class ClassLoaderData; |
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53 class JNIMethodBlock; |
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54 class JNIHandleBlock; |
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55 class Metadebug; |
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57 // GC root for walking class loader data created |
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58 |
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59 class ClassLoaderDataGraph : public AllStatic { |
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60 friend class ClassLoaderData; |
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61 friend class ClassLoaderDataGraphMetaspaceIterator; |
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62 friend class VMStructs; |
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63 private: |
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64 // All CLDs (except the null CLD) can be reached by walking _head->_next->... |
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65 static ClassLoaderData* _head; |
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66 static ClassLoaderData* _unloading; |
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67 // CMS support. |
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68 static ClassLoaderData* _saved_head; |
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69 |
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70 static ClassLoaderData* add(Handle class_loader, bool anonymous, TRAPS); |
10405 | 71 static void post_class_unload_events(void); |
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72 public: |
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73 static ClassLoaderData* find_or_create(Handle class_loader, TRAPS); |
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74 static void purge(); |
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75 static void clear_claimed_marks(); |
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76 static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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77 static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
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78 static void keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
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79 static void classes_do(KlassClosure* klass_closure); |
10405 | 80 static void classes_do(void f(Klass* const)); |
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81 static void loaded_classes_do(KlassClosure* klass_closure); |
10405 | 82 static void classes_unloading_do(void f(Klass* const)); |
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83 static bool do_unloading(BoolObjectClosure* is_alive); |
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84 |
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85 // CMS support. |
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86 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); } |
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87 static GrowableArray<ClassLoaderData*>* new_clds(); |
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88 |
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89 static void dump_on(outputStream * const out) PRODUCT_RETURN; |
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90 static void dump() { dump_on(tty); } |
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91 static void verify(); |
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92 |
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93 // expensive test for pointer in metaspace for debugging |
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94 static bool contains(const void* x); |
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95 #ifndef PRODUCT |
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96 static bool contains_loader_data(ClassLoaderData* loader_data); |
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97 #endif |
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99 #if INCLUDE_TRACE | |
100 private: | |
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101 static Ticks _class_unload_time; |
10405 | 102 static void class_unload_event(Klass* const k); |
103 #endif | |
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104 }; |
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105 |
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106 // ClassLoaderData class |
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107 |
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108 class ClassLoaderData : public CHeapObj<mtClass> { |
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109 friend class VMStructs; |
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110 private: |
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111 class Dependencies VALUE_OBJ_CLASS_SPEC { |
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112 objArrayOop _list_head; |
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113 void locked_add(objArrayHandle last, |
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114 objArrayHandle new_dependency, |
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115 Thread* THREAD); |
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116 public: |
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117 Dependencies() : _list_head(NULL) {} |
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118 Dependencies(TRAPS) : _list_head(NULL) { |
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119 init(CHECK); |
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120 } |
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121 void add(Handle dependency, TRAPS); |
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122 void init(TRAPS); |
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123 void oops_do(OopClosure* f); |
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124 }; |
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125 |
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126 friend class ClassLoaderDataGraph; |
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127 friend class ClassLoaderDataGraphMetaspaceIterator; |
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128 friend class MetaDataFactory; |
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129 friend class Method; |
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130 |
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131 static ClassLoaderData * _the_null_class_loader_data; |
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132 |
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133 oop _class_loader; // oop used to uniquely identify a class loader |
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134 // class loader or a canonical class path |
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135 Dependencies _dependencies; // holds dependencies from this class loader |
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136 // data to others. |
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137 |
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138 Metaspace * _metaspace; // Meta-space where meta-data defined by the |
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139 // classes in the class loader are allocated. |
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140 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup. |
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141 bool _unloading; // true if this class loader goes away |
14484 | 142 bool _keep_alive; // if this CLD is kept alive without a keep_alive_object(). |
7409 | 143 bool _is_anonymous; // if this CLD is for an anonymous class |
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144 volatile int _claimed; // true if claimed, for example during GC traces. |
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145 // To avoid applying oop closure more than once. |
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146 // Has to be an int because we cas it. |
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147 Klass* _klasses; // The classes defined by the class loader. |
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148 |
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149 JNIHandleBlock* _handles; // Handles to constant pool arrays |
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150 |
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151 // These method IDs are created for the class loader and set to NULL when the |
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152 // class loader is unloaded. They are rarely freed, only for redefine classes |
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153 // and if they lose a data race in InstanceKlass. |
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154 JNIMethodBlock* _jmethod_ids; |
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155 |
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156 // Metadata to be deallocated when it's safe at class unloading, when |
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157 // this class loader isn't unloaded itself. |
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158 GrowableArray<Metadata*>* _deallocate_list; |
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159 |
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160 // Support for walking class loader data objects |
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161 ClassLoaderData* _next; /// Next loader_datas created |
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162 |
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163 // ReadOnly and ReadWrite metaspaces (static because only on the null |
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164 // class loader for now). |
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165 static Metaspace* _ro_metaspace; |
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166 static Metaspace* _rw_metaspace; |
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167 |
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168 void set_next(ClassLoaderData* next) { _next = next; } |
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169 ClassLoaderData* next() const { return _next; } |
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170 |
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171 ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies); |
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172 ~ClassLoaderData(); |
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173 |
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174 void set_metaspace(Metaspace* m) { _metaspace = m; } |
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175 |
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176 JNIHandleBlock* handles() const; |
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177 void set_handles(JNIHandleBlock* handles); |
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178 |
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179 Mutex* metaspace_lock() const { return _metaspace_lock; } |
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180 |
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181 // GC interface. |
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182 void clear_claimed() { _claimed = 0; } |
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183 bool claimed() const { return _claimed == 1; } |
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184 bool claim(); |
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185 |
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186 void unload(); |
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187 bool keep_alive() const { return _keep_alive; } |
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188 bool is_alive(BoolObjectClosure* is_alive_closure) const; |
10405 | 189 void classes_do(void f(Klass*)); |
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190 void loaded_classes_do(KlassClosure* klass_closure); |
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191 void classes_do(void f(InstanceKlass*)); |
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192 |
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193 // Deallocate free list during class unloading. |
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194 void free_deallocate_list(); |
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195 |
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196 // Allocate out of this class loader data |
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197 MetaWord* allocate(size_t size); |
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198 |
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199 public: |
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200 // Accessors |
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201 Metaspace* metaspace_or_null() const { return _metaspace; } |
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202 |
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203 static ClassLoaderData* the_null_class_loader_data() { |
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204 return _the_null_class_loader_data; |
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205 } |
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206 |
7409 | 207 bool is_anonymous() const { return _is_anonymous; } |
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208 |
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209 static void init_null_class_loader_data() { |
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210 assert(_the_null_class_loader_data == NULL, "cannot initialize twice"); |
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211 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice"); |
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212 |
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213 // We explicitly initialize the Dependencies object at a later phase in the initialization |
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214 _the_null_class_loader_data = new ClassLoaderData((oop)NULL, false, Dependencies()); |
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215 ClassLoaderDataGraph::_head = _the_null_class_loader_data; |
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216 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be"); |
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217 if (DumpSharedSpaces) { |
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218 _the_null_class_loader_data->initialize_shared_metaspaces(); |
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219 } |
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220 } |
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221 |
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222 bool is_the_null_class_loader_data() const { |
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223 return this == _the_null_class_loader_data; |
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224 } |
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225 bool is_ext_class_loader_data() const; |
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226 |
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227 // The Metaspace is created lazily so may be NULL. This |
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228 // method will allocate a Metaspace if needed. |
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229 Metaspace* metaspace_non_null(); |
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230 |
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231 oop class_loader() const { return _class_loader; } |
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232 |
14484 | 233 // The object the GC is using to keep this ClassLoaderData alive. |
234 oop keep_alive_object() const; | |
235 | |
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236 // Returns true if this class loader data is for a loader going away. |
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237 bool is_unloading() const { |
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238 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded"); |
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239 return _unloading; |
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240 } |
14484 | 241 |
242 // Used to make sure that this CLD is not unloaded. | |
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243 void set_keep_alive(bool value) { _keep_alive = value; } |
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244 |
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245 unsigned int identity_hash() { |
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246 return _class_loader == NULL ? 0 : _class_loader->identity_hash(); |
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247 } |
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248 |
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249 // Used when tracing from klasses. |
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250 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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251 |
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252 void classes_do(KlassClosure* klass_closure); |
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253 |
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254 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; } |
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255 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; } |
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256 |
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257 void print_value() { print_value_on(tty); } |
7956 | 258 void print_value_on(outputStream* out) const; |
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259 void dump(outputStream * const out) PRODUCT_RETURN; |
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260 void verify(); |
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261 const char* loader_name(); |
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262 |
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263 jobject add_handle(Handle h); |
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264 void add_class(Klass* k); |
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265 void remove_class(Klass* k); |
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266 bool contains_klass(Klass* k); |
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267 void record_dependency(Klass* to, TRAPS); |
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268 void init_dependencies(TRAPS); |
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269 |
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270 void add_to_deallocate_list(Metadata* m); |
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271 |
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272 static ClassLoaderData* class_loader_data(oop loader); |
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273 static ClassLoaderData* class_loader_data_or_null(oop loader); |
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274 static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS); |
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275 static void print_loader(ClassLoaderData *loader_data, outputStream *out); |
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276 |
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277 // CDS support |
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278 Metaspace* ro_metaspace(); |
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279 Metaspace* rw_metaspace(); |
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280 void initialize_shared_metaspaces(); |
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281 }; |
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282 |
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283 class ClassLoaderDataGraphMetaspaceIterator : public StackObj { |
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284 ClassLoaderData* _data; |
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285 public: |
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286 ClassLoaderDataGraphMetaspaceIterator(); |
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287 ~ClassLoaderDataGraphMetaspaceIterator(); |
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288 bool repeat() { return _data != NULL; } |
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289 Metaspace* get_next() { |
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290 assert(_data != NULL, "Should not be NULL in call to the iterator"); |
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291 Metaspace* result = _data->metaspace_or_null(); |
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292 _data = _data->next(); |
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293 // This result might be NULL for class loaders without metaspace |
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294 // yet. It would be nice to return only non-null results but |
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295 // there is no guarantee that there will be a non-null result |
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296 // down the list so the caller is going to have to check. |
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297 return result; |
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298 } |
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299 }; |
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300 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |