Mercurial > hg > truffle
annotate src/share/vm/classfile/classLoaderData.hpp @ 20526:584df6794686
Added tag hs25.40-b14 for changeset e193bbae24ef
author | amurillo |
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date | Fri, 10 Oct 2014 03:07:09 -0700 |
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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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35 # include "utilities/ticks.hpp" |
10405 | 36 #endif |
37 | |
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38 // |
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39 // A class loader represents a linkset. Conceptually, a linkset identifies |
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40 // the complete transitive closure of resolved links that a dynamic linker can |
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41 // produce. |
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42 // |
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43 // A ClassLoaderData also encapsulates the allocation space, called a metaspace, |
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44 // used by the dynamic linker to allocate the runtime representation of all |
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45 // the types it defines. |
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46 // |
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47 // ClassLoaderData are stored in the runtime representation of classes and the |
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48 // system dictionary, are roots of garbage collection, and provides iterators |
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49 // for root tracing and other GC operations. |
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50 |
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51 class ClassLoaderData; |
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52 class JNIMethodBlock; |
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53 class JNIHandleBlock; |
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54 class Metadebug; |
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56 // GC root for walking class loader data created |
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57 |
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58 class ClassLoaderDataGraph : public AllStatic { |
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59 friend class ClassLoaderData; |
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60 friend class ClassLoaderDataGraphMetaspaceIterator; |
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61 friend class ClassLoaderDataGraphKlassIteratorAtomic; |
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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 static ClassLoaderData* _saved_unloading; |
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70 static bool _should_purge; |
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71 |
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72 static ClassLoaderData* add(Handle class_loader, bool anonymous, TRAPS); |
10405 | 73 static void post_class_unload_events(void); |
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74 public: |
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75 static ClassLoaderData* find_or_create(Handle class_loader, TRAPS); |
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76 static void purge(); |
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77 static void clear_claimed_marks(); |
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78 // oops do |
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79 static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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80 static void keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
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81 static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
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82 // cld do |
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83 static void cld_do(CLDClosure* cl); |
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84 static void roots_cld_do(CLDClosure* strong, CLDClosure* weak); |
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85 static void keep_alive_cld_do(CLDClosure* cl); |
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86 static void always_strong_cld_do(CLDClosure* cl); |
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87 // klass do |
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88 static void classes_do(KlassClosure* klass_closure); |
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90 static void loaded_classes_do(KlassClosure* klass_closure); |
10405 | 91 static void classes_unloading_do(void f(Klass* const)); |
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92 static bool do_unloading(BoolObjectClosure* is_alive); |
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93 |
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94 // CMS support. |
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95 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); } |
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96 static GrowableArray<ClassLoaderData*>* new_clds(); |
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97 |
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98 static void set_should_purge(bool b) { _should_purge = b; } |
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99 static void purge_if_needed() { |
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100 // Only purge the CLDG for CMS if concurrent sweep is complete. |
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101 if (_should_purge) { |
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102 purge(); |
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103 // reset for next time. |
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104 set_should_purge(false); |
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105 } |
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106 } |
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107 |
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108 static void dump_on(outputStream * const out) PRODUCT_RETURN; |
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109 static void dump() { dump_on(tty); } |
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110 static void verify(); |
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111 |
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112 static bool unload_list_contains(const void* x); |
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113 #ifndef PRODUCT |
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114 static bool contains_loader_data(ClassLoaderData* loader_data); |
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115 #endif |
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117 #if INCLUDE_TRACE | |
118 private: | |
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119 static Ticks _class_unload_time; |
10405 | 120 static void class_unload_event(Klass* const k); |
121 #endif | |
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122 }; |
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123 |
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124 // ClassLoaderData class |
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125 |
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126 class ClassLoaderData : public CHeapObj<mtClass> { |
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127 friend class VMStructs; |
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128 private: |
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129 class Dependencies VALUE_OBJ_CLASS_SPEC { |
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130 objArrayOop _list_head; |
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131 void locked_add(objArrayHandle last, |
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132 objArrayHandle new_dependency, |
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133 Thread* THREAD); |
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134 public: |
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135 Dependencies() : _list_head(NULL) {} |
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136 Dependencies(TRAPS) : _list_head(NULL) { |
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137 init(CHECK); |
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138 } |
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139 void add(Handle dependency, TRAPS); |
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140 void init(TRAPS); |
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141 void oops_do(OopClosure* f); |
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142 }; |
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143 |
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144 friend class ClassLoaderDataGraph; |
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145 friend class ClassLoaderDataGraphKlassIteratorAtomic; |
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146 friend class ClassLoaderDataGraphMetaspaceIterator; |
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147 friend class MetaDataFactory; |
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148 friend class Method; |
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149 |
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150 static ClassLoaderData * _the_null_class_loader_data; |
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151 |
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152 oop _class_loader; // oop used to uniquely identify a class loader |
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153 // class loader or a canonical class path |
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154 Dependencies _dependencies; // holds dependencies from this class loader |
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155 // data to others. |
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156 |
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157 Metaspace * _metaspace; // Meta-space where meta-data defined by the |
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158 // classes in the class loader are allocated. |
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159 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup. |
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160 bool _unloading; // true if this class loader goes away |
20260 | 161 bool _keep_alive; // if this CLD is kept alive without a keep_alive_object(). |
7409 | 162 bool _is_anonymous; // if this CLD is for an anonymous class |
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163 volatile int _claimed; // true if claimed, for example during GC traces. |
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164 // To avoid applying oop closure more than once. |
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165 // Has to be an int because we cas it. |
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166 Klass* _klasses; // The classes defined by the class loader. |
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167 |
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168 JNIHandleBlock* _handles; // Handles to constant pool arrays |
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169 |
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170 // These method IDs are created for the class loader and set to NULL when the |
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171 // class loader is unloaded. They are rarely freed, only for redefine classes |
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172 // and if they lose a data race in InstanceKlass. |
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173 JNIMethodBlock* _jmethod_ids; |
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174 |
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175 // Metadata to be deallocated when it's safe at class unloading, when |
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176 // this class loader isn't unloaded itself. |
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177 GrowableArray<Metadata*>* _deallocate_list; |
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178 |
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179 // Support for walking class loader data objects |
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180 ClassLoaderData* _next; /// Next loader_datas created |
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181 |
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182 // ReadOnly and ReadWrite metaspaces (static because only on the null |
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183 // class loader for now). |
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184 static Metaspace* _ro_metaspace; |
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185 static Metaspace* _rw_metaspace; |
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186 |
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187 void set_next(ClassLoaderData* next) { _next = next; } |
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188 ClassLoaderData* next() const { return _next; } |
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189 |
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190 ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies); |
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191 ~ClassLoaderData(); |
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192 |
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193 void set_metaspace(Metaspace* m) { _metaspace = m; } |
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194 |
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195 JNIHandleBlock* handles() const; |
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196 void set_handles(JNIHandleBlock* handles); |
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197 |
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198 Mutex* metaspace_lock() const { return _metaspace_lock; } |
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199 |
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200 // GC interface. |
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201 void clear_claimed() { _claimed = 0; } |
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202 bool claimed() const { return _claimed == 1; } |
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203 bool claim(); |
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204 |
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205 void unload(); |
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206 bool keep_alive() const { return _keep_alive; } |
10405 | 207 void classes_do(void f(Klass*)); |
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208 void loaded_classes_do(KlassClosure* klass_closure); |
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209 void classes_do(void f(InstanceKlass*)); |
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210 |
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211 // Deallocate free list during class unloading. |
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212 void free_deallocate_list(); |
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213 |
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214 // Allocate out of this class loader data |
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215 MetaWord* allocate(size_t size); |
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216 |
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217 public: |
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218 |
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219 bool is_alive(BoolObjectClosure* is_alive_closure) const; |
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220 |
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221 // Accessors |
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222 Metaspace* metaspace_or_null() const { return _metaspace; } |
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223 |
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224 static ClassLoaderData* the_null_class_loader_data() { |
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225 return _the_null_class_loader_data; |
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226 } |
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227 |
7409 | 228 bool is_anonymous() const { return _is_anonymous; } |
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229 |
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230 static void init_null_class_loader_data() { |
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231 assert(_the_null_class_loader_data == NULL, "cannot initialize twice"); |
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232 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice"); |
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233 |
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234 // We explicitly initialize the Dependencies object at a later phase in the initialization |
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235 _the_null_class_loader_data = new ClassLoaderData((oop)NULL, false, Dependencies()); |
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236 ClassLoaderDataGraph::_head = _the_null_class_loader_data; |
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237 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be"); |
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238 if (DumpSharedSpaces) { |
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239 _the_null_class_loader_data->initialize_shared_metaspaces(); |
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240 } |
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241 } |
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242 |
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243 bool is_the_null_class_loader_data() const { |
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244 return this == _the_null_class_loader_data; |
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245 } |
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246 bool is_ext_class_loader_data() const; |
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247 |
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248 // The Metaspace is created lazily so may be NULL. This |
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249 // method will allocate a Metaspace if needed. |
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250 Metaspace* metaspace_non_null(); |
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251 |
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252 oop class_loader() const { return _class_loader; } |
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253 |
20260 | 254 // The object the GC is using to keep this ClassLoaderData alive. |
255 oop keep_alive_object() const; | |
256 | |
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257 // Returns true if this class loader data is for a loader going away. |
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258 bool is_unloading() const { |
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259 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded"); |
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260 return _unloading; |
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261 } |
20260 | 262 |
263 // Used to make sure that this CLD is not unloaded. | |
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264 void set_keep_alive(bool value) { _keep_alive = value; } |
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265 |
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266 unsigned int identity_hash() { |
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267 return _class_loader == NULL ? 0 : _class_loader->identity_hash(); |
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268 } |
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269 |
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270 // Used when tracing from klasses. |
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271 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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272 |
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273 void classes_do(KlassClosure* klass_closure); |
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274 |
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275 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; } |
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276 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; } |
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277 |
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278 void print_value() { print_value_on(tty); } |
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280 void dump(outputStream * const out) PRODUCT_RETURN; |
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281 void verify(); |
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282 const char* loader_name(); |
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283 |
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284 jobject add_handle(Handle h); |
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285 void add_class(Klass* k); |
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286 void remove_class(Klass* k); |
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287 bool contains_klass(Klass* k); |
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288 void record_dependency(Klass* to, TRAPS); |
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289 void init_dependencies(TRAPS); |
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290 |
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291 void add_to_deallocate_list(Metadata* m); |
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292 |
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293 static ClassLoaderData* class_loader_data(oop loader); |
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294 static ClassLoaderData* class_loader_data_or_null(oop loader); |
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295 static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS); |
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296 static void print_loader(ClassLoaderData *loader_data, outputStream *out); |
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297 |
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298 // CDS support |
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299 Metaspace* ro_metaspace(); |
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300 Metaspace* rw_metaspace(); |
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301 void initialize_shared_metaspaces(); |
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302 }; |
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303 |
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304 // An iterator that distributes Klasses to parallel worker threads. |
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305 class ClassLoaderDataGraphKlassIteratorAtomic : public StackObj { |
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306 volatile Klass* _next_klass; |
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307 public: |
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308 ClassLoaderDataGraphKlassIteratorAtomic(); |
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309 Klass* next_klass(); |
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310 private: |
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311 static Klass* next_klass_in_cldg(Klass* klass); |
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312 }; |
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313 |
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314 class ClassLoaderDataGraphMetaspaceIterator : public StackObj { |
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315 ClassLoaderData* _data; |
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316 public: |
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317 ClassLoaderDataGraphMetaspaceIterator(); |
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318 ~ClassLoaderDataGraphMetaspaceIterator(); |
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319 bool repeat() { return _data != NULL; } |
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320 Metaspace* get_next() { |
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321 assert(_data != NULL, "Should not be NULL in call to the iterator"); |
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322 Metaspace* result = _data->metaspace_or_null(); |
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323 _data = _data->next(); |
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324 // This result might be NULL for class loaders without metaspace |
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325 // yet. It would be nice to return only non-null results but |
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326 // there is no guarantee that there will be a non-null result |
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327 // down the list so the caller is going to have to check. |
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328 return result; |
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329 } |
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330 }; |
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331 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |