Mercurial > hg > truffle
annotate src/share/vm/classfile/classLoaderData.hpp @ 12837:82af7d7a0128
8003420: NPG: make new GC root for pd_set
Summary: Move protection domain oops from system dictionary entries into a seperate set; the system dictionary references entries in that set now. This allows fast iteration during non-classunloading garbage collection. Implementation based on initial prototype from Ioi Lam (iklam).
Reviewed-by: coleenp, iklam
author | tschatzl |
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date | Wed, 09 Oct 2013 10:57:01 +0200 |
parents | f2110083203d |
children | e64f1fe9756b |
rev | line source |
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1 /* |
7956 | 2 * Copyright (c) 2012, 2013, 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 |
10405 | 35 #if INCLUDE_TRACE |
36 # include "trace/traceTime.hpp" | |
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; |
10405 | 56 |
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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)); |
81 static void classes_unloading_do(void f(Klass* const)); | |
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82 static bool do_unloading(BoolObjectClosure* is_alive); |
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83 |
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84 // CMS support. |
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85 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); } |
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86 static GrowableArray<ClassLoaderData*>* new_clds(); |
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87 |
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88 static void dump_on(outputStream * const out) PRODUCT_RETURN; |
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89 static void dump() { dump_on(tty); } |
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90 static void verify(); |
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91 |
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92 #ifndef PRODUCT |
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93 // expensive test for pointer in metaspace for debugging |
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94 static bool contains(address x); |
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95 static bool contains_loader_data(ClassLoaderData* loader_data); |
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96 #endif |
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98 #if INCLUDE_TRACE | |
99 private: | |
100 static TracingTime _class_unload_time; | |
101 static void class_unload_event(Klass* const k); | |
102 #endif | |
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103 }; |
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104 |
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105 // ClassLoaderData class |
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106 |
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107 class ClassLoaderData : public CHeapObj<mtClass> { |
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108 friend class VMStructs; |
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109 private: |
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110 class Dependencies VALUE_OBJ_CLASS_SPEC { |
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111 objArrayOop _list_head; |
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112 void locked_add(objArrayHandle last, |
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113 objArrayHandle new_dependency, |
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114 Thread* THREAD); |
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115 public: |
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116 Dependencies() : _list_head(NULL) {} |
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117 Dependencies(TRAPS) : _list_head(NULL) { |
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118 init(CHECK); |
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119 } |
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120 void add(Handle dependency, TRAPS); |
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121 void init(TRAPS); |
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122 void oops_do(OopClosure* f); |
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123 }; |
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124 |
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125 friend class ClassLoaderDataGraph; |
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126 friend class ClassLoaderDataGraphMetaspaceIterator; |
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127 friend class MetaDataFactory; |
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128 friend class Method; |
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129 |
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130 static ClassLoaderData * _the_null_class_loader_data; |
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131 |
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132 oop _class_loader; // oop used to uniquely identify a class loader |
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133 // class loader or a canonical class path |
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134 Dependencies _dependencies; // holds dependencies from this class loader |
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135 // data to others. |
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136 |
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137 Metaspace * _metaspace; // Meta-space where meta-data defined by the |
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138 // classes in the class loader are allocated. |
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139 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup. |
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140 bool _unloading; // true if this class loader goes away |
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141 bool _keep_alive; // if this CLD can be unloaded for anonymous loaders |
7409 | 142 bool _is_anonymous; // if this CLD is for an anonymous class |
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143 volatile int _claimed; // true if claimed, for example during GC traces. |
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144 // To avoid applying oop closure more than once. |
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145 // Has to be an int because we cas it. |
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146 Klass* _klasses; // The classes defined by the class loader. |
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147 |
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148 JNIHandleBlock* _handles; // Handles to constant pool arrays |
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149 |
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150 // These method IDs are created for the class loader and set to NULL when the |
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151 // class loader is unloaded. They are rarely freed, only for redefine classes |
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152 // and if they lose a data race in InstanceKlass. |
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153 JNIMethodBlock* _jmethod_ids; |
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154 |
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155 // Metadata to be deallocated when it's safe at class unloading, when |
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156 // this class loader isn't unloaded itself. |
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157 GrowableArray<Metadata*>* _deallocate_list; |
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158 |
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159 // Support for walking class loader data objects |
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160 ClassLoaderData* _next; /// Next loader_datas created |
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161 |
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162 // ReadOnly and ReadWrite metaspaces (static because only on the null |
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163 // class loader for now). |
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164 static Metaspace* _ro_metaspace; |
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165 static Metaspace* _rw_metaspace; |
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166 |
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167 void set_next(ClassLoaderData* next) { _next = next; } |
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168 ClassLoaderData* next() const { return _next; } |
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169 |
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170 ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies); |
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171 ~ClassLoaderData(); |
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172 |
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173 void set_metaspace(Metaspace* m) { _metaspace = m; } |
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174 |
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175 JNIHandleBlock* handles() const; |
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176 void set_handles(JNIHandleBlock* handles); |
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177 |
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178 Mutex* metaspace_lock() const { return _metaspace_lock; } |
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179 |
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180 // GC interface. |
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181 void clear_claimed() { _claimed = 0; } |
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182 bool claimed() const { return _claimed == 1; } |
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183 bool claim(); |
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184 |
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185 void unload(); |
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186 bool keep_alive() const { return _keep_alive; } |
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187 bool is_alive(BoolObjectClosure* is_alive_closure) const; |
10405 | 188 void classes_do(void f(Klass*)); |
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189 void classes_do(void f(InstanceKlass*)); |
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190 |
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191 // Deallocate free list during class unloading. |
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192 void free_deallocate_list(); |
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193 |
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194 // Allocate out of this class loader data |
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195 MetaWord* allocate(size_t size); |
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196 |
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197 public: |
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198 // Accessors |
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199 Metaspace* metaspace_or_null() const { return _metaspace; } |
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200 |
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201 static ClassLoaderData* the_null_class_loader_data() { |
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202 return _the_null_class_loader_data; |
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203 } |
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204 |
7409 | 205 bool is_anonymous() const { return _is_anonymous; } |
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206 |
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207 static void init_null_class_loader_data() { |
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208 assert(_the_null_class_loader_data == NULL, "cannot initialize twice"); |
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209 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice"); |
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210 |
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211 // We explicitly initialize the Dependencies object at a later phase in the initialization |
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212 _the_null_class_loader_data = new ClassLoaderData((oop)NULL, false, Dependencies()); |
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213 ClassLoaderDataGraph::_head = _the_null_class_loader_data; |
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214 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be"); |
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215 if (DumpSharedSpaces) { |
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216 _the_null_class_loader_data->initialize_shared_metaspaces(); |
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217 } |
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218 } |
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219 |
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220 bool is_the_null_class_loader_data() const { |
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221 return this == _the_null_class_loader_data; |
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222 } |
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223 bool is_ext_class_loader_data() const; |
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224 |
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225 // The Metaspace is created lazily so may be NULL. This |
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226 // method will allocate a Metaspace if needed. |
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227 Metaspace* metaspace_non_null(); |
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228 |
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229 oop class_loader() const { return _class_loader; } |
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230 |
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231 // Returns true if this class loader data is for a loader going away. |
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232 bool is_unloading() const { |
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233 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded"); |
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234 return _unloading; |
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235 } |
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236 // Anonymous class loader data doesn't have anything to keep them from |
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237 // being unloaded during parsing the anonymous class. |
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238 void set_keep_alive(bool value) { _keep_alive = value; } |
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239 |
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240 unsigned int identity_hash() { |
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241 return _class_loader == NULL ? 0 : _class_loader->identity_hash(); |
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242 } |
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243 |
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244 // Used when tracing from klasses. |
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245 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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246 |
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247 void classes_do(KlassClosure* klass_closure); |
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248 |
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249 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; } |
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250 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; } |
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251 |
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252 void print_value() { print_value_on(tty); } |
7956 | 253 void print_value_on(outputStream* out) const; |
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254 void dump(outputStream * const out) PRODUCT_RETURN; |
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255 void verify(); |
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256 const char* loader_name(); |
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257 |
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258 jobject add_handle(Handle h); |
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259 void add_class(Klass* k); |
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260 void remove_class(Klass* k); |
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261 void record_dependency(Klass* to, TRAPS); |
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262 void init_dependencies(TRAPS); |
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263 |
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264 void add_to_deallocate_list(Metadata* m); |
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265 |
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266 static ClassLoaderData* class_loader_data(oop loader); |
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267 static ClassLoaderData* class_loader_data_or_null(oop loader); |
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268 static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS); |
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269 static void print_loader(ClassLoaderData *loader_data, outputStream *out); |
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270 |
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271 // CDS support |
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272 Metaspace* ro_metaspace(); |
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273 Metaspace* rw_metaspace(); |
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274 void initialize_shared_metaspaces(); |
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275 }; |
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276 |
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277 class ClassLoaderDataGraphMetaspaceIterator : public StackObj { |
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278 ClassLoaderData* _data; |
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279 public: |
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280 ClassLoaderDataGraphMetaspaceIterator(); |
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281 ~ClassLoaderDataGraphMetaspaceIterator(); |
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282 bool repeat() { return _data != NULL; } |
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283 Metaspace* get_next() { |
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284 assert(_data != NULL, "Should not be NULL in call to the iterator"); |
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285 Metaspace* result = _data->metaspace_or_null(); |
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286 _data = _data->next(); |
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287 // This result might be NULL for class loaders without metaspace |
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288 // yet. It would be nice to return only non-null results but |
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289 // there is no guarantee that there will be a non-null result |
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290 // down the list so the caller is going to have to check. |
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291 return result; |
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292 } |
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293 }; |
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294 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |