Mercurial > hg > truffle
annotate src/share/vm/classfile/classLoaderData.hpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | e861d44e0c9c |
children | 90273fc0a981 |
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1 /* |
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2 * Copyright (c) 2012, 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 */ |
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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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35 // |
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36 // A class loader represents a linkset. Conceptually, a linkset identifies |
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37 // the complete transitive closure of resolved links that a dynamic linker can |
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38 // produce. |
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39 // |
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40 // A ClassLoaderData also encapsulates the allocation space, called a metaspace, |
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41 // used by the dynamic linker to allocate the runtime representation of all |
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42 // the types it defines. |
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43 // |
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44 // ClassLoaderData are stored in the runtime representation of classes and the |
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45 // system dictionary, are roots of garbage collection, and provides iterators |
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46 // for root tracing and other GC operations. |
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47 |
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48 class ClassLoaderData; |
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49 class JNIMethodBlock; |
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50 class JNIHandleBlock; |
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51 class Metadebug; |
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52 // GC root for walking class loader data created |
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53 |
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54 class ClassLoaderDataGraph : public AllStatic { |
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55 friend class ClassLoaderData; |
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56 friend class ClassLoaderDataGraphMetaspaceIterator; |
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57 friend class VMStructs; |
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58 private: |
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59 // All CLDs (except the null CLD) can be reached by walking _head->_next->... |
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60 static ClassLoaderData* _head; |
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61 static ClassLoaderData* _unloading; |
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62 // CMS support. |
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63 static ClassLoaderData* _saved_head; |
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64 |
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65 static ClassLoaderData* add(ClassLoaderData** loader_data_addr, Handle class_loader); |
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66 public: |
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67 static ClassLoaderData* find_or_create(Handle class_loader); |
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68 static void purge(); |
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69 static void clear_claimed_marks(); |
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70 static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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71 static void always_strong_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim); |
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72 static void classes_do(KlassClosure* klass_closure); |
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73 static bool do_unloading(BoolObjectClosure* is_alive); |
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74 |
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75 // CMS support. |
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76 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); } |
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77 static GrowableArray<ClassLoaderData*>* new_clds(); |
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78 |
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79 static void dump_on(outputStream * const out) PRODUCT_RETURN; |
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80 static void dump() { dump_on(tty); } |
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81 static void verify(); |
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82 |
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83 #ifndef PRODUCT |
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84 // expensive test for pointer in metaspace for debugging |
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85 static bool contains(address x); |
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86 static bool contains_loader_data(ClassLoaderData* loader_data); |
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87 #endif |
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88 }; |
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89 |
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90 // ClassLoaderData class |
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91 |
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92 class ClassLoaderData : public CHeapObj<mtClass> { |
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93 friend class VMStructs; |
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94 private: |
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95 friend class ClassLoaderDataGraph; |
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96 friend class ClassLoaderDataGraphMetaspaceIterator; |
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97 friend class MetaDataFactory; |
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98 friend class Method; |
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99 |
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100 static ClassLoaderData * _the_null_class_loader_data; |
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101 |
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102 oop _class_loader; // oop used to uniquely identify a class loader |
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103 // class loader or a canonical class path |
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104 Metaspace * _metaspace; // Meta-space where meta-data defined by the |
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105 // classes in the class loader are allocated. |
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106 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup. |
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107 bool _unloading; // true if this class loader goes away |
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108 volatile int _claimed; // true if claimed, for example during GC traces. |
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109 // To avoid applying oop closure more than once. |
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110 // Has to be an int because we cas it. |
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111 Klass* _klasses; // The classes defined by the class loader. |
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112 |
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113 JNIHandleBlock* _handles; // Handles to constant pool arrays |
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114 |
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115 // These method IDs are created for the class loader and set to NULL when the |
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116 // class loader is unloaded. They are rarely freed, only for redefine classes |
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117 // and if they lose a data race in InstanceKlass. |
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118 JNIMethodBlock* _jmethod_ids; |
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119 |
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120 // Metadata to be deallocated when it's safe at class unloading, when |
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121 // this class loader isn't unloaded itself. |
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122 GrowableArray<Metadata*>* _deallocate_list; |
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123 |
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124 // Support for walking class loader data objects |
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125 ClassLoaderData* _next; /// Next loader_datas created |
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126 |
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127 // ReadOnly and ReadWrite metaspaces (static because only on the null |
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128 // class loader for now). |
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129 static Metaspace* _ro_metaspace; |
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130 static Metaspace* _rw_metaspace; |
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131 |
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132 bool has_dependency(ClassLoaderData* cld); |
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133 void add_dependency(ClassLoaderData* to_loader_data, TRAPS); |
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134 |
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135 void set_next(ClassLoaderData* next) { _next = next; } |
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136 ClassLoaderData* next() const { return _next; } |
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137 |
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138 ClassLoaderData(Handle h_class_loader); |
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139 ~ClassLoaderData(); |
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140 |
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141 void set_metaspace(Metaspace* m) { _metaspace = m; } |
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142 |
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143 JNIHandleBlock* handles() const; |
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144 void set_handles(JNIHandleBlock* handles); |
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145 |
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146 Mutex* metaspace_lock() const { return _metaspace_lock; } |
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147 |
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148 // GC interface. |
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149 void clear_claimed() { _claimed = 0; } |
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150 bool claimed() const { return _claimed == 1; } |
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151 bool claim(); |
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152 |
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153 void mark_for_unload() { _unloading = true; } |
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154 |
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155 void classes_do(void f(InstanceKlass*)); |
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156 |
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157 // Deallocate free list during class unloading. |
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158 void free_deallocate_list(); |
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159 |
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160 // Allocate out of this class loader data |
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161 MetaWord* allocate(size_t size); |
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162 |
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163 public: |
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164 // Accessors |
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165 Metaspace* metaspace_or_null() const { return _metaspace; } |
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166 |
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167 static ClassLoaderData* the_null_class_loader_data() { |
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168 return _the_null_class_loader_data; |
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169 } |
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170 |
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171 static void init_null_class_loader_data() { |
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172 assert(_the_null_class_loader_data == NULL, "cannot initialize twice"); |
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173 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice"); |
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174 _the_null_class_loader_data = new ClassLoaderData((oop)NULL); |
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175 ClassLoaderDataGraph::_head = _the_null_class_loader_data; |
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176 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be"); |
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177 if (DumpSharedSpaces) { |
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178 _the_null_class_loader_data->initialize_shared_metaspaces(); |
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179 } |
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180 } |
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181 |
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182 bool is_the_null_class_loader_data() const { |
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183 return this == _the_null_class_loader_data; |
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184 } |
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185 |
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186 // The Metaspace is created lazily so may be NULL. This |
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187 // method will allocate a Metaspace if needed. |
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188 Metaspace* metaspace_non_null(); |
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189 |
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190 oop class_loader() const { return _class_loader; } |
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191 |
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192 // Returns true if this class loader data is for a loader going away. |
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193 bool is_unloading() const { |
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194 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded"); |
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195 return _unloading; |
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196 } |
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197 |
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198 unsigned int identity_hash() { |
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199 return _class_loader == NULL ? 0 : _class_loader->identity_hash(); |
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200 } |
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201 |
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202 // Used when tracing from klasses. |
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203 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim); |
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204 |
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205 void classes_do(KlassClosure* klass_closure); |
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206 |
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207 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; } |
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208 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; } |
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209 |
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210 void print_value() { print_value_on(tty); } |
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211 void print_value_on(outputStream* out) const PRODUCT_RETURN; |
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212 void dump(outputStream * const out) PRODUCT_RETURN; |
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213 void verify(); |
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214 |
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215 jobject add_handle(Handle h); |
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216 void add_class(Klass* k); |
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217 void remove_class(Klass* k); |
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218 void record_dependency(Klass* to, TRAPS); |
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219 |
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220 void add_to_deallocate_list(Metadata* m); |
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221 |
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222 static ClassLoaderData* class_loader_data(oop loader); |
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223 static void print_loader(ClassLoaderData *loader_data, outputStream *out); |
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224 |
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225 // CDS support |
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226 Metaspace* ro_metaspace(); |
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227 Metaspace* rw_metaspace(); |
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228 void initialize_shared_metaspaces(); |
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229 }; |
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230 |
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231 class ClassLoaderDataGraphMetaspaceIterator : public StackObj { |
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232 ClassLoaderData* _data; |
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233 public: |
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234 ClassLoaderDataGraphMetaspaceIterator(); |
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235 ~ClassLoaderDataGraphMetaspaceIterator(); |
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236 bool repeat() { return _data != NULL; } |
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237 Metaspace* get_next() { |
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238 assert(_data != NULL, "Should not be NULL in call to the iterator"); |
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239 Metaspace* result = _data->metaspace_or_null(); |
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240 _data = _data->next(); |
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241 // This result might be NULL for class loaders without metaspace |
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242 // yet. It would be nice to return only non-null results but |
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243 // there is no guarantee that there will be a non-null result |
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244 // down the list so the caller is going to have to check. |
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245 return result; |
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246 } |
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247 }; |
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248 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP |