annotate src/share/vm/classfile/classLoaderData.hpp @ 17999:e4a6e7f1b90b hs25.20-b21

8047812: Ensure ClassLoaderDataGraph::classes_unloading_do only delivers klasses from CLDs with non-reclaimed class loader oops Reviewed-by: coleenp, sspitsyn, ehelin
author mgronlun
date Tue, 01 Jul 2014 10:36:19 +0200
parents 7384f6a12fc1
children 52b4284cb496 556a06aec3fa
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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
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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 #if INCLUDE_TRACE
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36 # include "utilities/ticks.hpp"
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37 #endif
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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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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 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);
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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 static void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
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79 static void always_strong_oops_do(OopClosure* blk, 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 classes_do(KlassClosure* klass_closure);
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82 static void classes_do(void f(Klass* const));
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83 static void loaded_classes_do(KlassClosure* klass_closure);
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84 static void classes_unloading_do(void f(Klass* const));
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85 static bool do_unloading(BoolObjectClosure* is_alive);
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86
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87 // CMS support.
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88 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
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89 static GrowableArray<ClassLoaderData*>* new_clds();
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90
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91 static void set_should_purge(bool b) { _should_purge = b; }
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92 static void purge_if_needed() {
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93 // Only purge the CLDG for CMS if concurrent sweep is complete.
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94 if (_should_purge) {
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95 purge();
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96 // reset for next time.
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97 set_should_purge(false);
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98 }
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99 }
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100
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101 static void dump_on(outputStream * const out) PRODUCT_RETURN;
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102 static void dump() { dump_on(tty); }
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103 static void verify();
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104
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105 #ifndef PRODUCT
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106 static bool contains_loader_data(ClassLoaderData* loader_data);
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107 #endif
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108
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109 #if INCLUDE_TRACE
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110 private:
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111 static Ticks _class_unload_time;
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112 static void class_unload_event(Klass* const k);
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113 #endif
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114 };
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115
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116 // ClassLoaderData class
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117
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118 class ClassLoaderData : public CHeapObj<mtClass> {
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119 friend class VMStructs;
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120 private:
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121 class Dependencies VALUE_OBJ_CLASS_SPEC {
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122 objArrayOop _list_head;
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123 void locked_add(objArrayHandle last,
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124 objArrayHandle new_dependency,
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125 Thread* THREAD);
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126 public:
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127 Dependencies() : _list_head(NULL) {}
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128 Dependencies(TRAPS) : _list_head(NULL) {
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129 init(CHECK);
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130 }
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131 void add(Handle dependency, TRAPS);
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132 void init(TRAPS);
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133 void oops_do(OopClosure* f);
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134 };
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135
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136 friend class ClassLoaderDataGraph;
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137 friend class ClassLoaderDataGraphMetaspaceIterator;
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138 friend class MetaDataFactory;
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139 friend class Method;
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140
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141 static ClassLoaderData * _the_null_class_loader_data;
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142
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143 oop _class_loader; // oop used to uniquely identify a class loader
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144 // class loader or a canonical class path
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145 Dependencies _dependencies; // holds dependencies from this class loader
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146 // data to others.
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147
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148 Metaspace * _metaspace; // Meta-space where meta-data defined by the
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149 // classes in the class loader are allocated.
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150 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup.
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151 bool _unloading; // true if this class loader goes away
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152 bool _keep_alive; // if this CLD can be unloaded for anonymous loaders
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153 bool _is_anonymous; // if this CLD is for an anonymous class
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154 volatile int _claimed; // true if claimed, for example during GC traces.
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155 // To avoid applying oop closure more than once.
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156 // Has to be an int because we cas it.
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157 Klass* _klasses; // The classes defined by the class loader.
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158
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159 JNIHandleBlock* _handles; // Handles to constant pool arrays
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160
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161 // These method IDs are created for the class loader and set to NULL when the
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162 // class loader is unloaded. They are rarely freed, only for redefine classes
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163 // and if they lose a data race in InstanceKlass.
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164 JNIMethodBlock* _jmethod_ids;
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165
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166 // Metadata to be deallocated when it's safe at class unloading, when
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167 // this class loader isn't unloaded itself.
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168 GrowableArray<Metadata*>* _deallocate_list;
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169
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170 // Support for walking class loader data objects
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171 ClassLoaderData* _next; /// Next loader_datas created
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172
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173 // ReadOnly and ReadWrite metaspaces (static because only on the null
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174 // class loader for now).
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175 static Metaspace* _ro_metaspace;
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176 static Metaspace* _rw_metaspace;
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177
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178 void set_next(ClassLoaderData* next) { _next = next; }
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179 ClassLoaderData* next() const { return _next; }
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180
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181 ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies);
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182 ~ClassLoaderData();
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183
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184 void set_metaspace(Metaspace* m) { _metaspace = m; }
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185
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186 JNIHandleBlock* handles() const;
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187 void set_handles(JNIHandleBlock* handles);
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188
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189 Mutex* metaspace_lock() const { return _metaspace_lock; }
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190
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191 // GC interface.
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192 void clear_claimed() { _claimed = 0; }
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193 bool claimed() const { return _claimed == 1; }
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194 bool claim();
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195
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196 void unload();
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197 bool keep_alive() const { return _keep_alive; }
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198 bool is_alive(BoolObjectClosure* is_alive_closure) const;
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199 void classes_do(void f(Klass*));
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200 void loaded_classes_do(KlassClosure* klass_closure);
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201 void classes_do(void f(InstanceKlass*));
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202
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203 // Deallocate free list during class unloading.
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204 void free_deallocate_list();
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205
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206 // Allocate out of this class loader data
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207 MetaWord* allocate(size_t size);
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208
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209 public:
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210 // Accessors
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211 Metaspace* metaspace_or_null() const { return _metaspace; }
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212
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213 static ClassLoaderData* the_null_class_loader_data() {
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214 return _the_null_class_loader_data;
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215 }
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216
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217 bool is_anonymous() const { return _is_anonymous; }
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218
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219 static void init_null_class_loader_data() {
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220 assert(_the_null_class_loader_data == NULL, "cannot initialize twice");
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221 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice");
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222
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223 // We explicitly initialize the Dependencies object at a later phase in the initialization
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224 _the_null_class_loader_data = new ClassLoaderData((oop)NULL, false, Dependencies());
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225 ClassLoaderDataGraph::_head = _the_null_class_loader_data;
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226 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be");
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227 if (DumpSharedSpaces) {
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228 _the_null_class_loader_data->initialize_shared_metaspaces();
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229 }
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230 }
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231
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232 bool is_the_null_class_loader_data() const {
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233 return this == _the_null_class_loader_data;
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234 }
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235 bool is_ext_class_loader_data() const;
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236
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237 // The Metaspace is created lazily so may be NULL. This
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238 // method will allocate a Metaspace if needed.
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239 Metaspace* metaspace_non_null();
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240
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241 oop class_loader() const { return _class_loader; }
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242
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243 // Returns true if this class loader data is for a loader going away.
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244 bool is_unloading() const {
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245 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded");
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246 return _unloading;
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247 }
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248 // Anonymous class loader data doesn't have anything to keep them from
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249 // being unloaded during parsing the anonymous class.
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250 void set_keep_alive(bool value) { _keep_alive = value; }
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251
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252 unsigned int identity_hash() {
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253 return _class_loader == NULL ? 0 : _class_loader->identity_hash();
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254 }
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255
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256 // Used when tracing from klasses.
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257 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
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258
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259 void classes_do(KlassClosure* klass_closure);
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260
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261 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; }
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262 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; }
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263
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264 void print_value() { print_value_on(tty); }
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265 void print_value_on(outputStream* out) const;
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266 void dump(outputStream * const out) PRODUCT_RETURN;
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267 void verify();
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268 const char* loader_name();
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269
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270 jobject add_handle(Handle h);
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271 void add_class(Klass* k);
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272 void remove_class(Klass* k);
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273 bool contains_klass(Klass* k);
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274 void record_dependency(Klass* to, TRAPS);
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275 void init_dependencies(TRAPS);
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276
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277 void add_to_deallocate_list(Metadata* m);
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278
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279 static ClassLoaderData* class_loader_data(oop loader);
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280 static ClassLoaderData* class_loader_data_or_null(oop loader);
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281 static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS);
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282 static void print_loader(ClassLoaderData *loader_data, outputStream *out);
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283
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284 // CDS support
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285 Metaspace* ro_metaspace();
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286 Metaspace* rw_metaspace();
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287 void initialize_shared_metaspaces();
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288 };
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289
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290 class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
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291 ClassLoaderData* _data;
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292 public:
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293 ClassLoaderDataGraphMetaspaceIterator();
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294 ~ClassLoaderDataGraphMetaspaceIterator();
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295 bool repeat() { return _data != NULL; }
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296 Metaspace* get_next() {
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297 assert(_data != NULL, "Should not be NULL in call to the iterator");
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298 Metaspace* result = _data->metaspace_or_null();
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299 _data = _data->next();
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300 // This result might be NULL for class loaders without metaspace
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301 // yet. It would be nice to return only non-null results but
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302 // there is no guarantee that there will be a non-null result
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303 // down the list so the caller is going to have to check.
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304 return result;
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305 }
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306 };
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307 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP