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annotate src/share/vm/classfile/classLoaderData.hpp @ 9075:ba42fd5e00e6

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8010196: NPG: Internal Error: Metaspace allocation lock -- possible deadlock Summary: Refactor the CLD dependency list into a separate class. Use an ObjectLocker to synchronize additions to the CLD dependency list. Reviewed-by: stefank, coleenp
author mgerdin
date Wed, 10 Apr 2013 13:27:35 +0200
parents 16885e702c88
children 1cb4795305b9
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1 /*
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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
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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, TRAPS);
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66 public:
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67 static ClassLoaderData* find_or_create(Handle class_loader, TRAPS);
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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 keep_alive_oops_do(OopClosure* blk, KlassClosure* klass_closure, bool must_claim);
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73 static void classes_do(KlassClosure* klass_closure);
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74 static bool do_unloading(BoolObjectClosure* is_alive);
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75
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76 // CMS support.
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77 static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
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78 static GrowableArray<ClassLoaderData*>* new_clds();
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79
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80 static void dump_on(outputStream * const out) PRODUCT_RETURN;
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81 static void dump() { dump_on(tty); }
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82 static void verify();
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83
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84 #ifndef PRODUCT
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85 // expensive test for pointer in metaspace for debugging
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86 static bool contains(address x);
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87 static bool contains_loader_data(ClassLoaderData* loader_data);
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88 #endif
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89 };
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90
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91 // ClassLoaderData class
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92
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93 class ClassLoaderData : public CHeapObj<mtClass> {
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94 friend class VMStructs;
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95 private:
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96 class Dependencies VALUE_OBJ_CLASS_SPEC {
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97 objArrayOop _list_head;
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98 void locked_add(objArrayHandle last,
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99 objArrayHandle new_dependency,
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100 Thread* THREAD);
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101 public:
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102 Dependencies() : _list_head(NULL) {}
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103 void add(Handle dependency, TRAPS);
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104 void init(TRAPS);
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105 void oops_do(OopClosure* f);
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106 };
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107
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108 friend class ClassLoaderDataGraph;
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109 friend class ClassLoaderDataGraphMetaspaceIterator;
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110 friend class MetaDataFactory;
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111 friend class Method;
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112
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113 static ClassLoaderData * _the_null_class_loader_data;
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114
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115 oop _class_loader; // oop used to uniquely identify a class loader
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116 // class loader or a canonical class path
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117 Dependencies _dependencies; // holds dependencies from this class loader
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118 // data to others.
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119
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120 Metaspace * _metaspace; // Meta-space where meta-data defined by the
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121 // classes in the class loader are allocated.
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122 Mutex* _metaspace_lock; // Locks the metaspace for allocations and setup.
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123 bool _unloading; // true if this class loader goes away
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124 bool _keep_alive; // if this CLD can be unloaded for anonymous loaders
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125 bool _is_anonymous; // if this CLD is for an anonymous class
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126 volatile int _claimed; // true if claimed, for example during GC traces.
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127 // To avoid applying oop closure more than once.
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128 // Has to be an int because we cas it.
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129 Klass* _klasses; // The classes defined by the class loader.
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130
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131 JNIHandleBlock* _handles; // Handles to constant pool arrays
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132
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133 // These method IDs are created for the class loader and set to NULL when the
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134 // class loader is unloaded. They are rarely freed, only for redefine classes
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135 // and if they lose a data race in InstanceKlass.
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136 JNIMethodBlock* _jmethod_ids;
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137
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138 // Metadata to be deallocated when it's safe at class unloading, when
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139 // this class loader isn't unloaded itself.
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140 GrowableArray<Metadata*>* _deallocate_list;
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141
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142 // Support for walking class loader data objects
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143 ClassLoaderData* _next; /// Next loader_datas created
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144
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145 // ReadOnly and ReadWrite metaspaces (static because only on the null
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146 // class loader for now).
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147 static Metaspace* _ro_metaspace;
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148 static Metaspace* _rw_metaspace;
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149
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150 void set_next(ClassLoaderData* next) { _next = next; }
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151 ClassLoaderData* next() const { return _next; }
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152
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153 ClassLoaderData(Handle h_class_loader, bool is_anonymous);
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154 ~ClassLoaderData();
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155
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156 void set_metaspace(Metaspace* m) { _metaspace = m; }
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157
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158 JNIHandleBlock* handles() const;
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159 void set_handles(JNIHandleBlock* handles);
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160
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161 Mutex* metaspace_lock() const { return _metaspace_lock; }
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162
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163 // GC interface.
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164 void clear_claimed() { _claimed = 0; }
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165 bool claimed() const { return _claimed == 1; }
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166 bool claim();
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167
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168 void unload();
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169 bool keep_alive() const { return _keep_alive; }
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170 bool is_alive(BoolObjectClosure* is_alive_closure) const;
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171
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172 void classes_do(void f(InstanceKlass*));
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173
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174 // Deallocate free list during class unloading.
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175 void free_deallocate_list();
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176
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177 // Allocate out of this class loader data
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178 MetaWord* allocate(size_t size);
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179
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180 public:
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181 // Accessors
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182 Metaspace* metaspace_or_null() const { return _metaspace; }
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183
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184 static ClassLoaderData* the_null_class_loader_data() {
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185 return _the_null_class_loader_data;
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186 }
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187
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188 bool is_anonymous() const { return _is_anonymous; }
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189
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190 static void init_null_class_loader_data() {
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191 assert(_the_null_class_loader_data == NULL, "cannot initialize twice");
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192 assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice");
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193 _the_null_class_loader_data = new ClassLoaderData((oop)NULL, false);
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194 ClassLoaderDataGraph::_head = _the_null_class_loader_data;
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195 assert(_the_null_class_loader_data->is_the_null_class_loader_data(), "Must be");
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196 if (DumpSharedSpaces) {
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197 _the_null_class_loader_data->initialize_shared_metaspaces();
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198 }
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199 }
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200
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201 bool is_the_null_class_loader_data() const {
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202 return this == _the_null_class_loader_data;
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203 }
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204 bool is_ext_class_loader_data() const;
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205
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206 // The Metaspace is created lazily so may be NULL. This
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207 // method will allocate a Metaspace if needed.
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208 Metaspace* metaspace_non_null();
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209
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210 oop class_loader() const { return _class_loader; }
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211
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212 // Returns true if this class loader data is for a loader going away.
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213 bool is_unloading() const {
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214 assert(!(is_the_null_class_loader_data() && _unloading), "The null class loader can never be unloaded");
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215 return _unloading;
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216 }
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217 // Anonymous class loader data doesn't have anything to keep them from
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218 // being unloaded during parsing the anonymous class.
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219 void set_keep_alive(bool value) { _keep_alive = value; }
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220
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221 unsigned int identity_hash() {
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222 return _class_loader == NULL ? 0 : _class_loader->identity_hash();
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223 }
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224
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225 // Used when tracing from klasses.
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226 void oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim);
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227
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228 void classes_do(KlassClosure* klass_closure);
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229
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230 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; }
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231 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; }
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232
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233 void print_value() { print_value_on(tty); }
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234 void print_value_on(outputStream* out) const;
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235 void dump(outputStream * const out) PRODUCT_RETURN;
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236 void verify();
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237 const char* loader_name();
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238
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239 jobject add_handle(Handle h);
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240 void add_class(Klass* k);
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241 void remove_class(Klass* k);
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242 void record_dependency(Klass* to, TRAPS);
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243 void init_dependencies(TRAPS);
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244
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245 void add_to_deallocate_list(Metadata* m);
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246
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247 static ClassLoaderData* class_loader_data(oop loader);
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248 static ClassLoaderData* class_loader_data_or_null(oop loader);
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249 static ClassLoaderData* anonymous_class_loader_data(oop loader, TRAPS);
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250 static void print_loader(ClassLoaderData *loader_data, outputStream *out);
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251
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252 // CDS support
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253 Metaspace* ro_metaspace();
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254 Metaspace* rw_metaspace();
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255 void initialize_shared_metaspaces();
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256 };
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257
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258 class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
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259 ClassLoaderData* _data;
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260 public:
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261 ClassLoaderDataGraphMetaspaceIterator();
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262 ~ClassLoaderDataGraphMetaspaceIterator();
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263 bool repeat() { return _data != NULL; }
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264 Metaspace* get_next() {
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265 assert(_data != NULL, "Should not be NULL in call to the iterator");
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266 Metaspace* result = _data->metaspace_or_null();
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267 _data = _data->next();
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268 // This result might be NULL for class loaders without metaspace
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269 // yet. It would be nice to return only non-null results but
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270 // there is no guarantee that there will be a non-null result
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271 // down the list so the caller is going to have to check.
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272 return result;
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273 }
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274 };
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275 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP