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annotate src/share/vm/classfile/classLoaderData.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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children e861d44e0c9c
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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 bool has_defined(Klass* klass) {
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208 for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
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209 if (klass == k) {
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210 return true;
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211 }
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212 }
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213 return false;
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214 }
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215
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216 JNIMethodBlock* jmethod_ids() const { return _jmethod_ids; }
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217 void set_jmethod_ids(JNIMethodBlock* new_block) { _jmethod_ids = new_block; }
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218
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219 void print_value() { print_value_on(tty); }
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220 void print_value_on(outputStream* out) const PRODUCT_RETURN;
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221 void dump(outputStream * const out) PRODUCT_RETURN;
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222 void verify();
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223
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224 jobject add_handle(Handle h);
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225 void add_class(Klass* k);
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226 void remove_class(Klass* k);
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227 void record_dependency(Klass* to, TRAPS);
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228
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229 void add_to_deallocate_list(Metadata* m);
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230
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231 static ClassLoaderData* class_loader_data(oop loader);
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232 static void print_loader(ClassLoaderData *loader_data, outputStream *out);
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233
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234 // CDS support
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235 Metaspace* ro_metaspace();
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236 Metaspace* rw_metaspace();
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237 void initialize_shared_metaspaces();
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238 };
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239
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240 class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
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241 ClassLoaderData* _data;
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242 public:
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243 ClassLoaderDataGraphMetaspaceIterator();
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244 ~ClassLoaderDataGraphMetaspaceIterator();
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245 bool repeat() { return _data != NULL; }
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246 Metaspace* get_next() {
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247 assert(_data != NULL, "Should not be NULL in call to the iterator");
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248 Metaspace* result = _data->metaspace_or_null();
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249 _data = _data->next();
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250 // This result might be NULL for class loaders without metaspace
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251 // yet. It would be nice to return only non-null results but
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252 // there is no guarantee that there will be a non-null result
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253 // down the list so the caller is going to have to check.
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254 return result;
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255 }
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256 };
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257 #endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP