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annotate src/share/vm/classfile/classLoaderData.cpp @ 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 90273fc0a981
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6725
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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 // A ClassLoaderData identifies the full set of class types that a class
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26 // loader's name resolution strategy produces for a given configuration of the
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27 // class loader.
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28 // Class types in the ClassLoaderData may be defined by from class file binaries
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29 // provided by the class loader, or from other class loader it interacts with
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30 // according to its name resolution strategy.
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31 //
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32 // Class loaders that implement a deterministic name resolution strategy
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33 // (including with respect to their delegation behavior), such as the boot, the
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34 // extension, and the system loaders of the JDK's built-in class loader
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35 // hierarchy, always produce the same linkset for a given configuration.
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36 //
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37 // ClassLoaderData carries information related to a linkset (e.g.,
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38 // metaspace holding its klass definitions).
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39 // The System Dictionary and related data structures (e.g., placeholder table,
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40 // loader constraints table) as well as the runtime representation of classes
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41 // only reference ClassLoaderData.
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42 //
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43 // Instances of java.lang.ClassLoader holds a pointer to a ClassLoaderData that
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44 // that represent the loader's "linking domain" in the JVM.
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45 //
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46 // The bootstrap loader (represented by NULL) also has a ClassLoaderData,
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47 // the singleton class the_null_class_loader_data().
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48
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49 #include "precompiled.hpp"
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50 #include "classfile/classLoaderData.hpp"
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51 #include "classfile/classLoaderData.inline.hpp"
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52 #include "classfile/javaClasses.hpp"
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53 #include "classfile/systemDictionary.hpp"
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54 #include "code/codeCache.hpp"
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55 #include "memory/metadataFactory.hpp"
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56 #include "memory/metaspaceShared.hpp"
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57 #include "prims/jvmtiRedefineClasses.hpp"
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58 #include "runtime/jniHandles.hpp"
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59 #include "runtime/mutex.hpp"
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60 #include "runtime/safepoint.hpp"
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61 #include "runtime/synchronizer.hpp"
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62 #include "utilities/growableArray.hpp"
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63 #include "utilities/ostream.hpp"
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64
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65 ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL;
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66
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67 ClassLoaderData::ClassLoaderData(Handle h_class_loader) : _class_loader(h_class_loader()),
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68 _metaspace(NULL), _unloading(false), _klasses(NULL),
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69 _claimed(0), _jmethod_ids(NULL), _handles(NULL),
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70 _deallocate_list(NULL), _next(NULL),
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71 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) {
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72 // empty
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73 }
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74
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75 bool ClassLoaderData::claim() {
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76 if (_claimed == 1) {
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77 return false;
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78 }
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79
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80 return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0;
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81 }
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82
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83 void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
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84 if (must_claim && !claim()) {
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85 return;
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86 }
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87
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88 f->do_oop(&_class_loader);
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89 _handles->oops_do(f);
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90 if (klass_closure != NULL) {
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91 classes_do(klass_closure);
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92 }
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93 }
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94
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95 void ClassLoaderData::classes_do(KlassClosure* klass_closure) {
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96 for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
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97 klass_closure->do_klass(k);
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98 }
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99 }
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100
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101 void ClassLoaderData::classes_do(void f(InstanceKlass*)) {
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102 for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
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103 if (k->oop_is_instance()) {
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104 f(InstanceKlass::cast(k));
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105 }
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106 }
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107 }
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108
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109 void ClassLoaderData::record_dependency(Klass* k, TRAPS) {
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110 ClassLoaderData * const from_cld = this;
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111 ClassLoaderData * const to_cld = k->class_loader_data();
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112
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113 // Records dependency between non-null class loaders only.
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114 if (to_cld->is_the_null_class_loader_data() || from_cld->is_the_null_class_loader_data()) {
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115 return;
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116 }
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117
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118 // Check that this dependency isn't from the same or parent class_loader
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119 oop to = to_cld->class_loader();
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120 oop from = from_cld->class_loader();
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121
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122 oop curr = from;
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123 while (curr != NULL) {
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124 if (curr == to) {
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125 return; // this class loader is in the parent list, no need to add it.
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126 }
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127 curr = java_lang_ClassLoader::parent(curr);
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128 }
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129
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130 // It's a dependency we won't find through GC, add it. This is relatively rare
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131 from_cld->add_dependency(to_cld, CHECK);
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132 }
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133
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134 bool ClassLoaderData::has_dependency(ClassLoaderData* dependency) {
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135 oop loader = dependency->class_loader();
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136
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137 // Get objArrayOop out of the class_loader oop and see if this dependency
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138 // is there. Don't safepoint! These are all oops.
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139 // Dependency list is (oop class_loader, objArrayOop next)
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140 objArrayOop ok = (objArrayOop)java_lang_ClassLoader::dependencies(class_loader());
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141 while (ok != NULL) {
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142 if (ok->obj_at(0) == loader) {
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143 return true;
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144 }
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145 ok = (objArrayOop)ok->obj_at(1);
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146 }
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147 return false;
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148 }
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149
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150 void ClassLoaderData::add_dependency(ClassLoaderData* dependency, TRAPS) {
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151 // Minimize the number of duplicates in the list.
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152 if (has_dependency(dependency)) {
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153 return;
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154 }
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155
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156 // Create a new dependency node with fields for (class_loader, next)
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157 objArrayOop deps = oopFactory::new_objectArray(2, CHECK);
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158 deps->obj_at_put(0, dependency->class_loader());
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159
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160 // Add this lock free, using compare and exchange, need barriers for GC
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161 // Do the barrier first.
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162 HeapWord* addr = java_lang_ClassLoader::dependencies_addr(class_loader());
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163 while (true) {
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164 oop old_dependency = java_lang_ClassLoader::dependencies(class_loader());
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165 deps->obj_at_put(1, old_dependency);
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166
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167 oop newold = oopDesc::atomic_compare_exchange_oop((oop)deps, addr, old_dependency, true);
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168 if (newold == old_dependency) {
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169 update_barrier_set((void*)addr, (oop)deps);
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170 // we won the race to add this dependency
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171 break;
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172 }
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173 }
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174 }
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175
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176
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177 void ClassLoaderDataGraph::clear_claimed_marks() {
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178 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
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179 cld->clear_claimed();
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180 }
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181 }
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182
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183 void ClassLoaderData::add_class(Klass* k) {
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184 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
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185 Klass* old_value = _klasses;
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186 k->set_next_link(old_value);
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187 // link the new item into the list
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188 _klasses = k;
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189
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190 if (TraceClassLoaderData && k->class_loader_data() != NULL) {
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191 ResourceMark rm;
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192 tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: "
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193 PTR_FORMAT " loader: " PTR_FORMAT " %s",
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194 k,
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195 k->external_name(),
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196 k->class_loader_data(),
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197 k->class_loader(),
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198 k->class_loader() != NULL ? k->class_loader()->klass()->external_name() : "NULL"
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199 );
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200 }
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201 }
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202
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203 // This is called by InstanceKlass::deallocate_contents() to remove the
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204 // scratch_class for redefine classes. We need a lock because there it may not
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205 // be called at a safepoint if there's an error.
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206 void ClassLoaderData::remove_class(Klass* scratch_class) {
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207 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
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208 Klass* prev = NULL;
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209 for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
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210 if (k == scratch_class) {
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211 if (prev == NULL) {
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212 _klasses = k->next_link();
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213 } else {
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214 Klass* next = k->next_link();
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215 prev->set_next_link(next);
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216 }
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217 return;
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218 }
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219 prev = k;
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220 }
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221 ShouldNotReachHere(); // should have found this class!!
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222 }
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223
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224 ClassLoaderData::~ClassLoaderData() {
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225 Metaspace *m = _metaspace;
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226 if (m != NULL) {
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227 _metaspace = NULL;
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228 // release the metaspace
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229 delete m;
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230 // release the handles
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231 if (_handles != NULL) {
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232 JNIHandleBlock::release_block(_handles);
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233 _handles = NULL;
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234 }
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235 }
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236
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237 // Clear all the JNI handles for methods
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238 // These aren't deallocated and are going to look like a leak, but that's
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239 // needed because we can't really get rid of jmethodIDs because we don't
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240 // know when native code is going to stop using them. The spec says that
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241 // they're "invalid" but existing programs likely rely on their being
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242 // NULL after class unloading.
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243 if (_jmethod_ids != NULL) {
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244 Method::clear_jmethod_ids(this);
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245 }
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246 // Delete lock
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247 delete _metaspace_lock;
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248
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249 // Delete free list
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250 if (_deallocate_list != NULL) {
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251 delete _deallocate_list;
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252 }
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253 }
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254
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255 Metaspace* ClassLoaderData::metaspace_non_null() {
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256 // If the metaspace has not been allocated, create a new one. Might want
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257 // to create smaller arena for Reflection class loaders also.
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258 // The reason for the delayed allocation is because some class loaders are
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259 // simply for delegating with no metadata of their own.
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260 if (_metaspace == NULL) {
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261 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
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262 // Check again if metaspace has been allocated while we were getting this lock.
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263 if (_metaspace != NULL) {
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264 return _metaspace;
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265 }
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266 if (class_loader() == NULL) {
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267 assert(this == the_null_class_loader_data(), "Must be");
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268 size_t word_size = Metaspace::first_chunk_word_size();
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269 set_metaspace(new Metaspace(_metaspace_lock, word_size));
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270 } else {
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271 set_metaspace(new Metaspace(_metaspace_lock)); // default size for now.
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272 }
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273 }
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274 return _metaspace;
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275 }
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276
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277 JNIHandleBlock* ClassLoaderData::handles() const { return _handles; }
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278 void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; }
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279
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280 jobject ClassLoaderData::add_handle(Handle h) {
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281 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
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282 if (handles() == NULL) {
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283 set_handles(JNIHandleBlock::allocate_block());
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284 }
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285 return handles()->allocate_handle(h());
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286 }
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287
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288 // Add this metadata pointer to be freed when it's safe. This is only during
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289 // class unloading because Handles might point to this metadata field.
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290 void ClassLoaderData::add_to_deallocate_list(Metadata* m) {
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291 // Metadata in shared region isn't deleted.
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292 if (!m->is_shared()) {
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293 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
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294 if (_deallocate_list == NULL) {
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295 _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true);
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296 }
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297 _deallocate_list->append_if_missing(m);
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298 }
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299 }
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300
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301 // Deallocate free metadata on the free list. How useful the PermGen was!
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302 void ClassLoaderData::free_deallocate_list() {
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303 // Don't need lock, at safepoint
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304 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
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305 if (_deallocate_list == NULL) {
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coleenp
parents:
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306 return;
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coleenp
parents:
diff changeset
307 }
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coleenp
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308 // Go backwards because this removes entries that are freed.
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coleenp
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309 for (int i = _deallocate_list->length() - 1; i >= 0; i--) {
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310 Metadata* m = _deallocate_list->at(i);
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parents:
diff changeset
311 if (!m->on_stack()) {
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diff changeset
312 _deallocate_list->remove_at(i);
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313 // There are only three types of metadata that we deallocate directly.
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coleenp
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314 // Cast them so they can be used by the template function.
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parents:
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315 if (m->is_method()) {
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316 MetadataFactory::free_metadata(this, (Method*)m);
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317 } else if (m->is_constantPool()) {
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318 MetadataFactory::free_metadata(this, (ConstantPool*)m);
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319 } else if (m->is_klass()) {
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320 MetadataFactory::free_metadata(this, (InstanceKlass*)m);
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321 } else {
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322 ShouldNotReachHere();
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323 }
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324 }
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parents:
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325 }
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326 }
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327
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328 #ifndef PRODUCT
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329 void ClassLoaderData::print_loader(ClassLoaderData *loader_data, outputStream* out) {
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330 oop class_loader = loader_data->class_loader();
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331 out->print("%s", SystemDictionary::loader_name(class_loader));
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332 }
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333
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334 // Define to dump klasses
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335 #undef CLD_DUMP_KLASSES
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336
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337 void ClassLoaderData::dump(outputStream * const out) {
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338 ResourceMark rm;
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339 out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {",
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340 this, class_loader(),
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341 class_loader() != NULL ? class_loader()->klass() : NULL,
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342 class_loader() != NULL ? class_loader()->klass()->external_name() : "NULL");
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343 if (claimed()) out->print(" claimed ");
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344 if (is_unloading()) out->print(" unloading ");
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345 out->print(" handles " INTPTR_FORMAT, handles());
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346 out->cr();
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347 if (metaspace_or_null() != NULL) {
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348 out->print_cr("metaspace: " PTR_FORMAT, metaspace_or_null());
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349 metaspace_or_null()->dump(out);
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350 } else {
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351 out->print_cr("metaspace: NULL");
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352 }
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353
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354 #ifdef CLD_DUMP_KLASSES
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parents:
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355 if (Verbose) {
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356 ResourceMark rm;
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357 Klass* k = _klasses;
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358 while (k != NULL) {
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359 out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(),
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coleenp
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360 k->has_modified_oops(), k->has_accumulated_modified_oops());
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361 k = k->next_link();
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362 }
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363 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
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diff changeset
364 #endif // CLD_DUMP_KLASSES
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coleenp
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365 #undef CLD_DUMP_KLASSES
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366 if (_jmethod_ids != NULL) {
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coleenp
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367 Method::print_jmethod_ids(this, out);
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368 }
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369 out->print_cr("}");
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370 }
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coleenp
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371 #endif // PRODUCT
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372
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373 void ClassLoaderData::verify() {
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374 oop cl = class_loader();
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375
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coleenp
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376 guarantee(this == class_loader_data(cl), "Must be the same");
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377 guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data(), "must be");
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378
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379 // Verify the integrity of the allocated space.
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coleenp
parents:
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380 if (metaspace_or_null() != NULL) {
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coleenp
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381 metaspace_or_null()->verify();
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coleenp
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382 }
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383
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384 for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
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coleenp
parents:
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385 guarantee(k->class_loader_data() == this, "Must be the same");
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coleenp
parents:
diff changeset
386 k->verify();
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coleenp
parents:
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387 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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388 }
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coleenp
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389
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coleenp
parents:
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390 // GC root of class loader data created.
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coleenp
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391 ClassLoaderData* ClassLoaderDataGraph::_head = NULL;
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392 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL;
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coleenp
parents:
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393 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
394
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
395
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
396 // Add a new class loader data node to the list. Assign the newly created
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
397 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field
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coleenp
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398 ClassLoaderData* ClassLoaderDataGraph::add(ClassLoaderData** cld_addr, Handle loader_data) {
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coleenp
parents:
diff changeset
399 // Not assigned a class loader data yet.
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coleenp
parents:
diff changeset
400 // Create one.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
401 ClassLoaderData* *list_head = &_head;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
402 ClassLoaderData* next = _head;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
403 ClassLoaderData* cld = new ClassLoaderData(loader_data);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
404
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
405 // First, Atomically set it.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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406 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
407 if (old != NULL) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
408 delete cld;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
409 // Returns the data.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
410 return old;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
411 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
412
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
413 // We won the race, and therefore the task of adding the data to the list of
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
414 // class loader data
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
415 do {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
416 cld->set_next(next);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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417 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next);
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coleenp
parents:
diff changeset
418 if (exchanged == next) {
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coleenp
parents:
diff changeset
419 if (TraceClassLoaderData) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
420 tty->print("[ClassLoaderData: ");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
421 tty->print("create class loader data "PTR_FORMAT, cld);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
422 tty->print(" for instance "PTR_FORMAT" of ", cld->class_loader());
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coleenp
parents:
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423 loader_data->klass()->name()->print_symbol_on(tty);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
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424 tty->print_cr("]");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
425 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
426 return cld;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
427 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
428 next = exchanged;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
429 } while (true);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
430 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
431
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff changeset
432 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
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coleenp
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diff changeset
433 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
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coleenp
parents:
diff changeset
434 cld->oops_do(f, klass_closure, must_claim);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
435 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
436 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
437
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
438 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
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coleenp
parents:
diff changeset
439 if (ClassUnloading) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
440 ClassLoaderData::the_null_class_loader_data()->oops_do(f, klass_closure, must_claim);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
441 } else {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
442 ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
443 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
444 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
445
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
446 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
447 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
448 cld->classes_do(klass_closure);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
449 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
450 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
451
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
452 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
453 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
454
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
455 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
456
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
457 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
458 ClassLoaderData* curr = _head;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
459 while (curr != _saved_head) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
460 if (!curr->claimed()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
461 array->push(curr);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
462
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
463 if (TraceClassLoaderData) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
464 tty->print("[ClassLoaderData] found new CLD: ");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
465 curr->print_value_on(tty);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
466 tty->cr();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
467 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
468 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
469
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
470 curr = curr->_next;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
471 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
472
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
473 return array;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
474 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
475
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
476 #ifndef PRODUCT
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
477 // for debugging and hsfind(x)
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
478 bool ClassLoaderDataGraph::contains(address x) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
479 // I think we need the _metaspace_lock taken here because the class loader
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
480 // data graph could be changing while we are walking it (new entries added,
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
481 // new entries being unloaded, etc).
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
482 if (DumpSharedSpaces) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
483 // There are only two metaspaces to worry about.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
484 ClassLoaderData* ncld = ClassLoaderData::the_null_class_loader_data();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
485 return (ncld->ro_metaspace()->contains(x) || ncld->rw_metaspace()->contains(x));
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
486 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
487
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
488 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(x)) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
489 return true;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
490 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
491
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
492 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
493 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
494 return true;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
495 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
496 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
497
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
498 // Could also be on an unloading list which is okay, ie. still allocated
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
499 // for a little while.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
500 for (ClassLoaderData* ucld = _unloading; ucld != NULL; ucld = ucld->next()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
501 if (ucld->metaspace_or_null() != NULL && ucld->metaspace_or_null()->contains(x)) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
502 return true;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
503 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
504 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
505 return false;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
506 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
507
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
508 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
509 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
510 if (loader_data == data) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
511 return true;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
512 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
513 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
514
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
515 return false;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
516 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
517 #endif // PRODUCT
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
518
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
519 // Move class loader data from main list to the unloaded list for unloading
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
520 // and deallocation later.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
521 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
522 ClassLoaderData* data = _head;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
523 ClassLoaderData* prev = NULL;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
524 bool seen_dead_loader = false;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
525 // mark metadata seen on the stack and code cache so we can delete
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
526 // unneeded entries.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
527 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
528 MetadataOnStackMark md_on_stack;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
529 while (data != NULL) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
530 if (data->class_loader() == NULL || is_alive->do_object_b(data->class_loader())) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
531 assert(data->claimed(), "class loader data must have been claimed");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
532 if (has_redefined_a_class) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
533 data->classes_do(InstanceKlass::purge_previous_versions);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
534 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
535 data->free_deallocate_list();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
536 prev = data;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
537 data = data->next();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
538 continue;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
539 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
540 seen_dead_loader = true;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
541 ClassLoaderData* dead = data;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
542 dead->mark_for_unload();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
543 if (TraceClassLoaderData) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
544 tty->print("[ClassLoaderData: unload loader data "PTR_FORMAT, dead);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
545 tty->print(" for instance "PTR_FORMAT" of ", dead->class_loader());
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
546 dead->class_loader()->klass()->name()->print_symbol_on(tty);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
547 tty->print_cr("]");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
548 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
549 data = data->next();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
550 // Remove from loader list.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
551 if (prev != NULL) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
552 prev->set_next(data);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
553 } else {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
554 assert(dead == _head, "sanity check");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
555 _head = data;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
556 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
557 dead->set_next(_unloading);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
558 _unloading = dead;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
559 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
560 return seen_dead_loader;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
561 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
562
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
563 void ClassLoaderDataGraph::purge() {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
564 ClassLoaderData* list = _unloading;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
565 _unloading = NULL;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
566 ClassLoaderData* next = list;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
567 while (next != NULL) {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
568 ClassLoaderData* purge_me = next;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
569 next = purge_me->next();
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
570 delete purge_me;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
571 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
572 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
573
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
574 // CDS support
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
575
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
576 // Global metaspaces for writing information to the shared archive. When
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
577 // application CDS is supported, we may need one per metaspace, so this
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
578 // sort of looks like it.
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
579 Metaspace* ClassLoaderData::_ro_metaspace = NULL;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
580 Metaspace* ClassLoaderData::_rw_metaspace = NULL;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
581 static bool _shared_metaspaces_initialized = false;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
582
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
583 // Initialize shared metaspaces (change to call from somewhere not lazily)
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
584 void ClassLoaderData::initialize_shared_metaspaces() {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
585 assert(DumpSharedSpaces, "only use this for dumping shared spaces");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
586 assert(this == ClassLoaderData::the_null_class_loader_data(),
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
587 "only supported for null loader data for now");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
588 assert (!_shared_metaspaces_initialized, "only initialize once");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
589 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
590 _ro_metaspace = new Metaspace(_metaspace_lock, SharedReadOnlySize/wordSize);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
591 _rw_metaspace = new Metaspace(_metaspace_lock, SharedReadWriteSize/wordSize);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
592 _shared_metaspaces_initialized = true;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
593 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
594
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
595 Metaspace* ClassLoaderData::ro_metaspace() {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
596 assert(_ro_metaspace != NULL, "should already be initialized");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
597 return _ro_metaspace;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
598 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
599
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
600 Metaspace* ClassLoaderData::rw_metaspace() {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
601 assert(_rw_metaspace != NULL, "should already be initialized");
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
602 return _rw_metaspace;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
603 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
604
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
605
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
606 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
607 _data = ClassLoaderDataGraph::_head;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
608 }
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
609
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
610 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {}
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
611
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
612 #ifndef PRODUCT
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
613 // callable from debugger
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
614 extern "C" int print_loader_data_graph() {
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
615 ClassLoaderDataGraph::dump_on(tty);
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
616 return 0;
da91efe96a93 6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff changeset
617 }
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618
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619 void ClassLoaderDataGraph::verify() {
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620 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
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621 data->verify();
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622 }
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623 }
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624
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625 void ClassLoaderDataGraph::dump_on(outputStream * const out) {
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626 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
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627 data->dump(out);
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628 }
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629 MetaspaceAux::dump(out);
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630 }
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631
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632 void ClassLoaderData::print_value_on(outputStream* out) const {
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633 if (class_loader() == NULL) {
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634 out->print_cr("NULL class_loader");
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635 } else {
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636 out->print("class loader "PTR_FORMAT, this);
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637 class_loader()->print_value_on(out);
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638 }
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639 }
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640 #endif // PRODUCT