Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/classLoaderData.cpp @ 6781:b711844284e2
7200092: Make NMT a bit friendlier to work with
Reviewed-by: kvn, ysr, azeemj
author | nloodin |
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date | Fri, 21 Sep 2012 10:56:28 +0200 |
parents | da91efe96a93 |
children | 90273fc0a981 |
rev | line source |
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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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306 return; |
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307 } |
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308 // Go backwards because this removes entries that are freed. |
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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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311 if (!m->on_stack()) { |
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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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314 // Cast them so they can be used by the template function. |
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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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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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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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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 } |
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364 #endif // CLD_DUMP_KLASSES |
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365 #undef CLD_DUMP_KLASSES |
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366 if (_jmethod_ids != NULL) { |
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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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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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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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380 if (metaspace_or_null() != NULL) { |
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381 metaspace_or_null()->verify(); |
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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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385 guarantee(k->class_loader_data() == this, "Must be the same"); |
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386 k->verify(); |
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387 } |
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388 } |
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389 |
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390 // GC root of class loader data created. |
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391 ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
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392 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
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393 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
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394 |
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395 |
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396 // Add a new class loader data node to the list. Assign the newly created |
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397 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
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398 ClassLoaderData* ClassLoaderDataGraph::add(ClassLoaderData** cld_addr, Handle loader_data) { |
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399 // Not assigned a class loader data yet. |
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400 // Create one. |
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401 ClassLoaderData* *list_head = &_head; |
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402 ClassLoaderData* next = _head; |
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403 ClassLoaderData* cld = new ClassLoaderData(loader_data); |
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404 |
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405 // First, Atomically set it. |
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406 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
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407 if (old != NULL) { |
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408 delete cld; |
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409 // Returns the data. |
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410 return old; |
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411 } |
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412 |
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413 // We won the race, and therefore the task of adding the data to the list of |
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414 // class loader data |
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415 do { |
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416 cld->set_next(next); |
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417 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
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418 if (exchanged == next) { |
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419 if (TraceClassLoaderData) { |
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420 tty->print("[ClassLoaderData: "); |
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421 tty->print("create class loader data "PTR_FORMAT, cld); |
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422 tty->print(" for instance "PTR_FORMAT" of ", cld->class_loader()); |
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423 loader_data->klass()->name()->print_symbol_on(tty); |
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424 tty->print_cr("]"); |
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425 } |
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426 return cld; |
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427 } |
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428 next = exchanged; |
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429 } while (true); |
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430 } |
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431 |
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432 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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433 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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434 cld->oops_do(f, klass_closure, must_claim); |
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435 } |
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436 } |
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437 |
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438 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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439 if (ClassUnloading) { |
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440 ClassLoaderData::the_null_class_loader_data()->oops_do(f, klass_closure, must_claim); |
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441 } else { |
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442 ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim); |
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443 } |
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444 } |
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445 |
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446 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
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447 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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448 cld->classes_do(klass_closure); |
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449 } |
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450 } |
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451 |
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452 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
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453 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
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454 |
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455 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
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456 |
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457 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
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458 ClassLoaderData* curr = _head; |
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459 while (curr != _saved_head) { |
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460 if (!curr->claimed()) { |
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461 array->push(curr); |
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462 |
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463 if (TraceClassLoaderData) { |
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464 tty->print("[ClassLoaderData] found new CLD: "); |
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465 curr->print_value_on(tty); |
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466 tty->cr(); |
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467 } |
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468 } |
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469 |
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470 curr = curr->_next; |
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471 } |
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472 |
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473 return array; |
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474 } |
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475 |
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476 #ifndef PRODUCT |
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477 // for debugging and hsfind(x) |
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478 bool ClassLoaderDataGraph::contains(address x) { |
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479 // I think we need the _metaspace_lock taken here because the class loader |
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480 // data graph could be changing while we are walking it (new entries added, |
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481 // new entries being unloaded, etc). |
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482 if (DumpSharedSpaces) { |
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483 // There are only two metaspaces to worry about. |
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484 ClassLoaderData* ncld = ClassLoaderData::the_null_class_loader_data(); |
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485 return (ncld->ro_metaspace()->contains(x) || ncld->rw_metaspace()->contains(x)); |
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486 } |
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487 |
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488 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(x)) { |
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489 return true; |
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490 } |
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491 |
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492 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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493 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
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494 return true; |
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495 } |
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496 } |
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497 |
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498 // Could also be on an unloading list which is okay, ie. still allocated |
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499 // for a little while. |
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500 for (ClassLoaderData* ucld = _unloading; ucld != NULL; ucld = ucld->next()) { |
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501 if (ucld->metaspace_or_null() != NULL && ucld->metaspace_or_null()->contains(x)) { |
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502 return true; |
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503 } |
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504 } |
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505 return false; |
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506 } |
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507 |
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508 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
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509 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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510 if (loader_data == data) { |
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511 return true; |
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512 } |
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513 } |
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514 |
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515 return false; |
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516 } |
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517 #endif // PRODUCT |
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518 |
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519 // Move class loader data from main list to the unloaded list for unloading |
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520 // and deallocation later. |
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521 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive) { |
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522 ClassLoaderData* data = _head; |
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523 ClassLoaderData* prev = NULL; |
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524 bool seen_dead_loader = false; |
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525 // mark metadata seen on the stack and code cache so we can delete |
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526 // unneeded entries. |
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527 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
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528 MetadataOnStackMark md_on_stack; |
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529 while (data != NULL) { |
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530 if (data->class_loader() == NULL || is_alive->do_object_b(data->class_loader())) { |
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531 assert(data->claimed(), "class loader data must have been claimed"); |
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532 if (has_redefined_a_class) { |
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533 data->classes_do(InstanceKlass::purge_previous_versions); |
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534 } |
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535 data->free_deallocate_list(); |
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536 prev = data; |
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537 data = data->next(); |
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538 continue; |
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539 } |
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540 seen_dead_loader = true; |
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541 ClassLoaderData* dead = data; |
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542 dead->mark_for_unload(); |
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543 if (TraceClassLoaderData) { |
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544 tty->print("[ClassLoaderData: unload loader data "PTR_FORMAT, dead); |
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545 tty->print(" for instance "PTR_FORMAT" of ", dead->class_loader()); |
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546 dead->class_loader()->klass()->name()->print_symbol_on(tty); |
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547 tty->print_cr("]"); |
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548 } |
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549 data = data->next(); |
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550 // Remove from loader list. |
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551 if (prev != NULL) { |
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552 prev->set_next(data); |
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553 } else { |
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554 assert(dead == _head, "sanity check"); |
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555 _head = data; |
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556 } |
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557 dead->set_next(_unloading); |
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558 _unloading = dead; |
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559 } |
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560 return seen_dead_loader; |
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561 } |
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562 |
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563 void ClassLoaderDataGraph::purge() { |
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564 ClassLoaderData* list = _unloading; |
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565 _unloading = NULL; |
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566 ClassLoaderData* next = list; |
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567 while (next != NULL) { |
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568 ClassLoaderData* purge_me = next; |
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569 next = purge_me->next(); |
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570 delete purge_me; |
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571 } |
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572 } |
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573 |
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574 // CDS support |
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575 |
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576 // Global metaspaces for writing information to the shared archive. When |
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577 // application CDS is supported, we may need one per metaspace, so this |
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578 // sort of looks like it. |
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579 Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
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580 Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
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581 static bool _shared_metaspaces_initialized = false; |
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582 |
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583 // Initialize shared metaspaces (change to call from somewhere not lazily) |
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584 void ClassLoaderData::initialize_shared_metaspaces() { |
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585 assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
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586 assert(this == ClassLoaderData::the_null_class_loader_data(), |
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587 "only supported for null loader data for now"); |
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588 assert (!_shared_metaspaces_initialized, "only initialize once"); |
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589 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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590 _ro_metaspace = new Metaspace(_metaspace_lock, SharedReadOnlySize/wordSize); |
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591 _rw_metaspace = new Metaspace(_metaspace_lock, SharedReadWriteSize/wordSize); |
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592 _shared_metaspaces_initialized = true; |
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593 } |
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594 |
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595 Metaspace* ClassLoaderData::ro_metaspace() { |
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596 assert(_ro_metaspace != NULL, "should already be initialized"); |
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597 return _ro_metaspace; |
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598 } |
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599 |
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600 Metaspace* ClassLoaderData::rw_metaspace() { |
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601 assert(_rw_metaspace != NULL, "should already be initialized"); |
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602 return _rw_metaspace; |
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603 } |
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604 |
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605 |
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606 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
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607 _data = ClassLoaderDataGraph::_head; |
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608 } |
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609 |
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610 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
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611 |
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612 #ifndef PRODUCT |
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613 // callable from debugger |
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614 extern "C" int print_loader_data_graph() { |
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615 ClassLoaderDataGraph::dump_on(tty); |
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616 return 0; |
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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 |