Mercurial > hg > graal-jvmci-8
annotate src/share/vm/classfile/classLoaderData.cpp @ 23086:bf41eee321e5
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Reviewed-by: kvn
author | vlivanov |
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date | Thu, 11 Jun 2015 14:19:40 +0300 |
parents | bd8725e80355 |
children | dd9cc155639c 619e7d418a44 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 // 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/metadataOnStackMark.hpp" |
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54 #include "classfile/systemDictionary.hpp" |
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55 #include "code/codeCache.hpp" |
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56 #include "memory/gcLocker.hpp" |
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57 #include "memory/metadataFactory.hpp" |
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58 #include "memory/metaspaceShared.hpp" |
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59 #include "memory/oopFactory.hpp" |
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60 #include "runtime/jniHandles.hpp" |
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61 #include "runtime/mutex.hpp" |
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62 #include "runtime/safepoint.hpp" |
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63 #include "runtime/synchronizer.hpp" |
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64 #include "utilities/growableArray.hpp" |
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65 #include "utilities/macros.hpp" |
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66 #include "utilities/ostream.hpp" |
10405 | 67 #if INCLUDE_TRACE |
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68 #include "trace/tracing.hpp" |
10405 | 69 #endif |
70 | |
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71 ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL; |
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72 |
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73 ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies) : |
7409 | 74 _class_loader(h_class_loader()), |
20260 | 75 _is_anonymous(is_anonymous), |
76 // An anonymous class loader data doesn't have anything to keep | |
77 // it from being unloaded during parsing of the anonymous class. | |
78 // The null-class-loader should always be kept alive. | |
79 _keep_alive(is_anonymous || h_class_loader.is_null()), | |
7409 | 80 _metaspace(NULL), _unloading(false), _klasses(NULL), |
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81 _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL), |
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82 _next(NULL), _dependencies(dependencies), |
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83 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) { |
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84 // empty |
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85 } |
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86 |
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87 void ClassLoaderData::init_dependencies(TRAPS) { |
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88 assert(!Universe::is_fully_initialized(), "should only be called when initializing"); |
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89 assert(is_the_null_class_loader_data(), "should only call this for the null class loader"); |
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90 _dependencies.init(CHECK); |
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91 } |
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92 |
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93 void ClassLoaderData::Dependencies::init(TRAPS) { |
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94 // Create empty dependencies array to add to. CMS requires this to be |
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95 // an oop so that it can track additions via card marks. We think. |
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96 _list_head = oopFactory::new_objectArray(2, CHECK); |
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97 } |
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98 |
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99 bool ClassLoaderData::claim() { |
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100 if (_claimed == 1) { |
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101 return false; |
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102 } |
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103 |
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104 return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0; |
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105 } |
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106 |
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107 void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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108 if (must_claim && !claim()) { |
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109 return; |
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110 } |
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111 |
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112 f->do_oop(&_class_loader); |
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113 _dependencies.oops_do(f); |
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114 _handles->oops_do(f); |
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115 if (klass_closure != NULL) { |
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116 classes_do(klass_closure); |
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117 } |
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118 } |
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119 |
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120 void ClassLoaderData::Dependencies::oops_do(OopClosure* f) { |
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121 f->do_oop((oop*)&_list_head); |
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122 } |
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123 |
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124 void ClassLoaderData::classes_do(KlassClosure* klass_closure) { |
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125 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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126 klass_closure->do_klass(k); |
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127 assert(k != k->next_link(), "no loops!"); |
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128 } |
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129 } |
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130 |
10405 | 131 void ClassLoaderData::classes_do(void f(Klass * const)) { |
132 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { | |
133 f(k); | |
134 } | |
135 } | |
136 | |
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137 void ClassLoaderData::loaded_classes_do(KlassClosure* klass_closure) { |
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138 // Lock to avoid classes being modified/added/removed during iteration |
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139 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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140 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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141 // Do not filter ArrayKlass oops here... |
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142 if (k->oop_is_array() || (k->oop_is_instance() && InstanceKlass::cast(k)->is_loaded())) { |
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143 klass_closure->do_klass(k); |
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144 } |
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145 } |
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146 } |
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147 |
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148 void ClassLoaderData::classes_do(void f(InstanceKlass*)) { |
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149 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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150 if (k->oop_is_instance()) { |
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151 f(InstanceKlass::cast(k)); |
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152 } |
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153 assert(k != k->next_link(), "no loops!"); |
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154 } |
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155 } |
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156 |
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157 void ClassLoaderData::record_dependency(Klass* k, TRAPS) { |
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158 ClassLoaderData * const from_cld = this; |
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159 ClassLoaderData * const to_cld = k->class_loader_data(); |
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160 |
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161 // Dependency to the null class loader data doesn't need to be recorded |
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162 // because the null class loader data never goes away. |
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163 if (to_cld->is_the_null_class_loader_data()) { |
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164 return; |
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165 } |
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166 |
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167 oop to; |
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168 if (to_cld->is_anonymous()) { |
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169 // Anonymous class dependencies are through the mirror. |
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170 to = k->java_mirror(); |
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171 } else { |
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172 to = to_cld->class_loader(); |
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173 |
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174 // If from_cld is anonymous, even if it's class_loader is a parent of 'to' |
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175 // we still have to add it. The class_loader won't keep from_cld alive. |
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176 if (!from_cld->is_anonymous()) { |
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177 // Check that this dependency isn't from the same or parent class_loader |
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178 oop from = from_cld->class_loader(); |
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179 |
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180 oop curr = from; |
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181 while (curr != NULL) { |
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182 if (curr == to) { |
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183 return; // this class loader is in the parent list, no need to add it. |
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184 } |
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185 curr = java_lang_ClassLoader::parent(curr); |
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186 } |
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187 } |
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188 } |
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189 |
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190 // It's a dependency we won't find through GC, add it. This is relatively rare |
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191 // Must handle over GC point. |
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192 Handle dependency(THREAD, to); |
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193 from_cld->_dependencies.add(dependency, CHECK); |
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194 } |
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195 |
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196 |
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197 void ClassLoaderData::Dependencies::add(Handle dependency, TRAPS) { |
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198 // Check first if this dependency is already in the list. |
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199 // Save a pointer to the last to add to under the lock. |
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200 objArrayOop ok = _list_head; |
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201 objArrayOop last = NULL; |
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202 while (ok != NULL) { |
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203 last = ok; |
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204 if (ok->obj_at(0) == dependency()) { |
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205 // Don't need to add it |
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206 return; |
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207 } |
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208 ok = (objArrayOop)ok->obj_at(1); |
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209 } |
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210 |
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211 // Must handle over GC points |
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212 assert (last != NULL, "dependencies should be initialized"); |
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213 objArrayHandle last_handle(THREAD, last); |
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214 |
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215 // Create a new dependency node with fields for (class_loader or mirror, next) |
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216 objArrayOop deps = oopFactory::new_objectArray(2, CHECK); |
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217 deps->obj_at_put(0, dependency()); |
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218 |
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219 // Must handle over GC points |
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220 objArrayHandle new_dependency(THREAD, deps); |
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221 |
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222 // Add the dependency under lock |
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223 locked_add(last_handle, new_dependency, THREAD); |
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224 } |
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225 |
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226 void ClassLoaderData::Dependencies::locked_add(objArrayHandle last_handle, |
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227 objArrayHandle new_dependency, |
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228 Thread* THREAD) { |
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229 |
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230 // Have to lock and put the new dependency on the end of the dependency |
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231 // array so the card mark for CMS sees that this dependency is new. |
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232 // Can probably do this lock free with some effort. |
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233 ObjectLocker ol(Handle(THREAD, _list_head), THREAD); |
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234 |
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235 oop loader_or_mirror = new_dependency->obj_at(0); |
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236 |
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237 // Since the dependencies are only added, add to the end. |
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238 objArrayOop end = last_handle(); |
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239 objArrayOop last = NULL; |
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240 while (end != NULL) { |
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241 last = end; |
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242 // check again if another thread added it to the end. |
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243 if (end->obj_at(0) == loader_or_mirror) { |
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244 // Don't need to add it |
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245 return; |
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246 } |
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247 end = (objArrayOop)end->obj_at(1); |
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248 } |
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249 assert (last != NULL, "dependencies should be initialized"); |
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250 // fill in the first element with the oop in new_dependency. |
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251 if (last->obj_at(0) == NULL) { |
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252 last->obj_at_put(0, new_dependency->obj_at(0)); |
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253 } else { |
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254 last->obj_at_put(1, new_dependency()); |
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255 } |
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256 } |
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257 |
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258 void ClassLoaderDataGraph::clear_claimed_marks() { |
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259 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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260 cld->clear_claimed(); |
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261 } |
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262 } |
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263 |
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264 void ClassLoaderData::add_class(Klass* k) { |
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265 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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266 Klass* old_value = _klasses; |
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267 k->set_next_link(old_value); |
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268 // link the new item into the list |
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269 _klasses = k; |
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270 |
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271 if (TraceClassLoaderData && Verbose && k->class_loader_data() != NULL) { |
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272 ResourceMark rm; |
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273 tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: " |
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274 PTR_FORMAT " loader: " PTR_FORMAT " %s", |
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275 p2i(k), |
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276 k->external_name(), |
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277 p2i(k->class_loader_data()), |
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278 p2i((void *)k->class_loader()), |
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279 loader_name()); |
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280 } |
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281 } |
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282 |
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283 // This is called by InstanceKlass::deallocate_contents() to remove the |
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284 // scratch_class for redefine classes. We need a lock because there it may not |
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285 // be called at a safepoint if there's an error. |
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286 void ClassLoaderData::remove_class(Klass* scratch_class) { |
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287 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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288 Klass* prev = NULL; |
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289 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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290 if (k == scratch_class) { |
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291 if (prev == NULL) { |
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292 _klasses = k->next_link(); |
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293 } else { |
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294 Klass* next = k->next_link(); |
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295 prev->set_next_link(next); |
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296 } |
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297 return; |
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298 } |
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299 prev = k; |
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300 assert(k != k->next_link(), "no loops!"); |
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301 } |
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302 ShouldNotReachHere(); // should have found this class!! |
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303 } |
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304 |
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305 void ClassLoaderData::unload() { |
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306 _unloading = true; |
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307 |
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308 // Tell serviceability tools these classes are unloading |
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309 classes_do(InstanceKlass::notify_unload_class); |
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310 |
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311 if (TraceClassLoaderData) { |
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312 ResourceMark rm; |
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313 tty->print("[ClassLoaderData: unload loader data " INTPTR_FORMAT, p2i(this)); |
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314 tty->print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)class_loader()), |
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315 loader_name()); |
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316 if (is_anonymous()) { |
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317 tty->print(" for anonymous class " INTPTR_FORMAT " ", p2i(_klasses)); |
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318 } |
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319 tty->print_cr("]"); |
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320 } |
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321 } |
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322 |
20260 | 323 oop ClassLoaderData::keep_alive_object() const { |
324 assert(!keep_alive(), "Don't use with CLDs that are artificially kept alive"); | |
325 return is_anonymous() ? _klasses->java_mirror() : class_loader(); | |
326 } | |
327 | |
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328 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { |
20260 | 329 bool alive = keep_alive() // null class loader and incomplete anonymous klasses. |
330 || is_alive_closure->do_object_b(keep_alive_object()); | |
331 | |
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332 return alive; |
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333 } |
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334 |
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335 |
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336 ClassLoaderData::~ClassLoaderData() { |
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337 // Release C heap structures for all the classes. |
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338 classes_do(InstanceKlass::release_C_heap_structures); |
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339 |
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340 Metaspace *m = _metaspace; |
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341 if (m != NULL) { |
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342 _metaspace = NULL; |
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343 // release the metaspace |
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344 delete m; |
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345 // release the handles |
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346 if (_handles != NULL) { |
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347 JNIHandleBlock::release_block(_handles); |
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348 _handles = NULL; |
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349 } |
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350 } |
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351 |
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352 // Clear all the JNI handles for methods |
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353 // These aren't deallocated and are going to look like a leak, but that's |
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354 // needed because we can't really get rid of jmethodIDs because we don't |
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355 // know when native code is going to stop using them. The spec says that |
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356 // they're "invalid" but existing programs likely rely on their being |
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357 // NULL after class unloading. |
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358 if (_jmethod_ids != NULL) { |
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359 Method::clear_jmethod_ids(this); |
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360 } |
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361 // Delete lock |
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362 delete _metaspace_lock; |
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363 |
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364 // Delete free list |
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365 if (_deallocate_list != NULL) { |
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366 delete _deallocate_list; |
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367 } |
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368 } |
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369 |
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370 /** |
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371 * Returns true if this class loader data is for the extension class loader. |
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372 */ |
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373 bool ClassLoaderData::is_ext_class_loader_data() const { |
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374 return SystemDictionary::is_ext_class_loader(class_loader()); |
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375 } |
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376 |
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377 Metaspace* ClassLoaderData::metaspace_non_null() { |
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378 assert(!DumpSharedSpaces, "wrong metaspace!"); |
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379 // If the metaspace has not been allocated, create a new one. Might want |
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380 // to create smaller arena for Reflection class loaders also. |
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381 // The reason for the delayed allocation is because some class loaders are |
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382 // simply for delegating with no metadata of their own. |
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383 if (_metaspace == NULL) { |
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384 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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385 // Check again if metaspace has been allocated while we were getting this lock. |
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386 if (_metaspace != NULL) { |
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387 return _metaspace; |
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388 } |
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389 if (this == the_null_class_loader_data()) { |
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390 assert (class_loader() == NULL, "Must be"); |
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391 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType)); |
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392 } else if (is_anonymous()) { |
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393 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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394 tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name()); |
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395 } |
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396 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType)); |
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397 } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) { |
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398 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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399 tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name()); |
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400 } |
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401 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType)); |
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402 } else { |
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403 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType)); |
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404 } |
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405 } |
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406 return _metaspace; |
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407 } |
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408 |
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409 JNIHandleBlock* ClassLoaderData::handles() const { return _handles; } |
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410 void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; } |
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411 |
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412 jobject ClassLoaderData::add_handle(Handle h) { |
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413 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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414 if (handles() == NULL) { |
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415 set_handles(JNIHandleBlock::allocate_block()); |
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416 } |
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417 return handles()->allocate_handle(h()); |
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418 } |
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419 |
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420 // Add this metadata pointer to be freed when it's safe. This is only during |
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421 // class unloading because Handles might point to this metadata field. |
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422 void ClassLoaderData::add_to_deallocate_list(Metadata* m) { |
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423 // Metadata in shared region isn't deleted. |
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424 if (!m->is_shared()) { |
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425 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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426 if (_deallocate_list == NULL) { |
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427 _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true); |
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428 } |
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429 _deallocate_list->append_if_missing(m); |
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430 } |
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431 } |
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432 |
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433 // Deallocate free metadata on the free list. How useful the PermGen was! |
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434 void ClassLoaderData::free_deallocate_list() { |
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435 // Don't need lock, at safepoint |
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436 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
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437 if (_deallocate_list == NULL) { |
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438 return; |
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439 } |
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440 // Go backwards because this removes entries that are freed. |
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441 for (int i = _deallocate_list->length() - 1; i >= 0; i--) { |
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442 Metadata* m = _deallocate_list->at(i); |
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443 if (!m->on_stack()) { |
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444 _deallocate_list->remove_at(i); |
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445 // There are only three types of metadata that we deallocate directly. |
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446 // Cast them so they can be used by the template function. |
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447 if (m->is_method()) { |
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448 MetadataFactory::free_metadata(this, (Method*)m); |
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449 } else if (m->is_constantPool()) { |
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450 MetadataFactory::free_metadata(this, (ConstantPool*)m); |
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451 } else if (m->is_klass()) { |
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452 MetadataFactory::free_metadata(this, (InstanceKlass*)m); |
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453 } else { |
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454 ShouldNotReachHere(); |
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455 } |
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456 } |
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457 } |
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458 } |
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459 |
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460 // These anonymous class loaders are to contain classes used for JSR292 |
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461 ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) { |
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462 // Add a new class loader data to the graph. |
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463 return ClassLoaderDataGraph::add(loader, true, CHECK_NULL); |
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464 } |
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465 |
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466 const char* ClassLoaderData::loader_name() { |
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467 // Handles null class loader |
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468 return SystemDictionary::loader_name(class_loader()); |
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469 } |
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470 |
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471 #ifndef PRODUCT |
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472 // Define to dump klasses |
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473 #undef CLD_DUMP_KLASSES |
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474 |
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475 void ClassLoaderData::dump(outputStream * const out) { |
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476 ResourceMark rm; |
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477 out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {", |
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478 p2i(this), p2i((void *)class_loader()), |
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479 p2i(class_loader() != NULL ? class_loader()->klass() : NULL), loader_name()); |
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480 if (claimed()) out->print(" claimed "); |
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481 if (is_unloading()) out->print(" unloading "); |
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482 out->print(" handles " INTPTR_FORMAT, p2i(handles())); |
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483 out->cr(); |
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484 if (metaspace_or_null() != NULL) { |
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485 out->print_cr("metaspace: " INTPTR_FORMAT, p2i(metaspace_or_null())); |
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486 metaspace_or_null()->dump(out); |
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487 } else { |
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488 out->print_cr("metaspace: NULL"); |
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489 } |
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490 |
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491 #ifdef CLD_DUMP_KLASSES |
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492 if (Verbose) { |
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493 ResourceMark rm; |
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494 Klass* k = _klasses; |
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495 while (k != NULL) { |
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496 out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(), |
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497 k->has_modified_oops(), k->has_accumulated_modified_oops()); |
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498 assert(k != k->next_link(), "no loops!"); |
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499 k = k->next_link(); |
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500 } |
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501 } |
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502 #endif // CLD_DUMP_KLASSES |
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503 #undef CLD_DUMP_KLASSES |
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504 if (_jmethod_ids != NULL) { |
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505 Method::print_jmethod_ids(this, out); |
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506 } |
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507 out->print_cr("}"); |
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508 } |
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509 #endif // PRODUCT |
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510 |
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511 void ClassLoaderData::verify() { |
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512 oop cl = class_loader(); |
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513 |
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514 guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same"); |
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515 guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be"); |
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516 |
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517 // Verify the integrity of the allocated space. |
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518 if (metaspace_or_null() != NULL) { |
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519 metaspace_or_null()->verify(); |
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520 } |
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521 |
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522 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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523 guarantee(k->class_loader_data() == this, "Must be the same"); |
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524 k->verify(); |
8751
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525 assert(k != k->next_link(), "no loops!"); |
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526 } |
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527 } |
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528 |
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529 bool ClassLoaderData::contains_klass(Klass* klass) { |
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530 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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531 if (k == klass) return true; |
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|
532 } |
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533 return false; |
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parents:
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|
534 } |
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|
535 |
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|
536 |
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537 // GC root of class loader data created. |
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538 ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
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539 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
17999
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8047812: Ensure ClassLoaderDataGraph::classes_unloading_do only delivers klasses from CLDs with non-reclaimed class loader oops
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540 ClassLoaderData* ClassLoaderDataGraph::_saved_unloading = NULL; |
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541 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
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542 |
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8038212: Method::is_valid_method() check has performance regression impact for stackwalking
coleenp
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543 bool ClassLoaderDataGraph::_should_purge = false; |
7384f6a12fc1
8038212: Method::is_valid_method() check has performance regression impact for stackwalking
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|
544 |
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545 // Add a new class loader data node to the list. Assign the newly created |
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546 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
10181
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547 ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_anonymous, TRAPS) { |
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548 // We need to allocate all the oops for the ClassLoaderData before allocating the |
9d75bcd7c890
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549 // actual ClassLoaderData object. |
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550 ClassLoaderData::Dependencies dependencies(CHECK_NULL); |
7409 | 551 |
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552 No_Safepoint_Verifier no_safepoints; // we mustn't GC until we've installed the |
9d75bcd7c890
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553 // ClassLoaderData in the graph since the CLD |
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554 // contains unhandled oops |
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|
555 |
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mgerdin
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556 ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous, dependencies); |
9d75bcd7c890
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|
557 |
6725
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|
558 |
10181
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mgerdin
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559 if (!is_anonymous) { |
1cb4795305b9
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560 ClassLoaderData** cld_addr = java_lang_ClassLoader::loader_data_addr(loader()); |
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561 // First, Atomically set it |
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562 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
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563 if (old != NULL) { |
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564 delete cld; |
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565 // Returns the data. |
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|
566 return old; |
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|
567 } |
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|
568 } |
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|
569 |
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|
570 // We won the race, and therefore the task of adding the data to the list of |
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571 // class loader data |
10181
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572 ClassLoaderData** list_head = &_head; |
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573 ClassLoaderData* next = _head; |
1cb4795305b9
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|
574 |
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575 do { |
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coleenp
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|
576 cld->set_next(next); |
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577 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
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578 if (exchanged == next) { |
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|
579 if (TraceClassLoaderData) { |
7185
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|
580 ResourceMark rm; |
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changeset
|
581 tty->print("[ClassLoaderData: "); |
17937
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
17935
diff
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|
582 tty->print("create class loader data " INTPTR_FORMAT, p2i(cld)); |
78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
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|
583 tty->print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)cld->class_loader()), |
7185
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6725
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|
584 cld->loader_name()); |
6725
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coleenp
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diff
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|
585 tty->print_cr("]"); |
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coleenp
parents:
diff
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|
586 } |
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parents:
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|
587 return cld; |
da91efe96a93
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parents:
diff
changeset
|
588 } |
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parents:
diff
changeset
|
589 next = exchanged; |
da91efe96a93
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|
590 } while (true); |
7185
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parents:
6725
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changeset
|
591 |
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parents:
diff
changeset
|
592 } |
da91efe96a93
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diff
changeset
|
593 |
da91efe96a93
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coleenp
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diff
changeset
|
594 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
da91efe96a93
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coleenp
parents:
diff
changeset
|
595 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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coleenp
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diff
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|
596 cld->oops_do(f, klass_closure, must_claim); |
da91efe96a93
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parents:
diff
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|
597 } |
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|
598 } |
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coleenp
parents:
diff
changeset
|
599 |
7185
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|
600 void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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|
601 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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|
602 if (cld->keep_alive()) { |
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|
603 cld->oops_do(f, klass_closure, must_claim); |
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parents:
6725
diff
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|
604 } |
90273fc0a981
8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
coleenp
parents:
6725
diff
changeset
|
605 } |
90273fc0a981
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coleenp
parents:
6725
diff
changeset
|
606 } |
90273fc0a981
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coleenp
parents:
6725
diff
changeset
|
607 |
6725
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coleenp
parents:
diff
changeset
|
608 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
609 if (ClassUnloading) { |
20278
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
20260
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|
610 keep_alive_oops_do(f, klass_closure, must_claim); |
6725
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diff
changeset
|
611 } else { |
20278
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diff
changeset
|
612 oops_do(f, klass_closure, must_claim); |
2c6ef90f030a
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stefank
parents:
20260
diff
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|
613 } |
2c6ef90f030a
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stefank
parents:
20260
diff
changeset
|
614 } |
2c6ef90f030a
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20260
diff
changeset
|
615 |
2c6ef90f030a
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|
616 void ClassLoaderDataGraph::cld_do(CLDClosure* cl) { |
2c6ef90f030a
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diff
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617 for (ClassLoaderData* cld = _head; cl != NULL && cld != NULL; cld = cld->next()) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
618 cl->do_cld(cld); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
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diff
changeset
|
619 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
620 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
621 |
2c6ef90f030a
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diff
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|
622 void ClassLoaderDataGraph::roots_cld_do(CLDClosure* strong, CLDClosure* weak) { |
2c6ef90f030a
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|
623 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->_next) { |
2c6ef90f030a
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stefank
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diff
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|
624 CLDClosure* closure = cld->keep_alive() ? strong : weak; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
625 if (closure != NULL) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
626 closure->do_cld(cld); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20260
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changeset
|
627 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
628 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
629 } |
2c6ef90f030a
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stefank
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changeset
|
630 |
2c6ef90f030a
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|
631 void ClassLoaderDataGraph::keep_alive_cld_do(CLDClosure* cl) { |
2c6ef90f030a
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|
632 roots_cld_do(cl, NULL); |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
633 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
634 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
changeset
|
635 void ClassLoaderDataGraph::always_strong_cld_do(CLDClosure* cl) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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20260
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|
636 if (ClassUnloading) { |
2c6ef90f030a
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20260
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changeset
|
637 keep_alive_cld_do(cl); |
2c6ef90f030a
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diff
changeset
|
638 } else { |
2c6ef90f030a
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changeset
|
639 cld_do(cl); |
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|
640 } |
da91efe96a93
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changeset
|
641 } |
da91efe96a93
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|
642 |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
643 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
da91efe96a93
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diff
changeset
|
644 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
da91efe96a93
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coleenp
parents:
diff
changeset
|
645 cld->classes_do(klass_closure); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
diff
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|
646 } |
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647 } |
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648 |
10405 | 649 void ClassLoaderDataGraph::classes_do(void f(Klass* const)) { |
650 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { | |
651 cld->classes_do(f); | |
652 } | |
653 } | |
654 | |
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655 void ClassLoaderDataGraph::loaded_classes_do(KlassClosure* klass_closure) { |
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656 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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657 cld->loaded_classes_do(klass_closure); |
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658 } |
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659 } |
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660 |
10405 | 661 void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) { |
662 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
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663 // Only walk the head until any clds not purged from prior unloading |
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664 // (CMS doesn't purge right away). |
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665 for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) { |
10405 | 666 cld->classes_do(f); |
667 } | |
668 } | |
669 | |
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670 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
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671 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
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672 |
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673 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
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674 |
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675 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
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676 ClassLoaderData* curr = _head; |
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677 while (curr != _saved_head) { |
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678 if (!curr->claimed()) { |
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679 array->push(curr); |
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680 |
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681 if (TraceClassLoaderData) { |
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682 tty->print("[ClassLoaderData] found new CLD: "); |
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683 curr->print_value_on(tty); |
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684 tty->cr(); |
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685 } |
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686 } |
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687 |
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688 curr = curr->_next; |
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689 } |
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690 |
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691 return array; |
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692 } |
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693 |
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694 bool ClassLoaderDataGraph::unload_list_contains(const void* x) { |
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695 assert(SafepointSynchronize::is_at_safepoint(), "only safe to call at safepoint"); |
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696 for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) { |
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697 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
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698 return true; |
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699 } |
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700 } |
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701 return false; |
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702 } |
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703 |
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704 #ifndef PRODUCT |
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705 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
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706 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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707 if (loader_data == data) { |
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708 return true; |
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709 } |
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710 } |
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711 |
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712 return false; |
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713 } |
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714 #endif // PRODUCT |
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715 |
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716 |
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717 // Move class loader data from main list to the unloaded list for unloading |
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718 // and deallocation later. |
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719 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure, bool clean_alive) { |
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720 ClassLoaderData* data = _head; |
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721 ClassLoaderData* prev = NULL; |
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722 bool seen_dead_loader = false; |
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723 |
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724 // Save previous _unloading pointer for CMS which may add to unloading list before |
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725 // purging and we don't want to rewalk the previously unloaded class loader data. |
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726 _saved_unloading = _unloading; |
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727 |
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728 while (data != NULL) { |
20260 | 729 if (data->is_alive(is_alive_closure)) { |
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730 prev = data; |
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731 data = data->next(); |
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732 continue; |
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|
733 } |
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734 seen_dead_loader = true; |
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735 ClassLoaderData* dead = data; |
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736 dead->unload(); |
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737 data = data->next(); |
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|
738 // Remove from loader list. |
10183
868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
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10181
diff
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|
739 // This class loader data will no longer be found |
868d87ed63c8
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
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10181
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|
740 // in the ClassLoaderDataGraph. |
6725
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741 if (prev != NULL) { |
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|
742 prev->set_next(data); |
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|
743 } else { |
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|
744 assert(dead == _head, "sanity check"); |
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|
745 _head = data; |
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|
746 } |
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|
747 dead->set_next(_unloading); |
da91efe96a93
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|
748 _unloading = dead; |
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|
749 } |
10405 | 750 |
20619
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751 if (clean_alive) { |
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752 // Clean previous versions and the deallocate list. |
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753 ClassLoaderDataGraph::clean_metaspaces(); |
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754 } |
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|
755 |
10405 | 756 if (seen_dead_loader) { |
757 post_class_unload_events(); | |
758 } | |
759 | |
6725
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|
760 return seen_dead_loader; |
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|
761 } |
da91efe96a93
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|
762 |
20619
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763 void ClassLoaderDataGraph::clean_metaspaces() { |
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764 // mark metadata seen on the stack and code cache so we can delete unneeded entries. |
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765 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
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|
766 MetadataOnStackMark md_on_stack(has_redefined_a_class); |
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|
767 |
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|
768 if (has_redefined_a_class) { |
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769 // purge_previous_versions also cleans weak method links. Because |
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|
770 // one method's MDO can reference another method from another |
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771 // class loader, we need to first clean weak method links for all |
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772 // class loaders here. Below, we can then free redefined methods |
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|
773 // for all class loaders. |
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|
774 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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|
775 data->classes_do(InstanceKlass::purge_previous_versions); |
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|
776 } |
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|
777 } |
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|
778 |
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|
779 // Need to purge the previous version before deallocating. |
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|
780 free_deallocate_lists(); |
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|
781 } |
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|
782 |
6725
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|
783 void ClassLoaderDataGraph::purge() { |
17935
7384f6a12fc1
8038212: Method::is_valid_method() check has performance regression impact for stackwalking
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17674
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|
784 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); |
6725
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|
785 ClassLoaderData* list = _unloading; |
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|
786 _unloading = NULL; |
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787 ClassLoaderData* next = list; |
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788 while (next != NULL) { |
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789 ClassLoaderData* purge_me = next; |
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790 next = purge_me->next(); |
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791 delete purge_me; |
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792 } |
10175 | 793 Metaspace::purge(); |
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794 } |
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795 |
10405 | 796 void ClassLoaderDataGraph::post_class_unload_events(void) { |
797 #if INCLUDE_TRACE | |
798 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
799 if (Tracing::enabled()) { | |
800 if (Tracing::is_event_enabled(TraceClassUnloadEvent)) { | |
801 assert(_unloading != NULL, "need class loader data unload list!"); | |
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802 _class_unload_time = Ticks::now(); |
10405 | 803 classes_unloading_do(&class_unload_event); |
804 } | |
805 Tracing::on_unloading_classes(); | |
806 } | |
807 #endif | |
808 } | |
809 | |
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810 void ClassLoaderDataGraph::free_deallocate_lists() { |
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811 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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812 // We need to keep this data until InstanceKlass::purge_previous_version has been |
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813 // called on all alive classes. See the comment in ClassLoaderDataGraph::clean_metaspaces. |
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814 cld->free_deallocate_list(); |
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815 } |
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816 } |
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817 |
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818 // CDS support |
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819 |
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820 // Global metaspaces for writing information to the shared archive. When |
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821 // application CDS is supported, we may need one per metaspace, so this |
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822 // sort of looks like it. |
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823 Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
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824 Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
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825 static bool _shared_metaspaces_initialized = false; |
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826 |
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827 // Initialize shared metaspaces (change to call from somewhere not lazily) |
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828 void ClassLoaderData::initialize_shared_metaspaces() { |
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829 assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
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830 assert(this == ClassLoaderData::the_null_class_loader_data(), |
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831 "only supported for null loader data for now"); |
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832 assert (!_shared_metaspaces_initialized, "only initialize once"); |
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833 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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834 _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType); |
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835 _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType); |
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836 _shared_metaspaces_initialized = true; |
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837 } |
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838 |
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839 Metaspace* ClassLoaderData::ro_metaspace() { |
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840 assert(_ro_metaspace != NULL, "should already be initialized"); |
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841 return _ro_metaspace; |
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842 } |
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843 |
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844 Metaspace* ClassLoaderData::rw_metaspace() { |
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845 assert(_rw_metaspace != NULL, "should already be initialized"); |
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846 return _rw_metaspace; |
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847 } |
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848 |
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849 ClassLoaderDataGraphKlassIteratorAtomic::ClassLoaderDataGraphKlassIteratorAtomic() |
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850 : _next_klass(NULL) { |
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851 ClassLoaderData* cld = ClassLoaderDataGraph::_head; |
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852 Klass* klass = NULL; |
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853 |
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854 // Find the first klass in the CLDG. |
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855 while (cld != NULL) { |
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856 klass = cld->_klasses; |
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857 if (klass != NULL) { |
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858 _next_klass = klass; |
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859 return; |
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860 } |
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861 cld = cld->next(); |
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862 } |
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863 } |
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864 |
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865 Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass_in_cldg(Klass* klass) { |
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866 Klass* next = klass->next_link(); |
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867 if (next != NULL) { |
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868 return next; |
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869 } |
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870 |
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871 // No more klasses in the current CLD. Time to find a new CLD. |
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872 ClassLoaderData* cld = klass->class_loader_data(); |
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873 while (next == NULL) { |
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874 cld = cld->next(); |
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875 if (cld == NULL) { |
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876 break; |
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877 } |
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878 next = cld->_klasses; |
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879 } |
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880 |
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881 return next; |
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882 } |
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883 |
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884 Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass() { |
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885 Klass* head = _next_klass; |
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886 |
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887 while (head != NULL) { |
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888 Klass* next = next_klass_in_cldg(head); |
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889 |
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890 Klass* old_head = (Klass*)Atomic::cmpxchg_ptr(next, &_next_klass, head); |
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891 |
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892 if (old_head == head) { |
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893 return head; // Won the CAS. |
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894 } |
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895 |
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896 head = old_head; |
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897 } |
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898 |
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899 // Nothing more for the iterator to hand out. |
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900 assert(head == NULL, err_msg("head is " PTR_FORMAT ", expected not null:", p2i(head))); |
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901 return NULL; |
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902 } |
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903 |
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904 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
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905 _data = ClassLoaderDataGraph::_head; |
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906 } |
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907 |
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908 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
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909 |
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910 #ifndef PRODUCT |
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911 // callable from debugger |
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912 extern "C" int print_loader_data_graph() { |
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913 ClassLoaderDataGraph::dump_on(tty); |
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914 return 0; |
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915 } |
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916 |
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917 void ClassLoaderDataGraph::verify() { |
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918 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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919 data->verify(); |
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920 } |
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921 } |
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922 |
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923 void ClassLoaderDataGraph::dump_on(outputStream * const out) { |
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924 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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925 data->dump(out); |
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926 } |
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927 MetaspaceAux::dump(out); |
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928 } |
7956 | 929 #endif // PRODUCT |
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930 |
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931 void ClassLoaderData::print_value_on(outputStream* out) const { |
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932 if (class_loader() == NULL) { |
7956 | 933 out->print("NULL class_loader"); |
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934 } else { |
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935 out->print("class loader " INTPTR_FORMAT, p2i(this)); |
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936 class_loader()->print_value_on(out); |
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937 } |
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938 } |
10405 | 939 |
940 #if INCLUDE_TRACE | |
941 | |
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942 Ticks ClassLoaderDataGraph::_class_unload_time; |
10405 | 943 |
944 void ClassLoaderDataGraph::class_unload_event(Klass* const k) { | |
945 | |
946 // post class unload event | |
947 EventClassUnload event(UNTIMED); | |
948 event.set_endtime(_class_unload_time); | |
949 event.set_unloadedClass(k); | |
950 oop defining_class_loader = k->class_loader(); | |
951 event.set_definingClassLoader(defining_class_loader != NULL ? | |
952 defining_class_loader->klass() : (Klass*)NULL); | |
953 event.commit(); | |
954 } | |
955 | |
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956 #endif // INCLUDE_TRACE |