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annotate src/share/vm/classfile/classLoaderData.cpp @ 11722:ff05c78a7f64
use time passed to decide what methods to compile or inline
author | Christian Wirth <christian.wirth@oracle.com> |
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date | Thu, 19 Sep 2013 10:36:56 +0200 |
parents | f2110083203d |
children | 190899198332 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 // 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/ostream.hpp" |
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66 |
10405 | 67 #if INCLUDE_TRACE |
68 #include "trace/tracing.hpp" | |
69 #endif | |
70 | |
71 | |
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72 ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL; |
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73 |
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74 ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies) : |
7409 | 75 _class_loader(h_class_loader()), |
76 _is_anonymous(is_anonymous), _keep_alive(is_anonymous), // initially | |
77 _metaspace(NULL), _unloading(false), _klasses(NULL), | |
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78 _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL), |
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79 _next(NULL), _dependencies(dependencies), |
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80 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) { |
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81 // empty |
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82 } |
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83 |
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84 void ClassLoaderData::init_dependencies(TRAPS) { |
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85 assert(!Universe::is_fully_initialized(), "should only be called when initializing"); |
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86 assert(is_the_null_class_loader_data(), "should only call this for the null class loader"); |
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87 _dependencies.init(CHECK); |
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88 } |
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89 |
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90 void ClassLoaderData::Dependencies::init(TRAPS) { |
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91 // Create empty dependencies array to add to. CMS requires this to be |
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92 // an oop so that it can track additions via card marks. We think. |
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93 _list_head = oopFactory::new_objectArray(2, CHECK); |
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94 } |
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95 |
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96 bool ClassLoaderData::claim() { |
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97 if (_claimed == 1) { |
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98 return false; |
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99 } |
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100 |
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101 return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0; |
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102 } |
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103 |
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104 void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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105 if (must_claim && !claim()) { |
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106 return; |
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107 } |
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108 |
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109 f->do_oop(&_class_loader); |
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110 _dependencies.oops_do(f); |
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111 _handles->oops_do(f); |
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112 if (klass_closure != NULL) { |
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113 classes_do(klass_closure); |
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114 } |
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115 } |
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116 |
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117 void ClassLoaderData::Dependencies::oops_do(OopClosure* f) { |
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118 f->do_oop((oop*)&_list_head); |
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119 } |
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120 |
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121 void ClassLoaderData::classes_do(KlassClosure* klass_closure) { |
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122 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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123 klass_closure->do_klass(k); |
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124 assert(k != k->next_link(), "no loops!"); |
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125 } |
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126 } |
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127 |
10405 | 128 void ClassLoaderData::classes_do(void f(Klass * const)) { |
129 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { | |
130 f(k); | |
131 } | |
132 } | |
133 | |
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134 void ClassLoaderData::classes_do(void f(InstanceKlass*)) { |
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135 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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136 if (k->oop_is_instance()) { |
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137 f(InstanceKlass::cast(k)); |
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138 } |
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139 assert(k != k->next_link(), "no loops!"); |
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140 } |
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141 } |
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142 |
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143 void ClassLoaderData::record_dependency(Klass* k, TRAPS) { |
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144 ClassLoaderData * const from_cld = this; |
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145 ClassLoaderData * const to_cld = k->class_loader_data(); |
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146 |
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147 // Dependency to the null class loader data doesn't need to be recorded |
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148 // because the null class loader data never goes away. |
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149 if (to_cld->is_the_null_class_loader_data()) { |
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150 return; |
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151 } |
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152 |
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153 oop to; |
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154 if (to_cld->is_anonymous()) { |
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155 // Anonymous class dependencies are through the mirror. |
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156 to = k->java_mirror(); |
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157 } else { |
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158 to = to_cld->class_loader(); |
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159 |
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160 // If from_cld is anonymous, even if it's class_loader is a parent of 'to' |
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161 // we still have to add it. The class_loader won't keep from_cld alive. |
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162 if (!from_cld->is_anonymous()) { |
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163 // Check that this dependency isn't from the same or parent class_loader |
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164 oop from = from_cld->class_loader(); |
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165 |
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166 oop curr = from; |
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167 while (curr != NULL) { |
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168 if (curr == to) { |
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169 return; // this class loader is in the parent list, no need to add it. |
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170 } |
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171 curr = java_lang_ClassLoader::parent(curr); |
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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 // It's a dependency we won't find through GC, add it. This is relatively rare |
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177 // Must handle over GC point. |
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178 Handle dependency(THREAD, to); |
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179 from_cld->_dependencies.add(dependency, CHECK); |
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180 } |
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181 |
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182 |
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183 void ClassLoaderData::Dependencies::add(Handle dependency, TRAPS) { |
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184 // Check first if this dependency is already in the list. |
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185 // Save a pointer to the last to add to under the lock. |
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186 objArrayOop ok = _list_head; |
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187 objArrayOop last = NULL; |
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188 while (ok != NULL) { |
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189 last = ok; |
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190 if (ok->obj_at(0) == dependency()) { |
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191 // Don't need to add it |
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192 return; |
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193 } |
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194 ok = (objArrayOop)ok->obj_at(1); |
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195 } |
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196 |
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197 // Must handle over GC points |
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198 assert (last != NULL, "dependencies should be initialized"); |
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199 objArrayHandle last_handle(THREAD, last); |
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200 |
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201 // Create a new dependency node with fields for (class_loader or mirror, next) |
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202 objArrayOop deps = oopFactory::new_objectArray(2, CHECK); |
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203 deps->obj_at_put(0, dependency()); |
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204 |
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205 // Must handle over GC points |
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206 objArrayHandle new_dependency(THREAD, deps); |
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207 |
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208 // Add the dependency under lock |
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209 locked_add(last_handle, new_dependency, THREAD); |
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210 } |
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211 |
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212 void ClassLoaderData::Dependencies::locked_add(objArrayHandle last_handle, |
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213 objArrayHandle new_dependency, |
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214 Thread* THREAD) { |
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215 |
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216 // Have to lock and put the new dependency on the end of the dependency |
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217 // array so the card mark for CMS sees that this dependency is new. |
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218 // Can probably do this lock free with some effort. |
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219 ObjectLocker ol(Handle(THREAD, _list_head), THREAD); |
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220 |
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221 oop loader_or_mirror = new_dependency->obj_at(0); |
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222 |
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223 // Since the dependencies are only added, add to the end. |
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224 objArrayOop end = last_handle(); |
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225 objArrayOop last = NULL; |
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226 while (end != NULL) { |
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227 last = end; |
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228 // check again if another thread added it to the end. |
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229 if (end->obj_at(0) == loader_or_mirror) { |
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230 // Don't need to add it |
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231 return; |
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232 } |
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233 end = (objArrayOop)end->obj_at(1); |
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234 } |
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235 assert (last != NULL, "dependencies should be initialized"); |
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236 // fill in the first element with the oop in new_dependency. |
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237 if (last->obj_at(0) == NULL) { |
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238 last->obj_at_put(0, new_dependency->obj_at(0)); |
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239 } else { |
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240 last->obj_at_put(1, new_dependency()); |
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241 } |
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242 } |
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243 |
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244 void ClassLoaderDataGraph::clear_claimed_marks() { |
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245 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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246 cld->clear_claimed(); |
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247 } |
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248 } |
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249 |
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250 void ClassLoaderData::add_class(Klass* k) { |
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251 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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252 Klass* old_value = _klasses; |
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253 k->set_next_link(old_value); |
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254 // link the new item into the list |
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255 _klasses = k; |
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256 |
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257 if (TraceClassLoaderData && Verbose && k->class_loader_data() != NULL) { |
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258 ResourceMark rm; |
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259 tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: " |
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260 PTR_FORMAT " loader: " PTR_FORMAT " %s", |
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261 k, |
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262 k->external_name(), |
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263 k->class_loader_data(), |
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264 k->class_loader(), |
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265 loader_name()); |
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266 } |
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267 } |
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268 |
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269 // This is called by InstanceKlass::deallocate_contents() to remove the |
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270 // scratch_class for redefine classes. We need a lock because there it may not |
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271 // be called at a safepoint if there's an error. |
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272 void ClassLoaderData::remove_class(Klass* scratch_class) { |
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273 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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274 Klass* prev = NULL; |
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275 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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276 if (k == scratch_class) { |
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277 if (prev == NULL) { |
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278 _klasses = k->next_link(); |
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279 } else { |
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280 Klass* next = k->next_link(); |
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281 prev->set_next_link(next); |
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282 } |
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283 return; |
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284 } |
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285 prev = k; |
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286 assert(k != k->next_link(), "no loops!"); |
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287 } |
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288 ShouldNotReachHere(); // should have found this class!! |
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289 } |
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290 |
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291 void ClassLoaderData::unload() { |
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292 _unloading = true; |
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293 |
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294 // Tell serviceability tools these classes are unloading |
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295 classes_do(InstanceKlass::notify_unload_class); |
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296 |
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297 if (TraceClassLoaderData) { |
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298 ResourceMark rm; |
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299 tty->print("[ClassLoaderData: unload loader data "PTR_FORMAT, this); |
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300 tty->print(" for instance "PTR_FORMAT" of %s", class_loader(), |
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301 loader_name()); |
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302 if (is_anonymous()) { |
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303 tty->print(" for anonymous class "PTR_FORMAT " ", _klasses); |
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304 } |
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305 tty->print_cr("]"); |
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306 } |
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307 } |
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308 |
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309 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { |
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310 bool alive = |
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311 is_anonymous() ? |
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312 is_alive_closure->do_object_b(_klasses->java_mirror()) : |
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313 class_loader() == NULL || is_alive_closure->do_object_b(class_loader()); |
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314 assert(!alive || claimed(), "must be claimed"); |
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315 return alive; |
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316 } |
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317 |
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318 |
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319 ClassLoaderData::~ClassLoaderData() { |
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320 // Release C heap structures for all the classes. |
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321 classes_do(InstanceKlass::release_C_heap_structures); |
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322 |
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323 Metaspace *m = _metaspace; |
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324 if (m != NULL) { |
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325 _metaspace = NULL; |
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326 // release the metaspace |
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327 delete m; |
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328 // release the handles |
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329 if (_handles != NULL) { |
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330 JNIHandleBlock::release_block(_handles); |
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331 _handles = NULL; |
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332 } |
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333 } |
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334 |
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335 // Clear all the JNI handles for methods |
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336 // These aren't deallocated and are going to look like a leak, but that's |
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337 // needed because we can't really get rid of jmethodIDs because we don't |
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338 // know when native code is going to stop using them. The spec says that |
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339 // they're "invalid" but existing programs likely rely on their being |
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340 // NULL after class unloading. |
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341 if (_jmethod_ids != NULL) { |
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342 Method::clear_jmethod_ids(this); |
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343 } |
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344 // Delete lock |
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345 delete _metaspace_lock; |
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346 |
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347 // Delete free list |
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348 if (_deallocate_list != NULL) { |
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349 delete _deallocate_list; |
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350 } |
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351 } |
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352 |
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353 /** |
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354 * Returns true if this class loader data is for the extension class loader. |
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355 */ |
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356 bool ClassLoaderData::is_ext_class_loader_data() const { |
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357 return SystemDictionary::is_ext_class_loader(class_loader()); |
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358 } |
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359 |
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360 Metaspace* ClassLoaderData::metaspace_non_null() { |
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361 assert(!DumpSharedSpaces, "wrong metaspace!"); |
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362 // If the metaspace has not been allocated, create a new one. Might want |
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363 // to create smaller arena for Reflection class loaders also. |
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364 // The reason for the delayed allocation is because some class loaders are |
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365 // simply for delegating with no metadata of their own. |
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366 if (_metaspace == NULL) { |
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367 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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368 // Check again if metaspace has been allocated while we were getting this lock. |
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369 if (_metaspace != NULL) { |
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370 return _metaspace; |
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371 } |
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372 if (this == the_null_class_loader_data()) { |
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373 assert (class_loader() == NULL, "Must be"); |
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374 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType)); |
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375 } else if (is_anonymous()) { |
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376 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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377 tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name()); |
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378 } |
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379 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType)); |
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380 } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) { |
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381 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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382 tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name()); |
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383 } |
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384 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType)); |
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385 } else { |
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386 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType)); |
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387 } |
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388 } |
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389 return _metaspace; |
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390 } |
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391 |
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392 JNIHandleBlock* ClassLoaderData::handles() const { return _handles; } |
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393 void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; } |
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394 |
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395 jobject ClassLoaderData::add_handle(Handle h) { |
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396 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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397 if (handles() == NULL) { |
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398 set_handles(JNIHandleBlock::allocate_block()); |
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399 } |
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400 return handles()->allocate_handle(h()); |
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401 } |
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402 |
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403 // Add this metadata pointer to be freed when it's safe. This is only during |
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404 // class unloading because Handles might point to this metadata field. |
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405 void ClassLoaderData::add_to_deallocate_list(Metadata* m) { |
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406 // Metadata in shared region isn't deleted. |
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407 if (!m->is_shared()) { |
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408 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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409 if (_deallocate_list == NULL) { |
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410 _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true); |
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411 } |
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412 _deallocate_list->append_if_missing(m); |
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413 } |
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414 } |
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415 |
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416 // Deallocate free metadata on the free list. How useful the PermGen was! |
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417 void ClassLoaderData::free_deallocate_list() { |
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418 // Don't need lock, at safepoint |
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419 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
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420 if (_deallocate_list == NULL) { |
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421 return; |
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422 } |
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423 // Go backwards because this removes entries that are freed. |
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424 for (int i = _deallocate_list->length() - 1; i >= 0; i--) { |
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425 Metadata* m = _deallocate_list->at(i); |
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426 if (!m->on_stack()) { |
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427 _deallocate_list->remove_at(i); |
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428 // There are only three types of metadata that we deallocate directly. |
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429 // Cast them so they can be used by the template function. |
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430 if (m->is_method()) { |
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431 MetadataFactory::free_metadata(this, (Method*)m); |
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432 } else if (m->is_constantPool()) { |
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433 MetadataFactory::free_metadata(this, (ConstantPool*)m); |
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434 } else if (m->is_klass()) { |
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435 MetadataFactory::free_metadata(this, (InstanceKlass*)m); |
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436 } else { |
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437 ShouldNotReachHere(); |
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438 } |
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439 } |
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440 } |
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441 } |
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442 |
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443 // These anonymous class loaders are to contain classes used for JSR292 |
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444 ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) { |
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445 // Add a new class loader data to the graph. |
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446 return ClassLoaderDataGraph::add(loader, true, CHECK_NULL); |
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447 } |
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448 |
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449 const char* ClassLoaderData::loader_name() { |
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450 // Handles null class loader |
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451 return SystemDictionary::loader_name(class_loader()); |
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452 } |
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453 |
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454 #ifndef PRODUCT |
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455 // Define to dump klasses |
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456 #undef CLD_DUMP_KLASSES |
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457 |
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458 void ClassLoaderData::dump(outputStream * const out) { |
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459 ResourceMark rm; |
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460 out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {", |
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461 this, class_loader(), |
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462 class_loader() != NULL ? class_loader()->klass() : NULL, loader_name()); |
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463 if (claimed()) out->print(" claimed "); |
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464 if (is_unloading()) out->print(" unloading "); |
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465 out->print(" handles " INTPTR_FORMAT, handles()); |
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466 out->cr(); |
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467 if (metaspace_or_null() != NULL) { |
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468 out->print_cr("metaspace: " PTR_FORMAT, metaspace_or_null()); |
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469 metaspace_or_null()->dump(out); |
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470 } else { |
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471 out->print_cr("metaspace: NULL"); |
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472 } |
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473 |
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474 #ifdef CLD_DUMP_KLASSES |
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475 if (Verbose) { |
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476 ResourceMark rm; |
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477 Klass* k = _klasses; |
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478 while (k != NULL) { |
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479 out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(), |
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480 k->has_modified_oops(), k->has_accumulated_modified_oops()); |
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481 assert(k != k->next_link(), "no loops!"); |
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482 k = k->next_link(); |
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483 } |
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484 } |
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485 #endif // CLD_DUMP_KLASSES |
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486 #undef CLD_DUMP_KLASSES |
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487 if (_jmethod_ids != NULL) { |
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488 Method::print_jmethod_ids(this, out); |
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489 } |
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490 out->print_cr("}"); |
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491 } |
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492 #endif // PRODUCT |
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493 |
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494 void ClassLoaderData::verify() { |
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495 oop cl = class_loader(); |
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496 |
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497 guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same"); |
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498 guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be"); |
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499 |
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500 // Verify the integrity of the allocated space. |
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501 if (metaspace_or_null() != NULL) { |
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502 metaspace_or_null()->verify(); |
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503 } |
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504 |
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505 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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506 guarantee(k->class_loader_data() == this, "Must be the same"); |
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507 k->verify(); |
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508 assert(k != k->next_link(), "no loops!"); |
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509 } |
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510 } |
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511 |
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512 |
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513 // GC root of class loader data created. |
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514 ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
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515 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
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516 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
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517 |
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518 // Add a new class loader data node to the list. Assign the newly created |
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519 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
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520 ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_anonymous, TRAPS) { |
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521 // We need to allocate all the oops for the ClassLoaderData before allocating the |
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522 // actual ClassLoaderData object. |
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523 ClassLoaderData::Dependencies dependencies(CHECK_NULL); |
7409 | 524 |
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525 No_Safepoint_Verifier no_safepoints; // we mustn't GC until we've installed the |
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526 // ClassLoaderData in the graph since the CLD |
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527 // contains unhandled oops |
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528 |
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529 ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous, dependencies); |
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530 |
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531 |
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532 if (!is_anonymous) { |
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533 ClassLoaderData** cld_addr = java_lang_ClassLoader::loader_data_addr(loader()); |
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534 // First, Atomically set it |
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535 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
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536 if (old != NULL) { |
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537 delete cld; |
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538 // Returns the data. |
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539 return old; |
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540 } |
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541 } |
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542 |
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543 // We won the race, and therefore the task of adding the data to the list of |
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544 // class loader data |
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545 ClassLoaderData** list_head = &_head; |
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546 ClassLoaderData* next = _head; |
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547 |
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548 do { |
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549 cld->set_next(next); |
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550 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
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551 if (exchanged == next) { |
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552 if (TraceClassLoaderData) { |
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553 ResourceMark rm; |
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554 tty->print("[ClassLoaderData: "); |
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555 tty->print("create class loader data "PTR_FORMAT, cld); |
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556 tty->print(" for instance "PTR_FORMAT" of %s", cld->class_loader(), |
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557 cld->loader_name()); |
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558 tty->print_cr("]"); |
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559 } |
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560 return cld; |
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561 } |
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562 next = exchanged; |
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563 } while (true); |
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564 |
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565 } |
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566 |
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567 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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568 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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569 cld->oops_do(f, klass_closure, must_claim); |
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570 } |
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571 } |
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572 |
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573 void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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574 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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575 if (cld->keep_alive()) { |
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576 cld->oops_do(f, klass_closure, must_claim); |
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577 } |
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578 } |
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579 } |
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580 |
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581 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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582 if (ClassUnloading) { |
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583 ClassLoaderData::the_null_class_loader_data()->oops_do(f, klass_closure, must_claim); |
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584 // keep any special CLDs alive. |
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585 ClassLoaderDataGraph::keep_alive_oops_do(f, klass_closure, must_claim); |
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586 } else { |
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587 ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim); |
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588 } |
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589 } |
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590 |
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591 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
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592 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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593 cld->classes_do(klass_closure); |
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594 } |
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595 } |
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596 |
10405 | 597 void ClassLoaderDataGraph::classes_do(void f(Klass* const)) { |
598 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { | |
599 cld->classes_do(f); | |
600 } | |
601 } | |
602 | |
603 void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) { | |
604 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
605 for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) { | |
606 cld->classes_do(f); | |
607 } | |
608 } | |
609 | |
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610 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
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611 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
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612 |
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613 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
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614 |
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615 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
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616 ClassLoaderData* curr = _head; |
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617 while (curr != _saved_head) { |
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618 if (!curr->claimed()) { |
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619 array->push(curr); |
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620 |
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621 if (TraceClassLoaderData) { |
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622 tty->print("[ClassLoaderData] found new CLD: "); |
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623 curr->print_value_on(tty); |
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624 tty->cr(); |
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625 } |
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626 } |
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627 |
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628 curr = curr->_next; |
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629 } |
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630 |
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631 return array; |
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632 } |
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633 |
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634 #ifndef PRODUCT |
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635 // for debugging and hsfind(x) |
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636 bool ClassLoaderDataGraph::contains(address x) { |
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637 // I think we need the _metaspace_lock taken here because the class loader |
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638 // data graph could be changing while we are walking it (new entries added, |
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639 // new entries being unloaded, etc). |
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640 if (DumpSharedSpaces) { |
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641 // There are only two metaspaces to worry about. |
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642 ClassLoaderData* ncld = ClassLoaderData::the_null_class_loader_data(); |
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643 return (ncld->ro_metaspace()->contains(x) || ncld->rw_metaspace()->contains(x)); |
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644 } |
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645 |
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646 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(x)) { |
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647 return true; |
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648 } |
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649 |
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650 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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651 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
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652 return true; |
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653 } |
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654 } |
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655 |
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656 // Could also be on an unloading list which is okay, ie. still allocated |
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657 // for a little while. |
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658 for (ClassLoaderData* ucld = _unloading; ucld != NULL; ucld = ucld->next()) { |
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659 if (ucld->metaspace_or_null() != NULL && ucld->metaspace_or_null()->contains(x)) { |
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660 return true; |
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661 } |
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662 } |
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663 return false; |
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664 } |
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665 |
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666 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
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667 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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668 if (loader_data == data) { |
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669 return true; |
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670 } |
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671 } |
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672 |
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673 return false; |
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674 } |
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675 #endif // PRODUCT |
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676 |
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677 |
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678 // Move class loader data from main list to the unloaded list for unloading |
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679 // and deallocation later. |
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680 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure) { |
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681 ClassLoaderData* data = _head; |
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682 ClassLoaderData* prev = NULL; |
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683 bool seen_dead_loader = false; |
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684 // mark metadata seen on the stack and code cache so we can delete |
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685 // unneeded entries. |
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686 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
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687 MetadataOnStackMark md_on_stack; |
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688 while (data != NULL) { |
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689 if (data->keep_alive() || data->is_alive(is_alive_closure)) { |
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690 if (has_redefined_a_class) { |
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691 data->classes_do(InstanceKlass::purge_previous_versions); |
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692 } |
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693 data->free_deallocate_list(); |
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694 prev = data; |
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695 data = data->next(); |
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696 continue; |
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697 } |
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698 seen_dead_loader = true; |
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699 ClassLoaderData* dead = data; |
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700 dead->unload(); |
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701 data = data->next(); |
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702 // Remove from loader list. |
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703 // This class loader data will no longer be found |
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704 // in the ClassLoaderDataGraph. |
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705 if (prev != NULL) { |
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706 prev->set_next(data); |
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707 } else { |
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708 assert(dead == _head, "sanity check"); |
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709 _head = data; |
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710 } |
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711 dead->set_next(_unloading); |
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712 _unloading = dead; |
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713 } |
10405 | 714 |
715 if (seen_dead_loader) { | |
716 post_class_unload_events(); | |
717 } | |
718 | |
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719 return seen_dead_loader; |
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720 } |
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721 |
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722 void ClassLoaderDataGraph::purge() { |
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723 ClassLoaderData* list = _unloading; |
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724 _unloading = NULL; |
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725 ClassLoaderData* next = list; |
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726 while (next != NULL) { |
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727 ClassLoaderData* purge_me = next; |
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728 next = purge_me->next(); |
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729 delete purge_me; |
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730 } |
10175 | 731 Metaspace::purge(); |
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732 } |
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733 |
10405 | 734 void ClassLoaderDataGraph::post_class_unload_events(void) { |
735 #if INCLUDE_TRACE | |
736 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
737 if (Tracing::enabled()) { | |
738 if (Tracing::is_event_enabled(TraceClassUnloadEvent)) { | |
739 assert(_unloading != NULL, "need class loader data unload list!"); | |
740 _class_unload_time = Tracing::time(); | |
741 classes_unloading_do(&class_unload_event); | |
742 } | |
743 Tracing::on_unloading_classes(); | |
744 } | |
745 #endif | |
746 } | |
747 | |
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748 // CDS support |
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749 |
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750 // Global metaspaces for writing information to the shared archive. When |
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751 // application CDS is supported, we may need one per metaspace, so this |
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752 // sort of looks like it. |
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753 Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
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754 Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
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755 static bool _shared_metaspaces_initialized = false; |
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756 |
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757 // Initialize shared metaspaces (change to call from somewhere not lazily) |
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758 void ClassLoaderData::initialize_shared_metaspaces() { |
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759 assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
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760 assert(this == ClassLoaderData::the_null_class_loader_data(), |
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761 "only supported for null loader data for now"); |
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762 assert (!_shared_metaspaces_initialized, "only initialize once"); |
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763 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
7446
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diff
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764 _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType); |
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765 _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType); |
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766 _shared_metaspaces_initialized = true; |
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767 } |
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768 |
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769 Metaspace* ClassLoaderData::ro_metaspace() { |
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770 assert(_ro_metaspace != NULL, "should already be initialized"); |
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771 return _ro_metaspace; |
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772 } |
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773 |
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774 Metaspace* ClassLoaderData::rw_metaspace() { |
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775 assert(_rw_metaspace != NULL, "should already be initialized"); |
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776 return _rw_metaspace; |
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777 } |
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778 |
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779 |
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780 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
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781 _data = ClassLoaderDataGraph::_head; |
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782 } |
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|
783 |
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784 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
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785 |
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786 #ifndef PRODUCT |
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787 // callable from debugger |
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788 extern "C" int print_loader_data_graph() { |
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789 ClassLoaderDataGraph::dump_on(tty); |
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790 return 0; |
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|
791 } |
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|
792 |
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793 void ClassLoaderDataGraph::verify() { |
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794 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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795 data->verify(); |
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|
796 } |
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|
797 } |
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|
798 |
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799 void ClassLoaderDataGraph::dump_on(outputStream * const out) { |
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800 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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801 data->dump(out); |
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802 } |
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803 MetaspaceAux::dump(out); |
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804 } |
7956 | 805 #endif // PRODUCT |
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806 |
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807 void ClassLoaderData::print_value_on(outputStream* out) const { |
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808 if (class_loader() == NULL) { |
7956 | 809 out->print("NULL class_loader"); |
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810 } else { |
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811 out->print("class loader "PTR_FORMAT, this); |
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812 class_loader()->print_value_on(out); |
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813 } |
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814 } |
10405 | 815 |
816 #if INCLUDE_TRACE | |
817 | |
818 TracingTime ClassLoaderDataGraph::_class_unload_time; | |
819 | |
820 void ClassLoaderDataGraph::class_unload_event(Klass* const k) { | |
821 | |
822 // post class unload event | |
823 EventClassUnload event(UNTIMED); | |
824 event.set_endtime(_class_unload_time); | |
825 event.set_unloadedClass(k); | |
826 oop defining_class_loader = k->class_loader(); | |
827 event.set_definingClassLoader(defining_class_loader != NULL ? | |
828 defining_class_loader->klass() : (Klass*)NULL); | |
829 event.commit(); | |
830 } | |
831 | |
832 #endif /* INCLUDE_TRACE */ |