Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/classLoaderData.cpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
author | stefank |
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date | Mon, 07 Jul 2014 10:12:40 +0200 |
parents | 556a06aec3fa |
children | b12a2a9b05ca |
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" |
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67 |
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69 #include "trace/tracing.hpp" | |
70 #endif | |
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()), |
20260 | 76 _is_anonymous(is_anonymous), |
77 // An anonymous class loader data doesn't have anything to keep | |
78 // it from being unloaded during parsing of the anonymous class. | |
79 // The null-class-loader should always be kept alive. | |
80 _keep_alive(is_anonymous || h_class_loader.is_null()), | |
7409 | 81 _metaspace(NULL), _unloading(false), _klasses(NULL), |
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82 _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL), |
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83 _next(NULL), _dependencies(dependencies), |
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84 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) { |
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85 // empty |
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86 } |
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87 |
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88 void ClassLoaderData::init_dependencies(TRAPS) { |
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89 assert(!Universe::is_fully_initialized(), "should only be called when initializing"); |
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90 assert(is_the_null_class_loader_data(), "should only call this for the null class loader"); |
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91 _dependencies.init(CHECK); |
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92 } |
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93 |
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94 void ClassLoaderData::Dependencies::init(TRAPS) { |
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95 // Create empty dependencies array to add to. CMS requires this to be |
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96 // an oop so that it can track additions via card marks. We think. |
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97 _list_head = oopFactory::new_objectArray(2, CHECK); |
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98 } |
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99 |
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100 bool ClassLoaderData::claim() { |
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101 if (_claimed == 1) { |
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102 return false; |
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103 } |
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104 |
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105 return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0; |
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106 } |
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107 |
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108 void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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109 if (must_claim && !claim()) { |
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110 return; |
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111 } |
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112 |
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113 f->do_oop(&_class_loader); |
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114 _dependencies.oops_do(f); |
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115 _handles->oops_do(f); |
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116 if (klass_closure != NULL) { |
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117 classes_do(klass_closure); |
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118 } |
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119 } |
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120 |
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121 void ClassLoaderData::Dependencies::oops_do(OopClosure* f) { |
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122 f->do_oop((oop*)&_list_head); |
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123 } |
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124 |
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125 void ClassLoaderData::classes_do(KlassClosure* klass_closure) { |
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126 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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127 klass_closure->do_klass(k); |
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128 assert(k != k->next_link(), "no loops!"); |
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129 } |
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130 } |
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131 |
10405 | 132 void ClassLoaderData::classes_do(void f(Klass * const)) { |
133 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { | |
134 f(k); | |
135 } | |
136 } | |
137 | |
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138 void ClassLoaderData::loaded_classes_do(KlassClosure* klass_closure) { |
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139 // Lock to avoid classes being modified/added/removed during iteration |
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140 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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141 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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142 // Do not filter ArrayKlass oops here... |
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143 if (k->oop_is_array() || (k->oop_is_instance() && InstanceKlass::cast(k)->is_loaded())) { |
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144 klass_closure->do_klass(k); |
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145 } |
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146 } |
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147 } |
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148 |
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149 void ClassLoaderData::classes_do(void f(InstanceKlass*)) { |
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150 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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151 if (k->oop_is_instance()) { |
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152 f(InstanceKlass::cast(k)); |
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153 } |
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154 assert(k != k->next_link(), "no loops!"); |
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155 } |
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156 } |
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157 |
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158 void ClassLoaderData::record_dependency(Klass* k, TRAPS) { |
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159 ClassLoaderData * const from_cld = this; |
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160 ClassLoaderData * const to_cld = k->class_loader_data(); |
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161 |
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162 // Dependency to the null class loader data doesn't need to be recorded |
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163 // because the null class loader data never goes away. |
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164 if (to_cld->is_the_null_class_loader_data()) { |
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165 return; |
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166 } |
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167 |
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168 oop to; |
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169 if (to_cld->is_anonymous()) { |
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170 // Anonymous class dependencies are through the mirror. |
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171 to = k->java_mirror(); |
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172 } else { |
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173 to = to_cld->class_loader(); |
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174 |
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175 // If from_cld is anonymous, even if it's class_loader is a parent of 'to' |
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176 // we still have to add it. The class_loader won't keep from_cld alive. |
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177 if (!from_cld->is_anonymous()) { |
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178 // Check that this dependency isn't from the same or parent class_loader |
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179 oop from = from_cld->class_loader(); |
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180 |
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181 oop curr = from; |
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182 while (curr != NULL) { |
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183 if (curr == to) { |
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184 return; // this class loader is in the parent list, no need to add it. |
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185 } |
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186 curr = java_lang_ClassLoader::parent(curr); |
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187 } |
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188 } |
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189 } |
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190 |
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191 // It's a dependency we won't find through GC, add it. This is relatively rare |
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192 // Must handle over GC point. |
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193 Handle dependency(THREAD, to); |
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194 from_cld->_dependencies.add(dependency, CHECK); |
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195 } |
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196 |
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197 |
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198 void ClassLoaderData::Dependencies::add(Handle dependency, TRAPS) { |
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199 // Check first if this dependency is already in the list. |
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200 // Save a pointer to the last to add to under the lock. |
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201 objArrayOop ok = _list_head; |
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202 objArrayOop last = NULL; |
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203 while (ok != NULL) { |
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204 last = ok; |
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205 if (ok->obj_at(0) == dependency()) { |
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206 // Don't need to add it |
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207 return; |
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208 } |
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209 ok = (objArrayOop)ok->obj_at(1); |
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210 } |
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211 |
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212 // Must handle over GC points |
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213 assert (last != NULL, "dependencies should be initialized"); |
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214 objArrayHandle last_handle(THREAD, last); |
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215 |
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216 // Create a new dependency node with fields for (class_loader or mirror, next) |
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217 objArrayOop deps = oopFactory::new_objectArray(2, CHECK); |
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218 deps->obj_at_put(0, dependency()); |
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219 |
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220 // Must handle over GC points |
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221 objArrayHandle new_dependency(THREAD, deps); |
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222 |
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223 // Add the dependency under lock |
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224 locked_add(last_handle, new_dependency, THREAD); |
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225 } |
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226 |
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227 void ClassLoaderData::Dependencies::locked_add(objArrayHandle last_handle, |
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228 objArrayHandle new_dependency, |
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229 Thread* THREAD) { |
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230 |
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231 // Have to lock and put the new dependency on the end of the dependency |
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232 // array so the card mark for CMS sees that this dependency is new. |
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233 // Can probably do this lock free with some effort. |
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234 ObjectLocker ol(Handle(THREAD, _list_head), THREAD); |
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235 |
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236 oop loader_or_mirror = new_dependency->obj_at(0); |
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237 |
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238 // Since the dependencies are only added, add to the end. |
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239 objArrayOop end = last_handle(); |
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240 objArrayOop last = NULL; |
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241 while (end != NULL) { |
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242 last = end; |
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243 // check again if another thread added it to the end. |
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244 if (end->obj_at(0) == loader_or_mirror) { |
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245 // Don't need to add it |
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246 return; |
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247 } |
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248 end = (objArrayOop)end->obj_at(1); |
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249 } |
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250 assert (last != NULL, "dependencies should be initialized"); |
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251 // fill in the first element with the oop in new_dependency. |
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252 if (last->obj_at(0) == NULL) { |
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253 last->obj_at_put(0, new_dependency->obj_at(0)); |
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254 } else { |
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255 last->obj_at_put(1, new_dependency()); |
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256 } |
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257 } |
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258 |
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259 void ClassLoaderDataGraph::clear_claimed_marks() { |
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260 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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261 cld->clear_claimed(); |
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262 } |
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263 } |
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264 |
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265 void ClassLoaderData::add_class(Klass* k) { |
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266 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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267 Klass* old_value = _klasses; |
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268 k->set_next_link(old_value); |
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269 // link the new item into the list |
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270 _klasses = k; |
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271 |
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272 if (TraceClassLoaderData && Verbose && k->class_loader_data() != NULL) { |
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273 ResourceMark rm; |
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274 tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: " |
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275 PTR_FORMAT " loader: " PTR_FORMAT " %s", |
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276 p2i(k), |
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277 k->external_name(), |
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278 p2i(k->class_loader_data()), |
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279 p2i((void *)k->class_loader()), |
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280 loader_name()); |
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281 } |
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282 } |
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283 |
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284 // This is called by InstanceKlass::deallocate_contents() to remove the |
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285 // scratch_class for redefine classes. We need a lock because there it may not |
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286 // be called at a safepoint if there's an error. |
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287 void ClassLoaderData::remove_class(Klass* scratch_class) { |
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288 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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289 Klass* prev = NULL; |
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290 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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291 if (k == scratch_class) { |
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292 if (prev == NULL) { |
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293 _klasses = k->next_link(); |
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294 } else { |
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295 Klass* next = k->next_link(); |
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296 prev->set_next_link(next); |
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297 } |
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298 return; |
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299 } |
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300 prev = k; |
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301 assert(k != k->next_link(), "no loops!"); |
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302 } |
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303 ShouldNotReachHere(); // should have found this class!! |
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304 } |
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305 |
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306 void ClassLoaderData::unload() { |
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307 _unloading = true; |
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308 |
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309 // Tell serviceability tools these classes are unloading |
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310 classes_do(InstanceKlass::notify_unload_class); |
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311 |
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312 if (TraceClassLoaderData) { |
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313 ResourceMark rm; |
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314 tty->print("[ClassLoaderData: unload loader data " INTPTR_FORMAT, p2i(this)); |
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315 tty->print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)class_loader()), |
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316 loader_name()); |
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317 if (is_anonymous()) { |
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318 tty->print(" for anonymous class " INTPTR_FORMAT " ", p2i(_klasses)); |
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319 } |
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320 tty->print_cr("]"); |
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321 } |
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322 } |
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323 |
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324 #ifdef ASSERT |
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325 class AllAliveClosure : public OopClosure { |
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326 BoolObjectClosure* _is_alive_closure; |
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327 bool _found_dead; |
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328 public: |
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329 AllAliveClosure(BoolObjectClosure* is_alive_closure) : _is_alive_closure(is_alive_closure), _found_dead(false) {} |
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330 template <typename T> void do_oop_work(T* p) { |
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331 T heap_oop = oopDesc::load_heap_oop(p); |
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332 if (!oopDesc::is_null(heap_oop)) { |
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333 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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334 if (!_is_alive_closure->do_object_b(obj)) { |
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335 _found_dead = true; |
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336 } |
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337 } |
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338 } |
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339 void do_oop(oop* p) { do_oop_work<oop>(p); } |
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340 void do_oop(narrowOop* p) { do_oop_work<narrowOop>(p); } |
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341 bool found_dead() { return _found_dead; } |
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342 }; |
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343 #endif |
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344 |
20260 | 345 oop ClassLoaderData::keep_alive_object() const { |
346 assert(!keep_alive(), "Don't use with CLDs that are artificially kept alive"); | |
347 return is_anonymous() ? _klasses->java_mirror() : class_loader(); | |
348 } | |
349 | |
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350 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { |
20260 | 351 bool alive = keep_alive() // null class loader and incomplete anonymous klasses. |
352 || is_alive_closure->do_object_b(keep_alive_object()); | |
353 | |
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354 #ifdef ASSERT |
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355 if (alive) { |
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356 AllAliveClosure all_alive_closure(is_alive_closure); |
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357 KlassToOopClosure klass_closure(&all_alive_closure); |
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358 const_cast<ClassLoaderData*>(this)->oops_do(&all_alive_closure, &klass_closure, false); |
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359 assert(!all_alive_closure.found_dead(), err_msg("Found dead oop in alive cld: " PTR_FORMAT, p2i(this))); |
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360 } |
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361 #endif |
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362 |
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363 return alive; |
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364 } |
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365 |
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366 |
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367 ClassLoaderData::~ClassLoaderData() { |
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368 // Release C heap structures for all the classes. |
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369 classes_do(InstanceKlass::release_C_heap_structures); |
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370 |
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371 Metaspace *m = _metaspace; |
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372 if (m != NULL) { |
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373 _metaspace = NULL; |
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374 // release the metaspace |
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375 delete m; |
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376 // release the handles |
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377 if (_handles != NULL) { |
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378 JNIHandleBlock::release_block(_handles); |
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379 _handles = NULL; |
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380 } |
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381 } |
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382 |
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383 // Clear all the JNI handles for methods |
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384 // These aren't deallocated and are going to look like a leak, but that's |
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385 // needed because we can't really get rid of jmethodIDs because we don't |
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386 // know when native code is going to stop using them. The spec says that |
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387 // they're "invalid" but existing programs likely rely on their being |
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388 // NULL after class unloading. |
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389 if (_jmethod_ids != NULL) { |
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390 Method::clear_jmethod_ids(this); |
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391 } |
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392 // Delete lock |
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393 delete _metaspace_lock; |
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394 |
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395 // Delete free list |
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396 if (_deallocate_list != NULL) { |
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397 delete _deallocate_list; |
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398 } |
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399 } |
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400 |
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401 /** |
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402 * Returns true if this class loader data is for the extension class loader. |
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403 */ |
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404 bool ClassLoaderData::is_ext_class_loader_data() const { |
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405 return SystemDictionary::is_ext_class_loader(class_loader()); |
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406 } |
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407 |
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408 Metaspace* ClassLoaderData::metaspace_non_null() { |
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409 assert(!DumpSharedSpaces, "wrong metaspace!"); |
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410 // If the metaspace has not been allocated, create a new one. Might want |
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411 // to create smaller arena for Reflection class loaders also. |
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412 // The reason for the delayed allocation is because some class loaders are |
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413 // simply for delegating with no metadata of their own. |
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414 if (_metaspace == NULL) { |
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415 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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416 // Check again if metaspace has been allocated while we were getting this lock. |
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417 if (_metaspace != NULL) { |
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418 return _metaspace; |
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419 } |
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420 if (this == the_null_class_loader_data()) { |
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421 assert (class_loader() == NULL, "Must be"); |
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422 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType)); |
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423 } else if (is_anonymous()) { |
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424 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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425 tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name()); |
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426 } |
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427 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType)); |
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428 } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) { |
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429 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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430 tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name()); |
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431 } |
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432 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType)); |
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433 } else { |
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434 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType)); |
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435 } |
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436 } |
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437 return _metaspace; |
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438 } |
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439 |
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440 JNIHandleBlock* ClassLoaderData::handles() const { return _handles; } |
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441 void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; } |
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442 |
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443 jobject ClassLoaderData::add_handle(Handle h) { |
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444 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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445 if (handles() == NULL) { |
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446 set_handles(JNIHandleBlock::allocate_block()); |
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447 } |
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448 return handles()->allocate_handle(h()); |
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449 } |
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450 |
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451 // Add this metadata pointer to be freed when it's safe. This is only during |
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452 // class unloading because Handles might point to this metadata field. |
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453 void ClassLoaderData::add_to_deallocate_list(Metadata* m) { |
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454 // Metadata in shared region isn't deleted. |
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455 if (!m->is_shared()) { |
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456 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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457 if (_deallocate_list == NULL) { |
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458 _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true); |
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459 } |
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460 _deallocate_list->append_if_missing(m); |
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461 } |
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462 } |
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463 |
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464 // Deallocate free metadata on the free list. How useful the PermGen was! |
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465 void ClassLoaderData::free_deallocate_list() { |
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466 // Don't need lock, at safepoint |
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467 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
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468 if (_deallocate_list == NULL) { |
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469 return; |
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470 } |
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471 // Go backwards because this removes entries that are freed. |
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472 for (int i = _deallocate_list->length() - 1; i >= 0; i--) { |
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473 Metadata* m = _deallocate_list->at(i); |
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474 if (!m->on_stack()) { |
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475 _deallocate_list->remove_at(i); |
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476 // There are only three types of metadata that we deallocate directly. |
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477 // Cast them so they can be used by the template function. |
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478 if (m->is_method()) { |
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479 MetadataFactory::free_metadata(this, (Method*)m); |
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480 } else if (m->is_constantPool()) { |
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481 MetadataFactory::free_metadata(this, (ConstantPool*)m); |
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482 } else if (m->is_klass()) { |
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483 MetadataFactory::free_metadata(this, (InstanceKlass*)m); |
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484 } else { |
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485 ShouldNotReachHere(); |
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486 } |
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487 } |
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488 } |
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489 } |
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490 |
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491 // These anonymous class loaders are to contain classes used for JSR292 |
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492 ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) { |
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493 // Add a new class loader data to the graph. |
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494 return ClassLoaderDataGraph::add(loader, true, CHECK_NULL); |
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495 } |
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496 |
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497 const char* ClassLoaderData::loader_name() { |
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498 // Handles null class loader |
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499 return SystemDictionary::loader_name(class_loader()); |
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500 } |
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501 |
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502 #ifndef PRODUCT |
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503 // Define to dump klasses |
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504 #undef CLD_DUMP_KLASSES |
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505 |
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506 void ClassLoaderData::dump(outputStream * const out) { |
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507 ResourceMark rm; |
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508 out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {", |
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509 p2i(this), p2i((void *)class_loader()), |
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510 p2i(class_loader() != NULL ? class_loader()->klass() : NULL), loader_name()); |
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511 if (claimed()) out->print(" claimed "); |
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512 if (is_unloading()) out->print(" unloading "); |
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513 out->print(" handles " INTPTR_FORMAT, p2i(handles())); |
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514 out->cr(); |
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515 if (metaspace_or_null() != NULL) { |
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516 out->print_cr("metaspace: " INTPTR_FORMAT, p2i(metaspace_or_null())); |
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517 metaspace_or_null()->dump(out); |
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518 } else { |
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519 out->print_cr("metaspace: NULL"); |
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520 } |
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521 |
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522 #ifdef CLD_DUMP_KLASSES |
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523 if (Verbose) { |
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524 ResourceMark rm; |
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525 Klass* k = _klasses; |
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526 while (k != NULL) { |
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527 out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(), |
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528 k->has_modified_oops(), k->has_accumulated_modified_oops()); |
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529 assert(k != k->next_link(), "no loops!"); |
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530 k = k->next_link(); |
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531 } |
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532 } |
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533 #endif // CLD_DUMP_KLASSES |
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534 #undef CLD_DUMP_KLASSES |
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535 if (_jmethod_ids != NULL) { |
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536 Method::print_jmethod_ids(this, out); |
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537 } |
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538 out->print_cr("}"); |
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539 } |
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540 #endif // PRODUCT |
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541 |
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542 void ClassLoaderData::verify() { |
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543 oop cl = class_loader(); |
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544 |
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545 guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same"); |
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546 guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be"); |
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547 |
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548 // Verify the integrity of the allocated space. |
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549 if (metaspace_or_null() != NULL) { |
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550 metaspace_or_null()->verify(); |
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551 } |
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552 |
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553 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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554 guarantee(k->class_loader_data() == this, "Must be the same"); |
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555 k->verify(); |
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556 assert(k != k->next_link(), "no loops!"); |
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557 } |
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558 } |
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559 |
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560 bool ClassLoaderData::contains_klass(Klass* klass) { |
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561 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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562 if (k == klass) return true; |
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563 } |
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564 return false; |
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565 } |
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566 |
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567 |
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568 // GC root of class loader data created. |
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569 ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
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570 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
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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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571 ClassLoaderData* ClassLoaderDataGraph::_saved_unloading = NULL; |
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572 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
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573 |
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574 bool ClassLoaderDataGraph::_should_purge = false; |
7384f6a12fc1
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575 |
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576 // Add a new class loader data node to the list. Assign the newly created |
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577 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
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578 ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_anonymous, TRAPS) { |
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579 // We need to allocate all the oops for the ClassLoaderData before allocating the |
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580 // actual ClassLoaderData object. |
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581 ClassLoaderData::Dependencies dependencies(CHECK_NULL); |
7409 | 582 |
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583 No_Safepoint_Verifier no_safepoints; // we mustn't GC until we've installed the |
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584 // ClassLoaderData in the graph since the CLD |
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585 // contains unhandled oops |
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586 |
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587 ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous, dependencies); |
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588 |
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589 |
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590 if (!is_anonymous) { |
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591 ClassLoaderData** cld_addr = java_lang_ClassLoader::loader_data_addr(loader()); |
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592 // First, Atomically set it |
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593 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
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594 if (old != NULL) { |
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595 delete cld; |
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596 // Returns the data. |
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597 return old; |
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598 } |
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599 } |
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600 |
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601 // We won the race, and therefore the task of adding the data to the list of |
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602 // class loader data |
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603 ClassLoaderData** list_head = &_head; |
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604 ClassLoaderData* next = _head; |
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|
605 |
6725
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606 do { |
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607 cld->set_next(next); |
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608 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
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609 if (exchanged == next) { |
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610 if (TraceClassLoaderData) { |
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611 ResourceMark rm; |
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612 tty->print("[ClassLoaderData: "); |
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613 tty->print("create class loader data " INTPTR_FORMAT, p2i(cld)); |
78bbf4d43a14
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614 tty->print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)cld->class_loader()), |
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615 cld->loader_name()); |
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616 tty->print_cr("]"); |
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617 } |
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618 return cld; |
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619 } |
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620 next = exchanged; |
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621 } while (true); |
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622 |
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623 } |
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624 |
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625 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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626 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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627 cld->oops_do(f, klass_closure, must_claim); |
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628 } |
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629 } |
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630 |
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631 void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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632 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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633 if (cld->keep_alive()) { |
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634 cld->oops_do(f, klass_closure, must_claim); |
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635 } |
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636 } |
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637 } |
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|
638 |
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639 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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640 if (ClassUnloading) { |
20278
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641 keep_alive_oops_do(f, klass_closure, must_claim); |
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642 } else { |
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643 oops_do(f, klass_closure, must_claim); |
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|
644 } |
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645 } |
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646 |
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647 void ClassLoaderDataGraph::cld_do(CLDClosure* cl) { |
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648 for (ClassLoaderData* cld = _head; cl != NULL && cld != NULL; cld = cld->next()) { |
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649 cl->do_cld(cld); |
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650 } |
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651 } |
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652 |
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653 void ClassLoaderDataGraph::roots_cld_do(CLDClosure* strong, CLDClosure* weak) { |
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654 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->_next) { |
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655 CLDClosure* closure = cld->keep_alive() ? strong : weak; |
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656 if (closure != NULL) { |
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657 closure->do_cld(cld); |
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658 } |
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659 } |
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660 } |
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661 |
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662 void ClassLoaderDataGraph::keep_alive_cld_do(CLDClosure* cl) { |
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663 roots_cld_do(cl, NULL); |
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664 } |
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665 |
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666 void ClassLoaderDataGraph::always_strong_cld_do(CLDClosure* cl) { |
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667 if (ClassUnloading) { |
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668 keep_alive_cld_do(cl); |
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669 } else { |
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670 cld_do(cl); |
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671 } |
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672 } |
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673 |
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674 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
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675 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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676 cld->classes_do(klass_closure); |
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677 } |
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678 } |
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679 |
10405 | 680 void ClassLoaderDataGraph::classes_do(void f(Klass* const)) { |
681 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { | |
682 cld->classes_do(f); | |
683 } | |
684 } | |
685 | |
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686 void ClassLoaderDataGraph::loaded_classes_do(KlassClosure* klass_closure) { |
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687 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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688 cld->loaded_classes_do(klass_closure); |
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689 } |
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690 } |
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691 |
10405 | 692 void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) { |
693 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
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694 // Only walk the head until any clds not purged from prior unloading |
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695 // (CMS doesn't purge right away). |
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696 for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) { |
10405 | 697 cld->classes_do(f); |
698 } | |
699 } | |
700 | |
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701 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
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702 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
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703 |
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704 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
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705 |
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706 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
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707 ClassLoaderData* curr = _head; |
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708 while (curr != _saved_head) { |
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709 if (!curr->claimed()) { |
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710 array->push(curr); |
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|
711 |
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712 if (TraceClassLoaderData) { |
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713 tty->print("[ClassLoaderData] found new CLD: "); |
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714 curr->print_value_on(tty); |
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715 tty->cr(); |
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|
716 } |
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|
717 } |
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|
718 |
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|
719 curr = curr->_next; |
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|
720 } |
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|
721 |
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722 return array; |
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|
723 } |
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|
724 |
20278
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725 bool ClassLoaderDataGraph::unload_list_contains(const void* x) { |
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726 assert(SafepointSynchronize::is_at_safepoint(), "only safe to call at safepoint"); |
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727 for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) { |
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728 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
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729 return true; |
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|
730 } |
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|
731 } |
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|
732 return false; |
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|
733 } |
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|
734 |
17663
40353abd7984
8029178: Parallel class loading test anonymous-simple gets SIGSEGV in Metaspace::contains
coleenp
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13400
diff
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|
735 #ifndef PRODUCT |
6725
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736 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
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737 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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738 if (loader_data == data) { |
da91efe96a93
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|
739 return true; |
da91efe96a93
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|
740 } |
da91efe96a93
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|
741 } |
da91efe96a93
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|
742 |
da91efe96a93
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|
743 return false; |
da91efe96a93
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|
744 } |
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|
745 #endif // PRODUCT |
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|
746 |
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747 |
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748 // Move class loader data from main list to the unloaded list for unloading |
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|
749 // and deallocation later. |
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750 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure) { |
6725
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751 ClassLoaderData* data = _head; |
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752 ClassLoaderData* prev = NULL; |
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|
753 bool seen_dead_loader = false; |
17999
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8047812: Ensure ClassLoaderDataGraph::classes_unloading_do only delivers klasses from CLDs with non-reclaimed class loader oops
mgronlun
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changeset
|
754 |
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|
755 // Save previous _unloading pointer for CMS which may add to unloading list before |
e4a6e7f1b90b
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|
756 // purging and we don't want to rewalk the previously unloaded class loader data. |
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|
757 _saved_unloading = _unloading; |
e4a6e7f1b90b
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|
758 |
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759 // mark metadata seen on the stack and code cache so we can delete |
da91efe96a93
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|
760 // unneeded entries. |
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|
761 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
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|
762 MetadataOnStackMark md_on_stack; |
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763 while (data != NULL) { |
20260 | 764 if (data->is_alive(is_alive_closure)) { |
6725
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|
765 if (has_redefined_a_class) { |
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|
766 data->classes_do(InstanceKlass::purge_previous_versions); |
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|
767 } |
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|
768 data->free_deallocate_list(); |
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|
769 prev = data; |
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|
770 data = data->next(); |
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|
771 continue; |
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|
772 } |
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773 seen_dead_loader = true; |
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|
774 ClassLoaderData* dead = data; |
7185
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|
775 dead->unload(); |
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|
776 data = data->next(); |
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|
777 // Remove from loader list. |
10183
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jmasa
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10181
diff
changeset
|
778 // This class loader data will no longer be found |
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10181
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|
779 // in the ClassLoaderDataGraph. |
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780 if (prev != NULL) { |
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|
781 prev->set_next(data); |
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782 } else { |
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coleenp
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|
783 assert(dead == _head, "sanity check"); |
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784 _head = data; |
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785 } |
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786 dead->set_next(_unloading); |
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787 _unloading = dead; |
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788 } |
10405 | 789 |
790 if (seen_dead_loader) { | |
791 post_class_unload_events(); | |
792 } | |
793 | |
6725
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794 return seen_dead_loader; |
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|
795 } |
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796 |
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797 void ClassLoaderDataGraph::purge() { |
17935
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798 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); |
6725
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799 ClassLoaderData* list = _unloading; |
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800 _unloading = NULL; |
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801 ClassLoaderData* next = list; |
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802 while (next != NULL) { |
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803 ClassLoaderData* purge_me = next; |
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804 next = purge_me->next(); |
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805 delete purge_me; |
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806 } |
10175 | 807 Metaspace::purge(); |
6725
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808 } |
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809 |
10405 | 810 void ClassLoaderDataGraph::post_class_unload_events(void) { |
811 #if INCLUDE_TRACE | |
812 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
813 if (Tracing::enabled()) { | |
814 if (Tracing::is_event_enabled(TraceClassUnloadEvent)) { | |
815 assert(_unloading != NULL, "need class loader data unload list!"); | |
13400
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816 _class_unload_time = Ticks::now(); |
10405 | 817 classes_unloading_do(&class_unload_event); |
818 } | |
819 Tracing::on_unloading_classes(); | |
820 } | |
821 #endif | |
822 } | |
823 | |
6725
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824 // CDS support |
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825 |
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826 // Global metaspaces for writing information to the shared archive. When |
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827 // application CDS is supported, we may need one per metaspace, so this |
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828 // sort of looks like it. |
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829 Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
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830 Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
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831 static bool _shared_metaspaces_initialized = false; |
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832 |
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833 // Initialize shared metaspaces (change to call from somewhere not lazily) |
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834 void ClassLoaderData::initialize_shared_metaspaces() { |
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835 assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
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836 assert(this == ClassLoaderData::the_null_class_loader_data(), |
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837 "only supported for null loader data for now"); |
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838 assert (!_shared_metaspaces_initialized, "only initialize once"); |
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839 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
7446
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8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
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840 _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType); |
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841 _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType); |
6725
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842 _shared_metaspaces_initialized = true; |
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843 } |
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|
844 |
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845 Metaspace* ClassLoaderData::ro_metaspace() { |
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846 assert(_ro_metaspace != NULL, "should already be initialized"); |
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847 return _ro_metaspace; |
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|
848 } |
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|
849 |
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|
850 Metaspace* ClassLoaderData::rw_metaspace() { |
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851 assert(_rw_metaspace != NULL, "should already be initialized"); |
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852 return _rw_metaspace; |
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|
853 } |
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|
854 |
20278
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855 ClassLoaderDataGraphKlassIteratorAtomic::ClassLoaderDataGraphKlassIteratorAtomic() |
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856 : _next_klass(NULL) { |
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857 ClassLoaderData* cld = ClassLoaderDataGraph::_head; |
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858 Klass* klass = NULL; |
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859 |
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|
860 // Find the first klass in the CLDG. |
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|
861 while (cld != NULL) { |
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|
862 klass = cld->_klasses; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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863 if (klass != NULL) { |
2c6ef90f030a
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|
864 _next_klass = klass; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
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diff
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|
865 return; |
2c6ef90f030a
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parents:
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|
866 } |
2c6ef90f030a
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diff
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|
867 cld = cld->next(); |
2c6ef90f030a
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|
868 } |
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|
869 } |
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|
870 |
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871 Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass_in_cldg(Klass* klass) { |
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872 Klass* next = klass->next_link(); |
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873 if (next != NULL) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
874 return next; |
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8049421: G1 Class Unloading after completing a concurrent mark cycle
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diff
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|
875 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
876 |
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diff
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|
877 // No more klasses in the current CLD. Time to find a new CLD. |
2c6ef90f030a
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878 ClassLoaderData* cld = klass->class_loader_data(); |
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8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
879 while (next == NULL) { |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
880 cld = cld->next(); |
2c6ef90f030a
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|
881 if (cld == NULL) { |
2c6ef90f030a
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|
882 break; |
2c6ef90f030a
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diff
changeset
|
883 } |
2c6ef90f030a
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|
884 next = cld->_klasses; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
885 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
886 |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
887 return next; |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
888 } |
2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
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|
889 |
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890 Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass() { |
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891 Klass* head = (Klass*)_next_klass; |
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|
892 |
2c6ef90f030a
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|
893 while (head != NULL) { |
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|
894 Klass* next = next_klass_in_cldg(head); |
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895 |
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896 Klass* old_head = (Klass*)Atomic::cmpxchg_ptr(next, &_next_klass, head); |
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897 |
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898 if (old_head == head) { |
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|
899 return head; // Won the CAS. |
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|
900 } |
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|
901 |
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902 head = old_head; |
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|
903 } |
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|
904 |
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905 // Nothing more for the iterator to hand out. |
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906 assert(head == NULL, err_msg("head is " PTR_FORMAT ", expected not null:", p2i(head))); |
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907 return NULL; |
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908 } |
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909 |
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910 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
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911 _data = ClassLoaderDataGraph::_head; |
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912 } |
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913 |
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914 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
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915 |
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916 #ifndef PRODUCT |
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917 // callable from debugger |
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918 extern "C" int print_loader_data_graph() { |
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919 ClassLoaderDataGraph::dump_on(tty); |
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920 return 0; |
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921 } |
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922 |
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923 void ClassLoaderDataGraph::verify() { |
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924 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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925 data->verify(); |
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926 } |
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|
927 } |
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|
928 |
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929 void ClassLoaderDataGraph::dump_on(outputStream * const out) { |
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930 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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931 data->dump(out); |
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932 } |
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933 MetaspaceAux::dump(out); |
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934 } |
7956 | 935 #endif // PRODUCT |
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936 |
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937 void ClassLoaderData::print_value_on(outputStream* out) const { |
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938 if (class_loader() == NULL) { |
7956 | 939 out->print("NULL class_loader"); |
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940 } else { |
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941 out->print("class loader " INTPTR_FORMAT, p2i(this)); |
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942 class_loader()->print_value_on(out); |
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943 } |
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944 } |
10405 | 945 |
946 #if INCLUDE_TRACE | |
947 | |
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948 Ticks ClassLoaderDataGraph::_class_unload_time; |
10405 | 949 |
950 void ClassLoaderDataGraph::class_unload_event(Klass* const k) { | |
951 | |
952 // post class unload event | |
953 EventClassUnload event(UNTIMED); | |
954 event.set_endtime(_class_unload_time); | |
955 event.set_unloadedClass(k); | |
956 oop defining_class_loader = k->class_loader(); | |
957 event.set_definingClassLoader(defining_class_loader != NULL ? | |
958 defining_class_loader->klass() : (Klass*)NULL); | |
959 event.commit(); | |
960 } | |
961 | |
962 #endif /* INCLUDE_TRACE */ |