Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/classLoaderData.cpp @ 14484:3cdda110bbb5
8035412: Cleanup ClassLoaderData::is_alive
Reviewed-by: coleenp, mgerdin
author | stefank |
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date | Fri, 21 Feb 2014 10:19:09 +0100 |
parents | ce86c36b8921 |
children | f460c6926af7 |
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/macros.hpp" |
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66 #include "utilities/ostream.hpp" |
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67 |
10405 | 68 #if INCLUDE_TRACE |
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()), |
14484 | 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 k, |
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277 k->external_name(), |
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278 k->class_loader_data(), |
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279 (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 "PTR_FORMAT, this); |
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315 tty->print(" for instance "PTR_FORMAT" of %s", (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 "PTR_FORMAT " ", _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 |
14484 | 324 oop ClassLoaderData::keep_alive_object() const { |
325 assert(!keep_alive(), "Don't use with CLDs that are artificially kept alive"); | |
326 return is_anonymous() ? _klasses->java_mirror() : class_loader(); | |
327 } | |
328 | |
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329 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { |
14484 | 330 bool alive = keep_alive() // null class loader and incomplete anonymous klasses. |
331 || is_alive_closure->do_object_b(keep_alive_object()); | |
332 | |
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333 assert(!alive || claimed(), "must be claimed"); |
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334 return alive; |
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335 } |
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336 |
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337 |
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338 ClassLoaderData::~ClassLoaderData() { |
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339 // Release C heap structures for all the classes. |
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340 classes_do(InstanceKlass::release_C_heap_structures); |
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341 |
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342 Metaspace *m = _metaspace; |
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343 if (m != NULL) { |
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344 _metaspace = NULL; |
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345 // release the metaspace |
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346 delete m; |
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347 // release the handles |
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348 if (_handles != NULL) { |
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349 JNIHandleBlock::release_block(_handles); |
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350 _handles = NULL; |
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351 } |
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352 } |
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353 |
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354 // Clear all the JNI handles for methods |
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355 // These aren't deallocated and are going to look like a leak, but that's |
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356 // needed because we can't really get rid of jmethodIDs because we don't |
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357 // know when native code is going to stop using them. The spec says that |
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358 // they're "invalid" but existing programs likely rely on their being |
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359 // NULL after class unloading. |
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360 if (_jmethod_ids != NULL) { |
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361 Method::clear_jmethod_ids(this); |
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362 } |
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363 // Delete lock |
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364 delete _metaspace_lock; |
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365 |
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366 // Delete free list |
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367 if (_deallocate_list != NULL) { |
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368 delete _deallocate_list; |
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369 } |
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370 } |
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371 |
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372 /** |
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373 * Returns true if this class loader data is for the extension class loader. |
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374 */ |
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375 bool ClassLoaderData::is_ext_class_loader_data() const { |
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376 return SystemDictionary::is_ext_class_loader(class_loader()); |
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377 } |
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378 |
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379 Metaspace* ClassLoaderData::metaspace_non_null() { |
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380 assert(!DumpSharedSpaces, "wrong metaspace!"); |
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381 // If the metaspace has not been allocated, create a new one. Might want |
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382 // to create smaller arena for Reflection class loaders also. |
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383 // The reason for the delayed allocation is because some class loaders are |
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384 // simply for delegating with no metadata of their own. |
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385 if (_metaspace == NULL) { |
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386 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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387 // Check again if metaspace has been allocated while we were getting this lock. |
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388 if (_metaspace != NULL) { |
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389 return _metaspace; |
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390 } |
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391 if (this == the_null_class_loader_data()) { |
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392 assert (class_loader() == NULL, "Must be"); |
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393 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType)); |
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394 } else if (is_anonymous()) { |
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395 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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396 tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name()); |
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397 } |
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398 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType)); |
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399 } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) { |
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400 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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401 tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name()); |
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402 } |
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403 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType)); |
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404 } else { |
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405 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType)); |
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406 } |
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407 } |
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408 return _metaspace; |
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409 } |
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410 |
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411 JNIHandleBlock* ClassLoaderData::handles() const { return _handles; } |
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412 void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; } |
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413 |
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414 jobject ClassLoaderData::add_handle(Handle h) { |
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415 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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416 if (handles() == NULL) { |
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417 set_handles(JNIHandleBlock::allocate_block()); |
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418 } |
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419 return handles()->allocate_handle(h()); |
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420 } |
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421 |
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422 // Add this metadata pointer to be freed when it's safe. This is only during |
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423 // class unloading because Handles might point to this metadata field. |
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424 void ClassLoaderData::add_to_deallocate_list(Metadata* m) { |
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425 // Metadata in shared region isn't deleted. |
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426 if (!m->is_shared()) { |
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427 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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428 if (_deallocate_list == NULL) { |
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429 _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true); |
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430 } |
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431 _deallocate_list->append_if_missing(m); |
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432 } |
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433 } |
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434 |
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435 // Deallocate free metadata on the free list. How useful the PermGen was! |
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436 void ClassLoaderData::free_deallocate_list() { |
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437 // Don't need lock, at safepoint |
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438 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
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439 if (_deallocate_list == NULL) { |
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440 return; |
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441 } |
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442 // Go backwards because this removes entries that are freed. |
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443 for (int i = _deallocate_list->length() - 1; i >= 0; i--) { |
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444 Metadata* m = _deallocate_list->at(i); |
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445 if (!m->on_stack()) { |
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446 _deallocate_list->remove_at(i); |
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447 // There are only three types of metadata that we deallocate directly. |
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448 // Cast them so they can be used by the template function. |
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449 if (m->is_method()) { |
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450 MetadataFactory::free_metadata(this, (Method*)m); |
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451 } else if (m->is_constantPool()) { |
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452 MetadataFactory::free_metadata(this, (ConstantPool*)m); |
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453 } else if (m->is_klass()) { |
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454 MetadataFactory::free_metadata(this, (InstanceKlass*)m); |
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455 } else { |
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456 ShouldNotReachHere(); |
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457 } |
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458 } |
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459 } |
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460 } |
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461 |
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462 // These anonymous class loaders are to contain classes used for JSR292 |
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463 ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) { |
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464 // Add a new class loader data to the graph. |
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465 return ClassLoaderDataGraph::add(loader, true, CHECK_NULL); |
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466 } |
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467 |
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468 const char* ClassLoaderData::loader_name() { |
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469 // Handles null class loader |
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470 return SystemDictionary::loader_name(class_loader()); |
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471 } |
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472 |
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473 #ifndef PRODUCT |
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474 // Define to dump klasses |
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475 #undef CLD_DUMP_KLASSES |
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476 |
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477 void ClassLoaderData::dump(outputStream * const out) { |
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478 ResourceMark rm; |
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479 out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {", |
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480 this, (void *)class_loader(), |
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481 class_loader() != NULL ? class_loader()->klass() : NULL, loader_name()); |
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482 if (claimed()) out->print(" claimed "); |
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483 if (is_unloading()) out->print(" unloading "); |
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484 out->print(" handles " INTPTR_FORMAT, handles()); |
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485 out->cr(); |
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486 if (metaspace_or_null() != NULL) { |
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487 out->print_cr("metaspace: " PTR_FORMAT, metaspace_or_null()); |
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488 metaspace_or_null()->dump(out); |
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489 } else { |
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490 out->print_cr("metaspace: NULL"); |
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491 } |
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492 |
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493 #ifdef CLD_DUMP_KLASSES |
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494 if (Verbose) { |
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495 ResourceMark rm; |
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496 Klass* k = _klasses; |
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497 while (k != NULL) { |
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498 out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(), |
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499 k->has_modified_oops(), k->has_accumulated_modified_oops()); |
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500 assert(k != k->next_link(), "no loops!"); |
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501 k = k->next_link(); |
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502 } |
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503 } |
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504 #endif // CLD_DUMP_KLASSES |
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505 #undef CLD_DUMP_KLASSES |
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506 if (_jmethod_ids != NULL) { |
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507 Method::print_jmethod_ids(this, out); |
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508 } |
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509 out->print_cr("}"); |
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510 } |
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511 #endif // PRODUCT |
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512 |
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513 void ClassLoaderData::verify() { |
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514 oop cl = class_loader(); |
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515 |
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516 guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same"); |
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517 guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be"); |
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518 |
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519 // Verify the integrity of the allocated space. |
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520 if (metaspace_or_null() != NULL) { |
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521 metaspace_or_null()->verify(); |
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522 } |
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523 |
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524 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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525 guarantee(k->class_loader_data() == this, "Must be the same"); |
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526 k->verify(); |
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527 assert(k != k->next_link(), "no loops!"); |
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528 } |
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529 } |
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530 |
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531 |
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532 // GC root of class loader data created. |
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533 ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
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534 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
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535 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
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536 |
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537 // Add a new class loader data node to the list. Assign the newly created |
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538 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
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539 ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_anonymous, TRAPS) { |
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540 // We need to allocate all the oops for the ClassLoaderData before allocating the |
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541 // actual ClassLoaderData object. |
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542 ClassLoaderData::Dependencies dependencies(CHECK_NULL); |
7409 | 543 |
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544 No_Safepoint_Verifier no_safepoints; // we mustn't GC until we've installed the |
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545 // ClassLoaderData in the graph since the CLD |
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546 // contains unhandled oops |
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547 |
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548 ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous, dependencies); |
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549 |
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550 |
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551 if (!is_anonymous) { |
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552 ClassLoaderData** cld_addr = java_lang_ClassLoader::loader_data_addr(loader()); |
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553 // First, Atomically set it |
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554 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
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555 if (old != NULL) { |
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556 delete cld; |
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557 // Returns the data. |
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558 return old; |
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559 } |
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560 } |
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561 |
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562 // We won the race, and therefore the task of adding the data to the list of |
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563 // class loader data |
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564 ClassLoaderData** list_head = &_head; |
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565 ClassLoaderData* next = _head; |
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566 |
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567 do { |
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568 cld->set_next(next); |
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569 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
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570 if (exchanged == next) { |
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571 if (TraceClassLoaderData) { |
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572 ResourceMark rm; |
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573 tty->print("[ClassLoaderData: "); |
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574 tty->print("create class loader data "PTR_FORMAT, cld); |
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575 tty->print(" for instance "PTR_FORMAT" of %s", (void *)cld->class_loader(), |
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576 cld->loader_name()); |
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577 tty->print_cr("]"); |
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578 } |
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579 return cld; |
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580 } |
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581 next = exchanged; |
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582 } while (true); |
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583 |
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584 } |
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585 |
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586 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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587 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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588 cld->oops_do(f, klass_closure, must_claim); |
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589 } |
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590 } |
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591 |
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592 void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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593 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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594 if (cld->keep_alive()) { |
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595 cld->oops_do(f, klass_closure, must_claim); |
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596 } |
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597 } |
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598 } |
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599 |
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600 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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601 if (ClassUnloading) { |
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602 ClassLoaderDataGraph::keep_alive_oops_do(f, klass_closure, must_claim); |
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603 } else { |
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604 ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim); |
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605 } |
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606 } |
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607 |
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608 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
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609 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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610 cld->classes_do(klass_closure); |
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611 } |
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612 } |
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613 |
10405 | 614 void ClassLoaderDataGraph::classes_do(void f(Klass* const)) { |
615 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { | |
616 cld->classes_do(f); | |
617 } | |
618 } | |
619 | |
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620 void ClassLoaderDataGraph::loaded_classes_do(KlassClosure* klass_closure) { |
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621 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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622 cld->loaded_classes_do(klass_closure); |
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623 } |
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624 } |
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625 |
10405 | 626 void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) { |
627 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
628 for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) { | |
629 cld->classes_do(f); | |
630 } | |
631 } | |
632 | |
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633 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
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634 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
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635 |
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636 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
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637 |
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638 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
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639 ClassLoaderData* curr = _head; |
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640 while (curr != _saved_head) { |
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641 if (!curr->claimed()) { |
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642 array->push(curr); |
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643 |
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644 if (TraceClassLoaderData) { |
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645 tty->print("[ClassLoaderData] found new CLD: "); |
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646 curr->print_value_on(tty); |
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647 tty->cr(); |
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648 } |
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649 } |
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650 |
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651 curr = curr->_next; |
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652 } |
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653 |
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654 return array; |
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655 } |
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656 |
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657 // For profiling and hsfind() only. Otherwise, this is unsafe (and slow). This |
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658 // is done lock free to avoid lock inversion problems. It is safe because |
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659 // new ClassLoaderData are added to the end of the CLDG, and only removed at |
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660 // safepoint. The _unloading list can be deallocated concurrently with CMS so |
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661 // this doesn't look in metaspace for classes that have been unloaded. |
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662 bool ClassLoaderDataGraph::contains(const void* x) { |
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663 if (DumpSharedSpaces) { |
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664 // There are only two metaspaces to worry about. |
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665 ClassLoaderData* ncld = ClassLoaderData::the_null_class_loader_data(); |
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666 return (ncld->ro_metaspace()->contains(x) || ncld->rw_metaspace()->contains(x)); |
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667 } |
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668 |
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669 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(x)) { |
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670 return true; |
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671 } |
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672 |
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673 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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674 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
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675 return true; |
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676 } |
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677 } |
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678 |
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679 // Do not check unloading list because deallocation can be concurrent. |
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680 return false; |
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681 } |
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682 |
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683 #ifndef PRODUCT |
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684 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
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685 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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686 if (loader_data == data) { |
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687 return true; |
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688 } |
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689 } |
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690 |
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691 return false; |
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692 } |
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693 #endif // PRODUCT |
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694 |
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695 |
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696 // Move class loader data from main list to the unloaded list for unloading |
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697 // and deallocation later. |
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698 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure) { |
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699 ClassLoaderData* data = _head; |
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700 ClassLoaderData* prev = NULL; |
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701 bool seen_dead_loader = false; |
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702 // mark metadata seen on the stack and code cache so we can delete |
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703 // unneeded entries. |
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704 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
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705 MetadataOnStackMark md_on_stack; |
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706 while (data != NULL) { |
14484 | 707 if (data->is_alive(is_alive_closure)) { |
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708 if (has_redefined_a_class) { |
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709 data->classes_do(InstanceKlass::purge_previous_versions); |
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710 } |
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711 data->free_deallocate_list(); |
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712 prev = data; |
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713 data = data->next(); |
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714 continue; |
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715 } |
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716 seen_dead_loader = true; |
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717 ClassLoaderData* dead = data; |
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718 dead->unload(); |
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719 data = data->next(); |
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720 // Remove from loader list. |
10183
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8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
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721 // This class loader data will no longer be found |
868d87ed63c8
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722 // in the ClassLoaderDataGraph. |
6725
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723 if (prev != NULL) { |
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724 prev->set_next(data); |
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725 } else { |
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726 assert(dead == _head, "sanity check"); |
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727 _head = data; |
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728 } |
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729 dead->set_next(_unloading); |
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730 _unloading = dead; |
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731 } |
10405 | 732 |
733 if (seen_dead_loader) { | |
734 post_class_unload_events(); | |
735 } | |
736 | |
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737 return seen_dead_loader; |
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|
738 } |
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739 |
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740 void ClassLoaderDataGraph::purge() { |
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741 ClassLoaderData* list = _unloading; |
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742 _unloading = NULL; |
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743 ClassLoaderData* next = list; |
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744 while (next != NULL) { |
da91efe96a93
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745 ClassLoaderData* purge_me = next; |
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746 next = purge_me->next(); |
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747 delete purge_me; |
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748 } |
10175 | 749 Metaspace::purge(); |
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750 } |
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751 |
10405 | 752 void ClassLoaderDataGraph::post_class_unload_events(void) { |
753 #if INCLUDE_TRACE | |
754 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); | |
755 if (Tracing::enabled()) { | |
756 if (Tracing::is_event_enabled(TraceClassUnloadEvent)) { | |
757 assert(_unloading != NULL, "need class loader data unload list!"); | |
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758 _class_unload_time = Ticks::now(); |
10405 | 759 classes_unloading_do(&class_unload_event); |
760 } | |
761 Tracing::on_unloading_classes(); | |
762 } | |
763 #endif | |
764 } | |
765 | |
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766 // CDS support |
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|
767 |
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768 // Global metaspaces for writing information to the shared archive. When |
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769 // application CDS is supported, we may need one per metaspace, so this |
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770 // sort of looks like it. |
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771 Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
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772 Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
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773 static bool _shared_metaspaces_initialized = false; |
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|
774 |
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775 // Initialize shared metaspaces (change to call from somewhere not lazily) |
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776 void ClassLoaderData::initialize_shared_metaspaces() { |
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777 assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
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778 assert(this == ClassLoaderData::the_null_class_loader_data(), |
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779 "only supported for null loader data for now"); |
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780 assert (!_shared_metaspaces_initialized, "only initialize once"); |
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781 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
7446
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782 _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType); |
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783 _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType); |
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784 _shared_metaspaces_initialized = true; |
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|
785 } |
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786 |
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787 Metaspace* ClassLoaderData::ro_metaspace() { |
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788 assert(_ro_metaspace != NULL, "should already be initialized"); |
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789 return _ro_metaspace; |
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|
790 } |
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791 |
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792 Metaspace* ClassLoaderData::rw_metaspace() { |
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793 assert(_rw_metaspace != NULL, "should already be initialized"); |
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794 return _rw_metaspace; |
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795 } |
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|
796 |
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|
797 |
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798 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
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|
799 _data = ClassLoaderDataGraph::_head; |
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800 } |
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|
801 |
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|
802 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
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|
803 |
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|
804 #ifndef PRODUCT |
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|
805 // callable from debugger |
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|
806 extern "C" int print_loader_data_graph() { |
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|
807 ClassLoaderDataGraph::dump_on(tty); |
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|
808 return 0; |
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|
809 } |
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|
810 |
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811 void ClassLoaderDataGraph::verify() { |
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812 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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813 data->verify(); |
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814 } |
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815 } |
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816 |
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817 void ClassLoaderDataGraph::dump_on(outputStream * const out) { |
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818 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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819 data->dump(out); |
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820 } |
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821 MetaspaceAux::dump(out); |
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822 } |
7956 | 823 #endif // PRODUCT |
6725
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824 |
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825 void ClassLoaderData::print_value_on(outputStream* out) const { |
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826 if (class_loader() == NULL) { |
7956 | 827 out->print("NULL class_loader"); |
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828 } else { |
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829 out->print("class loader "PTR_FORMAT, this); |
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830 class_loader()->print_value_on(out); |
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831 } |
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832 } |
10405 | 833 |
834 #if INCLUDE_TRACE | |
835 | |
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836 Ticks ClassLoaderDataGraph::_class_unload_time; |
10405 | 837 |
838 void ClassLoaderDataGraph::class_unload_event(Klass* const k) { | |
839 | |
840 // post class unload event | |
841 EventClassUnload event(UNTIMED); | |
842 event.set_endtime(_class_unload_time); | |
843 event.set_unloadedClass(k); | |
844 oop defining_class_loader = k->class_loader(); | |
845 event.set_definingClassLoader(defining_class_loader != NULL ? | |
846 defining_class_loader->klass() : (Klass*)NULL); | |
847 event.commit(); | |
848 } | |
849 | |
850 #endif /* INCLUDE_TRACE */ |