Mercurial > hg > graal-compiler
annotate src/share/vm/classfile/classLoaderData.cpp @ 7607:eab4f9ed602c
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author | kvn |
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date | Thu, 17 Jan 2013 18:47:36 -0800 |
parents | e51c9860cf66 |
children | 59a58e20dc60 |
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1 /* |
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 // A ClassLoaderData identifies the full set of class types that a class |
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26 // loader's name resolution strategy produces for a given configuration of the |
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27 // class loader. |
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28 // Class types in the ClassLoaderData may be defined by from class file binaries |
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29 // provided by the class loader, or from other class loader it interacts with |
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30 // according to its name resolution strategy. |
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31 // |
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32 // Class loaders that implement a deterministic name resolution strategy |
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33 // (including with respect to their delegation behavior), such as the boot, the |
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34 // extension, and the system loaders of the JDK's built-in class loader |
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35 // hierarchy, always produce the same linkset for a given configuration. |
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36 // |
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37 // ClassLoaderData carries information related to a linkset (e.g., |
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38 // metaspace holding its klass definitions). |
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39 // The System Dictionary and related data structures (e.g., placeholder table, |
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40 // loader constraints table) as well as the runtime representation of classes |
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41 // only reference ClassLoaderData. |
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42 // |
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43 // Instances of java.lang.ClassLoader holds a pointer to a ClassLoaderData that |
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44 // that represent the loader's "linking domain" in the JVM. |
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45 // |
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46 // The bootstrap loader (represented by NULL) also has a ClassLoaderData, |
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47 // the singleton class the_null_class_loader_data(). |
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48 |
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49 #include "precompiled.hpp" |
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50 #include "classfile/classLoaderData.hpp" |
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51 #include "classfile/classLoaderData.inline.hpp" |
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52 #include "classfile/javaClasses.hpp" |
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53 #include "classfile/systemDictionary.hpp" |
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54 #include "code/codeCache.hpp" |
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55 #include "memory/metadataFactory.hpp" |
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56 #include "memory/metaspaceShared.hpp" |
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57 #include "prims/jvmtiRedefineClasses.hpp" |
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58 #include "runtime/jniHandles.hpp" |
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59 #include "runtime/mutex.hpp" |
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60 #include "runtime/safepoint.hpp" |
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61 #include "runtime/synchronizer.hpp" |
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62 #include "utilities/growableArray.hpp" |
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63 #include "utilities/ostream.hpp" |
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64 |
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65 ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL; |
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66 |
7409 | 67 ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous) : |
68 _class_loader(h_class_loader()), | |
69 _is_anonymous(is_anonymous), _keep_alive(is_anonymous), // initially | |
70 _metaspace(NULL), _unloading(false), _klasses(NULL), | |
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71 _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL), |
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72 _next(NULL), _dependencies(NULL), |
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73 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) { |
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74 // empty |
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75 } |
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76 |
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77 void ClassLoaderData::init_dependencies(TRAPS) { |
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78 // Create empty dependencies array to add to. CMS requires this to be |
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79 // an oop so that it can track additions via card marks. We think. |
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80 _dependencies = (oop)oopFactory::new_objectArray(2, CHECK); |
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81 } |
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82 |
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83 bool ClassLoaderData::claim() { |
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84 if (_claimed == 1) { |
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85 return false; |
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86 } |
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87 |
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88 return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0; |
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89 } |
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90 |
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91 void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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92 if (must_claim && !claim()) { |
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93 return; |
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94 } |
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95 |
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96 f->do_oop(&_class_loader); |
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97 f->do_oop(&_dependencies); |
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98 _handles->oops_do(f); |
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99 if (klass_closure != NULL) { |
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100 classes_do(klass_closure); |
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101 } |
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102 } |
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103 |
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104 void ClassLoaderData::classes_do(KlassClosure* klass_closure) { |
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105 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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106 klass_closure->do_klass(k); |
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107 } |
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108 } |
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109 |
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110 void ClassLoaderData::classes_do(void f(InstanceKlass*)) { |
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111 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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112 if (k->oop_is_instance()) { |
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113 f(InstanceKlass::cast(k)); |
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114 } |
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115 } |
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116 } |
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117 |
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118 void ClassLoaderData::record_dependency(Klass* k, TRAPS) { |
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119 ClassLoaderData * const from_cld = this; |
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120 ClassLoaderData * const to_cld = k->class_loader_data(); |
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121 |
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122 // Dependency to the null class loader data doesn't need to be recorded |
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123 // because the null class loader data never goes away. |
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124 if (to_cld->is_the_null_class_loader_data()) { |
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125 return; |
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126 } |
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127 |
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128 oop to; |
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129 if (to_cld->is_anonymous()) { |
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130 // Anonymous class dependencies are through the mirror. |
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131 to = k->java_mirror(); |
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132 } else { |
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133 to = to_cld->class_loader(); |
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134 |
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135 // If from_cld is anonymous, even if it's class_loader is a parent of 'to' |
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136 // we still have to add it. The class_loader won't keep from_cld alive. |
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137 if (!from_cld->is_anonymous()) { |
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138 // Check that this dependency isn't from the same or parent class_loader |
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139 oop from = from_cld->class_loader(); |
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140 |
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141 oop curr = from; |
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142 while (curr != NULL) { |
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143 if (curr == to) { |
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144 return; // this class loader is in the parent list, no need to add it. |
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145 } |
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146 curr = java_lang_ClassLoader::parent(curr); |
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147 } |
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148 } |
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149 } |
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150 |
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151 // It's a dependency we won't find through GC, add it. This is relatively rare |
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152 // Must handle over GC point. |
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153 Handle dependency(THREAD, to); |
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154 from_cld->add_dependency(dependency, CHECK); |
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155 } |
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156 |
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157 |
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158 void ClassLoaderData::add_dependency(Handle dependency, TRAPS) { |
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159 // Check first if this dependency is already in the list. |
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160 // Save a pointer to the last to add to under the lock. |
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161 objArrayOop ok = (objArrayOop)_dependencies; |
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162 objArrayOop last = NULL; |
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163 while (ok != NULL) { |
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164 last = ok; |
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165 if (ok->obj_at(0) == dependency()) { |
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166 // Don't need to add it |
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167 return; |
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168 } |
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169 ok = (objArrayOop)ok->obj_at(1); |
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170 } |
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171 |
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172 // Must handle over GC points |
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173 assert (last != NULL, "dependencies should be initialized"); |
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174 objArrayHandle last_handle(THREAD, last); |
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175 |
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176 // Create a new dependency node with fields for (class_loader or mirror, next) |
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177 objArrayOop deps = oopFactory::new_objectArray(2, CHECK); |
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178 deps->obj_at_put(0, dependency()); |
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179 |
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180 // Must handle over GC points |
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181 objArrayHandle new_dependency(THREAD, deps); |
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182 |
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183 // Add the dependency under lock |
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184 locked_add_dependency(last_handle, new_dependency); |
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185 } |
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186 |
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187 void ClassLoaderData::locked_add_dependency(objArrayHandle last_handle, |
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188 objArrayHandle new_dependency) { |
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189 |
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190 // Have to lock and put the new dependency on the end of the dependency |
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191 // array so the card mark for CMS sees that this dependency is new. |
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192 // Can probably do this lock free with some effort. |
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193 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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194 |
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195 oop loader_or_mirror = new_dependency->obj_at(0); |
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196 |
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197 // Since the dependencies are only added, add to the end. |
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198 objArrayOop end = last_handle(); |
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199 objArrayOop last = NULL; |
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200 while (end != NULL) { |
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201 last = end; |
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202 // check again if another thread added it to the end. |
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203 if (end->obj_at(0) == loader_or_mirror) { |
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204 // Don't need to add it |
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205 return; |
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206 } |
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207 end = (objArrayOop)end->obj_at(1); |
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208 } |
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209 assert (last != NULL, "dependencies should be initialized"); |
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210 // fill in the first element with the oop in new_dependency. |
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211 if (last->obj_at(0) == NULL) { |
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212 last->obj_at_put(0, new_dependency->obj_at(0)); |
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213 } else { |
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214 last->obj_at_put(1, new_dependency()); |
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215 } |
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216 } |
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217 |
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218 void ClassLoaderDataGraph::clear_claimed_marks() { |
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219 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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220 cld->clear_claimed(); |
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221 } |
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222 } |
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223 |
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224 void ClassLoaderData::add_class(Klass* k) { |
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225 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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226 Klass* old_value = _klasses; |
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227 k->set_next_link(old_value); |
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228 // link the new item into the list |
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229 _klasses = k; |
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230 |
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231 if (TraceClassLoaderData && Verbose && k->class_loader_data() != NULL) { |
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232 ResourceMark rm; |
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233 tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: " |
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234 PTR_FORMAT " loader: " PTR_FORMAT " %s", |
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235 k, |
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236 k->external_name(), |
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237 k->class_loader_data(), |
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238 k->class_loader(), |
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239 loader_name()); |
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240 } |
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241 } |
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242 |
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243 // This is called by InstanceKlass::deallocate_contents() to remove the |
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244 // scratch_class for redefine classes. We need a lock because there it may not |
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245 // be called at a safepoint if there's an error. |
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246 void ClassLoaderData::remove_class(Klass* scratch_class) { |
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247 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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248 Klass* prev = NULL; |
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249 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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250 if (k == scratch_class) { |
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251 if (prev == NULL) { |
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252 _klasses = k->next_link(); |
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253 } else { |
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254 Klass* next = k->next_link(); |
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255 prev->set_next_link(next); |
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256 } |
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257 return; |
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258 } |
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259 prev = k; |
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260 } |
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261 ShouldNotReachHere(); // should have found this class!! |
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262 } |
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263 |
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264 void ClassLoaderData::unload() { |
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265 _unloading = true; |
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266 |
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267 if (TraceClassLoaderData) { |
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268 ResourceMark rm; |
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269 tty->print("[ClassLoaderData: unload loader data "PTR_FORMAT, this); |
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270 tty->print(" for instance "PTR_FORMAT" of %s", class_loader(), |
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271 loader_name()); |
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272 if (is_anonymous()) { |
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273 tty->print(" for anonymous class "PTR_FORMAT " ", _klasses); |
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274 } |
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275 tty->print_cr("]"); |
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276 } |
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277 } |
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278 |
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279 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { |
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280 bool alive = |
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281 is_anonymous() ? |
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282 is_alive_closure->do_object_b(_klasses->java_mirror()) : |
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283 class_loader() == NULL || is_alive_closure->do_object_b(class_loader()); |
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284 assert(!alive || claimed(), "must be claimed"); |
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285 return alive; |
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286 } |
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287 |
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288 |
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289 ClassLoaderData::~ClassLoaderData() { |
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290 Metaspace *m = _metaspace; |
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291 if (m != NULL) { |
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292 _metaspace = NULL; |
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293 // release the metaspace |
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294 delete m; |
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295 // release the handles |
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296 if (_handles != NULL) { |
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297 JNIHandleBlock::release_block(_handles); |
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298 _handles = NULL; |
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299 } |
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300 } |
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301 |
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302 // Clear all the JNI handles for methods |
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303 // These aren't deallocated and are going to look like a leak, but that's |
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304 // needed because we can't really get rid of jmethodIDs because we don't |
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305 // know when native code is going to stop using them. The spec says that |
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306 // they're "invalid" but existing programs likely rely on their being |
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307 // NULL after class unloading. |
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308 if (_jmethod_ids != NULL) { |
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309 Method::clear_jmethod_ids(this); |
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310 } |
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311 // Delete lock |
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312 delete _metaspace_lock; |
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313 |
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314 // Delete free list |
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315 if (_deallocate_list != NULL) { |
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316 delete _deallocate_list; |
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317 } |
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318 } |
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319 |
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320 Metaspace* ClassLoaderData::metaspace_non_null() { |
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321 // If the metaspace has not been allocated, create a new one. Might want |
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322 // to create smaller arena for Reflection class loaders also. |
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323 // The reason for the delayed allocation is because some class loaders are |
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324 // simply for delegating with no metadata of their own. |
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325 if (_metaspace == NULL) { |
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326 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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327 // Check again if metaspace has been allocated while we were getting this lock. |
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328 if (_metaspace != NULL) { |
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329 return _metaspace; |
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330 } |
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331 if (this == the_null_class_loader_data()) { |
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332 assert (class_loader() == NULL, "Must be"); |
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333 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType)); |
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334 } else if (is_anonymous()) { |
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335 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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336 tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name()); |
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337 } |
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338 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType)); |
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339 } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) { |
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340 if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
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341 tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name()); |
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342 } |
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343 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType)); |
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344 } else { |
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345 set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType)); |
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346 } |
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347 } |
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348 return _metaspace; |
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349 } |
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350 |
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351 JNIHandleBlock* ClassLoaderData::handles() const { return _handles; } |
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352 void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; } |
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353 |
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354 jobject ClassLoaderData::add_handle(Handle h) { |
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355 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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356 if (handles() == NULL) { |
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357 set_handles(JNIHandleBlock::allocate_block()); |
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358 } |
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359 return handles()->allocate_handle(h()); |
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360 } |
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361 |
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362 // Add this metadata pointer to be freed when it's safe. This is only during |
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363 // class unloading because Handles might point to this metadata field. |
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364 void ClassLoaderData::add_to_deallocate_list(Metadata* m) { |
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365 // Metadata in shared region isn't deleted. |
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366 if (!m->is_shared()) { |
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367 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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368 if (_deallocate_list == NULL) { |
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369 _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true); |
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370 } |
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371 _deallocate_list->append_if_missing(m); |
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372 } |
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373 } |
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374 |
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375 // Deallocate free metadata on the free list. How useful the PermGen was! |
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376 void ClassLoaderData::free_deallocate_list() { |
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377 // Don't need lock, at safepoint |
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378 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
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379 if (_deallocate_list == NULL) { |
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380 return; |
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381 } |
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382 // Go backwards because this removes entries that are freed. |
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383 for (int i = _deallocate_list->length() - 1; i >= 0; i--) { |
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384 Metadata* m = _deallocate_list->at(i); |
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385 if (!m->on_stack()) { |
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386 _deallocate_list->remove_at(i); |
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387 // There are only three types of metadata that we deallocate directly. |
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388 // Cast them so they can be used by the template function. |
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389 if (m->is_method()) { |
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390 MetadataFactory::free_metadata(this, (Method*)m); |
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391 } else if (m->is_constantPool()) { |
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392 MetadataFactory::free_metadata(this, (ConstantPool*)m); |
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393 } else if (m->is_klass()) { |
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394 MetadataFactory::free_metadata(this, (InstanceKlass*)m); |
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395 } else { |
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396 ShouldNotReachHere(); |
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397 } |
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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 // These anonymous class loaders are to contain classes used for JSR292 |
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403 ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) { |
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404 // Add a new class loader data to the graph. |
7409 | 405 return ClassLoaderDataGraph::add(NULL, loader, CHECK_NULL); |
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406 } |
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407 |
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408 const char* ClassLoaderData::loader_name() { |
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409 // Handles null class loader |
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410 return SystemDictionary::loader_name(class_loader()); |
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411 } |
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412 |
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413 #ifndef PRODUCT |
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414 // Define to dump klasses |
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415 #undef CLD_DUMP_KLASSES |
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416 |
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417 void ClassLoaderData::dump(outputStream * const out) { |
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418 ResourceMark rm; |
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419 out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {", |
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420 this, class_loader(), |
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421 class_loader() != NULL ? class_loader()->klass() : NULL, loader_name()); |
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422 if (claimed()) out->print(" claimed "); |
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423 if (is_unloading()) out->print(" unloading "); |
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424 out->print(" handles " INTPTR_FORMAT, handles()); |
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425 out->cr(); |
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426 if (metaspace_or_null() != NULL) { |
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427 out->print_cr("metaspace: " PTR_FORMAT, metaspace_or_null()); |
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428 metaspace_or_null()->dump(out); |
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429 } else { |
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430 out->print_cr("metaspace: NULL"); |
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431 } |
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432 |
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433 #ifdef CLD_DUMP_KLASSES |
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434 if (Verbose) { |
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435 ResourceMark rm; |
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436 Klass* k = _klasses; |
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437 while (k != NULL) { |
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438 out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(), |
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439 k->has_modified_oops(), k->has_accumulated_modified_oops()); |
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440 k = k->next_link(); |
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441 } |
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442 } |
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443 #endif // CLD_DUMP_KLASSES |
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444 #undef CLD_DUMP_KLASSES |
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445 if (_jmethod_ids != NULL) { |
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446 Method::print_jmethod_ids(this, out); |
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447 } |
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448 out->print_cr("}"); |
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449 } |
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450 #endif // PRODUCT |
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451 |
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452 void ClassLoaderData::verify() { |
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453 oop cl = class_loader(); |
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454 |
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455 guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same"); |
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456 guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be"); |
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457 |
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458 // Verify the integrity of the allocated space. |
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459 if (metaspace_or_null() != NULL) { |
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460 metaspace_or_null()->verify(); |
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461 } |
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462 |
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463 for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
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464 guarantee(k->class_loader_data() == this, "Must be the same"); |
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465 k->verify(); |
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466 } |
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467 } |
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468 |
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469 |
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470 // GC root of class loader data created. |
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471 ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
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472 ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
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473 ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
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474 |
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475 |
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476 // Add a new class loader data node to the list. Assign the newly created |
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477 // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
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478 ClassLoaderData* ClassLoaderDataGraph::add(ClassLoaderData** cld_addr, Handle loader, TRAPS) { |
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479 // Not assigned a class loader data yet. |
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480 // Create one. |
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481 ClassLoaderData* *list_head = &_head; |
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482 ClassLoaderData* next = _head; |
7409 | 483 |
484 bool is_anonymous = (cld_addr == NULL); | |
485 ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous); | |
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486 |
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487 if (cld_addr != NULL) { |
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488 // First, Atomically set it |
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489 ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
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490 if (old != NULL) { |
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491 delete cld; |
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492 // Returns the data. |
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493 return old; |
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494 } |
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495 } |
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496 |
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497 // We won the race, and therefore the task of adding the data to the list of |
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498 // class loader data |
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499 do { |
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500 cld->set_next(next); |
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501 ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
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502 if (exchanged == next) { |
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503 if (TraceClassLoaderData) { |
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504 ResourceMark rm; |
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505 tty->print("[ClassLoaderData: "); |
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506 tty->print("create class loader data "PTR_FORMAT, cld); |
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507 tty->print(" for instance "PTR_FORMAT" of %s", cld->class_loader(), |
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508 cld->loader_name()); |
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509 tty->print_cr("]"); |
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510 } |
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511 // Create dependencies after the CLD is added to the list. Otherwise, |
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512 // the GC GC will not find the CLD and the _class_loader field will |
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513 // not be updated. |
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514 cld->init_dependencies(CHECK_NULL); |
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515 return cld; |
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516 } |
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517 next = exchanged; |
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518 } while (true); |
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519 |
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520 } |
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521 |
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522 void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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523 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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524 cld->oops_do(f, klass_closure, must_claim); |
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525 } |
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526 } |
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527 |
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528 void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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529 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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530 if (cld->keep_alive()) { |
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531 cld->oops_do(f, klass_closure, must_claim); |
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532 } |
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533 } |
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534 } |
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535 |
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536 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
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537 if (ClassUnloading) { |
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538 ClassLoaderData::the_null_class_loader_data()->oops_do(f, klass_closure, must_claim); |
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539 // keep any special CLDs alive. |
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540 ClassLoaderDataGraph::keep_alive_oops_do(f, klass_closure, must_claim); |
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541 } else { |
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542 ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim); |
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543 } |
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544 } |
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545 |
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546 void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
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547 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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548 cld->classes_do(klass_closure); |
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549 } |
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550 } |
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551 |
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552 GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
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553 assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
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554 |
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555 GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
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556 |
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557 // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
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558 ClassLoaderData* curr = _head; |
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559 while (curr != _saved_head) { |
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560 if (!curr->claimed()) { |
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561 array->push(curr); |
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562 |
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563 if (TraceClassLoaderData) { |
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564 tty->print("[ClassLoaderData] found new CLD: "); |
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565 curr->print_value_on(tty); |
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566 tty->cr(); |
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567 } |
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568 } |
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569 |
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570 curr = curr->_next; |
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571 } |
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572 |
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573 return array; |
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574 } |
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575 |
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576 #ifndef PRODUCT |
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577 // for debugging and hsfind(x) |
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578 bool ClassLoaderDataGraph::contains(address x) { |
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579 // I think we need the _metaspace_lock taken here because the class loader |
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580 // data graph could be changing while we are walking it (new entries added, |
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581 // new entries being unloaded, etc). |
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582 if (DumpSharedSpaces) { |
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583 // There are only two metaspaces to worry about. |
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584 ClassLoaderData* ncld = ClassLoaderData::the_null_class_loader_data(); |
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585 return (ncld->ro_metaspace()->contains(x) || ncld->rw_metaspace()->contains(x)); |
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586 } |
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587 |
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588 if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(x)) { |
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589 return true; |
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590 } |
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591 |
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592 for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
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593 if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
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594 return true; |
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595 } |
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596 } |
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597 |
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598 // Could also be on an unloading list which is okay, ie. still allocated |
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599 // for a little while. |
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600 for (ClassLoaderData* ucld = _unloading; ucld != NULL; ucld = ucld->next()) { |
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601 if (ucld->metaspace_or_null() != NULL && ucld->metaspace_or_null()->contains(x)) { |
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602 return true; |
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603 } |
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604 } |
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605 return false; |
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606 } |
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607 |
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608 bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
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609 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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610 if (loader_data == data) { |
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611 return true; |
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612 } |
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613 } |
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614 |
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615 return false; |
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616 } |
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617 #endif // PRODUCT |
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618 |
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619 |
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620 // Move class loader data from main list to the unloaded list for unloading |
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621 // and deallocation later. |
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622 bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure) { |
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623 ClassLoaderData* data = _head; |
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624 ClassLoaderData* prev = NULL; |
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625 bool seen_dead_loader = false; |
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626 // mark metadata seen on the stack and code cache so we can delete |
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627 // unneeded entries. |
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628 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
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629 MetadataOnStackMark md_on_stack; |
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630 while (data != NULL) { |
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631 if (data->keep_alive() || data->is_alive(is_alive_closure)) { |
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632 if (has_redefined_a_class) { |
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633 data->classes_do(InstanceKlass::purge_previous_versions); |
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634 } |
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635 data->free_deallocate_list(); |
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636 prev = data; |
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637 data = data->next(); |
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638 continue; |
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639 } |
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640 seen_dead_loader = true; |
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641 ClassLoaderData* dead = data; |
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642 dead->unload(); |
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643 data = data->next(); |
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644 // Remove from loader list. |
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645 if (prev != NULL) { |
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646 prev->set_next(data); |
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647 } else { |
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648 assert(dead == _head, "sanity check"); |
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649 _head = data; |
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650 } |
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651 dead->set_next(_unloading); |
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652 _unloading = dead; |
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653 } |
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654 return seen_dead_loader; |
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655 } |
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656 |
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657 void ClassLoaderDataGraph::purge() { |
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658 ClassLoaderData* list = _unloading; |
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659 _unloading = NULL; |
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660 ClassLoaderData* next = list; |
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661 while (next != NULL) { |
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662 ClassLoaderData* purge_me = next; |
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663 next = purge_me->next(); |
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664 delete purge_me; |
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665 } |
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666 } |
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667 |
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668 // CDS support |
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669 |
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670 // Global metaspaces for writing information to the shared archive. When |
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671 // application CDS is supported, we may need one per metaspace, so this |
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672 // sort of looks like it. |
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673 Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
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674 Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
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675 static bool _shared_metaspaces_initialized = false; |
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676 |
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677 // Initialize shared metaspaces (change to call from somewhere not lazily) |
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678 void ClassLoaderData::initialize_shared_metaspaces() { |
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679 assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
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680 assert(this == ClassLoaderData::the_null_class_loader_data(), |
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681 "only supported for null loader data for now"); |
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682 assert (!_shared_metaspaces_initialized, "only initialize once"); |
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683 MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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684 _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType); |
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685 _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType); |
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686 _shared_metaspaces_initialized = true; |
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687 } |
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688 |
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689 Metaspace* ClassLoaderData::ro_metaspace() { |
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690 assert(_ro_metaspace != NULL, "should already be initialized"); |
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691 return _ro_metaspace; |
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692 } |
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693 |
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694 Metaspace* ClassLoaderData::rw_metaspace() { |
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695 assert(_rw_metaspace != NULL, "should already be initialized"); |
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696 return _rw_metaspace; |
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697 } |
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698 |
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699 |
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700 ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
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701 _data = ClassLoaderDataGraph::_head; |
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702 } |
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703 |
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704 ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
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705 |
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706 #ifndef PRODUCT |
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707 // callable from debugger |
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708 extern "C" int print_loader_data_graph() { |
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709 ClassLoaderDataGraph::dump_on(tty); |
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710 return 0; |
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711 } |
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712 |
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713 void ClassLoaderDataGraph::verify() { |
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714 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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715 data->verify(); |
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716 } |
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717 } |
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718 |
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719 void ClassLoaderDataGraph::dump_on(outputStream * const out) { |
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720 for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
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721 data->dump(out); |
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722 } |
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723 MetaspaceAux::dump(out); |
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724 } |
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725 |
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726 void ClassLoaderData::print_value_on(outputStream* out) const { |
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727 if (class_loader() == NULL) { |
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728 out->print_cr("NULL class_loader"); |
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729 } else { |
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730 out->print("class loader "PTR_FORMAT, this); |
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731 class_loader()->print_value_on(out); |
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732 } |
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733 } |
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734 #endif // PRODUCT |