Wed, 19 Nov 2014 12:52:56 -0800
Merge
coleenp@4037 | 1 | /* |
coleenp@6316 | 2 | * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved. |
coleenp@4037 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
coleenp@4037 | 4 | * |
coleenp@4037 | 5 | * This code is free software; you can redistribute it and/or modify it |
coleenp@4037 | 6 | * under the terms of the GNU General Public License version 2 only, as |
coleenp@4037 | 7 | * published by the Free Software Foundation. |
coleenp@4037 | 8 | * |
coleenp@4037 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
coleenp@4037 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
coleenp@4037 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
coleenp@4037 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
coleenp@4037 | 13 | * accompanied this code). |
coleenp@4037 | 14 | * |
coleenp@4037 | 15 | * You should have received a copy of the GNU General Public License version |
coleenp@4037 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
coleenp@4037 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
coleenp@4037 | 18 | * |
coleenp@4037 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
coleenp@4037 | 20 | * or visit www.oracle.com if you need additional information or have any |
coleenp@4037 | 21 | * questions. |
coleenp@4037 | 22 | * |
coleenp@4037 | 23 | */ |
coleenp@4037 | 24 | |
coleenp@4037 | 25 | // A ClassLoaderData identifies the full set of class types that a class |
coleenp@4037 | 26 | // loader's name resolution strategy produces for a given configuration of the |
coleenp@4037 | 27 | // class loader. |
coleenp@4037 | 28 | // Class types in the ClassLoaderData may be defined by from class file binaries |
coleenp@4037 | 29 | // provided by the class loader, or from other class loader it interacts with |
coleenp@4037 | 30 | // according to its name resolution strategy. |
coleenp@4037 | 31 | // |
coleenp@4037 | 32 | // Class loaders that implement a deterministic name resolution strategy |
coleenp@4037 | 33 | // (including with respect to their delegation behavior), such as the boot, the |
coleenp@4037 | 34 | // extension, and the system loaders of the JDK's built-in class loader |
coleenp@4037 | 35 | // hierarchy, always produce the same linkset for a given configuration. |
coleenp@4037 | 36 | // |
coleenp@4037 | 37 | // ClassLoaderData carries information related to a linkset (e.g., |
coleenp@4037 | 38 | // metaspace holding its klass definitions). |
coleenp@4037 | 39 | // The System Dictionary and related data structures (e.g., placeholder table, |
coleenp@4037 | 40 | // loader constraints table) as well as the runtime representation of classes |
coleenp@4037 | 41 | // only reference ClassLoaderData. |
coleenp@4037 | 42 | // |
coleenp@4037 | 43 | // Instances of java.lang.ClassLoader holds a pointer to a ClassLoaderData that |
coleenp@4037 | 44 | // that represent the loader's "linking domain" in the JVM. |
coleenp@4037 | 45 | // |
coleenp@4037 | 46 | // The bootstrap loader (represented by NULL) also has a ClassLoaderData, |
coleenp@4037 | 47 | // the singleton class the_null_class_loader_data(). |
coleenp@4037 | 48 | |
coleenp@4037 | 49 | #include "precompiled.hpp" |
coleenp@4037 | 50 | #include "classfile/classLoaderData.hpp" |
coleenp@4037 | 51 | #include "classfile/classLoaderData.inline.hpp" |
coleenp@4037 | 52 | #include "classfile/javaClasses.hpp" |
coleenp@4490 | 53 | #include "classfile/metadataOnStackMark.hpp" |
coleenp@4037 | 54 | #include "classfile/systemDictionary.hpp" |
coleenp@4037 | 55 | #include "code/codeCache.hpp" |
mgerdin@5013 | 56 | #include "memory/gcLocker.hpp" |
coleenp@4037 | 57 | #include "memory/metadataFactory.hpp" |
coleenp@4037 | 58 | #include "memory/metaspaceShared.hpp" |
coleenp@4490 | 59 | #include "memory/oopFactory.hpp" |
coleenp@4037 | 60 | #include "runtime/jniHandles.hpp" |
coleenp@4037 | 61 | #include "runtime/mutex.hpp" |
coleenp@4037 | 62 | #include "runtime/safepoint.hpp" |
coleenp@4037 | 63 | #include "runtime/synchronizer.hpp" |
coleenp@4037 | 64 | #include "utilities/growableArray.hpp" |
mgronlun@6131 | 65 | #include "utilities/macros.hpp" |
coleenp@4037 | 66 | #include "utilities/ostream.hpp" |
coleenp@4037 | 67 | |
sla@5237 | 68 | #if INCLUDE_TRACE |
sla@5237 | 69 | #include "trace/tracing.hpp" |
sla@5237 | 70 | #endif |
sla@5237 | 71 | |
coleenp@4037 | 72 | ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL; |
coleenp@4037 | 73 | |
mgerdin@5016 | 74 | ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies) : |
coleenp@4345 | 75 | _class_loader(h_class_loader()), |
stefank@6974 | 76 | _is_anonymous(is_anonymous), |
stefank@6974 | 77 | // An anonymous class loader data doesn't have anything to keep |
stefank@6974 | 78 | // it from being unloaded during parsing of the anonymous class. |
stefank@6974 | 79 | // The null-class-loader should always be kept alive. |
stefank@6974 | 80 | _keep_alive(is_anonymous || h_class_loader.is_null()), |
coleenp@4345 | 81 | _metaspace(NULL), _unloading(false), _klasses(NULL), |
coleenp@4304 | 82 | _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL), |
mgerdin@5016 | 83 | _next(NULL), _dependencies(dependencies), |
coleenp@4037 | 84 | _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) { |
coleenp@4037 | 85 | // empty |
coleenp@4037 | 86 | } |
coleenp@4037 | 87 | |
coleenp@4304 | 88 | void ClassLoaderData::init_dependencies(TRAPS) { |
mgerdin@5016 | 89 | assert(!Universe::is_fully_initialized(), "should only be called when initializing"); |
mgerdin@5016 | 90 | assert(is_the_null_class_loader_data(), "should only call this for the null class loader"); |
mgerdin@4903 | 91 | _dependencies.init(CHECK); |
mgerdin@4903 | 92 | } |
mgerdin@4903 | 93 | |
mgerdin@4903 | 94 | void ClassLoaderData::Dependencies::init(TRAPS) { |
coleenp@4304 | 95 | // Create empty dependencies array to add to. CMS requires this to be |
coleenp@4304 | 96 | // an oop so that it can track additions via card marks. We think. |
mgerdin@4903 | 97 | _list_head = oopFactory::new_objectArray(2, CHECK); |
coleenp@4304 | 98 | } |
coleenp@4304 | 99 | |
coleenp@4037 | 100 | bool ClassLoaderData::claim() { |
coleenp@4037 | 101 | if (_claimed == 1) { |
coleenp@4037 | 102 | return false; |
coleenp@4037 | 103 | } |
coleenp@4037 | 104 | |
coleenp@4037 | 105 | return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0; |
coleenp@4037 | 106 | } |
coleenp@4037 | 107 | |
coleenp@4037 | 108 | void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4037 | 109 | if (must_claim && !claim()) { |
coleenp@4037 | 110 | return; |
coleenp@4037 | 111 | } |
coleenp@4037 | 112 | |
coleenp@4037 | 113 | f->do_oop(&_class_loader); |
mgerdin@4903 | 114 | _dependencies.oops_do(f); |
coleenp@4037 | 115 | _handles->oops_do(f); |
coleenp@4037 | 116 | if (klass_closure != NULL) { |
coleenp@4037 | 117 | classes_do(klass_closure); |
coleenp@4037 | 118 | } |
coleenp@4037 | 119 | } |
coleenp@4037 | 120 | |
mgerdin@4903 | 121 | void ClassLoaderData::Dependencies::oops_do(OopClosure* f) { |
mgerdin@4903 | 122 | f->do_oop((oop*)&_list_head); |
mgerdin@4903 | 123 | } |
mgerdin@4903 | 124 | |
coleenp@4037 | 125 | void ClassLoaderData::classes_do(KlassClosure* klass_closure) { |
coleenp@4037 | 126 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 127 | klass_closure->do_klass(k); |
coleenp@4751 | 128 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 129 | } |
coleenp@4037 | 130 | } |
coleenp@4037 | 131 | |
sla@5237 | 132 | void ClassLoaderData::classes_do(void f(Klass * const)) { |
sla@5237 | 133 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
sla@5237 | 134 | f(k); |
sla@5237 | 135 | } |
sla@5237 | 136 | } |
sla@5237 | 137 | |
farvidsson@6024 | 138 | void ClassLoaderData::loaded_classes_do(KlassClosure* klass_closure) { |
farvidsson@6024 | 139 | // Lock to avoid classes being modified/added/removed during iteration |
farvidsson@6024 | 140 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
farvidsson@6024 | 141 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
farvidsson@6024 | 142 | // Do not filter ArrayKlass oops here... |
farvidsson@6024 | 143 | if (k->oop_is_array() || (k->oop_is_instance() && InstanceKlass::cast(k)->is_loaded())) { |
farvidsson@6024 | 144 | klass_closure->do_klass(k); |
farvidsson@6024 | 145 | } |
farvidsson@6024 | 146 | } |
farvidsson@6024 | 147 | } |
farvidsson@6024 | 148 | |
coleenp@4037 | 149 | void ClassLoaderData::classes_do(void f(InstanceKlass*)) { |
coleenp@4037 | 150 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 151 | if (k->oop_is_instance()) { |
coleenp@4037 | 152 | f(InstanceKlass::cast(k)); |
coleenp@4037 | 153 | } |
coleenp@4751 | 154 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 155 | } |
coleenp@4037 | 156 | } |
coleenp@4037 | 157 | |
coleenp@4037 | 158 | void ClassLoaderData::record_dependency(Klass* k, TRAPS) { |
coleenp@4037 | 159 | ClassLoaderData * const from_cld = this; |
coleenp@4037 | 160 | ClassLoaderData * const to_cld = k->class_loader_data(); |
coleenp@4037 | 161 | |
coleenp@4304 | 162 | // Dependency to the null class loader data doesn't need to be recorded |
coleenp@4304 | 163 | // because the null class loader data never goes away. |
coleenp@4304 | 164 | if (to_cld->is_the_null_class_loader_data()) { |
coleenp@4037 | 165 | return; |
coleenp@4037 | 166 | } |
coleenp@4037 | 167 | |
coleenp@4304 | 168 | oop to; |
coleenp@4304 | 169 | if (to_cld->is_anonymous()) { |
coleenp@4304 | 170 | // Anonymous class dependencies are through the mirror. |
coleenp@4304 | 171 | to = k->java_mirror(); |
coleenp@4304 | 172 | } else { |
coleenp@4304 | 173 | to = to_cld->class_loader(); |
coleenp@4037 | 174 | |
coleenp@4304 | 175 | // If from_cld is anonymous, even if it's class_loader is a parent of 'to' |
coleenp@4304 | 176 | // we still have to add it. The class_loader won't keep from_cld alive. |
coleenp@4304 | 177 | if (!from_cld->is_anonymous()) { |
coleenp@4304 | 178 | // Check that this dependency isn't from the same or parent class_loader |
coleenp@4304 | 179 | oop from = from_cld->class_loader(); |
coleenp@4304 | 180 | |
coleenp@4304 | 181 | oop curr = from; |
coleenp@4304 | 182 | while (curr != NULL) { |
coleenp@4304 | 183 | if (curr == to) { |
coleenp@4304 | 184 | return; // this class loader is in the parent list, no need to add it. |
coleenp@4304 | 185 | } |
coleenp@4304 | 186 | curr = java_lang_ClassLoader::parent(curr); |
coleenp@4304 | 187 | } |
coleenp@4037 | 188 | } |
coleenp@4037 | 189 | } |
coleenp@4037 | 190 | |
coleenp@4037 | 191 | // It's a dependency we won't find through GC, add it. This is relatively rare |
coleenp@4304 | 192 | // Must handle over GC point. |
coleenp@4304 | 193 | Handle dependency(THREAD, to); |
mgerdin@4903 | 194 | from_cld->_dependencies.add(dependency, CHECK); |
coleenp@4037 | 195 | } |
coleenp@4037 | 196 | |
coleenp@4037 | 197 | |
mgerdin@4903 | 198 | void ClassLoaderData::Dependencies::add(Handle dependency, TRAPS) { |
coleenp@4304 | 199 | // Check first if this dependency is already in the list. |
coleenp@4304 | 200 | // Save a pointer to the last to add to under the lock. |
mgerdin@4903 | 201 | objArrayOop ok = _list_head; |
coleenp@4304 | 202 | objArrayOop last = NULL; |
coleenp@4037 | 203 | while (ok != NULL) { |
coleenp@4304 | 204 | last = ok; |
coleenp@4304 | 205 | if (ok->obj_at(0) == dependency()) { |
coleenp@4304 | 206 | // Don't need to add it |
coleenp@4304 | 207 | return; |
coleenp@4037 | 208 | } |
coleenp@4037 | 209 | ok = (objArrayOop)ok->obj_at(1); |
coleenp@4037 | 210 | } |
coleenp@4304 | 211 | |
stefank@4353 | 212 | // Must handle over GC points |
stefank@4353 | 213 | assert (last != NULL, "dependencies should be initialized"); |
stefank@4353 | 214 | objArrayHandle last_handle(THREAD, last); |
stefank@4353 | 215 | |
coleenp@4304 | 216 | // Create a new dependency node with fields for (class_loader or mirror, next) |
coleenp@4304 | 217 | objArrayOop deps = oopFactory::new_objectArray(2, CHECK); |
coleenp@4304 | 218 | deps->obj_at_put(0, dependency()); |
coleenp@4304 | 219 | |
stefank@4353 | 220 | // Must handle over GC points |
coleenp@4304 | 221 | objArrayHandle new_dependency(THREAD, deps); |
coleenp@4304 | 222 | |
coleenp@4304 | 223 | // Add the dependency under lock |
mgerdin@4903 | 224 | locked_add(last_handle, new_dependency, THREAD); |
coleenp@4037 | 225 | } |
coleenp@4037 | 226 | |
mgerdin@4903 | 227 | void ClassLoaderData::Dependencies::locked_add(objArrayHandle last_handle, |
mgerdin@4903 | 228 | objArrayHandle new_dependency, |
mgerdin@4903 | 229 | Thread* THREAD) { |
coleenp@4304 | 230 | |
coleenp@4304 | 231 | // Have to lock and put the new dependency on the end of the dependency |
coleenp@4304 | 232 | // array so the card mark for CMS sees that this dependency is new. |
coleenp@4304 | 233 | // Can probably do this lock free with some effort. |
mgerdin@4903 | 234 | ObjectLocker ol(Handle(THREAD, _list_head), THREAD); |
coleenp@4304 | 235 | |
coleenp@4304 | 236 | oop loader_or_mirror = new_dependency->obj_at(0); |
coleenp@4304 | 237 | |
coleenp@4304 | 238 | // Since the dependencies are only added, add to the end. |
coleenp@4304 | 239 | objArrayOop end = last_handle(); |
coleenp@4304 | 240 | objArrayOop last = NULL; |
coleenp@4304 | 241 | while (end != NULL) { |
coleenp@4304 | 242 | last = end; |
coleenp@4304 | 243 | // check again if another thread added it to the end. |
coleenp@4304 | 244 | if (end->obj_at(0) == loader_or_mirror) { |
coleenp@4304 | 245 | // Don't need to add it |
coleenp@4304 | 246 | return; |
coleenp@4304 | 247 | } |
coleenp@4304 | 248 | end = (objArrayOop)end->obj_at(1); |
coleenp@4037 | 249 | } |
coleenp@4304 | 250 | assert (last != NULL, "dependencies should be initialized"); |
coleenp@4304 | 251 | // fill in the first element with the oop in new_dependency. |
coleenp@4304 | 252 | if (last->obj_at(0) == NULL) { |
coleenp@4304 | 253 | last->obj_at_put(0, new_dependency->obj_at(0)); |
coleenp@4304 | 254 | } else { |
coleenp@4304 | 255 | last->obj_at_put(1, new_dependency()); |
coleenp@4037 | 256 | } |
coleenp@4037 | 257 | } |
coleenp@4037 | 258 | |
coleenp@4037 | 259 | void ClassLoaderDataGraph::clear_claimed_marks() { |
coleenp@4037 | 260 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4037 | 261 | cld->clear_claimed(); |
coleenp@4037 | 262 | } |
coleenp@4037 | 263 | } |
coleenp@4037 | 264 | |
coleenp@4037 | 265 | void ClassLoaderData::add_class(Klass* k) { |
coleenp@4037 | 266 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 267 | Klass* old_value = _klasses; |
coleenp@4037 | 268 | k->set_next_link(old_value); |
coleenp@4037 | 269 | // link the new item into the list |
coleenp@4037 | 270 | _klasses = k; |
coleenp@4037 | 271 | |
coleenp@4304 | 272 | if (TraceClassLoaderData && Verbose && k->class_loader_data() != NULL) { |
coleenp@4037 | 273 | ResourceMark rm; |
coleenp@4037 | 274 | tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: " |
coleenp@4037 | 275 | PTR_FORMAT " loader: " PTR_FORMAT " %s", |
drchase@6680 | 276 | p2i(k), |
coleenp@4037 | 277 | k->external_name(), |
drchase@6680 | 278 | p2i(k->class_loader_data()), |
drchase@6680 | 279 | p2i((void *)k->class_loader()), |
coleenp@4304 | 280 | loader_name()); |
coleenp@4037 | 281 | } |
coleenp@4037 | 282 | } |
coleenp@4037 | 283 | |
coleenp@4037 | 284 | // This is called by InstanceKlass::deallocate_contents() to remove the |
coleenp@4037 | 285 | // scratch_class for redefine classes. We need a lock because there it may not |
coleenp@4037 | 286 | // be called at a safepoint if there's an error. |
coleenp@4037 | 287 | void ClassLoaderData::remove_class(Klass* scratch_class) { |
coleenp@4037 | 288 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 289 | Klass* prev = NULL; |
coleenp@4037 | 290 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 291 | if (k == scratch_class) { |
coleenp@4037 | 292 | if (prev == NULL) { |
coleenp@4037 | 293 | _klasses = k->next_link(); |
coleenp@4037 | 294 | } else { |
coleenp@4037 | 295 | Klass* next = k->next_link(); |
coleenp@4037 | 296 | prev->set_next_link(next); |
coleenp@4037 | 297 | } |
coleenp@4037 | 298 | return; |
coleenp@4037 | 299 | } |
coleenp@4037 | 300 | prev = k; |
coleenp@4751 | 301 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 302 | } |
coleenp@4037 | 303 | ShouldNotReachHere(); // should have found this class!! |
coleenp@4037 | 304 | } |
coleenp@4037 | 305 | |
coleenp@4304 | 306 | void ClassLoaderData::unload() { |
coleenp@4304 | 307 | _unloading = true; |
coleenp@4304 | 308 | |
coleenp@4981 | 309 | // Tell serviceability tools these classes are unloading |
coleenp@4981 | 310 | classes_do(InstanceKlass::notify_unload_class); |
coleenp@4981 | 311 | |
coleenp@4304 | 312 | if (TraceClassLoaderData) { |
coleenp@4304 | 313 | ResourceMark rm; |
drchase@6680 | 314 | tty->print("[ClassLoaderData: unload loader data " INTPTR_FORMAT, p2i(this)); |
drchase@6680 | 315 | tty->print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)class_loader()), |
coleenp@4304 | 316 | loader_name()); |
coleenp@4304 | 317 | if (is_anonymous()) { |
drchase@6680 | 318 | tty->print(" for anonymous class " INTPTR_FORMAT " ", p2i(_klasses)); |
coleenp@4304 | 319 | } |
coleenp@4304 | 320 | tty->print_cr("]"); |
coleenp@4304 | 321 | } |
coleenp@4304 | 322 | } |
coleenp@4304 | 323 | |
stefank@6992 | 324 | #ifdef ASSERT |
stefank@6992 | 325 | class AllAliveClosure : public OopClosure { |
stefank@6992 | 326 | BoolObjectClosure* _is_alive_closure; |
stefank@6992 | 327 | bool _found_dead; |
stefank@6992 | 328 | public: |
stefank@6992 | 329 | AllAliveClosure(BoolObjectClosure* is_alive_closure) : _is_alive_closure(is_alive_closure), _found_dead(false) {} |
stefank@6992 | 330 | template <typename T> void do_oop_work(T* p) { |
stefank@6992 | 331 | T heap_oop = oopDesc::load_heap_oop(p); |
stefank@6992 | 332 | if (!oopDesc::is_null(heap_oop)) { |
stefank@6992 | 333 | oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
stefank@6992 | 334 | if (!_is_alive_closure->do_object_b(obj)) { |
stefank@6992 | 335 | _found_dead = true; |
stefank@6992 | 336 | } |
stefank@6992 | 337 | } |
stefank@6992 | 338 | } |
stefank@6992 | 339 | void do_oop(oop* p) { do_oop_work<oop>(p); } |
stefank@6992 | 340 | void do_oop(narrowOop* p) { do_oop_work<narrowOop>(p); } |
stefank@6992 | 341 | bool found_dead() { return _found_dead; } |
stefank@6992 | 342 | }; |
stefank@6992 | 343 | #endif |
stefank@6992 | 344 | |
stefank@6974 | 345 | oop ClassLoaderData::keep_alive_object() const { |
stefank@6974 | 346 | assert(!keep_alive(), "Don't use with CLDs that are artificially kept alive"); |
stefank@6974 | 347 | return is_anonymous() ? _klasses->java_mirror() : class_loader(); |
stefank@6974 | 348 | } |
stefank@6974 | 349 | |
coleenp@4304 | 350 | bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { |
stefank@6974 | 351 | bool alive = keep_alive() // null class loader and incomplete anonymous klasses. |
stefank@6974 | 352 | || is_alive_closure->do_object_b(keep_alive_object()); |
stefank@6974 | 353 | |
stefank@6992 | 354 | #ifdef ASSERT |
stefank@6992 | 355 | if (alive) { |
stefank@6992 | 356 | AllAliveClosure all_alive_closure(is_alive_closure); |
stefank@6992 | 357 | KlassToOopClosure klass_closure(&all_alive_closure); |
stefank@6992 | 358 | const_cast<ClassLoaderData*>(this)->oops_do(&all_alive_closure, &klass_closure, false); |
stefank@6992 | 359 | assert(!all_alive_closure.found_dead(), err_msg("Found dead oop in alive cld: " PTR_FORMAT, p2i(this))); |
stefank@6992 | 360 | } |
stefank@6992 | 361 | #endif |
stefank@6992 | 362 | |
coleenp@4304 | 363 | return alive; |
coleenp@4304 | 364 | } |
coleenp@4304 | 365 | |
coleenp@4304 | 366 | |
coleenp@4037 | 367 | ClassLoaderData::~ClassLoaderData() { |
coleenp@4981 | 368 | // Release C heap structures for all the classes. |
coleenp@4981 | 369 | classes_do(InstanceKlass::release_C_heap_structures); |
coleenp@4981 | 370 | |
coleenp@4037 | 371 | Metaspace *m = _metaspace; |
coleenp@4037 | 372 | if (m != NULL) { |
coleenp@4037 | 373 | _metaspace = NULL; |
coleenp@4037 | 374 | // release the metaspace |
coleenp@4037 | 375 | delete m; |
coleenp@4037 | 376 | // release the handles |
coleenp@4037 | 377 | if (_handles != NULL) { |
coleenp@4037 | 378 | JNIHandleBlock::release_block(_handles); |
coleenp@4037 | 379 | _handles = NULL; |
coleenp@4037 | 380 | } |
coleenp@4037 | 381 | } |
coleenp@4037 | 382 | |
coleenp@4037 | 383 | // Clear all the JNI handles for methods |
coleenp@4037 | 384 | // These aren't deallocated and are going to look like a leak, but that's |
coleenp@4037 | 385 | // needed because we can't really get rid of jmethodIDs because we don't |
coleenp@4037 | 386 | // know when native code is going to stop using them. The spec says that |
coleenp@4037 | 387 | // they're "invalid" but existing programs likely rely on their being |
coleenp@4037 | 388 | // NULL after class unloading. |
coleenp@4037 | 389 | if (_jmethod_ids != NULL) { |
coleenp@4037 | 390 | Method::clear_jmethod_ids(this); |
coleenp@4037 | 391 | } |
coleenp@4037 | 392 | // Delete lock |
coleenp@4037 | 393 | delete _metaspace_lock; |
coleenp@4037 | 394 | |
coleenp@4037 | 395 | // Delete free list |
coleenp@4037 | 396 | if (_deallocate_list != NULL) { |
coleenp@4037 | 397 | delete _deallocate_list; |
coleenp@4037 | 398 | } |
coleenp@4037 | 399 | } |
coleenp@4037 | 400 | |
twisti@4866 | 401 | /** |
twisti@4866 | 402 | * Returns true if this class loader data is for the extension class loader. |
twisti@4866 | 403 | */ |
twisti@4866 | 404 | bool ClassLoaderData::is_ext_class_loader_data() const { |
twisti@4866 | 405 | return SystemDictionary::is_ext_class_loader(class_loader()); |
twisti@4866 | 406 | } |
twisti@4866 | 407 | |
coleenp@4037 | 408 | Metaspace* ClassLoaderData::metaspace_non_null() { |
jmasa@4457 | 409 | assert(!DumpSharedSpaces, "wrong metaspace!"); |
coleenp@4037 | 410 | // If the metaspace has not been allocated, create a new one. Might want |
coleenp@4037 | 411 | // to create smaller arena for Reflection class loaders also. |
coleenp@4037 | 412 | // The reason for the delayed allocation is because some class loaders are |
coleenp@4037 | 413 | // simply for delegating with no metadata of their own. |
coleenp@4037 | 414 | if (_metaspace == NULL) { |
coleenp@4037 | 415 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 416 | // Check again if metaspace has been allocated while we were getting this lock. |
coleenp@4037 | 417 | if (_metaspace != NULL) { |
coleenp@4037 | 418 | return _metaspace; |
coleenp@4037 | 419 | } |
coleenp@4304 | 420 | if (this == the_null_class_loader_data()) { |
coleenp@4304 | 421 | assert (class_loader() == NULL, "Must be"); |
jmasa@4382 | 422 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType)); |
jmasa@4382 | 423 | } else if (is_anonymous()) { |
jmasa@4382 | 424 | if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
jmasa@4382 | 425 | tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name()); |
jmasa@4382 | 426 | } |
jmasa@4382 | 427 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType)); |
jmasa@4382 | 428 | } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) { |
jmasa@4382 | 429 | if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
jmasa@4382 | 430 | tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name()); |
jmasa@4382 | 431 | } |
jmasa@4382 | 432 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType)); |
coleenp@4037 | 433 | } else { |
jmasa@4382 | 434 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType)); |
coleenp@4037 | 435 | } |
coleenp@4037 | 436 | } |
coleenp@4037 | 437 | return _metaspace; |
coleenp@4037 | 438 | } |
coleenp@4037 | 439 | |
coleenp@4037 | 440 | JNIHandleBlock* ClassLoaderData::handles() const { return _handles; } |
coleenp@4037 | 441 | void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; } |
coleenp@4037 | 442 | |
coleenp@4037 | 443 | jobject ClassLoaderData::add_handle(Handle h) { |
coleenp@4037 | 444 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 445 | if (handles() == NULL) { |
coleenp@4037 | 446 | set_handles(JNIHandleBlock::allocate_block()); |
coleenp@4037 | 447 | } |
coleenp@4037 | 448 | return handles()->allocate_handle(h()); |
coleenp@4037 | 449 | } |
coleenp@4037 | 450 | |
coleenp@4037 | 451 | // Add this metadata pointer to be freed when it's safe. This is only during |
coleenp@4037 | 452 | // class unloading because Handles might point to this metadata field. |
coleenp@4037 | 453 | void ClassLoaderData::add_to_deallocate_list(Metadata* m) { |
coleenp@4037 | 454 | // Metadata in shared region isn't deleted. |
coleenp@4037 | 455 | if (!m->is_shared()) { |
coleenp@4037 | 456 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 457 | if (_deallocate_list == NULL) { |
coleenp@4037 | 458 | _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true); |
coleenp@4037 | 459 | } |
coleenp@4037 | 460 | _deallocate_list->append_if_missing(m); |
coleenp@4037 | 461 | } |
coleenp@4037 | 462 | } |
coleenp@4037 | 463 | |
coleenp@4037 | 464 | // Deallocate free metadata on the free list. How useful the PermGen was! |
coleenp@4037 | 465 | void ClassLoaderData::free_deallocate_list() { |
coleenp@4037 | 466 | // Don't need lock, at safepoint |
coleenp@4037 | 467 | assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
coleenp@4037 | 468 | if (_deallocate_list == NULL) { |
coleenp@4037 | 469 | return; |
coleenp@4037 | 470 | } |
coleenp@4037 | 471 | // Go backwards because this removes entries that are freed. |
coleenp@4037 | 472 | for (int i = _deallocate_list->length() - 1; i >= 0; i--) { |
coleenp@4037 | 473 | Metadata* m = _deallocate_list->at(i); |
coleenp@4037 | 474 | if (!m->on_stack()) { |
coleenp@4037 | 475 | _deallocate_list->remove_at(i); |
coleenp@4037 | 476 | // There are only three types of metadata that we deallocate directly. |
coleenp@4037 | 477 | // Cast them so they can be used by the template function. |
coleenp@4037 | 478 | if (m->is_method()) { |
coleenp@4037 | 479 | MetadataFactory::free_metadata(this, (Method*)m); |
coleenp@4037 | 480 | } else if (m->is_constantPool()) { |
coleenp@4037 | 481 | MetadataFactory::free_metadata(this, (ConstantPool*)m); |
coleenp@4037 | 482 | } else if (m->is_klass()) { |
coleenp@4037 | 483 | MetadataFactory::free_metadata(this, (InstanceKlass*)m); |
coleenp@4037 | 484 | } else { |
coleenp@4037 | 485 | ShouldNotReachHere(); |
coleenp@4037 | 486 | } |
coleenp@4037 | 487 | } |
coleenp@4037 | 488 | } |
coleenp@4037 | 489 | } |
coleenp@4037 | 490 | |
coleenp@4304 | 491 | // These anonymous class loaders are to contain classes used for JSR292 |
coleenp@4304 | 492 | ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) { |
coleenp@4304 | 493 | // Add a new class loader data to the graph. |
mgerdin@5013 | 494 | return ClassLoaderDataGraph::add(loader, true, CHECK_NULL); |
coleenp@4037 | 495 | } |
coleenp@4037 | 496 | |
coleenp@4304 | 497 | const char* ClassLoaderData::loader_name() { |
coleenp@4304 | 498 | // Handles null class loader |
coleenp@4304 | 499 | return SystemDictionary::loader_name(class_loader()); |
coleenp@4304 | 500 | } |
coleenp@4304 | 501 | |
coleenp@4304 | 502 | #ifndef PRODUCT |
coleenp@4037 | 503 | // Define to dump klasses |
coleenp@4037 | 504 | #undef CLD_DUMP_KLASSES |
coleenp@4037 | 505 | |
coleenp@4037 | 506 | void ClassLoaderData::dump(outputStream * const out) { |
coleenp@4037 | 507 | ResourceMark rm; |
coleenp@4037 | 508 | out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {", |
drchase@6680 | 509 | p2i(this), p2i((void *)class_loader()), |
drchase@6680 | 510 | p2i(class_loader() != NULL ? class_loader()->klass() : NULL), loader_name()); |
coleenp@4037 | 511 | if (claimed()) out->print(" claimed "); |
coleenp@4037 | 512 | if (is_unloading()) out->print(" unloading "); |
drchase@6680 | 513 | out->print(" handles " INTPTR_FORMAT, p2i(handles())); |
coleenp@4037 | 514 | out->cr(); |
coleenp@4037 | 515 | if (metaspace_or_null() != NULL) { |
drchase@6680 | 516 | out->print_cr("metaspace: " INTPTR_FORMAT, p2i(metaspace_or_null())); |
coleenp@4037 | 517 | metaspace_or_null()->dump(out); |
coleenp@4037 | 518 | } else { |
coleenp@4037 | 519 | out->print_cr("metaspace: NULL"); |
coleenp@4037 | 520 | } |
coleenp@4037 | 521 | |
coleenp@4037 | 522 | #ifdef CLD_DUMP_KLASSES |
coleenp@4037 | 523 | if (Verbose) { |
coleenp@4037 | 524 | ResourceMark rm; |
coleenp@4037 | 525 | Klass* k = _klasses; |
coleenp@4037 | 526 | while (k != NULL) { |
coleenp@4037 | 527 | out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(), |
coleenp@4037 | 528 | k->has_modified_oops(), k->has_accumulated_modified_oops()); |
coleenp@4751 | 529 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 530 | k = k->next_link(); |
coleenp@4037 | 531 | } |
coleenp@4037 | 532 | } |
coleenp@4037 | 533 | #endif // CLD_DUMP_KLASSES |
coleenp@4037 | 534 | #undef CLD_DUMP_KLASSES |
coleenp@4037 | 535 | if (_jmethod_ids != NULL) { |
coleenp@4037 | 536 | Method::print_jmethod_ids(this, out); |
coleenp@4037 | 537 | } |
coleenp@4037 | 538 | out->print_cr("}"); |
coleenp@4037 | 539 | } |
coleenp@4037 | 540 | #endif // PRODUCT |
coleenp@4037 | 541 | |
coleenp@4037 | 542 | void ClassLoaderData::verify() { |
coleenp@4037 | 543 | oop cl = class_loader(); |
coleenp@4037 | 544 | |
coleenp@4304 | 545 | guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same"); |
coleenp@4304 | 546 | guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be"); |
coleenp@4037 | 547 | |
coleenp@4037 | 548 | // Verify the integrity of the allocated space. |
coleenp@4037 | 549 | if (metaspace_or_null() != NULL) { |
coleenp@4037 | 550 | metaspace_or_null()->verify(); |
coleenp@4037 | 551 | } |
coleenp@4037 | 552 | |
coleenp@4037 | 553 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 554 | guarantee(k->class_loader_data() == this, "Must be the same"); |
coleenp@4037 | 555 | k->verify(); |
coleenp@4751 | 556 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 557 | } |
coleenp@4037 | 558 | } |
coleenp@4037 | 559 | |
coleenp@6316 | 560 | bool ClassLoaderData::contains_klass(Klass* klass) { |
coleenp@6316 | 561 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@6316 | 562 | if (k == klass) return true; |
coleenp@6316 | 563 | } |
coleenp@6316 | 564 | return false; |
coleenp@6316 | 565 | } |
coleenp@6316 | 566 | |
coleenp@4304 | 567 | |
coleenp@4037 | 568 | // GC root of class loader data created. |
coleenp@4037 | 569 | ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
coleenp@4037 | 570 | ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
mgronlun@6742 | 571 | ClassLoaderData* ClassLoaderDataGraph::_saved_unloading = NULL; |
coleenp@4037 | 572 | ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
coleenp@4037 | 573 | |
coleenp@6678 | 574 | bool ClassLoaderDataGraph::_should_purge = false; |
coleenp@6678 | 575 | |
coleenp@4037 | 576 | // Add a new class loader data node to the list. Assign the newly created |
coleenp@4037 | 577 | // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
mgerdin@5013 | 578 | ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_anonymous, TRAPS) { |
mgerdin@5016 | 579 | // We need to allocate all the oops for the ClassLoaderData before allocating the |
mgerdin@5016 | 580 | // actual ClassLoaderData object. |
mgerdin@5016 | 581 | ClassLoaderData::Dependencies dependencies(CHECK_NULL); |
coleenp@4345 | 582 | |
mgerdin@5016 | 583 | No_Safepoint_Verifier no_safepoints; // we mustn't GC until we've installed the |
mgerdin@5016 | 584 | // ClassLoaderData in the graph since the CLD |
mgerdin@5016 | 585 | // contains unhandled oops |
coleenp@4037 | 586 | |
mgerdin@5016 | 587 | ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous, dependencies); |
mgerdin@5016 | 588 | |
mgerdin@4903 | 589 | |
mgerdin@5013 | 590 | if (!is_anonymous) { |
mgerdin@5013 | 591 | ClassLoaderData** cld_addr = java_lang_ClassLoader::loader_data_addr(loader()); |
coleenp@4304 | 592 | // First, Atomically set it |
coleenp@4304 | 593 | ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
coleenp@4304 | 594 | if (old != NULL) { |
coleenp@4304 | 595 | delete cld; |
coleenp@4304 | 596 | // Returns the data. |
coleenp@4304 | 597 | return old; |
coleenp@4304 | 598 | } |
coleenp@4037 | 599 | } |
coleenp@4037 | 600 | |
coleenp@4037 | 601 | // We won the race, and therefore the task of adding the data to the list of |
coleenp@4037 | 602 | // class loader data |
mgerdin@5013 | 603 | ClassLoaderData** list_head = &_head; |
mgerdin@5013 | 604 | ClassLoaderData* next = _head; |
mgerdin@5013 | 605 | |
coleenp@4037 | 606 | do { |
coleenp@4037 | 607 | cld->set_next(next); |
coleenp@4037 | 608 | ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
coleenp@4037 | 609 | if (exchanged == next) { |
coleenp@4037 | 610 | if (TraceClassLoaderData) { |
coleenp@4304 | 611 | ResourceMark rm; |
coleenp@4037 | 612 | tty->print("[ClassLoaderData: "); |
drchase@6680 | 613 | tty->print("create class loader data " INTPTR_FORMAT, p2i(cld)); |
drchase@6680 | 614 | tty->print(" for instance " INTPTR_FORMAT " of %s", p2i((void *)cld->class_loader()), |
coleenp@4304 | 615 | cld->loader_name()); |
coleenp@4037 | 616 | tty->print_cr("]"); |
coleenp@4037 | 617 | } |
coleenp@4037 | 618 | return cld; |
coleenp@4037 | 619 | } |
coleenp@4037 | 620 | next = exchanged; |
coleenp@4037 | 621 | } while (true); |
coleenp@4304 | 622 | |
coleenp@4037 | 623 | } |
coleenp@4037 | 624 | |
coleenp@4037 | 625 | void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4037 | 626 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4037 | 627 | cld->oops_do(f, klass_closure, must_claim); |
coleenp@4037 | 628 | } |
coleenp@4037 | 629 | } |
coleenp@4037 | 630 | |
coleenp@4304 | 631 | void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4304 | 632 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4304 | 633 | if (cld->keep_alive()) { |
coleenp@4304 | 634 | cld->oops_do(f, klass_closure, must_claim); |
coleenp@4304 | 635 | } |
coleenp@4304 | 636 | } |
coleenp@4304 | 637 | } |
coleenp@4304 | 638 | |
coleenp@4037 | 639 | void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4037 | 640 | if (ClassUnloading) { |
stefank@6992 | 641 | keep_alive_oops_do(f, klass_closure, must_claim); |
coleenp@4037 | 642 | } else { |
stefank@6992 | 643 | oops_do(f, klass_closure, must_claim); |
stefank@6992 | 644 | } |
stefank@6992 | 645 | } |
stefank@6992 | 646 | |
stefank@6992 | 647 | void ClassLoaderDataGraph::cld_do(CLDClosure* cl) { |
stefank@6992 | 648 | for (ClassLoaderData* cld = _head; cl != NULL && cld != NULL; cld = cld->next()) { |
stefank@6992 | 649 | cl->do_cld(cld); |
stefank@6992 | 650 | } |
stefank@6992 | 651 | } |
stefank@6992 | 652 | |
stefank@6992 | 653 | void ClassLoaderDataGraph::roots_cld_do(CLDClosure* strong, CLDClosure* weak) { |
stefank@6992 | 654 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->_next) { |
stefank@6992 | 655 | CLDClosure* closure = cld->keep_alive() ? strong : weak; |
stefank@6992 | 656 | if (closure != NULL) { |
stefank@6992 | 657 | closure->do_cld(cld); |
stefank@6992 | 658 | } |
stefank@6992 | 659 | } |
stefank@6992 | 660 | } |
stefank@6992 | 661 | |
stefank@6992 | 662 | void ClassLoaderDataGraph::keep_alive_cld_do(CLDClosure* cl) { |
stefank@6992 | 663 | roots_cld_do(cl, NULL); |
stefank@6992 | 664 | } |
stefank@6992 | 665 | |
stefank@6992 | 666 | void ClassLoaderDataGraph::always_strong_cld_do(CLDClosure* cl) { |
stefank@6992 | 667 | if (ClassUnloading) { |
stefank@6992 | 668 | keep_alive_cld_do(cl); |
stefank@6992 | 669 | } else { |
stefank@6992 | 670 | cld_do(cl); |
coleenp@4037 | 671 | } |
coleenp@4037 | 672 | } |
coleenp@4037 | 673 | |
coleenp@4037 | 674 | void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
coleenp@4037 | 675 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4037 | 676 | cld->classes_do(klass_closure); |
coleenp@4037 | 677 | } |
coleenp@4037 | 678 | } |
coleenp@4037 | 679 | |
sla@5237 | 680 | void ClassLoaderDataGraph::classes_do(void f(Klass* const)) { |
sla@5237 | 681 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
sla@5237 | 682 | cld->classes_do(f); |
sla@5237 | 683 | } |
sla@5237 | 684 | } |
sla@5237 | 685 | |
farvidsson@6024 | 686 | void ClassLoaderDataGraph::loaded_classes_do(KlassClosure* klass_closure) { |
farvidsson@6024 | 687 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
farvidsson@6024 | 688 | cld->loaded_classes_do(klass_closure); |
farvidsson@6024 | 689 | } |
farvidsson@6024 | 690 | } |
farvidsson@6024 | 691 | |
sla@5237 | 692 | void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) { |
sla@5237 | 693 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); |
mgronlun@6742 | 694 | // Only walk the head until any clds not purged from prior unloading |
mgronlun@6742 | 695 | // (CMS doesn't purge right away). |
mgronlun@6742 | 696 | for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) { |
sla@5237 | 697 | cld->classes_do(f); |
sla@5237 | 698 | } |
sla@5237 | 699 | } |
sla@5237 | 700 | |
coleenp@4037 | 701 | GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
coleenp@4037 | 702 | assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
coleenp@4037 | 703 | |
coleenp@4037 | 704 | GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
coleenp@4037 | 705 | |
coleenp@4037 | 706 | // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
coleenp@4037 | 707 | ClassLoaderData* curr = _head; |
coleenp@4037 | 708 | while (curr != _saved_head) { |
coleenp@4037 | 709 | if (!curr->claimed()) { |
coleenp@4037 | 710 | array->push(curr); |
coleenp@4037 | 711 | |
coleenp@4037 | 712 | if (TraceClassLoaderData) { |
coleenp@4037 | 713 | tty->print("[ClassLoaderData] found new CLD: "); |
coleenp@4037 | 714 | curr->print_value_on(tty); |
coleenp@4037 | 715 | tty->cr(); |
coleenp@4037 | 716 | } |
coleenp@4037 | 717 | } |
coleenp@4037 | 718 | |
coleenp@4037 | 719 | curr = curr->_next; |
coleenp@4037 | 720 | } |
coleenp@4037 | 721 | |
coleenp@4037 | 722 | return array; |
coleenp@4037 | 723 | } |
coleenp@4037 | 724 | |
stefank@6992 | 725 | bool ClassLoaderDataGraph::unload_list_contains(const void* x) { |
stefank@6992 | 726 | assert(SafepointSynchronize::is_at_safepoint(), "only safe to call at safepoint"); |
stefank@6992 | 727 | for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) { |
stefank@6992 | 728 | if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
stefank@6992 | 729 | return true; |
stefank@6992 | 730 | } |
stefank@6992 | 731 | } |
stefank@6992 | 732 | return false; |
stefank@6992 | 733 | } |
stefank@6992 | 734 | |
coleenp@6305 | 735 | #ifndef PRODUCT |
coleenp@4037 | 736 | bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
coleenp@4037 | 737 | for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
coleenp@4037 | 738 | if (loader_data == data) { |
coleenp@4037 | 739 | return true; |
coleenp@4037 | 740 | } |
coleenp@4037 | 741 | } |
coleenp@4037 | 742 | |
coleenp@4037 | 743 | return false; |
coleenp@4037 | 744 | } |
coleenp@4037 | 745 | #endif // PRODUCT |
coleenp@4037 | 746 | |
coleenp@4304 | 747 | |
coleenp@4037 | 748 | // Move class loader data from main list to the unloaded list for unloading |
coleenp@4037 | 749 | // and deallocation later. |
stefank@7333 | 750 | bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure, bool clean_alive) { |
coleenp@4037 | 751 | ClassLoaderData* data = _head; |
coleenp@4037 | 752 | ClassLoaderData* prev = NULL; |
coleenp@4037 | 753 | bool seen_dead_loader = false; |
mgronlun@6742 | 754 | |
mgronlun@6742 | 755 | // Save previous _unloading pointer for CMS which may add to unloading list before |
mgronlun@6742 | 756 | // purging and we don't want to rewalk the previously unloaded class loader data. |
mgronlun@6742 | 757 | _saved_unloading = _unloading; |
mgronlun@6742 | 758 | |
coleenp@4037 | 759 | while (data != NULL) { |
stefank@6974 | 760 | if (data->is_alive(is_alive_closure)) { |
coleenp@4037 | 761 | prev = data; |
coleenp@4037 | 762 | data = data->next(); |
coleenp@4037 | 763 | continue; |
coleenp@4037 | 764 | } |
coleenp@4037 | 765 | seen_dead_loader = true; |
coleenp@4037 | 766 | ClassLoaderData* dead = data; |
coleenp@4304 | 767 | dead->unload(); |
coleenp@4037 | 768 | data = data->next(); |
coleenp@4037 | 769 | // Remove from loader list. |
jmasa@5015 | 770 | // This class loader data will no longer be found |
jmasa@5015 | 771 | // in the ClassLoaderDataGraph. |
coleenp@4037 | 772 | if (prev != NULL) { |
coleenp@4037 | 773 | prev->set_next(data); |
coleenp@4037 | 774 | } else { |
coleenp@4037 | 775 | assert(dead == _head, "sanity check"); |
coleenp@4037 | 776 | _head = data; |
coleenp@4037 | 777 | } |
coleenp@4037 | 778 | dead->set_next(_unloading); |
coleenp@4037 | 779 | _unloading = dead; |
coleenp@4037 | 780 | } |
sla@5237 | 781 | |
stefank@7333 | 782 | if (clean_alive) { |
stefank@7333 | 783 | // Clean previous versions and the deallocate list. |
stefank@7333 | 784 | ClassLoaderDataGraph::clean_metaspaces(); |
stefank@7333 | 785 | } |
stefank@7333 | 786 | |
sla@5237 | 787 | if (seen_dead_loader) { |
sla@5237 | 788 | post_class_unload_events(); |
sla@5237 | 789 | } |
sla@5237 | 790 | |
coleenp@4037 | 791 | return seen_dead_loader; |
coleenp@4037 | 792 | } |
coleenp@4037 | 793 | |
stefank@7333 | 794 | void ClassLoaderDataGraph::clean_metaspaces() { |
stefank@7333 | 795 | // mark metadata seen on the stack and code cache so we can delete unneeded entries. |
stefank@7333 | 796 | bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
stefank@7333 | 797 | MetadataOnStackMark md_on_stack(has_redefined_a_class); |
stefank@7333 | 798 | |
stefank@7333 | 799 | if (has_redefined_a_class) { |
stefank@7333 | 800 | // purge_previous_versions also cleans weak method links. Because |
stefank@7333 | 801 | // one method's MDO can reference another method from another |
stefank@7333 | 802 | // class loader, we need to first clean weak method links for all |
stefank@7333 | 803 | // class loaders here. Below, we can then free redefined methods |
stefank@7333 | 804 | // for all class loaders. |
stefank@7333 | 805 | for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
stefank@7333 | 806 | data->classes_do(InstanceKlass::purge_previous_versions); |
stefank@7333 | 807 | } |
stefank@7333 | 808 | } |
stefank@7333 | 809 | |
stefank@7333 | 810 | // Need to purge the previous version before deallocating. |
stefank@7333 | 811 | free_deallocate_lists(); |
stefank@7333 | 812 | } |
stefank@7333 | 813 | |
coleenp@4037 | 814 | void ClassLoaderDataGraph::purge() { |
coleenp@6678 | 815 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); |
coleenp@4037 | 816 | ClassLoaderData* list = _unloading; |
coleenp@4037 | 817 | _unloading = NULL; |
coleenp@4037 | 818 | ClassLoaderData* next = list; |
coleenp@4037 | 819 | while (next != NULL) { |
coleenp@4037 | 820 | ClassLoaderData* purge_me = next; |
coleenp@4037 | 821 | next = purge_me->next(); |
coleenp@4037 | 822 | delete purge_me; |
coleenp@4037 | 823 | } |
jmasa@5007 | 824 | Metaspace::purge(); |
coleenp@4037 | 825 | } |
coleenp@4037 | 826 | |
sla@5237 | 827 | void ClassLoaderDataGraph::post_class_unload_events(void) { |
sla@5237 | 828 | #if INCLUDE_TRACE |
sla@5237 | 829 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); |
sla@5237 | 830 | if (Tracing::enabled()) { |
sla@5237 | 831 | if (Tracing::is_event_enabled(TraceClassUnloadEvent)) { |
sla@5237 | 832 | assert(_unloading != NULL, "need class loader data unload list!"); |
mgronlun@6131 | 833 | _class_unload_time = Ticks::now(); |
sla@5237 | 834 | classes_unloading_do(&class_unload_event); |
sla@5237 | 835 | } |
sla@5237 | 836 | Tracing::on_unloading_classes(); |
sla@5237 | 837 | } |
sla@5237 | 838 | #endif |
sla@5237 | 839 | } |
sla@5237 | 840 | |
stefank@7333 | 841 | void ClassLoaderDataGraph::free_deallocate_lists() { |
stefank@7333 | 842 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
stefank@7333 | 843 | // We need to keep this data until InstanceKlass::purge_previous_version has been |
stefank@7333 | 844 | // called on all alive classes. See the comment in ClassLoaderDataGraph::clean_metaspaces. |
stefank@7333 | 845 | cld->free_deallocate_list(); |
stefank@7333 | 846 | } |
stefank@7333 | 847 | } |
stefank@7333 | 848 | |
coleenp@4037 | 849 | // CDS support |
coleenp@4037 | 850 | |
coleenp@4037 | 851 | // Global metaspaces for writing information to the shared archive. When |
coleenp@4037 | 852 | // application CDS is supported, we may need one per metaspace, so this |
coleenp@4037 | 853 | // sort of looks like it. |
coleenp@4037 | 854 | Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
coleenp@4037 | 855 | Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
coleenp@4037 | 856 | static bool _shared_metaspaces_initialized = false; |
coleenp@4037 | 857 | |
coleenp@4037 | 858 | // Initialize shared metaspaces (change to call from somewhere not lazily) |
coleenp@4037 | 859 | void ClassLoaderData::initialize_shared_metaspaces() { |
coleenp@4037 | 860 | assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
coleenp@4037 | 861 | assert(this == ClassLoaderData::the_null_class_loader_data(), |
coleenp@4037 | 862 | "only supported for null loader data for now"); |
coleenp@4037 | 863 | assert (!_shared_metaspaces_initialized, "only initialize once"); |
coleenp@4037 | 864 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
jmasa@4382 | 865 | _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType); |
jmasa@4382 | 866 | _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType); |
coleenp@4037 | 867 | _shared_metaspaces_initialized = true; |
coleenp@4037 | 868 | } |
coleenp@4037 | 869 | |
coleenp@4037 | 870 | Metaspace* ClassLoaderData::ro_metaspace() { |
coleenp@4037 | 871 | assert(_ro_metaspace != NULL, "should already be initialized"); |
coleenp@4037 | 872 | return _ro_metaspace; |
coleenp@4037 | 873 | } |
coleenp@4037 | 874 | |
coleenp@4037 | 875 | Metaspace* ClassLoaderData::rw_metaspace() { |
coleenp@4037 | 876 | assert(_rw_metaspace != NULL, "should already be initialized"); |
coleenp@4037 | 877 | return _rw_metaspace; |
coleenp@4037 | 878 | } |
coleenp@4037 | 879 | |
stefank@6992 | 880 | ClassLoaderDataGraphKlassIteratorAtomic::ClassLoaderDataGraphKlassIteratorAtomic() |
stefank@6992 | 881 | : _next_klass(NULL) { |
stefank@6992 | 882 | ClassLoaderData* cld = ClassLoaderDataGraph::_head; |
stefank@6992 | 883 | Klass* klass = NULL; |
stefank@6992 | 884 | |
stefank@6992 | 885 | // Find the first klass in the CLDG. |
stefank@6992 | 886 | while (cld != NULL) { |
stefank@6992 | 887 | klass = cld->_klasses; |
stefank@6992 | 888 | if (klass != NULL) { |
stefank@6992 | 889 | _next_klass = klass; |
stefank@6992 | 890 | return; |
stefank@6992 | 891 | } |
stefank@6992 | 892 | cld = cld->next(); |
stefank@6992 | 893 | } |
stefank@6992 | 894 | } |
stefank@6992 | 895 | |
stefank@6992 | 896 | Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass_in_cldg(Klass* klass) { |
stefank@6992 | 897 | Klass* next = klass->next_link(); |
stefank@6992 | 898 | if (next != NULL) { |
stefank@6992 | 899 | return next; |
stefank@6992 | 900 | } |
stefank@6992 | 901 | |
stefank@6992 | 902 | // No more klasses in the current CLD. Time to find a new CLD. |
stefank@6992 | 903 | ClassLoaderData* cld = klass->class_loader_data(); |
stefank@6992 | 904 | while (next == NULL) { |
stefank@6992 | 905 | cld = cld->next(); |
stefank@6992 | 906 | if (cld == NULL) { |
stefank@6992 | 907 | break; |
stefank@6992 | 908 | } |
stefank@6992 | 909 | next = cld->_klasses; |
stefank@6992 | 910 | } |
stefank@6992 | 911 | |
stefank@6992 | 912 | return next; |
stefank@6992 | 913 | } |
stefank@6992 | 914 | |
stefank@6992 | 915 | Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass() { |
stefank@6992 | 916 | Klass* head = (Klass*)_next_klass; |
stefank@6992 | 917 | |
stefank@6992 | 918 | while (head != NULL) { |
stefank@6992 | 919 | Klass* next = next_klass_in_cldg(head); |
stefank@6992 | 920 | |
stefank@6992 | 921 | Klass* old_head = (Klass*)Atomic::cmpxchg_ptr(next, &_next_klass, head); |
stefank@6992 | 922 | |
stefank@6992 | 923 | if (old_head == head) { |
stefank@6992 | 924 | return head; // Won the CAS. |
stefank@6992 | 925 | } |
stefank@6992 | 926 | |
stefank@6992 | 927 | head = old_head; |
stefank@6992 | 928 | } |
stefank@6992 | 929 | |
stefank@6992 | 930 | // Nothing more for the iterator to hand out. |
stefank@6992 | 931 | assert(head == NULL, err_msg("head is " PTR_FORMAT ", expected not null:", p2i(head))); |
stefank@6992 | 932 | return NULL; |
stefank@6992 | 933 | } |
coleenp@4037 | 934 | |
coleenp@4037 | 935 | ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
coleenp@4037 | 936 | _data = ClassLoaderDataGraph::_head; |
coleenp@4037 | 937 | } |
coleenp@4037 | 938 | |
coleenp@4037 | 939 | ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
coleenp@4037 | 940 | |
coleenp@4037 | 941 | #ifndef PRODUCT |
coleenp@4037 | 942 | // callable from debugger |
coleenp@4037 | 943 | extern "C" int print_loader_data_graph() { |
coleenp@4037 | 944 | ClassLoaderDataGraph::dump_on(tty); |
coleenp@4037 | 945 | return 0; |
coleenp@4037 | 946 | } |
coleenp@4037 | 947 | |
coleenp@4037 | 948 | void ClassLoaderDataGraph::verify() { |
coleenp@4037 | 949 | for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
coleenp@4037 | 950 | data->verify(); |
coleenp@4037 | 951 | } |
coleenp@4037 | 952 | } |
coleenp@4037 | 953 | |
coleenp@4037 | 954 | void ClassLoaderDataGraph::dump_on(outputStream * const out) { |
coleenp@4037 | 955 | for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
coleenp@4037 | 956 | data->dump(out); |
coleenp@4037 | 957 | } |
coleenp@4037 | 958 | MetaspaceAux::dump(out); |
coleenp@4037 | 959 | } |
acorn@4497 | 960 | #endif // PRODUCT |
coleenp@4037 | 961 | |
coleenp@4037 | 962 | void ClassLoaderData::print_value_on(outputStream* out) const { |
coleenp@4037 | 963 | if (class_loader() == NULL) { |
acorn@4497 | 964 | out->print("NULL class_loader"); |
coleenp@4037 | 965 | } else { |
drchase@6680 | 966 | out->print("class loader " INTPTR_FORMAT, p2i(this)); |
coleenp@4037 | 967 | class_loader()->print_value_on(out); |
coleenp@4037 | 968 | } |
coleenp@4037 | 969 | } |
sla@5237 | 970 | |
sla@5237 | 971 | #if INCLUDE_TRACE |
sla@5237 | 972 | |
mgronlun@6131 | 973 | Ticks ClassLoaderDataGraph::_class_unload_time; |
sla@5237 | 974 | |
sla@5237 | 975 | void ClassLoaderDataGraph::class_unload_event(Klass* const k) { |
sla@5237 | 976 | |
sla@5237 | 977 | // post class unload event |
sla@5237 | 978 | EventClassUnload event(UNTIMED); |
sla@5237 | 979 | event.set_endtime(_class_unload_time); |
sla@5237 | 980 | event.set_unloadedClass(k); |
sla@5237 | 981 | oop defining_class_loader = k->class_loader(); |
sla@5237 | 982 | event.set_definingClassLoader(defining_class_loader != NULL ? |
sla@5237 | 983 | defining_class_loader->klass() : (Klass*)NULL); |
sla@5237 | 984 | event.commit(); |
sla@5237 | 985 | } |
sla@5237 | 986 | |
sla@5237 | 987 | #endif /* INCLUDE_TRACE */ |