Fri, 30 Aug 2013 09:50:49 +0100
Merge
coleenp@4037 | 1 | /* |
coleenp@4490 | 2 | * Copyright (c) 2012, 2013, 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" |
coleenp@4037 | 65 | #include "utilities/ostream.hpp" |
coleenp@4037 | 66 | |
sla@5237 | 67 | #if INCLUDE_TRACE |
sla@5237 | 68 | #include "trace/tracing.hpp" |
sla@5237 | 69 | #endif |
sla@5237 | 70 | |
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()), |
coleenp@4345 | 76 | _is_anonymous(is_anonymous), _keep_alive(is_anonymous), // initially |
coleenp@4345 | 77 | _metaspace(NULL), _unloading(false), _klasses(NULL), |
coleenp@4304 | 78 | _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL), |
mgerdin@5016 | 79 | _next(NULL), _dependencies(dependencies), |
coleenp@4037 | 80 | _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) { |
coleenp@4037 | 81 | // empty |
coleenp@4037 | 82 | } |
coleenp@4037 | 83 | |
coleenp@4304 | 84 | void ClassLoaderData::init_dependencies(TRAPS) { |
mgerdin@5016 | 85 | assert(!Universe::is_fully_initialized(), "should only be called when initializing"); |
mgerdin@5016 | 86 | assert(is_the_null_class_loader_data(), "should only call this for the null class loader"); |
mgerdin@4903 | 87 | _dependencies.init(CHECK); |
mgerdin@4903 | 88 | } |
mgerdin@4903 | 89 | |
mgerdin@4903 | 90 | void ClassLoaderData::Dependencies::init(TRAPS) { |
coleenp@4304 | 91 | // Create empty dependencies array to add to. CMS requires this to be |
coleenp@4304 | 92 | // an oop so that it can track additions via card marks. We think. |
mgerdin@4903 | 93 | _list_head = oopFactory::new_objectArray(2, CHECK); |
coleenp@4304 | 94 | } |
coleenp@4304 | 95 | |
coleenp@4037 | 96 | bool ClassLoaderData::claim() { |
coleenp@4037 | 97 | if (_claimed == 1) { |
coleenp@4037 | 98 | return false; |
coleenp@4037 | 99 | } |
coleenp@4037 | 100 | |
coleenp@4037 | 101 | return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0; |
coleenp@4037 | 102 | } |
coleenp@4037 | 103 | |
coleenp@4037 | 104 | void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4037 | 105 | if (must_claim && !claim()) { |
coleenp@4037 | 106 | return; |
coleenp@4037 | 107 | } |
coleenp@4037 | 108 | |
coleenp@4037 | 109 | f->do_oop(&_class_loader); |
mgerdin@4903 | 110 | _dependencies.oops_do(f); |
coleenp@4037 | 111 | _handles->oops_do(f); |
coleenp@4037 | 112 | if (klass_closure != NULL) { |
coleenp@4037 | 113 | classes_do(klass_closure); |
coleenp@4037 | 114 | } |
coleenp@4037 | 115 | } |
coleenp@4037 | 116 | |
mgerdin@4903 | 117 | void ClassLoaderData::Dependencies::oops_do(OopClosure* f) { |
mgerdin@4903 | 118 | f->do_oop((oop*)&_list_head); |
mgerdin@4903 | 119 | } |
mgerdin@4903 | 120 | |
coleenp@4037 | 121 | void ClassLoaderData::classes_do(KlassClosure* klass_closure) { |
coleenp@4037 | 122 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 123 | klass_closure->do_klass(k); |
coleenp@4751 | 124 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 125 | } |
coleenp@4037 | 126 | } |
coleenp@4037 | 127 | |
sla@5237 | 128 | void ClassLoaderData::classes_do(void f(Klass * const)) { |
sla@5237 | 129 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
sla@5237 | 130 | f(k); |
sla@5237 | 131 | } |
sla@5237 | 132 | } |
sla@5237 | 133 | |
coleenp@4037 | 134 | void ClassLoaderData::classes_do(void f(InstanceKlass*)) { |
coleenp@4037 | 135 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 136 | if (k->oop_is_instance()) { |
coleenp@4037 | 137 | f(InstanceKlass::cast(k)); |
coleenp@4037 | 138 | } |
coleenp@4751 | 139 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 140 | } |
coleenp@4037 | 141 | } |
coleenp@4037 | 142 | |
coleenp@4037 | 143 | void ClassLoaderData::record_dependency(Klass* k, TRAPS) { |
coleenp@4037 | 144 | ClassLoaderData * const from_cld = this; |
coleenp@4037 | 145 | ClassLoaderData * const to_cld = k->class_loader_data(); |
coleenp@4037 | 146 | |
coleenp@4304 | 147 | // Dependency to the null class loader data doesn't need to be recorded |
coleenp@4304 | 148 | // because the null class loader data never goes away. |
coleenp@4304 | 149 | if (to_cld->is_the_null_class_loader_data()) { |
coleenp@4037 | 150 | return; |
coleenp@4037 | 151 | } |
coleenp@4037 | 152 | |
coleenp@4304 | 153 | oop to; |
coleenp@4304 | 154 | if (to_cld->is_anonymous()) { |
coleenp@4304 | 155 | // Anonymous class dependencies are through the mirror. |
coleenp@4304 | 156 | to = k->java_mirror(); |
coleenp@4304 | 157 | } else { |
coleenp@4304 | 158 | to = to_cld->class_loader(); |
coleenp@4037 | 159 | |
coleenp@4304 | 160 | // If from_cld is anonymous, even if it's class_loader is a parent of 'to' |
coleenp@4304 | 161 | // we still have to add it. The class_loader won't keep from_cld alive. |
coleenp@4304 | 162 | if (!from_cld->is_anonymous()) { |
coleenp@4304 | 163 | // Check that this dependency isn't from the same or parent class_loader |
coleenp@4304 | 164 | oop from = from_cld->class_loader(); |
coleenp@4304 | 165 | |
coleenp@4304 | 166 | oop curr = from; |
coleenp@4304 | 167 | while (curr != NULL) { |
coleenp@4304 | 168 | if (curr == to) { |
coleenp@4304 | 169 | return; // this class loader is in the parent list, no need to add it. |
coleenp@4304 | 170 | } |
coleenp@4304 | 171 | curr = java_lang_ClassLoader::parent(curr); |
coleenp@4304 | 172 | } |
coleenp@4037 | 173 | } |
coleenp@4037 | 174 | } |
coleenp@4037 | 175 | |
coleenp@4037 | 176 | // It's a dependency we won't find through GC, add it. This is relatively rare |
coleenp@4304 | 177 | // Must handle over GC point. |
coleenp@4304 | 178 | Handle dependency(THREAD, to); |
mgerdin@4903 | 179 | from_cld->_dependencies.add(dependency, CHECK); |
coleenp@4037 | 180 | } |
coleenp@4037 | 181 | |
coleenp@4037 | 182 | |
mgerdin@4903 | 183 | void ClassLoaderData::Dependencies::add(Handle dependency, TRAPS) { |
coleenp@4304 | 184 | // Check first if this dependency is already in the list. |
coleenp@4304 | 185 | // Save a pointer to the last to add to under the lock. |
mgerdin@4903 | 186 | objArrayOop ok = _list_head; |
coleenp@4304 | 187 | objArrayOop last = NULL; |
coleenp@4037 | 188 | while (ok != NULL) { |
coleenp@4304 | 189 | last = ok; |
coleenp@4304 | 190 | if (ok->obj_at(0) == dependency()) { |
coleenp@4304 | 191 | // Don't need to add it |
coleenp@4304 | 192 | return; |
coleenp@4037 | 193 | } |
coleenp@4037 | 194 | ok = (objArrayOop)ok->obj_at(1); |
coleenp@4037 | 195 | } |
coleenp@4304 | 196 | |
stefank@4353 | 197 | // Must handle over GC points |
stefank@4353 | 198 | assert (last != NULL, "dependencies should be initialized"); |
stefank@4353 | 199 | objArrayHandle last_handle(THREAD, last); |
stefank@4353 | 200 | |
coleenp@4304 | 201 | // Create a new dependency node with fields for (class_loader or mirror, next) |
coleenp@4304 | 202 | objArrayOop deps = oopFactory::new_objectArray(2, CHECK); |
coleenp@4304 | 203 | deps->obj_at_put(0, dependency()); |
coleenp@4304 | 204 | |
stefank@4353 | 205 | // Must handle over GC points |
coleenp@4304 | 206 | objArrayHandle new_dependency(THREAD, deps); |
coleenp@4304 | 207 | |
coleenp@4304 | 208 | // Add the dependency under lock |
mgerdin@4903 | 209 | locked_add(last_handle, new_dependency, THREAD); |
coleenp@4037 | 210 | } |
coleenp@4037 | 211 | |
mgerdin@4903 | 212 | void ClassLoaderData::Dependencies::locked_add(objArrayHandle last_handle, |
mgerdin@4903 | 213 | objArrayHandle new_dependency, |
mgerdin@4903 | 214 | Thread* THREAD) { |
coleenp@4304 | 215 | |
coleenp@4304 | 216 | // Have to lock and put the new dependency on the end of the dependency |
coleenp@4304 | 217 | // array so the card mark for CMS sees that this dependency is new. |
coleenp@4304 | 218 | // Can probably do this lock free with some effort. |
mgerdin@4903 | 219 | ObjectLocker ol(Handle(THREAD, _list_head), THREAD); |
coleenp@4304 | 220 | |
coleenp@4304 | 221 | oop loader_or_mirror = new_dependency->obj_at(0); |
coleenp@4304 | 222 | |
coleenp@4304 | 223 | // Since the dependencies are only added, add to the end. |
coleenp@4304 | 224 | objArrayOop end = last_handle(); |
coleenp@4304 | 225 | objArrayOop last = NULL; |
coleenp@4304 | 226 | while (end != NULL) { |
coleenp@4304 | 227 | last = end; |
coleenp@4304 | 228 | // check again if another thread added it to the end. |
coleenp@4304 | 229 | if (end->obj_at(0) == loader_or_mirror) { |
coleenp@4304 | 230 | // Don't need to add it |
coleenp@4304 | 231 | return; |
coleenp@4304 | 232 | } |
coleenp@4304 | 233 | end = (objArrayOop)end->obj_at(1); |
coleenp@4037 | 234 | } |
coleenp@4304 | 235 | assert (last != NULL, "dependencies should be initialized"); |
coleenp@4304 | 236 | // fill in the first element with the oop in new_dependency. |
coleenp@4304 | 237 | if (last->obj_at(0) == NULL) { |
coleenp@4304 | 238 | last->obj_at_put(0, new_dependency->obj_at(0)); |
coleenp@4304 | 239 | } else { |
coleenp@4304 | 240 | last->obj_at_put(1, new_dependency()); |
coleenp@4037 | 241 | } |
coleenp@4037 | 242 | } |
coleenp@4037 | 243 | |
coleenp@4037 | 244 | void ClassLoaderDataGraph::clear_claimed_marks() { |
coleenp@4037 | 245 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4037 | 246 | cld->clear_claimed(); |
coleenp@4037 | 247 | } |
coleenp@4037 | 248 | } |
coleenp@4037 | 249 | |
coleenp@4037 | 250 | void ClassLoaderData::add_class(Klass* k) { |
coleenp@4037 | 251 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 252 | Klass* old_value = _klasses; |
coleenp@4037 | 253 | k->set_next_link(old_value); |
coleenp@4037 | 254 | // link the new item into the list |
coleenp@4037 | 255 | _klasses = k; |
coleenp@4037 | 256 | |
coleenp@4304 | 257 | if (TraceClassLoaderData && Verbose && k->class_loader_data() != NULL) { |
coleenp@4037 | 258 | ResourceMark rm; |
coleenp@4037 | 259 | tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: " |
coleenp@4037 | 260 | PTR_FORMAT " loader: " PTR_FORMAT " %s", |
coleenp@4037 | 261 | k, |
coleenp@4037 | 262 | k->external_name(), |
coleenp@4037 | 263 | k->class_loader_data(), |
coleenp@4037 | 264 | k->class_loader(), |
coleenp@4304 | 265 | loader_name()); |
coleenp@4037 | 266 | } |
coleenp@4037 | 267 | } |
coleenp@4037 | 268 | |
coleenp@4037 | 269 | // This is called by InstanceKlass::deallocate_contents() to remove the |
coleenp@4037 | 270 | // scratch_class for redefine classes. We need a lock because there it may not |
coleenp@4037 | 271 | // be called at a safepoint if there's an error. |
coleenp@4037 | 272 | void ClassLoaderData::remove_class(Klass* scratch_class) { |
coleenp@4037 | 273 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 274 | Klass* prev = NULL; |
coleenp@4037 | 275 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 276 | if (k == scratch_class) { |
coleenp@4037 | 277 | if (prev == NULL) { |
coleenp@4037 | 278 | _klasses = k->next_link(); |
coleenp@4037 | 279 | } else { |
coleenp@4037 | 280 | Klass* next = k->next_link(); |
coleenp@4037 | 281 | prev->set_next_link(next); |
coleenp@4037 | 282 | } |
coleenp@4037 | 283 | return; |
coleenp@4037 | 284 | } |
coleenp@4037 | 285 | prev = k; |
coleenp@4751 | 286 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 287 | } |
coleenp@4037 | 288 | ShouldNotReachHere(); // should have found this class!! |
coleenp@4037 | 289 | } |
coleenp@4037 | 290 | |
coleenp@4304 | 291 | void ClassLoaderData::unload() { |
coleenp@4304 | 292 | _unloading = true; |
coleenp@4304 | 293 | |
coleenp@4981 | 294 | // Tell serviceability tools these classes are unloading |
coleenp@4981 | 295 | classes_do(InstanceKlass::notify_unload_class); |
coleenp@4981 | 296 | |
coleenp@4304 | 297 | if (TraceClassLoaderData) { |
coleenp@4304 | 298 | ResourceMark rm; |
coleenp@4304 | 299 | tty->print("[ClassLoaderData: unload loader data "PTR_FORMAT, this); |
coleenp@4304 | 300 | tty->print(" for instance "PTR_FORMAT" of %s", class_loader(), |
coleenp@4304 | 301 | loader_name()); |
coleenp@4304 | 302 | if (is_anonymous()) { |
coleenp@4304 | 303 | tty->print(" for anonymous class "PTR_FORMAT " ", _klasses); |
coleenp@4304 | 304 | } |
coleenp@4304 | 305 | tty->print_cr("]"); |
coleenp@4304 | 306 | } |
coleenp@4304 | 307 | } |
coleenp@4304 | 308 | |
coleenp@4304 | 309 | bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { |
coleenp@4304 | 310 | bool alive = |
coleenp@4304 | 311 | is_anonymous() ? |
coleenp@4304 | 312 | is_alive_closure->do_object_b(_klasses->java_mirror()) : |
coleenp@4304 | 313 | class_loader() == NULL || is_alive_closure->do_object_b(class_loader()); |
coleenp@4304 | 314 | assert(!alive || claimed(), "must be claimed"); |
coleenp@4304 | 315 | return alive; |
coleenp@4304 | 316 | } |
coleenp@4304 | 317 | |
coleenp@4304 | 318 | |
coleenp@4037 | 319 | ClassLoaderData::~ClassLoaderData() { |
coleenp@4981 | 320 | // Release C heap structures for all the classes. |
coleenp@4981 | 321 | classes_do(InstanceKlass::release_C_heap_structures); |
coleenp@4981 | 322 | |
coleenp@4037 | 323 | Metaspace *m = _metaspace; |
coleenp@4037 | 324 | if (m != NULL) { |
coleenp@4037 | 325 | _metaspace = NULL; |
coleenp@4037 | 326 | // release the metaspace |
coleenp@4037 | 327 | delete m; |
coleenp@4037 | 328 | // release the handles |
coleenp@4037 | 329 | if (_handles != NULL) { |
coleenp@4037 | 330 | JNIHandleBlock::release_block(_handles); |
coleenp@4037 | 331 | _handles = NULL; |
coleenp@4037 | 332 | } |
coleenp@4037 | 333 | } |
coleenp@4037 | 334 | |
coleenp@4037 | 335 | // Clear all the JNI handles for methods |
coleenp@4037 | 336 | // These aren't deallocated and are going to look like a leak, but that's |
coleenp@4037 | 337 | // needed because we can't really get rid of jmethodIDs because we don't |
coleenp@4037 | 338 | // know when native code is going to stop using them. The spec says that |
coleenp@4037 | 339 | // they're "invalid" but existing programs likely rely on their being |
coleenp@4037 | 340 | // NULL after class unloading. |
coleenp@4037 | 341 | if (_jmethod_ids != NULL) { |
coleenp@4037 | 342 | Method::clear_jmethod_ids(this); |
coleenp@4037 | 343 | } |
coleenp@4037 | 344 | // Delete lock |
coleenp@4037 | 345 | delete _metaspace_lock; |
coleenp@4037 | 346 | |
coleenp@4037 | 347 | // Delete free list |
coleenp@4037 | 348 | if (_deallocate_list != NULL) { |
coleenp@4037 | 349 | delete _deallocate_list; |
coleenp@4037 | 350 | } |
coleenp@4037 | 351 | } |
coleenp@4037 | 352 | |
twisti@4866 | 353 | /** |
twisti@4866 | 354 | * Returns true if this class loader data is for the extension class loader. |
twisti@4866 | 355 | */ |
twisti@4866 | 356 | bool ClassLoaderData::is_ext_class_loader_data() const { |
twisti@4866 | 357 | return SystemDictionary::is_ext_class_loader(class_loader()); |
twisti@4866 | 358 | } |
twisti@4866 | 359 | |
coleenp@4037 | 360 | Metaspace* ClassLoaderData::metaspace_non_null() { |
jmasa@4457 | 361 | assert(!DumpSharedSpaces, "wrong metaspace!"); |
coleenp@4037 | 362 | // If the metaspace has not been allocated, create a new one. Might want |
coleenp@4037 | 363 | // to create smaller arena for Reflection class loaders also. |
coleenp@4037 | 364 | // The reason for the delayed allocation is because some class loaders are |
coleenp@4037 | 365 | // simply for delegating with no metadata of their own. |
coleenp@4037 | 366 | if (_metaspace == NULL) { |
coleenp@4037 | 367 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 368 | // Check again if metaspace has been allocated while we were getting this lock. |
coleenp@4037 | 369 | if (_metaspace != NULL) { |
coleenp@4037 | 370 | return _metaspace; |
coleenp@4037 | 371 | } |
coleenp@4304 | 372 | if (this == the_null_class_loader_data()) { |
coleenp@4304 | 373 | assert (class_loader() == NULL, "Must be"); |
jmasa@4382 | 374 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType)); |
jmasa@4382 | 375 | } else if (is_anonymous()) { |
jmasa@4382 | 376 | if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
jmasa@4382 | 377 | tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name()); |
jmasa@4382 | 378 | } |
jmasa@4382 | 379 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType)); |
jmasa@4382 | 380 | } else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) { |
jmasa@4382 | 381 | if (TraceClassLoaderData && Verbose && class_loader() != NULL) { |
jmasa@4382 | 382 | tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name()); |
jmasa@4382 | 383 | } |
jmasa@4382 | 384 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType)); |
coleenp@4037 | 385 | } else { |
jmasa@4382 | 386 | set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType)); |
coleenp@4037 | 387 | } |
coleenp@4037 | 388 | } |
coleenp@4037 | 389 | return _metaspace; |
coleenp@4037 | 390 | } |
coleenp@4037 | 391 | |
coleenp@4037 | 392 | JNIHandleBlock* ClassLoaderData::handles() const { return _handles; } |
coleenp@4037 | 393 | void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; } |
coleenp@4037 | 394 | |
coleenp@4037 | 395 | jobject ClassLoaderData::add_handle(Handle h) { |
coleenp@4037 | 396 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 397 | if (handles() == NULL) { |
coleenp@4037 | 398 | set_handles(JNIHandleBlock::allocate_block()); |
coleenp@4037 | 399 | } |
coleenp@4037 | 400 | return handles()->allocate_handle(h()); |
coleenp@4037 | 401 | } |
coleenp@4037 | 402 | |
coleenp@4037 | 403 | // Add this metadata pointer to be freed when it's safe. This is only during |
coleenp@4037 | 404 | // class unloading because Handles might point to this metadata field. |
coleenp@4037 | 405 | void ClassLoaderData::add_to_deallocate_list(Metadata* m) { |
coleenp@4037 | 406 | // Metadata in shared region isn't deleted. |
coleenp@4037 | 407 | if (!m->is_shared()) { |
coleenp@4037 | 408 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
coleenp@4037 | 409 | if (_deallocate_list == NULL) { |
coleenp@4037 | 410 | _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true); |
coleenp@4037 | 411 | } |
coleenp@4037 | 412 | _deallocate_list->append_if_missing(m); |
coleenp@4037 | 413 | } |
coleenp@4037 | 414 | } |
coleenp@4037 | 415 | |
coleenp@4037 | 416 | // Deallocate free metadata on the free list. How useful the PermGen was! |
coleenp@4037 | 417 | void ClassLoaderData::free_deallocate_list() { |
coleenp@4037 | 418 | // Don't need lock, at safepoint |
coleenp@4037 | 419 | assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); |
coleenp@4037 | 420 | if (_deallocate_list == NULL) { |
coleenp@4037 | 421 | return; |
coleenp@4037 | 422 | } |
coleenp@4037 | 423 | // Go backwards because this removes entries that are freed. |
coleenp@4037 | 424 | for (int i = _deallocate_list->length() - 1; i >= 0; i--) { |
coleenp@4037 | 425 | Metadata* m = _deallocate_list->at(i); |
coleenp@4037 | 426 | if (!m->on_stack()) { |
coleenp@4037 | 427 | _deallocate_list->remove_at(i); |
coleenp@4037 | 428 | // There are only three types of metadata that we deallocate directly. |
coleenp@4037 | 429 | // Cast them so they can be used by the template function. |
coleenp@4037 | 430 | if (m->is_method()) { |
coleenp@4037 | 431 | MetadataFactory::free_metadata(this, (Method*)m); |
coleenp@4037 | 432 | } else if (m->is_constantPool()) { |
coleenp@4037 | 433 | MetadataFactory::free_metadata(this, (ConstantPool*)m); |
coleenp@4037 | 434 | } else if (m->is_klass()) { |
coleenp@4037 | 435 | MetadataFactory::free_metadata(this, (InstanceKlass*)m); |
coleenp@4037 | 436 | } else { |
coleenp@4037 | 437 | ShouldNotReachHere(); |
coleenp@4037 | 438 | } |
coleenp@4037 | 439 | } |
coleenp@4037 | 440 | } |
coleenp@4037 | 441 | } |
coleenp@4037 | 442 | |
coleenp@4304 | 443 | // These anonymous class loaders are to contain classes used for JSR292 |
coleenp@4304 | 444 | ClassLoaderData* ClassLoaderData::anonymous_class_loader_data(oop loader, TRAPS) { |
coleenp@4304 | 445 | // Add a new class loader data to the graph. |
mgerdin@5013 | 446 | return ClassLoaderDataGraph::add(loader, true, CHECK_NULL); |
coleenp@4037 | 447 | } |
coleenp@4037 | 448 | |
coleenp@4304 | 449 | const char* ClassLoaderData::loader_name() { |
coleenp@4304 | 450 | // Handles null class loader |
coleenp@4304 | 451 | return SystemDictionary::loader_name(class_loader()); |
coleenp@4304 | 452 | } |
coleenp@4304 | 453 | |
coleenp@4304 | 454 | #ifndef PRODUCT |
coleenp@4037 | 455 | // Define to dump klasses |
coleenp@4037 | 456 | #undef CLD_DUMP_KLASSES |
coleenp@4037 | 457 | |
coleenp@4037 | 458 | void ClassLoaderData::dump(outputStream * const out) { |
coleenp@4037 | 459 | ResourceMark rm; |
coleenp@4037 | 460 | out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {", |
coleenp@4037 | 461 | this, class_loader(), |
coleenp@4304 | 462 | class_loader() != NULL ? class_loader()->klass() : NULL, loader_name()); |
coleenp@4037 | 463 | if (claimed()) out->print(" claimed "); |
coleenp@4037 | 464 | if (is_unloading()) out->print(" unloading "); |
coleenp@4037 | 465 | out->print(" handles " INTPTR_FORMAT, handles()); |
coleenp@4037 | 466 | out->cr(); |
coleenp@4037 | 467 | if (metaspace_or_null() != NULL) { |
coleenp@4037 | 468 | out->print_cr("metaspace: " PTR_FORMAT, metaspace_or_null()); |
coleenp@4037 | 469 | metaspace_or_null()->dump(out); |
coleenp@4037 | 470 | } else { |
coleenp@4037 | 471 | out->print_cr("metaspace: NULL"); |
coleenp@4037 | 472 | } |
coleenp@4037 | 473 | |
coleenp@4037 | 474 | #ifdef CLD_DUMP_KLASSES |
coleenp@4037 | 475 | if (Verbose) { |
coleenp@4037 | 476 | ResourceMark rm; |
coleenp@4037 | 477 | Klass* k = _klasses; |
coleenp@4037 | 478 | while (k != NULL) { |
coleenp@4037 | 479 | out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(), |
coleenp@4037 | 480 | k->has_modified_oops(), k->has_accumulated_modified_oops()); |
coleenp@4751 | 481 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 482 | k = k->next_link(); |
coleenp@4037 | 483 | } |
coleenp@4037 | 484 | } |
coleenp@4037 | 485 | #endif // CLD_DUMP_KLASSES |
coleenp@4037 | 486 | #undef CLD_DUMP_KLASSES |
coleenp@4037 | 487 | if (_jmethod_ids != NULL) { |
coleenp@4037 | 488 | Method::print_jmethod_ids(this, out); |
coleenp@4037 | 489 | } |
coleenp@4037 | 490 | out->print_cr("}"); |
coleenp@4037 | 491 | } |
coleenp@4037 | 492 | #endif // PRODUCT |
coleenp@4037 | 493 | |
coleenp@4037 | 494 | void ClassLoaderData::verify() { |
coleenp@4037 | 495 | oop cl = class_loader(); |
coleenp@4037 | 496 | |
coleenp@4304 | 497 | guarantee(this == class_loader_data(cl) || is_anonymous(), "Must be the same"); |
coleenp@4304 | 498 | guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data() || is_anonymous(), "must be"); |
coleenp@4037 | 499 | |
coleenp@4037 | 500 | // Verify the integrity of the allocated space. |
coleenp@4037 | 501 | if (metaspace_or_null() != NULL) { |
coleenp@4037 | 502 | metaspace_or_null()->verify(); |
coleenp@4037 | 503 | } |
coleenp@4037 | 504 | |
coleenp@4037 | 505 | for (Klass* k = _klasses; k != NULL; k = k->next_link()) { |
coleenp@4037 | 506 | guarantee(k->class_loader_data() == this, "Must be the same"); |
coleenp@4037 | 507 | k->verify(); |
coleenp@4751 | 508 | assert(k != k->next_link(), "no loops!"); |
coleenp@4037 | 509 | } |
coleenp@4037 | 510 | } |
coleenp@4037 | 511 | |
coleenp@4304 | 512 | |
coleenp@4037 | 513 | // GC root of class loader data created. |
coleenp@4037 | 514 | ClassLoaderData* ClassLoaderDataGraph::_head = NULL; |
coleenp@4037 | 515 | ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL; |
coleenp@4037 | 516 | ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL; |
coleenp@4037 | 517 | |
coleenp@4037 | 518 | // Add a new class loader data node to the list. Assign the newly created |
coleenp@4037 | 519 | // ClassLoaderData into the java/lang/ClassLoader object as a hidden field |
mgerdin@5013 | 520 | ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_anonymous, TRAPS) { |
mgerdin@5016 | 521 | // We need to allocate all the oops for the ClassLoaderData before allocating the |
mgerdin@5016 | 522 | // actual ClassLoaderData object. |
mgerdin@5016 | 523 | ClassLoaderData::Dependencies dependencies(CHECK_NULL); |
coleenp@4345 | 524 | |
mgerdin@5016 | 525 | No_Safepoint_Verifier no_safepoints; // we mustn't GC until we've installed the |
mgerdin@5016 | 526 | // ClassLoaderData in the graph since the CLD |
mgerdin@5016 | 527 | // contains unhandled oops |
coleenp@4037 | 528 | |
mgerdin@5016 | 529 | ClassLoaderData* cld = new ClassLoaderData(loader, is_anonymous, dependencies); |
mgerdin@5016 | 530 | |
mgerdin@4903 | 531 | |
mgerdin@5013 | 532 | if (!is_anonymous) { |
mgerdin@5013 | 533 | ClassLoaderData** cld_addr = java_lang_ClassLoader::loader_data_addr(loader()); |
coleenp@4304 | 534 | // First, Atomically set it |
coleenp@4304 | 535 | ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL); |
coleenp@4304 | 536 | if (old != NULL) { |
coleenp@4304 | 537 | delete cld; |
coleenp@4304 | 538 | // Returns the data. |
coleenp@4304 | 539 | return old; |
coleenp@4304 | 540 | } |
coleenp@4037 | 541 | } |
coleenp@4037 | 542 | |
coleenp@4037 | 543 | // We won the race, and therefore the task of adding the data to the list of |
coleenp@4037 | 544 | // class loader data |
mgerdin@5013 | 545 | ClassLoaderData** list_head = &_head; |
mgerdin@5013 | 546 | ClassLoaderData* next = _head; |
mgerdin@5013 | 547 | |
coleenp@4037 | 548 | do { |
coleenp@4037 | 549 | cld->set_next(next); |
coleenp@4037 | 550 | ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next); |
coleenp@4037 | 551 | if (exchanged == next) { |
coleenp@4037 | 552 | if (TraceClassLoaderData) { |
coleenp@4304 | 553 | ResourceMark rm; |
coleenp@4037 | 554 | tty->print("[ClassLoaderData: "); |
coleenp@4037 | 555 | tty->print("create class loader data "PTR_FORMAT, cld); |
coleenp@4304 | 556 | tty->print(" for instance "PTR_FORMAT" of %s", cld->class_loader(), |
coleenp@4304 | 557 | cld->loader_name()); |
coleenp@4037 | 558 | tty->print_cr("]"); |
coleenp@4037 | 559 | } |
coleenp@4037 | 560 | return cld; |
coleenp@4037 | 561 | } |
coleenp@4037 | 562 | next = exchanged; |
coleenp@4037 | 563 | } while (true); |
coleenp@4304 | 564 | |
coleenp@4037 | 565 | } |
coleenp@4037 | 566 | |
coleenp@4037 | 567 | void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4037 | 568 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4037 | 569 | cld->oops_do(f, klass_closure, must_claim); |
coleenp@4037 | 570 | } |
coleenp@4037 | 571 | } |
coleenp@4037 | 572 | |
coleenp@4304 | 573 | void ClassLoaderDataGraph::keep_alive_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4304 | 574 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4304 | 575 | if (cld->keep_alive()) { |
coleenp@4304 | 576 | cld->oops_do(f, klass_closure, must_claim); |
coleenp@4304 | 577 | } |
coleenp@4304 | 578 | } |
coleenp@4304 | 579 | } |
coleenp@4304 | 580 | |
coleenp@4037 | 581 | void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { |
coleenp@4037 | 582 | if (ClassUnloading) { |
coleenp@4037 | 583 | ClassLoaderData::the_null_class_loader_data()->oops_do(f, klass_closure, must_claim); |
coleenp@4304 | 584 | // keep any special CLDs alive. |
coleenp@4304 | 585 | ClassLoaderDataGraph::keep_alive_oops_do(f, klass_closure, must_claim); |
coleenp@4037 | 586 | } else { |
coleenp@4037 | 587 | ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim); |
coleenp@4037 | 588 | } |
coleenp@4037 | 589 | } |
coleenp@4037 | 590 | |
coleenp@4037 | 591 | void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) { |
coleenp@4037 | 592 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4037 | 593 | cld->classes_do(klass_closure); |
coleenp@4037 | 594 | } |
coleenp@4037 | 595 | } |
coleenp@4037 | 596 | |
sla@5237 | 597 | void ClassLoaderDataGraph::classes_do(void f(Klass* const)) { |
sla@5237 | 598 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
sla@5237 | 599 | cld->classes_do(f); |
sla@5237 | 600 | } |
sla@5237 | 601 | } |
sla@5237 | 602 | |
sla@5237 | 603 | void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) { |
sla@5237 | 604 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); |
sla@5237 | 605 | for (ClassLoaderData* cld = _unloading; cld != NULL; cld = cld->next()) { |
sla@5237 | 606 | cld->classes_do(f); |
sla@5237 | 607 | } |
sla@5237 | 608 | } |
sla@5237 | 609 | |
coleenp@4037 | 610 | GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() { |
coleenp@4037 | 611 | assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?"); |
coleenp@4037 | 612 | |
coleenp@4037 | 613 | GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>(); |
coleenp@4037 | 614 | |
coleenp@4037 | 615 | // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true); |
coleenp@4037 | 616 | ClassLoaderData* curr = _head; |
coleenp@4037 | 617 | while (curr != _saved_head) { |
coleenp@4037 | 618 | if (!curr->claimed()) { |
coleenp@4037 | 619 | array->push(curr); |
coleenp@4037 | 620 | |
coleenp@4037 | 621 | if (TraceClassLoaderData) { |
coleenp@4037 | 622 | tty->print("[ClassLoaderData] found new CLD: "); |
coleenp@4037 | 623 | curr->print_value_on(tty); |
coleenp@4037 | 624 | tty->cr(); |
coleenp@4037 | 625 | } |
coleenp@4037 | 626 | } |
coleenp@4037 | 627 | |
coleenp@4037 | 628 | curr = curr->_next; |
coleenp@4037 | 629 | } |
coleenp@4037 | 630 | |
coleenp@4037 | 631 | return array; |
coleenp@4037 | 632 | } |
coleenp@4037 | 633 | |
coleenp@4037 | 634 | #ifndef PRODUCT |
coleenp@4037 | 635 | // for debugging and hsfind(x) |
coleenp@4037 | 636 | bool ClassLoaderDataGraph::contains(address x) { |
coleenp@4037 | 637 | // I think we need the _metaspace_lock taken here because the class loader |
coleenp@4037 | 638 | // data graph could be changing while we are walking it (new entries added, |
coleenp@4037 | 639 | // new entries being unloaded, etc). |
coleenp@4037 | 640 | if (DumpSharedSpaces) { |
coleenp@4037 | 641 | // There are only two metaspaces to worry about. |
coleenp@4037 | 642 | ClassLoaderData* ncld = ClassLoaderData::the_null_class_loader_data(); |
coleenp@4037 | 643 | return (ncld->ro_metaspace()->contains(x) || ncld->rw_metaspace()->contains(x)); |
coleenp@4037 | 644 | } |
coleenp@4037 | 645 | |
coleenp@4037 | 646 | if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(x)) { |
coleenp@4037 | 647 | return true; |
coleenp@4037 | 648 | } |
coleenp@4037 | 649 | |
coleenp@4037 | 650 | for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) { |
coleenp@4037 | 651 | if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) { |
coleenp@4037 | 652 | return true; |
coleenp@4037 | 653 | } |
coleenp@4037 | 654 | } |
coleenp@4037 | 655 | |
coleenp@4037 | 656 | // Could also be on an unloading list which is okay, ie. still allocated |
coleenp@4037 | 657 | // for a little while. |
coleenp@4037 | 658 | for (ClassLoaderData* ucld = _unloading; ucld != NULL; ucld = ucld->next()) { |
coleenp@4037 | 659 | if (ucld->metaspace_or_null() != NULL && ucld->metaspace_or_null()->contains(x)) { |
coleenp@4037 | 660 | return true; |
coleenp@4037 | 661 | } |
coleenp@4037 | 662 | } |
coleenp@4037 | 663 | return false; |
coleenp@4037 | 664 | } |
coleenp@4037 | 665 | |
coleenp@4037 | 666 | bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) { |
coleenp@4037 | 667 | for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
coleenp@4037 | 668 | if (loader_data == data) { |
coleenp@4037 | 669 | return true; |
coleenp@4037 | 670 | } |
coleenp@4037 | 671 | } |
coleenp@4037 | 672 | |
coleenp@4037 | 673 | return false; |
coleenp@4037 | 674 | } |
coleenp@4037 | 675 | #endif // PRODUCT |
coleenp@4037 | 676 | |
coleenp@4304 | 677 | |
coleenp@4037 | 678 | // Move class loader data from main list to the unloaded list for unloading |
coleenp@4037 | 679 | // and deallocation later. |
coleenp@4304 | 680 | bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure) { |
coleenp@4037 | 681 | ClassLoaderData* data = _head; |
coleenp@4037 | 682 | ClassLoaderData* prev = NULL; |
coleenp@4037 | 683 | bool seen_dead_loader = false; |
coleenp@4037 | 684 | // mark metadata seen on the stack and code cache so we can delete |
coleenp@4037 | 685 | // unneeded entries. |
coleenp@4037 | 686 | bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); |
coleenp@4037 | 687 | MetadataOnStackMark md_on_stack; |
coleenp@4037 | 688 | while (data != NULL) { |
coleenp@4304 | 689 | if (data->keep_alive() || data->is_alive(is_alive_closure)) { |
coleenp@4037 | 690 | if (has_redefined_a_class) { |
coleenp@4037 | 691 | data->classes_do(InstanceKlass::purge_previous_versions); |
coleenp@4037 | 692 | } |
coleenp@4037 | 693 | data->free_deallocate_list(); |
coleenp@4037 | 694 | prev = data; |
coleenp@4037 | 695 | data = data->next(); |
coleenp@4037 | 696 | continue; |
coleenp@4037 | 697 | } |
coleenp@4037 | 698 | seen_dead_loader = true; |
coleenp@4037 | 699 | ClassLoaderData* dead = data; |
coleenp@4304 | 700 | dead->unload(); |
coleenp@4037 | 701 | data = data->next(); |
coleenp@4037 | 702 | // Remove from loader list. |
jmasa@5015 | 703 | // This class loader data will no longer be found |
jmasa@5015 | 704 | // in the ClassLoaderDataGraph. |
coleenp@4037 | 705 | if (prev != NULL) { |
coleenp@4037 | 706 | prev->set_next(data); |
coleenp@4037 | 707 | } else { |
coleenp@4037 | 708 | assert(dead == _head, "sanity check"); |
coleenp@4037 | 709 | _head = data; |
coleenp@4037 | 710 | } |
coleenp@4037 | 711 | dead->set_next(_unloading); |
coleenp@4037 | 712 | _unloading = dead; |
coleenp@4037 | 713 | } |
sla@5237 | 714 | |
sla@5237 | 715 | if (seen_dead_loader) { |
sla@5237 | 716 | post_class_unload_events(); |
sla@5237 | 717 | } |
sla@5237 | 718 | |
coleenp@4037 | 719 | return seen_dead_loader; |
coleenp@4037 | 720 | } |
coleenp@4037 | 721 | |
coleenp@4037 | 722 | void ClassLoaderDataGraph::purge() { |
coleenp@4037 | 723 | ClassLoaderData* list = _unloading; |
coleenp@4037 | 724 | _unloading = NULL; |
coleenp@4037 | 725 | ClassLoaderData* next = list; |
coleenp@4037 | 726 | while (next != NULL) { |
coleenp@4037 | 727 | ClassLoaderData* purge_me = next; |
coleenp@4037 | 728 | next = purge_me->next(); |
coleenp@4037 | 729 | delete purge_me; |
coleenp@4037 | 730 | } |
jmasa@5007 | 731 | Metaspace::purge(); |
coleenp@4037 | 732 | } |
coleenp@4037 | 733 | |
sla@5237 | 734 | void ClassLoaderDataGraph::post_class_unload_events(void) { |
sla@5237 | 735 | #if INCLUDE_TRACE |
sla@5237 | 736 | assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!"); |
sla@5237 | 737 | if (Tracing::enabled()) { |
sla@5237 | 738 | if (Tracing::is_event_enabled(TraceClassUnloadEvent)) { |
sla@5237 | 739 | assert(_unloading != NULL, "need class loader data unload list!"); |
sla@5237 | 740 | _class_unload_time = Tracing::time(); |
sla@5237 | 741 | classes_unloading_do(&class_unload_event); |
sla@5237 | 742 | } |
sla@5237 | 743 | Tracing::on_unloading_classes(); |
sla@5237 | 744 | } |
sla@5237 | 745 | #endif |
sla@5237 | 746 | } |
sla@5237 | 747 | |
coleenp@4037 | 748 | // CDS support |
coleenp@4037 | 749 | |
coleenp@4037 | 750 | // Global metaspaces for writing information to the shared archive. When |
coleenp@4037 | 751 | // application CDS is supported, we may need one per metaspace, so this |
coleenp@4037 | 752 | // sort of looks like it. |
coleenp@4037 | 753 | Metaspace* ClassLoaderData::_ro_metaspace = NULL; |
coleenp@4037 | 754 | Metaspace* ClassLoaderData::_rw_metaspace = NULL; |
coleenp@4037 | 755 | static bool _shared_metaspaces_initialized = false; |
coleenp@4037 | 756 | |
coleenp@4037 | 757 | // Initialize shared metaspaces (change to call from somewhere not lazily) |
coleenp@4037 | 758 | void ClassLoaderData::initialize_shared_metaspaces() { |
coleenp@4037 | 759 | assert(DumpSharedSpaces, "only use this for dumping shared spaces"); |
coleenp@4037 | 760 | assert(this == ClassLoaderData::the_null_class_loader_data(), |
coleenp@4037 | 761 | "only supported for null loader data for now"); |
coleenp@4037 | 762 | assert (!_shared_metaspaces_initialized, "only initialize once"); |
coleenp@4037 | 763 | MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag); |
jmasa@4382 | 764 | _ro_metaspace = new Metaspace(_metaspace_lock, Metaspace::ROMetaspaceType); |
jmasa@4382 | 765 | _rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType); |
coleenp@4037 | 766 | _shared_metaspaces_initialized = true; |
coleenp@4037 | 767 | } |
coleenp@4037 | 768 | |
coleenp@4037 | 769 | Metaspace* ClassLoaderData::ro_metaspace() { |
coleenp@4037 | 770 | assert(_ro_metaspace != NULL, "should already be initialized"); |
coleenp@4037 | 771 | return _ro_metaspace; |
coleenp@4037 | 772 | } |
coleenp@4037 | 773 | |
coleenp@4037 | 774 | Metaspace* ClassLoaderData::rw_metaspace() { |
coleenp@4037 | 775 | assert(_rw_metaspace != NULL, "should already be initialized"); |
coleenp@4037 | 776 | return _rw_metaspace; |
coleenp@4037 | 777 | } |
coleenp@4037 | 778 | |
coleenp@4037 | 779 | |
coleenp@4037 | 780 | ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() { |
coleenp@4037 | 781 | _data = ClassLoaderDataGraph::_head; |
coleenp@4037 | 782 | } |
coleenp@4037 | 783 | |
coleenp@4037 | 784 | ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {} |
coleenp@4037 | 785 | |
coleenp@4037 | 786 | #ifndef PRODUCT |
coleenp@4037 | 787 | // callable from debugger |
coleenp@4037 | 788 | extern "C" int print_loader_data_graph() { |
coleenp@4037 | 789 | ClassLoaderDataGraph::dump_on(tty); |
coleenp@4037 | 790 | return 0; |
coleenp@4037 | 791 | } |
coleenp@4037 | 792 | |
coleenp@4037 | 793 | void ClassLoaderDataGraph::verify() { |
coleenp@4037 | 794 | for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
coleenp@4037 | 795 | data->verify(); |
coleenp@4037 | 796 | } |
coleenp@4037 | 797 | } |
coleenp@4037 | 798 | |
coleenp@4037 | 799 | void ClassLoaderDataGraph::dump_on(outputStream * const out) { |
coleenp@4037 | 800 | for (ClassLoaderData* data = _head; data != NULL; data = data->next()) { |
coleenp@4037 | 801 | data->dump(out); |
coleenp@4037 | 802 | } |
coleenp@4037 | 803 | MetaspaceAux::dump(out); |
coleenp@4037 | 804 | } |
acorn@4497 | 805 | #endif // PRODUCT |
coleenp@4037 | 806 | |
coleenp@4037 | 807 | void ClassLoaderData::print_value_on(outputStream* out) const { |
coleenp@4037 | 808 | if (class_loader() == NULL) { |
acorn@4497 | 809 | out->print("NULL class_loader"); |
coleenp@4037 | 810 | } else { |
coleenp@4037 | 811 | out->print("class loader "PTR_FORMAT, this); |
coleenp@4037 | 812 | class_loader()->print_value_on(out); |
coleenp@4037 | 813 | } |
coleenp@4037 | 814 | } |
sla@5237 | 815 | |
sla@5237 | 816 | #if INCLUDE_TRACE |
sla@5237 | 817 | |
sla@5237 | 818 | TracingTime ClassLoaderDataGraph::_class_unload_time; |
sla@5237 | 819 | |
sla@5237 | 820 | void ClassLoaderDataGraph::class_unload_event(Klass* const k) { |
sla@5237 | 821 | |
sla@5237 | 822 | // post class unload event |
sla@5237 | 823 | EventClassUnload event(UNTIMED); |
sla@5237 | 824 | event.set_endtime(_class_unload_time); |
sla@5237 | 825 | event.set_unloadedClass(k); |
sla@5237 | 826 | oop defining_class_loader = k->class_loader(); |
sla@5237 | 827 | event.set_definingClassLoader(defining_class_loader != NULL ? |
sla@5237 | 828 | defining_class_loader->klass() : (Klass*)NULL); |
sla@5237 | 829 | event.commit(); |
sla@5237 | 830 | } |
sla@5237 | 831 | |
sla@5237 | 832 | #endif /* INCLUDE_TRACE */ |