--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/classfile/classLoaderData.cpp Sat Sep 01 13:25:18 2012 -0400
@@ -0,0 +1,640 @@
+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+// A ClassLoaderData identifies the full set of class types that a class
+// loader's name resolution strategy produces for a given configuration of the
+// class loader.
+// Class types in the ClassLoaderData may be defined by from class file binaries
+// provided by the class loader, or from other class loader it interacts with
+// according to its name resolution strategy.
+//
+// Class loaders that implement a deterministic name resolution strategy
+// (including with respect to their delegation behavior), such as the boot, the
+// extension, and the system loaders of the JDK's built-in class loader
+// hierarchy, always produce the same linkset for a given configuration.
+//
+// ClassLoaderData carries information related to a linkset (e.g.,
+// metaspace holding its klass definitions).
+// The System Dictionary and related data structures (e.g., placeholder table,
+// loader constraints table) as well as the runtime representation of classes
+// only reference ClassLoaderData.
+//
+// Instances of java.lang.ClassLoader holds a pointer to a ClassLoaderData that
+// that represent the loader's "linking domain" in the JVM.
+//
+// The bootstrap loader (represented by NULL) also has a ClassLoaderData,
+// the singleton class the_null_class_loader_data().
+
+#include "precompiled.hpp"
+#include "classfile/classLoaderData.hpp"
+#include "classfile/classLoaderData.inline.hpp"
+#include "classfile/javaClasses.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "code/codeCache.hpp"
+#include "memory/metadataFactory.hpp"
+#include "memory/metaspaceShared.hpp"
+#include "prims/jvmtiRedefineClasses.hpp"
+#include "runtime/jniHandles.hpp"
+#include "runtime/mutex.hpp"
+#include "runtime/safepoint.hpp"
+#include "runtime/synchronizer.hpp"
+#include "utilities/growableArray.hpp"
+#include "utilities/ostream.hpp"
+
+ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL;
+
+ClassLoaderData::ClassLoaderData(Handle h_class_loader) : _class_loader(h_class_loader()),
+ _metaspace(NULL), _unloading(false), _klasses(NULL),
+ _claimed(0), _jmethod_ids(NULL), _handles(NULL),
+ _deallocate_list(NULL), _next(NULL),
+ _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) {
+ // empty
+}
+
+bool ClassLoaderData::claim() {
+ if (_claimed == 1) {
+ return false;
+ }
+
+ return (int) Atomic::cmpxchg(1, &_claimed, 0) == 0;
+}
+
+void ClassLoaderData::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
+ if (must_claim && !claim()) {
+ return;
+ }
+
+ f->do_oop(&_class_loader);
+ _handles->oops_do(f);
+ if (klass_closure != NULL) {
+ classes_do(klass_closure);
+ }
+}
+
+void ClassLoaderData::classes_do(KlassClosure* klass_closure) {
+ for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
+ klass_closure->do_klass(k);
+ }
+}
+
+void ClassLoaderData::classes_do(void f(InstanceKlass*)) {
+ for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
+ if (k->oop_is_instance()) {
+ f(InstanceKlass::cast(k));
+ }
+ }
+}
+
+void ClassLoaderData::record_dependency(Klass* k, TRAPS) {
+ ClassLoaderData * const from_cld = this;
+ ClassLoaderData * const to_cld = k->class_loader_data();
+
+ // Records dependency between non-null class loaders only.
+ if (to_cld->is_the_null_class_loader_data() || from_cld->is_the_null_class_loader_data()) {
+ return;
+ }
+
+ // Check that this dependency isn't from the same or parent class_loader
+ oop to = to_cld->class_loader();
+ oop from = from_cld->class_loader();
+
+ oop curr = from;
+ while (curr != NULL) {
+ if (curr == to) {
+ return; // this class loader is in the parent list, no need to add it.
+ }
+ curr = java_lang_ClassLoader::parent(curr);
+ }
+
+ // It's a dependency we won't find through GC, add it. This is relatively rare
+ from_cld->add_dependency(to_cld, CHECK);
+}
+
+bool ClassLoaderData::has_dependency(ClassLoaderData* dependency) {
+ oop loader = dependency->class_loader();
+
+ // Get objArrayOop out of the class_loader oop and see if this dependency
+ // is there. Don't safepoint! These are all oops.
+ // Dependency list is (oop class_loader, objArrayOop next)
+ objArrayOop ok = (objArrayOop)java_lang_ClassLoader::dependencies(class_loader());
+ while (ok != NULL) {
+ if (ok->obj_at(0) == loader) {
+ return true;
+ }
+ ok = (objArrayOop)ok->obj_at(1);
+ }
+ return false;
+}
+
+void ClassLoaderData::add_dependency(ClassLoaderData* dependency, TRAPS) {
+ // Minimize the number of duplicates in the list.
+ if (has_dependency(dependency)) {
+ return;
+ }
+
+ // Create a new dependency node with fields for (class_loader, next)
+ objArrayOop deps = oopFactory::new_objectArray(2, CHECK);
+ deps->obj_at_put(0, dependency->class_loader());
+
+ // Add this lock free, using compare and exchange, need barriers for GC
+ // Do the barrier first.
+ HeapWord* addr = java_lang_ClassLoader::dependencies_addr(class_loader());
+ while (true) {
+ oop old_dependency = java_lang_ClassLoader::dependencies(class_loader());
+ deps->obj_at_put(1, old_dependency);
+
+ oop newold = oopDesc::atomic_compare_exchange_oop((oop)deps, addr, old_dependency, true);
+ if (newold == old_dependency) {
+ update_barrier_set((void*)addr, (oop)deps);
+ // we won the race to add this dependency
+ break;
+ }
+ }
+}
+
+
+void ClassLoaderDataGraph::clear_claimed_marks() {
+ for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
+ cld->clear_claimed();
+ }
+}
+
+void ClassLoaderData::add_class(Klass* k) {
+ MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
+ Klass* old_value = _klasses;
+ k->set_next_link(old_value);
+ // link the new item into the list
+ _klasses = k;
+
+ if (TraceClassLoaderData && k->class_loader_data() != NULL) {
+ ResourceMark rm;
+ tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: "
+ PTR_FORMAT " loader: " PTR_FORMAT " %s",
+ k,
+ k->external_name(),
+ k->class_loader_data(),
+ k->class_loader(),
+ k->class_loader() != NULL ? k->class_loader()->klass()->external_name() : "NULL"
+ );
+ }
+}
+
+// This is called by InstanceKlass::deallocate_contents() to remove the
+// scratch_class for redefine classes. We need a lock because there it may not
+// be called at a safepoint if there's an error.
+void ClassLoaderData::remove_class(Klass* scratch_class) {
+ MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
+ Klass* prev = NULL;
+ for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
+ if (k == scratch_class) {
+ if (prev == NULL) {
+ _klasses = k->next_link();
+ } else {
+ Klass* next = k->next_link();
+ prev->set_next_link(next);
+ }
+ return;
+ }
+ prev = k;
+ }
+ ShouldNotReachHere(); // should have found this class!!
+}
+
+ClassLoaderData::~ClassLoaderData() {
+ Metaspace *m = _metaspace;
+ if (m != NULL) {
+ _metaspace = NULL;
+ // release the metaspace
+ delete m;
+ // release the handles
+ if (_handles != NULL) {
+ JNIHandleBlock::release_block(_handles);
+ _handles = NULL;
+ }
+ }
+
+ // Clear all the JNI handles for methods
+ // These aren't deallocated and are going to look like a leak, but that's
+ // needed because we can't really get rid of jmethodIDs because we don't
+ // know when native code is going to stop using them. The spec says that
+ // they're "invalid" but existing programs likely rely on their being
+ // NULL after class unloading.
+ if (_jmethod_ids != NULL) {
+ Method::clear_jmethod_ids(this);
+ }
+ // Delete lock
+ delete _metaspace_lock;
+
+ // Delete free list
+ if (_deallocate_list != NULL) {
+ delete _deallocate_list;
+ }
+}
+
+Metaspace* ClassLoaderData::metaspace_non_null() {
+ // If the metaspace has not been allocated, create a new one. Might want
+ // to create smaller arena for Reflection class loaders also.
+ // The reason for the delayed allocation is because some class loaders are
+ // simply for delegating with no metadata of their own.
+ if (_metaspace == NULL) {
+ MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
+ // Check again if metaspace has been allocated while we were getting this lock.
+ if (_metaspace != NULL) {
+ return _metaspace;
+ }
+ if (class_loader() == NULL) {
+ assert(this == the_null_class_loader_data(), "Must be");
+ size_t word_size = Metaspace::first_chunk_word_size();
+ set_metaspace(new Metaspace(_metaspace_lock, word_size));
+ } else {
+ set_metaspace(new Metaspace(_metaspace_lock)); // default size for now.
+ }
+ }
+ return _metaspace;
+}
+
+JNIHandleBlock* ClassLoaderData::handles() const { return _handles; }
+void ClassLoaderData::set_handles(JNIHandleBlock* handles) { _handles = handles; }
+
+jobject ClassLoaderData::add_handle(Handle h) {
+ MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
+ if (handles() == NULL) {
+ set_handles(JNIHandleBlock::allocate_block());
+ }
+ return handles()->allocate_handle(h());
+}
+
+// Add this metadata pointer to be freed when it's safe. This is only during
+// class unloading because Handles might point to this metadata field.
+void ClassLoaderData::add_to_deallocate_list(Metadata* m) {
+ // Metadata in shared region isn't deleted.
+ if (!m->is_shared()) {
+ MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
+ if (_deallocate_list == NULL) {
+ _deallocate_list = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(100, true);
+ }
+ _deallocate_list->append_if_missing(m);
+ }
+}
+
+// Deallocate free metadata on the free list. How useful the PermGen was!
+void ClassLoaderData::free_deallocate_list() {
+ // Don't need lock, at safepoint
+ assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
+ if (_deallocate_list == NULL) {
+ return;
+ }
+ // Go backwards because this removes entries that are freed.
+ for (int i = _deallocate_list->length() - 1; i >= 0; i--) {
+ Metadata* m = _deallocate_list->at(i);
+ if (!m->on_stack()) {
+ _deallocate_list->remove_at(i);
+ // There are only three types of metadata that we deallocate directly.
+ // Cast them so they can be used by the template function.
+ if (m->is_method()) {
+ MetadataFactory::free_metadata(this, (Method*)m);
+ } else if (m->is_constantPool()) {
+ MetadataFactory::free_metadata(this, (ConstantPool*)m);
+ } else if (m->is_klass()) {
+ MetadataFactory::free_metadata(this, (InstanceKlass*)m);
+ } else {
+ ShouldNotReachHere();
+ }
+ }
+ }
+}
+
+#ifndef PRODUCT
+void ClassLoaderData::print_loader(ClassLoaderData *loader_data, outputStream* out) {
+ oop class_loader = loader_data->class_loader();
+ out->print("%s", SystemDictionary::loader_name(class_loader));
+}
+
+// Define to dump klasses
+#undef CLD_DUMP_KLASSES
+
+void ClassLoaderData::dump(outputStream * const out) {
+ ResourceMark rm;
+ out->print("ClassLoaderData CLD: "PTR_FORMAT", loader: "PTR_FORMAT", loader_klass: "PTR_FORMAT" %s {",
+ this, class_loader(),
+ class_loader() != NULL ? class_loader()->klass() : NULL,
+ class_loader() != NULL ? class_loader()->klass()->external_name() : "NULL");
+ if (claimed()) out->print(" claimed ");
+ if (is_unloading()) out->print(" unloading ");
+ out->print(" handles " INTPTR_FORMAT, handles());
+ out->cr();
+ if (metaspace_or_null() != NULL) {
+ out->print_cr("metaspace: " PTR_FORMAT, metaspace_or_null());
+ metaspace_or_null()->dump(out);
+ } else {
+ out->print_cr("metaspace: NULL");
+ }
+
+#ifdef CLD_DUMP_KLASSES
+ if (Verbose) {
+ ResourceMark rm;
+ Klass* k = _klasses;
+ while (k != NULL) {
+ out->print_cr("klass "PTR_FORMAT", %s, CT: %d, MUT: %d", k, k->name()->as_C_string(),
+ k->has_modified_oops(), k->has_accumulated_modified_oops());
+ k = k->next_link();
+ }
+ }
+#endif // CLD_DUMP_KLASSES
+#undef CLD_DUMP_KLASSES
+ if (_jmethod_ids != NULL) {
+ Method::print_jmethod_ids(this, out);
+ }
+ out->print_cr("}");
+}
+#endif // PRODUCT
+
+void ClassLoaderData::verify() {
+ oop cl = class_loader();
+
+ guarantee(this == class_loader_data(cl), "Must be the same");
+ guarantee(cl != NULL || this == ClassLoaderData::the_null_class_loader_data(), "must be");
+
+ // Verify the integrity of the allocated space.
+ if (metaspace_or_null() != NULL) {
+ metaspace_or_null()->verify();
+ }
+
+ for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
+ guarantee(k->class_loader_data() == this, "Must be the same");
+ k->verify();
+ }
+}
+
+// GC root of class loader data created.
+ClassLoaderData* ClassLoaderDataGraph::_head = NULL;
+ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL;
+ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL;
+
+
+// Add a new class loader data node to the list. Assign the newly created
+// ClassLoaderData into the java/lang/ClassLoader object as a hidden field
+ClassLoaderData* ClassLoaderDataGraph::add(ClassLoaderData** cld_addr, Handle loader_data) {
+ // Not assigned a class loader data yet.
+ // Create one.
+ ClassLoaderData* *list_head = &_head;
+ ClassLoaderData* next = _head;
+ ClassLoaderData* cld = new ClassLoaderData(loader_data);
+
+ // First, Atomically set it.
+ ClassLoaderData* old = (ClassLoaderData*) Atomic::cmpxchg_ptr(cld, cld_addr, NULL);
+ if (old != NULL) {
+ delete cld;
+ // Returns the data.
+ return old;
+ }
+
+ // We won the race, and therefore the task of adding the data to the list of
+ // class loader data
+ do {
+ cld->set_next(next);
+ ClassLoaderData* exchanged = (ClassLoaderData*)Atomic::cmpxchg_ptr(cld, list_head, next);
+ if (exchanged == next) {
+ if (TraceClassLoaderData) {
+ tty->print("[ClassLoaderData: ");
+ tty->print("create class loader data "PTR_FORMAT, cld);
+ tty->print(" for instance "PTR_FORMAT" of ", cld->class_loader());
+ loader_data->klass()->name()->print_symbol_on(tty);
+ tty->print_cr("]");
+ }
+ return cld;
+ }
+ next = exchanged;
+ } while (true);
+}
+
+void ClassLoaderDataGraph::oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
+ for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
+ cld->oops_do(f, klass_closure, must_claim);
+ }
+}
+
+void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
+ if (ClassUnloading) {
+ ClassLoaderData::the_null_class_loader_data()->oops_do(f, klass_closure, must_claim);
+ } else {
+ ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim);
+ }
+}
+
+void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
+ for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
+ cld->classes_do(klass_closure);
+ }
+}
+
+GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() {
+ assert(_head == NULL || _saved_head != NULL, "remember_new_clds(true) not called?");
+
+ GrowableArray<ClassLoaderData*>* array = new GrowableArray<ClassLoaderData*>();
+
+ // The CLDs in [_head, _saved_head] were all added during last call to remember_new_clds(true);
+ ClassLoaderData* curr = _head;
+ while (curr != _saved_head) {
+ if (!curr->claimed()) {
+ array->push(curr);
+
+ if (TraceClassLoaderData) {
+ tty->print("[ClassLoaderData] found new CLD: ");
+ curr->print_value_on(tty);
+ tty->cr();
+ }
+ }
+
+ curr = curr->_next;
+ }
+
+ return array;
+}
+
+#ifndef PRODUCT
+// for debugging and hsfind(x)
+bool ClassLoaderDataGraph::contains(address x) {
+ // I think we need the _metaspace_lock taken here because the class loader
+ // data graph could be changing while we are walking it (new entries added,
+ // new entries being unloaded, etc).
+ if (DumpSharedSpaces) {
+ // There are only two metaspaces to worry about.
+ ClassLoaderData* ncld = ClassLoaderData::the_null_class_loader_data();
+ return (ncld->ro_metaspace()->contains(x) || ncld->rw_metaspace()->contains(x));
+ }
+
+ if (UseSharedSpaces && MetaspaceShared::is_in_shared_space(x)) {
+ return true;
+ }
+
+ for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
+ if (cld->metaspace_or_null() != NULL && cld->metaspace_or_null()->contains(x)) {
+ return true;
+ }
+ }
+
+ // Could also be on an unloading list which is okay, ie. still allocated
+ // for a little while.
+ for (ClassLoaderData* ucld = _unloading; ucld != NULL; ucld = ucld->next()) {
+ if (ucld->metaspace_or_null() != NULL && ucld->metaspace_or_null()->contains(x)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) {
+ for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
+ if (loader_data == data) {
+ return true;
+ }
+ }
+
+ return false;
+}
+#endif // PRODUCT
+
+// Move class loader data from main list to the unloaded list for unloading
+// and deallocation later.
+bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive) {
+ ClassLoaderData* data = _head;
+ ClassLoaderData* prev = NULL;
+ bool seen_dead_loader = false;
+ // mark metadata seen on the stack and code cache so we can delete
+ // unneeded entries.
+ bool has_redefined_a_class = JvmtiExport::has_redefined_a_class();
+ MetadataOnStackMark md_on_stack;
+ while (data != NULL) {
+ if (data->class_loader() == NULL || is_alive->do_object_b(data->class_loader())) {
+ assert(data->claimed(), "class loader data must have been claimed");
+ if (has_redefined_a_class) {
+ data->classes_do(InstanceKlass::purge_previous_versions);
+ }
+ data->free_deallocate_list();
+ prev = data;
+ data = data->next();
+ continue;
+ }
+ seen_dead_loader = true;
+ ClassLoaderData* dead = data;
+ dead->mark_for_unload();
+ if (TraceClassLoaderData) {
+ tty->print("[ClassLoaderData: unload loader data "PTR_FORMAT, dead);
+ tty->print(" for instance "PTR_FORMAT" of ", dead->class_loader());
+ dead->class_loader()->klass()->name()->print_symbol_on(tty);
+ tty->print_cr("]");
+ }
+ data = data->next();
+ // Remove from loader list.
+ if (prev != NULL) {
+ prev->set_next(data);
+ } else {
+ assert(dead == _head, "sanity check");
+ _head = data;
+ }
+ dead->set_next(_unloading);
+ _unloading = dead;
+ }
+ return seen_dead_loader;
+}
+
+void ClassLoaderDataGraph::purge() {
+ ClassLoaderData* list = _unloading;
+ _unloading = NULL;
+ ClassLoaderData* next = list;
+ while (next != NULL) {
+ ClassLoaderData* purge_me = next;
+ next = purge_me->next();
+ delete purge_me;
+ }
+}
+
+// CDS support
+
+// Global metaspaces for writing information to the shared archive. When
+// application CDS is supported, we may need one per metaspace, so this
+// sort of looks like it.
+Metaspace* ClassLoaderData::_ro_metaspace = NULL;
+Metaspace* ClassLoaderData::_rw_metaspace = NULL;
+static bool _shared_metaspaces_initialized = false;
+
+// Initialize shared metaspaces (change to call from somewhere not lazily)
+void ClassLoaderData::initialize_shared_metaspaces() {
+ assert(DumpSharedSpaces, "only use this for dumping shared spaces");
+ assert(this == ClassLoaderData::the_null_class_loader_data(),
+ "only supported for null loader data for now");
+ assert (!_shared_metaspaces_initialized, "only initialize once");
+ MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
+ _ro_metaspace = new Metaspace(_metaspace_lock, SharedReadOnlySize/wordSize);
+ _rw_metaspace = new Metaspace(_metaspace_lock, SharedReadWriteSize/wordSize);
+ _shared_metaspaces_initialized = true;
+}
+
+Metaspace* ClassLoaderData::ro_metaspace() {
+ assert(_ro_metaspace != NULL, "should already be initialized");
+ return _ro_metaspace;
+}
+
+Metaspace* ClassLoaderData::rw_metaspace() {
+ assert(_rw_metaspace != NULL, "should already be initialized");
+ return _rw_metaspace;
+}
+
+
+ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() {
+ _data = ClassLoaderDataGraph::_head;
+}
+
+ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {}
+
+#ifndef PRODUCT
+// callable from debugger
+extern "C" int print_loader_data_graph() {
+ ClassLoaderDataGraph::dump_on(tty);
+ return 0;
+}
+
+void ClassLoaderDataGraph::verify() {
+ for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
+ data->verify();
+ }
+}
+
+void ClassLoaderDataGraph::dump_on(outputStream * const out) {
+ for (ClassLoaderData* data = _head; data != NULL; data = data->next()) {
+ data->dump(out);
+ }
+ MetaspaceAux::dump(out);
+}
+
+void ClassLoaderData::print_value_on(outputStream* out) const {
+ if (class_loader() == NULL) {
+ out->print_cr("NULL class_loader");
+ } else {
+ out->print("class loader "PTR_FORMAT, this);
+ class_loader()->print_value_on(out);
+ }
+}
+#endif // PRODUCT