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src/hotspot/share/classfile/classLoaderData.cpp
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*** 45,56 ****
//
// 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/dictionary.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/metadataOnStackMark.hpp"
#include "classfile/moduleEntry.hpp"
#include "classfile/packageEntry.hpp"
--- 45,56 ----
//
// The bootstrap loader (represented by NULL) also has a ClassLoaderData,
// the singleton class the_null_class_loader_data().
#include "precompiled.hpp"
#include "classfile/classLoaderData.inline.hpp"
+ #include "classfile/classLoaderDataGraph.inline.hpp"
#include "classfile/dictionary.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/metadataOnStackMark.hpp"
#include "classfile/moduleEntry.hpp"
#include "classfile/packageEntry.hpp"
*** 60,87 ****
#include "logging/logStream.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/metadataFactory.hpp"
#include "memory/metaspaceShared.hpp"
#include "memory/resourceArea.hpp"
- #include "memory/universe.hpp"
#include "oops/access.inline.hpp"
#include "oops/oop.inline.hpp"
#include "oops/oopHandle.inline.hpp"
#include "oops/weakHandle.inline.hpp"
#include "runtime/atomic.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/mutex.hpp"
#include "runtime/orderAccess.hpp"
#include "runtime/safepoint.hpp"
- #include "runtime/safepointVerifiers.hpp"
#include "utilities/growableArray.hpp"
#include "utilities/macros.hpp"
#include "utilities/ostream.hpp"
- volatile size_t ClassLoaderDataGraph::_num_array_classes = 0;
- volatile size_t ClassLoaderDataGraph::_num_instance_classes = 0;
-
ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL;
void ClassLoaderData::init_null_class_loader_data() {
assert(_the_null_class_loader_data == NULL, "cannot initialize twice");
assert(ClassLoaderDataGraph::_head == NULL, "cannot initialize twice");
--- 60,82 ----
*** 442,458 ****
// Added a potentially young gen oop to the ClassLoaderData
record_modified_oops();
}
}
-
- void ClassLoaderDataGraph::clear_claimed_marks() {
- for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
- cld->clear_claimed();
- }
- }
-
void ClassLoaderData::add_class(Klass* k, bool publicize /* true */) {
{
MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
Klass* old_value = _klasses;
k->set_next_link(old_value);
--- 437,446 ----
*** 476,557 ****
ls.cr();
}
}
}
- // Class iterator used by the compiler. It gets some number of classes at
- // a safepoint to decay invocation counters on the methods.
- class ClassLoaderDataGraphKlassIteratorStatic {
- ClassLoaderData* _current_loader_data;
- Klass* _current_class_entry;
- public:
-
- ClassLoaderDataGraphKlassIteratorStatic() : _current_loader_data(NULL), _current_class_entry(NULL) {}
-
- InstanceKlass* try_get_next_class() {
- assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
- size_t max_classes = ClassLoaderDataGraph::num_instance_classes();
- assert(max_classes > 0, "should not be called with no instance classes");
- for (size_t i = 0; i < max_classes; ) {
-
- if (_current_class_entry != NULL) {
- Klass* k = _current_class_entry;
- _current_class_entry = _current_class_entry->next_link();
-
- if (k->is_instance_klass()) {
- InstanceKlass* ik = InstanceKlass::cast(k);
- i++; // count all instance classes found
- // Not yet loaded classes are counted in max_classes
- // but only return loaded classes.
- if (ik->is_loaded()) {
- return ik;
- }
- }
- } else {
- // Go to next CLD
- if (_current_loader_data != NULL) {
- _current_loader_data = _current_loader_data->next();
- }
- // Start at the beginning
- if (_current_loader_data == NULL) {
- _current_loader_data = ClassLoaderDataGraph::_head;
- }
-
- _current_class_entry = _current_loader_data->klasses();
- }
- }
- // Should never be reached unless all instance classes have failed or are not fully loaded.
- // Caller handles NULL.
- return NULL;
- }
-
- // If the current class for the static iterator is a class being unloaded or
- // deallocated, adjust the current class.
- void adjust_saved_class(ClassLoaderData* cld) {
- if (_current_loader_data == cld) {
- _current_loader_data = cld->next();
- if (_current_loader_data != NULL) {
- _current_class_entry = _current_loader_data->klasses();
- } // else try_get_next_class will start at the head
- }
- }
-
- void adjust_saved_class(Klass* klass) {
- if (_current_class_entry == klass) {
- _current_class_entry = klass->next_link();
- }
- }
- };
-
- static ClassLoaderDataGraphKlassIteratorStatic static_klass_iterator;
-
- InstanceKlass* ClassLoaderDataGraph::try_get_next_class() {
- assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
- return static_klass_iterator.try_get_next_class();
- }
-
-
void ClassLoaderData::initialize_holder(Handle loader_or_mirror) {
if (loader_or_mirror() != NULL) {
assert(_holder.is_null(), "never replace holders");
_holder = WeakHandle<vm_class_loader_data>::create(loader_or_mirror);
}
--- 464,473 ----
*** 561,571 ****
// or parsed class in the case of an error.
void ClassLoaderData::remove_class(Klass* scratch_class) {
assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
// Adjust global class iterator.
! static_klass_iterator.adjust_saved_class(scratch_class);
Klass* prev = NULL;
for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
if (k == scratch_class) {
if (prev == NULL) {
--- 477,487 ----
// or parsed class in the case of an error.
void ClassLoaderData::remove_class(Klass* scratch_class) {
assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
// Adjust global class iterator.
! ClassLoaderDataGraph::adjust_saved_class(scratch_class);
Klass* prev = NULL;
for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
if (k == scratch_class) {
if (prev == NULL) {
*** 609,619 ****
// these classes are unloading. Must be called
// after erroneous classes are released.
classes_do(InstanceKlass::unload_class);
// Clean up global class iterator for compiler
! static_klass_iterator.adjust_saved_class(this);
}
ModuleEntryTable* ClassLoaderData::modules() {
// Lazily create the module entry table at first request.
// Lock-free access requires load_acquire.
--- 525,535 ----
// these classes are unloading. Must be called
// after erroneous classes are released.
classes_do(InstanceKlass::unload_class);
// Clean up global class iterator for compiler
! ClassLoaderDataGraph::adjust_saved_class(this);
}
ModuleEntryTable* ClassLoaderData::modules() {
// Lazily create the module entry table at first request.
// Lock-free access requires load_acquire.
*** 912,956 ****
ClassLoaderDataGraph::set_should_clean_deallocate_lists();
}
}
}
- void ClassLoaderDataGraph::clean_deallocate_lists(bool walk_previous_versions) {
- assert(SafepointSynchronize::is_at_safepoint(), "must only be called at safepoint");
- uint loaders_processed = 0;
- for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
- // is_alive check will be necessary for concurrent class unloading.
- if (cld->is_alive()) {
- // clean metaspace
- if (walk_previous_versions) {
- cld->classes_do(InstanceKlass::purge_previous_versions);
- }
- cld->free_deallocate_list();
- loaders_processed++;
- }
- }
- log_debug(class, loader, data)("clean_deallocate_lists: loaders processed %u %s",
- loaders_processed, walk_previous_versions ? "walk_previous_versions" : "");
- }
-
- void ClassLoaderDataGraph::walk_metadata_and_clean_metaspaces() {
- assert(SafepointSynchronize::is_at_safepoint(), "must only be called at safepoint");
-
- _should_clean_deallocate_lists = false; // assume everything gets cleaned
-
- // Mark metadata seen on the stack so we can delete unreferenced entries.
- // Walk all metadata, including the expensive code cache walk, only for class redefinition.
- // The MetadataOnStackMark walk during redefinition saves previous versions if it finds old methods
- // on the stack or in the code cache, so we only have to repeat the full walk if
- // they were found at that time.
- // TODO: have redefinition clean old methods out of the code cache. They still exist in some places.
- bool walk_all_metadata = InstanceKlass::has_previous_versions_and_reset();
-
- MetadataOnStackMark md_on_stack(walk_all_metadata);
- clean_deallocate_lists(walk_all_metadata);
- }
-
// This is distinct from free_deallocate_list. For class loader data that are
// unloading, this frees the C heap memory for items on the list, and unlinks
// scratch or error classes so that unloading events aren't triggered for these
// classes. The metadata is removed with the unloading metaspace.
// There isn't C heap memory allocated for methods, so nothing is done for them.
--- 828,837 ----
*** 1068,1592 ****
for (Klass* k = OrderAccess::load_acquire(&_klasses); k != NULL; k = k->next_link()) {
if (k == klass) return true;
}
return false;
}
-
-
- // GC root of class loader data created.
- ClassLoaderData* ClassLoaderDataGraph::_head = NULL;
- ClassLoaderData* ClassLoaderDataGraph::_unloading = NULL;
- ClassLoaderData* ClassLoaderDataGraph::_saved_unloading = NULL;
- ClassLoaderData* ClassLoaderDataGraph::_saved_head = NULL;
-
- bool ClassLoaderDataGraph::_should_purge = false;
- bool ClassLoaderDataGraph::_should_clean_deallocate_lists = false;
- bool ClassLoaderDataGraph::_safepoint_cleanup_needed = false;
- bool ClassLoaderDataGraph::_metaspace_oom = false;
-
- // 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_to_graph(Handle loader, bool is_unsafe_anonymous) {
-
- assert_lock_strong(ClassLoaderDataGraph_lock);
-
- ClassLoaderData* cld;
-
- // First check if another thread beat us to creating the CLD and installing
- // it into the loader while we were waiting for the lock.
- if (!is_unsafe_anonymous && loader.not_null()) {
- cld = java_lang_ClassLoader::loader_data_acquire(loader());
- if (cld != NULL) {
- return cld;
- }
- }
-
- // We mustn't GC until we've installed the ClassLoaderData in the Graph since the CLD
- // contains oops in _handles that must be walked. GC doesn't walk CLD from the
- // loader oop in all collections, particularly young collections.
- NoSafepointVerifier no_safepoints;
-
- cld = new ClassLoaderData(loader, is_unsafe_anonymous);
-
- // First install the new CLD to the Graph.
- cld->set_next(_head);
- _head = cld;
-
- // Next associate with the class_loader.
- if (!is_unsafe_anonymous) {
- // Use OrderAccess, since readers need to get the loader_data only after
- // it's added to the Graph
- java_lang_ClassLoader::release_set_loader_data(loader(), cld);
- }
-
- // Lastly log, if requested
- LogTarget(Trace, class, loader, data) lt;
- if (lt.is_enabled()) {
- ResourceMark rm;
- LogStream ls(lt);
- ls.print("create ");
- cld->print_value_on(&ls);
- ls.cr();
- }
- return cld;
- }
-
- ClassLoaderData* ClassLoaderDataGraph::add(Handle loader, bool is_unsafe_anonymous) {
- MutexLocker ml(ClassLoaderDataGraph_lock);
- ClassLoaderData* loader_data = add_to_graph(loader, is_unsafe_anonymous);
- return loader_data;
- }
-
- void ClassLoaderDataGraph::cld_do(CLDClosure* cl) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->_next) {
- cl->do_cld(cld);
- }
- }
-
- void ClassLoaderDataGraph::cld_unloading_do(CLDClosure* cl) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- // Only walk the head until any clds not purged from prior unloading
- // (CMS doesn't purge right away).
- for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
- assert(cld->is_unloading(), "invariant");
- cl->do_cld(cld);
- }
- }
-
- void ClassLoaderDataGraph::roots_cld_do(CLDClosure* strong, CLDClosure* weak) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->_next) {
- CLDClosure* closure = cld->keep_alive() ? strong : weak;
- if (closure != NULL) {
- closure->do_cld(cld);
- }
- }
- }
-
- void ClassLoaderDataGraph::always_strong_cld_do(CLDClosure* cl) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- if (ClassUnloading) {
- roots_cld_do(cl, NULL);
- } else {
- cld_do(cl);
- }
- }
-
- // Closure for locking and iterating through classes.
- LockedClassesDo::LockedClassesDo(classes_do_func_t f) : _function(f) {
- ClassLoaderDataGraph_lock->lock();
- }
-
- LockedClassesDo::LockedClassesDo() : _function(NULL) {
- // callers provide their own do_klass
- ClassLoaderDataGraph_lock->lock();
- }
-
- LockedClassesDo::~LockedClassesDo() { ClassLoaderDataGraph_lock->unlock(); }
-
-
- // Iterating over the CLDG needs to be locked because
- // unloading can remove entries concurrently soon.
- class ClassLoaderDataGraphIterator : public StackObj {
- ClassLoaderData* _next;
- HandleMark _hm; // clean up handles when this is done.
- Handle _holder;
- Thread* _thread;
-
- void hold_next() {
- if (_next != NULL) {
- _holder = Handle(_thread, _next->holder_phantom());
- }
- }
- public:
- ClassLoaderDataGraphIterator() : _next(ClassLoaderDataGraph::_head) {
- _thread = Thread::current();
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- hold_next();
- }
-
- bool repeat() const {
- return _next != NULL;
- }
-
- ClassLoaderData* get_next() {
- ClassLoaderData* next = _next;
- if (_next != NULL) {
- _next = _next->next();
- hold_next();
- }
- return next;
- }
- };
-
- // These functions assume that the caller has locked the ClassLoaderDataGraph_lock
- // if they are not calling the function from a safepoint.
- void ClassLoaderDataGraph::classes_do(KlassClosure* klass_closure) {
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->classes_do(klass_closure);
- }
- }
-
- void ClassLoaderDataGraph::classes_do(void f(Klass* const)) {
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->classes_do(f);
- }
- }
-
- void ClassLoaderDataGraph::methods_do(void f(Method*)) {
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->methods_do(f);
- }
- }
-
- void ClassLoaderDataGraph::modules_do(void f(ModuleEntry*)) {
- assert_locked_or_safepoint(Module_lock);
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->modules_do(f);
- }
- }
-
- void ClassLoaderDataGraph::modules_unloading_do(void f(ModuleEntry*)) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- // Only walk the head until any clds not purged from prior unloading
- // (CMS doesn't purge right away).
- for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
- assert(cld->is_unloading(), "invariant");
- cld->modules_do(f);
- }
- }
-
- void ClassLoaderDataGraph::packages_do(void f(PackageEntry*)) {
- assert_locked_or_safepoint(Module_lock);
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->packages_do(f);
- }
- }
-
- void ClassLoaderDataGraph::packages_unloading_do(void f(PackageEntry*)) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- // Only walk the head until any clds not purged from prior unloading
- // (CMS doesn't purge right away).
- for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
- assert(cld->is_unloading(), "invariant");
- cld->packages_do(f);
- }
- }
-
- void ClassLoaderDataGraph::loaded_classes_do(KlassClosure* klass_closure) {
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->loaded_classes_do(klass_closure);
- }
- }
-
- // This case can block but cannot do unloading (called from CDS)
- void ClassLoaderDataGraph::unlocked_loaded_classes_do(KlassClosure* klass_closure) {
- for (ClassLoaderData* cld = _head; cld != NULL; cld = cld->next()) {
- cld->loaded_classes_do(klass_closure);
- }
- }
-
-
- void ClassLoaderDataGraph::classes_unloading_do(void f(Klass* const)) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- // Only walk the head until any clds not purged from prior unloading
- // (CMS doesn't purge right away).
- for (ClassLoaderData* cld = _unloading; cld != _saved_unloading; cld = cld->next()) {
- assert(cld->is_unloading(), "invariant");
- cld->classes_do(f);
- }
- }
-
- #define FOR_ALL_DICTIONARY(X) ClassLoaderDataGraphIterator iter; \
- ClassLoaderData* X; \
- while ((X = iter.get_next()) != NULL) \
- if (X->dictionary() != NULL)
-
- // Walk classes in the loaded class dictionaries in various forms.
- // Only walks the classes defined in this class loader.
- void ClassLoaderDataGraph::dictionary_classes_do(void f(InstanceKlass*)) {
- FOR_ALL_DICTIONARY(cld) {
- cld->dictionary()->classes_do(f);
- }
- }
-
- // Only walks the classes defined in this class loader.
- void ClassLoaderDataGraph::dictionary_classes_do(void f(InstanceKlass*, TRAPS), TRAPS) {
- FOR_ALL_DICTIONARY(cld) {
- cld->dictionary()->classes_do(f, CHECK);
- }
- }
-
- void ClassLoaderDataGraph::verify_dictionary() {
- FOR_ALL_DICTIONARY(cld) {
- cld->dictionary()->verify();
- }
- }
-
- void ClassLoaderDataGraph::print_dictionary(outputStream* st) {
- FOR_ALL_DICTIONARY(cld) {
- st->print("Dictionary for ");
- cld->print_value_on(st);
- st->cr();
- cld->dictionary()->print_on(st);
- st->cr();
- }
- }
-
- void ClassLoaderDataGraph::print_dictionary_statistics(outputStream* st) {
- FOR_ALL_DICTIONARY(cld) {
- ResourceMark rm;
- stringStream tempst;
- tempst.print("System Dictionary for %s class loader", cld->loader_name_and_id());
- cld->dictionary()->print_table_statistics(st, tempst.as_string());
- }
- }
-
- GrowableArray<ClassLoaderData*>* ClassLoaderDataGraph::new_clds() {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- 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);
- LogTarget(Debug, class, loader, data) lt;
- if (lt.is_enabled()) {
- LogStream ls(lt);
- ls.print("found new CLD: ");
- curr->print_value_on(&ls);
- ls.cr();
- }
- }
-
- curr = curr->_next;
- }
-
- return array;
- }
-
- #ifndef PRODUCT
- bool ClassLoaderDataGraph::contains_loader_data(ClassLoaderData* loader_data) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
- 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(bool do_cleaning) {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
-
- // Indicate whether safepoint cleanup is needed.
- _safepoint_cleanup_needed |= do_cleaning;
-
- ClassLoaderData* data = _head;
- ClassLoaderData* prev = NULL;
- bool seen_dead_loader = false;
- uint loaders_processed = 0;
- uint loaders_removed = 0;
-
- // Save previous _unloading pointer for CMS which may add to unloading list before
- // purging and we don't want to rewalk the previously unloaded class loader data.
- _saved_unloading = _unloading;
-
- data = _head;
- while (data != NULL) {
- if (data->is_alive()) {
- prev = data;
- data = data->next();
- loaders_processed++;
- continue;
- }
- seen_dead_loader = true;
- loaders_removed++;
- ClassLoaderData* dead = data;
- dead->unload();
- data = data->next();
- // Remove from loader list.
- // This class loader data will no longer be found
- // in the ClassLoaderDataGraph.
- if (prev != NULL) {
- prev->set_next(data);
- } else {
- assert(dead == _head, "sanity check");
- _head = data;
- }
- dead->set_next(_unloading);
- _unloading = dead;
- }
-
- log_debug(class, loader, data)("do_unloading: loaders processed %u, loaders removed %u", loaders_processed, loaders_removed);
-
- return seen_dead_loader;
- }
-
- // There's at least one dead class loader. Purge refererences of healthy module
- // reads lists and package export lists to modules belonging to dead loaders.
- void ClassLoaderDataGraph::clean_module_and_package_info() {
- assert_locked_or_safepoint(ClassLoaderDataGraph_lock);
-
- ClassLoaderData* data = _head;
- while (data != NULL) {
- // Remove entries in the dictionary of live class loader that have
- // initiated loading classes in a dead class loader.
- if (data->dictionary() != NULL) {
- data->dictionary()->do_unloading();
- }
- // Walk a ModuleEntry's reads, and a PackageEntry's exports
- // lists to determine if there are modules on those lists that are now
- // dead and should be removed. A module's life cycle is equivalent
- // to its defining class loader's life cycle. Since a module is
- // considered dead if its class loader is dead, these walks must
- // occur after each class loader's aliveness is determined.
- if (data->packages() != NULL) {
- data->packages()->purge_all_package_exports();
- }
- if (data->modules_defined()) {
- data->modules()->purge_all_module_reads();
- }
- data = data->next();
- }
- }
-
- void ClassLoaderDataGraph::purge() {
- assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
- ClassLoaderData* list = _unloading;
- _unloading = NULL;
- ClassLoaderData* next = list;
- bool classes_unloaded = false;
- while (next != NULL) {
- ClassLoaderData* purge_me = next;
- next = purge_me->next();
- delete purge_me;
- classes_unloaded = true;
- }
- if (classes_unloaded) {
- Metaspace::purge();
- set_metaspace_oom(false);
- }
- }
-
- int ClassLoaderDataGraph::resize_if_needed() {
- assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
- int resized = 0;
- if (Dictionary::does_any_dictionary_needs_resizing()) {
- FOR_ALL_DICTIONARY(cld) {
- if (cld->dictionary()->resize_if_needed()) {
- resized++;
- }
- }
- }
- return resized;
- }
-
- ClassLoaderDataGraphKlassIteratorAtomic::ClassLoaderDataGraphKlassIteratorAtomic()
- : _next_klass(NULL) {
- assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
- ClassLoaderData* cld = ClassLoaderDataGraph::_head;
- Klass* klass = NULL;
-
- // Find the first klass in the CLDG.
- while (cld != NULL) {
- assert_locked_or_safepoint(cld->metaspace_lock());
- klass = cld->_klasses;
- if (klass != NULL) {
- _next_klass = klass;
- return;
- }
- cld = cld->next();
- }
- }
-
- Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass_in_cldg(Klass* klass) {
- Klass* next = klass->next_link();
- if (next != NULL) {
- return next;
- }
-
- // No more klasses in the current CLD. Time to find a new CLD.
- ClassLoaderData* cld = klass->class_loader_data();
- assert_locked_or_safepoint(cld->metaspace_lock());
- while (next == NULL) {
- cld = cld->next();
- if (cld == NULL) {
- break;
- }
- next = cld->_klasses;
- }
-
- return next;
- }
-
- Klass* ClassLoaderDataGraphKlassIteratorAtomic::next_klass() {
- Klass* head = _next_klass;
-
- while (head != NULL) {
- Klass* next = next_klass_in_cldg(head);
-
- Klass* old_head = Atomic::cmpxchg(next, &_next_klass, head);
-
- if (old_head == head) {
- return head; // Won the CAS.
- }
-
- head = old_head;
- }
-
- // Nothing more for the iterator to hand out.
- assert(head == NULL, "head is " PTR_FORMAT ", expected not null:", p2i(head));
- return NULL;
- }
-
- ClassLoaderDataGraphMetaspaceIterator::ClassLoaderDataGraphMetaspaceIterator() {
- assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint!");
- _data = ClassLoaderDataGraph::_head;
- }
-
- ClassLoaderDataGraphMetaspaceIterator::~ClassLoaderDataGraphMetaspaceIterator() {}
-
- #ifndef PRODUCT
- // callable from debugger
- extern "C" int print_loader_data_graph() {
- ResourceMark rm;
- ClassLoaderDataGraph::print_on(tty);
- return 0;
- }
-
- void ClassLoaderDataGraph::verify() {
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->verify();
- }
- }
-
- void ClassLoaderDataGraph::print_on(outputStream * const out) {
- ClassLoaderDataGraphIterator iter;
- while (iter.repeat()) {
- ClassLoaderData* cld = iter.get_next();
- cld->print_on(out);
- }
- }
- #endif // PRODUCT
--- 949,953 ----
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