Metaspace* ClassLoaderData::metaspace_non_null() {
assert(!DumpSharedSpaces, "wrong metaspace!");
// 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 (this == the_null_class_loader_data()) {
assert (class_loader() == NULL, "Must be");
set_metaspace(new Metaspace(_metaspace_lock, Metaspace::BootMetaspaceType));
} else if (is_anonymous()) {
if (TraceClassLoaderData && Verbose && class_loader() != NULL) {
tty->print_cr("is_anonymous: %s", class_loader()->klass()->internal_name());
}
set_metaspace(new Metaspace(_metaspace_lock, Metaspace::AnonymousMetaspaceType));
} else if (class_loader()->is_a(SystemDictionary::reflect_DelegatingClassLoader_klass())) {
if (TraceClassLoaderData && Verbose && class_loader() != NULL) {
tty->print_cr("is_reflection: %s", class_loader()->klass()->internal_name());
}
set_metaspace(new Metaspace(_metaspace_lock, Metaspace::ReflectionMetaspaceType));
} else {
set_metaspace(new Metaspace(_metaspace_lock, Metaspace::StandardMetaspaceType));
}
}
return _metaspace;
}
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());
}
// 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, Metaspace::ROMetaspaceType);
_rw_metaspace = new Metaspace(_metaspace_lock, Metaspace::ReadWriteMetaspaceType);
_shared_metaspaces_initialized = true;
}
// 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);
}
}
void ClassLoaderData::loaded_classes_do(KlassClosure* klass_closure) {
// Lock to avoid classes being modified/added/removed during iteration
MutexLockerEx ml(metaspace_lock(), Mutex::_no_safepoint_check_flag);
for (Klass* k = _klasses; k != NULL; k = k->next_link()) {
// Do not filter ArrayKlass oops here...
if (k->oop_is_array() || (k->oop_is_instance() && InstanceKlass::cast(k)->is_loaded())) {
klass_closure->do_klass(k);
}
}
}
// 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;
assert(k != k->next_link(), "no loops!");
}
ShouldNotReachHere(); // should have found this class!!
}
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 && Verbose && k->class_loader_data() != NULL) {
ResourceMark rm;
tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: "
PTR_FORMAT " loader: " PTR_FORMAT " %s",
p2i(k),
k->external_name(),
p2i(k->class_loader_data()),
p2i((void *)k->class_loader()),
loader_name());
}
}
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);
// Link the new item into the list, making sure the linked class is stable
// since the list can be walked without a lock
OrderAccess::release_store_ptr(&_klasses, k);
}
if (publicize && k->class_loader_data() != NULL) {
ResourceMark rm;
log_trace(class, loader, data)("Adding k: " PTR_FORMAT " %s to CLD: "
PTR_FORMAT " loader: " PTR_FORMAT " %s",
p2i(k),
k->external_name(),
p2i(k->class_loader_data()),
p2i((void *)k->class_loader()),
loader_name());
}
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);
// Make sure linked class is stable, since the class list is walked without a lock
OrderAccess::storestore();
// link the new item into the list
_klasses = k;
}
if (publicize && TraceClassLoaderData && Verbose && k->class_loader_data() != NULL) {
ResourceMark rm;
tty->print_cr("[TraceClassLoaderData] Adding k: " PTR_FORMAT " %s to CLD: "
PTR_FORMAT " loader: " PTR_FORMAT " %s",
p2i(k),
k->external_name(),
p2i(k->class_loader_data()),
p2i((void *)k->class_loader()),
loader_name());
}
}
