// Move class loader data from main list to the unloaded list for unloading
// and deallocation later.
bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure,
bool clean_previous_versions) {
ClassLoaderData* data = _head;
ClassLoaderData* prev = NULL;
bool seen_dead_loader = false;
// Mark metadata seen on the stack only so we can delete unneeded entries.
// Only walk all metadata, including the expensive code cache walk, for Full GC
// and only if class redefinition and if there's previous versions of
// Klasses to delete.
bool walk_all_metadata = clean_previous_versions &&
JvmtiExport::has_redefined_a_class() &&
InstanceKlass::has_previous_versions();
MetadataOnStackMark md_on_stack(walk_all_metadata);
// 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(is_alive_closure)) {
// clean metaspace
if (walk_all_metadata) {
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->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;
}
if (seen_dead_loader) {
post_class_unload_events();
}
return seen_dead_loader;
}
// Move class loader data from main list to the unloaded list for unloading
// and deallocation later.
bool ClassLoaderDataGraph::do_unloading(BoolObjectClosure* is_alive_closure) {
ClassLoaderData* data = _head;
ClassLoaderData* prev = NULL;
bool seen_dead_loader = false;
// 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;
// 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->is_alive(is_alive_closure)) {
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->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;
}
if (seen_dead_loader) {
post_class_unload_events();
}
return seen_dead_loader;
}
