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comparison src/share/vm/classfile/classLoaderData.cpp @ 14484:3cdda110bbb5

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8035412: Cleanup ClassLoaderData::is_alive Reviewed-by: coleenp, mgerdin
author stefank
date Fri, 21 Feb 2014 10:19:09 +0100
parents ce86c36b8921
children f460c6926af7
comparison
equal deleted inserted replaced
14483:be0ac0e8f6e7 14484:3cdda110bbb5
71 71
72 ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL; 72 ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL;
73 73
74 ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies) : 74 ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies) :
75 _class_loader(h_class_loader()), 75 _class_loader(h_class_loader()),
76 _is_anonymous(is_anonymous), _keep_alive(is_anonymous), // initially 76 _is_anonymous(is_anonymous),
77 // An anonymous class loader data doesn't have anything to keep
78 // it from being unloaded during parsing of the anonymous class.
79 // The null-class-loader should always be kept alive.
80 _keep_alive(is_anonymous || h_class_loader.is_null()),
77 _metaspace(NULL), _unloading(false), _klasses(NULL), 81 _metaspace(NULL), _unloading(false), _klasses(NULL),
78 _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL), 82 _claimed(0), _jmethod_ids(NULL), _handles(NULL), _deallocate_list(NULL),
79 _next(NULL), _dependencies(dependencies), 83 _next(NULL), _dependencies(dependencies),
80 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) { 84 _metaspace_lock(new Mutex(Monitor::leaf+1, "Metaspace allocation lock", true)) {
81 // empty 85 // empty
315 } 319 }
316 tty->print_cr("]"); 320 tty->print_cr("]");
317 } 321 }
318 } 322 }
319 323
324 oop ClassLoaderData::keep_alive_object() const {
325 assert(!keep_alive(), "Don't use with CLDs that are artificially kept alive");
326 return is_anonymous() ? _klasses->java_mirror() : class_loader();
327 }
328
320 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const { 329 bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const {
321 bool alive = 330 bool alive = keep_alive() // null class loader and incomplete anonymous klasses.
322 is_anonymous() ? 331 || is_alive_closure->do_object_b(keep_alive_object());
323 is_alive_closure->do_object_b(_klasses->java_mirror()) : 332
324 class_loader() == NULL || is_alive_closure->do_object_b(class_loader());
325 assert(!alive || claimed(), "must be claimed"); 333 assert(!alive || claimed(), "must be claimed");
326 return alive; 334 return alive;
327 } 335 }
328 336
329 337
589 } 597 }
590 } 598 }
591 599
592 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) { 600 void ClassLoaderDataGraph::always_strong_oops_do(OopClosure* f, KlassClosure* klass_closure, bool must_claim) {
593 if (ClassUnloading) { 601 if (ClassUnloading) {
594 ClassLoaderData::the_null_class_loader_data()->oops_do(f, klass_closure, must_claim);
595 // keep any special CLDs alive.
596 ClassLoaderDataGraph::keep_alive_oops_do(f, klass_closure, must_claim); 602 ClassLoaderDataGraph::keep_alive_oops_do(f, klass_closure, must_claim);
597 } else { 603 } else {
598 ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim); 604 ClassLoaderDataGraph::oops_do(f, klass_closure, must_claim);
599 } 605 }
600 } 606 }
696 // mark metadata seen on the stack and code cache so we can delete 702 // mark metadata seen on the stack and code cache so we can delete
697 // unneeded entries. 703 // unneeded entries.
698 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class(); 704 bool has_redefined_a_class = JvmtiExport::has_redefined_a_class();
699 MetadataOnStackMark md_on_stack; 705 MetadataOnStackMark md_on_stack;
700 while (data != NULL) { 706 while (data != NULL) {
701 if (data->keep_alive() || data->is_alive(is_alive_closure)) { 707 if (data->is_alive(is_alive_closure)) {
702 if (has_redefined_a_class) { 708 if (has_redefined_a_class) {
703 data->classes_do(InstanceKlass::purge_previous_versions); 709 data->classes_do(InstanceKlass::purge_previous_versions);
704 } 710 }
705 data->free_deallocate_list(); 711 data->free_deallocate_list();
706 prev = data; 712 prev = data;