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), |
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77 // An anonymous class loader data doesn't have anything to keep |
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78 // it from being unloaded during parsing of the anonymous class. |
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79 // The null-class-loader should always be kept alive. |
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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 |
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324 oop ClassLoaderData::keep_alive_object() const { |
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325 assert(!keep_alive(), "Don't use with CLDs that are artificially kept alive"); |
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326 return is_anonymous() ? _klasses->java_mirror() : class_loader(); |
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327 } |
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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()); |
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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); |
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595 // keep any special CLDs alive. |
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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; |