8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
Reviewed-by: pliden, stefank, eosterlund, ehelin, sjohanss, rbackman, coleenp, ihse, jgeorge, lmesnik, rkennke
Contributed-by: per.liden@oracle.com, stefan.karlsson@oracle.com, erik.osterlund@oracle.com, mikael.gerdin@oracle.com, kim.barrett@oracle.com, nils.eliasson@oracle.com, rickard.backman@oracle.com, rwestrel@redhat.com, coleen.phillimore@oracle.com, robbin.ehn@oracle.com, gerard.ziemski@oracle.com, hugh.wilkinson@intel.com, sandhya.viswanathan@intel.com, bill.npo.wheeler@intel.com, vinay.k.awasthi@intel.com, yasuenag@gmail.com
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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#ifndef SHARE_GC_Z_ZROOTSITERATOR_HPP
#define SHARE_GC_Z_ZROOTSITERATOR_HPP
#include "gc/shared/oopStorageParState.hpp"
#include "memory/allocation.hpp"
#include "memory/iterator.hpp"
#include "utilities/globalDefinitions.hpp"
typedef OopStorage::ParState<false /* concurrent */, false /* is_const */> ZOopStorageIterator;
typedef OopStorage::ParState<true /* concurrent */, false /* is_const */> ZConcurrentOopStorageIterator;
template <typename T, void (T::*F)(OopClosure*)>
class ZSerialOopsDo {
private:
T* const _iter;
volatile bool _claimed;
public:
ZSerialOopsDo(T* iter);
void oops_do(OopClosure* cl);
};
template <typename T, void (T::*F)(OopClosure*)>
class ZParallelOopsDo {
private:
T* const _iter;
volatile bool _completed;
public:
ZParallelOopsDo(T* iter);
void oops_do(OopClosure* cl);
};
template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
class ZSerialWeakOopsDo {
private:
T* const _iter;
volatile bool _claimed;
public:
ZSerialWeakOopsDo(T* iter);
void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl);
};
template <typename T, void (T::*F)(BoolObjectClosure*, OopClosure*)>
class ZParallelWeakOopsDo {
private:
T* const _iter;
volatile bool _completed;
public:
ZParallelWeakOopsDo(T* iter);
void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl);
};
class ZRootsIterator {
private:
ZOopStorageIterator _vm_weak_handles_iter;
ZOopStorageIterator _jni_handles_iter;
ZOopStorageIterator _jni_weak_handles_iter;
ZOopStorageIterator _string_table_iter;
void do_universe(OopClosure* cl);
void do_vm_weak_handles(OopClosure* cl);
void do_jni_handles(OopClosure* cl);
void do_jni_weak_handles(OopClosure* cl);
void do_object_synchronizer(OopClosure* cl);
void do_management(OopClosure* cl);
void do_jvmti_export(OopClosure* cl);
void do_jvmti_weak_export(OopClosure* cl);
void do_jfr_weak(OopClosure* cl);
void do_system_dictionary(OopClosure* cl);
void do_class_loader_data_graph(OopClosure* cl);
void do_threads(OopClosure* cl);
void do_code_cache(OopClosure* cl);
void do_string_table(OopClosure* cl);
ZSerialOopsDo<ZRootsIterator, &ZRootsIterator::do_universe> _universe;
ZSerialOopsDo<ZRootsIterator, &ZRootsIterator::do_object_synchronizer> _object_synchronizer;
ZSerialOopsDo<ZRootsIterator, &ZRootsIterator::do_management> _management;
ZSerialOopsDo<ZRootsIterator, &ZRootsIterator::do_jvmti_export> _jvmti_export;
ZSerialOopsDo<ZRootsIterator, &ZRootsIterator::do_jvmti_weak_export> _jvmti_weak_export;
ZSerialOopsDo<ZRootsIterator, &ZRootsIterator::do_jfr_weak> _jfr_weak;
ZSerialOopsDo<ZRootsIterator, &ZRootsIterator::do_system_dictionary> _system_dictionary;
ZParallelOopsDo<ZRootsIterator, &ZRootsIterator::do_vm_weak_handles> _vm_weak_handles;
ZParallelOopsDo<ZRootsIterator, &ZRootsIterator::do_jni_handles> _jni_handles;
ZParallelOopsDo<ZRootsIterator, &ZRootsIterator::do_jni_weak_handles> _jni_weak_handles;
ZParallelOopsDo<ZRootsIterator, &ZRootsIterator::do_class_loader_data_graph> _class_loader_data_graph;
ZParallelOopsDo<ZRootsIterator, &ZRootsIterator::do_threads> _threads;
ZParallelOopsDo<ZRootsIterator, &ZRootsIterator::do_code_cache> _code_cache;
ZParallelOopsDo<ZRootsIterator, &ZRootsIterator::do_string_table> _string_table;
public:
ZRootsIterator();
~ZRootsIterator();
void oops_do(OopClosure* cl, bool visit_jvmti_weak_export = false);
};
class ZWeakRootsIterator {
private:
ZOopStorageIterator _vm_weak_handles_iter;
ZOopStorageIterator _jni_weak_handles_iter;
ZOopStorageIterator _string_table_iter;
void do_vm_weak_handles(BoolObjectClosure* is_alive, OopClosure* cl);
void do_jni_weak_handles(BoolObjectClosure* is_alive, OopClosure* cl);
void do_jvmti_weak_export(BoolObjectClosure* is_alive, OopClosure* cl);
void do_jfr_weak(BoolObjectClosure* is_alive, OopClosure* cl);
void do_symbol_table(BoolObjectClosure* is_alive, OopClosure* cl);
void do_string_table(BoolObjectClosure* is_alive, OopClosure* cl);
ZSerialWeakOopsDo<ZWeakRootsIterator, &ZWeakRootsIterator::do_jvmti_weak_export> _jvmti_weak_export;
ZSerialWeakOopsDo<ZWeakRootsIterator, &ZWeakRootsIterator::do_jfr_weak> _jfr_weak;
ZParallelWeakOopsDo<ZWeakRootsIterator, &ZWeakRootsIterator::do_vm_weak_handles> _vm_weak_handles;
ZParallelWeakOopsDo<ZWeakRootsIterator, &ZWeakRootsIterator::do_jni_weak_handles> _jni_weak_handles;
ZParallelWeakOopsDo<ZWeakRootsIterator, &ZWeakRootsIterator::do_symbol_table> _symbol_table;
ZParallelWeakOopsDo<ZWeakRootsIterator, &ZWeakRootsIterator::do_string_table> _string_table;
public:
ZWeakRootsIterator();
~ZWeakRootsIterator();
void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* cl);
void oops_do(OopClosure* cl);
};
class ZConcurrentWeakRootsIterator {
private:
ZConcurrentOopStorageIterator _vm_weak_handles_iter;
ZConcurrentOopStorageIterator _jni_weak_handles_iter;
ZConcurrentOopStorageIterator _string_table_iter;
void do_vm_weak_handles(OopClosure* cl);
void do_jni_weak_handles(OopClosure* cl);
void do_string_table(OopClosure* cl);
ZParallelOopsDo<ZConcurrentWeakRootsIterator, &ZConcurrentWeakRootsIterator::do_vm_weak_handles> _vm_weak_handles;
ZParallelOopsDo<ZConcurrentWeakRootsIterator, &ZConcurrentWeakRootsIterator::do_jni_weak_handles> _jni_weak_handles;
ZParallelOopsDo<ZConcurrentWeakRootsIterator, &ZConcurrentWeakRootsIterator::do_string_table> _string_table;
public:
ZConcurrentWeakRootsIterator();
void oops_do(OopClosure* cl);
};
class ZThreadRootsIterator {
private:
void do_threads(OopClosure* cl);
ZParallelOopsDo<ZThreadRootsIterator, &ZThreadRootsIterator::do_threads> _threads;
public:
ZThreadRootsIterator();
~ZThreadRootsIterator();
void oops_do(OopClosure* cl);
};
#endif // SHARE_GC_Z_ZROOTSITERATOR_HPP