src/hotspot/share/gc/z/zHeapIterator.hpp
author pliden
Tue, 12 Jun 2018 17:40:28 +0200
changeset 50525 767cdb97f103
child 50871 d283a214f42b
permissions -rw-r--r--
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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 * 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.
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#ifndef SHARE_GC_Z_ZHEAPITERATOR_HPP
#define SHARE_GC_Z_ZHEAPITERATOR_HPP

#include "gc/z/zAddressRangeMap.hpp"
#include "gc/z/zGlobals.hpp"
#include "memory/allocation.hpp"
#include "utilities/stack.hpp"

class ZHeapIteratorBitMap;

class ZHeapIterator : public StackObj {
  friend class ZHeapIteratorRootOopClosure;
  friend class ZHeapIteratorPushOopClosure;

private:
  typedef ZAddressRangeMap<ZHeapIteratorBitMap*, ZPageSizeMinShift>         ZVisitMap;
  typedef ZAddressRangeMapIterator<ZHeapIteratorBitMap*, ZPageSizeMinShift> ZVisitMapIterator;
  typedef Stack<oop, mtGC>                                                  ZVisitStack;

  ZVisitStack _visit_stack;
  ZVisitMap   _visit_map;

  size_t object_index_max() const;
  size_t object_index(oop obj) const;
  ZHeapIteratorBitMap* object_map(oop obj);

  void push(oop obj);
  void drain(ObjectClosure* cl);

public:
  ZHeapIterator();
  ~ZHeapIterator();

  void objects_do(ObjectClosure* cl);
};

#endif // SHARE_GC_Z_ZHEAPITERATOR_HPP