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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * 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_VM_GC_G1_G1OOPCLOSURES_HPP

#define SHARE_VM_GC_G1_G1OOPCLOSURES_HPP

#include "memory/iterator.hpp"

#include "oops/markOop.hpp"

class HeapRegion;

class G1CollectedHeap;

class G1RemSet;

class G1ConcurrentMark;

class DirtyCardToOopClosure;

class G1CMBitMap;

class G1ParScanThreadState;

class G1CMTask;

class ReferenceProcessor;

// A class that scans oops in a given heap region (much as OopsInGenClosure

// scans oops in a generation.)

class OopsInHeapRegionClosure: public ExtendedOopClosure {

protected:

  HeapRegion* _from;

public:

  void set_region(HeapRegion* from) { _from = from; }

};

class G1ParClosureSuper : public OopsInHeapRegionClosure {

protected:

  G1CollectedHeap* _g1;

  G1ParScanThreadState* _par_scan_state;

  G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);

  ~G1ParClosureSuper() { }

public:

  // This closure needs special handling for InstanceRefKlass.

  virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }

};

class G1ParPushHeapRSClosure : public G1ParClosureSuper {

public:

  G1ParPushHeapRSClosure(G1CollectedHeap* g1,

                         G1ParScanThreadState* par_scan_state):

    G1ParClosureSuper(g1, par_scan_state) { }

  template <class T> void do_oop_nv(T* p);

  virtual void do_oop(oop* p)          { do_oop_nv(p); }

  virtual void do_oop(narrowOop* p)    { do_oop_nv(p); }

};

class G1ParScanClosure : public G1ParClosureSuper {

public:

  G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :

    G1ParClosureSuper(g1, par_scan_state) { }

  template <class T> void do_oop_nv(T* p);

  virtual void do_oop(oop* p)          { do_oop_nv(p); }

  virtual void do_oop(narrowOop* p)    { do_oop_nv(p); }

  void set_ref_processor(ReferenceProcessor* rp) {

    set_ref_processor_internal(rp);

  }

};

// Add back base class for metadata

class G1ParCopyHelper : public OopClosure {

protected:

  G1CollectedHeap* _g1;

  G1ParScanThreadState* _par_scan_state;

  uint _worker_id;              // Cache value from par_scan_state.

  Klass* _scanned_klass;

  G1ConcurrentMark* _cm;

  // Mark the object if it's not already marked. This is used to mark

  // objects pointed to by roots that are guaranteed not to move

  // during the GC (i.e., non-CSet objects). It is MT-safe.

  inline void mark_object(oop obj);

  // Mark the object if it's not already marked. This is used to mark

  // objects pointed to by roots that have been forwarded during a

  // GC. It is MT-safe.

  inline void mark_forwarded_object(oop from_obj, oop to_obj);

  G1ParCopyHelper(G1CollectedHeap* g1,  G1ParScanThreadState* par_scan_state);

  ~G1ParCopyHelper() { }

 public:

  void set_scanned_klass(Klass* k) { _scanned_klass = k; }

  template <class T> inline void do_klass_barrier(T* p, oop new_obj);

};

enum G1Barrier {

  G1BarrierNone,

  G1BarrierKlass

};

enum G1Mark {

  G1MarkNone,

  G1MarkFromRoot,

  G1MarkPromotedFromRoot

};

template <G1Barrier barrier, G1Mark do_mark_object, bool use_ext>

class G1ParCopyClosure : public G1ParCopyHelper {

public:

  G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :

      G1ParCopyHelper(g1, par_scan_state) { }

  template <class T> void do_oop_work(T* p);

  virtual void do_oop(oop* p)       { do_oop_work(p); }

  virtual void do_oop(narrowOop* p) { do_oop_work(p); }

};

class G1KlassScanClosure : public KlassClosure {

 G1ParCopyHelper* _closure;

 bool             _process_only_dirty;

 int              _count;

 public:

  G1KlassScanClosure(G1ParCopyHelper* closure, bool process_only_dirty)

      : _process_only_dirty(process_only_dirty), _closure(closure), _count(0) {}

  void do_klass(Klass* klass);

};

// Closure for iterating over object fields during concurrent marking

class G1CMOopClosure : public MetadataAwareOopClosure {

protected:

  G1ConcurrentMark*  _cm;

private:

  G1CollectedHeap*   _g1h;

  G1CMTask*          _task;

public:

  G1CMOopClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, G1CMTask* task);

  template <class T> void do_oop_nv(T* p);

  virtual void do_oop(      oop* p) { do_oop_nv(p); }

  virtual void do_oop(narrowOop* p) { do_oop_nv(p); }

};

// Closure to scan the root regions during concurrent marking

class G1RootRegionScanClosure : public MetadataAwareOopClosure {

private:

  G1CollectedHeap* _g1h;

  G1ConcurrentMark* _cm;

public:

  G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm) :

    _g1h(g1h), _cm(cm) { }

  template <class T> void do_oop_nv(T* p);

  virtual void do_oop(      oop* p) { do_oop_nv(p); }

  virtual void do_oop(narrowOop* p) { do_oop_nv(p); }

};

class G1ConcurrentRefineOopClosure: public ExtendedOopClosure {

  G1CollectedHeap* _g1;

  uint _worker_i;

public:

  G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) :

    _g1(g1h),

    _worker_i(worker_i) {

  }

  // This closure needs special handling for InstanceRefKlass.

  virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }

  template <class T> void do_oop_nv(T* p);

  virtual void do_oop(narrowOop* p) { do_oop_nv(p); }

  virtual void do_oop(oop* p) { do_oop_nv(p); }

};

class G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {

  G1CollectedHeap* _g1;

  HeapRegion* _from;

  G1ParPushHeapRSClosure* _push_ref_cl;

  bool _record_refs_into_cset;

  uint _worker_i;

  bool _has_refs_into_cset;

public:

  G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,

                                G1ParPushHeapRSClosure* push_ref_cl,

                                bool record_refs_into_cset,

                                uint worker_i = 0);

  void set_from(HeapRegion* from) {

    assert(from != NULL, "from region must be non-NULL");

    _from = from;

  }

  bool self_forwarded(oop obj) {

    markOop m = obj->mark();

    bool result = (m->is_marked() && ((oop)m->decode_pointer() == obj));

    return result;

  }

  bool has_refs_into_cset() const { return _has_refs_into_cset; }

  template <class T> inline void do_oop_nv(T* p);

  virtual inline void do_oop(narrowOop* p);

  virtual inline void do_oop(oop* p);

  // This closure needs special handling for InstanceRefKlass.

  virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }

};

#endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP