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 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * 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.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

#include "memory/iterator.hpp"

#include "oops/markOop.hpp"

class HeapRegion;

class G1CollectedHeap;

class G1RemSet;

class ConcurrentMark;

class DirtyCardToOopClosure;

class CMBitMap;

class CMMarkStack;

class G1ParScanThreadState;

class CMTask;

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;

  uint _worker_id;

public:

  // Initializes the instance, leaving _par_scan_state uninitialized. Must be done

  // later using the set_par_scan_thread_state() method.

  G1ParClosureSuper(G1CollectedHeap* g1);

  G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);

  bool apply_to_weak_ref_discovered_field() { return true; }

  void set_par_scan_thread_state(G1ParScanThreadState* par_scan_state);

};

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, ReferenceProcessor* rp) :

    G1ParClosureSuper(g1) {

    assert(_ref_processor == NULL, "sanity");

    _ref_processor = rp;

  }

  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); }

};

// Add back base class for metadata

class G1ParCopyHelper : public G1ParClosureSuper {

protected:

  Klass* _scanned_klass;

  ConcurrentMark* _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.

  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.

  void mark_forwarded_object(oop from_obj, oop to_obj);

 public:

  G1ParCopyHelper(G1CollectedHeap* g1,  G1ParScanThreadState* par_scan_state);

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

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

};

enum G1Barrier {

  G1BarrierNone,

  G1BarrierEvac,

  G1BarrierKlass

};

enum G1Mark {

  G1MarkNone,

  G1MarkFromRoot,

  G1MarkPromotedFromRoot

};

template <G1Barrier barrier, G1Mark do_mark_object>

class G1ParCopyClosure : public G1ParCopyHelper {

private:

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

public:

  G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,

                   ReferenceProcessor* rp) :

      G1ParCopyHelper(g1, par_scan_state) {

    assert(_ref_processor == NULL, "sanity");

  }

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

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

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

  G1CollectedHeap*      g1()  { return _g1; };

  G1ParScanThreadState* pss() { return _par_scan_state; }

  ReferenceProcessor*   rp()  { return _ref_processor; };

};

typedef G1ParCopyClosure<G1BarrierNone,  G1MarkNone>             G1ParScanExtRootClosure;

typedef G1ParCopyClosure<G1BarrierNone,  G1MarkFromRoot>         G1ParScanAndMarkExtRootClosure;

typedef G1ParCopyClosure<G1BarrierNone,  G1MarkPromotedFromRoot> G1ParScanAndMarkWeakExtRootClosure;

// We use a separate closure to handle references during evacuation

// failure processing.

typedef G1ParCopyClosure<G1BarrierEvac, G1MarkNone> G1ParScanHeapEvacFailureClosure;

class FilterIntoCSClosure: public ExtendedOopClosure {

  G1CollectedHeap* _g1;

  OopClosure* _oc;

  DirtyCardToOopClosure* _dcto_cl;

public:

  FilterIntoCSClosure(  DirtyCardToOopClosure* dcto_cl,

                        G1CollectedHeap* g1,

                        OopClosure* oc) :

    _dcto_cl(dcto_cl), _g1(g1), _oc(oc) { }

  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); }

  bool apply_to_weak_ref_discovered_field() { return true; }

};

class FilterOutOfRegionClosure: public ExtendedOopClosure {

  HeapWord* _r_bottom;

  HeapWord* _r_end;

  OopClosure* _oc;

public:

  FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);

  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); }

  bool apply_to_weak_ref_discovered_field() { return true; }

};

// Closure for iterating over object fields during concurrent marking

class G1CMOopClosure : public MetadataAwareOopClosure {

protected:

  ConcurrentMark*    _cm;

private:

  G1CollectedHeap*   _g1h;

  CMTask*            _task;

public:

  G1CMOopClosure(G1CollectedHeap* g1h, ConcurrentMark* cm, CMTask* 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;

  ConcurrentMark*  _cm;

  uint _worker_id;

public:

  G1RootRegionScanClosure(G1CollectedHeap* g1h, ConcurrentMark* cm,

                          uint worker_id) :

    _g1h(g1h), _cm(cm), _worker_id(worker_id) { }

  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 that applies the given two closures in sequence.

// Used by the RSet refinement code (when updating RSets

// during an evacuation pause) to record cards containing

// pointers into the collection set.

class G1Mux2Closure : public ExtendedOopClosure {

  OopClosure* _c1;

  OopClosure* _c2;

public:

  G1Mux2Closure(OopClosure *c1, OopClosure *c2);

  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); }

};

// A closure that returns true if it is actually applied

// to a reference

class G1TriggerClosure : public ExtendedOopClosure {

  bool _triggered;

public:

  G1TriggerClosure();

  bool triggered() const { return _triggered; }

  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); }

};

// A closure which uses a triggering closure to determine

// whether to apply an oop closure.

class G1InvokeIfNotTriggeredClosure: public ExtendedOopClosure {

  G1TriggerClosure* _trigger_cl;

  OopClosure* _oop_cl;

public:

  G1InvokeIfNotTriggeredClosure(G1TriggerClosure* t, OopClosure* oc);

  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 G1UpdateRSOrPushRefOopClosure: public ExtendedOopClosure {

  G1CollectedHeap* _g1;

  G1RemSet* _g1_rem_set;

  HeapRegion* _from;

  G1ParPushHeapRSClosure* _push_ref_cl;

  bool _record_refs_into_cset;

  uint _worker_i;

public:

  G1UpdateRSOrPushRefOopClosure(G1CollectedHeap* g1h,

                                G1RemSet* rs,

                                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 apply_to_weak_ref_discovered_field() { return true; }

  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); }

};