/*

 * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved.

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

 *

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

class HeapRegion;

class G1CollectedHeap;

class G1RemSet;

class ConcurrentMark;

class DirtyCardToOopClosure;

class CMBitMap;

class CMMarkStack;

class G1ParScanThreadState;

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

// scans oops in a generation.)

class OopsInHeapRegionClosure: public OopsInGenClosure {

protected:

  HeapRegion* _from;

public:

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

};

class G1ParClosureSuper : public OopsInHeapRegionClosure {

protected:

  G1CollectedHeap* _g1;

  G1RemSet* _g1_rem;

  ConcurrentMark* _cm;

  G1ParScanThreadState* _par_scan_state;

public:

  G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state);

  bool apply_to_weak_ref_discovered_field() { return true; }

};

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); }

};

#define G1_PARTIAL_ARRAY_MASK 0x2

template <class T> inline bool has_partial_array_mask(T* ref) {

  return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;

}

template <class T> inline T* set_partial_array_mask(T obj) {

  assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");

  return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);

}

template <class T> inline oop clear_partial_array_mask(T* ref) {

  return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);

}

class G1ParScanPartialArrayClosure : public G1ParClosureSuper {

  G1ParScanClosure _scanner;

public:

  G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :

    G1ParClosureSuper(g1, par_scan_state), _scanner(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 G1ParCopyHelper : public G1ParClosureSuper {

  G1ParScanClosure *_scanner;

protected:

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

  oop copy_to_survivor_space(oop obj);

public:

  G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,

                  G1ParScanClosure *scanner) :

    G1ParClosureSuper(g1, par_scan_state), _scanner(scanner) { }

};

template<bool do_gen_barrier, G1Barrier barrier,

         bool do_mark_forwardee>

class G1ParCopyClosure : public G1ParCopyHelper {

  G1ParScanClosure _scanner;

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

public:

  G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :

    _scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { }

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

    do_oop_work(p);

    if (do_mark_forwardee)

      mark_forwardee(p);

  }

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

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

};

typedef G1ParCopyClosure<false, G1BarrierNone, false> G1ParScanExtRootClosure;

typedef G1ParCopyClosure<true,  G1BarrierNone, false> G1ParScanPermClosure;

typedef G1ParCopyClosure<false, G1BarrierRS,   false> G1ParScanHeapRSClosure;

typedef G1ParCopyClosure<false, G1BarrierNone, true> G1ParScanAndMarkExtRootClosure;

typedef G1ParCopyClosure<true,  G1BarrierNone, true> G1ParScanAndMarkPermClosure;

typedef G1ParCopyClosure<false, G1BarrierRS,   true> G1ParScanAndMarkHeapRSClosure;

// This is the only case when we set skip_cset_test. Basically, this

// closure is (should?) only be called directly while we're draining

// the overflow and task queues. In that case we know that the

// reference in question points into the collection set, otherwise we

// would not have pushed it on the queue. The following is defined in

// g1_specialized_oop_closures.hpp.

// typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;

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

// failure processing, as we cannot asume that the reference already

// points into the collection set (like G1ParScanHeapEvacClosure does).

typedef G1ParCopyClosure<false, G1BarrierEvac, false> G1ParScanHeapEvacFailureClosure;

class FilterIntoCSClosure: public OopClosure {

  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; }

  bool do_header() { return false; }

};

class FilterInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {

  G1CollectedHeap* _g1;

  OopsInHeapRegionClosure* _oc;

public:

  FilterInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,

                                     OopsInHeapRegionClosure* oc) :

    _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; }

  bool do_header() { return false; }

  void set_region(HeapRegion* from) {

    _oc->set_region(from);

  }

};

class FilterAndMarkInHeapRegionAndIntoCSClosure : public OopsInHeapRegionClosure {

  G1CollectedHeap* _g1;

  ConcurrentMark* _cm;

  OopsInHeapRegionClosure* _oc;

public:

  FilterAndMarkInHeapRegionAndIntoCSClosure(G1CollectedHeap* g1,

                                            OopsInHeapRegionClosure* oc,

                                            ConcurrentMark* cm)

  : _g1(g1), _oc(oc), _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); }

  bool apply_to_weak_ref_discovered_field() { return true; }

  bool do_header() { return false; }

  void set_region(HeapRegion* from) {

    _oc->set_region(from);

  }

};

class FilterOutOfRegionClosure: public OopClosure {

  HeapWord* _r_bottom;

  HeapWord* _r_end;

  OopClosure* _oc;

  int _out_of_region;

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; }

  bool do_header() { return false; }

  int out_of_region() { return _out_of_region; }

};