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 /*

  * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.

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

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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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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP

 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP

 class HeapRegion;

 class G1CollectedHeap;

 class G1RemSet;

 class ConcurrentMark;

 class DirtyCardToOopClosure;

 class CMBitMap;

 class CMMarkStack;

 class G1ParScanThreadState;

 class CMTask;

 // 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:

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

 };

 class G1ParClosureSuper : public OopsInHeapRegionClosure {

 protected:

   G1CollectedHeap* _g1;

   G1RemSet* _g1_rem;

   ConcurrentMark* _cm;

   G1ParScanThreadState* _par_scan_state;

   bool _during_initial_mark;

   bool _mark_in_progress;

 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_object(T* p);

   oop copy_to_survivor_space(oop obj, bool should_mark_copy);

 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_object>

 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);

   }

   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 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; }

 };

 // Closure for iterating over object fields during concurrent marking

 class G1CMOopClosure : public OopClosure {

   G1CollectedHeap*   _g1h;

   ConcurrentMark*    _cm;

   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); }

 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP