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 /*

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  * 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

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  * 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

 #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);

 };

 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); }

 };

 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_HPP