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src/hotspot/share/gc/g1/g1OopClosures.hpp

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rev 49826 : imported patch 6672778-partial-queue-trimming
rev 49827 : imported patch 6672778-refactoring


  40 class ReferenceProcessor;
  41 
  42 class G1ScanClosureBase : public ExtendedOopClosure {
  43 protected:
  44   G1CollectedHeap* _g1h;
  45   G1ParScanThreadState* _par_scan_state;
  46   HeapRegion* _from;
  47 
  48   G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state);
  49   ~G1ScanClosureBase() { }
  50 
  51   template <class T>
  52   inline void prefetch_and_push(T* p, oop const obj);
  53 
  54   template <class T>
  55   inline void handle_non_cset_obj_common(InCSetState const state, T* p, oop const obj);
  56 public:
  57   // This closure needs special handling for InstanceRefKlass.
  58   virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
  59   void set_region(HeapRegion* from) { _from = from; }


  60 };
  61 
  62 // Used during the Update RS phase to refine remaining cards in the DCQ during garbage collection.
  63 class G1ScanObjsDuringUpdateRSClosure: public G1ScanClosureBase {
  64   uint _worker_i;
  65 
  66 public:
  67   G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h,
  68                                   G1ParScanThreadState* pss,
  69                                   uint worker_i) :
  70     G1ScanClosureBase(g1h, pss), _worker_i(worker_i) { }
  71 
  72   template <class T> void do_oop_nv(T* p);
  73   virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
  74   virtual void do_oop(oop* p) { do_oop_nv(p); }
  75 };
  76 
  77 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection.
  78 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase {
  79 public:


 109   uint _worker_id;              // Cache value from par_scan_state.
 110   ClassLoaderData* _scanned_cld;
 111   G1ConcurrentMark* _cm;
 112 
 113   // Mark the object if it's not already marked. This is used to mark
 114   // objects pointed to by roots that are guaranteed not to move
 115   // during the GC (i.e., non-CSet objects). It is MT-safe.
 116   inline void mark_object(oop obj);
 117 
 118   // Mark the object if it's not already marked. This is used to mark
 119   // objects pointed to by roots that have been forwarded during a
 120   // GC. It is MT-safe.
 121   inline void mark_forwarded_object(oop from_obj, oop to_obj);
 122 
 123   G1ParCopyHelper(G1CollectedHeap* g1h,  G1ParScanThreadState* par_scan_state);
 124   ~G1ParCopyHelper() { }
 125 
 126  public:
 127   void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; }
 128   inline void do_cld_barrier(oop new_obj);


 129 };
 130 
 131 enum G1Barrier {
 132   G1BarrierNone,
 133   G1BarrierCLD
 134 };
 135 
 136 enum G1Mark {
 137   G1MarkNone,
 138   G1MarkFromRoot,
 139   G1MarkPromotedFromRoot
 140 };
 141 
 142 template <G1Barrier barrier, G1Mark do_mark_object>
 143 class G1ParCopyClosure : public G1ParCopyHelper {
 144 public:
 145   G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
 146       G1ParCopyHelper(g1h, par_scan_state) { }
 147 
 148   template <class T> void do_oop_work(T* p);




  40 class ReferenceProcessor;
  41 
  42 class G1ScanClosureBase : public ExtendedOopClosure {
  43 protected:
  44   G1CollectedHeap* _g1h;
  45   G1ParScanThreadState* _par_scan_state;
  46   HeapRegion* _from;
  47 
  48   G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state);
  49   ~G1ScanClosureBase() { }
  50 
  51   template <class T>
  52   inline void prefetch_and_push(T* p, oop const obj);
  53 
  54   template <class T>
  55   inline void handle_non_cset_obj_common(InCSetState const state, T* p, oop const obj);
  56 public:
  57   // This closure needs special handling for InstanceRefKlass.
  58   virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
  59   void set_region(HeapRegion* from) { _from = from; }
  60 
  61   inline void trim_queue_partially();
  62 };
  63 
  64 // Used during the Update RS phase to refine remaining cards in the DCQ during garbage collection.
  65 class G1ScanObjsDuringUpdateRSClosure: public G1ScanClosureBase {
  66   uint _worker_i;
  67 
  68 public:
  69   G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h,
  70                                   G1ParScanThreadState* pss,
  71                                   uint worker_i) :
  72     G1ScanClosureBase(g1h, pss), _worker_i(worker_i) { }
  73 
  74   template <class T> void do_oop_nv(T* p);
  75   virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
  76   virtual void do_oop(oop* p) { do_oop_nv(p); }
  77 };
  78 
  79 // Used during the Scan RS phase to scan cards from the remembered set during garbage collection.
  80 class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase {
  81 public:


 111   uint _worker_id;              // Cache value from par_scan_state.
 112   ClassLoaderData* _scanned_cld;
 113   G1ConcurrentMark* _cm;
 114 
 115   // Mark the object if it's not already marked. This is used to mark
 116   // objects pointed to by roots that are guaranteed not to move
 117   // during the GC (i.e., non-CSet objects). It is MT-safe.
 118   inline void mark_object(oop obj);
 119 
 120   // Mark the object if it's not already marked. This is used to mark
 121   // objects pointed to by roots that have been forwarded during a
 122   // GC. It is MT-safe.
 123   inline void mark_forwarded_object(oop from_obj, oop to_obj);
 124 
 125   G1ParCopyHelper(G1CollectedHeap* g1h,  G1ParScanThreadState* par_scan_state);
 126   ~G1ParCopyHelper() { }
 127 
 128  public:
 129   void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; }
 130   inline void do_cld_barrier(oop new_obj);
 131 
 132   inline void trim_queue_partially();
 133 };
 134 
 135 enum G1Barrier {
 136   G1BarrierNone,
 137   G1BarrierCLD
 138 };
 139 
 140 enum G1Mark {
 141   G1MarkNone,
 142   G1MarkFromRoot,
 143   G1MarkPromotedFromRoot
 144 };
 145 
 146 template <G1Barrier barrier, G1Mark do_mark_object>
 147 class G1ParCopyClosure : public G1ParCopyHelper {
 148 public:
 149   G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
 150       G1ParCopyHelper(g1h, par_scan_state) { }
 151 
 152   template <class T> void do_oop_work(T* p);


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