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);
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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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