1 /*
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  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
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  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
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 24 
 25 #ifndef SHARE_GC_G1_G1FULLGCPREPARETASK_HPP
 26 #define SHARE_GC_G1_G1FULLGCPREPARETASK_HPP
 27 
 28 #include "gc/g1/g1FullGCTask.hpp"
 29 #include "gc/g1/heapRegion.hpp"
 30 #include "memory/allocation.hpp"
 31 
 32 class G1CollectedHeap;
 33 class G1CMBitMap;
 34 class G1FullCollector;
 35 class G1FullGCCompactionPoint;
 36 class HeapRegion;
 37 
 38 // Determines the regions in the heap that should be part of the compaction and
 39 // distributes them among the compaction queues in round-robin fashion.
 40 class G1DetermineCompactionQueueClosure : public HeapRegionClosure {
 41   G1CollectedHeap* _g1h;
 42   G1FullCollector* _collector;
 43   uint _cur_worker;
 44 
 45   template<bool is_humongous>
 46   inline void free_pinned_region(HeapRegion* hr);
 47 
 48   inline bool should_compact(HeapRegion* hr) const;
 49 
 50   // Returns the current worker id to assign a compaction point to, and selects
 51   // the next one round-robin style.
 52   inline uint next_worker();
 53 
 54   inline G1FullGCCompactionPoint* next_compaction_point();
 55 
 56   inline void add_to_compaction_queue(HeapRegion* hr);
 57 
 58 public:
 59   G1DetermineCompactionQueueClosure(G1FullCollector* collector);
 60 
 61   inline bool do_heap_region(HeapRegion* hr) override;
 62 };
 63 
 64 class G1FullGCPrepareTask : public G1FullGCTask {
 65   volatile bool     _has_free_compaction_targets;
 66   HeapRegionClaimer _hrclaimer;
 67 
 68   void set_has_free_compaction_targets();
 69 
 70 public:
 71   G1FullGCPrepareTask(G1FullCollector* collector);
 72   void work(uint worker_id);
 73   // After the Prepare phase, are there any unused (empty) regions (compaction
 74   // targets) at the end of any compaction queues?
 75   bool has_free_compaction_targets();
 76 
 77 private:
 78   class G1CalculatePointersClosure : public HeapRegionClosure {
 79     G1CollectedHeap* _g1h;
 80     G1FullCollector* _collector;
 81     G1CMBitMap* _bitmap;
 82     G1FullGCCompactionPoint* _cp;
 83 
 84     void prepare_for_compaction(HeapRegion* hr);
 85 
 86   public:
 87     G1CalculatePointersClosure(G1FullCollector* collector,
 88                                G1FullGCCompactionPoint* cp);
 89 
 90     bool do_heap_region(HeapRegion* hr);
 91   };
 92 
 93   class G1ResetMetadataClosure : public HeapRegionClosure {
 94     G1CollectedHeap* _g1h;
 95     G1FullCollector* _collector;
 96 
 97     void reset_region_metadata(HeapRegion* hr);
 98 
 99   public:
100     G1ResetMetadataClosure(G1FullCollector* collector);
101 
102     bool do_heap_region(HeapRegion* hr);
103   };
104 
105   class G1PrepareCompactLiveClosure : public StackObj {
106     G1FullGCCompactionPoint* _cp;
107 
108   public:
109     G1PrepareCompactLiveClosure(G1FullGCCompactionPoint* cp);
110     size_t apply(oop object);
111   };
112 };
113 
114 // Closure to re-prepare objects in the serial compaction point queue regions for
115 // serial compaction.
116 class G1SerialRePrepareClosure : public StackObj {
117   G1FullGCCompactionPoint* _cp;
118   HeapRegion* _current;
119 
120 public:
121   G1SerialRePrepareClosure(G1FullGCCompactionPoint* hrcp, HeapRegion* hr) :
122     _cp(hrcp),
123     _current(hr) { }
124 
125   inline size_t apply(oop obj);
126 };
127 
128 #endif // SHARE_GC_G1_G1FULLGCPREPARETASK_HPP