Mon, 08 Dec 2014 18:57:33 +0100
8067655: Clean up G1 remembered set oop iteration
Summary: Pass on the static type G1ParPushHeapRSClosure to allow oop_iterate devirtualization
Reviewed-by: jmasa, kbarrett
1 /*
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP
28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
29 #include "gc_implementation/g1/heapRegion.hpp"
30 #include "memory/genMarkSweep.hpp"
31 #include "memory/generation.hpp"
32 #include "memory/universe.hpp"
33 #include "oops/markOop.hpp"
34 #include "oops/oop.hpp"
35 #include "runtime/timer.hpp"
36 #include "utilities/growableArray.hpp"
38 class ReferenceProcessor;
40 // G1MarkSweep takes care of global mark-compact garbage collection for a
41 // G1CollectedHeap using a four-phase pointer forwarding algorithm. All
42 // generations are assumed to support marking; those that can also support
43 // compaction.
44 //
45 // Class unloading will only occur when a full gc is invoked.
46 class G1PrepareCompactClosure;
48 class G1MarkSweep : AllStatic {
49 friend class VM_G1MarkSweep;
50 friend class Scavenge;
52 public:
54 static void invoke_at_safepoint(ReferenceProcessor* rp,
55 bool clear_all_softrefs);
57 static STWGCTimer* gc_timer() { return GenMarkSweep::_gc_timer; }
58 static SerialOldTracer* gc_tracer() { return GenMarkSweep::_gc_tracer; }
60 private:
62 // Mark live objects
63 static void mark_sweep_phase1(bool& marked_for_deopt,
64 bool clear_all_softrefs);
65 // Calculate new addresses
66 static void mark_sweep_phase2();
67 // Update pointers
68 static void mark_sweep_phase3();
69 // Move objects to new positions
70 static void mark_sweep_phase4();
72 static void allocate_stacks();
73 static void prepare_compaction();
74 static void prepare_compaction_work(G1PrepareCompactClosure* blk);
75 };
77 class G1PrepareCompactClosure : public HeapRegionClosure {
78 protected:
79 G1CollectedHeap* _g1h;
80 ModRefBarrierSet* _mrbs;
81 CompactPoint _cp;
82 HeapRegionSetCount _humongous_regions_removed;
84 virtual void prepare_for_compaction(HeapRegion* hr, HeapWord* end);
85 void prepare_for_compaction_work(CompactPoint* cp, HeapRegion* hr, HeapWord* end);
86 void free_humongous_region(HeapRegion* hr);
87 bool is_cp_initialized() const { return _cp.space != NULL; }
89 public:
90 G1PrepareCompactClosure() :
91 _g1h(G1CollectedHeap::heap()),
92 _mrbs(_g1h->g1_barrier_set()),
93 _humongous_regions_removed() { }
95 void update_sets();
96 bool doHeapRegion(HeapRegion* hr);
97 };
99 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP