src/hotspot/share/gc/shenandoah/shenandoahHeapRegionClosures.hpp

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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCLOSURES_HPP
#define SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCLOSURES_HPP


#include "gc/shenandoah/shenandoahHeap.hpp"
#include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"

// Applies the given closure to all regions with the given affiliation
template<ShenandoahAffiliation AFFILIATION>
class ShenandoahIncludeRegionClosure : public ShenandoahHeapRegionClosure {
private:
  ShenandoahHeapRegionClosure* _closure;

public:
  explicit ShenandoahIncludeRegionClosure(ShenandoahHeapRegionClosure* closure): _closure(closure) {}

  void heap_region_do(ShenandoahHeapRegion* r) override {
    if (r->affiliation() == AFFILIATION) {
      _closure->heap_region_do(r);
    }
  }

  bool is_thread_safe() override {
    return _closure->is_thread_safe();
  }
};

// Applies the given closure to all regions without the given affiliation
template<ShenandoahAffiliation AFFILIATION>
class ShenandoahExcludeRegionClosure : public ShenandoahHeapRegionClosure {
private:
  ShenandoahHeapRegionClosure* _closure;

public:
  explicit ShenandoahExcludeRegionClosure(ShenandoahHeapRegionClosure* closure): _closure(closure) {}

  void heap_region_do(ShenandoahHeapRegion* r) override {
    if (r->affiliation() != AFFILIATION) {
      _closure->heap_region_do(r);
    }
  }

  bool is_thread_safe() override {
    return _closure->is_thread_safe();
  }
};

// Makes regions pinned or unpinned according to the region's pin count
class ShenandoahSynchronizePinnedRegionStates : public ShenandoahHeapRegionClosure {
private:
  ShenandoahHeapLock* const _lock;

public:
  ShenandoahSynchronizePinnedRegionStates();

  void heap_region_do(ShenandoahHeapRegion* r) override;
  bool is_thread_safe() override { return true; }

  void synchronize_pin_count(ShenandoahHeapRegion* r);
};

class ShenandoahMarkingContext;

// Synchronizes region pinned status, sets update watermark and adjust live data tally for regions
class ShenandoahFinalMarkUpdateRegionStateClosure : public ShenandoahHeapRegionClosure {
private:
  ShenandoahMarkingContext* const _ctx;
  ShenandoahSynchronizePinnedRegionStates _pins;
public:
  explicit ShenandoahFinalMarkUpdateRegionStateClosure(ShenandoahMarkingContext* ctx);

  void heap_region_do(ShenandoahHeapRegion* r) override;
  bool is_thread_safe() override { return true; }
};

#endif // SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCLOSURES_HPP