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

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@@ -41,13 +41,30 @@
    // Bias cset map's base address for fast test if an oop is in cset
    char* const           _biased_cset_map;
  
    ShenandoahHeap* const _heap;
  
+   bool                  _has_old_regions;
    size_t                _garbage;
    size_t                _used;
    size_t                _region_count;
+   size_t                _immediate_trash;
+   size_t                _evacuation_reserve; // How many bytes reserved in generation for evacuation replicas.  This does
+                                              // not include bytes reserved for old-generation replicas.  The value is
+                                              // conservative in that memory may be reserved for objects that will be promoted.
+   size_t                _young_bytes_to_evacuate;
+   size_t                _young_bytes_to_promote;
+   size_t                _old_bytes_to_evacuate;
+ 
+   size_t                _young_region_count;
+   size_t                _old_region_count;
+ 
+   size_t                _old_garbage;        // How many bytes of old garbage are present in a mixed collection set?
+ 
+   bool*                 _preselected_regions;   // Points to array identifying which tenure-age regions have been preselected
+                                                 // for inclusion in collection set.  This field is only valid during brief
+                                                 // spans of time while collection set is being constructed.
  
    shenandoah_padding(0);
    volatile size_t       _current_index;
    shenandoah_padding(1);
  

@@ -75,12 +92,41 @@
    inline bool is_in(oop obj)                 const;
    inline bool is_in_loc(void* loc)           const;
  
    void print_on(outputStream* out) const;
  
-   size_t used()      const { return _used; }
-   size_t garbage()   const { return _garbage;   }
+   inline size_t get_immediate_trash();
+   inline void set_immediate_trash(size_t immediate_trash);
+ 
+   // This represents total amount of work to be performed by evacuation, including evacuations to young, to old,
+   // and promotions from young to old.  This equals get_young_bytes_reserved_for_evacuation() plus
+   // get_old_bytes_reserved_for_evacuation().
+   inline size_t get_bytes_reserved_for_evacuation();
+ 
+   // It is not known how many of these bytes will be promoted.
+   inline size_t get_young_bytes_reserved_for_evacuation();
+   inline void reserve_young_bytes_for_evacuation(size_t byte_count);
+ 
+   inline size_t get_old_bytes_reserved_for_evacuation();
+   inline void reserve_old_bytes_for_evacuation(size_t byte_count);
+ 
+   inline size_t get_young_bytes_to_be_promoted();
+ 
+   inline size_t get_old_region_count();
+ 
+   inline size_t get_young_region_count();
+ 
+   inline size_t get_old_garbage();
+ 
+   void establish_preselected(bool *preselected) { _preselected_regions = preselected; }
+   void abandon_preselected() { _preselected_regions = nullptr; }
+   bool is_preselected(size_t region_idx) { return (_preselected_regions != nullptr) && _preselected_regions[region_idx]; }
+ 
+   bool has_old_regions() const { return _has_old_regions; }
+   size_t used()          const { return _used; }
+ 
+   size_t garbage()       const { return _garbage; }
    void clear();
  
  private:
    char* map_address() const {
      return _cset_map;
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