src/share/vm/gc/g1/g1Allocator.hpp

rev 12504 : 8171235: Move archive object code from G1MarkSweep into G1ArchiveAllocator
Reviewed-by:

*** 310,325 ****
    virtual void flush_and_retire_stats();
  
    virtual void waste(size_t& wasted, size_t& undo_wasted);
  };
  
  // G1ArchiveAllocator is used to allocate memory in archive
  // regions. Such regions are not modifiable by GC, being neither
  // scavenged nor compacted, or even marked in the object header.
  // They can contain no pointers to non-archive heap regions,
  class G1ArchiveAllocator : public CHeapObj<mtGC> {
- 
  protected:
    G1CollectedHeap* _g1h;
  
    // The current allocation region
    HeapRegion* _allocation_region;
--- 310,332 ----
    virtual void flush_and_retire_stats();
  
    virtual void waste(size_t& wasted, size_t& undo_wasted);
  };
  
+ // G1ArchiveRegionMap is a boolean array used to mark G1 regions as
+ // archive regions.  This allows a quick check for whether an object
+ // should not be marked because it is in an archive region.
+ class G1ArchiveRegionMap : public G1BiasedMappedArray<bool> {
+ protected:
+   bool default_value() const { return false; }
+ };
+ 
  // G1ArchiveAllocator is used to allocate memory in archive
  // regions. Such regions are not modifiable by GC, being neither
  // scavenged nor compacted, or even marked in the object header.
  // They can contain no pointers to non-archive heap regions,
  class G1ArchiveAllocator : public CHeapObj<mtGC> {
  protected:
    G1CollectedHeap* _g1h;
  
    // The current allocation region
    HeapRegion* _allocation_region;
*** 376,383 ****
--- 383,408 ----
    // regions, including those still associated with this allocator.
    void clear_used() {
      _summary_bytes_used = 0;
    }
  
+   // Create the _archive_region_map which is used to identify archive objects.
+   static inline void enable_archive_object_check();
+ 
+   // Set the regions containing the specified address range as archive/non-archive.
+   static inline void set_range_archive(MemRegion range, bool is_archive);
+ 
+   static inline bool is_archive_object(oop object);
+ 
+ private:
+   static bool _archive_check_enabled;
+   static G1ArchiveRegionMap  _archive_region_map;
+ 
+   // Check if an object is in an archive region using the _archive_region_map.
+   static inline bool in_archive_range(oop object);
+ 
+   // Check if archive object checking is enabled, to avoid calling in_archive_range
+   // unnecessarily.
+   static inline bool archive_check_enabled();
  };
  
  #endif // SHARE_VM_GC_G1_G1ALLOCATOR_HPP