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src/hotspot/share/gc/shared/memAllocator.hpp

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  38   class Allocation;
  39 
  40   Thread* const        _thread;
  41   Klass* const         _klass;
  42   const size_t         _word_size;
  43 
  44 private:
  45   // Allocate from the current thread's TLAB, with broken-out slow path.
  46   HeapWord* allocate_inside_tlab(Allocation& allocation) const;
  47   HeapWord* allocate_inside_tlab_slow(Allocation& allocation) const;
  48   HeapWord* allocate_outside_tlab(Allocation& allocation) const;
  49 
  50 protected:
  51   MemAllocator(Klass* klass, size_t word_size, Thread* thread)
  52     : _thread(thread),
  53       _klass(klass),
  54       _word_size(word_size)
  55   { }
  56 
  57   // This function clears the memory of the object
  58   void mem_clear(HeapWord* mem) const;
  59   // This finish constructing an oop by installing the mark word and the Klass* pointer
  60   // last. At the point when the Klass pointer is initialized, this is a constructed object
  61   // that must be parseable as an oop by concurrent collectors.
  62   oop finish(HeapWord* mem) const;
  63 
  64   // Raw memory allocation. This may or may not use TLAB allocations to satisfy the
  65   // allocation. A GC implementation may override this function to satisfy the allocation
  66   // in any way. But the default is to try a TLAB allocation, and otherwise perform
  67   // mem_allocate.
  68   virtual HeapWord* mem_allocate(Allocation& allocation) const;
  69 
  70   virtual MemRegion obj_memory_range(oop obj) const {
  71     return MemRegion((HeapWord*)obj, _word_size);
  72   }
  73 
  74 public:
  75   oop allocate() const;
  76   virtual oop initialize(HeapWord* mem) const = 0;
  77 };
  78 




  38   class Allocation;
  39 
  40   Thread* const        _thread;
  41   Klass* const         _klass;
  42   const size_t         _word_size;
  43 
  44 private:
  45   // Allocate from the current thread's TLAB, with broken-out slow path.
  46   HeapWord* allocate_inside_tlab(Allocation& allocation) const;
  47   HeapWord* allocate_inside_tlab_slow(Allocation& allocation) const;
  48   HeapWord* allocate_outside_tlab(Allocation& allocation) const;
  49 
  50 protected:
  51   MemAllocator(Klass* klass, size_t word_size, Thread* thread)
  52     : _thread(thread),
  53       _klass(klass),
  54       _word_size(word_size)
  55   { }
  56 
  57   // This function clears the memory of the object
  58   virtual HeapWord* mem_clear(HeapWord* mem) const;
  59   // This finish constructing an oop by installing the mark word and the Klass* pointer
  60   // last. At the point when the Klass pointer is initialized, this is a constructed object
  61   // that must be parseable as an oop by concurrent collectors.
  62   oop finish(HeapWord* mem) const;
  63 
  64   // Raw memory allocation. This may or may not use TLAB allocations to satisfy the
  65   // allocation. A GC implementation may override this function to satisfy the allocation
  66   // in any way. But the default is to try a TLAB allocation, and otherwise perform
  67   // mem_allocate.
  68   virtual HeapWord* mem_allocate(Allocation& allocation) const;
  69 
  70   virtual MemRegion obj_memory_range(oop obj) const {
  71     return MemRegion((HeapWord*)obj, _word_size);
  72   }
  73 
  74 public:
  75   oop allocate() const;
  76   virtual oop initialize(HeapWord* mem) const = 0;
  77 };
  78 


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