48   size_t                  _nsegments;
  49   ZPhysicalMemorySegment* _segments;
  50 
  51 public:
  52   ZPhysicalMemory();
  53   ZPhysicalMemory(size_t size);
  54   ZPhysicalMemory(const ZPhysicalMemorySegment& segment);
  55 
  56   bool is_null() const;
  57   size_t size() const;
  58 
  59   size_t nsegments() const;
  60   ZPhysicalMemorySegment segment(size_t index) const;
  61   void add_segment(ZPhysicalMemorySegment segment);
  62 
  63   ZPhysicalMemory split(size_t size);
  64   void clear();
  65 };
  66 
  67 class ZPhysicalMemoryManager VALUE_OBJ_CLASS_SPEC {


  68 private:
  69   ZPhysicalMemoryBacking _backing;
  70   const size_t           _max_capacity;
  71   size_t                 _capacity;
  72   size_t                 _used;
  73 
  74   bool ensure_available(size_t size);
  75 
  76   void nmt_commit(ZPhysicalMemory pmem, uintptr_t offset);
  77   void nmt_uncommit(ZPhysicalMemory pmem, uintptr_t offset);
  78 
  79 public:
  80   ZPhysicalMemoryManager(size_t max_capacity, size_t granule_size);
  81 
  82   bool is_initialized() const;
  83 
  84   size_t max_capacity() const;
  85   size_t capacity() const;
  86   size_t used() const;
  87   size_t available() const;

  48   size_t                  _nsegments;
  49   ZPhysicalMemorySegment* _segments;
  50 
  51 public:
  52   ZPhysicalMemory();
  53   ZPhysicalMemory(size_t size);
  54   ZPhysicalMemory(const ZPhysicalMemorySegment& segment);
  55 
  56   bool is_null() const;
  57   size_t size() const;
  58 
  59   size_t nsegments() const;
  60   ZPhysicalMemorySegment segment(size_t index) const;
  61   void add_segment(ZPhysicalMemorySegment segment);
  62 
  63   ZPhysicalMemory split(size_t size);
  64   void clear();
  65 };
  66 
  67 class ZPhysicalMemoryManager VALUE_OBJ_CLASS_SPEC {
  68   friend class VMStructs;
  69 
  70 private:
  71   ZPhysicalMemoryBacking _backing;
  72   const size_t           _max_capacity;
  73   size_t                 _capacity;
  74   size_t                 _used;
  75 
  76   bool ensure_available(size_t size);
  77 
  78   void nmt_commit(ZPhysicalMemory pmem, uintptr_t offset);
  79   void nmt_uncommit(ZPhysicalMemory pmem, uintptr_t offset);
  80 
  81 public:
  82   ZPhysicalMemoryManager(size_t max_capacity, size_t granule_size);
  83 
  84   bool is_initialized() const;
  85 
  86   size_t max_capacity() const;
  87   size_t capacity() const;
  88   size_t used() const;
  89   size_t available() const;