32 private:
  33   uintptr_t _start;
  34   uintptr_t _end;
  35 
  36 public:
  37   ZVirtualMemory();
  38   ZVirtualMemory(uintptr_t start, size_t size);
  39 
  40   bool is_null() const;
  41   uintptr_t start() const;
  42   uintptr_t end() const;
  43   size_t size() const;
  44 
  45   ZVirtualMemory split(size_t size);
  46 };
  47 
  48 class ZVirtualMemoryManager {
  49 private:
  50   ZMemoryManager _manager;
  51   bool           _initialized;

  52 
  53   void initialize_os();
  54 
  55   bool reserve_contiguous_platform(uintptr_t start, size_t size);
  56   bool reserve_contiguous(size_t size);
  57   size_t reserve_discontiguous(uintptr_t start, size_t size, size_t min_range);
  58   size_t reserve_discontiguous(size_t size);
  59   bool reserve(size_t max_capacity);
  60 
  61   void nmt_reserve(uintptr_t start, size_t size);
  62 
  63 public:
  64   ZVirtualMemoryManager(size_t max_capacity);
  65 
  66   bool is_initialized() const;
  67 
  68   ZVirtualMemory alloc(size_t size, bool force_low_address);
  69   void free(const ZVirtualMemory& vmem);
  70 };
  71 

  32 private:
  33   uintptr_t _start;
  34   uintptr_t _end;
  35 
  36 public:
  37   ZVirtualMemory();
  38   ZVirtualMemory(uintptr_t start, size_t size);
  39 
  40   bool is_null() const;
  41   uintptr_t start() const;
  42   uintptr_t end() const;
  43   size_t size() const;
  44 
  45   ZVirtualMemory split(size_t size);
  46 };
  47 
  48 class ZVirtualMemoryManager {
  49 private:
  50   ZMemoryManager _manager;
  51   bool           _initialized;
  52   size_t         _address_bits_seen;
  53 
  54   void initialize_os();
  55 
  56   bool reserve_contiguous_platform(uintptr_t start, size_t size);
  57   bool reserve_contiguous(size_t size);
  58   size_t reserve_discontiguous(uintptr_t start, size_t size, size_t min_range);
  59   size_t reserve_discontiguous(size_t size);
  60   bool reserve(size_t max_capacity);
  61 
  62   void nmt_reserve(uintptr_t start, size_t size);
  63 
  64 public:
  65   ZVirtualMemoryManager(size_t max_capacity);
  66 
  67   bool is_initialized() const;
  68 
  69   ZVirtualMemory alloc(size_t size, bool force_low_address);
  70   void free(const ZVirtualMemory& vmem);
  71 };
  72