74   // Indicates whether the committed space should be executable.
  75   bool _executable;
  76 
  77   // Helper function for committing memory. Commit the given memory range by using
  78   // _page_size pages as much as possible and the remainder with small sized pages.
  79   void commit_internal(size_t start_page, size_t end_page);
  80   // Commit num_pages pages of _page_size size starting from start. All argument
  81   // checking has been performed.
  82   void commit_preferred_pages(size_t start_page, size_t end_page);
  83   // Commit space at the high end of the space that needs to be committed with small
  84   // sized pages.
  85   void commit_tail();
  86 
  87   // Uncommit the given memory range.
  88   void uncommit_internal(size_t start_page, size_t end_page);
  89 
  90   // Pretouch the given memory range.
  91   void pretouch_internal(size_t start_page, size_t end_page);
  92 
  93   // Returns the index of the page which contains the given address.
  94   uintptr_t  addr_to_page_index(char* addr) const;
  95   // Returns the address of the given page index.
  96   char*  page_start(size_t index) const;
  97 
  98   // Is the given page index the last page?
  99   bool is_last_page(size_t index) const { return index == (_committed.size() - 1); }
 100   // Is the given page index the first after last page?
 101   bool is_after_last_page(size_t index) const;
 102   // Is the last page only partially covered by this space?
 103   bool is_last_page_partial() const { return !is_aligned(_high_boundary, _page_size); }
 104   // Returns the end address of the given page bounded by the reserved space.
 105   char* bounded_end_addr(size_t end_page) const;
 106 
 107   // Returns true if the entire area is backed by committed memory.
 108   bool is_area_committed(size_t start_page, size_t size_in_pages) const;
 109   // Returns true if the entire area is not backed by committed memory.
 110   bool is_area_uncommitted(size_t start_page, size_t size_in_pages) const;
 111 
 112   void initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size);
 113  public:
 114 

  74   // Indicates whether the committed space should be executable.
  75   bool _executable;
  76 
  77   // Helper function for committing memory. Commit the given memory range by using
  78   // _page_size pages as much as possible and the remainder with small sized pages.
  79   void commit_internal(size_t start_page, size_t end_page);
  80   // Commit num_pages pages of _page_size size starting from start. All argument
  81   // checking has been performed.
  82   void commit_preferred_pages(size_t start_page, size_t end_page);
  83   // Commit space at the high end of the space that needs to be committed with small
  84   // sized pages.
  85   void commit_tail();
  86 
  87   // Uncommit the given memory range.
  88   void uncommit_internal(size_t start_page, size_t end_page);
  89 
  90   // Pretouch the given memory range.
  91   void pretouch_internal(size_t start_page, size_t end_page);
  92 
  93   // Returns the index of the page which contains the given address.
  94   size_t  addr_to_page_index(char* addr) const;
  95   // Returns the address of the given page index.
  96   char*  page_start(size_t index) const;
  97 
  98   // Is the given page index the last page?
  99   bool is_last_page(size_t index) const { return index == (_committed.size() - 1); }
 100   // Is the given page index the first after last page?
 101   bool is_after_last_page(size_t index) const;
 102   // Is the last page only partially covered by this space?
 103   bool is_last_page_partial() const { return !is_aligned(_high_boundary, _page_size); }
 104   // Returns the end address of the given page bounded by the reserved space.
 105   char* bounded_end_addr(size_t end_page) const;
 106 
 107   // Returns true if the entire area is backed by committed memory.
 108   bool is_area_committed(size_t start_page, size_t size_in_pages) const;
 109   // Returns true if the entire area is not backed by committed memory.
 110   bool is_area_uncommitted(size_t start_page, size_t size_in_pages) const;
 111 
 112   void initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size);
 113  public:
 114