614 // Helper class to allocate arrays that may become large.

   615 // Uses the OS malloc for allocations smaller than ArrayAllocatorMallocLimit

   616 // and uses mapped memory for larger allocations.

   617 // Most OS mallocs do something similar but Solaris malloc does not revert

   618 // to mapped memory for large allocations. By default ArrayAllocatorMallocLimit

   619 // is set so that we always use malloc except for Solaris where we set the

   620 // limit to get mapped memory.

   621 template <class E, MEMFLAGS F>

   622 class ArrayAllocator : StackObj {

   623   char* _addr;

   624   bool _use_malloc;

   625   size_t _size;

   626  public:

   627   ArrayAllocator() : _addr(NULL), _use_malloc(false), _size(0) { }

   628   ~ArrayAllocator() { free(); }

   629   E* allocate(size_t length);

   630   void free();

   631 };

   632