------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                   S Y S T E M . P O O L _ G L O B A L                    --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2001, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
-- MA 02111-1307, USA.                                                      --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with System.Storage_Pools;    use System.Storage_Pools;
with System.Storage_Elements;
with System.Memory;

package body System.Pool_Global is

   package SSE renames System.Storage_Elements;

   --------------
   -- Allocate --
   --------------

   procedure Allocate
     (Pool         : in out Unbounded_No_Reclaim_Pool;
      Address      : out System.Address;
      Storage_Size : SSE.Storage_Count;
      Alignment    : SSE.Storage_Count)
   is
      pragma Warnings (Off, Pool);
      pragma Warnings (Off, Alignment);

      Allocated : System.Address;

   begin
      Allocated := Memory.Alloc (Memory.size_t (Storage_Size));

      --  The call to Alloc returns an address whose alignment is compatible
      --  with the worst case alignment requirement for the machine; thus the
      --  Alignment argument can be safely ignored.

      if Allocated = Null_Address then
         raise Storage_Error;
      else
         Address := Allocated;
      end if;
   end Allocate;

   ----------------
   -- Deallocate --
   ----------------

   procedure Deallocate
     (Pool         : in out Unbounded_No_Reclaim_Pool;
      Address      : System.Address;
      Storage_Size : SSE.Storage_Count;
      Alignment    : SSE.Storage_Count)
   is
      pragma Warnings (Off, Pool);
      pragma Warnings (Off, Storage_Size);
      pragma Warnings (Off, Alignment);

   begin
      Memory.Free (Address);
   end Deallocate;

   ------------------
   -- Storage_Size --
   ------------------

   function Storage_Size
     (Pool  : Unbounded_No_Reclaim_Pool)
      return  SSE.Storage_Count
   is
      pragma Warnings (Off, Pool);

   begin
      --  Intuitively, should return System.Memory_Size. But on Sun/Alsys,
      --  System.Memory_Size > System.Max_Int, which means all you can do with
      --  it is raise CONSTRAINT_ERROR...

      return SSE.Storage_Count'Last;
   end Storage_Size;

end System.Pool_Global;
