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------------------------------------------------------------------------------

--                                                                          --

--                         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) 1992-2011, 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- 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.Memory;

package body System.Pool_Global is

   package SSE renames System.Storage_Elements;

   --------------

   -- Allocate --

   --------------

   overriding procedure Allocate

     (Pool         : in out Unbounded_No_Reclaim_Pool;

      Address      : out System.Address;

      Storage_Size : SSE.Storage_Count;

      Alignment    : SSE.Storage_Count)

   is

      use SSE;

      pragma Warnings (Off, Pool);

      Aligned_Size    : Storage_Count := Storage_Size;

      Aligned_Address : System.Address;

      Allocated       : System.Address;

   begin

      if Alignment > Standard'System_Allocator_Alignment then

         Aligned_Size := Aligned_Size + Alignment;

      end if;

      Allocated := Memory.Alloc (Memory.size_t (Aligned_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;

      end if;

      --  Case where alignment requested is greater than the alignment that is

      --  guaranteed to be provided by the system allocator.

      if Alignment > Standard'System_Allocator_Alignment then

         --  Realign the returned address

         Aligned_Address := To_Address

           (To_Integer (Allocated) + Integer_Address (Alignment)

              - (To_Integer (Allocated) mod Integer_Address (Alignment)));

         --  Save the block address

         declare

            Saved_Address : System.Address;

            pragma Import (Ada, Saved_Address);

            for Saved_Address'Address use

               Aligned_Address

               - Storage_Offset (System.Address'Size / Storage_Unit);

         begin

            Saved_Address := Allocated;

         end;

         Address := Aligned_Address;

      else

         Address := Allocated;

      end if;

   end Allocate;

   ----------------

   -- Deallocate --

   ----------------

   overriding procedure Deallocate

     (Pool         : in out Unbounded_No_Reclaim_Pool;

      Address      : System.Address;

      Storage_Size : SSE.Storage_Count;

      Alignment    : SSE.Storage_Count)

   is

      use System.Storage_Elements;

      pragma Warnings (Off, Pool);

      pragma Warnings (Off, Storage_Size);

   begin

      --  Case where the alignment of the block exceeds the guaranteed

      --  alignment required by the system storage allocator, meaning that

      --  this was specially wrapped at allocation time.

      if Alignment > Standard'System_Allocator_Alignment then

         --  Retrieve the block address

         declare

            Saved_Address : System.Address;

            pragma Import (Ada, Saved_Address);

            for Saved_Address'Address use

              Address - Storage_Offset (System.Address'Size / Storage_Unit);

         begin

            Memory.Free (Saved_Address);

         end;

      else

         Memory.Free (Address);

      end if;

   end Deallocate;

   ------------------

   -- Storage_Size --

   ------------------

   overriding 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;