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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [s-pooglo.adb] - Blame information for rev 706

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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                   S Y S T E M . P O O L _ G L O B A L                    --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 1992-2011, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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with System.Storage_Pools; use System.Storage_Pools;
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with System.Memory;
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package body System.Pool_Global is
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   package SSE renames System.Storage_Elements;
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   --------------
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   -- Allocate --
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   --------------
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   overriding procedure Allocate
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     (Pool         : in out Unbounded_No_Reclaim_Pool;
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      Address      : out System.Address;
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      Storage_Size : SSE.Storage_Count;
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      Alignment    : SSE.Storage_Count)
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   is
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      use SSE;
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      pragma Warnings (Off, Pool);
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      Aligned_Size    : Storage_Count := Storage_Size;
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      Aligned_Address : System.Address;
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      Allocated       : System.Address;
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   begin
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      if Alignment > Standard'System_Allocator_Alignment then
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         Aligned_Size := Aligned_Size + Alignment;
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      end if;
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      Allocated := Memory.Alloc (Memory.size_t (Aligned_Size));
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      --  The call to Alloc returns an address whose alignment is compatible
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      --  with the worst case alignment requirement for the machine; thus the
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      --  Alignment argument can be safely ignored.
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      if Allocated = Null_Address then
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         raise Storage_Error;
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      end if;
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      --  Case where alignment requested is greater than the alignment that is
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      --  guaranteed to be provided by the system allocator.
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      if Alignment > Standard'System_Allocator_Alignment then
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         --  Realign the returned address
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         Aligned_Address := To_Address
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           (To_Integer (Allocated) + Integer_Address (Alignment)
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              - (To_Integer (Allocated) mod Integer_Address (Alignment)));
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         --  Save the block address
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         declare
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            Saved_Address : System.Address;
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            pragma Import (Ada, Saved_Address);
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            for Saved_Address'Address use
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               Aligned_Address
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               - Storage_Offset (System.Address'Size / Storage_Unit);
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         begin
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            Saved_Address := Allocated;
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         end;
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         Address := Aligned_Address;
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      else
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         Address := Allocated;
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      end if;
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   end Allocate;
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   ----------------
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   -- Deallocate --
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   ----------------
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   overriding procedure Deallocate
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     (Pool         : in out Unbounded_No_Reclaim_Pool;
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      Address      : System.Address;
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      Storage_Size : SSE.Storage_Count;
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      Alignment    : SSE.Storage_Count)
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   is
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      use System.Storage_Elements;
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      pragma Warnings (Off, Pool);
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      pragma Warnings (Off, Storage_Size);
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   begin
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      --  Case where the alignment of the block exceeds the guaranteed
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      --  alignment required by the system storage allocator, meaning that
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      --  this was specially wrapped at allocation time.
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      if Alignment > Standard'System_Allocator_Alignment then
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         --  Retrieve the block address
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         declare
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            Saved_Address : System.Address;
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            pragma Import (Ada, Saved_Address);
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            for Saved_Address'Address use
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              Address - Storage_Offset (System.Address'Size / Storage_Unit);
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         begin
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            Memory.Free (Saved_Address);
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         end;
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      else
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         Memory.Free (Address);
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      end if;
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   end Deallocate;
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   ------------------
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   -- Storage_Size --
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   ------------------
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   overriding function Storage_Size
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     (Pool  : Unbounded_No_Reclaim_Pool)
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      return  SSE.Storage_Count
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   is
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      pragma Warnings (Off, Pool);
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   begin
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      --  Intuitively, should return System.Memory_Size. But on Sun/Alsys,
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      --  System.Memory_Size > System.Max_Int, which means all you can do with
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      --  it is raise CONSTRAINT_ERROR...
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      return SSE.Storage_Count'Last;
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   end Storage_Size;
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end System.Pool_Global;

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