File : s-poosiz.ads


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--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                     S Y S T E M . P O O L _ S I Z E                      --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--                            $Revision: 1.5 $                              --
--                                                                          --
--        Copyright (C) 1992,1993,1994 Free Software Foundation, Inc.       --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
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-- 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, --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--                                                                          --
------------------------------------------------------------------------------

with System.Storage_Pools;
with System.Storage_Elements;

package System.Pool_Size is

pragma Elaborate_Body;
--  Needed to ensure that library routines can execute allocators

   ------------------------
   -- Stack_Bounded_Pool --
   ------------------------

   --  Allocation strategy:

   --    Pool is a regular stack array, no use of malloc
   --    user specified size
   --    Space of pool is globally reclaimed by normal stack management

   --  Used in the compiler for access types with 'STORAGE_SIZE rep. clause
   --  Only used for allocating objects of the same type.

   type Stack_Bounded_Pool 
     (Pool_Size : System.Storage_Elements.Storage_Count; 
      Elmt_Size : System.Storage_Elements.Storage_Count; 
      Alignment : System.Storage_Elements.Storage_Count) 
   is
      new System.Storage_Pools.Root_Storage_Pool with record
         First_Free        : System.Storage_Elements.Storage_Count; 
         First_Empty       : System.Storage_Elements.Storage_Count; 
         Aligned_Elmt_Size : System.Storage_Elements.Storage_Count; 
         The_Pool          : System.Storage_Elements.Storage_Array 
                                                       (1 .. Pool_Size);
      end record;

   function Storage_Size 
     (Pool : Stack_Bounded_Pool) 
      return System.Storage_Elements.Storage_Count;

   procedure Allocate 
     (Pool         : in out Stack_Bounded_Pool; 
      Address      : out System.Address; 
      Storage_Size : System.Storage_Elements.Storage_Count; 
      Alignment    : System.Storage_Elements.Storage_Count); 

   procedure Deallocate 
     (Pool         : in out Stack_Bounded_Pool; 
      Address      : System.Address; 
      Storage_Size : System.Storage_Elements.Storage_Count; 
      Alignment    : System.Storage_Elements.Storage_Count); 

   procedure Initialize (Pool : in out Stack_Bounded_Pool); 

end System.Pool_Size;