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1 294 jeremybenn
-- FDB0A00.A
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--
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--                             Grant of Unlimited Rights
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--
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--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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--     unlimited rights in the software and documentation contained herein.
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--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
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--     this public release, the Government intends to confer upon all
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--     recipients unlimited rights  equal to those held by the Government.
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--     These rights include rights to use, duplicate, release or disclose the
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--     released technical data and computer software in whole or in part, in
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--     any manner and for any purpose whatsoever, and to have or permit others
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--     to do so.
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--
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--                                    DISCLAIMER
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--
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--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- FOUNDATION DESCRIPTION:
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--      This foundation provides the basis for testing package
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--      System.Storage_Pools.  It provides simple implementations of
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--      Allocate and Deallocate that have the side effect of calling
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--      TCTouch.Touch when they are called.
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--
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-- CHANGE HISTORY:
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--      02 JUN 95   SAIC   Initial version
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--      05 APR 96   SAIC   Fixed header for 2.1
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--      02 JUL 98   EDS    Swapped Pool.Avail change with overflow check
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--!
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---------------------------------------------------------------- FDB0A00
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with Report;
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with System.Storage_Pools;
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with System.Storage_Elements;
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package FDB0A00 is
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  type Stack_Heap( Water_Line: System.Storage_Elements.Storage_Count )
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     is new System.Storage_Pools.Root_Storage_Pool with private;
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  procedure Allocate(
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    Pool : in out Stack_Heap;
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    Storage_Address : out System.Address;
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    Size_In_Storage_Elements : in System.Storage_Elements.Storage_Count;
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    Alignment : in System.Storage_Elements.Storage_Count);
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  procedure Deallocate(
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    Pool : in out Stack_Heap;
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    Storage_Address : in System.Address;
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    Size_In_Storage_Elements : in System.Storage_Elements.Storage_Count;
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    Alignment : in System.Storage_Elements.Storage_Count);
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  function Storage_Size( Pool: in Stack_Heap )
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           return System.Storage_Elements.Storage_Count;
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  function TC_Largest_Request return System.Storage_Elements.Storage_Count;
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  Pool_Overflow : exception;
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private
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  type Data_Array is array(System.Storage_Elements.Storage_Count range <>)
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                     of System.Storage_Elements.Storage_Element;
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  type Stack_Heap( Water_Line: System.Storage_Elements.Storage_Count )
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     is new System.Storage_Pools.Root_Storage_Pool with record
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       Data  : Data_Array(1..Water_Line);
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       Avail : System.Storage_Elements.Storage_Count := 1;
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  end record;
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end FDB0A00;
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-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
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with TCTouch;
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package body FDB0A00 is
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  Largest_Request_On_Record : System.Storage_Elements.Storage_Count := 0;
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  procedure Allocate(
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    Pool : in out Stack_Heap;
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    Storage_Address : out System.Address;
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    Size_In_Storage_Elements : in System.Storage_Elements.Storage_Count;
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    Alignment : in System.Storage_Elements.Storage_Count) is
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      use type System.Storage_Elements.Storage_Offset;
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  begin
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    TCTouch.Touch('A');  --------------------------------------------------- A
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    -- set the pointer to the next correctly aligned available address
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    Pool.Avail := Pool.Avail
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                + (Alignment - (Pool.Data(Pool.Avail)'Address mod Alignment));
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    -- check for overflow
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    if Pool.Avail + Size_In_Storage_Elements > Pool.Water_Line then
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      raise Pool_Overflow;
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    end if;
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    -- set the resulting address to that address
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    Storage_Address := Pool.Data(Pool.Avail)'Address;
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    -- update the housekeeping
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    Pool.Avail := Pool.Avail + Size_In_Storage_Elements;
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    Largest_Request_On_Record
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      := System.Storage_Elements.Storage_Count'Max(Largest_Request_On_Record,
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                                                   Size_In_Storage_Elements);
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  exception
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    when Constraint_Error => raise Pool_Overflow;  -- in case I missed an edge
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  end Allocate;
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  procedure Deallocate(
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    Pool : in out Stack_Heap;
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    Storage_Address : in System.Address;
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    Size_In_Storage_Elements : in System.Storage_Elements.Storage_Count;
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    Alignment : in System.Storage_Elements.Storage_Count) is
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  begin
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    TCTouch.Touch('D');  --------------------------------------------------- D
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    -- for the purposes of validation, the simplest possible implementation
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    -- of Deallocate is shown below:
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    null;
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  end Deallocate;
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  function Storage_Size( Pool: in Stack_Heap )
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           return System.Storage_Elements.Storage_Count is
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  begin
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    TCTouch.Touch('S');  --------------------------------------------------- S
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    return Pool.Water_Line;
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  end Storage_Size;
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  function TC_Largest_Request return System.Storage_Elements.Storage_Count is
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  begin
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    return Largest_Request_On_Record;
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  end TC_Largest_Request;
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end FDB0A00;

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