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1 294 jeremybenn
-- CC54003.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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-- OBJECTIVE:
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--      Check that a general access-to-subprogram type may be passed as an
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--      actual to a generic formal access-to-subprogram type. Check that
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--      designated subprograms may be called by dereferencing the access
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--      values.
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--
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-- TEST DESCRIPTION:
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--      The generic implements a stack of access-to-subprogram objects as an
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--      array. The profile of the access-to-subprogram formal corresponds to
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--      a function which accepts a parameter of some type and returns an
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--      object of the same type.
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--
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--      For this test, the functions for which access values will be pushed
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--      onto the stack accept a parameter of type access-to-string, lengthen
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--      the pointed-to string, then return an access object pointing to this
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--      lengthened string.
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--
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--      The instance declares a function Execute_Stack which executes each
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--      subprogram on the stack in sequence. This function accepts some initial
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--      access-to-string, then returns an access object pointing to the
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--      lengthened string resulting from the execution of the stacked
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--      subprograms. Access-to-string objects are used rather than strings
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--      themselves because the initial string "grows" during each iteration.
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--
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--
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-- CHANGE HISTORY:
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--      06 Dec 94   SAIC    ACVC 2.0
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--      10 Apr 96   SAIC    ACVC 2.1: Added pragma Elaborate to context clause
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--                          preceding CC54003_2.
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--
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--!
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generic
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   Size : in Positive;
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   type Item_Type (<>) is private;
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   type Item_Ptr is access Item_Type;
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   type Function_Ptr is access function (Item : Item_Ptr)
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     return Item_Ptr;
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package CC54003_0 is -- Generic stack of pointers.
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   type Stack_Type is private;
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   procedure Push (Stack    : in out Stack_Type;
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                   Func_Ptr : in     Function_Ptr);
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   function Execute_Stack (Stack         : Stack_Type;
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                           Initial_Input : Item_Ptr) return Item_Ptr;
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   -- ... Other operations.
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private
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   subtype Index is Positive range 1 .. (Size + 1);
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   type Stack_Type is array (Index) of Function_Ptr;       -- Last slot unused.
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   Top : Index := 1;                  -- Top refers to the next available slot.
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end CC54003_0;
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     --===================================================================--
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package body CC54003_0 is
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   procedure Push (Stack    : in out Stack_Type;
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                   Func_Ptr : in     Function_Ptr) is
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   begin
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      Stack(Top) := Func_Ptr;
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      Top := Top + 1;     -- Artificial: no Constraint_Error protection.
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   end Push;
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   -- Call each subprogram on the stack in sequence. For the first call, pass
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   -- Initial_Input. For succeeding calls, pass the result of the previous
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   -- call.
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   function Execute_Stack (Stack         : Stack_Type;
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                           Initial_Input : Item_Ptr) return Item_Ptr is
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      Result : Item_Ptr := Initial_Input;
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   begin
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      for I in reverse Index'First .. (Top - 1) loop    -- Artificial: no C_E
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         Result := Stack(I)(Result);                    -- protection.
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      end loop;
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      return Result;
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   end Execute_Stack;
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end CC54003_0;
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     --===================================================================--
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package CC54003_1 is
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   subtype Message     is String;
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   type    Message_Ptr is access Message;
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   function Add_Prefix (Msg_Ptr : Message_Ptr) return Message_Ptr;
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   function Add_Suffix (Msg_Ptr : Message_Ptr) return Message_Ptr;
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   -- ...Other operations.
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end CC54003_1;
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     --===================================================================--
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package body CC54003_1 is
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   function Add_Prefix (Msg_Ptr : Message_Ptr) return Message_Ptr is
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      Sender  : constant String := "Dummy: ";    -- Artificial; in a real
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                                                 -- application Sender might
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      New_Msg : Message := Sender & Msg_Ptr.all; -- be a call to a function.
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   begin
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      return new Message'(New_Msg);
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   end Add_Prefix;
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   function Add_Suffix (Msg_Ptr : Message_Ptr) return Message_Ptr is
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      Time : constant String := " (12:03pm)";    -- Artificial; in a real
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                                                 -- application Time might be a
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      New_Msg : Message := Msg_Ptr.all & Time;   -- be a call to a function.
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   begin
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      return new Message'(New_Msg);
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   end Add_Suffix;
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end CC54003_1;
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     --===================================================================--
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with CC54003_0;      -- Generic stack of pointers.
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pragma Elaborate (CC54003_0);
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with CC54003_1;      -- Message abstraction.
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package CC54003_2 is
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   type Operation_Ptr is access function (Msg_Ptr : CC54003_1.Message_Ptr)
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     return CC54003_1.Message_Ptr;
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   Maximum_Ops : constant := 4;         -- Arbitrary.
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   package Stack_of_Ops is new CC54003_0
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     (Item_Type    => CC54003_1.Message,
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      Item_Ptr     => CC54003_1.Message_Ptr,
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      Function_Ptr => Operation_Ptr,
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      Size         => Maximum_Ops);
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   Operation_Stack : Stack_Of_Ops.Stack_Type;
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   procedure Create_Operation_Stack;
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end CC54003_2;
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     --===================================================================--
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package body CC54003_2 is
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   procedure Create_Operation_Stack is
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   begin
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      Stack_Of_Ops.Push (Operation_Stack, CC54003_1.Add_Prefix'Access);
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      Stack_Of_Ops.Push (Operation_Stack, CC54003_1.Add_Suffix'Access);
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   end Create_Operation_Stack;
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end CC54003_2;
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     --===================================================================--
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with CC54003_1;  -- Message abstraction.
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with CC54003_2;  -- Message-operation stack.
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with Report;
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procedure CC54003 is
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   package Msg_Ops renames CC54003_2.Stack_Of_Ops;
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   Msg      : CC54003_1.Message_Ptr := new CC54003_1.Message'("Hello there");
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   Expected : CC54003_1.Message     := "Dummy: Hello there (12:03pm)";
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begin
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   Report.Test ("CC54003", "Check that a general access-to-subprogram type " &
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                           "may be passed as an actual to a generic formal " &
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                           "access-to-subprogram type");
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   CC54003_2.Create_Operation_Stack;
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   declare
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      Actual : CC54003_1.Message_Ptr :=
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        Msg_Ops.Execute_Stack (CC54003_2.Operation_Stack, Msg);
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   begin
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      if Actual.all /= Expected then
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         Report.Failed ("Wrong result from dereferenced subprogram execution");
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      end if;
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   end;
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   Report.Result;
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end CC54003;

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