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-- CC54004.A
--
-- Grant of Unlimited Rights
--
-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
-- unlimited rights in the software and documentation contained herein.
-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
-- this public release, the Government intends to confer upon all
-- recipients unlimited rights equal to those held by the Government.
-- These rights include rights to use, duplicate, release or disclose the
-- released technical data and computer software in whole or in part, in
-- any manner and for any purpose whatsoever, and to have or permit others
-- to do so.
--
-- DISCLAIMER
--
-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
-- PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
-- Check that the designated type of a generic formal pool-specific
-- access type may be class-wide. Check that calls to primitive
-- subprograms in the instance dispatch to the appropriate bodies when
-- the controlling operand is a dereference of an object of the access-
-- to-class-wide type.
--
-- TEST DESCRIPTION:
-- A hierarchy of types is declared in two packages. The root type of
-- the class is declared as abstract in a separate package. It possesses
-- an abstract primitive subprogram Handle. A concrete type extends the
-- root type in a second package with a component of an enumeration type.
-- A second type extends this extension in the same package. Both
-- derivatives override the root type's primitive subprogram with a
-- non-abstract subprogram.
--
-- The generic implements a heterogeneous stack of access-to-class-wide
-- objects in the root type's class. A subprogram declared in the
-- generic calls Handle using dereferences of each of the class-wide
-- objects on the stack as operand. Each call to Handle should dispatch
-- to the appropriate body based on the tag of the operand. The
-- overriding versions of Handle each set the component of the type to
-- a different value. The value of the component is checked to verify
-- that the calls dispatched correctly.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
-- 10 Apr 96 SAIC ACVC 2.1: Added pragma Elaborate to context clause
-- preceding CC54004_3.
--
--!
package CC54004_0 is
-- The types and operations defined here are artificial. The component
-- TC_Code is the only component required for testing purposes.
type TC_Code_Type is (None, Low, Medium);
type Alert is abstract tagged record -- Abstract type.
TC_Code : TC_Code_Type; -- Testing flag.
end record;
procedure Handle (A : in out Alert); -- Non-abstract primitive
-- subprogram.
-- ...Other operations.
type Alert_Ptr is access Alert'Class; -- Access-to-class-wide
-- type.
end CC54004_0;
--===================================================================--
package body CC54004_0 is
procedure Handle (A : in out Alert) is
begin
A.TC_Code := None;
end Handle;
end CC54004_0;
--===================================================================--
with CC54004_0;
use CC54004_0;
package CC54004_1 is
type Low_Alert is new CC54004_0.Alert with record
C1 : String (1 .. 5) := "Dummy";
-- ...Other components.
end record;
procedure Handle (A : in out Low_Alert); -- Overrides parent's
-- operations.
--...Other operations.
type Medium_Alert is new Low_Alert with record
C : Integer := 6;
-- ...Other components.
end record;
procedure Handle (A : in out Medium_Alert); -- Overrides parent's
-- operations.
--...Other operations.
end CC54004_1;
--===================================================================--
package body CC54004_1 is
procedure Handle (A : in out Low_Alert) is
begin
A.TC_Code := Low;
end Handle;
procedure Handle (A : in out Medium_Alert) is
begin
A.TC_Code := Medium;
end Handle;
end CC54004_1;
--===================================================================--
with CC54004_0;
generic
type Element_Type is abstract new CC54004_0.Alert with private;
type Element_Ptr is access Element_Type'Class;
package CC54004_2 is
type Stack_Type is private;
procedure Push (Stack : in out Stack_Type;
Elem_Ptr : in Element_Ptr);
procedure Pop (Stack : in out Stack_Type;
Elem_Ptr : out Element_Ptr);
procedure Process_Stack (Stack : in out Stack_Type);
-- ... Other operations.
private
subtype Index is Positive range 1 .. 5;
type Stack_Type is array (Index) of Element_Ptr;
Top : Index := 1;
end CC54004_2;
--===================================================================--
package body CC54004_2 is
procedure Push (Stack : in out Stack_Type;
Elem_Ptr : in Element_Ptr) is
begin
Stack(Top) := Elem_Ptr;
Top := Top + 1; -- Artificial: no Constraint_Error protection.
end Push;
procedure Pop (Stack : in out Stack_Type;
Elem_Ptr : out Element_Ptr)is
begin
Top := Top - 1; -- Artificial: no Constraint_Error protection.
Elem_Ptr := Stack(Top);
end Pop;
-- Call Handle for each element on the stack. Since the dereferenced access
-- object is of a class-wide type, all calls to Handle are dispatching. The
-- version of Handle called will be that declared for the type
-- corresponding to the tag of the operand.
procedure Process_Stack (Stack : in out Stack_Type) is
begin -- Artificial: no Constraint_Error protection.
for I in reverse Index'First .. (Top - 1) loop
Handle (Stack(I).all); -- Call dispatches based on
end loop; -- tag of operand.
end Process_Stack;
end CC54004_2;
--===================================================================--
with CC54004_0;
with CC54004_1;
with CC54004_2;
pragma Elaborate (CC54004_2);
package CC54004_3 is
package Alert_Stacks is new CC54004_2 (Element_Type => CC54004_0.Alert,
Element_Ptr => CC54004_0.Alert_Ptr);
-- All overriding versions of Handle visible at the point of instantiation.
Alert_List : Alert_Stacks.Stack_Type;
procedure TC_Create_Alert_Stack;
end CC54004_3;
--===================================================================--
package body CC54004_3 is
procedure TC_Create_Alert_Stack is
begin
Alert_Stacks.Push (Alert_List, new CC54004_1.Low_Alert);
Alert_Stacks.Push (Alert_List, new CC54004_1.Medium_Alert);
end TC_Create_Alert_Stack;
end CC54004_3;
--===================================================================--
with CC54004_0;
with CC54004_1;
with CC54004_3;
with Report;
procedure CC54004 is
TC_Low_Ptr, TC_Med_Ptr : CC54004_0.Alert_Ptr;
TC_Low_Actual : CC54004_1.Low_Alert;
TC_Med_Actual : CC54004_1.Medium_Alert;
use type CC54004_0.TC_Code_Type;
begin
Report.Test ("CC54004", "Check that the designated type of a generic " &
"formal pool-specific access type may be class-wide");
-- Create stack of elements:
CC54004_3.TC_Create_Alert_Stack;
-- Commence dispatching operations on stack elements:
CC54004_3.Alert_Stacks.Process_Stack (CC54004_3.Alert_List);
-- Pop "handled" alerts off stack:
CC54004_3.Alert_Stacks.Pop (CC54004_3.Alert_List, TC_Med_Ptr);
CC54004_3.Alert_Stacks.Pop (CC54004_3.Alert_List, TC_Low_Ptr);
-- Verify results:
if TC_Low_Ptr.all not in CC54004_1.Low_Alert or else
TC_Med_Ptr.all not in CC54004_1.Medium_Alert
then
Report.Failed ("Class-wide objects do not have expected tags");
-- The explicit dereference of the "Pop"ed pointers results in views of
-- the designated objects, the nominal subtypes of which are class-wide.
-- In order to be able to reference the component TC_Code, these views
-- must be converted to a specific type possessing that component.
elsif CC54004_1.Low_Alert(TC_Low_Ptr.all).TC_Code /= CC54004_0.Low or
CC54004_1.Medium_Alert(TC_Med_Ptr.all).TC_Code /= CC54004_0.Medium
then
Report.Failed ("Calls did not dispatch to expected operations");
end if;
Report.Result;
end CC54004;
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