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-- CB20003.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 exceptions can be raised, reraised, and handled in an
-- accessed subprogram.
--
--
-- TEST DESCRIPTION:
-- Declare a record type, with one component being an access to
-- subprogram type. Various subprograms are defined to fit the profile
-- of this access type, such that the record component can refer to
-- any of the subprograms.
--
-- Each of the subprograms raises a different exception, based on the
-- value of an input parameter. Exceptions are 1) raised, handled with
-- an others handler, reraised and propagated to main to be handled in
-- a specific handler; 2) raised, handled in a specific handler, reraised
-- and propagated to the main to be handled in an others handler there,
-- and 3) raised and propagated directly to the caller by the subprogram.
--
-- Boolean variables are set throughout the test to ensure that correct
-- exception processing has occurred, and these variables are verified at
-- the conclusion of the test.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package CB20003_0 is -- package Push_Buttons
Non_Default_Priority,
Non_Alert_Priority,
Non_Emergency_Priority : exception;
Handled_With_Others,
Reraised_In_Subprogram,
Handled_In_Caller : Boolean := False;
subtype Priority_Type is Integer range 1 .. 10;
Default_Priority : Priority_Type := 1;
Alert_Priority : Priority_Type := 3;
Emergency_Priority : Priority_Type := 5;
type Button is tagged private; -- Private tagged type.
type Button_Response_Ptr is access procedure (P : in Priority_Type;
B : in out Button);
-- Procedures accessible with Button_Response_Ptr type.
procedure Default_Response (P : in Priority_Type;
B : in out Button);
procedure Alert_Response (P : in Priority_Type;
B : in out Button);
procedure Emergency_Response (P : in Priority_Type;
B : in out Button);
procedure Push (B : in out Button;
P : in Priority_Type);
procedure Set_Response (B : in out Button;
R : in Button_Response_Ptr);
private
type Button is tagged
record
Priority : Priority_Type := Default_Priority;
Response : Button_Response_Ptr := Default_Response'Access;
end record;
end CB20003_0; -- package Push_Buttons
--=================================================================--
with Report;
package body CB20003_0 is -- package Push_Buttons
procedure Push (B : in out Button;
P : in Priority_Type) is
begin -- Invoking subprogram designated
B.Response (P, B); -- by access value.
end Push;
procedure Set_Response (B : in out Button;
R : in Button_Response_Ptr) is
begin
B.Response := R; -- Set procedure value in record
end Set_Response;
procedure Default_Response (P : in Priority_Type;
B : in out Button) is
begin
if (P > Default_Priority) then
raise Non_Default_Priority;
Report.Failed ("Exception not raised in procedure body");
else
B.Priority := P;
end if;
exception
when others => -- Catch exception with others handler
Handled_With_Others := True; -- Successfully caught with "others"
raise;
Report.Failed ("Exception not reraised in handler");
end Default_Response;
procedure Alert_Response (P : in Priority_Type;
B : in out Button) is
begin
if (P > Alert_Priority) then
raise Non_Alert_Priority;
Report.Failed ("Exception not raised in procedure body");
else
B.Priority := P;
end if;
exception
when Non_Alert_Priority =>
Reraised_In_Subprogram := True;
raise; -- Propagate to caller.
Report.Failed ("Exception not reraised in procedure excpt handler");
when others =>
Report.Failed ("Incorrect exception raised/handled");
end Alert_Response;
procedure Emergency_Response (P : in Priority_type;
B : in out Button) is
begin
if (P > Emergency_Priority) then
raise Non_Emergency_Priority;
Report.Failed ("Exception not raised in procedure body");
else
B.Priority := P;
end if;
-- No exception handler here, exception will be propagated to caller.
end Emergency_Response;
end CB20003_0; -- package Push_Buttons
--=================================================================--
with Report;
with CB20003_0; -- package Push_Buttons
procedure CB20003 is
package Push_Buttons renames CB20003_0;
Console_Button : Push_Buttons.Button;
begin
Report.Test ("CB20003", "Check that exceptions can be raised, " &
"reraised, and handled in a subprogram " &
"referenced by an access to subprogram value");
Default_Response_Processing: -- The exception
-- Handled_With_Others is to
-- be caught with an others
-- handler in Default_Resp.,
-- reraised, and handled with
-- a specific handler here.
begin
Push_Buttons.Push (Console_Button, -- Raise exception that will
Report.Ident_Int(2)); -- be handled in procedure.
exception
when Push_Buttons.Non_Default_Priority =>
if not Push_Buttons.Handled_With_Others then -- Not reraised in
-- procedure.
Report.Failed
("Exception not handled/reraised in procedure");
end if;
when others =>
Report.Failed ("Exception handled in " &
" Default_Response_Processing block");
end Default_Response_Processing;
Alert_Response_Processing:
begin
Push_Buttons.Set_Response (Console_Button,
Push_Buttons.Alert_Response'access);
Push_Buttons.Push (Console_Button, -- Raise exception that will
Report.Ident_Int(4)); -- be handled in procedure,
-- reraised, and propagated
-- to caller.
Report.Failed ("Exception not propagated to caller " &
"in Alert_Response_Processing block");
exception
when Push_Buttons.Non_Alert_Priority =>
if not Push_Buttons.Reraised_In_Subprogram then -- Not reraised in
-- procedure.
Report.Failed ("Exception not reraised in procedure");
end if;
when others =>
Report.Failed ("Exception handled in " &
" Alert_Response_Processing block");
end Alert_Response_Processing;
Emergency_Response_Processing:
begin
Push_Buttons.Set_Response (Console_Button,
Push_Buttons.Emergency_Response'access);
Push_Buttons.Push (Console_Button, -- Raise exception that will
Report.Ident_Int(6)); -- be propagated directly to
-- caller.
Report.Failed ("Exception not propagated to caller " &
"in Emergency_Response_Processing block");
exception
when Push_Buttons.Non_Emergency_Priority =>
Push_Buttons.Handled_In_Caller := True;
when others =>
Report.Failed ("Exception handled in " &
" Emergency_Response_Processing block");
end Emergency_Response_Processing;
if not (Push_Buttons.Handled_With_Others and
Push_Buttons.Reraised_In_Subprogram and
Push_Buttons.Handled_In_Caller )
then
Report.Failed ("Incorrect exception handling in referenced subprograms");
end if;
Report.Result;
end CB20003;
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