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|
-- CB20004.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 propagate correctly from objects of
-- protected types. Check propagation from protected entry bodies.
--
-- TEST DESCRIPTION:
-- Declare a package with a protected type, including entries and private
-- data, simulating a bounded buffer abstraction. In the main procedure,
-- perform entry calls on an object of the protected type that raises
-- exceptions.
-- Ensure that the exceptions are:
-- 1) raised and handled locally in the entry body
-- 2) raised in the entry body and handled/reraised to be handled
-- by the caller.
-- 3) raised in the entry body and propagated directly to the calling
-- procedure.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package CB20004_0 is -- Package Buffer.
Max_Buffer_Size : constant := 2;
Handled_In_Body,
Propagated_To_Caller,
Handled_In_Caller : Boolean := False;
Data_Over_5,
Data_Degradation : exception;
type Data_Item is range 0 .. 100;
type Item_Array_Type is array (1 .. Max_Buffer_Size) of Data_Item;
protected type Bounded_Buffer is
entry Put (Item : in Data_Item);
entry Get (Item : out Data_Item);
private
Item_Array : Item_Array_Type;
I, J : Integer range 1 .. Max_Buffer_Size := 1;
Count : Integer range 0 .. Max_Buffer_Size := 0;
end Bounded_Buffer;
end CB20004_0;
--=================================================================--
with Report;
package body CB20004_0 is -- Package Buffer.
protected body Bounded_Buffer is
entry Put (Item : in Data_Item) when Count < Max_Buffer_Size is
begin
if Item > 10 then
Item_Array (I) := Item * 8; -- Constraint_Error will be raised
elsif Item > 5 then -- and handled in entry body.
raise Data_Over_5; -- Exception handled/reraised in
else -- entry body, propagated to caller.
Item_Array (I) := Item; -- Store data item in buffer.
I := (I mod Max_Buffer_Size) + 1;
Count := Count + 1;
end if;
exception
when Constraint_Error =>
Handled_In_Body := True;
when Data_Over_5 =>
Propagated_To_Caller := True;
raise; -- Propagate the exception to the caller.
end Put;
entry Get (Item : out Data_Item) when Count > 0 is
begin
Item := Item_Array(J);
J := (J mod Max_Buffer_Size) + 1;
Count := Count - 1;
if Count = 0 then
raise Data_Degradation; -- Exception to propagate to caller.
end if;
end Get;
end Bounded_Buffer;
end CB20004_0;
--=================================================================--
with CB20004_0; -- Package Buffer.
with Report;
procedure CB20004 is
package Buffer renames CB20004_0;
Data : Buffer.Data_Item := Buffer.Data_Item'First;
Data_Buffer : Buffer.Bounded_Buffer; -- an object of protected type.
Handled_In_Caller : Boolean := False; -- same name as boolean declared
-- in package Buffer.
begin
Report.Test ("CB20004", "Check that exceptions propagate correctly " &
"from objects of protected types" );
Initial_Data_Block:
begin -- Data causes Constraint_Error.
Data_Buffer.Put (CB20004_0.Data_Item(Report.Ident_Int(51)));
exception
when Constraint_Error =>
Buffer.Handled_In_Body := False; -- Improper exception handling
-- in entry body.
Report.Failed ("Exception propagated to caller " &
" from Initial_Data_Block");
when others =>
Report.Failed ("Exception raised in processing and " &
"propagated to caller from Initial_Data_Block");
end Initial_Data_Block;
Data_Entry_Block:
begin
-- Valid data. No exception.
Data_Buffer.Put (CB20004_0.Data_Item(Report.Ident_Int(3)));
-- Data will cause exception.
Data_Buffer.Put (7); -- Call protected object entry,
-- exception to be handled/
-- reraised in entry body.
Report.Failed ("Data_Over_5 Exception not raised in processing");
exception
when Buffer.Data_Over_5 =>
if Buffer.Propagated_To_Caller then -- Reraised in entry body?
Buffer.Handled_In_Caller := True;
else
Report.Failed ("Exception not reraised in entry body");
end if;
when others =>
Report.Failed ("Exception raised in processing and propagated " &
"to caller from Data_Entry_Block");
end Data_Entry_Block;
Data_Retrieval_Block:
begin
Data_Buffer.Get (Data); -- Retrieval of buffer data, buffer now empty.
-- Exception will be raised in entry body, with
-- propagation to caller.
Report.Failed ("Data_Degradation Exception not raised in processing");
exception
when Buffer.Data_Degradation =>
Handled_In_Caller := True; -- Local Boolean used here.
when others =>
Report.Failed ("Exception raised in processing and propagated " &
"to caller from Data_Retrieval_Block");
end Data_Retrieval_Block;
if not (Buffer.Handled_In_Body and -- Validate proper exception
Buffer.Propagated_To_Caller and -- handling in entry bodies.
Buffer.Handled_In_Caller and
Handled_In_Caller)
then
Report.Failed ("Improper exception handling by entry bodies");
end if;
Report.Result;
end CB20004;
|
