-- 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;