-- C940010.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 if an exception is raised during the execution of an -- entry body it is propagated back to the caller -- -- TEST DESCRIPTION: -- Use a small fragment of code from the simulation of a freeway meter -- used in c940007. Create three individual tasks which will be queued on -- the entry as the barrier is set. Release them one at a time. A -- procedure which is called within the entry has been modified for this -- test to raise a different exception for each pass through. Check that -- all expected exceptions are raised and propagated. -- -- -- CHANGE HISTORY: -- 06 Dec 94 SAIC ACVC 2.0 -- --! with Report; with ImpDef; procedure C940010 is TC_Failed_1 : Boolean := false; begin Report.Test ("C940010", "Check that an exception raised in an entry " & "body is propagated back to the caller"); declare -- encapsulate the test TC_Defined_Error : Exception; -- User defined exception TC_Expected_Passage_Total : constant integer := 669; TC_Int : constant integer := 5; -- Carrier tasks. One is created for each vehicle arriving at each ramp task type Vehicle_31; -- For Ramp_31 type acc_Vehicle_31 is access Vehicle_31; --================================================================ protected Ramp_31 is function Meter_in_Use_State return Boolean; procedure Add_Meter_Queue; procedure Subtract_Meter_Queue; entry Wait_at_Meter; procedure Pulse; -- procedure TC_Passage (Pass_Point : Integer); function TC_Get_Passage_Total return integer; function TC_Get_Current_Exception return integer; private Release_One_Vehicle : Boolean := false; Meter_in_Use : Boolean := true; -- TC: set true for this test -- TC_Multiplier : integer := 1; TC_Passage_Total : integer := 0; -- Use this to cycle through the required exceptions TC_Current_Exception : integer range 0..3 := 0; end Ramp_31; --================================================================ protected body Ramp_31 is -- Trace the paths through the various routines by totaling the -- weighted call parameters procedure TC_Passage (Pass_Point : Integer) is begin TC_Passage_Total := TC_Passage_Total+(Pass_Point*TC_Multiplier); end TC_Passage; -- For the final check of the whole test function TC_Get_Passage_Total return integer is begin return TC_Passage_Total; end TC_Get_Passage_Total; function TC_Get_Current_Exception return integer is begin return TC_Current_Exception; end TC_Get_Current_Exception; ----------------- function Meter_in_Use_State return Boolean is begin return Meter_in_Use; end Meter_in_Use_State; -- Simulate the effects of the regular signal pulse procedure Pulse is begin Release_one_Vehicle := true; end Pulse; -- Keep count of vehicles currently on meter queue - we can't use -- the 'count because we need the outcall trigger procedure Add_Meter_Queue is begin null; --::: stub end Add_Meter_Queue; -- TC: This routine has been modified to raise the required -- exceptions procedure Subtract_Meter_Queue is TC_Pass_Point1 : constant integer := 10; TC_Pass_Point2 : constant integer := 20; TC_Pass_Point3 : constant integer := 30; TC_Pass_Point9 : constant integer := 1000; -- error begin -- Cycle through the required exceptions, one per call TC_Current_Exception := TC_Current_Exception + 1; case TC_Current_Exception is when 1 => TC_Passage (TC_Pass_Point1); -- note passage through here raise Storage_Error; -- PREDEFINED EXCEPTION when 2 => TC_Passage (TC_Pass_Point2); -- note passage through here raise TC_Defined_Error; -- USER DEFINED EXCEPTION when 3 => TC_Passage (TC_Pass_Point3); -- note passage through here -- RUN TIME EXCEPTION (Constraint_Error) -- Add the value 3 to 5 then try to assign it to an object -- whose range is 0..3 - this causes the exception. -- Disguise the values which cause the Constraint_Error -- so that the optimizer will not eliminate this code -- Note: the variable is checked at the end to ensure -- that the actual assignment is attempted. Also note -- the value remains at 3 as the assignment does not -- take place. This is the value that is checked at -- the end of the test. -- Otherwise the optimizer could decide that the result -- of the assignment was not used so why bother to do it? TC_Current_Exception := Report.Ident_Int (TC_Current_Exception) + Report.Ident_Int (TC_Int); when others => -- Set flag for Report.Failed which cannot be called from -- within a Protected Object TC_Failed_1 := True; end case; TC_Passage ( TC_Pass_Point9 ); -- note passage through here end Subtract_Meter_Queue; -- Here each Vehicle task queues itself awaiting release entry Wait_at_Meter when Release_One_Vehicle is -- Example of entry with barriers and persistent signal TC_Pass_Point : constant integer := 2; begin TC_Passage ( TC_Pass_Point ); -- note passage through here Release_One_Vehicle := false; -- Consume the signal -- Decrement number of vehicles on ramp Subtract_Meter_Queue; -- Call procedure from within entry body end Wait_at_Meter; end Ramp_31; --================================================================ -- Carrier task. One is created for each vehicle arriving at Ramp_31 task body Vehicle_31 is TC_Pass_Point_1 : constant integer := 100; TC_Pass_Point_2 : constant integer := 200; TC_Pass_Point_3 : constant integer := 300; begin if Ramp_31.Meter_in_Use_State then -- Increment count of number of vehicles on ramp Ramp_31.Add_Meter_Queue; -- Call a protected procedure -- which is also called from within -- enter the meter queue Ramp_31.Wait_at_Meter; -- Call a protected entry Report.Failed ("Exception not propagated back"); end if; null; --:::: call to the first in the series of the Ramp_Sensors -- this "passes" the vehicle from one sensor to the next exception when Storage_Error => Ramp_31.TC_Passage ( TC_Pass_Point_1 ); -- note passage when TC_Defined_Error => Ramp_31.TC_Passage ( TC_Pass_Point_2 ); -- note passage when Constraint_Error => Ramp_31.TC_Passage ( TC_Pass_Point_3 ); -- note passage when others => Report.Failed ("Unexpected exception in Vehicle Task"); end Vehicle_31; -- Simulate the arrival of a vehicle at the Ramp_Receiver of Ramp_31 -- and the generation of an accompanying carrier task procedure New_Arrival_31 is Next_Vehicle_Task_31: acc_Vehicle_31 := new Vehicle_31; TC_Pass_Point : constant integer := 1; begin Ramp_31.TC_Passage ( TC_Pass_Point ); -- Note passage through here null; --::: stub end New_arrival_31; begin -- declare -- Test driver. This is ALL test control code -- Create three independent tasks which will queue themselves on the -- entry. Each task will get a different exception New_Arrival_31; New_Arrival_31; New_Arrival_31; delay ImpDef.Clear_Ready_Queue; -- Set the barrier condition of the entry true, releasing one task Ramp_31.Pulse; delay ImpDef.Clear_Ready_Queue; Ramp_31.Pulse; delay ImpDef.Clear_Ready_Queue; Ramp_31.Pulse; delay ImpDef.Clear_Ready_Queue; if (TC_Expected_Passage_Total /= Ramp_31.TC_Get_Passage_Total) or -- Note: We are not really interested in this next check. It is -- here to ensure the earlier statements which raised the -- Constraint_Error are not optimized out (Ramp_31.TC_Get_Current_Exception /= 3) then Report.Failed ("Unexpected paths taken"); end if; end; -- declare if TC_Failed_1 then Report.Failed ("Bad path through Subtract_Meter_Queue"); end if; Report.Result; end C940010;