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jeremybenn |
-- C940010.A
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--
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-- Grant of Unlimited Rights
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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--
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-- DISCLAIMER
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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-- Check that if an exception is raised during the execution of an
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-- entry body it is propagated back to the caller
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--
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-- TEST DESCRIPTION:
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-- Use a small fragment of code from the simulation of a freeway meter
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-- used in c940007. Create three individual tasks which will be queued on
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-- the entry as the barrier is set. Release them one at a time. A
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-- procedure which is called within the entry has been modified for this
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-- test to raise a different exception for each pass through. Check that
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-- all expected exceptions are raised and propagated.
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--
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--
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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--
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--!
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with Report;
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with ImpDef;
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procedure C940010 is
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TC_Failed_1 : Boolean := false;
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begin
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Report.Test ("C940010", "Check that an exception raised in an entry " &
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"body is propagated back to the caller");
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declare -- encapsulate the test
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TC_Defined_Error : Exception; -- User defined exception
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TC_Expected_Passage_Total : constant integer := 669;
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TC_Int : constant integer := 5;
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-- Carrier tasks. One is created for each vehicle arriving at each ramp
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task type Vehicle_31; -- For Ramp_31
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type acc_Vehicle_31 is access Vehicle_31;
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--================================================================
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protected Ramp_31 is
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function Meter_in_Use_State return Boolean;
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procedure Add_Meter_Queue;
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procedure Subtract_Meter_Queue;
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entry Wait_at_Meter;
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procedure Pulse;
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--
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procedure TC_Passage (Pass_Point : Integer);
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function TC_Get_Passage_Total return integer;
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function TC_Get_Current_Exception return integer;
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private
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Release_One_Vehicle : Boolean := false;
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Meter_in_Use : Boolean := true; -- TC: set true for this test
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--
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TC_Multiplier : integer := 1;
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TC_Passage_Total : integer := 0;
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-- Use this to cycle through the required exceptions
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TC_Current_Exception : integer range 0..3 := 0;
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end Ramp_31;
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--================================================================
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protected body Ramp_31 is
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-- Trace the paths through the various routines by totaling the
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-- weighted call parameters
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procedure TC_Passage (Pass_Point : Integer) is
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begin
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TC_Passage_Total := TC_Passage_Total+(Pass_Point*TC_Multiplier);
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end TC_Passage;
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-- For the final check of the whole test
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function TC_Get_Passage_Total return integer is
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begin
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return TC_Passage_Total;
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end TC_Get_Passage_Total;
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function TC_Get_Current_Exception return integer is
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begin
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return TC_Current_Exception;
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end TC_Get_Current_Exception;
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-----------------
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function Meter_in_Use_State return Boolean is
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begin
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return Meter_in_Use;
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end Meter_in_Use_State;
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-- Simulate the effects of the regular signal pulse
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procedure Pulse is
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begin
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Release_one_Vehicle := true;
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end Pulse;
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-- Keep count of vehicles currently on meter queue - we can't use
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-- the 'count because we need the outcall trigger
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procedure Add_Meter_Queue is
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begin
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null; --::: stub
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end Add_Meter_Queue;
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-- TC: This routine has been modified to raise the required
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-- exceptions
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procedure Subtract_Meter_Queue is
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TC_Pass_Point1 : constant integer := 10;
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TC_Pass_Point2 : constant integer := 20;
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TC_Pass_Point3 : constant integer := 30;
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TC_Pass_Point9 : constant integer := 1000; -- error
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begin
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-- Cycle through the required exceptions, one per call
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TC_Current_Exception := TC_Current_Exception + 1;
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case TC_Current_Exception is
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when 1 =>
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TC_Passage (TC_Pass_Point1); -- note passage through here
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raise Storage_Error; -- PREDEFINED EXCEPTION
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when 2 =>
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TC_Passage (TC_Pass_Point2); -- note passage through here
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raise TC_Defined_Error; -- USER DEFINED EXCEPTION
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when 3 =>
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TC_Passage (TC_Pass_Point3); -- note passage through here
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-- RUN TIME EXCEPTION (Constraint_Error)
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-- Add the value 3 to 5 then try to assign it to an object
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-- whose range is 0..3 - this causes the exception.
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-- Disguise the values which cause the Constraint_Error
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-- so that the optimizer will not eliminate this code
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-- Note: the variable is checked at the end to ensure
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-- that the actual assignment is attempted. Also note
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-- the value remains at 3 as the assignment does not
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-- take place. This is the value that is checked at
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-- the end of the test.
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-- Otherwise the optimizer could decide that the result
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-- of the assignment was not used so why bother to do it?
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TC_Current_Exception :=
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Report.Ident_Int (TC_Current_Exception) +
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Report.Ident_Int (TC_Int);
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when others =>
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-- Set flag for Report.Failed which cannot be called from
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-- within a Protected Object
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TC_Failed_1 := True;
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end case;
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TC_Passage ( TC_Pass_Point9 ); -- note passage through here
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end Subtract_Meter_Queue;
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-- Here each Vehicle task queues itself awaiting release
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entry Wait_at_Meter when Release_One_Vehicle is
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-- Example of entry with barriers and persistent signal
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TC_Pass_Point : constant integer := 2;
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begin
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TC_Passage ( TC_Pass_Point ); -- note passage through here
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Release_One_Vehicle := false; -- Consume the signal
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-- Decrement number of vehicles on ramp
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Subtract_Meter_Queue; -- Call procedure from within entry body
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end Wait_at_Meter;
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end Ramp_31;
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--================================================================
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-- Carrier task. One is created for each vehicle arriving at Ramp_31
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task body Vehicle_31 is
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TC_Pass_Point_1 : constant integer := 100;
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TC_Pass_Point_2 : constant integer := 200;
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TC_Pass_Point_3 : constant integer := 300;
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begin
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if Ramp_31.Meter_in_Use_State then
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-- Increment count of number of vehicles on ramp
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Ramp_31.Add_Meter_Queue; -- Call a protected procedure
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-- which is also called from within
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-- enter the meter queue
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Ramp_31.Wait_at_Meter; -- Call a protected entry
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Report.Failed ("Exception not propagated back");
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end if;
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null; --:::: call to the first in the series of the Ramp_Sensors
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-- this "passes" the vehicle from one sensor to the next
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exception
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when Storage_Error =>
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Ramp_31.TC_Passage ( TC_Pass_Point_1 ); -- note passage
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when TC_Defined_Error =>
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Ramp_31.TC_Passage ( TC_Pass_Point_2 ); -- note passage
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when Constraint_Error =>
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Ramp_31.TC_Passage ( TC_Pass_Point_3 ); -- note passage
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when others =>
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Report.Failed ("Unexpected exception in Vehicle Task");
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end Vehicle_31;
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-- Simulate the arrival of a vehicle at the Ramp_Receiver of Ramp_31
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-- and the generation of an accompanying carrier task
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procedure New_Arrival_31 is
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Next_Vehicle_Task_31: acc_Vehicle_31 := new Vehicle_31;
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TC_Pass_Point : constant integer := 1;
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begin
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Ramp_31.TC_Passage ( TC_Pass_Point ); -- Note passage through here
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null; --::: stub
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end New_arrival_31;
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begin -- declare
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-- Test driver. This is ALL test control code
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-- Create three independent tasks which will queue themselves on the
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-- entry. Each task will get a different exception
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New_Arrival_31;
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New_Arrival_31;
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New_Arrival_31;
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delay ImpDef.Clear_Ready_Queue;
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-- Set the barrier condition of the entry true, releasing one task
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Ramp_31.Pulse;
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delay ImpDef.Clear_Ready_Queue;
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Ramp_31.Pulse;
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delay ImpDef.Clear_Ready_Queue;
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Ramp_31.Pulse;
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delay ImpDef.Clear_Ready_Queue;
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if (TC_Expected_Passage_Total /= Ramp_31.TC_Get_Passage_Total) or
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-- Note: We are not really interested in this next check. It is
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-- here to ensure the earlier statements which raised the
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-- Constraint_Error are not optimized out
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(Ramp_31.TC_Get_Current_Exception /= 3) then
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Report.Failed ("Unexpected paths taken");
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end if;
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end; -- declare
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if TC_Failed_1 then
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Report.Failed ("Bad path through Subtract_Meter_Queue");
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end if;
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Report.Result;
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end C940010;
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