1-- C940010.A 2-- 3-- Grant of Unlimited Rights 4-- 5-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687, 6-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 7-- unlimited rights in the software and documentation contained herein. 8-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making 9-- this public release, the Government intends to confer upon all 10-- recipients unlimited rights equal to those held by the Government. 11-- These rights include rights to use, duplicate, release or disclose the 12-- released technical data and computer software in whole or in part, in 13-- any manner and for any purpose whatsoever, and to have or permit others 14-- to do so. 15-- 16-- DISCLAIMER 17-- 18-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR 19-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 20-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE 21-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 22-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A 23-- PARTICULAR PURPOSE OF SAID MATERIAL. 24--* 25-- 26-- OBJECTIVE: 27-- Check that if an exception is raised during the execution of an 28-- entry body it is propagated back to the caller 29-- 30-- TEST DESCRIPTION: 31-- Use a small fragment of code from the simulation of a freeway meter 32-- used in c940007. Create three individual tasks which will be queued on 33-- the entry as the barrier is set. Release them one at a time. A 34-- procedure which is called within the entry has been modified for this 35-- test to raise a different exception for each pass through. Check that 36-- all expected exceptions are raised and propagated. 37-- 38-- 39-- CHANGE HISTORY: 40-- 06 Dec 94 SAIC ACVC 2.0 41-- 42--! 43 44 45with Report; 46with ImpDef; 47 48procedure C940010 is 49 50 TC_Failed_1 : Boolean := false; 51 52begin 53 54 Report.Test ("C940010", "Check that an exception raised in an entry " & 55 "body is propagated back to the caller"); 56 57 declare -- encapsulate the test 58 59 TC_Defined_Error : Exception; -- User defined exception 60 TC_Expected_Passage_Total : constant integer := 669; 61 TC_Int : constant integer := 5; 62 63 -- Carrier tasks. One is created for each vehicle arriving at each ramp 64 task type Vehicle_31; -- For Ramp_31 65 type acc_Vehicle_31 is access Vehicle_31; 66 67 68 --================================================================ 69 protected Ramp_31 is 70 71 function Meter_in_Use_State return Boolean; 72 procedure Add_Meter_Queue; 73 procedure Subtract_Meter_Queue; 74 entry Wait_at_Meter; 75 procedure Pulse; 76 -- 77 procedure TC_Passage (Pass_Point : Integer); 78 function TC_Get_Passage_Total return integer; 79 function TC_Get_Current_Exception return integer; 80 81 private 82 83 Release_One_Vehicle : Boolean := false; 84 Meter_in_Use : Boolean := true; -- TC: set true for this test 85 -- 86 TC_Multiplier : integer := 1; 87 TC_Passage_Total : integer := 0; 88 -- Use this to cycle through the required exceptions 89 TC_Current_Exception : integer range 0..3 := 0; 90 91 end Ramp_31; 92 --================================================================ 93 protected body Ramp_31 is 94 95 96 -- Trace the paths through the various routines by totaling the 97 -- weighted call parameters 98 procedure TC_Passage (Pass_Point : Integer) is 99 begin 100 TC_Passage_Total := TC_Passage_Total+(Pass_Point*TC_Multiplier); 101 end TC_Passage; 102 103 -- For the final check of the whole test 104 function TC_Get_Passage_Total return integer is 105 begin 106 return TC_Passage_Total; 107 end TC_Get_Passage_Total; 108 109 function TC_Get_Current_Exception return integer is 110 begin 111 return TC_Current_Exception; 112 end TC_Get_Current_Exception; 113 114 115 ----------------- 116 117 function Meter_in_Use_State return Boolean is 118 begin 119 return Meter_in_Use; 120 end Meter_in_Use_State; 121 122 -- Simulate the effects of the regular signal pulse 123 procedure Pulse is 124 begin 125 Release_one_Vehicle := true; 126 end Pulse; 127 128 -- Keep count of vehicles currently on meter queue - we can't use 129 -- the 'count because we need the outcall trigger 130 procedure Add_Meter_Queue is 131 begin 132 null; --::: stub 133 end Add_Meter_Queue; 134 135 -- TC: This routine has been modified to raise the required 136 -- exceptions 137 procedure Subtract_Meter_Queue is 138 TC_Pass_Point1 : constant integer := 10; 139 TC_Pass_Point2 : constant integer := 20; 140 TC_Pass_Point3 : constant integer := 30; 141 TC_Pass_Point9 : constant integer := 1000; -- error 142 begin 143 -- Cycle through the required exceptions, one per call 144 TC_Current_Exception := TC_Current_Exception + 1; 145 case TC_Current_Exception is 146 when 1 => 147 TC_Passage (TC_Pass_Point1); -- note passage through here 148 raise Storage_Error; -- PREDEFINED EXCEPTION 149 when 2 => 150 TC_Passage (TC_Pass_Point2); -- note passage through here 151 raise TC_Defined_Error; -- USER DEFINED EXCEPTION 152 when 3 => 153 TC_Passage (TC_Pass_Point3); -- note passage through here 154 -- RUN TIME EXCEPTION (Constraint_Error) 155 -- Add the value 3 to 5 then try to assign it to an object 156 -- whose range is 0..3 - this causes the exception. 157 -- Disguise the values which cause the Constraint_Error 158 -- so that the optimizer will not eliminate this code 159 -- Note: the variable is checked at the end to ensure 160 -- that the actual assignment is attempted. Also note 161 -- the value remains at 3 as the assignment does not 162 -- take place. This is the value that is checked at 163 -- the end of the test. 164 -- Otherwise the optimizer could decide that the result 165 -- of the assignment was not used so why bother to do it? 166 TC_Current_Exception := 167 Report.Ident_Int (TC_Current_Exception) + 168 Report.Ident_Int (TC_Int); 169 when others => 170 -- Set flag for Report.Failed which cannot be called from 171 -- within a Protected Object 172 TC_Failed_1 := True; 173 end case; 174 175 TC_Passage ( TC_Pass_Point9 ); -- note passage through here 176 end Subtract_Meter_Queue; 177 178 -- Here each Vehicle task queues itself awaiting release 179 entry Wait_at_Meter when Release_One_Vehicle is 180 -- Example of entry with barriers and persistent signal 181 TC_Pass_Point : constant integer := 2; 182 begin 183 TC_Passage ( TC_Pass_Point ); -- note passage through here 184 Release_One_Vehicle := false; -- Consume the signal 185 -- Decrement number of vehicles on ramp 186 Subtract_Meter_Queue; -- Call procedure from within entry body 187 end Wait_at_Meter; 188 189 end Ramp_31; 190 --================================================================ 191 192 -- Carrier task. One is created for each vehicle arriving at Ramp_31 193 task body Vehicle_31 is 194 TC_Pass_Point_1 : constant integer := 100; 195 TC_Pass_Point_2 : constant integer := 200; 196 TC_Pass_Point_3 : constant integer := 300; 197 begin 198 if Ramp_31.Meter_in_Use_State then 199 -- Increment count of number of vehicles on ramp 200 Ramp_31.Add_Meter_Queue; -- Call a protected procedure 201 -- which is also called from within 202 -- enter the meter queue 203 Ramp_31.Wait_at_Meter; -- Call a protected entry 204 Report.Failed ("Exception not propagated back"); 205 end if; 206 null; --:::: call to the first in the series of the Ramp_Sensors 207 -- this "passes" the vehicle from one sensor to the next 208 exception 209 when Storage_Error => 210 Ramp_31.TC_Passage ( TC_Pass_Point_1 ); -- note passage 211 when TC_Defined_Error => 212 Ramp_31.TC_Passage ( TC_Pass_Point_2 ); -- note passage 213 when Constraint_Error => 214 Ramp_31.TC_Passage ( TC_Pass_Point_3 ); -- note passage 215 when others => 216 Report.Failed ("Unexpected exception in Vehicle Task"); 217 end Vehicle_31; 218 219 -- Simulate the arrival of a vehicle at the Ramp_Receiver of Ramp_31 220 -- and the generation of an accompanying carrier task 221 procedure New_Arrival_31 is 222 Next_Vehicle_Task_31: acc_Vehicle_31 := new Vehicle_31; 223 TC_Pass_Point : constant integer := 1; 224 begin 225 Ramp_31.TC_Passage ( TC_Pass_Point ); -- Note passage through here 226 null; --::: stub 227 end New_arrival_31; 228 229 230 231 begin -- declare 232 233 -- Test driver. This is ALL test control code 234 235 -- Create three independent tasks which will queue themselves on the 236 -- entry. Each task will get a different exception 237 New_Arrival_31; 238 New_Arrival_31; 239 New_Arrival_31; 240 241 delay ImpDef.Clear_Ready_Queue; 242 243 -- Set the barrier condition of the entry true, releasing one task 244 Ramp_31.Pulse; 245 delay ImpDef.Clear_Ready_Queue; 246 247 Ramp_31.Pulse; 248 delay ImpDef.Clear_Ready_Queue; 249 250 Ramp_31.Pulse; 251 delay ImpDef.Clear_Ready_Queue; 252 253 if (TC_Expected_Passage_Total /= Ramp_31.TC_Get_Passage_Total) or 254 -- Note: We are not really interested in this next check. It is 255 -- here to ensure the earlier statements which raised the 256 -- Constraint_Error are not optimized out 257 (Ramp_31.TC_Get_Current_Exception /= 3) then 258 Report.Failed ("Unexpected paths taken"); 259 end if; 260 261 end; -- declare 262 263 if TC_Failed_1 then 264 Report.Failed ("Bad path through Subtract_Meter_Queue"); 265 end if; 266 267 Report.Result; 268 269end C940010; 270