| -- C52011B.ADA |
| |
| -- 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. |
| --* |
| -- CHECK DISCRIMINANT CONSTRAINTS FOR ASSIGNMENT OF ACCESS SUBTYPES. |
| -- SPECIFICALLY, CHECK THAT: |
| |
| -- A) ANY ACCESS TYPE VARIABLE AND CONSTRAINED SUBTYPE VARIABLES OF THAT |
| -- TYPE MAY BE ASSIGNED TO ONE ANOTHER IF THE VALUE BEING ASSIGNED |
| -- IS NULL. |
| |
| -- B) VARIABLES OF THE SAME CONSTRAINED ACCESS SUBTYPE MAY BE ASSIGNED |
| -- TO ONE ANOTHER OR TO VARIABLES OF THE BASE ACCESS TYPE. |
| |
| -- C) CONSTRAINT_ERROR IS RAISED UPON ASSIGNMENT OF NON-NULL OBJECTS |
| -- BETWEEN DIFFERENTLY CONSTRAINED ACCESS SUBTYPES. |
| |
| -- D) CONSTRAINT_ERROR IS RAISED UPON ASSIGNMENT OF A NON-NULL OBJECT |
| -- OF A BASE ACCESS TYPE VARIABLE TO A VARIABLE OF ONE OF ITS |
| -- CONSTRAINED SUBTYPES IF THE CONSTRAINTS ON THE OBJECT DIFFER |
| -- FROM THOSE ON THE SUBTYPE. |
| |
| -- E) NULL CAN BE ASSIGNED TO BASE ACCESS TYPES AND ANY CONSTRAINED |
| -- SUBTYPES OF THIS TYPE. |
| |
| -- ASL 7/06/81 |
| -- RM 6/17/82 |
| -- RLB 6/29/01 - FIXED TO ALLOW AGGRESIVE OPTIMIZATION. |
| |
| WITH REPORT; |
| PROCEDURE C52011B IS |
| |
| USE REPORT; |
| |
| TYPE REC(DISC : INTEGER := -1 ) IS |
| RECORD |
| NULL; |
| END RECORD; |
| |
| TYPE REC_NAME IS ACCESS REC; |
| SUBTYPE S1 IS REC_NAME(IDENT_INT(5)); |
| SUBTYPE S2 IS REC_NAME(IDENT_INT(3)); |
| |
| W : REC_NAME := NULL; -- E. |
| X1,X2 : S1 := NULL; -- E. |
| Y1,Y2 : S2 := NULL; -- E. |
| |
| W_NONNULL : REC_NAME := NEW REC(7) ; |
| X1_NONNULL : S1 := NEW REC(IDENT_INT(5)); |
| Y1_NONNULL : S2 := NEW REC(IDENT_INT(3)); |
| |
| TOO_EARLY : BOOLEAN := TRUE; |
| |
| BEGIN |
| |
| TEST ("C52011B", "DISCRIMINANT CONSTRAINTS ON ACCESS SUBTYPE " & |
| "OBJECTS MUST BE SATISFIED FOR ASSIGNMENT"); |
| |
| BEGIN |
| |
| IF EQUAL(3,3) THEN |
| W_NONNULL := X1; -- A. |
| END IF; |
| IF W_NONNULL /= X1 THEN |
| FAILED ("ASSIGNMENT FAILED - 1"); |
| END IF; |
| |
| IF EQUAL(3,3) THEN |
| W := Y1; -- A. |
| END IF; |
| IF W /= Y1 THEN |
| FAILED ("ASSIGNMENT FAILED - 2"); |
| END IF; |
| |
| IF EQUAL(3,3) THEN |
| X1_NONNULL := Y1; -- A. |
| END IF; |
| IF X1_NONNULL /= Y1 THEN |
| FAILED ("ASSIGNMENT FAILED - 3"); |
| END IF; |
| |
| IF EQUAL(3,3) THEN |
| Y1_NONNULL := Y2; -- A. |
| END IF; |
| IF Y1_NONNULL /= Y2 THEN |
| FAILED ("ASSIGNMENT FAILED - 4"); |
| END IF; |
| |
| X1 := NEW REC(IDENT_INT(5)); |
| IF EQUAL(3,3) THEN |
| X2 := X1; -- B. |
| END IF; |
| IF X1 /= X2 THEN |
| FAILED ("ASSIGNMENT FAILED - 5"); |
| END IF; |
| |
| IF EQUAL(3,3) THEN |
| W := X1; -- B. |
| END IF; |
| IF W /= X1 THEN |
| FAILED ("ASSIGNMENT FAILED - 6"); |
| END IF; |
| |
| BEGIN |
| Y1 := X1; -- C. |
| IF Y1.DISC /= REPORT.IDENT_INT(3) THEN |
| FAILED ("NON-NULL ASSIGNMENT MADE BETWEEN TWO " & |
| "VARIABLES OF DIFFERENT CONSTRAINED ACCESS SUBTYPES " & |
| "AND CONSTRAINT IS CHANGED"); |
| ELSE |
| FAILED ("NON-NULL ASSIGNMENT MADE BETWEEN TWO " & |
| "VARIABLES OF DIFFERENT CONSTRAINED ACCESS SUBTYPES " & |
| "AND CONSTRAINT IS NOT CHANGED"); |
| END IF; |
| EXCEPTION |
| |
| WHEN CONSTRAINT_ERROR => NULL; |
| |
| WHEN OTHERS => |
| FAILED ("WRONG EXCEPTION - 1"); |
| |
| END; |
| |
| W := NEW REC(IDENT_INT(3)); |
| |
| BEGIN |
| X1 := W; -- D. |
| IF X1.DISC /= REPORT.IDENT_INT(5) THEN |
| FAILED ("NON-NULL ASSIGNMENT MADE FROM UNCONSTRAINED " & |
| "ACCESS TYPE DESIGNATING CONSTRAINED OBJECT TO "& |
| "ACCESS SUBTYPE WITH DIFFERENT CONSTRAINT " & |
| "AND CONSTRAINT IS CHANGED"); |
| ELSE |
| FAILED ("NON-NULL ASSIGNMENT MADE FROM UNCONSTRAINED " & |
| "ACCESS TYPE DESIGNATING CONSTRAINED OBJECT TO "& |
| "ACCESS SUBTYPE WITH DIFFERENT CONSTRAINT " & |
| "AND CONSTRAINT IS NOT CHANGED"); |
| END IF; |
| EXCEPTION |
| |
| WHEN CONSTRAINT_ERROR => |
| NULL ; |
| |
| WHEN OTHERS => |
| FAILED ("WRONG EXCEPTION - 2"); |
| |
| END; |
| |
| EXCEPTION |
| |
| WHEN OTHERS => |
| FAILED ("EXCEPTION RAISED"); |
| |
| END; |
| |
| |
| RESULT; |
| |
| |
| END C52011B; |