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-- CD4031A.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.

--*

-- OBJECTIVE:

--     CHECK THAT WHEN A RECORD REPRESENTATION CLAUSE IS GIVEN FOR A

--     VARIANT RECORD TYPE, THEN COMPONENTS BELONGING TO DIFFERENT

--     VARIANTS CAN BE GIVEN OVERLAPPING STORAGE.

-- HISTORY:

--     PWB 07/22/87  CREATED ORIGINAL TEST.

--     DHH 03/27/89  CHANGED EXTENSION FROM '.DEP' TO '.ADA' AND

--                   ADDED CHECK FOR REPRESENTATION CLAUSE.

--     RJW 06/12/90  REMOVED REFERENCES TO LENGTH_CHECK.  REVISED

--                   COMMENTS.

--     JRL 10/13/96  Adjusted ranges in type definitions to allow 1's

--                   complement machines to represent all values in

--                   the specified number of bits.

WITH REPORT; USE REPORT;

PROCEDURE CD4031A IS

     TYPE DISCRIMINAN IS RANGE -1 .. 1;

     TYPE INT IS RANGE -3 .. 3;

     TYPE LARGE_INT IS RANGE -7 .. 7;

     TYPE TEST_CLAUSE (DISC : DISCRIMINAN := 0) IS

          RECORD

               CASE DISC IS

                    WHEN 0 =>

                         INTEGER_COMP : LARGE_INT;

                    WHEN OTHERS  =>

                         CH_COMP_1 : INT;

                         CH_COMP_2 : INT;

               END CASE;

          END RECORD;

     FOR TEST_CLAUSE USE

          RECORD

               DISC AT 0

                           RANGE 0 .. 1;

               INTEGER_COMP AT 0

                           RANGE 2 .. 5;

               CH_COMP_1 AT 0

                           RANGE 2 .. 4;

               CH_COMP_2 AT 0

                           RANGE 5 .. 7;

          END RECORD;

     TYPE TEST_CL1 IS NEW TEST_CLAUSE(DISC => 0);

     TYPE TEST_CL2 IS NEW TEST_CLAUSE(DISC => 1);

     TEST_RECORD : TEST_CL1;

     TEST_RECORD1 : TEST_CL2;

     INTEGER_COMP_FIRST,

     CH_COMP_1_FIRST : INTEGER;

BEGIN

     TEST ("CD4031A", "IN RECORD REPRESENTATION CLAUSES " &

                      "FOR VARIANT RECORD TYPES, " &

                      "COMPONENTS OF DIFFERENT VARIANTS " &

                      "CAN BE GIVEN OVERLAPPING STORAGE");

     TEST_RECORD := (0, -7);

     INTEGER_COMP_FIRST := TEST_RECORD.INTEGER_COMP'FIRST_BIT;

     TEST_RECORD1 := (1, -3, -3);

     CH_COMP_1_FIRST := TEST_RECORD1.CH_COMP_1'FIRST_BIT;

     IF INTEGER_COMP_FIRST /= CH_COMP_1_FIRST THEN

          FAILED ("COMPONENTS DO NOT BEGIN AT SAME POINT");

     END IF;

     RESULT;

END CD4031A;