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1 12 jlechner
-- C97115A.ADA
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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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-- CHECK WHETHER AN ENTRY FAMILY INDEX EXPRESSION FOLLOWING AN OPEN
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-- GUARD IS EVALUATED DIRECTLY AFTER THE GUARD, OR ONLY AFTER ALL GUARDS
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-- HAVE BEEN EVALUATED, OR IN SOME MIXED ORDER SUCH THAT INDEX
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-- EXPRESSIONS ARE EVALUATED AFTER THEIR GUARDS ARE DETERMINED TO BE
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-- OPEN. 
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-- RM 5/11/82
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-- SPS 11/21/82
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-- JBG 10/24/83
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-- PWN 09/11/94  REMOVED PRAGMA PRIORITY FOR ADA 9X.
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with Impdef;
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WITH REPORT; USE REPORT;
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WITH SYSTEM; USE SYSTEM;
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PROCEDURE C97115A IS
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     -- THE TASK WILL HAVE LAST PRIORITY ( PRIORITY'FIRST )
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     EVAL_ORDER  :  STRING (1..6)       := ( 1..6 => '*' );
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     EVAL_ORD    :  STRING (1..6)       := ( 1..6 => '*' );
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     INDEX       :  INTEGER             := 0;
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     FUNCTION F1 (X:INTEGER) RETURN INTEGER IS
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     BEGIN
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          INDEX := INDEX + 1;
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          EVAL_ORDER (INDEX) := 'F';    -- 123: FGH
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          EVAL_ORD   (INDEX) := 'G';    -- 123: GGG ( 'G' FOR 'GUARD' )
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          RETURN ( IDENT_INT(7) );
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     END F1;
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     FUNCTION F2 (X:INTEGER) RETURN INTEGER IS
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     BEGIN
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          INDEX := INDEX + 1;
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          EVAL_ORDER (INDEX) := 'G';
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          EVAL_ORD   (INDEX) := 'G';
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          RETURN ( IDENT_INT(7) );
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     END F2;
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     FUNCTION F3 (X:INTEGER) RETURN INTEGER IS
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     BEGIN
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          INDEX := INDEX + 1;
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          EVAL_ORDER (INDEX) := 'H';
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          EVAL_ORD   (INDEX) := 'G';
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          RETURN ( IDENT_INT(7) );
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     END F3;
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     FUNCTION  I1 ( X:INTEGER )  RETURN BOOLEAN  IS
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     BEGIN
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          INDEX := INDEX + 1;
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          EVAL_ORDER (INDEX) := 'A';  -- 123: ABC
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          EVAL_ORD   (INDEX) := 'I';  -- 123: III ( 'I' FOR 'INDEX' )
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          RETURN ( IDENT_BOOL(TRUE) );    -- (THAT'S ENTRY-FAMILY INDEX)
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     END I1;
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     FUNCTION  I2 ( X:INTEGER )  RETURN BOOLEAN  IS
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     BEGIN
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          INDEX := INDEX + 1;
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          EVAL_ORDER (INDEX) := 'B';
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          EVAL_ORD   (INDEX) := 'I';
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          RETURN ( IDENT_BOOL(TRUE) );
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     END I2;
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     FUNCTION  I3 ( X:INTEGER )  RETURN BOOLEAN  IS
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     BEGIN
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          INDEX := INDEX + 1;
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          EVAL_ORDER (INDEX) := 'C';
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          EVAL_ORD   (INDEX) := 'I';
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          RETURN ( IDENT_BOOL(TRUE) );
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     END I3;
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     FUNCTION POS_OF (FUNC : CHARACTER) RETURN INTEGER  IS
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     BEGIN
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          FOR I IN EVAL_ORDER'RANGE LOOP
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               IF EVAL_ORDER(I) = FUNC THEN
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                    RETURN I;
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               END IF;
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          END LOOP;
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          FAILED ("DID NOT FIND LETTER " & FUNC);
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          RETURN 0;
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     END POS_OF;
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BEGIN
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     TEST ("C97115A", "CHECK THAT THE INDEX EXPRESSIONS ARE" &
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                      " EVALUATED AFTER THE GUARDS BUT"      &
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                      " BEFORE THE RENDEZVOUS IS ATTEMPTED"  );
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     DECLARE
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          TASK T IS
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               ENTRY E ( BOOLEAN );
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               ENTRY E1;
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          END T;
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          TASK BODY T IS
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          BEGIN
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               WHILE  E1'COUNT = 0  -- IF  E1  NOT YET CALLED, THEN GIVE
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               LOOP                 --     THE MAIN TASK AN OPPORTUNITY
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                    DELAY  10.01 * Impdef.One_Second;   --     TO ISSUE THE CALL.
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               END LOOP;
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               SELECT
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                         ACCEPT  E1;
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               OR
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                    WHEN  6 + F1(7) = 13  =>
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                         ACCEPT  E ( I1(17) );
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               OR
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                    WHEN  6 + F2(7) = 13  =>
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                         ACCEPT  E ( I2(17) );
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               OR
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                    WHEN  6 + F3(7) = 13  =>
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                         ACCEPT  E ( I3(17) );
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               END SELECT;
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          END T;
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     BEGIN
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          T.E1;
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     END; -- END OF BLOCK CONTAINING THE ENTRY CALLS
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     COMMENT ("GUARD AND INDEX FUNCTIONS WERE CALLED IN ORDER " &
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               EVAL_ORDER);
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     COMMENT ("GUARD AND INDEX EXPRESSIONS WERE EVALUATED IN THE " &
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              "ORDER " & EVAL_ORD);
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     IF POS_OF ('F') > POS_OF ('A') OR
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        POS_OF ('G') > POS_OF ('B') OR
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        POS_OF ('H') > POS_OF ('C') THEN
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          FAILED ("AN INDEX EXPRESSION WAS EVALUATED TOO EARLY");
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     END IF;
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     RESULT;
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END  C97115A;

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