1-- C97115A.ADA
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-- CHECK WHETHER AN ENTRY FAMILY INDEX EXPRESSION FOLLOWING AN OPEN
26-- GUARD IS EVALUATED DIRECTLY AFTER THE GUARD, OR ONLY AFTER ALL GUARDS
27-- HAVE BEEN EVALUATED, OR IN SOME MIXED ORDER SUCH THAT INDEX
28-- EXPRESSIONS ARE EVALUATED AFTER THEIR GUARDS ARE DETERMINED TO BE
29-- OPEN.
30
31-- RM 5/11/82
32-- SPS 11/21/82
33-- JBG 10/24/83
34-- PWN 09/11/94  REMOVED PRAGMA PRIORITY FOR ADA 9X.
35
36with Impdef;
37WITH REPORT; USE REPORT;
38WITH SYSTEM; USE SYSTEM;
39PROCEDURE C97115A IS
40
41
42     -- THE TASK WILL HAVE LAST PRIORITY ( PRIORITY'FIRST )
43
44     EVAL_ORDER  :  STRING (1..6)       := ( 1..6 => '*' );
45     EVAL_ORD    :  STRING (1..6)       := ( 1..6 => '*' );
46     INDEX       :  INTEGER             := 0;
47
48
49     FUNCTION F1 (X:INTEGER) RETURN INTEGER IS
50     BEGIN
51          INDEX := INDEX + 1;
52          EVAL_ORDER (INDEX) := 'F';    -- 123: FGH
53          EVAL_ORD   (INDEX) := 'G';    -- 123: GGG ( 'G' FOR 'GUARD' )
54          RETURN ( IDENT_INT(7) );
55     END F1;
56
57
58     FUNCTION F2 (X:INTEGER) RETURN INTEGER IS
59     BEGIN
60          INDEX := INDEX + 1;
61          EVAL_ORDER (INDEX) := 'G';
62          EVAL_ORD   (INDEX) := 'G';
63          RETURN ( IDENT_INT(7) );
64     END F2;
65
66
67     FUNCTION F3 (X:INTEGER) RETURN INTEGER IS
68     BEGIN
69          INDEX := INDEX + 1;
70          EVAL_ORDER (INDEX) := 'H';
71          EVAL_ORD   (INDEX) := 'G';
72          RETURN ( IDENT_INT(7) );
73     END F3;
74
75
76     FUNCTION  I1 ( X:INTEGER )  RETURN BOOLEAN  IS
77     BEGIN
78          INDEX := INDEX + 1;
79          EVAL_ORDER (INDEX) := 'A';  -- 123: ABC
80          EVAL_ORD   (INDEX) := 'I';  -- 123: III ( 'I' FOR 'INDEX' )
81          RETURN ( IDENT_BOOL(TRUE) );    -- (THAT'S ENTRY-FAMILY INDEX)
82     END I1;
83
84
85     FUNCTION  I2 ( X:INTEGER )  RETURN BOOLEAN  IS
86     BEGIN
87          INDEX := INDEX + 1;
88          EVAL_ORDER (INDEX) := 'B';
89          EVAL_ORD   (INDEX) := 'I';
90          RETURN ( IDENT_BOOL(TRUE) );
91     END I2;
92
93
94     FUNCTION  I3 ( X:INTEGER )  RETURN BOOLEAN  IS
95     BEGIN
96          INDEX := INDEX + 1;
97          EVAL_ORDER (INDEX) := 'C';
98          EVAL_ORD   (INDEX) := 'I';
99          RETURN ( IDENT_BOOL(TRUE) );
100     END I3;
101
102     FUNCTION POS_OF (FUNC : CHARACTER) RETURN INTEGER  IS
103     BEGIN
104          FOR I IN EVAL_ORDER'RANGE LOOP
105               IF EVAL_ORDER(I) = FUNC THEN
106                    RETURN I;
107               END IF;
108          END LOOP;
109          FAILED ("DID NOT FIND LETTER " & FUNC);
110          RETURN 0;
111     END POS_OF;
112
113
114BEGIN
115
116
117     TEST ("C97115A", "CHECK THAT THE INDEX EXPRESSIONS ARE" &
118                      " EVALUATED AFTER THE GUARDS BUT"      &
119                      " BEFORE THE RENDEZVOUS IS ATTEMPTED"  );
120
121
122     DECLARE
123
124
125          TASK T IS
126
127
128               ENTRY E ( BOOLEAN );
129               ENTRY E1;
130
131          END T;
132
133
134          TASK BODY T IS
135          BEGIN
136
137
138               WHILE  E1'COUNT = 0  -- IF  E1  NOT YET CALLED, THEN GIVE
139               LOOP                 --     THE MAIN TASK AN OPPORTUNITY
140                    DELAY  10.01 * Impdef.One_Second;   --     TO ISSUE THE CALL.
141               END LOOP;
142
143
144               SELECT
145
146                         ACCEPT  E1;
147
148               OR
149
150                    WHEN  6 + F1(7) = 13  =>
151                         ACCEPT  E ( I1(17) );
152
153               OR
154
155                    WHEN  6 + F2(7) = 13  =>
156                         ACCEPT  E ( I2(17) );
157
158               OR
159
160                    WHEN  6 + F3(7) = 13  =>
161                         ACCEPT  E ( I3(17) );
162
163               END SELECT;
164
165
166          END T;
167
168
169     BEGIN
170
171          T.E1;
172
173     END; -- END OF BLOCK CONTAINING THE ENTRY CALLS
174
175
176     COMMENT ("GUARD AND INDEX FUNCTIONS WERE CALLED IN ORDER " &
177               EVAL_ORDER);
178     COMMENT ("GUARD AND INDEX EXPRESSIONS WERE EVALUATED IN THE " &
179              "ORDER " & EVAL_ORD);
180
181     IF POS_OF ('F') > POS_OF ('A') OR
182        POS_OF ('G') > POS_OF ('B') OR
183        POS_OF ('H') > POS_OF ('C') THEN
184          FAILED ("AN INDEX EXPRESSION WAS EVALUATED TOO EARLY");
185     END IF;
186
187     RESULT;
188
189END  C97115A;
190