1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
-- C97115A.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 WHETHER AN ENTRY FAMILY INDEX EXPRESSION FOLLOWING AN OPEN
-- GUARD IS EVALUATED DIRECTLY AFTER THE GUARD, OR ONLY AFTER ALL GUARDS
-- HAVE BEEN EVALUATED, OR IN SOME MIXED ORDER SUCH THAT INDEX
-- EXPRESSIONS ARE EVALUATED AFTER THEIR GUARDS ARE DETERMINED TO BE
-- OPEN.
-- RM 5/11/82
-- SPS 11/21/82
-- JBG 10/24/83
-- PWN 09/11/94 REMOVED PRAGMA PRIORITY FOR ADA 9X.
with Impdef;
WITH REPORT; USE REPORT;
WITH SYSTEM; USE SYSTEM;
PROCEDURE C97115A IS
-- THE TASK WILL HAVE LAST PRIORITY ( PRIORITY'FIRST )
EVAL_ORDER : STRING (1..6) := ( 1..6 => '*' );
EVAL_ORD : STRING (1..6) := ( 1..6 => '*' );
INDEX : INTEGER := 0;
FUNCTION F1 (X:INTEGER) RETURN INTEGER IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'F'; -- 123: FGH
EVAL_ORD (INDEX) := 'G'; -- 123: GGG ( 'G' FOR 'GUARD' )
RETURN ( IDENT_INT(7) );
END F1;
FUNCTION F2 (X:INTEGER) RETURN INTEGER IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'G';
EVAL_ORD (INDEX) := 'G';
RETURN ( IDENT_INT(7) );
END F2;
FUNCTION F3 (X:INTEGER) RETURN INTEGER IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'H';
EVAL_ORD (INDEX) := 'G';
RETURN ( IDENT_INT(7) );
END F3;
FUNCTION I1 ( X:INTEGER ) RETURN BOOLEAN IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'A'; -- 123: ABC
EVAL_ORD (INDEX) := 'I'; -- 123: III ( 'I' FOR 'INDEX' )
RETURN ( IDENT_BOOL(TRUE) ); -- (THAT'S ENTRY-FAMILY INDEX)
END I1;
FUNCTION I2 ( X:INTEGER ) RETURN BOOLEAN IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'B';
EVAL_ORD (INDEX) := 'I';
RETURN ( IDENT_BOOL(TRUE) );
END I2;
FUNCTION I3 ( X:INTEGER ) RETURN BOOLEAN IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'C';
EVAL_ORD (INDEX) := 'I';
RETURN ( IDENT_BOOL(TRUE) );
END I3;
FUNCTION POS_OF (FUNC : CHARACTER) RETURN INTEGER IS
BEGIN
FOR I IN EVAL_ORDER'RANGE LOOP
IF EVAL_ORDER(I) = FUNC THEN
RETURN I;
END IF;
END LOOP;
FAILED ("DID NOT FIND LETTER " & FUNC);
RETURN 0;
END POS_OF;
BEGIN
TEST ("C97115A", "CHECK THAT THE INDEX EXPRESSIONS ARE" &
" EVALUATED AFTER THE GUARDS BUT" &
" BEFORE THE RENDEZVOUS IS ATTEMPTED" );
DECLARE
TASK T IS
ENTRY E ( BOOLEAN );
ENTRY E1;
END T;
TASK BODY T IS
BEGIN
WHILE E1'COUNT = 0 -- IF E1 NOT YET CALLED, THEN GIVE
LOOP -- THE MAIN TASK AN OPPORTUNITY
DELAY 10.01 * Impdef.One_Second; -- TO ISSUE THE CALL.
END LOOP;
SELECT
ACCEPT E1;
OR
WHEN 6 + F1(7) = 13 =>
ACCEPT E ( I1(17) );
OR
WHEN 6 + F2(7) = 13 =>
ACCEPT E ( I2(17) );
OR
WHEN 6 + F3(7) = 13 =>
ACCEPT E ( I3(17) );
END SELECT;
END T;
BEGIN
T.E1;
END; -- END OF BLOCK CONTAINING THE ENTRY CALLS
COMMENT ("GUARD AND INDEX FUNCTIONS WERE CALLED IN ORDER " &
EVAL_ORDER);
COMMENT ("GUARD AND INDEX EXPRESSIONS WERE EVALUATED IN THE " &
"ORDER " & EVAL_ORD);
IF POS_OF ('F') > POS_OF ('A') OR
POS_OF ('G') > POS_OF ('B') OR
POS_OF ('H') > POS_OF ('C') THEN
FAILED ("AN INDEX EXPRESSION WAS EVALUATED TOO EARLY");
END IF;
RESULT;
END C97115A;
|
