1 /* $NetBSD: msg_241.c,v 1.11 2023/07/09 11:01:27 rillig Exp $ */
2 # 3 "msg_241.c"
3
4 // Test for message: dubious operation '%s' on enum [241]
5 //
6 // As of February 2021, the option -e is not enabled by default in
7 // share/mk/sys.mk, therefore this message is neither well-known nor
8 // well-tested.
9
10 /* lint1-extra-flags: -e -X 351 */
11
12 /*
13 * Enums are a possible implementation of bit-sets.
14 */
15 enum color {
16 RED = 1 << 0,
17 GREEN = 1 << 1,
18 BLUE = 1 << 2
19 };
20
21 extern void sink_bool(_Bool);
22 extern void sink_int(int);
23 extern void sink_color(enum color);
24
25 void
example(void)26 example(void)
27 {
28 enum color c = RED;
29
30 /* expect+1: warning: dubious operation '!' on enum [241] */
31 sink_bool(!c);
32 /* expect+1: warning: dubious operation '~' on enum [241] */
33 sink_color(~c);
34 /* expect+1: warning: dubious operation '++x' on enum [241] */
35 ++c;
36 /* expect+1: warning: dubious operation '--x' on enum [241] */
37 --c;
38 /* expect+1: warning: dubious operation 'x++' on enum [241] */
39 c++;
40 /* expect+1: warning: dubious operation 'x--' on enum [241] */
41 c--;
42 /* expect+1: warning: dubious operation '+' on enum [241] */
43 sink_color(+c);
44 /* expect+1: warning: dubious operation '-' on enum [241] */
45 sink_color(-c);
46 /* expect+1: warning: dubious operation '*' on enum [241] */
47 sink_color(c * c);
48 /* expect+1: warning: dubious operation '/' on enum [241] */
49 sink_color(c / c);
50 /* expect+1: warning: dubious operation '%' on enum [241] */
51 sink_color(c % c);
52 /* expect+1: warning: dubious operation '+' on enum [241] */
53 sink_color(c + c);
54 /* expect+1: warning: dubious operation '-' on enum [241] */
55 sink_color(c - c);
56 /* expect+1: warning: dubious operation '<<' on enum [241] */
57 sink_color(c << c);
58 /* expect+1: warning: dubious operation '>>' on enum [241] */
59 sink_color(c >> c);
60
61 sink_bool(c < c);
62 sink_bool(c <= c);
63 sink_bool(c > c);
64 sink_bool(c >= c);
65 sink_bool(c == c);
66 sink_bool(c != c);
67
68 /* expect+1: warning: dubious operation '&' on enum [241] */
69 sink_color(c & c);
70 /* expect+1: warning: dubious operation '^' on enum [241] */
71 sink_color(c ^ c);
72 /* expect+1: warning: dubious operation '|' on enum [241] */
73 sink_color(c | c);
74
75 /* expect+1: warning: dubious operation '&&' on enum [241] */
76 sink_bool(c && c);
77 /* expect+1: warning: dubious operation '||' on enum [241] */
78 sink_bool(c || c);
79 sink_color(c ? c : BLUE);
80
81 c = GREEN;
82 /* expect+1: warning: dubious operation '*=' on enum [241] */
83 c *= c;
84 /* expect+1: warning: dubious operation '/=' on enum [241] */
85 c /= c;
86 /* expect+1: warning: dubious operation '%=' on enum [241] */
87 c %= c;
88 /* expect+1: warning: dubious operation '+=' on enum [241] */
89 c += c;
90 /* expect+1: warning: dubious operation '-=' on enum [241] */
91 c -= c;
92 /* expect+1: warning: dubious operation '<<=' on enum [241] */
93 c <<= c;
94 /* expect+1: warning: dubious operation '>>=' on enum [241] */
95 c >>= c;
96 /* expect+1: warning: dubious operation '&=' on enum [241] */
97 c &= c;
98 /* expect+1: warning: dubious operation '^=' on enum [241] */
99 c ^= c;
100 /* expect+1: warning: dubious operation '|=' on enum [241] */
101 c |= c;
102
103 /* The cast to unsigned is required by GCC at WARNS=6. */
104 /* expect+1: warning: dubious operation '&=' on enum [241] */
105 c &= ~(unsigned)GREEN;
106 }
107
108 void
cover_typeok_enum(enum color c,int i)109 cover_typeok_enum(enum color c, int i)
110 {
111 /* expect+2: warning: dubious operation '*' on enum [241] */
112 /* expect+1: warning: combination of 'enum color' and 'int', op '>' [242] */
113 if (c * i > 5)
114 return;
115 }
116
117 const char *
color_name(enum color c)118 color_name(enum color c)
119 {
120 static const char *name[] = {
121 [RED] = "red",
122 [GREEN] = "green",
123 [BLUE] = "blue",
124 };
125
126 if (c == RED)
127 return *(c + name); /* unusual but allowed */
128 if (c == GREEN)
129 return c[name]; /* even more unusual */
130 return name[c];
131 }
132