1 /* Test for diagnostics for implicit conversions between integer types
2 These tests come from gcc/testsuite/gcc.dg/overflow-warn-2.c */
3
4 /* { dg-do compile } */
5 /* { dg-options "-std=c99 -fsigned-char -Wconversion -Wno-sign-conversion" } */
6
7 #include <limits.h>
8
9 void fsc (signed char sc);
10 void fuc (unsigned char uc);
11 unsigned fui (unsigned int ui);
12 void fsi (signed int ui);
13
h(int x)14 void h (int x)
15 {
16 unsigned int ui = 3;
17 int si = 3;
18 unsigned char uc = 3;
19 signed char sc = 3;
20
21 uc = ui; /* { dg-warning "conversion" } */
22 uc = si; /* { dg-warning "conversion" } */
23 sc = ui; /* { dg-warning "conversion" } */
24 sc = si; /* { dg-warning "conversion" } */
25 fuc (ui); /* { dg-warning "conversion" } */
26 fuc (si); /* { dg-warning "conversion" } */
27 fsc (ui); /* { dg-warning "conversion" } */
28 fsc (si); /* { dg-warning "conversion" } */
29
30 fsi (si);
31 fui (ui);
32 fsi (uc);
33 si = uc;
34 fui (uc);
35 ui = uc;
36 fui ('A');
37 ui = 'A';
38 fsi ('A');
39 si = 'A';
40 fuc ('A');
41 uc = 'A';
42
43 uc = x ? 1U : -1; /* { dg-warning "conversion" } */
44 uc = x ? SCHAR_MIN : 1U; /* { dg-warning "conversion" } */
45 uc = x ? 1 : -1; /* Warned by -Wsign-conversion. */
46 uc = x ? SCHAR_MIN : 1; /* Warned by -Wsign-conversion. */
47 ui = x ? 1U : -1; /* Warned by -Wsign-conversion. */
48 ui = x ? INT_MIN : 1U; /* Warned by -Wsign-conversion. */
49 ui = ui ? SCHAR_MIN : 1U; /* Warned by -Wsign-conversion. */
50 ui = 1U * -1; /* Warned by -Wsign-conversion. */
51 ui = ui + INT_MIN; /* Warned by -Wsign-conversion. */
52 ui = x ? 1 : -1; /* Warned by -Wsign-conversion. */
53 ui = ui ? SCHAR_MIN : 1; /* Warned by -Wsign-conversion. */
54
55 fuc (-1); /* Warned by -Wsign-conversion. */
56 uc = -1; /* Warned by -Wsign-conversion. */
57 fui (-1); /* Warned by -Wsign-conversion. */
58 ui = -1; /* Warned by -Wsign-conversion. */
59 fuc ('\xa0'); /* Warned by -Wsign-conversion. */
60 uc = '\xa0'; /* Warned by -Wsign-conversion. */
61 fui ('\xa0'); /* Warned by -Wsign-conversion. */
62 ui = '\xa0'; /* Warned by -Wsign-conversion. */
63 fsi ((unsigned) INT_MAX + 1U); /* Warned by -Wsign-conversion. */
64 si = (unsigned) INT_MAX + 1U; /* Warned by -Wsign-conversion. */
65
66
67 fsi (UINT_MAX - 1); /* Warned by -Wsign-conversion. */
68 si = UINT_MAX - 1; /* Warned by -Wsign-conversion. */
69 fsi (UINT_MAX - 1U); /* Warned by -Wsign-conversion. */
70 si = UINT_MAX - 1U; /* Warned by -Wsign-conversion. */
71 fsi (UINT_MAX/3U);
72 si = UINT_MAX/3U;
73 fsi (UINT_MAX/3);
74 si = UINT_MAX/3;
75 fui (UINT_MAX - 1);
76 ui = UINT_MAX - 1;
77
78 uc = (unsigned char) -1;
79 ui = -1 * (1 * -1);
80 ui = (unsigned) -1;
81
82 fsc (uc); /* Warned by -Wsign-conversion. */
83 sc = uc; /* Warned by -Wsign-conversion. */
84 fuc (sc); /* Warned by -Wsign-conversion. */
85 uc = sc; /* Warned by -Wsign-conversion. */
86 fsi (ui); /* Warned by -Wsign-conversion. */
87 si = ui; /* Warned by -Wsign-conversion. */
88 fui (si); /* Warned by -Wsign-conversion. */
89 ui = si; /* Warned by -Wsign-conversion. */
90 fui (sc); /* Warned by -Wsign-conversion. */
91 ui = sc; /* Warned by -Wsign-conversion. */
92 }
93
fui(unsigned a)94 unsigned fui (unsigned a) { return a + -1; } /* Warned by -Wsign-conversion. */
95
96
97