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" } */
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 from .unsigned int. to .unsigned char." } */
44 /* { dg-warning "unsigned conversion" "implicit" { target *-*-* } .-1 } */
45 uc = x ? SCHAR_MIN : 1U; /* { dg-warning "unsigned conversion" } */
46 /* { dg-warning "conversion from .unsigned int. to .unsigned char." "implicit" { target *-*-* } .-1 } */
47 uc = x ? 1 : -1; /* { dg-warning "signed conversion" } */
48 uc = x ? SCHAR_MIN : 1; /* { dg-warning "signed conversion" } */
49 ui = x ? 1U : -1; /* { dg-warning "signed conversion" } */
50 ui = x ? INT_MIN : 1U; /* { dg-warning "signed conversion" } */
51 ui = ui ? SCHAR_MIN : 1U; /* { dg-warning "signed conversion" } */
52 ui = 1U * -1; /* { dg-warning "signed conversion" } */
53 ui = ui + INT_MIN; /* { dg-warning "signed conversion" } */
54 ui = x ? 1 : -1; /* { dg-warning "signed conversion" } */
55 ui = ui ? SCHAR_MIN : 1; /* { dg-warning "signed conversion" } */
56
57 fuc (-1); /* { dg-warning "signed conversion" } */
58 uc = -1; /* { dg-warning "signed conversion" } */
59 fui (-1); /* { dg-warning "signed conversion" } */
60 ui = -1; /* { dg-warning "signed conversion" } */
61 fuc ('\xa0'); /* { dg-warning "signed conversion" } */
62 uc = '\xa0'; /* { dg-warning "signed conversion" } */
63 fui ('\xa0');/* { dg-warning "signed conversion" } */
64 ui = '\xa0'; /* { dg-warning "signed conversion" } */
65 fsi (0x80000000); /* { dg-warning "conversion" } */
66 si = 0x80000000; /* { dg-warning "conversion" } */
67
68
69 fsi (UINT_MAX - 1); /* { dg-warning "conversion" } */
70 si = UINT_MAX - 1; /* { dg-warning "conversion" } */
71 fsi (UINT_MAX - 1U); /* { dg-warning "conversion" } */
72 si = UINT_MAX - 1U; /* { dg-warning "conversion" } */
73 fsi (UINT_MAX/3U);
74 si = UINT_MAX/3U;
75 fsi (UINT_MAX/3);
76 si = UINT_MAX/3;
77 fui (UINT_MAX - 1);
78 ui = UINT_MAX - 1;
79
80 uc = (unsigned char) -1;
81 ui = -1 * (1 * -1);
82 ui = (unsigned) -1;
83
84 fsc (uc); /* { dg-warning "conversion" } */
85 sc = uc; /* { dg-warning "conversion" } */
86 fuc (sc); /* { dg-warning "conversion" } */
87 uc = sc; /* { dg-warning "conversion" } */
88 fsi (ui); /* { dg-warning "conversion" } */
89 si = ui; /* { dg-warning "conversion" } */
90 fui (si); /* { dg-warning "conversion" } */
91 ui = si; /* { dg-warning "conversion" } */
92 fui (sc); /* { dg-warning "conversion" } */
93 ui = sc; /* { dg-warning "conversion" } */
94 }
95
fui(unsigned a)96 unsigned fui (unsigned a) { return a + -1; } /* { dg-warning "signed conversion" } */
97
98
99