1 /* Test for diagnostics for constant overflow. */
2 /* Origin: Joseph Myers <joseph@codesourcery.com> */
3 /* { dg-do compile } */
4 /* { dg-options "-std=c99" } */
10 /* Unsigned overflow wraps around. */
12 /* Overflow in an unevaluated part of an expression is OK (example
15 E3 = 1 / 0, /* { dg-warning "warning: division by zero" } */
16 /* { dg-error "error: enumerator value for 'E3' is not an integer constant" "enum error" { target *-*-* } 15 } */
17 /* But as in DR#031, the 1/0 in an evaluated subexpression means the
18 whole expression violates the constraints. */
19 E4 = 0 * (1 / 0), /* { dg-warning "warning: division by zero" } */
20 /* { dg-error "error: enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
21 E5 = INT_MAX + 1, /* { dg-warning "warning: integer overflow in expression" } */
22 /* Again, overflow in evaluated subexpression. */
23 E6 = 0 * (INT_MAX + 1), /* { dg-warning "warning: integer overflow in expression" } */
24 /* A cast does not constitute overflow in conversion. */
30 int : 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
31 int : 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
37 /* This expression is not required to be a constant expression, so
38 it should just involve undefined behavior at runtime. */
39 int c = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
42 /* But this expression does need to be constant. */
43 static int sc = INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
45 /* The first two of these involve overflow, so are not null pointer
46 constants. The third has the overflow in an unevaluated
47 subexpression, so is a null pointer constant. */
48 void *p = 0 * (INT_MAX + 1); /* { dg-warning "warning: integer overflow in expression" } */
49 /* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { target *-*-* } 48 } */
50 void *q = 0 * (1 / 0); /* { dg-warning "warning: division by zero" } */
51 /* { dg-warning "warning: initialization makes pointer from integer without a cast" "null" { xfail *-*-* } 50 } */
52 void *r = (1 ? 0 : INT_MAX+1);
59 case 0 * (1/0): /* { dg-warning "warning: division by zero" } */
61 case 1 + 0 * (INT_MAX + 1): /* { dg-warning "warning: integer overflow in expression" } */
69 return INT_MAX + 1; /* { dg-warning "warning: integer overflow in expression" } */
75 return INT_MAX + 1 - INT_MAX; /* { dg-warning "warning: integer overflow in expression" } */
78 void fuc (unsigned char);
79 void fsc (signed char);
85 fsc (SCHAR_MIN - 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
87 fsc (UCHAR_MAX + 1); /* { dg-warning "warning: overflow in implicit constant conversion" } */
89 fuc (UCHAR_MAX + 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
91 fuc (SCHAR_MIN - 1); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
92 fuc (-UCHAR_MAX); /* { dg-warning "warning: large integer implicitly truncated to unsigned type" } */
95 void fui (unsigned int);
96 void fsi (signed int);
104 /* For some reason, we only give certain warnings for implicit
105 conversions among values of the same precision with -Wconversion,
106 while we don't give others at all. */
107 fsi ((unsigned)INT_MAX + 1);
108 si = (unsigned)INT_MAX + 1;
109 si = x ? (unsigned)INT_MAX + 1 : 1;
110 fsi ((unsigned)INT_MAX + 2);
111 si = (unsigned)INT_MAX + 2;
112 si = x ? (unsigned)INT_MAX + 2 : 1;
120 ui = x ? INT_MIN : 1U;