1/* Test for diagnostics for constant overflow.  Test with -pedantic.  */
2/* Origin: Joseph Myers <joseph@codesourcery.com> */
3/* { dg-do compile } */
4/* { dg-options "-fpermissive -pedantic" } */
5
6#include <limits.h>
7
8enum e {
9  E0 = INT_MAX,
10  /* Unsigned overflow wraps around.  */
11  E1 = UINT_MAX + 1,
12  /* Overflow in an unevaluated part of an expression is OK (example
13     in the standard).  */
14  E2 = 2 || 1 / 0, /* { dg-bogus "warning: division by zero" "" { xfail *-*-* } 14 } */
15  E3 = 1 / 0, /* { dg-warning "division by zero" } */
16  /* { dg-error "enumerator value for 'E3' is not an integer constant|not a constant.expression" "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 "division by zero" } */
20  /* { dg-error "enumerator value for 'E4' is not an integer constant" "enum error" { xfail *-*-* } 19 } */
21  E5 = INT_MAX + 1, /* { dg-warning "integer overflow in expression" } */
22  /* { dg-warning "overflow in constant expression" "constant" { target *-*-* } 21 } */
23  /* Again, overflow in evaluated subexpression.  */
24  E6 = 0 * (INT_MAX + 1), /* { dg-warning "integer overflow in expression" } */
25  /* { dg-warning "overflow in constant expression" "constant" { target *-*-* } 24 } */
26  /* A cast does not constitute overflow in conversion.  */
27  E7 = (char) INT_MAX
28};
29
30struct s {
31  int a;
32  int : 0 * (1 / 0); /* { dg-warning "division by zero" } */
33  int : 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
34  /* { dg-warning "overflow in constant expression" "constant" { target *-*-* } 33 } */
35};
36
37void
38f (void)
39{
40  /* This expression is not required to be a constant expression, so
41     it should just involve undefined behavior at runtime.  */
42  int c = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
43
44}
45
46/* This expression is neither required to be constant.  */
47static int sc = INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
48
49
50// Test for overflow in null pointer constant.
51void *n = 0;
52/* The first two of these involve overflow, so are not null pointer
53   constants.  The third has the overflow in an unevaluated
54   subexpression, so is a null pointer constant.  */
55void *p = 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
56/* { dg-warning "invalid conversion from 'int' to 'void" "null" { target *-*-* } 55 } */
57
58void *q = 0 * (1 / 0); /* { dg-warning "division by zero" } */
59/* { dg-warning "invalid conversion from 'int' to 'void*'" "null" { xfail *-*-* } 58 } */
60void *r = (1 ? 0 : INT_MAX+1); /* { dg-bogus "integer overflow in expression" "" { xfail *-*-* } } */
61
62void
63g (int i)
64{
65  switch (i)
66    {
67    case 0 * (1/0): /* { dg-warning "division by zero" } */
68      ;
69    case 1 + 0 * (INT_MAX + 1): /* { dg-warning "integer overflow in expression" } */
70      /* { dg-warning "overflow in constant expression" "constant" { target *-*-* } 69 } */
71      ;
72    }
73}
74
75int
76h (void)
77{
78  return INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
79}
80
81int
82h1 (void)
83{
84  return INT_MAX + 1 - INT_MAX; /* { dg-warning "integer overflow in expression" } */
85}
86
87void fuc (unsigned char);
88void fsc (signed char);
89
90void
91h2 (void)
92{
93  fsc (SCHAR_MAX + 1); /* { dg-warning "overflow in implicit constant conversion" } */
94  fsc (SCHAR_MIN - 1); /* { dg-warning "overflow in implicit constant conversion" } */
95  fsc (UCHAR_MAX); /* { dg-warning "overflow in implicit constant conversion" } */
96  fsc (UCHAR_MAX + 1); /* { dg-warning "overflow in implicit constant conversion" } */
97  fuc (-1);
98  fuc (UCHAR_MAX + 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
99  fuc (SCHAR_MIN);
100  fuc (SCHAR_MIN - 1); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
101  fuc (-UCHAR_MAX); /* { dg-warning "large integer implicitly truncated to unsigned type" } */
102}
103
104void fui (unsigned int);
105void fsi (signed int);
106
107int si;
108unsigned ui;
109
110void
111h2i (int x)
112{
113  /* For some reason, we only give certain warnings for implicit
114     conversions among values of the same precision with -Wconversion,
115     while we don't give others at all.  */
116  fsi ((unsigned)INT_MAX + 1);
117  si = (unsigned)INT_MAX + 1;
118  si = x ? (unsigned)INT_MAX + 1 : 1;
119  fsi ((unsigned)INT_MAX + 2);
120  si = (unsigned)INT_MAX + 2;
121  si = x ? (unsigned)INT_MAX + 2 : 1;
122  fsi (UINT_MAX);
123  si = UINT_MAX;
124  fui (-1);
125  ui = -1;
126  ui = x ? -1 : 1U;
127  fui (INT_MIN);
128  ui = INT_MIN;
129  ui = x ? INT_MIN : 1U;
130}
131