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111
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1 /* Test for diagnostics for constant overflow. */
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2 /* Origin: Joseph Myers <joseph@codesourcery.com> */
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3 /* { dg-do compile } */
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4 /* { dg-options "-std=c99" } */
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5
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6 #include <limits.h>
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7
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8 enum e {
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9 E0 = INT_MAX,
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10 /* Unsigned overflow wraps around. */
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11 E1 = UINT_MAX + 1,
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12 /* Overflow in an unevaluated part of an expression is OK (example
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13 in the standard). */
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14 E2 = 2 || 1 / 0,
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15 E3 = 1 / 0, /* { dg-warning "10:division by zero" } */
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16 /* { dg-error "3:enumerator value for 'E3' is not an integer constant" "enum error" { target *-*-* } .-1 } */
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17 /* But as in DR#031, the 1/0 in an evaluated subexpression means the
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18 whole expression violates the constraints. */
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19 E4 = 0 * (1 / 0), /* { dg-warning "15:division by zero" } */
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20 /* { dg-error "enumerator value for 'E4' is not an integer constant" "enum error" { target *-*-* } .-1 } */
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21 E5 = INT_MAX + 1, /* { dg-warning "16:integer overflow in expression" } */
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22 /* Again, overflow in evaluated subexpression. */
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23 E6 = 0 * (INT_MAX + 1), /* { dg-warning "21:integer overflow in expression" } */
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24 /* A cast does not constitute overflow in conversion. */
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25 E7 = (char) INT_MAX
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26 };
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27
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28 struct s {
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29 int a;
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30 int : 0 * (1 / 0); /* { dg-warning "16:division by zero" } */
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31 /* { dg-error "not an integer constant" "22:integer constant" { target *-*-* } .-1 } */
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32 int : 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
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33 };
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34
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35 void
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36 f (void)
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37 {
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38 /* This expression is not required to be a constant expression, so
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39 it should just involve undefined behavior at runtime. */
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40 int c = INT_MAX + 1; /* { dg-warning "19:integer overflow in expression" } */
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41 }
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42
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43 /* But this expression does need to be constant. */
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44 static int sc = INT_MAX + 1; /* { dg-warning "25:integer overflow in expression" } */
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45
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46 /* The first two of these involve overflow, so are not null pointer
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47 constants. The third has the overflow in an unevaluated
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48 subexpression, so is a null pointer constant. */
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49 void *p = 0 * (INT_MAX + 1); /* { dg-warning "integer overflow in expression" } */
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50 /* { dg-warning "initialization of 'void \\*' from 'int' makes pointer from integer without a cast" "null" { target *-*-* } .-1 } */
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51 void *q = 0 * (1 / 0); /* { dg-warning "division by zero" } */
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52 /* { dg-error "initializer element is not constant" "constant" { target *-*-* } .-1 } */
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53 /* { dg-warning "initialization of 'void \\*' from 'int' makes pointer from integer without a cast" "null" { target *-*-* } .-2 } */
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54 void *r = (1 ? 0 : INT_MAX+1);
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55
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56 void
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57 g (int i)
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58 {
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59 switch (i)
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60 {
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61 case 0 * (1/0): /* { dg-warning "division by zero" } */
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62 /* { dg-error "case label does not reduce to an integer constant" "constant" { target *-*-* } .-1 } */
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63 ;
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64 case 1 + 0 * (INT_MAX + 1): /* { dg-warning "integer overflow in expression" } */
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65 ;
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66 }
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67 }
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68
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69 int
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70 h (void)
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71 {
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72 return INT_MAX + 1; /* { dg-warning "integer overflow in expression" } */
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73 }
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74
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75 int
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76 h1 (void)
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77 {
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78 return INT_MAX + 1 - INT_MAX; /* { dg-warning "integer overflow in expression" } */
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79 }
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80
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81 void fuc (unsigned char);
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82 void fsc (signed char);
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83
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84 void
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85 h2 (void)
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86 {
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87 fsc (SCHAR_MAX + 1);
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88 fsc (SCHAR_MIN - 1); /* { dg-warning "overflow in conversion from .int. to .signed char. changes value " } */
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89 fsc (UCHAR_MAX);
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90 fsc (UCHAR_MAX + 1); /* { dg-warning "overflow in conversion from .int. to .signed char. changes value from " } */
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91 fuc (-1);
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92 fuc (UCHAR_MAX + 1); /* { dg-warning "unsigned conversion from .int. to .unsigned char. changes value " } */
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93 fuc (SCHAR_MIN);
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94 fuc (SCHAR_MIN - 1); /* { dg-warning "unsigned conversion from .int. to .unsigned char. changes value " } */
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95 fuc (-UCHAR_MAX); /* { dg-warning "unsigned conversion from .int. to .unsigned char. changes value " } */
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96 }
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97
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98 void fui (unsigned int);
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99 void fsi (signed int);
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100
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101 int si;
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102 unsigned ui;
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103
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104 void
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105 h2i (int x)
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106 {
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107 /* For some reason, we only give certain warnings for implicit
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108 conversions among values of the same precision with -Wconversion,
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109 while we don't give others at all. */
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110 fsi ((unsigned)INT_MAX + 1);
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111 si = (unsigned)INT_MAX + 1;
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112 si = x ? (unsigned)INT_MAX + 1 : 1;
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113 fsi ((unsigned)INT_MAX + 2);
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114 si = (unsigned)INT_MAX + 2;
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115 si = x ? (unsigned)INT_MAX + 2 : 1;
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116 fsi (UINT_MAX);
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117 si = UINT_MAX;
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118 fui (-1);
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119 ui = -1;
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120 ui = x ? -1 : 1U;
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121 fui (INT_MIN);
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122 ui = INT_MIN;
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123 ui = x ? INT_MIN : 1U;
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124 }
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