bugprone-integer-division.cpp
3.63 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
// RUN: %check_clang_tidy %s bugprone-integer-division %t
// Functions expecting a floating-point parameter.
void floatArg(float x) {}
void doubleArg(double x) {}
void longDoubleArg(long double x) {}
// Functions expected to return a floating-point value.
float singleDiv() {
int x = -5;
int y = 2;
return x/y;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: result of integer division used in
}
double wrongOrder(int x, int y) {
return x/y/0.1;
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: result of integer division used in
}
long double rightOrder(int x, int y) {
return 0.1/x/y; // OK
}
// Typical mathematical functions.
float sin(float);
double acos(double);
long double tanh(long double);
namespace std {
using ::sin;
}
template <typename T>
void intDivSin(T x) {
sin(x);
}
int intFunc(int);
struct X {
int n;
void m() {
sin(n / 3);
// CHECK-MESSAGES: :[[@LINE-1]]:9: warning: result of integer division used in
}
};
void integerDivision() {
char a = 2;
short b = -5;
int c = 9784;
enum third { x, y, z=2 };
third d = z;
char e[] = {'a', 'b', 'c'};
char f = *(e + 1 / a);
bool g = 1;
sin(1 + c / (2 + 2));
// CHECK-MESSAGES: :[[@LINE-1]]:11: warning: result of integer division used in
sin(c / (1 + .5));
sin((c + .5) / 3);
sin(intFunc(3) / 5);
// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: result of integer division used in
acos(2 / intFunc(7));
// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
floatArg(1 + 2 / 3);
// CHECK-MESSAGES: :[[@LINE-1]]:16: warning: result of integer division used in
sin(1 + 2 / 3);
// CHECK-MESSAGES: :[[@LINE-1]]:11: warning: result of integer division used in
intFunc(sin(1 + 2 / 3));
// CHECK-MESSAGES: :[[@LINE-1]]:19: warning: result of integer division used in
floatArg(1 + intFunc(1 + 2 / 3));
floatArg(1 + 3 * intFunc(a / b));
1 << (2 / 3);
1 << intFunc(2 / 3);
#define M_SIN sin(a / b);
M_SIN
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: result of integer division used in
intDivSin<float>(a / b);
// CHECK-MESSAGES: :[[@LINE-1]]:20: warning: result of integer division used in
intDivSin<double>(c / d);
// CHECK-MESSAGES: :[[@LINE-1]]:21: warning: result of integer division used in
intDivSin<long double>(f / g);
// CHECK-MESSAGES: :[[@LINE-1]]:26: warning: result of integer division used in
floatArg(1 / 3);
// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: result of integer division used in
doubleArg(a / b);
// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: result of integer division used in
longDoubleArg(3 / d);
// CHECK-MESSAGES: :[[@LINE-1]]:17: warning: result of integer division used in
floatArg(a / b / 0.1);
// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: result of integer division used in
doubleArg(1 / 3 / 0.1);
// CHECK-MESSAGES: :[[@LINE-1]]:13: warning: result of integer division used in
longDoubleArg(2 / 3 / 5);
// CHECK-MESSAGES: :[[@LINE-1]]:17: warning: result of integer division used in
std::sin(2 / 3);
// CHECK-MESSAGES: :[[@LINE-1]]:12: warning: result of integer division used in
::acos(7 / d);
// CHECK-MESSAGES: :[[@LINE-1]]:10: warning: result of integer division used in
tanh(f / g);
// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
floatArg(0.1 / a / b);
doubleArg(0.1 / 3 / 1);
singleDiv();
wrongOrder(a,b);
rightOrder(a,b);
sin(a / b);
// CHECK-MESSAGES: :[[@LINE-1]]:7: warning: result of integer division used in
acos(f / d);
// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
tanh(c / g);
// CHECK-MESSAGES: :[[@LINE-1]]:8: warning: result of integer division used in
sin(3.0 / a);
acos(b / 3.14);
tanh(3.14 / f / g);
}