blob: a22a56765407005d28deaf3b01e960a9d956f854 (
plain)
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
// RUN: %clang_analyze_cc1 -Wno-conversion -analyzer-checker=core,alpha.core.Conversion -verify %s
unsigned char U8;
signed char S8;
void assign(unsigned U, signed S) {
if (S < -10)
U8 = S; // expected-warning {{Loss of sign in implicit conversion}}
if (U > 300)
S8 = U; // expected-warning {{Loss of precision in implicit conversion}}
if (S > 10)
U8 = S; // no-warning
if (U < 200)
S8 = U; // no-warning
}
void addAssign() {
unsigned long L = 1000;
int I = -100;
U8 += L; // expected-warning {{Loss of precision in implicit conversion}}
L += I; // no-warning
}
void subAssign() {
unsigned long L = 1000;
int I = -100;
U8 -= L; // expected-warning {{Loss of precision in implicit conversion}}
L -= I; // no-warning
}
void mulAssign() {
unsigned long L = 1000;
int I = -1;
U8 *= L; // expected-warning {{Loss of precision in implicit conversion}}
L *= I; // expected-warning {{Loss of sign in implicit conversion}}
I = 10;
L *= I; // no-warning
}
void divAssign() {
unsigned long L = 1000;
int I = -1;
U8 /= L; // no-warning
L /= I; // expected-warning {{Loss of sign in implicit conversion}}
}
void remAssign() {
unsigned long L = 1000;
int I = -1;
U8 %= L; // no-warning
L %= I; // expected-warning {{Loss of sign in implicit conversion}}
}
void andAssign() {
unsigned long L = 1000;
int I = -1;
U8 &= L; // no-warning
L &= I; // expected-warning {{Loss of sign in implicit conversion}}
}
void orAssign() {
unsigned long L = 1000;
int I = -1;
U8 |= L; // expected-warning {{Loss of precision in implicit conversion}}
L |= I; // expected-warning {{Loss of sign in implicit conversion}}
}
void xorAssign() {
unsigned long L = 1000;
int I = -1;
U8 ^= L; // expected-warning {{Loss of precision in implicit conversion}}
L ^= I; // expected-warning {{Loss of sign in implicit conversion}}
}
void init1() {
long long A = 1LL << 60;
short X = A; // expected-warning {{Loss of precision in implicit conversion}}
}
void relational(unsigned U, signed S) {
if (S > 10) {
if (U < S) { // no-warning
}
}
if (S < -10) {
if (U < S) { // expected-warning {{Loss of sign in implicit conversion}}
}
}
}
void multiplication(unsigned U, signed S) {
if (S > 5)
S = U * S; // no-warning
if (S < -10)
S = U * S; // expected-warning {{Loss of sign}}
}
void division(unsigned U, signed S) {
if (S > 5)
S = U / S; // no-warning
if (S < -10)
S = U / S; // expected-warning {{Loss of sign}}
}
void dontwarn1(unsigned U, signed S) {
U8 = S; // It might be known that S is always 0x00-0xff.
S8 = U; // It might be known that U is always 0x00-0xff.
U8 = -1; // Explicit conversion.
S8 = ~0U; // Explicit conversion.
if (U > 300)
U8 &= U; // No loss of precision since there is &=.
}
void dontwarn2(unsigned int U) {
if (U <= 4294967295) {
}
if (U <= (2147483647 * 2U + 1U)) {
}
}
void dontwarn3(int X) {
S8 = X ? 'a' : 'b';
}
// don't warn for macros
#define DOSTUFF ({ unsigned X = 1000; U8 = X; })
void dontwarn4() {
DOSTUFF;
}
// don't warn for calculations
// seen some fp. For instance: c2 = (c2 >= 'A' && c2 <= 'Z') ? c2 - 'A' + 'a' : c2;
// there is a todo in the checker to handle calculations
void dontwarn5() {
signed S = -32;
U8 = S + 10;
}
// false positives..
int isascii(int c);
void falsePositive1() {
char kb2[5];
int X = 1000;
if (isascii(X)) {
// FIXME: should not warn here:
kb2[0] = X; // expected-warning {{Loss of precision}}
}
}
typedef struct FILE {} FILE; int getc(FILE *stream);
# define EOF (-1)
char reply_string[8192];
FILE *cin;
extern int dostuff (void);
int falsePositive2() {
int c, n;
int dig;
char *cp = reply_string;
int pflag = 0;
int code;
for (;;) {
dig = n = code = 0;
while ((c = getc(cin)) != '\n') {
if (dig < 4 && dostuff())
code = code * 10 + (c - '0');
if (!pflag && code == 227)
pflag = 1;
if (n == 0)
n = c;
if (c == EOF)
return(4);
if (cp < &reply_string[sizeof(reply_string) - 1])
// FIXME: should not warn here:
*cp++ = c; // expected-warning {{Loss of precision}}
}
}
}
|
