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
|
// RUN: %clang_analyze_cc1 -triple x86_64-apple-darwin10 -analyzer-checker=core,debug.ExprInspection %s -std=c++11 -verify
void clang_analyzer_eval(bool);
void clang_analyzer_warnIfReached();
void testAddressof(int x) {
clang_analyzer_eval(&x == __builtin_addressof(x)); // expected-warning{{TRUE}}
}
void testSize() {
struct {
int x;
int y;
char z;
} object;
clang_analyzer_eval(__builtin_object_size(&object.y, 0) == sizeof(object) - sizeof(int)); // expected-warning{{TRUE}}
// Clang can't actually evaluate these builtin "calls", but importantly they don't actually evaluate the argument expression either.
int i = 0;
char buf[10];
clang_analyzer_eval(__builtin_object_size(&buf[i++], 0) == sizeof(buf)); // expected-warning{{FALSE}}
clang_analyzer_eval(__builtin_object_size(&buf[++i], 0) == sizeof(buf) - 1); // expected-warning{{FALSE}}
clang_analyzer_eval(i == 0); // expected-warning{{TRUE}}
}
void test_assume_aligned_1(char *p) {
char *q;
q = (char*) __builtin_assume_aligned(p, 16);
clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
}
void test_assume_aligned_2(char *p) {
char *q;
q = (char*) __builtin_assume_aligned(p, 16, 8);
clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
}
void test_assume_aligned_3(char *p) {
void *q;
q = __builtin_assume_aligned(p, 16, 8);
clang_analyzer_eval(p == q); // expected-warning{{TRUE}}
}
void test_assume_aligned_4(char *p) {
char *q;
q = (char*) __builtin_assume_aligned(p + 1, 16);
clang_analyzer_eval(p == q); // expected-warning{{FALSE}}
}
void f(int i) {
__builtin_assume(i < 10);
clang_analyzer_eval(i < 15); // expected-warning {{TRUE}}
}
void g(int i) {
if (i > 5) {
__builtin_assume(i < 5);
clang_analyzer_warnIfReached(); // Assumtion contradicts constraints.
// We give up the analysis on this path.
}
}
|
