1// RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify %s
2
3void clang_analyzer_eval(int);
4
5// There should be no warnings unless otherwise indicated.
6
7void testComparisons (int a) {
8  // Sema can already catch the simple comparison a==a,
9  // since that's usually a logic error (and not path-dependent).
10  int b = a;
11  clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
12  clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
13  clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
14  clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
15  clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
16  clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
17}
18
19void testSelfOperations (int a) {
20  clang_analyzer_eval((a|a) == a); // expected-warning{{TRUE}}
21  clang_analyzer_eval((a&a) == a); // expected-warning{{TRUE}}
22  clang_analyzer_eval((a^a) == 0); // expected-warning{{TRUE}}
23  clang_analyzer_eval((a-a) == 0); // expected-warning{{TRUE}}
24}
25
26void testIdempotent (int a) {
27  clang_analyzer_eval((a*1) == a); // expected-warning{{TRUE}}
28  clang_analyzer_eval((a/1) == a); // expected-warning{{TRUE}}
29  clang_analyzer_eval((a+0) == a); // expected-warning{{TRUE}}
30  clang_analyzer_eval((a-0) == a); // expected-warning{{TRUE}}
31  clang_analyzer_eval((a<<0) == a); // expected-warning{{TRUE}}
32  clang_analyzer_eval((a>>0) == a); // expected-warning{{TRUE}}
33  clang_analyzer_eval((a^0) == a); // expected-warning{{TRUE}}
34  clang_analyzer_eval((a&(~0)) == a); // expected-warning{{TRUE}}
35  clang_analyzer_eval((a|0) == a); // expected-warning{{TRUE}}
36}
37
38void testReductionToConstant (int a) {
39  clang_analyzer_eval((a*0) == 0); // expected-warning{{TRUE}}
40  clang_analyzer_eval((a&0) == 0); // expected-warning{{TRUE}}
41  clang_analyzer_eval((a|(~0)) == (~0)); // expected-warning{{TRUE}}
42}
43
44void testSymmetricIntSymOperations (int a) {
45  clang_analyzer_eval((2+a) == (a+2)); // expected-warning{{TRUE}}
46  clang_analyzer_eval((2*a) == (a*2)); // expected-warning{{TRUE}}
47  clang_analyzer_eval((2&a) == (a&2)); // expected-warning{{TRUE}}
48  clang_analyzer_eval((2^a) == (a^2)); // expected-warning{{TRUE}}
49  clang_analyzer_eval((2|a) == (a|2)); // expected-warning{{TRUE}}
50}
51
52void testAsymmetricIntSymOperations (int a) {
53  clang_analyzer_eval(((~0) >> a) == (~0)); // expected-warning{{TRUE}}
54  clang_analyzer_eval((0 >> a) == 0); // expected-warning{{TRUE}}
55  clang_analyzer_eval((0 << a) == 0); // expected-warning{{TRUE}}
56
57  // Unsigned right shift shifts in zeroes.
58  clang_analyzer_eval(((~0U) >> a) != (~0U)); // expected-warning{{UNKNOWN}}
59}
60
61void testLocations (char *a) {
62  char *b = a;
63  clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
64  clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
65  clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
66  clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
67  clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
68  clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
69}
70
71void testMixedTypeComparisons (char a, unsigned long b) {
72  if (a != 0) return;
73  if (b != 0x100) return;
74
75  clang_analyzer_eval(a <= b); // expected-warning{{TRUE}}
76  clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
77  clang_analyzer_eval(a != b); // expected-warning{{TRUE}}
78}
79