1 // RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify %s
2 
3 void clang_analyzer_eval(int);
4 
5 // There should be no warnings unless otherwise indicated.
6 
7 void 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 
19 void 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 
26 void 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 
38 void 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 
44 void 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 
52 void 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 
61 void 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 
71 void 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