xref: /minix3/external/bsd/llvm/dist/clang/test/Analysis/constant-folding.c (revision f4a2713ac843a11c696ec80c0a5e3e5d80b4d338) 
1*f4a2713aSLionel Sambuc // RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify %s
2*f4a2713aSLionel Sambuc 
3*f4a2713aSLionel Sambuc void clang_analyzer_eval(int);
4*f4a2713aSLionel Sambuc 
5*f4a2713aSLionel Sambuc // There should be no warnings unless otherwise indicated.
6*f4a2713aSLionel Sambuc 
testComparisons(int a)7*f4a2713aSLionel Sambuc void testComparisons (int a) {
8*f4a2713aSLionel Sambuc   // Sema can already catch the simple comparison a==a,
9*f4a2713aSLionel Sambuc   // since that's usually a logic error (and not path-dependent).
10*f4a2713aSLionel Sambuc   int b = a;
11*f4a2713aSLionel Sambuc   clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
12*f4a2713aSLionel Sambuc   clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
13*f4a2713aSLionel Sambuc   clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
14*f4a2713aSLionel Sambuc   clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
15*f4a2713aSLionel Sambuc   clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
16*f4a2713aSLionel Sambuc   clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
17*f4a2713aSLionel Sambuc }
18*f4a2713aSLionel Sambuc 
testSelfOperations(int a)19*f4a2713aSLionel Sambuc void testSelfOperations (int a) {
20*f4a2713aSLionel Sambuc   clang_analyzer_eval((a|a) == a); // expected-warning{{TRUE}}
21*f4a2713aSLionel Sambuc   clang_analyzer_eval((a&a) == a); // expected-warning{{TRUE}}
22*f4a2713aSLionel Sambuc   clang_analyzer_eval((a^a) == 0); // expected-warning{{TRUE}}
23*f4a2713aSLionel Sambuc   clang_analyzer_eval((a-a) == 0); // expected-warning{{TRUE}}
24*f4a2713aSLionel Sambuc }
25*f4a2713aSLionel Sambuc 
testIdempotent(int a)26*f4a2713aSLionel Sambuc void testIdempotent (int a) {
27*f4a2713aSLionel Sambuc   clang_analyzer_eval((a*1) == a); // expected-warning{{TRUE}}
28*f4a2713aSLionel Sambuc   clang_analyzer_eval((a/1) == a); // expected-warning{{TRUE}}
29*f4a2713aSLionel Sambuc   clang_analyzer_eval((a+0) == a); // expected-warning{{TRUE}}
30*f4a2713aSLionel Sambuc   clang_analyzer_eval((a-0) == a); // expected-warning{{TRUE}}
31*f4a2713aSLionel Sambuc   clang_analyzer_eval((a<<0) == a); // expected-warning{{TRUE}}
32*f4a2713aSLionel Sambuc   clang_analyzer_eval((a>>0) == a); // expected-warning{{TRUE}}
33*f4a2713aSLionel Sambuc   clang_analyzer_eval((a^0) == a); // expected-warning{{TRUE}}
34*f4a2713aSLionel Sambuc   clang_analyzer_eval((a&(~0)) == a); // expected-warning{{TRUE}}
35*f4a2713aSLionel Sambuc   clang_analyzer_eval((a|0) == a); // expected-warning{{TRUE}}
36*f4a2713aSLionel Sambuc }
37*f4a2713aSLionel Sambuc 
testReductionToConstant(int a)38*f4a2713aSLionel Sambuc void testReductionToConstant (int a) {
39*f4a2713aSLionel Sambuc   clang_analyzer_eval((a*0) == 0); // expected-warning{{TRUE}}
40*f4a2713aSLionel Sambuc   clang_analyzer_eval((a&0) == 0); // expected-warning{{TRUE}}
41*f4a2713aSLionel Sambuc   clang_analyzer_eval((a|(~0)) == (~0)); // expected-warning{{TRUE}}
42*f4a2713aSLionel Sambuc }
43*f4a2713aSLionel Sambuc 
testSymmetricIntSymOperations(int a)44*f4a2713aSLionel Sambuc void testSymmetricIntSymOperations (int a) {
45*f4a2713aSLionel Sambuc   clang_analyzer_eval((2+a) == (a+2)); // expected-warning{{TRUE}}
46*f4a2713aSLionel Sambuc   clang_analyzer_eval((2*a) == (a*2)); // expected-warning{{TRUE}}
47*f4a2713aSLionel Sambuc   clang_analyzer_eval((2&a) == (a&2)); // expected-warning{{TRUE}}
48*f4a2713aSLionel Sambuc   clang_analyzer_eval((2^a) == (a^2)); // expected-warning{{TRUE}}
49*f4a2713aSLionel Sambuc   clang_analyzer_eval((2|a) == (a|2)); // expected-warning{{TRUE}}
50*f4a2713aSLionel Sambuc }
51*f4a2713aSLionel Sambuc 
testAsymmetricIntSymOperations(int a)52*f4a2713aSLionel Sambuc void testAsymmetricIntSymOperations (int a) {
53*f4a2713aSLionel Sambuc   clang_analyzer_eval(((~0) >> a) == (~0)); // expected-warning{{TRUE}}
54*f4a2713aSLionel Sambuc   clang_analyzer_eval((0 >> a) == 0); // expected-warning{{TRUE}}
55*f4a2713aSLionel Sambuc   clang_analyzer_eval((0 << a) == 0); // expected-warning{{TRUE}}
56*f4a2713aSLionel Sambuc 
57*f4a2713aSLionel Sambuc   // Unsigned right shift shifts in zeroes.
58*f4a2713aSLionel Sambuc   clang_analyzer_eval(((~0U) >> a) != (~0U)); // expected-warning{{UNKNOWN}}
59*f4a2713aSLionel Sambuc }
60*f4a2713aSLionel Sambuc 
testLocations(char * a)61*f4a2713aSLionel Sambuc void testLocations (char *a) {
62*f4a2713aSLionel Sambuc   char *b = a;
63*f4a2713aSLionel Sambuc   clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
64*f4a2713aSLionel Sambuc   clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
65*f4a2713aSLionel Sambuc   clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
66*f4a2713aSLionel Sambuc   clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
67*f4a2713aSLionel Sambuc   clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
68*f4a2713aSLionel Sambuc   clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
69*f4a2713aSLionel Sambuc }
70*f4a2713aSLionel Sambuc 
testMixedTypeComparisons(char a,unsigned long b)71*f4a2713aSLionel Sambuc void testMixedTypeComparisons (char a, unsigned long b) {
72*f4a2713aSLionel Sambuc   if (a != 0) return;
73*f4a2713aSLionel Sambuc   if (b != 0x100) return;
74*f4a2713aSLionel Sambuc 
75*f4a2713aSLionel Sambuc   clang_analyzer_eval(a <= b); // expected-warning{{TRUE}}
76*f4a2713aSLionel Sambuc   clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
77*f4a2713aSLionel Sambuc   clang_analyzer_eval(a != b); // expected-warning{{TRUE}}
78*f4a2713aSLionel Sambuc }
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