| // RUN: %clang_cc1 -analyze -analyzer-checker=core,experimental.deadcode.UnreachableCode -Wno-null-dereference -verify %s |
| |
| // Trigger a warning if the analyzer reaches this point in the control flow. |
| #define WARN ((void)*(char*)0) |
| |
| // There should be no warnings unless otherwise indicated. |
| |
| void testComparisons (int a) { |
| // Sema can already catch the simple comparison a==a, |
| // since that's usually a logic error (and not path-dependent). |
| int b = a; |
| if (!(b==a)) WARN; // expected-warning{{never executed}} |
| if (!(b>=a)) WARN; // expected-warning{{never executed}} |
| if (!(b<=a)) WARN; // expected-warning{{never executed}} |
| if (b!=a) WARN; // expected-warning{{never executed}} |
| if (b>a) WARN; // expected-warning{{never executed}} |
| if (b<a) WARN; // expected-warning{{never executed}} |
| } |
| |
| void testSelfOperations (int a) { |
| if ((a|a) != a) WARN; // expected-warning{{never executed}} |
| if ((a&a) != a) WARN; // expected-warning{{never executed}} |
| if ((a^a) != 0) WARN; // expected-warning{{never executed}} |
| if ((a-a) != 0) WARN; // expected-warning{{never executed}} |
| } |
| |
| void testIdempotent (int a) { |
| if ((a*1) != a) WARN; // expected-warning{{never executed}} |
| if ((a/1) != a) WARN; // expected-warning{{never executed}} |
| if ((a+0) != a) WARN; // expected-warning{{never executed}} |
| if ((a-0) != a) WARN; // expected-warning{{never executed}} |
| if ((a<<0) != a) WARN; // expected-warning{{never executed}} |
| if ((a>>0) != a) WARN; // expected-warning{{never executed}} |
| if ((a^0) != a) WARN; // expected-warning{{never executed}} |
| if ((a&(~0)) != a) WARN; // expected-warning{{never executed}} |
| if ((a|0) != a) WARN; // expected-warning{{never executed}} |
| } |
| |
| void testReductionToConstant (int a) { |
| if ((a*0) != 0) WARN; // expected-warning{{never executed}} |
| if ((a&0) != 0) WARN; // expected-warning{{never executed}} |
| if ((a|(~0)) != (~0)) WARN; // expected-warning{{never executed}} |
| } |
| |
| void testSymmetricIntSymOperations (int a) { |
| if ((2+a) != (a+2)) WARN; // expected-warning{{never executed}} |
| if ((2*a) != (a*2)) WARN; // expected-warning{{never executed}} |
| if ((2&a) != (a&2)) WARN; // expected-warning{{never executed}} |
| if ((2^a) != (a^2)) WARN; // expected-warning{{never executed}} |
| if ((2|a) != (a|2)) WARN; // expected-warning{{never executed}} |
| } |
| |
| void testAsymmetricIntSymOperations (int a) { |
| if (((~0) >> a) != (~0)) WARN; // expected-warning{{never executed}} |
| if ((0 >> a) != 0) WARN; // expected-warning{{never executed}} |
| if ((0 << a) != 0) WARN; // expected-warning{{never executed}} |
| |
| // Unsigned right shift shifts in zeroes. |
| if ((((unsigned)(~0)) >> ((unsigned) a)) != ((unsigned)(~0))) |
| WARN; // expected-warning{{}} |
| } |
| |
| void testLocations (char *a) { |
| char *b = a; |
| if (!(b==a)) WARN; // expected-warning{{never executed}} |
| if (!(b>=a)) WARN; // expected-warning{{never executed}} |
| if (!(b<=a)) WARN; // expected-warning{{never executed}} |
| if (b!=a) WARN; // expected-warning{{never executed}} |
| if (b>a) WARN; // expected-warning{{never executed}} |
| if (b<a) WARN; // expected-warning{{never executed}} |
| if (b-a) WARN; // expected-warning{{never executed}} |
| } |
