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