78 lines
3.2 KiB
C
78 lines
3.2 KiB
C
// RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify %s
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void clang_analyzer_eval(int);
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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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clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
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}
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void testSelfOperations (int a) {
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clang_analyzer_eval((a|a) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a&a) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a^a) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((a-a) == 0); // expected-warning{{TRUE}}
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}
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void testIdempotent (int a) {
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clang_analyzer_eval((a*1) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a/1) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a+0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a-0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a<<0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a>>0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a^0) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a&(~0)) == a); // expected-warning{{TRUE}}
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clang_analyzer_eval((a|0) == a); // expected-warning{{TRUE}}
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}
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void testReductionToConstant (int a) {
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clang_analyzer_eval((a*0) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((a&0) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((a|(~0)) == (~0)); // expected-warning{{TRUE}}
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}
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void testSymmetricIntSymOperations (int a) {
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clang_analyzer_eval((2+a) == (a+2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2*a) == (a*2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2&a) == (a&2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2^a) == (a^2)); // expected-warning{{TRUE}}
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clang_analyzer_eval((2|a) == (a|2)); // expected-warning{{TRUE}}
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}
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void testAsymmetricIntSymOperations (int a) {
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clang_analyzer_eval(((~0) >> a) == (~0)); // expected-warning{{TRUE}}
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clang_analyzer_eval((0 >> a) == 0); // expected-warning{{TRUE}}
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clang_analyzer_eval((0 << a) == 0); // expected-warning{{TRUE}}
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// Unsigned right shift shifts in zeroes.
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clang_analyzer_eval(((~0U) >> a) != (~0U)); // expected-warning{{UNKNOWN}}
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}
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void testLocations (char *a) {
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char *b = a;
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clang_analyzer_eval(b == a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b <= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(b != a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b > a); // expected-warning{{FALSE}}
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clang_analyzer_eval(b < a); // expected-warning{{FALSE}}
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}
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void testMixedTypeComparisons (char a, unsigned long b) {
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if (a != 0) return;
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if (b != 0x100) return;
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clang_analyzer_eval(a <= b); // expected-warning{{TRUE}}
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clang_analyzer_eval(b >= a); // expected-warning{{TRUE}}
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clang_analyzer_eval(a != b); // expected-warning{{TRUE}}
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}
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