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 testComparisons(int a)7void 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 testSelfOperations(int a)19void 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 testIdempotent(int a)26void 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 testReductionToConstant(int a)38void 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 testSymmetricIntSymOperations(int a)44void 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 testAsymmetricIntSymOperations(int a)52void 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 testLocations(char * a)61void 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 testMixedTypeComparisons(char a,unsigned long b)71void 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