1 // RUN: %clang_analyze_cc1 %s \ 2 // RUN: -analyzer-checker=core \ 3 // RUN: -analyzer-checker=debug.ExprInspection \ 4 // RUN: -analyzer-config support-symbolic-integer-casts=true \ 5 // RUN: -analyzer-config eagerly-assume=false \ 6 // RUN: -triple x86_64-unknown-linux-gnu \ 7 // RUN: -verify 8 9 // Test that the SValBuilder is able to look up and use a constraint for an 10 // operand of a SymbolCast, when the operand is constrained to a const value. 11 12 void clang_analyzer_eval(bool); 13 14 extern void abort() __attribute__((__noreturn__)); 15 #define assert(expr) ((expr) ? (void)(0) : abort()) 16 17 void test(int x) { 18 // Constrain a SymSymExpr to a constant value. 19 assert(x * x == 1); 20 // It is expected to be able to get the constraint for the operand of the 21 // cast. 22 clang_analyzer_eval((char)(x * x) == 1); // expected-warning{{TRUE}} 23 clang_analyzer_eval((long)(x * x) == 1); // expected-warning{{TRUE}} 24 } 25 26 void test1(int x, int y) { 27 // Even if two lower bytes of `x` equal to zero, it doesn't mean that 28 // the entire `x` is zero. We are not able to know the exact value of x. 29 // It can be one of 65536 possible values like 30 // [0, 65536, -65536, 131072, -131072, ...]. To avoid huge range sets we 31 // still assume `x` in the range [INT_MIN, INT_MAX]. 32 assert((short)x == 0); // Lower two bytes are set to 0. 33 34 static_assert((short)65536 == 0, ""); 35 static_assert((short)-65536 == 0, ""); 36 static_assert((short)131072 == 0, ""); 37 static_assert((short)-131072 == 0, ""); 38 clang_analyzer_eval(x == 0); // expected-warning{{UNKNOWN}} 39 40 // These are not truncated to short as zero. 41 static_assert((short)1 != 0, ""); 42 clang_analyzer_eval(x == 1); // expected-warning{{FALSE}} 43 static_assert((short)-1 != 0, ""); 44 clang_analyzer_eval(x == -1); // expected-warning{{FALSE}} 45 static_assert((short)65537 != 0, ""); 46 clang_analyzer_eval(x == 65537); // expected-warning{{FALSE}} 47 static_assert((short)-65537 != 0, ""); 48 clang_analyzer_eval(x == -65537); // expected-warning{{FALSE}} 49 static_assert((short)131073 != 0, ""); 50 clang_analyzer_eval(x == 131073); // expected-warning{{FALSE}} 51 static_assert((short)-131073 != 0, ""); 52 clang_analyzer_eval(x == -131073); // expected-warning{{FALSE}} 53 54 // Check for implicit cast. 55 short s = y; 56 assert(s == 0); 57 clang_analyzer_eval(y == 0); // expected-warning{{UNKNOWN}} 58 } 59