bool-compare.cpp
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// RUN: %clang_cc1 -fsyntax-only -verify %s
void f(int x, int y, int z) {
bool a,b;
if(b > true) {} // expected-warning {{comparison of true with expression of type 'bool' is always false}}
if(b < true) {} // no warning
if(b >= true) {} // no warning
if(b <= true) {} // expected-warning {{comparison of true with expression of type 'bool' is always true}}
if(b == true) {} // no warning
if(b != true) {} // no warning
if(b > false) {} // no warning
if(b < false) {} // expected-warning {{comparison of false with expression of type 'bool' is always false}}
if(b >= false) {} // expected-warning {{comparison of false with expression of type 'bool' is always true}}
if(b <= false) {} // no warning
if(b == false) {} // no warning
if(b != false) {} // no warning
if(b > 1U){} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always false}}
if (a > b) {} // no warning
if (a < b) {} // no warning
if (a >= b) {} // no warning
if (a <= b) {} // no warning
if (a == b) {} // no warning
if (a != b) {} // no warning
if (a > 0) {} // no warning
if (a > 1) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always false}}
if (a > 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if (a >= 0) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always true}}
if (a >= 1) {} // no warning
if (a >= 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if (a >= -1) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if (a <= 0) {} // no warning
if (a <= 1) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always true}}
if (a <= 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if (a <= -1) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if (!a > 0) {} // no warning
if (!a > 1) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always false}}
if (!a > 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if (!a > y) {} // no warning
if (!a > b) {} // no warning
if (!a > -1) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if (!a < 0) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always false}}
if (!a < 1) {} // no warning
if (!a < 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if (!a < y) {} // no warning
if (!a < b) {} // no warning
if (!a < -1) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if (!a >= 0) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always true}}
if (!a >= 1) {} // no warning
if (!a >= 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if (!a >= y) {} // no warning
if (!a >= b) {} // no warning
if (!a >= -1) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if (!a <= 0) {} // no warning
if (!a <= 1) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always true}}
if (!a <= 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if (!a <= y) {} // no warning
if (!a <= b) {} // no warning
if (!a <= -1) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if ((a||b) > 0) {} // no warning
if ((a||b) > 1) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always false}}
if ((a||b) > 4) {} // expected-warning {{comparison of constant 4 with expression of type 'bool' is always false}}
if ((a||b) > -1) {}// expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if ((a&&b) > 0) {} // no warning
if ((a&&b) > 1) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always false}}
if ((a&&b) > 4) {} // expected-warning {{comparison of constant 4 with expression of type 'bool' is always false}}
if ((a<y) > 0) {} // no warning
if ((a<y) > 1) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always false}}
if ((a<y) > 4) {} // expected-warning {{comparison of constant 4 with expression of type 'bool' is always false}}
if ((a<y) > z) {} // no warning
if ((a<y) > -1) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if ((a<y) == 0) {} // no warning
if ((a<y) == 1) {} // no warning
if ((a<y) == 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if ((a<y) == z) {} // no warning
if ((a<y) == -1) {}// expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if ((a<y) != 0) {} // no warning
if ((a<y) != 1) {} // no warning
if ((a<y) != 2) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if ((a<y) != z) {} // no warning
if ((a<y) != -1) {}// expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if ((a<y) == z) {} // no warning
if (a>y<z) {} // no warning
if ((a<y) > z) {} // no warning
if((a<y)>(z<y)) {} // no warning
if((a<y)==(z<y)){} // no warning
if((a<y)!=(z<y)){} // no warning
if((z==x)<(y==z)){} // no warning
if((a<y)!=((z==x)<(y==z))){} // no warning
if (0 > !a) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always false}}
if (1 > !a) {} // no warning
if (2 > !a) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if (y > !a) {} // no warning
if (-1 > !a) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if (0 < !a) {} // no warning
if (1 < !a) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always false}}
if (2 < !a) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if (y < !a) {} // no warning
if (-1 < !a) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if (0 >= !a) {} // no warning
if (1 >= !a) {} // expected-warning {{comparison of constant 1 with expression of type 'bool' is always true}}
if (2 >= !a) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if (y >= !a) {} // no warning
if (-1 >= !a) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if (0 <= !a) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always true}}
if (1 <= !a) {} // no warning
if (2 <= !a) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if (y <= !a) {} //
if (-1 <= !a) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if (0 > (a||b)) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always false}}
if (1 > (a||b)) {} // no warning
if (4 > (a||b)) {} // expected-warning {{comparison of constant 4 with expression of type 'bool' is always true}}
if (0 > (a&&b)) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always false}}
if (1 > (a&&b)) {} // no warning
if (4 > (a&&b)) {} // expected-warning {{comparison of constant 4 with expression of type 'bool' is always true}}
if (0 > (a<y)) {} // expected-warning {{comparison of constant 0 with expression of type 'bool' is always false}}
if (1 > (a<y)) {} // no warning
if (4 > (a<y)) {} // expected-warning {{comparison of constant 4 with expression of type 'bool' is always true}}
if (z > (a<y)) {} //
if (-1 > (a<y)) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if (0 == (a<y)) {} // no warning
if (1 == (a<y)) {} // no warning
if (2 == (a<y)) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always false}}
if (z == (a<y)) {} // no warning
if (-1 == (a<y)){} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if (0 !=(a<y)) {} // no warning
if (1 !=(a<y)) {} // no warning
if (2 !=(a<y)) {} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if (z !=(a<y)) {} // no warning
if (-1 !=(a<y)) {} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always true}}
if (z ==(a<y)) {} // no warning
if (z<a>y) {} // no warning
if (z > (a<y)) {} // no warning
if((z<y)>(a<y)) {} // no warning
if((z<y)==(a<y)){} // no warning
if((z<y)!=(a<y)){} // no warning
if((y==z)<(z==x)){} // no warning
if(((z==x)<(y==z))!=(a<y)){} // no warning
if(((z==x)<(-1==z))!=(a<y)){} // no warning
if(((z==x)<(z==-1))!=(a<y)){} // no warning
if(((z==x)<-1)!=(a<y)){} // expected-warning {{comparison of constant -1 with expression of type 'bool' is always false}}
if(((z==x)< 2)!=(a<y)){} // expected-warning {{comparison of constant 2 with expression of type 'bool' is always true}}
if(((z==x)<(z>2))!=(a<y)){} // no warning
}
template<typename T, typename U, typename V> struct X6 {
U f(T t, U u, V v) {
// IfStmt
if (t > 0)
return u;
else {
if (t < 0)
return v; // expected-error{{cannot initialize return object of type}}
}
bool r;
// FIXME: We should warn here, DiagRuntimeBehavior does currently not detect this.
if(r<0){}
if (T x = t) {
t = x;
}
return v; // expected-error{{cannot initialize return object of type}}
}
};
struct ConvertibleToInt {
operator int() const;
};
template struct X6<ConvertibleToInt, float, char>;
template struct X6<bool, int, int*>; // expected-note{{instantiation}}