42 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-negation-compare -Wno-constant-logical-operand %s2// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-compare -Wno-constant-logical-operand %s3// RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused -Wno-loop-analysis -Wno-constant-logical-operand %s4 5#define COPY(x) x6 7void test_int(int x) {8 if (x || !x) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}9 if (!x || x) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}10 if (x && !x) {} // expected-warning {{'&&' of a value and its negation always evaluates to false}}11 if (!x && x) {} // expected-warning {{'&&' of a value and its negation always evaluates to false}}12 13 // parentheses are ignored14 if (x || (!x)) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}15 if (!(x) || x) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}16 17 // don't warn on macros18 if (COPY(x) || !x) {}19 if (!x || COPY(x)) {}20 if (x && COPY(!x)) {}21 if (COPY(!x && x)) {}22 23 // dont' warn on literals24 if (1 || !1) {}25 if (!42 && 42) {}26 27 28 // don't warn on overloads29 struct Foo{30 int val;31 Foo operator!() const { return Foo{!val}; }32 bool operator||(const Foo other) const { return val || other.val; }33 bool operator&&(const Foo other) const { return val && other.val; }34 };35 36 Foo f{3};37 if (f || !f) {}38 if (!f || f) {}39 if (f.val || !f.val) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}40 if (!f.val && f.val) {} // expected-warning {{'&&' of a value and its negation always evaluates to false}}41}42