163 lines
3.7 KiB
C++
163 lines
3.7 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -Wself-assign-field -DDUMMY -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wself-assign-field -DV0 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wself-assign-field -DV1 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wself-assign-field -DV2 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wself-assign-field -DV3 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wself-assign-field -DV4 -verify %s
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#ifdef DUMMY
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struct S {};
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#else
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struct S {
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#if defined(V0)
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S() = default;
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#elif defined(V1)
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S &operator=(const S &) = default;
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#elif defined(V2)
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S &operator=(S &) = default;
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#elif defined(V3)
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S &operator=(const S &);
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#elif defined(V4)
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S &operator=(S &);
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#else
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#error Define something!
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#endif
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S &operator*=(const S &);
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S &operator/=(const S &);
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S &operator%=(const S &);
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S &operator+=(const S &);
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S &operator-=(const S &);
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S &operator<<=(const S &);
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S &operator>>=(const S &);
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S &operator&=(const S &);
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S &operator|=(const S &);
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S &operator^=(const S &);
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S &operator=(const volatile S &) volatile;
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};
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#endif
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struct C {
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S a;
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S b;
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void f() {
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a = a; // expected-warning {{assigning field to itself}}
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b = b; // expected-warning {{assigning field to itself}}
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a = b;
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this->a = a; // expected-warning {{assigning field to itself}}
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this->b = b; // expected-warning {{assigning field to itself}}
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a = this->a; // expected-warning {{assigning field to itself}}
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b = this->b; // expected-warning {{assigning field to itself}}
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this->a = this->a; // expected-warning {{assigning field to itself}}
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this->b = this->b; // expected-warning {{assigning field to itself}}
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a = b;
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a = this->b;
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this->a = b;
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this->a = this->b;
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#ifndef DUMMY
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a *= a;
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a /= a; // expected-warning {{assigning field to itself}}
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a %= a; // expected-warning {{assigning field to itself}}
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a += a;
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a -= a; // expected-warning {{assigning field to itself}}
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a <<= a;
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a >>= a;
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a &= a; // expected-warning {{assigning field to itself}}
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a |= a; // expected-warning {{assigning field to itself}}
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a ^= a; // expected-warning {{assigning field to itself}}
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#endif
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}
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void false_positives() {
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#define OP =
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#define LHS a
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#define RHS a
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// These shouldn't warn due to the use of the preprocessor.
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a OP a;
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LHS = a;
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a = RHS;
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LHS OP RHS;
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#undef OP
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#undef LHS
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#undef RHS
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// Ways to silence the warning.
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a = *&a;
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a = (S &)a;
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a = static_cast<decltype(a) &>(a);
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}
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#ifndef DUMMY
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volatile S vol_a;
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void vol_test() {
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// Volatile stores aren't side-effect free.
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vol_a = vol_a;
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volatile S &vol_a_ref = vol_a;
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vol_a_ref = vol_a_ref;
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}
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#endif
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};
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// Do not diagnose self-assigment in an unevaluated context
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struct SNoExcept {
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SNoExcept() = default;
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SNoExcept &operator=(const SNoExcept &) noexcept;
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};
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struct false_positives_unevaluated_ctx_class {
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SNoExcept a;
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void false_positives_unevaluated_ctx(SNoExcept a) noexcept(noexcept(a = a)) {
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decltype(a = a) b = a;
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static_assert(noexcept(a = a), "");
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static_assert(sizeof(a = a), "");
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}
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};
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template <typename T>
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struct TemplateClass {
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T var;
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void f() {
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var = var; // expected-warning {{assigning field to itself}}
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}
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};
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void instantiate() {
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{
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TemplateClass<int> c;
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c.f();
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}
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{
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TemplateClass<S> c;
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c.f();
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}
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}
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// It may make sense not to warn on the rest of the tests.
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// It may be a valid use-case to self-assign to tell the compiler that
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// it is ok to vectorize the store.
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void f0(C *s, C *t) {
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s->a = s->a;
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t->a = s->a;
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}
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void f1(C &s, C &t) {
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s.a = s.a;
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t.a = s.a;
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}
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struct T {
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C *s;
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};
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void f2(T *t, T *t2) {
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t->s->a = t->s->a;
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t2->s->a = t->s->a;
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}
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void f3(T &t, T &t2) {
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t.s->a = t.s->a;
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t2.s->a = t.s->a;
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}
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