forked from OSchip/llvm-project
118 lines
2.6 KiB
C++
118 lines
2.6 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -Wself-assign-field -verify %s
|
|
|
|
struct C {
|
|
int a;
|
|
int b;
|
|
|
|
void f() {
|
|
a = a; // expected-warning {{assigning field to itself}}
|
|
b = b; // expected-warning {{assigning field to itself}}
|
|
a = b;
|
|
|
|
this->a = a; // expected-warning {{assigning field to itself}}
|
|
this->b = b; // expected-warning {{assigning field to itself}}
|
|
a = this->a; // expected-warning {{assigning field to itself}}
|
|
b = this->b; // expected-warning {{assigning field to itself}}
|
|
this->a = this->a; // expected-warning {{assigning field to itself}}
|
|
this->b = this->b; // expected-warning {{assigning field to itself}}
|
|
|
|
a = b;
|
|
a = this->b;
|
|
this->a = b;
|
|
this->a = this->b;
|
|
|
|
a *= a;
|
|
a /= a;
|
|
a %= a;
|
|
a += a;
|
|
a -= a;
|
|
a <<= a;
|
|
a >>= a;
|
|
a &= a;
|
|
a |= a;
|
|
a ^= a;
|
|
}
|
|
|
|
void false_positives() {
|
|
#define OP =
|
|
#define LHS a
|
|
#define RHS a
|
|
// These shouldn't warn due to the use of the preprocessor.
|
|
a OP a;
|
|
LHS = a;
|
|
a = RHS;
|
|
LHS OP RHS;
|
|
#undef OP
|
|
#undef LHS
|
|
#undef RHS
|
|
|
|
// A way to silence the warning.
|
|
a = (int &)a;
|
|
}
|
|
|
|
// Do not diagnose self-assigment in an unevaluated context
|
|
void false_positives_unevaluated_ctx() noexcept(noexcept(a = a)) // expected-warning {{expression with side effects has no effect in an unevaluated context}}
|
|
{
|
|
decltype(a = a) b = a; // expected-warning {{expression with side effects has no effect in an unevaluated context}}
|
|
static_assert(noexcept(a = a), ""); // expected-warning {{expression with side effects has no effect in an unevaluated context}}
|
|
static_assert(sizeof(a = a), ""); // expected-warning {{expression with side effects has no effect in an unevaluated context}}
|
|
}
|
|
|
|
volatile int vol_a;
|
|
void vol_test() {
|
|
// Volatile stores aren't side-effect free.
|
|
vol_a = vol_a;
|
|
volatile int &vol_a_ref = vol_a;
|
|
vol_a_ref = vol_a_ref;
|
|
}
|
|
};
|
|
|
|
// Dummy type.
|
|
struct Dummy {};
|
|
|
|
template <typename T>
|
|
struct TemplateClass {
|
|
T var;
|
|
void f() {
|
|
var = var; // expected-warning {{assigning field to itself}}
|
|
}
|
|
};
|
|
void instantiate() {
|
|
{
|
|
TemplateClass<int> c;
|
|
c.f();
|
|
}
|
|
{
|
|
TemplateClass<Dummy> c;
|
|
c.f();
|
|
}
|
|
}
|
|
|
|
// It may make sense not to warn on the rest of the tests.
|
|
// It may be a valid use-case to self-assign to tell the compiler that
|
|
// it is ok to vectorize the store.
|
|
|
|
void f0(C *s, C *t) {
|
|
s->a = s->a;
|
|
t->a = s->a;
|
|
}
|
|
|
|
void f1(C &s, C &t) {
|
|
s.a = s.a;
|
|
t.a = s.a;
|
|
}
|
|
|
|
struct T {
|
|
C *s;
|
|
};
|
|
|
|
void f2(T *t, T *t2) {
|
|
t->s->a = t->s->a;
|
|
t2->s->a = t->s->a;
|
|
}
|
|
|
|
void f3(T &t, T &t2) {
|
|
t.s->a = t.s->a;
|
|
t2.s->a = t.s->a;
|
|
}
|