forked from OSchip/llvm-project
313 lines
9.8 KiB
C++
313 lines
9.8 KiB
C++
// RUN: %clang_cc1 -std=c++98 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors \
|
|
// RUN: -Wno-variadic-macros -Wno-c11-extensions
|
|
// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
|
|
// RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
|
|
// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
|
|
// RUN: %clang_cc1 -std=c++2a -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
|
|
|
|
#if __cplusplus < 201103L
|
|
#define static_assert(...) _Static_assert(__VA_ARGS__)
|
|
#endif
|
|
|
|
namespace dr2026 { // dr2026: 11
|
|
template<int> struct X {};
|
|
|
|
const int a = a + 1; // expected-warning {{uninitialized}} expected-note {{here}} expected-note 0-1{{outside its lifetime}}
|
|
X<a> xa; // expected-error {{constant expression}} expected-note {{initializer of 'a'}}
|
|
|
|
#if __cplusplus >= 201103L
|
|
constexpr int b = b; // expected-error {{constant expression}} expected-note {{outside its lifetime}}
|
|
[[clang::require_constant_initialization]] int c = c; // expected-error {{constant initializer}} expected-note {{attribute}}
|
|
#if __cplusplus == 201103L
|
|
// expected-note@-2 {{read of non-const variable}} expected-note@-2 {{declared here}}
|
|
#else
|
|
// expected-note@-4 {{outside its lifetime}}
|
|
#endif
|
|
#endif
|
|
|
|
#if __cplusplus > 201703L
|
|
constinit int d = d; // expected-error {{constant initializer}} expected-note {{outside its lifetime}} expected-note {{'constinit'}}
|
|
#endif
|
|
|
|
void f() {
|
|
static const int e = e + 1; // expected-warning {{suspicious}} expected-note {{here}} expected-note 0-1{{outside its lifetime}}
|
|
X<e> xe; // expected-error {{constant expression}} expected-note {{initializer of 'e'}}
|
|
|
|
#if __cplusplus >= 201103L
|
|
static constexpr int f = f; // expected-error {{constant expression}} expected-note {{outside its lifetime}}
|
|
[[clang::require_constant_initialization]] static int g = g; // expected-error {{constant initializer}} expected-note {{attribute}}
|
|
#if __cplusplus == 201103L
|
|
// expected-note@-2 {{read of non-const variable}} expected-note@-2 {{declared here}}
|
|
#else
|
|
// expected-note@-4 {{outside its lifetime}}
|
|
#endif
|
|
#endif
|
|
|
|
#if __cplusplus > 201703L
|
|
static constinit int h = h; // expected-error {{constant initializer}} expected-note {{outside its lifetime}} expected-note {{'constinit'}}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
namespace dr2076 { // dr2076: 13
|
|
#if __cplusplus >= 201103L
|
|
namespace std_example {
|
|
struct A { A(int); };
|
|
struct B { B(A); };
|
|
B b{{0}};
|
|
|
|
struct Params { int a; int b; };
|
|
struct Foo {
|
|
Foo(Params);
|
|
};
|
|
Foo foo{{1, 2}};
|
|
}
|
|
|
|
struct string_view {
|
|
string_view(int); // not an aggregate
|
|
};
|
|
struct string {
|
|
string(int); // not an aggregate
|
|
operator string_view() const;
|
|
};
|
|
|
|
void foo(const string &); // expected-note {{cannot convert initializer list}}
|
|
void bar(string_view); // expected-note 2{{cannot convert initializer list}}
|
|
|
|
void func(const string &arg) {
|
|
// An argument in one set of braces is subject to user-defined conversions;
|
|
// an argument in two sets of braces is not, but an identity conversion is
|
|
// still OK.
|
|
foo(arg);
|
|
foo({arg});
|
|
foo({{arg}});
|
|
foo({{{arg}}}); // expected-error {{no matching function}}
|
|
bar(arg);
|
|
bar({arg});
|
|
bar({{arg}}); // expected-error {{no matching function}}
|
|
bar({{{arg}}}); // expected-error {{no matching function}}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
namespace dr2082 { // dr2082: 11
|
|
void test1(int x, int = sizeof(x)); // ok
|
|
#if __cplusplus >= 201103L
|
|
void test2(int x, int = decltype(x){}); // ok
|
|
#endif
|
|
}
|
|
|
|
namespace dr2083 { // dr2083: partial
|
|
#if __cplusplus >= 201103L
|
|
void non_const_mem_ptr() {
|
|
struct A {
|
|
int x;
|
|
int y;
|
|
};
|
|
constexpr A a = {1, 2};
|
|
struct B {
|
|
int A::*p;
|
|
constexpr int g() const {
|
|
// OK, not an odr-use of 'a'.
|
|
return a.*p;
|
|
};
|
|
};
|
|
static_assert(B{&A::x}.g() == 1, "");
|
|
static_assert(B{&A::y}.g() == 2, "");
|
|
}
|
|
#endif
|
|
|
|
const int a = 1;
|
|
int b;
|
|
// Note, references only get special odr-use / constant initializxer
|
|
// treatment in C++11 onwards. We continue to apply that even after DR2083.
|
|
void ref_to_non_const() {
|
|
int c;
|
|
const int &ra = a; // expected-note 0-1{{here}}
|
|
int &rb = b; // expected-note 0-1{{here}}
|
|
int &rc = c; // expected-note {{here}}
|
|
struct A {
|
|
int f() {
|
|
int a = ra;
|
|
int b = rb;
|
|
#if __cplusplus < 201103L
|
|
// expected-error@-3 {{in enclosing function}}
|
|
// expected-error@-3 {{in enclosing function}}
|
|
#endif
|
|
int c = rc; // expected-error {{in enclosing function}}
|
|
return a + b + c;
|
|
}
|
|
};
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
struct NoMut1 { int a, b; };
|
|
struct NoMut2 { NoMut1 m; };
|
|
struct NoMut3 : NoMut1 {
|
|
constexpr NoMut3(int a, int b) : NoMut1{a, b} {}
|
|
};
|
|
struct Mut1 {
|
|
int a;
|
|
mutable int b;
|
|
};
|
|
struct Mut2 { Mut1 m; };
|
|
struct Mut3 : Mut1 {
|
|
constexpr Mut3(int a, int b) : Mut1{a, b} {}
|
|
};
|
|
void mutable_subobjects() {
|
|
constexpr NoMut1 nm1 = {1, 2};
|
|
constexpr NoMut2 nm2 = {1, 2};
|
|
constexpr NoMut3 nm3 = {1, 2};
|
|
constexpr Mut1 m1 = {1, 2}; // expected-note {{declared here}}
|
|
constexpr Mut2 m2 = {1, 2}; // expected-note {{declared here}}
|
|
constexpr Mut3 m3 = {1, 2}; // expected-note {{declared here}}
|
|
struct A {
|
|
void f() {
|
|
static_assert(nm1.a == 1, "");
|
|
static_assert(nm2.m.a == 1, "");
|
|
static_assert(nm3.a == 1, "");
|
|
// Can't even access a non-mutable member of a variable containing mutable fields.
|
|
static_assert(m1.a == 1, ""); // expected-error {{enclosing function}}
|
|
static_assert(m2.m.a == 1, ""); // expected-error {{enclosing function}}
|
|
static_assert(m3.a == 1, ""); // expected-error {{enclosing function}}
|
|
}
|
|
};
|
|
}
|
|
#endif
|
|
|
|
void ellipsis() {
|
|
void ellipsis(...);
|
|
struct A {};
|
|
const int n = 0;
|
|
#if __cplusplus >= 201103L
|
|
constexpr
|
|
#endif
|
|
A a = {}; // expected-note {{here}}
|
|
struct B {
|
|
void f() {
|
|
ellipsis(n);
|
|
// Even though this is technically modelled as an lvalue-to-rvalue
|
|
// conversion, it calls a constructor and binds 'a' to a reference, so
|
|
// it results in an odr-use.
|
|
ellipsis(a); // expected-error {{enclosing function}}
|
|
}
|
|
};
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
void volatile_lval() {
|
|
struct A { int n; };
|
|
constexpr A a = {0}; // expected-note {{here}}
|
|
struct B {
|
|
void f() {
|
|
// An lvalue-to-rvalue conversion of a volatile lvalue always results
|
|
// in odr-use.
|
|
int A::*p = &A::n;
|
|
int x = a.*p;
|
|
volatile int A::*q = p;
|
|
int y = a.*q; // expected-error {{enclosing function}}
|
|
}
|
|
};
|
|
}
|
|
#endif
|
|
|
|
void discarded_lval() {
|
|
struct A { int x; mutable int y; volatile int z; };
|
|
A a; // expected-note 1+{{here}}
|
|
int &r = a.x; // expected-note {{here}}
|
|
struct B {
|
|
void f() {
|
|
a.x; // expected-warning {{unused}}
|
|
a.*&A::x; // expected-warning {{unused}}
|
|
true ? a.x : a.y; // expected-warning {{unused}}
|
|
(void)a.x;
|
|
a.x, discarded_lval(); // expected-warning {{left operand of comma operator has no effect}}
|
|
#if 1 // FIXME: These errors are all incorrect; the above code is valid.
|
|
// expected-error@-6 {{enclosing function}}
|
|
// expected-error@-6 {{enclosing function}}
|
|
// expected-error@-6 2{{enclosing function}}
|
|
// expected-error@-6 {{enclosing function}}
|
|
// expected-error@-6 {{enclosing function}}
|
|
#endif
|
|
|
|
// 'volatile' qualifier triggers an lvalue-to-rvalue conversion.
|
|
a.z; // expected-error {{enclosing function}}
|
|
#if __cplusplus < 201103L
|
|
// expected-warning@-2 {{assign into a variable}}
|
|
#endif
|
|
|
|
// References always get "loaded" to determine what they reference,
|
|
// even if the result is discarded.
|
|
r; // expected-error {{enclosing function}} expected-warning {{unused}}
|
|
}
|
|
};
|
|
}
|
|
|
|
namespace dr_example_1 {
|
|
extern int globx;
|
|
int main() {
|
|
const int &x = globx;
|
|
struct A {
|
|
#if __cplusplus < 201103L
|
|
// expected-error@+2 {{enclosing function}} expected-note@-3 {{here}}
|
|
#endif
|
|
const int *foo() { return &x; }
|
|
} a;
|
|
return *a.foo();
|
|
}
|
|
}
|
|
|
|
#if __cplusplus >= 201103L
|
|
namespace dr_example_2 {
|
|
struct A {
|
|
int q;
|
|
constexpr A(int q) : q(q) {}
|
|
constexpr A(const A &a) : q(a.q * 2) {} // (note, not called)
|
|
};
|
|
|
|
int main(void) {
|
|
constexpr A a(42);
|
|
constexpr int aq = a.q;
|
|
struct Q {
|
|
int foo() { return a.q; }
|
|
} q;
|
|
return q.foo();
|
|
}
|
|
|
|
// Checking odr-use does not invent an lvalue-to-rvalue conversion (and
|
|
// hence copy construction) on the potential result variable.
|
|
struct B {
|
|
int b = 42;
|
|
constexpr B() {}
|
|
constexpr B(const B&) = delete;
|
|
};
|
|
void f() {
|
|
constexpr B b;
|
|
struct Q {
|
|
constexpr int foo() const { return b.b; }
|
|
};
|
|
static_assert(Q().foo() == 42, "");
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
namespace dr2094 { // dr2094: 5
|
|
struct A { int n; };
|
|
struct B { volatile int n; };
|
|
static_assert(__is_trivially_copyable(volatile int), "");
|
|
static_assert(__is_trivially_copyable(const volatile int), "");
|
|
static_assert(__is_trivially_copyable(const volatile int[]), "");
|
|
static_assert(__is_trivially_copyable(A), "");
|
|
static_assert(__is_trivially_copyable(volatile A), "");
|
|
static_assert(__is_trivially_copyable(const volatile A), "");
|
|
static_assert(__is_trivially_copyable(const volatile A[]), "");
|
|
static_assert(__is_trivially_copyable(B), "");
|
|
|
|
static_assert(__is_trivially_constructible(A, A const&), "");
|
|
static_assert(__is_trivially_constructible(B, B const&), "");
|
|
|
|
static_assert(__is_trivially_assignable(A, const A&), "");
|
|
static_assert(__is_trivially_assignable(B, const B&), "");
|
|
}
|