422 lines
16 KiB
C++
422 lines
16 KiB
C++
// RUN: %clang_cc1 -std=c++98 -triple x86_64-unknown-unknown %s -verify=expected,cxx98 -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,cxx11 -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx14 -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx14 -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx14,since-cxx20 -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++23 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx14,since-cxx20 -fexceptions -fcxx-exceptions -pedantic-errors
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// RUN: %clang_cc1 -std=c++2c -triple x86_64-unknown-unknown %s -verify=expected,since-cxx11,since-cxx14,since-cxx20 -fexceptions -fcxx-exceptions -pedantic-errors
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#if __cplusplus == 199711L
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#define static_assert(...) __extension__ _Static_assert(__VA_ARGS__)
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// cxx98-error@-1 {{variadic macros are a C99 feature}}
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#endif
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namespace dr2007 { // dr2007: 3.4
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template<typename T> struct A { typename T::error e; };
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template<typename T> struct B { };
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B<A<void> > b1;
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B<A<void> > b2 = b1;
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int a = b2[0];
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// cxx98-error@-1 {{type 'B<A<void> >' does not provide a subscript operator}}
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// since-cxx11-error@-2 {{type 'B<A<void>>' does not provide a subscript operator}}
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int b = __builtin_addressof(b2)->foo;
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// cxx98-error@-1 {{no member named 'foo' in 'dr2007::B<dr2007::A<void> >'}}
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// since-cxx11-error@-2 {{no member named 'foo' in 'dr2007::B<dr2007::A<void>>'}}
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}
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// dr2009: na
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namespace dr2026 { // dr2026: 11
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template<int> struct X {};
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const int a = a + 1; // #dr2026-a
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// expected-warning@-1 {{variable 'a' is uninitialized when used within its own initialization}}
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X<a> xa; // #dr2026-xa
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// cxx98-error@-1 {{non-type template argument of type 'int' is not an integral constant expression}}
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// cxx98-note@-2 {{initializer of 'a' is not a constant expression}}
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// cxx98-note@#dr2026-a {{declared here}}
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// since-cxx11-error@#dr2026-xa {{non-type template argument is not a constant expression}}
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// since-cxx11-note@#dr2026-xa {{initializer of 'a' is not a constant expression}}
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// since-cxx11-note@#dr2026-a {{declared here}}
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#if __cplusplus >= 201103L
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constexpr int b = b;
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// since-cxx11-error@-1 {{constexpr variable 'b' must be initialized by a constant expression}}
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// since-cxx11-note@-2 {{read of object outside its lifetime is not allowed in a constant expression}}
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[[clang::require_constant_initialization]] int c = c;
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// since-cxx11-error@-1 {{variable does not have a constant initializer}}
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// since-cxx11-note@-2 {{required by 'require_constant_initialization' attribute here}}
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// cxx11-note@-3 {{read of non-const variable 'c' is not allowed in a constant expression}}
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// cxx11-note@-4 {{declared here}}
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// since-cxx14-note@-5 {{read of object outside its lifetime is not allowed in a constant expression}}
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#endif
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#if __cplusplus >= 202002L
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constinit int d = d;
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// since-cxx20-error@-1 {{variable does not have a constant initializer}}
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// since-cxx20-note@-2 {{required by 'constinit' specifier here}}
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// since-cxx20-note@-3 {{read of object outside its lifetime is not allowed in a constant expression}}
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#endif
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void f() {
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static const int e = e + 1; // #dr2026-e
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// expected-warning@-1 {{static variable 'e' is suspiciously used within its own initialization}}
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X<e> xe; // #dr2026-xe
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// cxx98-error@-1 {{non-type template argument of type 'int' is not an integral constant expression}}
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// cxx98-note@-2 {{initializer of 'e' is not a constant expression}}
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// cxx98-note@#dr2026-e {{declared here}}
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// since-cxx11-error@#dr2026-xe {{non-type template argument is not a constant expression}}
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// since-cxx11-note@#dr2026-xe {{initializer of 'e' is not a constant expression}}
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// since-cxx11-note@#dr2026-e {{declared here}}
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#if __cplusplus >= 201103L
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static constexpr int f = f;
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// since-cxx11-error@-1 {{constexpr variable 'f' must be initialized by a constant expression}}
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// since-cxx11-note@-2 {{read of object outside its lifetime is not allowed in a constant expression}}
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[[clang::require_constant_initialization]] static int g = g;
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// since-cxx11-error@-1 {{variable does not have a constant initializer}}
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// since-cxx11-note@-2 {{required by 'require_constant_initialization' attribute here}}
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// cxx11-note@-3 {{read of non-const variable 'g' is not allowed in a constant expression}}
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// cxx11-note@-4 {{declared here}}
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// since-cxx14-note@-5 {{read of object outside its lifetime is not allowed in a constant expression}}
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#endif
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#if __cplusplus >= 202002L
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static constinit int h = h;
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// since-cxx20-error@-1 {{variable does not have a constant initializer}}
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// since-cxx20-note@-2 {{required by 'constinit' specifier here}}
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// since-cxx20-note@-3 {{read of object outside its lifetime is not allowed in a constant expression}}
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#endif
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}
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}
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namespace dr2049 { // dr2049: 18 drafting
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#if __cplusplus >= 202302L
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template <int* x = {}> struct X {};
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X<> a;
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X<nullptr> b;
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static_assert(__is_same(decltype(a), decltype(b)));
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#endif
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}
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namespace dr2061 { // dr2061: yes
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#if __cplusplus >= 201103L
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namespace A {
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inline namespace b {
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namespace C {
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// 'f' is the example from the DR. 'S' is an example where if we didn't
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// properly handle the two being the same, we would get an incomplete
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// type error during attempted instantiation.
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template<typename T> void f();
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template<typename T> struct S;
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}
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}
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}
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namespace A {
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namespace C {
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template<> void f<int>() { }
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template<> struct S<int> { };
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}
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}
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void use() {
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A::C::f<int>();
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A::C::S<int> s;
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}
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#endif // C++11
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}
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namespace dr2076 { // dr2076: 13
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#if __cplusplus >= 201103L
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namespace std_example {
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struct A { A(int); };
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struct B { B(A); };
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B b{{0}};
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struct Params { int a; int b; };
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struct Foo {
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Foo(Params);
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};
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Foo foo{{1, 2}};
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}
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struct string_view {
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string_view(int); // not an aggregate
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};
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struct string {
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string(int); // not an aggregate
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operator string_view() const;
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};
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void foo(const string &); // #dr2076-foo
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void bar(string_view); // #dr2076-bar
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void func(const string &arg) {
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// An argument in one set of braces is subject to user-defined conversions;
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// an argument in two sets of braces is not, but an identity conversion is
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// still OK.
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foo(arg);
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foo({arg});
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foo({{arg}});
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foo({{{arg}}});
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// since-cxx11-error@-1 {{no matching function}}
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// since-cxx11-note@#dr2076-foo {{cannot convert initializer list}}
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bar(arg);
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bar({arg});
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bar({{arg}});
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// since-cxx11-error@-1 {{no matching function}}
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// since-cxx11-note@#dr2076-bar {{cannot convert initializer list}}
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bar({{{arg}}});
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// since-cxx11-error@-1 {{no matching function}}
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// since-cxx11-note@#dr2076-bar {{cannot convert initializer list}}
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}
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#endif
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}
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namespace dr2082 { // dr2082: 11
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void test1(int x, int = sizeof(x)); // ok
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#if __cplusplus >= 201103L
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void test2(int x, int = decltype(x){}); // ok
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#endif
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}
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namespace dr2083 { // dr2083: partial
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#if __cplusplus >= 201103L
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void non_const_mem_ptr() {
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struct A {
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int x;
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int y;
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};
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constexpr A a = {1, 2};
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struct B {
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int A::*p;
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constexpr int g() const {
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// OK, not an odr-use of 'a'.
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return a.*p;
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};
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};
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static_assert(B{&A::x}.g() == 1, "");
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static_assert(B{&A::y}.g() == 2, "");
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}
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#endif
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const int a = 1;
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int b;
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// Note, references only get special odr-use / constant initializxer
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// treatment in C++11 onwards. We continue to apply that even after DR2083.
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void ref_to_non_const() {
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int c;
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const int &ra = a; // #dr2083-ra
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int &rb = b; // #dr2083-rb
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int &rc = c; // #dr2083-rc
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struct A {
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int f() {
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int a = ra;
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// cxx98-error@-1 {{reference to local variable 'ra' declared in enclosing function 'dr2083::ref_to_non_const'}}
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// cxx98-note@#dr2083-ra {{'ra' declared here}}
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int b = rb;
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// cxx98-error@-1 {{reference to local variable 'rb' declared in enclosing function 'dr2083::ref_to_non_const'}}
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// cxx98-note@#dr2083-rb {{'rb' declared here}}
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int c = rc;
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// expected-error@-1 {{reference to local variable 'rc' declared in enclosing function 'dr2083::ref_to_non_const'}}
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// expected-note@#dr2083-rc {{'rc' declared here}}
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return a + b + c;
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}
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};
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}
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#if __cplusplus >= 201103L
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struct NoMut1 { int a, b; };
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struct NoMut2 { NoMut1 m; };
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struct NoMut3 : NoMut1 {
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constexpr NoMut3(int a, int b) : NoMut1{a, b} {}
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};
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struct Mut1 {
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int a;
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mutable int b;
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};
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struct Mut2 { Mut1 m; };
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struct Mut3 : Mut1 {
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constexpr Mut3(int a, int b) : Mut1{a, b} {}
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};
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void mutable_subobjects() {
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constexpr NoMut1 nm1 = {1, 2};
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constexpr NoMut2 nm2 = {1, 2};
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constexpr NoMut3 nm3 = {1, 2};
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constexpr Mut1 m1 = {1, 2}; // #dr2083-m1
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constexpr Mut2 m2 = {1, 2}; // #dr2083-m2
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constexpr Mut3 m3 = {1, 2}; // #dr2083-m3
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struct A {
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void f() {
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static_assert(nm1.a == 1, "");
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static_assert(nm2.m.a == 1, "");
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static_assert(nm3.a == 1, "");
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// Can't even access a non-mutable member of a variable containing mutable fields.
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static_assert(m1.a == 1, "");
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// since-cxx11-error@-1 {{reference to local variable 'm1' declared in enclosing function 'dr2083::mutable_subobjects'}}
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// since-cxx11-note@#dr2083-m1 {{'m1' declared here}}
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static_assert(m2.m.a == 1, "");
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// since-cxx11-error@-1 {{reference to local variable 'm2' declared in enclosing function 'dr2083::mutable_subobjects'}}
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// since-cxx11-note@#dr2083-m2 {{'m2' declared here}}
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static_assert(m3.a == 1, "");
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// since-cxx11-error@-1 {{reference to local variable 'm3' declared in enclosing function 'dr2083::mutable_subobjects'}}
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// since-cxx11-note@#dr2083-m3 {{'m3' declared here}}
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}
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};
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}
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#endif
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void ellipsis() {
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void ellipsis(...);
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struct A {};
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const int n = 0;
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#if __cplusplus >= 201103L
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constexpr
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#endif
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A a = {}; // #dr2083-a
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struct B {
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void f() {
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ellipsis(n);
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// Even though this is technically modelled as an lvalue-to-rvalue
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// conversion, it calls a constructor and binds 'a' to a reference, so
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// it results in an odr-use.
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ellipsis(a);
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// expected-error@-1 {{reference to local variable 'a' declared in enclosing function 'dr2083::ellipsis'}}
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// expected-note@#dr2083-a {{'a' declared here}}
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}
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};
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}
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#if __cplusplus >= 201103L
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void volatile_lval() {
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struct A { int n; };
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constexpr A a = {0}; // #dr2083-a2
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struct B {
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void f() {
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// An lvalue-to-rvalue conversion of a volatile lvalue always results
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// in odr-use.
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int A::*p = &A::n;
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int x = a.*p;
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volatile int A::*q = p;
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int y = a.*q;
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// since-cxx11-error@-1 {{reference to local variable 'a' declared in enclosing function 'dr2083::volatile_lval'}}
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// since-cxx11-note@#dr2083-a2 {{'a' declared here}}
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}
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};
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}
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#endif
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void discarded_lval() {
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struct A { int x; mutable int y; volatile int z; };
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A a; // #dr2083-a-3
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int &r = a.x; // #dr2083-r
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struct B {
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void f() {
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// FIXME: We emit more errors than we should be. They are explictly marked below.
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a.x;
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// expected-warning@-1 {{expression result unused}}
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// expected-error@-2 {{reference to local variable 'a' declared in enclosing function 'dr2083::discarded_lval'}} FIXME
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// expected-note@#dr2083-a-3 {{'a' declared here}}
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a.*&A::x;
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// expected-warning@-1 {{expression result unused}}
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// expected-error@-2 {{reference to local variable 'a' declared in enclosing function 'dr2083::discarded_lval'}} FIXME
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// expected-note@#dr2083-a-3 {{'a' declared here}}
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true ? a.x : a.y; // #dr2083-ternary
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// expected-warning@-1 {{expression result unused}}
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// expected-error@#dr2083-ternary {{reference to local variable 'a' declared in enclosing function 'dr2083::discarded_lval'}} FIXME
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// expected-note@#dr2083-a-3 {{'a' declared here}}
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// expected-error@#dr2083-ternary {{reference to local variable 'a' declared in enclosing function 'dr2083::discarded_lval'}} FIXME
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// expected-note@#dr2083-a-3 {{'a' declared here}}
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(void)a.x;
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// expected-error@-1 {{reference to local variable 'a' declared in enclosing function 'dr2083::discarded_lval'}} FIXME
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// expected-note@#dr2083-a-3 {{'a' declared here}}
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a.x, discarded_lval();
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// expected-warning@-1 {{left operand of comma operator has no effect}}
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// expected-error@-2 {{reference to local variable 'a' declared in enclosing function 'dr2083::discarded_lval'}} FIXME
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// expected-note@#dr2083-a-3 {{'a' declared here}}
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// 'volatile' qualifier triggers an lvalue-to-rvalue conversion.
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a.z;
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// cxx98-warning@-1 {{expression result unused; assign into a variable to force a volatile load}}
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// expected-error@-2 {{reference to local variable 'a' declared in enclosing function 'dr2083::discarded_lval'}}
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// expected-note@#dr2083-a-3 {{'a' declared here}}
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// References always get "loaded" to determine what they reference,
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// even if the result is discarded.
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r;
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// expected-warning@-1 {{expression result unused}}
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// expected-error@-2 {{reference to local variable 'r' declared in enclosing function 'dr2083::discarded_lval'}}
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// expected-note@#dr2083-r {{'r' declared here}}
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}
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};
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}
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namespace dr_example_1 {
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extern int globx;
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int main() {
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const int &x = globx; // #dr2083-x
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struct A {
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const int *foo() { return &x; }
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// cxx98-error@-1 {{reference to local variable 'x' declared in enclosing function 'dr2083::dr_example_1::main'}}
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// cxx98-note@#dr2083-x {{'x' declared here}}
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} a;
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return *a.foo();
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}
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}
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#if __cplusplus >= 201103L
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namespace dr_example_2 {
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struct A {
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int q;
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constexpr A(int q) : q(q) {}
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constexpr A(const A &a) : q(a.q * 2) {} // (note, not called)
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};
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int main(void) {
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constexpr A a(42);
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constexpr int aq = a.q;
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struct Q {
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int foo() { return a.q; }
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} q;
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return q.foo();
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}
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// Checking odr-use does not invent an lvalue-to-rvalue conversion (and
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// hence copy construction) on the potential result variable.
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struct B {
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int b = 42;
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constexpr B() {}
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constexpr B(const B&) = delete;
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};
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void f() {
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constexpr B b;
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struct Q {
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constexpr int foo() const { return b.b; }
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};
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static_assert(Q().foo() == 42, "");
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}
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}
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#endif
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}
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namespace dr2094 { // dr2094: 5
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struct A { int n; };
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struct B { volatile int n; };
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static_assert(__is_trivially_copyable(volatile int), "");
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static_assert(__is_trivially_copyable(const volatile int), "");
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static_assert(__is_trivially_copyable(const volatile int[]), "");
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static_assert(__is_trivially_copyable(A), "");
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static_assert(__is_trivially_copyable(volatile A), "");
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static_assert(__is_trivially_copyable(const volatile A), "");
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static_assert(__is_trivially_copyable(const volatile A[]), "");
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static_assert(__is_trivially_copyable(B), "");
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static_assert(__is_trivially_constructible(A, A const&), "");
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static_assert(__is_trivially_constructible(B, B const&), "");
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static_assert(__is_trivially_assignable(A, const A&), "");
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static_assert(__is_trivially_assignable(B, const B&), "");
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}
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// dr2096: dup 2598
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