// RUN: %clang_cc1 -fcxx-exceptions -fdeclspec -fexceptions -fsyntax-only -verify -std=c++11 -Wc++14-compat -Wc++14-extensions -Wc++17-extensions %s
// Need std::initializer_list
namespace std {
typedef decltype(sizeof(int)) size_t;
// libc++'s implementation
template <class _E>
class initializer_list
{
const _E* __begin_;
size_t __size_;
initializer_list(const _E* __b, size_t __s)
: __begin_(__b),
__size_(__s)
{}
public:
typedef _E value_type;
typedef const _E& reference;
typedef const _E& const_reference;
typedef size_t size_type;
typedef const _E* iterator;
typedef const _E* const_iterator;
initializer_list() : __begin_(nullptr), __size_(0) {}
size_t size() const {return __size_;}
const _E* begin() const {return __begin_;}
const _E* end() const {return __begin_ + __size_;}
};
}
// Declaration syntax checks
[[]] int before_attr;
int [[]] between_attr;
const [[]] int between_attr_2 = 0; // expected-error {{an attribute list cannot appear here}}
int after_attr [[]];
int * [[]] ptr_attr;
int & [[]] ref_attr = after_attr;
int & [[unknown]] ref_attr_2 = after_attr; // expected-warning {{unknown attribute 'unknown' ignored}}
int & [[noreturn]] ref_attr_3 = after_attr; // expected-error {{'noreturn' attribute cannot be applied to types}}
int && [[]] rref_attr = 0;
int array_attr [1] [[]];
alignas(8) int aligned_attr;
[[test::valid(for 42 [very] **** '+' symbols went on a trip and had a "good"_time; the end.)]] int garbage_attr; // expected-warning {{unknown attribute 'valid' ignored}}
[[,,,static, class, namespace,, inline, constexpr, mutable,, bitand, bitor::compl(!.*_ Cx.!U^*R),,,]] int more_garbage_attr; // expected-warning {{unknown attribute 'static' ignored}} \
// expected-warning {{unknown attribute 'class' ignored}} \
// expected-warning {{unknown attribute 'namespace' ignored}} \
// expected-warning {{unknown attribute 'inline' ignored}} \
// expected-warning {{unknown attribute 'constexpr' ignored}} \
// expected-warning {{unknown attribute 'mutable' ignored}} \
// expected-warning {{unknown attribute 'bitand' ignored}} \
// expected-warning {{unknown attribute 'compl' ignored}}
[[u8"invalid!"]] int invalid_string_attr; // expected-error {{expected ']'}}
void fn_attr () [[]];
void noexcept_fn_attr () noexcept [[]];
struct MemberFnOrder {
virtual void f() const volatile && noexcept [[]] final = 0;
};
struct [[]] struct_attr;
class [[]] class_attr {};
union [[]] union_attr;
enum [[]] E { };
namespace test_misplacement {
[[]] struct struct_attr2; //expected-error{{misplaced attributes}}
[[]] class class_attr2; //expected-error{{misplaced attributes}}
[[]] union union_attr2; //expected-error{{misplaced attributes}}
[[]] enum E2 { }; //expected-error{{misplaced attributes}}
}
// Checks attributes placed at wrong syntactic locations of class specifiers.
class [[]] [[]]
attr_after_class_name_decl [[]] [[]]; // expected-error {{an attribute list cannot appear here}}
class [[]] [[]]
attr_after_class_name_definition [[]] [[]] [[]]{}; // expected-error {{an attribute list cannot appear here}}
class [[]] c {};
class c [[]] [[]] x;
class c [[]] [[]] y [[]] [[]];
class c final [(int){0}];
class base {};
class [[]] [[]] final_class
alignas(float) [[]] final // expected-error {{an attribute list cannot appear here}}
alignas(float) [[]] [[]] alignas(float): base{}; // expected-error {{an attribute list cannot appear here}}
class [[]] [[]] final_class_another
[[]] [[]] alignas(16) final // expected-error {{an attribute list cannot appear here}}
[[]] [[]] alignas(16) [[]]{}; // expected-error {{an attribute list cannot appear here}}
// The diagnostics here don't matter much, this just shouldn't crash:
class C final [[deprecated(l]] {}); //expected-error {{expected string literal as argument of 'deprecated' attribute}} expected-error {{an attribute list cannot appear here}} expected-error {{expected unqualified-id}}
class D final alignas ([l) {}]{}); // expected-error {{expected ',' or ']' in lambda capture list}} expected-error {{an attribute list cannot appear here}}
[[]] struct with_init_declarators {} init_declarator;
[[]] struct no_init_declarators; // expected-error {{misplaced attributes}}
template<typename> [[]] struct no_init_declarators_template; // expected-error {{an attribute list cannot appear here}}
void fn_with_structs() {
[[]] struct with_init_declarators {} init_declarator;
[[]] struct no_init_declarators; // expected-error {{an attribute list cannot appear here}}
}
[[]];
struct ctordtor {
[[]] ctordtor [[]] () [[]];
ctordtor (C) [[]];
[[]] ~ctordtor [[]] () [[]];
};
[[]] ctordtor::ctordtor [[]] () [[]] {}
[[]] ctordtor::ctordtor (C) [[]] try {} catch (...) {}
[[]] ctordtor::~ctordtor [[]] () [[]] {}
extern "C++" [[]] int extern_attr;
template <typename T> [[]] void template_attr ();
[[]] [[]] int [[]] [[]] multi_attr [[]] [[]];
int comma_attr [[,]];
int scope_attr [[foo::]]; // expected-error {{expected identifier}}
int (paren_attr) [[]]; // expected-error {{an attribute list cannot appear here}}
unsigned [[]] int attr_in_decl_spec; // expected-error {{an attribute list cannot appear here}}
unsigned [[]] int [[]] const double_decl_spec = 0; // expected-error 2{{an attribute list cannot appear here}}
class foo {
void const_after_attr () [[]] const; // expected-error {{expected ';'}}
};
extern "C++" [[]] { } // expected-error {{an attribute list cannot appear here}}
[[]] extern "C++" { } // expected-error {{an attribute list cannot appear here}}
[[]] template <typename T> void before_template_attr (); // expected-error {{an attribute list cannot appear here}}
[[]] namespace ns { int i; } // expected-error {{an attribute list cannot appear here}} expected-note {{declared here}}
[[]] static_assert(true, ""); //expected-error {{an attribute list cannot appear here}}
[[]] asm(""); // expected-error {{an attribute list cannot appear here}}
[[]] using ns::i;
[[unknown]] using namespace ns; // expected-warning {{unknown attribute 'unknown' ignored}}
[[noreturn]] using namespace ns; // expected-error {{'noreturn' attribute only applies to functions}}
namespace [[]] ns2 {} // expected-warning {{attributes on a namespace declaration are a C++17 extension}}
using[[]] alignas(4)[[]] ns::i; // expected-error {{an attribute list cannot appear here}} expected-error {{'alignas' attribute only applies to variables, data members and tag types}} expected-warning {{ISO C++}}
using [[]] alignas(4) [[]] foobar = int; // expected-error {{an attribute list cannot appear here}} expected-error {{'alignas' attribute only applies to}}
void bad_attributes_in_do_while() {
do {} while (
[[ns::i); // expected-error {{expected ']'}} \
// expected-note {{to match this '['}} \
// expected-error {{expected expression}}
do {} while (
[[a]b ns::i); // expected-error {{expected ']'}} \
// expected-note {{to match this '['}} \
// expected-error {{expected expression}}
do {} while (
[[ab]ab] ns::i); // expected-error {{an attribute list cannot appear here}}
do {} while ( // expected-note {{to match this '('}}
alignas(4 ns::i; // expected-note {{to match this '('}}
// expected-error@-1 {{expected ';' after do/while}}
} // expected-error 2{{expected ')'}} expected-error {{expected expression}}
[[]] using T = int; // expected-error {{an attribute list cannot appear here}}
using T [[]] = int; // ok
template<typename T> using U [[]] = T;
using ns::i [[]];
using ns::i [[]], ns::i [[]]; // expected-warning {{use of multiple declarators in a single using declaration is a C++17 extension}}
struct using_in_struct_base {
typedef int i, j, k, l;
};
struct using_in_struct : using_in_struct_base {
[[]] using using_in_struct_base::i;
using using_in_struct_base::j [[]];
[[]] using using_in_struct_base::k [[]], using_in_struct_base::l [[]]; // expected-warning {{use of multiple declarators in a single using declaration is a C++17 extension}}
};
using [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
using T [[unknown]] = int; // expected-warning {{unknown attribute 'unknown' ignored}}
using T [[noreturn]] = int; // expected-error {{'noreturn' attribute only applies to functions}}
using V = int; // expected-note {{previous}}
using V [[gnu::vector_size(16)]] = int; // expected-error {{redefinition with different types}}
auto trailing() -> [[]] const int; // expected-error {{an attribute list cannot appear here}}
auto trailing() -> const [[]] int; // expected-error {{an attribute list cannot appear here}}
auto trailing() -> const int [[]];
auto trailing_2() -> struct struct_attr [[]];
namespace N {
struct S {};
};
template<typename> struct Template {};
// FIXME: Improve this diagnostic
struct [[]] N::S s; // expected-error {{an attribute list cannot appear here}}
struct [[]] Template<int> t; // expected-error {{an attribute list cannot appear here}}
struct [[]] ::template Template<int> u; // expected-error {{an attribute list cannot appear here}}
template struct [[]] Template<char>; // expected-error {{an attribute list cannot appear here}}
template struct __attribute__((pure)) Template<std::size_t>; // We still allow GNU-style attributes here
template <> struct [[]] Template<void>;
enum [[]] E1 {};
enum [[]] E2; // expected-error {{forbids forward references}}
enum [[]] E1;
enum [[]] E3 : int;
enum [[]] {
k_123 [[]] = 123 // expected-warning {{attributes on an enumerator declaration are a C++17 extension}}
};
enum [[]] E1 e; // expected-error {{an attribute list cannot appear here}}
enum [[]] class E4 { }; // expected-error {{an attribute list cannot appear here}}
enum struct [[]] E5;
struct S {
friend int f [[]] (); // expected-FIXME{{an attribute list cannot appear here}}
friend int f1 [[noreturn]] (); //expected-error{{an attribute list cannot appear here}}
friend int f2 [[]] [[noreturn]] () {}
[[]] friend int g(); // expected-error{{an attribute list cannot appear here}}
[[]] friend int h() {
}
[[]] friend int f3(), f4(), f5(); // expected-error{{an attribute list cannot appear here}}
friend int f6 [[noreturn]] (), f7 [[noreturn]] (), f8 [[noreturn]] (); // expected-error3 {{an attribute list cannot appear here}}
friend class [[]] C; // expected-error{{an attribute list cannot appear here}}
[[]] friend class D; // expected-error{{an attribute list cannot appear here}}
[[]] friend int; // expected-error{{an attribute list cannot appear here}}
};
template<typename T> void tmpl(T) {}
template void tmpl [[]] (int); // expected-FIXME {{an attribute list cannot appear here}}
template [[]] void tmpl(char); // expected-error {{an attribute list cannot appear here}}
template void [[]] tmpl(short);
// Argument tests
alignas int aligned_no_params; // expected-error {{expected '('}}
alignas(i) int aligned_nonconst; // expected-error {{'aligned' attribute requires integer constant}} expected-note {{read of non-const variable 'i'}}
// Statement tests
void foo () {
[[]] ;
[[]] { }
[[]] if (0) { }
[[]] for (;;);
[[]] do {
[[]] continue;
} while (0);
[[]] while (0);
[[]] switch (i) {
[[]] case 0:
[[]] default:
[[]] break;
}
[[]] goto there;
[[]] there:
[[]] try {
} [[]] catch (...) { // expected-error {{an attribute list cannot appear here}}
}
struct S { int arr[2]; } s;
(void)s.arr[ [] { return 0; }() ]; // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
int n = __builtin_offsetof(S, arr[ [] { return 0; }() ]); // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
void bar [[noreturn]] ([[]] int i, [[]] int j);
using FuncType = void ([[]] int);
void baz([[]]...); // expected-error {{expected parameter declarator}}
[[]] return;
}
template<typename...Ts> void variadic() {
void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
}
template <int... Is> void variadic_nttp() {
void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
void baz [[clang::no_sanitize(Is...)]] (); // expected-error {{expected string literal as argument of 'no_sanitize' attribute}}
void bor [[clang::annotate("A", "V" ...)]] (); // expected-error {{pack expansion does not contain any unexpanded parameter packs}}
void bir [[clang::annotate("B", {1, 2, 3, 4})]] (); // expected-error {{'annotate' attribute requires parameter 1 to be a constant expression}} expected-note {{subexpression not valid in a constant expression}}
void boo [[unknown::foo(Is...)]] (); // expected-warning {{unknown attribute 'foo' ignored}}
void faz [[clang::annotate("C", (Is + ...))]] (); // expected-warning {{pack fold expression is a C++17 extension}}
void far [[clang::annotate("D", Is...)]] ();
void foz [[clang::annotate("E", 1, 2, 3, Is...)]] ();
void fiz [[clang::annotate("F", Is..., 1, 2, 3)]] ();
void fir [[clang::annotate("G", 1, Is..., 2, 3)]] ();
}
// Expression tests
void bar () {
// FIXME: GCC accepts [[gnu::noreturn]] on a lambda, even though it appertains
// to the operator()'s type, and GCC does not otherwise accept attributes
// applied to types. Use that to test this.
[] () [[gnu::noreturn]] { return; } (); // expected-warning {{attribute 'noreturn' ignored}} FIXME-error {{should not return}}
[] () [[gnu::noreturn]] { throw; } (); // expected-warning {{attribute 'noreturn' ignored}}
new int[42][[]][5][[]]{};
}
// Condition tests
void baz () {
if ([[unknown]] bool b = true) { // expected-warning {{unknown attribute 'unknown' ignored}}
switch ([[unknown]] int n { 42 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
default:
for ([[unknown]] int n = 0; [[unknown]] char b = n < 5; ++b) { // expected-warning 2{{unknown attribute 'unknown' ignored}}
}
}
}
int x;
// An attribute can be applied to an expression-statement, such as the first
// statement in a for. But it can't be applied to a condition which is an
// expression.
for ([[]] x = 0; ; ) {} // expected-error {{an attribute list cannot appear here}}
for (; [[]] x < 5; ) {} // expected-error {{an attribute list cannot appear here}}
while ([[]] bool k { false }) {
}
while ([[]] true) { // expected-error {{an attribute list cannot appear here}}
}
do {
} while ([[]] false); // expected-error {{an attribute list cannot appear here}}
for ([[unknown]] int n : { 1, 2, 3 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
}
}
enum class __attribute__((visibility("hidden"))) SecretKeepers {
one, /* rest are deprecated */ two, three
};
enum class [[]] EvenMoreSecrets {};
namespace arguments {
void f[[gnu::format(printf, 1, 2)]](const char*, ...);
void g() [[unknown::foo(ignore arguments for unknown attributes, even with symbols!)]]; // expected-warning {{unknown attribute 'foo' ignored}}
[[deprecated("with argument")]] int i;
// expected-warning@-1 {{use of the 'deprecated' attribute is a C++14 extension}}
}
// Forbid attributes on decl specifiers.
unsigned [[gnu::used]] static int [[gnu::unused]] v1; // expected-error {{'unused' attribute cannot be applied to types}} \
expected-error {{an attribute list cannot appear here}}
typedef [[gnu::used]] unsigned long [[gnu::unused]] v2; // expected-error {{'unused' attribute cannot be applied to types}} \
expected-error {{an attribute list cannot appear here}}
int [[carries_dependency]] foo(int [[carries_dependency]] x); // expected-error 2{{'carries_dependency' attribute cannot be applied to types}}
// Forbid [[gnu::...]] attributes on declarator chunks.
int *[[gnu::unused]] v3; // expected-warning {{attribute 'unused' ignored}}
int v4[2][[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
int v5()[[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
[[attribute_declaration]]; // expected-warning {{unknown attribute 'attribute_declaration' ignored}}
[[noreturn]]; // expected-error {{'noreturn' attribute only applies to functions}}
[[carries_dependency]]; // expected-error {{'carries_dependency' attribute only applies to parameters, Objective-C methods, and functions}}
class A {
A([[gnu::unused]] int a);
};
A::A([[gnu::unused]] int a) {}
namespace GccConst {
// GCC's tokenizer treats const and __const as the same token.
[[gnu::const]] int *f1();
[[gnu::__const]] int *f2();
[[gnu::__const__]] int *f3();
void f(const int *);
void g() { f(f1()); f(f2()); }
void h() { f(f3()); }
}
namespace GccASan {
__attribute__((no_address_safety_analysis)) void f1();
__attribute__((no_sanitize_address)) void f2();
[[gnu::no_address_safety_analysis]] void f3();
[[gnu::no_sanitize_address]] void f4();
}
namespace {
[[deprecated]] void bar();
// expected-warning@-1 {{use of the 'deprecated' attribute is a C++14 extension}}
[[deprecated("hello")]] void baz();
// expected-warning@-1 {{use of the 'deprecated' attribute is a C++14 extension}}
[[deprecated()]] void foo();
// expected-error@-1 {{parentheses must be omitted if 'deprecated' attribute's argument list is empty}}
[[gnu::deprecated()]] void quux();
}
namespace {
[[ // expected-error {{expected ']'}}
#pragma pack(pop)
deprecated
]] void bad();
}
int fallthru(int n) {
switch (n) {
case 0:
n += 5;
[[fallthrough]]; // expected-warning {{use of the 'fallthrough' attribute is a C++17 extension}}
case 1:
n *= 2;
break;
}
return n;
}
template<typename T> struct TemplateStruct {};
class FriendClassesWithAttributes {
// We allow GNU-style attributes here
template <class _Tp, class _Alloc> friend class __attribute__((__type_visibility__("default"))) vector;
template <class _Tp, class _Alloc> friend class __declspec(code_seg("foo,whatever")) vector2;
// But not C++11 ones
template <class _Tp, class _Alloc> friend class[[]] vector3; // expected-error {{an attribute list cannot appear here}}
template <class _Tp, class _Alloc> friend class [[clang::__type_visibility__(("default"))]] vector4; // expected-error {{an attribute list cannot appear here}}
// Also allowed
friend struct __attribute__((__type_visibility__("default"))) TemplateStruct<FriendClassesWithAttributes>;
friend struct __declspec(code_seg("foo,whatever")) TemplateStruct<FriendClassesWithAttributes>;
friend struct[[]] TemplateStruct<FriendClassesWithAttributes>; // expected-error {{an attribute list cannot appear here}}
friend struct [[clang::__type_visibility__("default")]] TemplateStruct<FriendClassesWithAttributes>; // expected-error {{an attribute list cannot appear here}}
};
#define attr_name bitand
#define attr_name_2(x) x
#define attr_name_3(x, y) x##y
[[attr_name, attr_name_2(bitor), attr_name_3(com, pl)]] int macro_attrs; // expected-warning {{unknown attribute 'compl' ignored}} \
expected-warning {{unknown attribute 'bitor' ignored}} \
expected-warning {{unknown attribute 'bitand' ignored}}
// Check that we can parse an attribute in our vendor namespace.
[[clang::annotate("test")]] void annotate1();
[[_Clang::annotate("test")]] void annotate2();
// Note: __clang__ is a predefined macro, which is why _Clang is the
// prefered "protected" vendor namespace. We support __clang__ only for
// people expecting it to behave the same as __gnu__.
[[__clang__::annotate("test")]] void annotate3(); // expected-warning {{'__clang__' is a predefined macro name, not an attribute scope specifier; did you mean '_Clang' instead?}}
// Check ordering: C++11 attributes must appear before GNU attributes.
class Ordering {
void f1(
int ([[]] __attribute__(()) int n)
) {
}
void f2(
int (*)([[]] __attribute__(()) int n)
) {
}
void f3(
int (__attribute__(()) [[]] int n) // expected-error {{an attribute list cannot appear here}}
) {
}
void f4(
int (*)(__attribute__(()) [[]] int n) // expected-error {{an attribute list cannot appear here}}
) {
}
};
namespace P2361 {
[[deprecated(L"abc")]] void a(); // expected-warning{{encoding prefix 'L' on an unevaluated string literal has no effect and is incompatible with c++2c}} \
// expected-warning {{use of the 'deprecated' attribute is a C++14 extension}}
[[nodiscard("\123")]] int b(); // expected-error{{invalid escape sequence '\123' in an unevaluated string literal}}
}
alignas(int) struct AlignAsAttribute {}; // expected-error {{misplaced attributes; expected attributes here}}
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