1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 %s
2 
3 // Need std::initializer_list
4 namespace std {
5   typedef decltype(sizeof(int)) size_t;
6 
7   // libc++'s implementation
8   template <class _E>
9   class initializer_list
10   {
11     const _E* __begin_;
12     size_t    __size_;
13 
14     initializer_list(const _E* __b, size_t __s)
15       : __begin_(__b),
16         __size_(__s)
17     {}
18 
19   public:
20     typedef _E        value_type;
21     typedef const _E& reference;
22     typedef const _E& const_reference;
23     typedef size_t    size_type;
24 
25     typedef const _E* iterator;
26     typedef const _E* const_iterator;
27 
28     initializer_list() : __begin_(nullptr), __size_(0) {}
29 
30     size_t    size()  const {return __size_;}
31     const _E* begin() const {return __begin_;}
32     const _E* end()   const {return __begin_ + __size_;}
33   };
34 }
35 
36 
37 // Declaration syntax checks
38 [[]] int before_attr;
39 int [[]] between_attr;
40 const [[]] int between_attr_2 = 0; // expected-error {{an attribute list cannot appear here}}
41 int after_attr [[]];
42 int * [[]] ptr_attr;
43 int & [[]] ref_attr = after_attr;
44 int & [[unknown]] ref_attr_2 = after_attr; // expected-warning {{unknown attribute 'unknown' ignored}}
45 int & [[noreturn]] ref_attr_3 = after_attr; // expected-error {{'noreturn' attribute cannot be applied to types}}
46 int && [[]] rref_attr = 0;
47 int array_attr [1] [[]];
48 alignas(8) int aligned_attr;
49 [[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}}
50 [[,,,static, class, namespace,, inline, constexpr, mutable,, bitand, bitor::compl(!.*_ Cx.!U^*R),,,]] int more_garbage_attr; // expected-warning {{unknown attribute 'static' ignored}} \
51 	// expected-warning {{unknown attribute 'class' ignored}} \
52 	// expected-warning {{unknown attribute 'namespace' ignored}} \
53 	// expected-warning {{unknown attribute 'inline' ignored}} \
54 	// expected-warning {{unknown attribute 'constexpr' ignored}} \
55 	// expected-warning {{unknown attribute 'mutable' ignored}} \
56 	// expected-warning {{unknown attribute 'bitand' ignored}} \
57         // expected-warning {{unknown attribute 'compl' ignored}}
58 [[u8"invalid!"]] int invalid_string_attr; // expected-error {{expected ']'}}
59 void fn_attr () [[]];
60 void noexcept_fn_attr () noexcept [[]];
61 struct MemberFnOrder {
62   virtual void f() const volatile && noexcept [[]] final = 0;
63 };
64 struct [[]] struct_attr;
65 class [[]] class_attr {};
66 union [[]] union_attr;
67 
68 // Checks attributes placed at wrong syntactic locations of class specifiers.
69 class [[]] [[]]
70   attr_after_class_name_decl [[]] [[]]; // expected-error {{an attribute list cannot appear here}}
71 
72 class [[]] [[]]
73  attr_after_class_name_definition [[]] [[]] [[]]{}; // expected-error {{an attribute list cannot appear here}}
74 
75 class [[]] c {};
76 class c [[]] [[]] x;
77 class c [[]] [[]] y [[]] [[]];
78 class c final [(int){0}];
79 
80 class base {};
81 class [[]] [[]] final_class
82   alignas(float) [[]] final // expected-error {{an attribute list cannot appear here}}
83   alignas(float) [[]] [[]] alignas(float): base{}; // expected-error {{an attribute list cannot appear here}}
84 
85 class [[]] [[]] final_class_another
86   [[]] [[]] alignas(16) final // expected-error {{an attribute list cannot appear here}}
87   [[]] [[]] alignas(16) [[]]{}; // expected-error {{an attribute list cannot appear here}}
88 
89 [[]] struct with_init_declarators {} init_declarator;
90 [[]] struct no_init_declarators; // expected-error {{an attribute list cannot appear here}}
91 template<typename> [[]] struct no_init_declarators_template; // expected-error {{an attribute list cannot appear here}}
92 void fn_with_structs() {
93   [[]] struct with_init_declarators {} init_declarator;
94   [[]] struct no_init_declarators; // expected-error {{an attribute list cannot appear here}}
95 }
96 [[]];
97 struct ctordtor {
98   [[]] ctordtor();
99   [[]] ~ctordtor();
100 };
101 [[]] ctordtor::ctordtor() {}
102 [[]] ctordtor::~ctordtor() {}
103 extern "C++" [[]] int extern_attr;
104 template <typename T> [[]] void template_attr ();
105 [[]] [[]] int [[]] [[]] multi_attr [[]] [[]];
106 
107 int comma_attr [[,]];
108 int scope_attr [[foo::]]; // expected-error {{expected identifier}}
109 int (paren_attr) [[]]; // expected-error {{an attribute list cannot appear here}}
110 unsigned [[]] int attr_in_decl_spec; // expected-error {{an attribute list cannot appear here}}
111 unsigned [[]] int [[]] const double_decl_spec = 0; // expected-error 2{{an attribute list cannot appear here}}
112 class foo {
113   void const_after_attr () [[]] const; // expected-error {{expected ';'}}
114 };
115 extern "C++" [[]] { } // expected-error {{an attribute list cannot appear here}}
116 [[]] template <typename T> void before_template_attr (); // expected-error {{an attribute list cannot appear here}}
117 [[]] namespace ns { int i; } // expected-error {{an attribute list cannot appear here}} expected-note {{declared here}}
118 [[]] static_assert(true, ""); //expected-error {{an attribute list cannot appear here}}
119 [[]] asm(""); // expected-error {{an attribute list cannot appear here}}
120 
121 [[]] using ns::i; // expected-error {{an attribute list cannot appear here}}
122 [[unknown]] using namespace ns; // expected-warning {{unknown attribute 'unknown' ignored}}
123 [[noreturn]] using namespace ns; // expected-error {{'noreturn' attribute only applies to functions and methods}}
124 
125 [[]] using T = int; // expected-error {{an attribute list cannot appear here}}
126 using T [[]] = int; // ok
127 template<typename T> using U [[]] = T;
128 using ns::i [[]]; // expected-error {{an attribute list cannot appear here}}
129 using [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
130 using T [[unknown]] = int; // expected-warning {{unknown attribute 'unknown' ignored}}
131 using T [[noreturn]] = int; // expected-error {{'noreturn' attribute only applies to functions and methods}}
132 using V = int; // expected-note {{previous}}
133 using V [[gnu::vector_size(16)]] = int; // expected-error {{redefinition with different types}}
134 
135 auto trailing() -> [[]] const int; // expected-error {{an attribute list cannot appear here}}
136 auto trailing() -> const [[]] int; // expected-error {{an attribute list cannot appear here}}
137 auto trailing() -> const int [[]];
138 auto trailing_2() -> struct struct_attr [[]];
139 
140 namespace N {
141   struct S {};
142 };
143 template<typename> struct Template {};
144 
145 // FIXME: Improve this diagnostic
146 struct [[]] N::S s; // expected-error {{an attribute list cannot appear here}}
147 struct [[]] Template<int> t; // expected-error {{an attribute list cannot appear here}}
148 struct [[]] ::template Template<int> u; // expected-error {{an attribute list cannot appear here}}
149 template struct [[]] Template<char>; // expected-error {{an attribute list cannot appear here}}
150 template <> struct [[]] Template<void>;
151 
152 enum [[]] E1 {};
153 enum [[]] E2; // expected-error {{forbids forward references}}
154 enum [[]] E1;
155 enum [[]] E3 : int;
156 enum [[]] {
157   k_123 [[]] = 123 // expected-error {{an attribute list cannot appear here}}
158 };
159 enum [[]] E1 e; // expected-error {{an attribute list cannot appear here}}
160 enum [[]] class E4 { }; // expected-error {{an attribute list cannot appear here}}
161 enum struct [[]] E5;
162 
163 struct S {
164   friend int f [[]] (); // expected-FIXME{{an attribute list cannot appear here}}
165   friend int f1 [[noreturn]] (); //expected-error{{an attribute list cannot appear here}}
166   friend int f2 [[]] [[noreturn]] () {}
167   [[]] friend int g(); // expected-error{{an attribute list cannot appear here}}
168   [[]] friend int h() {
169   }
170   [[]] friend int f3(), f4(), f5(); // expected-error{{an attribute list cannot appear here}}
171   friend int f6 [[noreturn]] (), f7 [[noreturn]] (), f8 [[noreturn]] (); // expected-error3 {{an attribute list cannot appear here}}
172   friend class [[]] C; // expected-error{{an attribute list cannot appear here}}
173   [[]] friend class D; // expected-error{{an attribute list cannot appear here}}
174   [[]] friend int; // expected-error{{an attribute list cannot appear here}}
175 };
176 template<typename T> void tmpl(T) {}
177 template void tmpl [[]] (int); // expected-FIXME {{an attribute list cannot appear here}}
178 template [[]] void tmpl(char); // expected-error {{an attribute list cannot appear here}}
179 template void [[]] tmpl(short);
180 
181 // Argument tests
182 alignas int aligned_no_params; // expected-error {{expected '('}}
183 alignas(i) int aligned_nonconst; // expected-error {{'aligned' attribute requires integer constant}} expected-note {{read of non-const variable 'i'}}
184 
185 // Statement tests
186 void foo () {
187   [[]] ;
188   [[]] { }
189   [[]] if (0) { }
190   [[]] for (;;);
191   [[]] do {
192     [[]] continue;
193   } while (0);
194   [[]] while (0);
195 
196   [[]] switch (i) {
197     [[]] case 0:
198     [[]] default:
199       [[]] break;
200   }
201 
202   [[]] goto there;
203   [[]] there:
204 
205   [[]] try {
206   } [[]] catch (...) { // expected-error {{an attribute list cannot appear here}}
207   }
208   struct S { int arr[2]; } s;
209   (void)s.arr[ [] { return 0; }() ]; // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
210   int n = __builtin_offsetof(S, arr[ [] { return 0; }() ]); // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
211 
212   void bar [[noreturn]] ([[]] int i, [[]] int j);
213   using FuncType = void ([[]] int);
214   void baz([[]]...); // expected-error {{expected parameter declarator}}
215 
216   [[]] return;
217 }
218 
219 template<typename...Ts> void variadic() {
220   void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
221 }
222 
223 // Expression tests
224 void bar () {
225   // FIXME: GCC accepts [[gnu::noreturn]] on a lambda, even though it appertains
226   // to the operator()'s type, and GCC does not otherwise accept attributes
227   // applied to types. Use that to test this.
228   [] () [[gnu::noreturn]] { return; } (); // expected-warning {{attribute 'noreturn' ignored}} FIXME-error {{should not return}}
229   [] () [[gnu::noreturn]] { throw; } (); // expected-warning {{attribute 'noreturn' ignored}}
230   new int[42][[]][5][[]]{};
231 }
232 
233 // Condition tests
234 void baz () {
235   if ([[unknown]] bool b = true) { // expected-warning {{unknown attribute 'unknown' ignored}}
236     switch ([[unknown]] int n { 42 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
237     default:
238       for ([[unknown]] int n = 0; [[unknown]] char b = n < 5; ++b) { // expected-warning 2{{unknown attribute 'unknown' ignored}}
239       }
240     }
241   }
242   int x;
243   // An attribute can be applied to an expression-statement, such as the first
244   // statement in a for. But it can't be applied to a condition which is an
245   // expression.
246   for ([[]] x = 0; ; ) {} // expected-error {{an attribute list cannot appear here}}
247   for (; [[]] x < 5; ) {} // expected-error {{an attribute list cannot appear here}}
248   while ([[]] bool k { false }) {
249   }
250   while ([[]] true) { // expected-error {{an attribute list cannot appear here}}
251   }
252   do {
253   } while ([[]] false); // expected-error {{an attribute list cannot appear here}}
254 
255   for ([[unknown]] int n : { 1, 2, 3 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
256   }
257 }
258 
259 enum class __attribute__((visibility("hidden"))) SecretKeepers {
260   one, /* rest are deprecated */ two, three
261 };
262 enum class [[]] EvenMoreSecrets {};
263 
264 namespace arguments {
265   void f[[gnu::format(printf, 1, 2)]](const char*, ...);
266   void g() [[unknown::foo(arguments of attributes from unknown namespace other than 'gnu' namespace are ignored... blah...)]]; // expected-warning {{unknown attribute 'foo' ignored}}
267 }
268 
269 // Forbid attributes on decl specifiers.
270 unsigned [[gnu::used]] static int [[gnu::unused]] v1; // expected-error {{'unused' attribute cannot be applied to types}} \
271            expected-error {{an attribute list cannot appear here}}
272 typedef [[gnu::used]] unsigned long [[gnu::unused]] v2; // expected-error {{'unused' attribute cannot be applied to types}} \
273           expected-error {{an attribute list cannot appear here}}
274 int [[carries_dependency]] foo(int [[carries_dependency]] x); // expected-error 2{{'carries_dependency' attribute cannot be applied to types}}
275 
276 // Forbid [[gnu::...]] attributes on declarator chunks.
277 int *[[gnu::unused]] v3; // expected-warning {{attribute 'unused' ignored}}
278 int v4[2][[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
279 int v5()[[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
280 
281 [[attribute_declaration]]; // expected-warning {{unknown attribute 'attribute_declaration' ignored}}
282 [[noreturn]]; // expected-error {{'noreturn' attribute only applies to functions and methods}}
283 [[carries_dependency]]; // expected-error {{'carries_dependency' attribute only applies to functions, methods, and parameters}}
284