1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 -Wc++14-compat %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}}
124 namespace [[]] ns2 {} // expected-warning {{attributes on a namespace declaration are incompatible with C++ standards before C++1z}}
125 
126 using [[]] alignas(4) [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
127 using [[]] alignas(4) [[]] foobar = int; // expected-error {{an attribute list cannot appear here}} expected-error {{'alignas' attribute only applies to}}
128 
129 void bad_attributes_in_do_while() {
130   do {} while (
131       [[ns::i); // expected-error {{expected ']'}} \
132                 // expected-note {{to match this '['}} \
133                 // expected-error {{expected expression}}
134   do {} while (
135       [[a]b ns::i); // expected-error {{expected ']'}} \
136                     // expected-note {{to match this '['}} \
137                     // expected-error {{expected expression}}
138   do {} while (
139       [[ab]ab] ns::i); // expected-error {{an attribute list cannot appear here}}
140   do {} while ( // expected-note {{to match this '('}}
141       alignas(4 ns::i; // expected-note {{to match this '('}}
142 } // expected-error 2{{expected ')'}} expected-error {{expected expression}}
143 
144 [[]] using T = int; // expected-error {{an attribute list cannot appear here}}
145 using T [[]] = int; // ok
146 template<typename T> using U [[]] = T;
147 using ns::i [[]]; // expected-error {{an attribute list cannot appear here}}
148 using [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
149 using T [[unknown]] = int; // expected-warning {{unknown attribute 'unknown' ignored}}
150 using T [[noreturn]] = int; // expected-error {{'noreturn' attribute only applies to functions}}
151 using V = int; // expected-note {{previous}}
152 using V [[gnu::vector_size(16)]] = int; // expected-error {{redefinition with different types}}
153 
154 auto trailing() -> [[]] const int; // expected-error {{an attribute list cannot appear here}}
155 auto trailing() -> const [[]] int; // expected-error {{an attribute list cannot appear here}}
156 auto trailing() -> const int [[]];
157 auto trailing_2() -> struct struct_attr [[]];
158 
159 namespace N {
160   struct S {};
161 };
162 template<typename> struct Template {};
163 
164 // FIXME: Improve this diagnostic
165 struct [[]] N::S s; // expected-error {{an attribute list cannot appear here}}
166 struct [[]] Template<int> t; // expected-error {{an attribute list cannot appear here}}
167 struct [[]] ::template Template<int> u; // expected-error {{an attribute list cannot appear here}}
168 template struct [[]] Template<char>; // expected-error {{an attribute list cannot appear here}}
169 template <> struct [[]] Template<void>;
170 
171 enum [[]] E1 {};
172 enum [[]] E2; // expected-error {{forbids forward references}}
173 enum [[]] E1;
174 enum [[]] E3 : int;
175 enum [[]] {
176   k_123 [[]] = 123 // expected-warning {{attributes on an enumerator declaration are incompatible with C++ standards before C++1z}}
177 };
178 enum [[]] E1 e; // expected-error {{an attribute list cannot appear here}}
179 enum [[]] class E4 { }; // expected-error {{an attribute list cannot appear here}}
180 enum struct [[]] E5;
181 
182 struct S {
183   friend int f [[]] (); // expected-FIXME{{an attribute list cannot appear here}}
184   friend int f1 [[noreturn]] (); //expected-error{{an attribute list cannot appear here}}
185   friend int f2 [[]] [[noreturn]] () {}
186   [[]] friend int g(); // expected-error{{an attribute list cannot appear here}}
187   [[]] friend int h() {
188   }
189   [[]] friend int f3(), f4(), f5(); // expected-error{{an attribute list cannot appear here}}
190   friend int f6 [[noreturn]] (), f7 [[noreturn]] (), f8 [[noreturn]] (); // expected-error3 {{an attribute list cannot appear here}}
191   friend class [[]] C; // expected-error{{an attribute list cannot appear here}}
192   [[]] friend class D; // expected-error{{an attribute list cannot appear here}}
193   [[]] friend int; // expected-error{{an attribute list cannot appear here}}
194 };
195 template<typename T> void tmpl(T) {}
196 template void tmpl [[]] (int); // expected-FIXME {{an attribute list cannot appear here}}
197 template [[]] void tmpl(char); // expected-error {{an attribute list cannot appear here}}
198 template void [[]] tmpl(short);
199 
200 // Argument tests
201 alignas int aligned_no_params; // expected-error {{expected '('}}
202 alignas(i) int aligned_nonconst; // expected-error {{'aligned' attribute requires integer constant}} expected-note {{read of non-const variable 'i'}}
203 
204 // Statement tests
205 void foo () {
206   [[]] ;
207   [[]] { }
208   [[]] if (0) { }
209   [[]] for (;;);
210   [[]] do {
211     [[]] continue;
212   } while (0);
213   [[]] while (0);
214 
215   [[]] switch (i) {
216     [[]] case 0:
217     [[]] default:
218       [[]] break;
219   }
220 
221   [[]] goto there;
222   [[]] there:
223 
224   [[]] try {
225   } [[]] catch (...) { // expected-error {{an attribute list cannot appear here}}
226   }
227   struct S { int arr[2]; } s;
228   (void)s.arr[ [] { return 0; }() ]; // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
229   int n = __builtin_offsetof(S, arr[ [] { return 0; }() ]); // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
230 
231   void bar [[noreturn]] ([[]] int i, [[]] int j);
232   using FuncType = void ([[]] int);
233   void baz([[]]...); // expected-error {{expected parameter declarator}}
234 
235   [[]] return;
236 }
237 
238 template<typename...Ts> void variadic() {
239   void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
240 }
241 
242 // Expression tests
243 void bar () {
244   // FIXME: GCC accepts [[gnu::noreturn]] on a lambda, even though it appertains
245   // to the operator()'s type, and GCC does not otherwise accept attributes
246   // applied to types. Use that to test this.
247   [] () [[gnu::noreturn]] { return; } (); // expected-warning {{attribute 'noreturn' ignored}} FIXME-error {{should not return}}
248   [] () [[gnu::noreturn]] { throw; } (); // expected-warning {{attribute 'noreturn' ignored}}
249   new int[42][[]][5][[]]{};
250 }
251 
252 // Condition tests
253 void baz () {
254   if ([[unknown]] bool b = true) { // expected-warning {{unknown attribute 'unknown' ignored}}
255     switch ([[unknown]] int n { 42 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
256     default:
257       for ([[unknown]] int n = 0; [[unknown]] char b = n < 5; ++b) { // expected-warning 2{{unknown attribute 'unknown' ignored}}
258       }
259     }
260   }
261   int x;
262   // An attribute can be applied to an expression-statement, such as the first
263   // statement in a for. But it can't be applied to a condition which is an
264   // expression.
265   for ([[]] x = 0; ; ) {} // expected-error {{an attribute list cannot appear here}}
266   for (; [[]] x < 5; ) {} // expected-error {{an attribute list cannot appear here}}
267   while ([[]] bool k { false }) {
268   }
269   while ([[]] true) { // expected-error {{an attribute list cannot appear here}}
270   }
271   do {
272   } while ([[]] false); // expected-error {{an attribute list cannot appear here}}
273 
274   for ([[unknown]] int n : { 1, 2, 3 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
275   }
276 }
277 
278 enum class __attribute__((visibility("hidden"))) SecretKeepers {
279   one, /* rest are deprecated */ two, three
280 };
281 enum class [[]] EvenMoreSecrets {};
282 
283 namespace arguments {
284   void f[[gnu::format(printf, 1, 2)]](const char*, ...);
285   void g() [[unknown::foo(ignore arguments for unknown attributes, even with symbols!)]]; // expected-warning {{unknown attribute 'foo' ignored}}
286   [[deprecated("with argument")]] int i;
287 }
288 
289 // Forbid attributes on decl specifiers.
290 unsigned [[gnu::used]] static int [[gnu::unused]] v1; // expected-error {{'unused' attribute cannot be applied to types}} \
291            expected-error {{an attribute list cannot appear here}}
292 typedef [[gnu::used]] unsigned long [[gnu::unused]] v2; // expected-error {{'unused' attribute cannot be applied to types}} \
293           expected-error {{an attribute list cannot appear here}}
294 int [[carries_dependency]] foo(int [[carries_dependency]] x); // expected-error 2{{'carries_dependency' attribute cannot be applied to types}}
295 
296 // Forbid [[gnu::...]] attributes on declarator chunks.
297 int *[[gnu::unused]] v3; // expected-warning {{attribute 'unused' ignored}}
298 int v4[2][[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
299 int v5()[[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
300 
301 [[attribute_declaration]]; // expected-warning {{unknown attribute 'attribute_declaration' ignored}}
302 [[noreturn]]; // expected-error {{'noreturn' attribute only applies to functions}}
303 [[carries_dependency]]; // expected-error {{'carries_dependency' attribute only applies to functions, methods, and parameters}}
304 
305 class A {
306   A([[gnu::unused]] int a);
307 };
308 A::A([[gnu::unused]] int a) {}
309 
310 namespace GccConst {
311   // GCC's tokenizer treats const and __const as the same token.
312   [[gnu::const]] int *f1();
313   [[gnu::__const]] int *f2();
314   [[gnu::__const__]] int *f3();
315   void f(const int *);
316   void g() { f(f1()); f(f2()); }
317   void h() { f(f3()); }
318 }
319 
320 namespace GccASan {
321   __attribute__((no_address_safety_analysis)) void f1();
322   __attribute__((no_sanitize_address)) void f2();
323   [[gnu::no_address_safety_analysis]] void f3();
324   [[gnu::no_sanitize_address]] void f4();
325 }
326 
327 namespace {
328   [[deprecated]] void bar();
329   [[deprecated("hello")]] void baz();
330   [[deprecated()]] void foo(); // expected-error {{parentheses must be omitted if 'deprecated' attribute's argument list is empty}}
331   [[gnu::deprecated()]] void quux();
332 }
333