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1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 -Wc++14-compat -Wc++14-extensions -Wc++1z-extensions %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 
initializer_list(const _E * __b,size_t __s)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 
initializer_list()28     initializer_list() : __begin_(nullptr), __size_(0) {}
29 
size() const30     size_t    size()  const {return __size_;}
begin() const31     const _E* begin() const {return __begin_;}
end() const32     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 // The diagnostics here don't matter much, this just shouldn't crash:
90 class C final [[deprecated(l]] {}); // expected-error {{use of undeclared identifier}} expected-error {{expected ']'}} expected-error {{an attribute list cannot appear here}} expected-error {{expected unqualified-id}}
91 class D final alignas ([l) {}]{}); // expected-error {{expected ',' or ']' in lambda capture list}} expected-error {{an attribute list cannot appear here}}
92 
93 [[]] struct with_init_declarators {} init_declarator;
94 [[]] struct no_init_declarators; // expected-error {{an attribute list cannot appear here}}
95 template<typename> [[]] struct no_init_declarators_template; // expected-error {{an attribute list cannot appear here}}
96 void fn_with_structs() {
97   [[]] struct with_init_declarators {} init_declarator;
98   [[]] struct no_init_declarators; // expected-error {{an attribute list cannot appear here}}
99 }
100 [[]];
101 struct ctordtor {
102   [[]] ctordtor();
103   [[]] ~ctordtor();
104 };
105 [[]] ctordtor::ctordtor() {}
106 [[]] ctordtor::~ctordtor() {}
107 extern "C++" [[]] int extern_attr;
108 template <typename T> [[]] void template_attr ();
109 [[]] [[]] int [[]] [[]] multi_attr [[]] [[]];
110 
111 int comma_attr [[,]];
112 int scope_attr [[foo::]]; // expected-error {{expected identifier}}
113 int (paren_attr) [[]]; // expected-error {{an attribute list cannot appear here}}
114 unsigned [[]] int attr_in_decl_spec; // expected-error {{an attribute list cannot appear here}}
115 unsigned [[]] int [[]] const double_decl_spec = 0; // expected-error 2{{an attribute list cannot appear here}}
116 class foo {
117   void const_after_attr () [[]] const; // expected-error {{expected ';'}}
118 };
119 extern "C++" [[]] { } // expected-error {{an attribute list cannot appear here}}
120 [[]] template <typename T> void before_template_attr (); // expected-error {{an attribute list cannot appear here}}
121 [[]] namespace ns { int i; } // expected-error {{an attribute list cannot appear here}} expected-note {{declared here}}
122 [[]] static_assert(true, ""); //expected-error {{an attribute list cannot appear here}}
123 [[]] asm(""); // expected-error {{an attribute list cannot appear here}}
124 
125 [[]] using ns::i; // expected-error {{an attribute list cannot appear here}}
126 [[unknown]] using namespace ns; // expected-warning {{unknown attribute 'unknown' ignored}}
127 [[noreturn]] using namespace ns; // expected-error {{'noreturn' attribute only applies to functions}}
128 namespace [[]] ns2 {} // expected-warning {{attributes on a namespace declaration are incompatible with C++ standards before C++1z}}
129 
130 using [[]] alignas(4) [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
131 using [[]] alignas(4) [[]] foobar = int; // expected-error {{an attribute list cannot appear here}} expected-error {{'alignas' attribute only applies to}}
132 
133 void bad_attributes_in_do_while() {
134   do {} while (
135       [[ns::i); // expected-error {{expected ']'}} \
136                 // expected-note {{to match this '['}} \
137                 // expected-error {{expected expression}}
138   do {} while (
139       [[a]b ns::i); // expected-error {{expected ']'}} \
140                     // expected-note {{to match this '['}} \
141                     // expected-error {{expected expression}}
142   do {} while (
143       [[ab]ab] ns::i); // expected-error {{an attribute list cannot appear here}}
144   do {} while ( // expected-note {{to match this '('}}
145       alignas(4 ns::i; // expected-note {{to match this '('}}
146 } // expected-error 2{{expected ')'}} expected-error {{expected expression}}
147 
148 [[]] using T = int; // expected-error {{an attribute list cannot appear here}}
149 using T [[]] = int; // ok
150 template<typename T> using U [[]] = T;
151 using ns::i [[]]; // expected-error {{an attribute list cannot appear here}}
152 using [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
153 using T [[unknown]] = int; // expected-warning {{unknown attribute 'unknown' ignored}}
154 using T [[noreturn]] = int; // expected-error {{'noreturn' attribute only applies to functions}}
155 using V = int; // expected-note {{previous}}
156 using V [[gnu::vector_size(16)]] = int; // expected-error {{redefinition with different types}}
157 
158 auto trailing() -> [[]] const int; // expected-error {{an attribute list cannot appear here}}
159 auto trailing() -> const [[]] int; // expected-error {{an attribute list cannot appear here}}
160 auto trailing() -> const int [[]];
161 auto trailing_2() -> struct struct_attr [[]];
162 
163 namespace N {
164   struct S {};
165 };
166 template<typename> struct Template {};
167 
168 // FIXME: Improve this diagnostic
169 struct [[]] N::S s; // expected-error {{an attribute list cannot appear here}}
170 struct [[]] Template<int> t; // expected-error {{an attribute list cannot appear here}}
171 struct [[]] ::template Template<int> u; // expected-error {{an attribute list cannot appear here}}
172 template struct [[]] Template<char>; // expected-error {{an attribute list cannot appear here}}
173 template <> struct [[]] Template<void>;
174 
175 enum [[]] E1 {};
176 enum [[]] E2; // expected-error {{forbids forward references}}
177 enum [[]] E1;
178 enum [[]] E3 : int;
179 enum [[]] {
180   k_123 [[]] = 123 // expected-warning {{attributes on an enumerator declaration are incompatible with C++ standards before C++1z}}
181 };
182 enum [[]] E1 e; // expected-error {{an attribute list cannot appear here}}
183 enum [[]] class E4 { }; // expected-error {{an attribute list cannot appear here}}
184 enum struct [[]] E5;
185 
186 struct S {
187   friend int f [[]] (); // expected-FIXME{{an attribute list cannot appear here}}
188   friend int f1 [[noreturn]] (); //expected-error{{an attribute list cannot appear here}}
189   friend int f2 [[]] [[noreturn]] () {}
190   [[]] friend int g(); // expected-error{{an attribute list cannot appear here}}
191   [[]] friend int h() {
192   }
193   [[]] friend int f3(), f4(), f5(); // expected-error{{an attribute list cannot appear here}}
194   friend int f6 [[noreturn]] (), f7 [[noreturn]] (), f8 [[noreturn]] (); // expected-error3 {{an attribute list cannot appear here}}
195   friend class [[]] C; // expected-error{{an attribute list cannot appear here}}
196   [[]] friend class D; // expected-error{{an attribute list cannot appear here}}
197   [[]] friend int; // expected-error{{an attribute list cannot appear here}}
198 };
199 template<typename T> void tmpl(T) {}
200 template void tmpl [[]] (int); // expected-FIXME {{an attribute list cannot appear here}}
201 template [[]] void tmpl(char); // expected-error {{an attribute list cannot appear here}}
202 template void [[]] tmpl(short);
203 
204 // Argument tests
205 alignas int aligned_no_params; // expected-error {{expected '('}}
206 alignas(i) int aligned_nonconst; // expected-error {{'aligned' attribute requires integer constant}} expected-note {{read of non-const variable 'i'}}
207 
208 // Statement tests
209 void foo () {
210   [[]] ;
211   [[]] { }
212   [[]] if (0) { }
213   [[]] for (;;);
214   [[]] do {
215     [[]] continue;
216   } while (0);
217   [[]] while (0);
218 
219   [[]] switch (i) {
220     [[]] case 0:
221     [[]] default:
222       [[]] break;
223   }
224 
225   [[]] goto there;
226   [[]] there:
227 
228   [[]] try {
229   } [[]] catch (...) { // expected-error {{an attribute list cannot appear here}}
230   }
231   struct S { int arr[2]; } s;
232   (void)s.arr[ [] { return 0; }() ]; // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
233   int n = __builtin_offsetof(S, arr[ [] { return 0; }() ]); // expected-error {{C++11 only allows consecutive left square brackets when introducing an attribute}}
234 
235   void bar [[noreturn]] ([[]] int i, [[]] int j);
236   using FuncType = void ([[]] int);
237   void baz([[]]...); // expected-error {{expected parameter declarator}}
238 
239   [[]] return;
240 }
241 
242 template<typename...Ts> void variadic() {
243   void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
244 }
245 
246 // Expression tests
247 void bar () {
248   // FIXME: GCC accepts [[gnu::noreturn]] on a lambda, even though it appertains
249   // to the operator()'s type, and GCC does not otherwise accept attributes
250   // applied to types. Use that to test this.
251   [] () [[gnu::noreturn]] { return; } (); // expected-warning {{attribute 'noreturn' ignored}} FIXME-error {{should not return}}
252   [] () [[gnu::noreturn]] { throw; } (); // expected-warning {{attribute 'noreturn' ignored}}
253   new int[42][[]][5][[]]{};
254 }
255 
256 // Condition tests
257 void baz () {
258   if ([[unknown]] bool b = true) { // expected-warning {{unknown attribute 'unknown' ignored}}
259     switch ([[unknown]] int n { 42 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
260     default:
261       for ([[unknown]] int n = 0; [[unknown]] char b = n < 5; ++b) { // expected-warning 2{{unknown attribute 'unknown' ignored}}
262       }
263     }
264   }
265   int x;
266   // An attribute can be applied to an expression-statement, such as the first
267   // statement in a for. But it can't be applied to a condition which is an
268   // expression.
269   for ([[]] x = 0; ; ) {} // expected-error {{an attribute list cannot appear here}}
270   for (; [[]] x < 5; ) {} // expected-error {{an attribute list cannot appear here}}
271   while ([[]] bool k { false }) {
272   }
273   while ([[]] true) { // expected-error {{an attribute list cannot appear here}}
274   }
275   do {
276   } while ([[]] false); // expected-error {{an attribute list cannot appear here}}
277 
278   for ([[unknown]] int n : { 1, 2, 3 }) { // expected-warning {{unknown attribute 'unknown' ignored}}
279   }
280 }
281 
282 enum class __attribute__((visibility("hidden"))) SecretKeepers {
283   one, /* rest are deprecated */ two, three
284 };
285 enum class [[]] EvenMoreSecrets {};
286 
287 namespace arguments {
288   void f[[gnu::format(printf, 1, 2)]](const char*, ...);
289   void g() [[unknown::foo(ignore arguments for unknown attributes, even with symbols!)]]; // expected-warning {{unknown attribute 'foo' ignored}}
290   [[deprecated("with argument")]] int i;
291   // expected-warning@-1 {{use of the 'deprecated' attribute is a C++14 extension}}
292 }
293 
294 // Forbid attributes on decl specifiers.
295 unsigned [[gnu::used]] static int [[gnu::unused]] v1; // expected-error {{'unused' attribute cannot be applied to types}} \
296            expected-error {{an attribute list cannot appear here}}
297 typedef [[gnu::used]] unsigned long [[gnu::unused]] v2; // expected-error {{'unused' attribute cannot be applied to types}} \
298           expected-error {{an attribute list cannot appear here}}
299 int [[carries_dependency]] foo(int [[carries_dependency]] x); // expected-error 2{{'carries_dependency' attribute cannot be applied to types}}
300 
301 // Forbid [[gnu::...]] attributes on declarator chunks.
302 int *[[gnu::unused]] v3; // expected-warning {{attribute 'unused' ignored}}
303 int v4[2][[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
304 int v5()[[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
305 
306 [[attribute_declaration]]; // expected-warning {{unknown attribute 'attribute_declaration' ignored}}
307 [[noreturn]]; // expected-error {{'noreturn' attribute only applies to functions}}
308 [[carries_dependency]]; // expected-error {{'carries_dependency' attribute only applies to functions, methods, and parameters}}
309 
310 class A {
311   A([[gnu::unused]] int a);
312 };
313 A::A([[gnu::unused]] int a) {}
314 
315 namespace GccConst {
316   // GCC's tokenizer treats const and __const as the same token.
317   [[gnu::const]] int *f1();
318   [[gnu::__const]] int *f2();
319   [[gnu::__const__]] int *f3();
320   void f(const int *);
321   void g() { f(f1()); f(f2()); }
322   void h() { f(f3()); }
323 }
324 
325 namespace GccASan {
326   __attribute__((no_address_safety_analysis)) void f1();
327   __attribute__((no_sanitize_address)) void f2();
328   [[gnu::no_address_safety_analysis]] void f3();
329   [[gnu::no_sanitize_address]] void f4();
330 }
331 
332 namespace {
333   [[deprecated]] void bar();
334   // expected-warning@-1 {{use of the 'deprecated' attribute is a C++14 extension}}
335   [[deprecated("hello")]] void baz();
336   // expected-warning@-1 {{use of the 'deprecated' attribute is a C++14 extension}}
337   [[deprecated()]] void foo();
338   // expected-error@-1 {{parentheses must be omitted if 'deprecated' attribute's argument list is empty}}
339   [[gnu::deprecated()]] void quux();
340 }
341 
342 namespace {
343 [[ // expected-error {{expected ']'}}
344 #pragma pack(pop)
345 deprecated
346 ]] void bad();
347 }
348 
349 int fallthru(int n) {
350   switch (n) {
351   case 0:
352     n += 5;
353     [[fallthrough]]; // expected-warning {{use of the 'fallthrough' attribute is a C++1z extension}}
354   case 1:
355     n *= 2;
356     break;
357   }
358   return n;
359 }
360 
361 #define attr_name bitand
362 #define attr_name_2(x) x
363 #define attr_name_3(x, y) x##y
364 [[attr_name, attr_name_2(bitor), attr_name_3(com, pl)]] int macro_attrs; // expected-warning {{unknown attribute 'compl' ignored}} \
365    expected-warning {{unknown attribute 'bitor' ignored}} \
366    expected-warning {{unknown attribute 'bitand' ignored}}
367