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
4namespace 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;
39int [[]] between_attr;
40const [[]] int between_attr_2 = 0; // expected-error {{an attribute list cannot appear here}}
41int after_attr [[]];
42int * [[]] ptr_attr;
43int & [[]] ref_attr = after_attr;
44int & [[unknown]] ref_attr_2 = after_attr; // expected-warning {{unknown attribute 'unknown' ignored}}
45int & [[noreturn]] ref_attr_3 = after_attr; // expected-error {{'noreturn' attribute cannot be applied to types}}
46int && [[]] rref_attr = 0;
47int array_attr [1] [[]];
48alignas(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 ']'}}
59void fn_attr () [[]];
60void noexcept_fn_attr () noexcept [[]];
61struct MemberFnOrder {
62  virtual void f() const volatile && noexcept [[]] final = 0;
63};
64struct [[]] struct_attr;
65class [[]] class_attr {};
66union [[]] union_attr;
67
68// Checks attributes placed at wrong syntactic locations of class specifiers.
69class [[]] [[]]
70  attr_after_class_name_decl [[]] [[]]; // expected-error {{an attribute list cannot appear here}}
71
72class [[]] [[]]
73 attr_after_class_name_definition [[]] [[]] [[]]{}; // expected-error {{an attribute list cannot appear here}}
74
75class [[]] c {};
76class c [[]] [[]] x;
77class c [[]] [[]] y [[]] [[]];
78class c final [(int){0}];
79
80class base {};
81class [[]] [[]] 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
85class [[]] [[]] 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:
90class 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}}
91class 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}}
95template<typename> [[]] struct no_init_declarators_template; // expected-error {{an attribute list cannot appear here}}
96void 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[[]];
101struct ctordtor {
102  [[]] ctordtor();
103  [[]] ~ctordtor();
104};
105[[]] ctordtor::ctordtor() {}
106[[]] ctordtor::~ctordtor() {}
107extern "C++" [[]] int extern_attr;
108template <typename T> [[]] void template_attr ();
109[[]] [[]] int [[]] [[]] multi_attr [[]] [[]];
110
111int comma_attr [[,]];
112int scope_attr [[foo::]]; // expected-error {{expected identifier}}
113int (paren_attr) [[]]; // expected-error {{an attribute list cannot appear here}}
114unsigned [[]] int attr_in_decl_spec; // expected-error {{an attribute list cannot appear here}}
115unsigned [[]] int [[]] const double_decl_spec = 0; // expected-error 2{{an attribute list cannot appear here}}
116class foo {
117  void const_after_attr () [[]] const; // expected-error {{expected ';'}}
118};
119extern "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}}
128namespace [[]] ns2 {} // expected-warning {{attributes on a namespace declaration are incompatible with C++ standards before C++1z}}
129
130using [[]] alignas(4) [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
131using [[]] alignas(4) [[]] foobar = int; // expected-error {{an attribute list cannot appear here}} expected-error {{'alignas' attribute only applies to}}
132
133void 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}}
149using T [[]] = int; // ok
150template<typename T> using U [[]] = T;
151using ns::i [[]]; // expected-error {{an attribute list cannot appear here}}
152using [[]] ns::i; // expected-error {{an attribute list cannot appear here}}
153using T [[unknown]] = int; // expected-warning {{unknown attribute 'unknown' ignored}}
154using T [[noreturn]] = int; // expected-error {{'noreturn' attribute only applies to functions}}
155using V = int; // expected-note {{previous}}
156using V [[gnu::vector_size(16)]] = int; // expected-error {{redefinition with different types}}
157
158auto trailing() -> [[]] const int; // expected-error {{an attribute list cannot appear here}}
159auto trailing() -> const [[]] int; // expected-error {{an attribute list cannot appear here}}
160auto trailing() -> const int [[]];
161auto trailing_2() -> struct struct_attr [[]];
162
163namespace N {
164  struct S {};
165};
166template<typename> struct Template {};
167
168// FIXME: Improve this diagnostic
169struct [[]] N::S s; // expected-error {{an attribute list cannot appear here}}
170struct [[]] Template<int> t; // expected-error {{an attribute list cannot appear here}}
171struct [[]] ::template Template<int> u; // expected-error {{an attribute list cannot appear here}}
172template struct [[]] Template<char>; // expected-error {{an attribute list cannot appear here}}
173template <> struct [[]] Template<void>;
174
175enum [[]] E1 {};
176enum [[]] E2; // expected-error {{forbids forward references}}
177enum [[]] E1;
178enum [[]] E3 : int;
179enum [[]] {
180  k_123 [[]] = 123 // expected-warning {{attributes on an enumerator declaration are incompatible with C++ standards before C++1z}}
181};
182enum [[]] E1 e; // expected-error {{an attribute list cannot appear here}}
183enum [[]] class E4 { }; // expected-error {{an attribute list cannot appear here}}
184enum struct [[]] E5;
185
186struct 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};
199template<typename T> void tmpl(T) {}
200template void tmpl [[]] (int); // expected-FIXME {{an attribute list cannot appear here}}
201template [[]] void tmpl(char); // expected-error {{an attribute list cannot appear here}}
202template void [[]] tmpl(short);
203
204// Argument tests
205alignas int aligned_no_params; // expected-error {{expected '('}}
206alignas(i) int aligned_nonconst; // expected-error {{'aligned' attribute requires integer constant}} expected-note {{read of non-const variable 'i'}}
207
208// Statement tests
209void 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
242template<typename...Ts> void variadic() {
243  void bar [[noreturn...]] (); // expected-error {{attribute 'noreturn' cannot be used as an attribute pack}}
244}
245
246// Expression tests
247void 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
257void 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
282enum class __attribute__((visibility("hidden"))) SecretKeepers {
283  one, /* rest are deprecated */ two, three
284};
285enum class [[]] EvenMoreSecrets {};
286
287namespace 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.
295unsigned [[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}}
297typedef [[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}}
299int [[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.
302int *[[gnu::unused]] v3; // expected-warning {{attribute 'unused' ignored}}
303int v4[2][[gnu::unused]]; // expected-warning {{attribute 'unused' ignored}}
304int 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
310class A {
311  A([[gnu::unused]] int a);
312};
313A::A([[gnu::unused]] int a) {}
314
315namespace 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
325namespace 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
332namespace {
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
342namespace {
343[[ // expected-error {{expected ']'}}
344#pragma pack(pop)
345deprecated
346]] void bad();
347}
348
349int 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