clang/test/Parser/c2x-attributes.c

   1 // RUN: %clang_cc1 -fsyntax-only -fdouble-square-bracket-attributes -verify=expected,notc2x -Wno-strict-prototypes %s
   2 // RUN: %clang_cc1 -fsyntax-only -std=gnu2x -verify=expected,c2x %s
   3
   4 enum [[]] E {
   5   One [[]],
   6   Two,
   7   Three [[]]
   8 };
   9
  10 enum [[]] { Four };
  11 [[]] enum E2 { Five }; // expected-error {{misplaced attributes}}
  12
  13 // FIXME: this diagnostic can be improved.
  14 enum { [[]] Six }; // expected-error {{expected identifier}}
  15
  16 // FIXME: this diagnostic can be improved.
  17 enum E3 [[]] { Seven }; // expected-error {{expected identifier or '('}}
  18
  19 [[deprecated([""])]] int WrongArgs; // expected-error {{expected expression}}
  20 [[,,,,,]] int Commas1; // ok
  21 [[,, maybe_unused]] int Commas2; // ok
  22 [[maybe_unused,,,]] int Commas3; // ok
  23 [[,,maybe_unused,]] int Commas4; // ok
  24 [[foo bar]] int NoComma; // expected-error {{expected ','}} \
  25                          // expected-warning {{unknown attribute 'foo' ignored}}
  26
  27 struct [[]] S1 {
  28   int i [[]];
  29   int [[]] j;
  30   int k[10] [[]];
  31   int l[[]][10];
  32   [[]] int m, n;
  33   int o [[]] : 12;
  34   int [[]] : 0; // OK, attribute applies to the type.
  35   int p, [[]] : 0; // expected-error {{an attribute list cannot appear here}}
  36   int q, [[]] r; // expected-error {{an attribute list cannot appear here}}
  37   [[]] int; // expected-error {{an attribute list cannot appear here}} \
  38             // expected-warning {{declaration does not declare anything}}
  39 };
  40
  41 [[]] struct S2 { int a; }; // expected-error {{misplaced attributes}}
  42 struct S3 [[]] { int a; }; // expected-error {{an attribute list cannot appear here}}
  43
  44 union [[]] U {
  45   double d [[]];
  46   [[]] int i;
  47 };
  48
  49 [[]] union U2 { double d; }; // expected-error {{misplaced attributes}}
  50 union U3 [[]] { double d; }; // expected-error {{an attribute list cannot appear here}}
  51
  52 struct [[]] IncompleteStruct;
  53 union [[]] IncompleteUnion;
  54 enum [[]] IncompleteEnum;
  55 enum __attribute__((deprecated)) IncompleteEnum2;
  56
  57 [[]] void f1(void);
  58 void [[]] f2(void);
  59 void f3 [[]] (void);
  60 void f4(void) [[]];
  61
  62 void f5(int i [[]], [[]] int j, int [[]] k);
  63
  64 void f6(a, b) [[]] int a; int b; { // notc2x-error {{an attribute list cannot appear here}} \
  65                                       c2x-error {{unknown type name 'a'}} \
  66                                       c2x-error {{unknown type name 'b'}} \
  67                                       c2x-error {{expected ';' after top level declarator}} \
  68                                       c2x-error {{expected identifier or '('}}
  69 }
  70
  71 // FIXME: technically, an attribute list cannot appear here, but we currently
  72 // parse it as part of the return type of the function, which is reasonable
  73 // behavior given that we *don't* want to parse it as part of the K&R parameter
  74 // declarations. It is disallowed to avoid a parsing ambiguity we already
  75 // handle well.
  76 int (*f7(a, b))(int, int) [[]] int a; int b; { // c2x-error {{unknown type name 'a'}} \
  77                                                   c2x-error {{unknown type name 'b'}} \
  78                                                   c2x-error {{expected ';' after top level declarator}} \
  79                                                   c2x-error {{expected identifier or '('}}
  80
  81   return 0;
  82 }
  83
  84 [[]] int a, b;
  85 int c [[]], d [[]];
  86
  87 void f8(void) [[]] {
  88   [[]] int i, j;
  89   int k, l [[]];
  90 }
  91
  92 [[]] void f9(void) {
  93   int i[10] [[]];
  94   int (*fp1)(void)[[]];
  95   int (*fp2 [[]])(void);
  96
  97   int * [[]] *ipp;
  98 }
  99
 100 void f10(int j[static 10] [[]], int k[*] [[]]);
 101
 102 void f11(void) {
 103   [[]] {}
 104   [[]] if (1) {}
 105
 106   [[]] switch (1) {
 107   [[]] case 1: [[]] break;
 108   [[]] default: break;
 109   }
 110
 111   goto foo;
 112   [[]] foo: (void)1;
 113
 114   [[]] for (;;);
 115   [[]] while (1);
 116   [[]] do [[]] { } while(1);
 117
 118   [[]] (void)1;
 119
 120   [[]];
 121
 122   (void)sizeof(int [4][[]]);
 123   (void)sizeof(struct [[]] S3 { int a [[]]; });
 124
 125   [[]] return;
 126 }
 127
 128 [[attr]] void f12(void); // expected-warning {{unknown attribute 'attr' ignored}}
 129 [[vendor::attr]] void f13(void); // expected-warning {{unknown attribute 'attr' ignored}}
 130
 131 // Ensure that asm statements properly handle double colons.
 132 void test_asm(void) {
 133   asm("ret" :::);
 134   asm("foo" :: "r" (xx)); // expected-error {{use of undeclared identifier 'xx'}}
 135 }
 136
 137 // Do not allow 'using' to introduce vendor attribute namespaces.
 138 [[using vendor: attr1, attr2]] void f14(void); // expected-error {{expected ','}} \
 139                                                // expected-warning {{unknown attribute 'using' ignored}}
 140
 141 struct [[]] S4 *s; // expected-error {{an attribute list cannot appear here}}
 142 struct S5 {};
 143 int c = sizeof(struct [[]] S5); // expected-error {{an attribute list cannot appear here}}
 144
 145 // Ensure that '::' outside of attributes does not crash and is not treated as scope
 146 double n::v; // expected-error {{expected ';' after top level declarator}}