tests/tests2/94_generic.c

   1 #include <stdio.h>
   2
   3 const int a = 0;
   4
   5 struct a {
   6         int a;
   7 };
   8
   9 struct b {
  10         int a;
  11 };
  12
  13 int a_f()
  14 {
  15         return 20;
  16 }
  17
  18 int b_f()
  19 {
  20         return 10;
  21 }
  22
  23 typedef int (*fptr)(int);
  24 int foo(int i)
  25 {
  26   return i;
  27 }
  28
  29 typedef int int_type1;
  30
  31 #define gen_sw(a) _Generic(a, const char *: 1, default: 8, int: 123);
  32
  33 int main()
  34 {
  35         int i = 0;
  36         signed long int l = 2;
  37         struct b titi;
  38         const int * const ptr;
  39         const char *ti;
  40         int_type1 i2;
  41
  42         i = _Generic(a, int: a_f, const int: b_f)();
  43         printf("%d\n", i);
  44         i = _Generic(a, int: a_f() / 2, const int: b_f() / 2);
  45         printf("%d\n", i);
  46         i = _Generic(ptr, int *:1, int * const:2, default:20);
  47         printf("%d\n", i);
  48         i = gen_sw(a);
  49         printf("%d\n", i);
  50         i = _Generic(titi, struct a:1, struct b:2, default:20);
  51         printf("%d\n", i);
  52         i = _Generic(i2, char: 1, int : 0);
  53         printf("%d\n", i);
  54         i = _Generic(a, char:1, int[4]:2, default:5);
  55         printf("%d\n", i);
  56         i = _Generic(17, int :1, int **:2);
  57         printf("%d\n", i);
  58         i = _Generic(17L, int :1, long :2, long long : 3);
  59         printf("%d\n", i);
  60         i = _Generic("17, io", char *: 3, const char *: 1);
  61         printf("%d\n", i);
  62         i = _Generic(ti, const unsigned char *:1, const char *:4, char *:3,
  63                      const signed char *:2);
  64         printf("%d\n", i);
  65         printf("%s\n", _Generic(i + 2L, long: "long", int: "int",
  66                                 long long: "long long"));
  67         i = _Generic(l, long: 1, int: 2);
  68         printf("%d\n", i);
  69         i = _Generic(foo, fptr: 3, int: 4);
  70         printf("%d\n", i);
  71
  72         (void)_Generic((int(*)[2]){0}, int(*)[2]:0, int(*)[4]:0); //shouldn't match twice
  73
  74         //should accept ({ }) in the controlling expr of _Generic even in const_wanted contexts
  75         struct { _Bool x_0: _Generic(({0;}),default:1); } my_x;
  76
  77         _Generic((__typeof((float const)((float const){42}))*){0}, float*: 0); //casts lose top-level qualifiers
  78         int const x = 42; __typeof((__typeof(x))x) *xp = 0; (void)_Generic(xp, int*: 0); //casts lose top-level qualifiers
  79
  80         //TEST TERNARY:
  81         //Same type
  82         _Generic( 0?(long*)0:(long*)0,  long*: (void)0);
  83         //combining of qualifiers
  84         _Generic( 0?(long volatile*)0:(long const*)0,  long const volatile*: (void)0);
  85         //nul-ptr constant selects other type
  86         _Generic( 0?(long*)0:0,                 long*: (void)0);
  87         _Generic( 0?(long*)0:(void*)0, long*: (void)0);
  88
  89         //void ptrs get chosen preferentially; qualifs still combine
  90         _Generic( 0?(int volatile*)0: (void const*)1, void volatile const*: (void)0);
  91         //like gcc but not clang, don't treat (void* const as the null-ptr constant)
  92         _Generic( 0?(int volatile*)0: (void const*)0, void volatile const*: (void)0);
  93
  94         //ptrs to incomplete types get completed
  95         (void)(sizeof(struct { int x:_Generic( 0?(int (*)[4])0 : (int (*)[])0, int (*)[4]:+1, int (*)[5]:(void)0); }));
  96         (void)(sizeof(struct { int x:_Generic( 0?(int (*)[])0 : (int (*)[4])0, int (*)[4]:+1, int (*)[5]:(void)0); }));
  97
  98         {
  99           /* completion shouldn't affect the type of decl */
 100                 char **argv;
 101                 _Generic(argv, char**: (void)0);
 102                 _Generic(0?(char const*)0:argv[0], char const*: (void)0);
 103                 _Generic(argv, char**: (void)0);
 104         }
 105         {
 106           extern int (*ar)[];
 107           (void)(sizeof(struct { int x:_Generic( 0?(int (*)[4])0 : (int (*)[])0, int (*)[4]:+1, int (*)[5]:(void)0); }));
 108           (void)(sizeof(struct { int x:_Generic( 0?(int (*)[])0 : (int (*)[4])0, int (*)[4]:+1, int (*)[5]:(void)0); }));
 109           (void)(sizeof(struct { int x:_Generic( 0?ar : (int (*)[4])0, int (*)[4]:+1, int (*)[5]:(void)0); }));
 110           (void)(sizeof(struct { int x:_Generic( 0?(int (*)[4])0 : ar, int (*)[4]:+1, int (*)[5]:(void)0); }));
 111           (void)(sizeof(struct { int x:_Generic( 0?(int (*)[5])0 : ar, int (*)[5]:+1, int (*)[4]:(void)0); }));
 112         }
 113
 114         return 0;
 115 }