test/Sema/offsetof.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
   4
   5 typedef struct P { int i; float f; } PT;
   6 struct external_sun3_core
   7 {
   8  unsigned c_regs;
   9
  10   PT  X[100];
  11
  12 };
  13
  14 void swap()
  15 {
  16   int x;
  17   x = offsetof(struct external_sun3_core, c_regs);
  18   x = __builtin_offsetof(struct external_sun3_core, X[42].f);
  19
  20   x = __builtin_offsetof(struct external_sun3_core, X[42].f2);  // expected-error {{no member named 'f2'}}
  21   x = __builtin_offsetof(int, X[42].f2);  // expected-error {{offsetof requires struct}}
  22
  23   int a[__builtin_offsetof(struct external_sun3_core, X) == 4 ? 1 : -1];
  24   int b[__builtin_offsetof(struct external_sun3_core, X[42]) == 340 ? 1 : -1];
  25   int c[__builtin_offsetof(struct external_sun3_core, X[42].f2) == 344 ? 1 : -1];  // expected-error {{no member named 'f2'}}
  26 }
  27
  28 extern int f();
  29
  30 struct s1 { int a; };
  31 int v1 = offsetof (struct s1, a) == 0 ? 0 : f();
  32
  33 struct s2 { int a; };
  34 int v2 = (int)(&((struct s2 *) 0)->a) == 0 ? 0 : f();
  35
  36 struct s3 { int a; };
  37 int v3 = __builtin_offsetof(struct s3, a) == 0 ? 0 : f();
  38
  39 // PR3396
  40 struct sockaddr_un {
  41  unsigned char sun_len;
  42  char sun_path[104];
  43 };
  44 int a(int len) {
  45 int a[__builtin_offsetof(struct sockaddr_un, sun_path[len+1])];
  46 }
  47
  48 // PR4079
  49 union x {struct {int x;};};
  50 int x[__builtin_offsetof(union x, x)];
  51
  52 // rdar://problem/7222956
  53 struct incomplete; // expected-note 2 {{forward declaration of 'struct incomplete'}}
  54 int test1[__builtin_offsetof(struct incomplete, foo)]; // expected-error {{offsetof of incomplete type 'struct incomplete'}}
  55
  56 int test2[__builtin_offsetof(struct incomplete[10], [4].foo)]; // expected-error {{array has incomplete element type 'struct incomplete'}}
  57
  58 // Bitfields
  59 struct has_bitfields {
  60   int i : 7;
  61   int j : 12; // expected-note{{bit-field is declared here}}
  62 };
  63
  64 int test3 = __builtin_offsetof(struct has_bitfields, j); // expected-error{{cannot compute offset of bit-field 'j'}}
  65
  66 typedef struct Array { int array[1]; } Array;
  67 int test4 = __builtin_offsetof(Array, array);