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 
swap()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 };
a(int len)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);
68 
test5()69 int test5() {
70   return __builtin_offsetof(Array, array[*(int*)0]); // expected-warning{{indirection of non-volatile null pointer}} expected-note{{__builtin_trap}}
71 }
72 
73