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); 68 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
