75 lines · c
1// RUN: %clang_cc1 -Wno-pointer-to-int-cast -fsyntax-only -verify %s2 3#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)4 5typedef struct P { int i; float f; } PT;6struct external_sun3_core7{8 unsigned c_regs;9 10 PT X[100];11 12};13 14// Ensure the builtin works as a constant expression15int i = offsetof(PT, f);16 17void swap(void)18{19 int x;20 x = offsetof(struct external_sun3_core, c_regs);21 x = __builtin_offsetof(struct external_sun3_core, X[42].f);22 23 x = __builtin_offsetof(struct external_sun3_core, X[42].f2); // expected-error {{no member named 'f2'}}24 x = __builtin_offsetof(int, X[42].f2); // expected-error {{offsetof requires struct}}25 26 int a[__builtin_offsetof(struct external_sun3_core, X) == 4 ? 1 : -1];27 int b[__builtin_offsetof(struct external_sun3_core, X[42]) == 340 ? 1 : -1];28 int c[__builtin_offsetof(struct external_sun3_core, X[42].f2) == 344 ? 1 : -1]; // expected-error {{no member named 'f2'}}29}30 31extern int f(void);32 33struct s1 { int a; };34int v1 = offsetof (struct s1, a) == 0 ? 0 : f();35 36struct s2 { int a; };37int v2 = (int)(&((struct s2 *) 0)->a) == 0 ? 0 : f();38 39struct s3 { int a; };40int v3 = __builtin_offsetof(struct s3, a) == 0 ? 0 : f();41 42// PR339643struct sockaddr_un {44 unsigned char sun_len;45 char sun_path[104];46};47int a(int len) {48int a[__builtin_offsetof(struct sockaddr_un, sun_path[len+1])];49}50 51// PR407952union x {struct {int x;};};53int x[__builtin_offsetof(union x, x)];54 55struct incomplete; // expected-note 2 {{forward declaration of 'struct incomplete'}}56int test1[__builtin_offsetof(struct incomplete, foo)]; // expected-error {{offsetof of incomplete type 'struct incomplete'}}57 58int test2[__builtin_offsetof(struct incomplete[10], [4].foo)]; // expected-error {{array has incomplete element type 'struct incomplete'}}59 60// Bitfields61struct has_bitfields {62 int i : 7;63 int j : 12; // expected-note{{bit-field is declared here}}64};65 66int test3 = __builtin_offsetof(struct has_bitfields, j); // expected-error{{cannot compute offset of bit-field 'j'}}67 68typedef struct Array { int array[1]; } Array;69int test4 = __builtin_offsetof(Array, array);70 71int test5(void) {72 return __builtin_offsetof(Array, array[*(int*)0]); // expected-warning{{indirection of non-volatile null pointer}} expected-note{{__builtin_trap}}73}74 75