e0ac46e69d
This reverts commit d618f1c3b12effd0c2bdb7d02108d3551f389d3d. This commit wasn't reviewed ahead of time and significant concerns were raised immediately after it landed. According to our developer policy this warrants immediate revert of the commit. https://llvm.org/docs/DeveloperPolicy.html#patch-reversion-policy Differential Revision: https://reviews.llvm.org/D155509
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
// RUN: %clang_cc1 -Wno-pointer-to-int-cast -fsyntax-only -verify %s
|
|
|
|
#define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER)
|
|
|
|
typedef struct P { int i; float f; } PT;
|
|
struct external_sun3_core
|
|
{
|
|
unsigned c_regs;
|
|
|
|
PT X[100];
|
|
|
|
};
|
|
|
|
// Ensure the builtin works as a constant expression
|
|
int i = offsetof(PT, f);
|
|
|
|
void swap(void)
|
|
{
|
|
int x;
|
|
x = offsetof(struct external_sun3_core, c_regs);
|
|
x = __builtin_offsetof(struct external_sun3_core, X[42].f);
|
|
|
|
x = __builtin_offsetof(struct external_sun3_core, X[42].f2); // expected-error {{no member named 'f2'}}
|
|
x = __builtin_offsetof(int, X[42].f2); // expected-error {{offsetof requires struct}}
|
|
|
|
int a[__builtin_offsetof(struct external_sun3_core, X) == 4 ? 1 : -1];
|
|
int b[__builtin_offsetof(struct external_sun3_core, X[42]) == 340 ? 1 : -1];
|
|
int c[__builtin_offsetof(struct external_sun3_core, X[42].f2) == 344 ? 1 : -1]; // expected-error {{no member named 'f2'}}
|
|
}
|
|
|
|
extern int f(void);
|
|
|
|
struct s1 { int a; };
|
|
int v1 = offsetof (struct s1, a) == 0 ? 0 : f();
|
|
|
|
struct s2 { int a; };
|
|
int v2 = (int)(&((struct s2 *) 0)->a) == 0 ? 0 : f();
|
|
|
|
struct s3 { int a; };
|
|
int v3 = __builtin_offsetof(struct s3, a) == 0 ? 0 : f();
|
|
|
|
// PR3396
|
|
struct sockaddr_un {
|
|
unsigned char sun_len;
|
|
char sun_path[104];
|
|
};
|
|
int a(int len) {
|
|
int a[__builtin_offsetof(struct sockaddr_un, sun_path[len+1])];
|
|
}
|
|
|
|
// PR4079
|
|
union x {struct {int x;};};
|
|
int x[__builtin_offsetof(union x, x)];
|
|
|
|
// rdar://problem/7222956
|
|
struct incomplete; // expected-note 2 {{forward declaration of 'struct incomplete'}}
|
|
int test1[__builtin_offsetof(struct incomplete, foo)]; // expected-error {{offsetof of incomplete type 'struct incomplete'}}
|
|
|
|
int test2[__builtin_offsetof(struct incomplete[10], [4].foo)]; // expected-error {{array has incomplete element type 'struct incomplete'}}
|
|
|
|
// Bitfields
|
|
struct has_bitfields {
|
|
int i : 7;
|
|
int j : 12; // expected-note{{bit-field is declared here}}
|
|
};
|
|
|
|
int test3 = __builtin_offsetof(struct has_bitfields, j); // expected-error{{cannot compute offset of bit-field 'j'}}
|
|
|
|
typedef struct Array { int array[1]; } Array;
|
|
int test4 = __builtin_offsetof(Array, array);
|
|
|
|
int test5(void) {
|
|
return __builtin_offsetof(Array, array[*(int*)0]); // expected-warning{{indirection of non-volatile null pointer}} expected-note{{__builtin_trap}}
|
|
}
|
|
|