| 1 | // RUN: %clang_cc1 -fsyntax-only -verify %s |
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| 2 | |
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| 3 | #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) |
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| 4 | |
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| 5 | typedef struct P { int i; float f; } PT; |
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| 6 | struct external_sun3_core |
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| 7 | { |
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| 8 | unsigned c_regs; |
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| 9 | |
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| 10 | PT X[100]; |
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| 11 | |
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| 12 | }; |
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| 13 | |
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| 14 | void swap() |
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| 15 | { |
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| 16 | int x; |
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| 17 | x = offsetof(struct external_sun3_core, c_regs); |
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| 18 | x = __builtin_offsetof(struct external_sun3_core, X[42].f); |
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| 19 | |
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| 20 | x = __builtin_offsetof(struct external_sun3_core, X[42].f2); // expected-error {{no member named 'f2'}} |
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| 21 | x = __builtin_offsetof(int, X[42].f2); // expected-error {{offsetof requires struct}} |
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| 22 | |
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| 23 | int a[__builtin_offsetof(struct external_sun3_core, X) == 4 ? 1 : -1]; |
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| 24 | int b[__builtin_offsetof(struct external_sun3_core, X[42]) == 340 ? 1 : -1]; |
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| 25 | int c[__builtin_offsetof(struct external_sun3_core, X[42].f2) == 344 ? 1 : -1]; // expected-error {{no member named 'f2'}} |
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| 26 | } |
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| 27 | |
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| 28 | extern int f(); |
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| 29 | |
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| 30 | struct s1 { int a; }; |
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| 31 | int v1 = offsetof (struct s1, a) == 0 ? 0 : f(); |
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| 32 | |
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| 33 | struct s2 { int a; }; |
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| 34 | int v2 = (int)(&((struct s2 *) 0)->a) == 0 ? 0 : f(); |
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| 35 | |
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| 36 | struct s3 { int a; }; |
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| 37 | int v3 = __builtin_offsetof(struct s3, a) == 0 ? 0 : f(); |
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| 38 | |
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| 39 | // PR3396 |
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| 40 | struct sockaddr_un { |
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| 41 | unsigned char sun_len; |
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| 42 | char sun_path[104]; |
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| 43 | }; |
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| 44 | int a(int len) { |
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| 45 | int a[__builtin_offsetof(struct sockaddr_un, sun_path[len+1])]; |
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| 46 | } |
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| 47 | |
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| 48 | // PR4079 |
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| 49 | union x {struct {int x;};}; |
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| 50 | int x[__builtin_offsetof(union x, x)]; |
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| 51 | |
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| 52 | // rdar://problem/7222956 |
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| 53 | struct incomplete; // expected-note 2 {{forward declaration of 'struct incomplete'}} |
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| 54 | int test1[__builtin_offsetof(struct incomplete, foo)]; // expected-error {{offsetof of incomplete type 'struct incomplete'}} |
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| 55 | |
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| 56 | int test2[__builtin_offsetof(struct incomplete[10], [4].foo)]; // expected-error {{array has incomplete element type 'struct incomplete'}} |
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| 57 | |
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| 58 | // Bitfields |
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| 59 | struct has_bitfields { |
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| 60 | int i : 7; |
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| 61 | int j : 12; // expected-note{{bit-field is declared here}} |
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| 62 | }; |
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| 63 | |
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| 64 | int test3 = __builtin_offsetof(struct has_bitfields, j); // expected-error{{cannot compute offset of bit-field 'j'}} |
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| 65 | |
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| 66 | typedef struct Array { int array[1]; } Array; |
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| 67 | int test4 = __builtin_offsetof(Array, array); |
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| 68 | |
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| 69 | int test5() { |
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| 70 | return __builtin_offsetof(Array, array[*(int*)0]); // expected-warning{{indirection of non-volatile null pointer}} expected-note{{__builtin_trap}} |
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| 71 | } |
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| 72 | |
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| 73 | |
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