1 // RUN: %clang_cc1 %s -fsyntax-only -verify -triple=i686-apple-darwin9 2 // expected-no-diagnostics 3 4 #define CHECK_SIZE(kind, name, size) extern int name##1[sizeof(kind name) == size ? 1 : -1]; 5 #define CHECK_ALIGN(kind, name, size) extern int name##2[__alignof(kind name) == size ? 1 : -1]; 6 7 // Zero-width bit-fields 8 struct a {char x; int : 0; char y;}; 9 CHECK_SIZE(struct, a, 5) 10 CHECK_ALIGN(struct, a, 1) 11 12 // Zero-width bit-fields with packed 13 struct __attribute__((packed)) a2 { short x : 9; char : 0; int y : 17; }; 14 CHECK_SIZE(struct, a2, 5) 15 CHECK_ALIGN(struct, a2, 1) 16 17 // Zero-width bit-fields at the end of packed struct 18 struct __attribute__((packed)) a3 { short x : 9; int : 0; }; 19 CHECK_SIZE(struct, a3, 4) 20 CHECK_ALIGN(struct, a3, 1) 21 22 // For comparison, non-zero-width bit-fields at the end of packed struct 23 struct __attribute__((packed)) a4 { short x : 9; int : 1; }; 24 CHECK_SIZE(struct, a4, 2) 25 CHECK_ALIGN(struct, a4, 1) 26 27 union b {char x; int : 0; char y;}; 28 CHECK_SIZE(union, b, 1) 29 CHECK_ALIGN(union, b, 1) 30 31 // Unnamed bit-field align 32 struct c {char x; int : 20;}; 33 CHECK_SIZE(struct, c, 4) 34 CHECK_ALIGN(struct, c, 1) 35 36 union d {char x; int : 20;}; 37 CHECK_SIZE(union, d, 3) 38 CHECK_ALIGN(union, d, 1) 39 40 // Bit-field packing 41 struct __attribute__((packed)) e {int x : 4, y : 30, z : 30;}; 42 CHECK_SIZE(struct, e, 8) 43 CHECK_ALIGN(struct, e, 1) 44 45 // Alignment on bit-fields 46 struct f {__attribute((aligned(8))) int x : 30, y : 30, z : 30;}; 47 CHECK_SIZE(struct, f, 24) 48 CHECK_ALIGN(struct, f, 8) 49 50 // Large structure (overflows i32, in bits). 51 struct s0 { 52 char a[0x32100000]; 53 int x:30, y:30; 54 }; 55 56 CHECK_SIZE(struct, s0, 0x32100008) 57 CHECK_ALIGN(struct, s0, 4) 58 59
