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/* bf-no-ms-layout.c */
/* Test for gcc bitfield layout, with -mno-ms-bitfields */
/* Adapted from Donn Terry <donnte@microsoft.com> testcase
posted to GCC-patches
http://gcc.gnu.org/ml/gcc-patches/2000-08/msg00577.html */
/* { dg-do run { target *-*-interix* *-*-mingw* *-*-cygwin* i?86-*-darwin } } */
/* { dg-options "-mno-ms-bitfields" } */
#include <stddef.h>
#include <string.h>
extern void abort();
#pragma pack(8)
struct one {
int d;
unsigned char a;
unsigned short b:7;
char c;
};
struct two {
int d;
unsigned char a;
unsigned int b:7;
char c;
};
struct three {
short d;
unsigned short a:3;
unsigned short b:9;
unsigned char c:7;
};
/* Bitfields of size 0 have some truly odd behaviors. */
struct four {
unsigned short a:3;
unsigned short b:9;
unsigned int :0; /* forces struct alignment to int */
unsigned char c:7;
};
struct five {
char a;
int :0; /* ignored; prior field is not a bitfield. */
char b;
char c;
};
struct six {
char a :8;
int :0; /* not ignored; prior field IS a bitfield, causes
struct alignment as well. */
char b;
char c;
} ;
struct seven {
char a:8;
char :0;
int :0; /* Ignored; prior field is zero size bitfield. */
char b;
char c;
};
struct eight { /* ms size 4 */
short b:3;
char c;
};
#ifdef _MSC_VER
#define LONGLONG __int64
#else
#define LONGLONG long long
#endif
union nine { /* ms size 8 */
LONGLONG a:3;
char c;
};
struct ten { /* ms size 16 */
LONGLONG a:3;
LONGLONG b:3;
char c;
};
#define val(s,f) (s.f)
#define check_struct(_X) \
{ \
if (sizeof (struct _X) != exp_sizeof_##_X ) \
abort(); \
memcpy(&test_##_X, filler, sizeof(test_##_X));\
if (val(test_##_X,c) != exp_##_X##_c) \
abort(); \
}
#define check_union(_X) \
{ \
if (sizeof (union _X) != exp_sizeof_##_X ) \
abort(); \
memcpy(&test_##_X, filler, sizeof(test_##_X));\
if (val(test_##_X,c) != exp_##_X##_c) \
abort(); \
}
#define check_struct_size(_X) \
{ \
if (sizeof (struct _X) != exp_sizeof_##_X ) \
abort(); \
}
#define check_struct_off(_X) \
{ \
memcpy(&test_##_X, filler, sizeof(test_##_X));\
if (val(test_##_X,c) != exp_##_X##_c) \
abort(); \
}
#define check_union_size(_X) \
{ \
if (sizeof (union _X) != exp_sizeof_##_X ) \
abort(); \
}
#define check_union_off(_X) \
{ \
memcpy(&test_##_X, filler, sizeof(test_##_X));\
if (val(test_##_X,c) != exp_##_X##_c) \
abort(); \
}
int main(){
unsigned char filler[16];
struct one test_one;
struct two test_two;
struct three test_three;
struct four test_four;
struct five test_five;
struct six test_six;
struct seven test_seven;
struct eight test_eight;
union nine test_nine;
struct ten test_ten;
#if defined (_TEST_MS_LAYOUT) || defined (_MSC_VER)
size_t exp_sizeof_one = 12;
size_t exp_sizeof_two = 16;
size_t exp_sizeof_three =6;
size_t exp_sizeof_four = 8;
size_t exp_sizeof_five = 3;
size_t exp_sizeof_six = 8;
size_t exp_sizeof_seven = 3;
size_t exp_sizeof_eight = 4;
size_t exp_sizeof_nine = 8;
size_t exp_sizeof_ten = 16;
unsigned char exp_one_c = 8;
unsigned char exp_two_c = 12;
unsigned char exp_three_c = 4;
unsigned char exp_four_c = 4;
char exp_five_c = 2;
char exp_six_c = 5;
char exp_seven_c = 2;
char exp_eight_c = 2;
char exp_nine_c = 0;
char exp_ten_c = 8;
#else /* testing -mno-ms-bitfields */
size_t exp_sizeof_one = 8;
size_t exp_sizeof_two = 8;
size_t exp_sizeof_three = 6;
size_t exp_sizeof_four = 6;
size_t exp_sizeof_five = 6;
size_t exp_sizeof_six = 6;
size_t exp_sizeof_seven = 6;
size_t exp_sizeof_eight = 2;
size_t exp_sizeof_nine = 8;
size_t exp_sizeof_ten = 8;
unsigned short exp_one_c = 6;
unsigned int exp_two_c = 6;
unsigned char exp_three_c = 64;
unsigned char exp_four_c = 4;
char exp_five_c = 5;
char exp_six_c = 5;
char exp_seven_c = 5;
char exp_eight_c = 1;
char exp_nine_c = 0;
char exp_ten_c = 1;
#endif
unsigned char i;
for ( i = 0; i < 16; i++ )
filler[i] = i;
check_struct_off (one);
check_struct_off (two);
check_struct_off (three);
check_struct_off (four);
check_struct_off (five);
check_struct_off (six);
check_struct_off (seven);
check_struct_off (eight);
check_union_off (nine);
check_struct_off (ten);
check_struct_size (one);
check_struct_size (two);
check_struct_size (three);
check_struct_size (four);
check_struct_size (five);
check_struct_size (six);
check_struct_size (seven);
check_struct_size (eight);
check_union_size (nine);
check_struct_size (ten);
return 0;
};
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