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/* bf-ms-layout.c */

/* Test for MS bitfield layout */

/* 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 "-mms-bitfields -D_TEST_MS_LAYOUT" } */

#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;

};