gcc/testsuite/gcc.dg/bf-no-ms-layout.c

   1 /* bf-no-ms-layout.c */
   2
   3 /* Test for gcc bitfield layout, with -mno-ms-bitfields */
   4 /* Adapted from Donn Terry <donnte@microsoft.com> testcase
   5    posted to GCC-patches
   6    http://gcc.gnu.org/ml/gcc-patches/2000-08/msg00577.html */
   7
   8 /* { dg-do run { target *-*-mingw* *-*-cygwin* i?86-*-darwin } } */
   9 /* { dg-options "-mno-ms-bitfields" } */
  10
  11 #include <stddef.h>
  12 #include <string.h>
  13
  14 extern void abort();
  15
  16 #pragma pack(8)
  17
  18 struct one {
  19   int d;
  20   unsigned char a;
  21   unsigned short b:7;
  22   char c;
  23 };
  24
  25 struct two {
  26   int d;
  27   unsigned char a;
  28   unsigned int b:7;
  29   char c;
  30 };
  31
  32 struct three {
  33   short d;
  34   unsigned short a:3;
  35   unsigned short b:9;
  36   unsigned char c:7;
  37 };
  38
  39
  40 /* Bitfields of size 0 have some truly odd behaviors. */
  41
  42 struct four {
  43   unsigned short a:3;
  44   unsigned short b:9;
  45   unsigned int :0;  /* forces struct alignment to int */
  46   unsigned char c:7;
  47 };
  48
  49 struct five {
  50   char a;
  51   int :0;        /* ignored; prior field is not a bitfield. */
  52   char b;
  53   char c;
  54 };
  55
  56 struct six {
  57   char a :8;
  58   int :0;       /* not ignored; prior field IS a bitfield, causes
  59                    struct alignment as well. */
  60   char b;
  61   char c;
  62 } ;
  63
  64 struct seven {
  65   char a:8;
  66   char :0;
  67   int  :0;      /* Ignored; prior field is zero size bitfield. */
  68   char b;
  69   char c;
  70 };
  71
  72 struct eight { /* ms size 4 */
  73   short b:3;
  74   char  c;
  75 };
  76
  77 #ifdef _MSC_VER
  78 #define LONGLONG __int64
  79 #else
  80 #define LONGLONG long long
  81 #endif
  82
  83 union nine {   /* ms size 8 */
  84   LONGLONG a:3;
  85   char  c;
  86 };
  87
  88 struct ten {   /* ms size 16 */
  89   LONGLONG a:3;
  90   LONGLONG b:3;
  91   char  c;
  92 };
  93
  94
  95 #define val(s,f) (s.f)
  96
  97 #define check_struct(_X) \
  98 { \
  99   if (sizeof (struct _X) != exp_sizeof_##_X )   \
 100     abort();                                    \
 101   memcpy(&test_##_X, filler, sizeof(test_##_X));\
 102   if (val(test_##_X,c) != exp_##_X##_c)         \
 103      abort();                                   \
 104 }
 105
 106 #define check_union(_X) \
 107 { \
 108   if (sizeof (union _X) != exp_sizeof_##_X )    \
 109     abort();                                    \
 110   memcpy(&test_##_X, filler, sizeof(test_##_X));\
 111   if (val(test_##_X,c) != exp_##_X##_c)         \
 112      abort();                                   \
 113 }
 114
 115 #define check_struct_size(_X) \
 116 { \
 117   if (sizeof (struct _X) != exp_sizeof_##_X )   \
 118     abort();                                    \
 119 }
 120
 121 #define check_struct_off(_X) \
 122 { \
 123   memcpy(&test_##_X, filler, sizeof(test_##_X));\
 124   if (val(test_##_X,c) != exp_##_X##_c)         \
 125     abort();                                    \
 126 }
 127
 128 #define check_union_size(_X) \
 129 { \
 130   if (sizeof (union _X) != exp_sizeof_##_X )    \
 131     abort();                                    \
 132 }
 133
 134 #define check_union_off(_X) \
 135 { \
 136   memcpy(&test_##_X, filler, sizeof(test_##_X));\
 137   if (val(test_##_X,c) != exp_##_X##_c)         \
 138     abort();                                    \
 139 }
 140
 141 int main(){
 142
 143   unsigned char filler[16];
 144   struct one test_one;
 145   struct two test_two;
 146   struct three test_three;
 147   struct four test_four;
 148   struct five test_five;
 149   struct six test_six;
 150   struct seven test_seven;
 151   struct eight test_eight;
 152   union nine test_nine;
 153   struct ten test_ten;
 154
 155 #if defined (_TEST_MS_LAYOUT) || defined (_MSC_VER)
 156   size_t exp_sizeof_one = 12;
 157   size_t exp_sizeof_two = 16;
 158   size_t exp_sizeof_three =6;
 159   size_t exp_sizeof_four = 8;
 160   size_t exp_sizeof_five = 3;
 161   size_t exp_sizeof_six = 8;
 162   size_t exp_sizeof_seven = 3;
 163   size_t exp_sizeof_eight = 4;
 164   size_t exp_sizeof_nine = 8;
 165   size_t exp_sizeof_ten = 16;
 166
 167   unsigned char exp_one_c = 8;
 168   unsigned char exp_two_c  = 12;
 169   unsigned char exp_three_c = 4;
 170   unsigned char exp_four_c = 4;
 171   char exp_five_c = 2;
 172   char exp_six_c = 5;
 173   char exp_seven_c = 2;
 174   char exp_eight_c = 2;
 175   char exp_nine_c = 0;
 176   char exp_ten_c = 8;
 177
 178 #else /* testing -mno-ms-bitfields */
 179
 180   size_t exp_sizeof_one = 8;
 181   size_t exp_sizeof_two = 8;
 182   size_t exp_sizeof_three = 6;
 183   size_t exp_sizeof_four = 6;
 184   size_t exp_sizeof_five = 6;
 185   size_t exp_sizeof_six = 6;
 186   size_t exp_sizeof_seven = 6;
 187   size_t exp_sizeof_eight = 2;
 188   size_t exp_sizeof_nine = 8;
 189   size_t exp_sizeof_ten = 8;
 190
 191   unsigned short exp_one_c = 6;
 192   unsigned int exp_two_c  = 6;
 193   unsigned char exp_three_c = 64;
 194   unsigned char exp_four_c = 4;
 195   char exp_five_c = 5;
 196   char exp_six_c = 5;
 197   char exp_seven_c = 5;
 198   char exp_eight_c = 1;
 199   char exp_nine_c = 0;
 200   char exp_ten_c = 1;
 201
 202 #endif
 203
 204   unsigned char i;
 205   for ( i = 0; i < 16; i++ )
 206     filler[i] = i;
 207
 208   check_struct_off (one);
 209   check_struct_off (two);
 210   check_struct_off (three);
 211   check_struct_off (four);
 212   check_struct_off (five);
 213   check_struct_off (six);
 214   check_struct_off (seven);
 215   check_struct_off (eight);
 216   check_union_off (nine);
 217   check_struct_off (ten);
 218
 219   check_struct_size (one);
 220   check_struct_size (two);
 221   check_struct_size (three);
 222   check_struct_size (four);
 223   check_struct_size (five);
 224   check_struct_size (six);
 225   check_struct_size (seven);
 226   check_struct_size (eight);
 227   check_union_size (nine);
 228   check_struct_size (ten);
 229
 230   return 0;
 231 };