gdb/testsuite/gdb.base/sizeof.c

   1 #include <stdio.h>
   2
   3 typedef char padding[16];
   4
   5 struct {
   6   padding p1;
   7   char v;
   8   padding p2;
   9 } padding_char;
  10
  11 struct {
  12   padding p1;
  13   short v;
  14   padding p2;
  15 } padding_short;
  16
  17 struct {
  18   padding p1;
  19   int v;
  20   padding p2;
  21 } padding_int;
  22
  23 struct {
  24   padding p1;
  25   long v;
  26   padding p2;
  27 } padding_long;
  28
  29 struct {
  30   padding p1;
  31   long long v;
  32   padding p2;
  33 } padding_long_long;
  34
  35 struct {
  36   padding p1;
  37   float v;
  38   padding p2;
  39 } padding_float;
  40
  41 struct {
  42   padding p1;
  43   double v;
  44   padding p2;
  45 } padding_double;
  46
  47 struct {
  48   padding p1;
  49   long double v;
  50   padding p2;
  51 } padding_long_double;
  52
  53 static void
  54 fill (void *buf, long sizeof_buf)
  55 {
  56   char *p = buf;
  57   int i;
  58   for (i = 0; i < sizeof_buf; i++)
  59     p[i] = "The quick brown dingo jumped over the layzy dog."[i];
  60 }
  61
  62 void
  63 fill_structs (void)
  64 {
  65   fill (&padding_char.p1, sizeof (padding));
  66   fill (&padding_char.v, sizeof (padding_char.v));
  67   fill (&padding_char.p2, sizeof (padding));
  68
  69   fill (&padding_short.p1, sizeof (padding));
  70   fill (&padding_short.v, sizeof (padding_short.v));
  71   fill (&padding_short.p2, sizeof (padding));
  72
  73   fill (&padding_int.p1, sizeof (padding));
  74   fill (&padding_int.v, sizeof (padding_int.v));
  75   fill (&padding_int.p2, sizeof (padding));
  76
  77   fill (&padding_long.p1, sizeof (padding));
  78   fill (&padding_long.v, sizeof (padding_long.v));
  79   fill (&padding_long.p2, sizeof (padding));
  80
  81   fill (&padding_long_long.p1, sizeof (padding));
  82   fill (&padding_long_long.v, sizeof (padding_long_long.v));
  83   fill (&padding_long_long.p2, sizeof (padding));
  84
  85   fill (&padding_float.p1, sizeof (padding));
  86   fill (&padding_float.v, sizeof (padding_float.v));
  87   fill (&padding_float.p2, sizeof (padding));
  88
  89   fill (&padding_double.p1, sizeof (padding));
  90   fill (&padding_double.v, sizeof (padding_double.v));
  91   fill (&padding_double.p2, sizeof (padding));
  92
  93   fill (&padding_long_double.p1, sizeof (padding));
  94   fill (&padding_long_double.v, sizeof (padding_long_double.v));
  95   fill (&padding_long_double.p2, sizeof (padding));
  96 }
  97
  98 int
  99 main ()
 100 {
 101   fill_structs ();
 102
 103   printf ("sizeof (char) == %d\n", sizeof (char));
 104   printf ("sizeof (short) == %d\n", sizeof (short));
 105   printf ("sizeof (int) == %d\n", sizeof (int));
 106   printf ("sizeof (long) == %d\n", sizeof (long));
 107   printf ("sizeof (long long) == %d\n", sizeof (long long));
 108
 109   printf ("sizeof (void *) == %d\n", sizeof (void*));
 110   printf ("sizeof (void (*)(void)) == %d\n", sizeof (void (*)(void)));
 111
 112   printf ("sizeof (float) == %d\n", sizeof (float));
 113   printf ("sizeof (double) == %d\n", sizeof (double));
 114   printf ("sizeof (long double) == %d\n", sizeof (long double));
 115
 116   /* Signed char?  */
 117   printf ("valueof ('\\377') == %d\n", '\377');
 118   printf ("valueof ((int) (char) -1) == %d\n", (int) (char) -1);
 119   printf ("valueof ((int) (signed char) -1) == %d\n", (int) (signed char) -1);
 120   printf ("valueof ((int) (unsigned char) -1) == %d\n", (int) (unsigned char) -1);
 121
 122   return 0;
 123 }