autoconf/intparam.c

   1 /* Bestimmung einiger Maschinen-Parameter und -Abhängigkeiten */
   2 /* und Ausgabe in ein Include-File */
   3 /* Bruno Haible 10.9.1991, 12.10.1992, 6.12.1992, 24.10.1993 */
   4
   5 /* Auf einigen Systemen werden in <sys/types.h> die Typen uchar, ushort, uint, */
   6 /* ulong definiert. Normalerweise reicht _POSIX_SOURCE aus, dies zu verhindern, */
   7 /* bei AIX 3.2.5 (rs6000-ibm-aix3.2.5) jedoch nicht. Wir müssen Gewalt anwenden. */
   8 #define _POSIX_SOURCE
   9 #define uchar  os_uchar
  10 #define ushort os_ushort
  11 #define uint   os_uint
  12 #define ulong  os_ulong
  13 #include <stdint.h>
  14 #include <stdio.h>
  15 #undef ulong
  16 #undef uint
  17 #undef ushort
  18 #undef uchar
  19
  20 #define loop  while(1)
  21
  22 typedef int boolean;
  23 #define TRUE  1
  24 #define FALSE 0
  25
  26 #ifdef __CHAR_UNSIGNED__
  27 typedef signed char  schar;
  28 #else
  29 typedef char  schar;
  30 #endif
  31 typedef unsigned char  uchar;
  32 typedef unsigned short  ushort;
  33 typedef unsigned /* int */  uint;
  34 typedef unsigned long  ulong;
  35 typedef long long  longlong;
  36 typedef unsigned long long  ulonglong;
  37 typedef int (function)();
  38
  39 static int random_table[256] = /* 2048 zufällige Bits, hier von pi */
  40   { 0xC9,0x0F,0xDA,0xA2,0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,
  41     0x80,0xDC,0x1C,0xD1,0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,
  42     0x02,0x0B,0xBE,0xA6,0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,
  43     0x8E,0x34,0x04,0xDD,0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,
  44     0x30,0x2B,0x0A,0x6D,0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,
  45     0x6D,0x51,0xC2,0x45,0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,
  46     0xF4,0x4C,0x42,0xE9,0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,
  47     0xF4,0x06,0xB7,0xED,0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,
  48     0xAE,0x9F,0x24,0x11,0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,
  49     0xEC,0xE4,0x5B,0x3D,0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,
  50     0x98,0xDA,0x48,0x36,0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,
  51     0xFD,0x24,0xCF,0x5F,0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,
  52     0x1C,0x62,0xF3,0x56,0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,
  53     0x70,0x96,0x96,0x6D,0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,
  54     0xF1,0x74,0x6C,0x08,0xCA,0x18,0x21,0x7C,0x32,0x90,0x5E,0x46,
  55     0x2E,0x36,0xCE,0x3B,0xE3,0x9E,0x77,0x2C,0x18,0x0E,0x86,0x03,
  56     0x9B,0x27,0x83,0xA2,0xEC,0x07,0xA2,0x8F,0xB5,0xC5,0x5D,0xF0,
  57     0x6F,0x4C,0x52,0xC9,0xDE,0x2B,0xCB,0xF6,0x95,0x58,0x17,0x18,
  58     0x39,0x95,0x49,0x7C,0xEA,0x95,0x6A,0xE5,0x15,0xD2,0x26,0x18,
  59     0x98,0xFA,0x05,0x10,0x15,0x72,0x8E,0x5A,0x8A,0xAA,0xC4,0x2D,
  60     0xAD,0x33,0x17,0x0D,0x04,0x50,0x7A,0x33,0xA8,0x55,0x21,0xAB,
  61     0xDF,0x1C,0xBA,0x65,
  62   };
  63 #define random_table_length  (8*256)
  64 static int random_position = -1;
  65 int next_random_bit(void)
  66   { random_position++;
  67     if (random_position==random_table_length) random_position = 0;
  68     return (random_table[random_position/8] >> (random_position % 8)) & 1;
  69   }
  70
  71 void printf_underscored (const char* string)
  72   { char c;
  73     while (!((c = *string++) == '\0')) { printf("%c",(c==' ' ? '_' : c)); }
  74   }
  75
  76 /* string_length(string) is the same as strlen(string). */
  77 /* Better avoid to depend on <string.h>. */
  78 int string_length (char* string)
  79   { int count = 0;
  80     while (!(*string++ == '\0')) { count++; }
  81     return count;
  82   }
  83
  84 static int char_bitsize, short_bitsize, int_bitsize, long_bitsize;
  85 static int uchar_bitsize, ushort_bitsize, uint_bitsize, ulong_bitsize;
  86 static boolean char_uchar_same, short_ushort_same, int_uint_same, long_ulong_same;
  87 static int pointer_bitsize;
  88 static int longlong_bitsize, ulonglong_bitsize;
  89 static boolean longlong_ulonglong_same;
  90
  91 void main1(void) {
  92 #define get_unsigned_integer_bitsize(type,where)  \
  93   { type x = 1;                               \
  94     int bits = 0;                             \
  95     loop {                                    \
  96       if (x==0) break;                        \
  97       x = x+x;                                \
  98       bits++;                                 \
  99       if (bits==1000) { bits = -1; break; }   \
 100     }                                         \
 101     where = bits;                             \
 102   }
 103 #define get_signed_integer_bitsize(type,unsigned_type,where)  \
 104   { /* Signed integer overflow is "undefined behaviour" in C99, and gcc-4.3    \
 105        (without -fwrapv option) actually does weird things when signed integer \
 106        overflow occurs. Therefore perform the addition on the unsigned type.   \
 107        Drawback: This will not detect cases where the signed type has more bits\
 108        than the unsigned type but the same size according to sizeof. Blech. */ \
 109     type x = 1;                               \
 110     int bits = 0;                             \
 111     loop {                                    \
 112       if (x==0) break;                        \
 113       x = (unsigned_type)x + (unsigned_type)x;\
 114       bits++;                                 \
 115       if (bits==1000) { bits = -1; break; }   \
 116     }                                         \
 117     where = bits;                             \
 118   }
 119 #define print_integer_bitsize(type,typestr,where)  \
 120   { if (where >= 0)                                                  \
 121       { printf("/* Integers of type %s have %ld bits. */\n",typestr,(long)where); \
 122         if (!(typestr[0] == 'u'))                                    \
 123           { printf("#define "); printf_underscored(typestr); printf("_bitsize %ld\n",(long)where); } \
 124         printf("\n");                                                \
 125       }                                                              \
 126       else                                                           \
 127       { printf("#error \"Integers of type %s have no binary representation!!\"\n",typestr); } \
 128     if (!(where == char_bitsize * sizeof(type)))                     \
 129       { printf("#error \"Formula BITSIZE(T) = SIZEOF(T) * BITSPERBYTE does not hold for type %s!!\"\n",typestr); } \
 130   }
 131   get_signed_integer_bitsize(schar,uchar,char_bitsize);
 132   get_signed_integer_bitsize(short,ushort,short_bitsize);
 133   get_signed_integer_bitsize(int,uint,int_bitsize);
 134   get_signed_integer_bitsize(long,ulong,long_bitsize);
 135   print_integer_bitsize(schar,"char",char_bitsize);
 136   print_integer_bitsize(short,"short",short_bitsize);
 137   print_integer_bitsize(int,"int",int_bitsize);
 138   print_integer_bitsize(long,"long",long_bitsize);
 139   get_signed_integer_bitsize(longlong,ulonglong,longlong_bitsize);
 140   print_integer_bitsize(longlong,"long long",longlong_bitsize);
 141   get_unsigned_integer_bitsize(uchar,uchar_bitsize);
 142   get_unsigned_integer_bitsize(ushort,ushort_bitsize);
 143   get_unsigned_integer_bitsize(uint,uint_bitsize);
 144   get_unsigned_integer_bitsize(ulong,ulong_bitsize);
 145   print_integer_bitsize(uchar,"unsigned char",uchar_bitsize);
 146   print_integer_bitsize(ushort,"unsigned short",ushort_bitsize);
 147   print_integer_bitsize(uint,"unsigned int",uint_bitsize);
 148   print_integer_bitsize(ulong,"unsigned long",ulong_bitsize);
 149   get_unsigned_integer_bitsize(ulonglong,ulonglong_bitsize);
 150   print_integer_bitsize(ulonglong,"unsigned long long",ulonglong_bitsize);
 151 }
 152
 153 void main2(void) {
 154 #define compare_integer_bitsizes(typestr1,typestr2,type1_bitsize,type2_bitsize)  \
 155   { if (!(type1_bitsize==type2_bitsize))                                                       \
 156       printf("#error \"Integer types %s and %s have different sizes!!\"\n",typestr1,typestr2); \
 157   }
 158   compare_integer_bitsizes("char","unsigned char",char_bitsize,uchar_bitsize);
 159   compare_integer_bitsizes("short","unsigned short",short_bitsize,ushort_bitsize);
 160   compare_integer_bitsizes("int","unsigned int",int_bitsize,uint_bitsize);
 161   compare_integer_bitsizes("long","unsigned long",long_bitsize,ulong_bitsize);
 162   compare_integer_bitsizes("long long","unsigned long long",longlong_bitsize,ulonglong_bitsize);
 163 }
 164
 165 #define get_a_random(type,bitsize,where)  \
 166   { type x = 0;                                          \
 167     int i = bitsize;                                     \
 168     while (i>0) { x = (x<<1) + next_random_bit(); i--; } \
 169     where = x;                                           \
 170   }
 171 #define get_a_random_twice(type1,type2,bitsize,where1,where2)  \
 172   { type1 x1 = 0; type2 x2 = 0;                 \
 173     int i = bitsize;                            \
 174     while (i>0)                                 \
 175       { type1 b = next_random_bit();            \
 176         x1 = ((x1<<1) + b); x2 = ((x2<<1) + b); \
 177         i--;                                    \
 178       }                                         \
 179     where1 = x1; where2 = x2;                   \
 180   }
 181
 182 void main3(void) {
 183 #define compare_integer_representation(type1,type2,typestr1,typestr2,type1_bitsize,type2_bitsize,where)  \
 184   { if ((type1_bitsize>=0) && (type2_bitsize>=0) && (type1_bitsize==type2_bitsize))           \
 185       { int i,j;                                                                              \
 186         type1 sample1; type2 sample2;                                                         \
 187         where = TRUE;                                                                         \
 188         for (i = 0; i<100; i++)                                                               \
 189           { get_a_random_twice(type1,type2,type1_bitsize,sample1,sample2);                    \
 190             if (!(sample1 == (type1)(sample2))) { where = FALSE; }                            \
 191             if (!(sample2 == (type2)(sample1))) { where = FALSE; }                            \
 192           }                                                                                   \
 193         for (i = 0; i<100; i++)                                                               \
 194           { get_a_random(type1,type1_bitsize,sample1);                                        \
 195             sample2 = (type2)(sample1);                                                       \
 196             for (j = 0; j < type1_bitsize; j++)                                               \
 197               if (!( ((sample1 & ((type1)1<<j)) == 0)                                         \
 198                      == ((sample2 & ((type2)1<<j)) == 0)                                      \
 199                  ) )                                                                          \
 200                 { where = FALSE; }                                                            \
 201           }                                                                                   \
 202         if (where)                                                                            \
 203           { printf("/* Integer types %s and %s have the same binary representation. */\n",typestr1,typestr2); } \
 204           else                                                                                \
 205           { printf("#error \"Integer types %s and %s have different binary representations!!\"\n",typestr1,typestr2); } \
 206       }                                                                                       \
 207       else                                                                                    \
 208       { where = FALSE; }                                                                      \
 209   }
 210   compare_integer_representation(schar,uchar,"char","unsigned char",char_bitsize,uchar_bitsize,char_uchar_same);
 211   compare_integer_representation(short,ushort,"short","unsigned short",short_bitsize,ushort_bitsize,short_ushort_same);
 212   compare_integer_representation(int,uint,"int","unsigned int",int_bitsize,uint_bitsize,int_uint_same);
 213   compare_integer_representation(long,ulong,"long","unsigned long",long_bitsize,ulong_bitsize,long_ulong_same);
 214   compare_integer_representation(longlong,ulonglong,"long long","unsigned long long",longlong_bitsize,ulonglong_bitsize,longlong_ulonglong_same);
 215   printf("\n");
 216 }
 217
 218 void main4(void) {
 219 #define test_integer_ushift(type,typestr,type_bitsize)  \
 220   if (type_bitsize >= 0)                                                                        \
 221     { int i,j,shc;                                                                              \
 222       type sample1,sample2;                                                                     \
 223       boolean left_works = TRUE, right_works = TRUE;                                            \
 224       for (i = 0; i<100; i++)                                                                   \
 225         { get_a_random(type,type_bitsize,sample1);                                              \
 226           for (shc = 0; shc < type_bitsize; shc++)                                              \
 227             { sample2 = sample1 << shc;                                                         \
 228               for (j=0; j < type_bitsize; j++)                                                  \
 229                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                        \
 230                          ==                                                                     \
 231                          (j < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0))               \
 232                      ) )                                                                        \
 233                     { left_works = FALSE; }                                                     \
 234         }   }   }                                                                               \
 235       for (i = 0; i<100; i++)                                                                   \
 236         { get_a_random(type,type_bitsize,sample1);                                              \
 237           for (shc = 0; shc < type_bitsize; shc++)                                              \
 238             { sample2 = sample1 >> shc;                                                         \
 239               for (j=0; j < type_bitsize; j++)                                                  \
 240                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                        \
 241                          ==                                                                     \
 242                          (j >= type_bitsize-shc ? TRUE : ((sample1 & ((type)1<<(j+shc))) == 0)) \
 243                      ) )                                                                        \
 244                     { right_works = FALSE; }                                                    \
 245         }   }   }                                                                               \
 246       if (!left_works)                                                                          \
 247         { printf("#error \"Left shift of integers of type %s does not work!!\"\n",typestr); }   \
 248       if (!right_works)                                                                         \
 249         { printf("#error \"Right shift of integers of type %s does not work!!\"\n",typestr); }  \
 250     }
 251 #define test_integer_sshift(type,typestr,type_bitsize)  \
 252   if (type_bitsize >= 0)                                                                       \
 253     { int i,j,shc;                                                                             \
 254       type sample1,sample2;                                                                    \
 255       boolean left_works = TRUE, right_works = TRUE;                                           \
 256       for (i = 0; i<100; i++)                                                                  \
 257         { get_a_random(type,type_bitsize,sample1);                                             \
 258           for (shc = 0; shc < type_bitsize; shc++)                                             \
 259             { sample2 = sample1 << shc;                                                        \
 260               for (j=0; j < type_bitsize; j++)                                                 \
 261                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                       \
 262                          ==                                                                    \
 263                          (j < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0))              \
 264                      ) )                                                                       \
 265                     { left_works = FALSE; }                                                    \
 266         }   }   }                                                                              \
 267       for (i = 0; i<100; i++)                                                                  \
 268         { get_a_random(type,type_bitsize,sample1);                                             \
 269           for (shc = 0; shc < type_bitsize; shc++)                                             \
 270             { sample2 = sample1 >> shc;                                                        \
 271               for (j=0; j < type_bitsize; j++)                                                 \
 272                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                       \
 273                          ==                                                                    \
 274                          ((sample1 & ((type)1<< (j+shc>=type_bitsize ? type_bitsize-1 : j+shc))) == 0) \
 275                      ) )                                                                       \
 276                     { right_works = FALSE; }                                                   \
 277         }   }   }                                                                              \
 278       if (!left_works)                                                                         \
 279         { printf("#error \"Left shift of integers of type %s does not work!!\"\n",typestr); }  \
 280       if (!right_works)                                                                        \
 281         { printf("#error \"Right shift of integers of type %s does not work!!\"\n",typestr); } \
 282     }
 283   test_integer_ushift(uchar,"unsigned char",uchar_bitsize);
 284   test_integer_ushift(ushort,"unsigned short",ushort_bitsize);
 285   test_integer_ushift(uint,"unsigned int",uint_bitsize);
 286   test_integer_ushift(ulong,"unsigned long",ulong_bitsize);
 287   test_integer_ushift(ulonglong,"unsigned long long",ulonglong_bitsize);
 288   test_integer_sshift(schar,"char",char_bitsize);
 289   test_integer_sshift(short,"short",short_bitsize);
 290   test_integer_sshift(int,"int",int_bitsize);
 291   test_integer_sshift(long,"long",long_bitsize);
 292   test_integer_sshift(longlong,"long long",longlong_bitsize);
 293 }
 294
 295 void main5(void) {
 296 #define test_integer_casts(type1,type2,typestr1,typestr2,type1_bitsize,type2_bitsize,want)  \
 297   if (type1_bitsize <= type2_bitsize)                                                                      \
 298     { int i,j;                                                                                             \
 299       boolean modifies = FALSE;                                                                            \
 300       boolean zero_extends = TRUE;                                                                         \
 301       boolean sign_extends = TRUE;                                                                         \
 302       for (i = 0; i<100; i++)                                                                              \
 303         { type1 sample1;                                                                                   \
 304           type2 sample2;                                                                                   \
 305           get_a_random(type1,type1_bitsize,sample1);                                                       \
 306           sample2 = (type2)sample1;                                                                        \
 307           if (!(sample1 == (type1)sample2)) { modifies = TRUE; }                                           \
 308           for (j = 0; j<type1_bitsize; j++)                                                                \
 309             if (!( ((sample1 & ((type1)1<<j)) == 0) == ((sample2 & ((type2)1<<j)) == 0) ))                 \
 310               { zero_extends = FALSE; sign_extends = FALSE; }                                              \
 311           for (j = type1_bitsize; j<type2_bitsize; j++)                                                    \
 312             if (!((sample2 & ((type2)1<<j)) == 0))                                                         \
 313               { zero_extends = FALSE; }                                                                    \
 314           for (j = type1_bitsize; j<type2_bitsize; j++)                                                    \
 315             if (!( ((sample1 & ((type1)1<<(type1_bitsize-1))) == 0) == ((sample2 & ((type2)1<<j)) == 0) )) \
 316               { sign_extends = FALSE; }                                                                    \
 317         }                                                                                                  \
 318       if (modifies)                                                                                        \
 319         printf("#error \"Casts: (%s)(%s)(x) == x does not hold for every %s x !!\"\n",typestr1,typestr2,typestr1); \
 320       if (zero_extends && sign_extends)                                                                    \
 321         { if (!(type1_bitsize == type2_bitsize))                                                           \
 322             printf("#error \"Casts from %s to %s works by identity!!\"\n",typestr1,typestr2);              \
 323         }                                                                                                  \
 324       if (zero_extends && !sign_extends)                                                                   \
 325         { if ((type1_bitsize == type2_bitsize) || !(typestr1[0] == 'u') || !(want==1))                     \
 326             printf("#error \"Casts from %s to %s works by zero-extend!!\"\n",typestr1,typestr2);           \
 327         }                                                                                                  \
 328       if (sign_extends && !zero_extends)                                                                   \
 329         { if ((type1_bitsize == type2_bitsize) || (typestr1[0] == 'u') || !(want==2))                      \
 330             printf("#error \"Casts from %s to %s works by sign-extend!!\"\n",typestr1,typestr2);           \
 331         }                                                                                                  \
 332       if (!sign_extends && !zero_extends)                                                                  \
 333         printf("#error \"Casts from %s to %s works in an unknown manner!!\"\n",typestr1,typestr2);         \
 334     }
 335   /* erst Casts zwischen Integers vermutlich gleicher Größe: */
 336   test_integer_casts(schar,uchar,"char","unsigned char",char_bitsize,uchar_bitsize,0);
 337   test_integer_casts(short,ushort,"short","unsigned short",short_bitsize,ushort_bitsize,0);
 338   test_integer_casts(int,uint,"int","unsigned int",int_bitsize,uint_bitsize,0);
 339   test_integer_casts(long,ulong,"long","unsigned long",long_bitsize,ulong_bitsize,0);
 340   test_integer_casts(uchar,schar,"unsigned char","char",uchar_bitsize,char_bitsize,0);
 341   test_integer_casts(ushort,short,"unsigned short","short",ushort_bitsize,short_bitsize,0);
 342   test_integer_casts(uint,int,"unsigned int","int",uint_bitsize,int_bitsize,0);
 343   test_integer_casts(ulong,long,"unsigned long","long",ulong_bitsize,long_bitsize,0);
 344   test_integer_casts(longlong,ulonglong,"long long","unsigned long long",longlong_bitsize,ulonglong_bitsize,0);
 345   test_integer_casts(ulonglong,longlong,"unsigned long long","long long",ulonglong_bitsize,longlong_bitsize,0);
 346   /* dann Casts zwischen Integers unterschiedlicher Größe, aber gleichen Vorzeichens: */
 347   test_integer_casts(uchar,ushort,"unsigned char","unsigned short",uchar_bitsize,ushort_bitsize,1);
 348   test_integer_casts(uchar,uint,"unsigned char","unsigned int",uchar_bitsize,uint_bitsize,1);
 349   test_integer_casts(uchar,ulong,"unsigned char","unsigned long",uchar_bitsize,ulong_bitsize,1);
 350   test_integer_casts(ushort,uint,"unsigned short","unsigned int",ushort_bitsize,uint_bitsize,1);
 351   test_integer_casts(ushort,ulong,"unsigned short","unsigned long",ushort_bitsize,ulong_bitsize,1);
 352   test_integer_casts(uint,ulong,"unsigned int","unsigned long",uint_bitsize,ulong_bitsize,1);
 353   test_integer_casts(uchar,ulonglong,"unsigned char","unsigned long long",uchar_bitsize,ulonglong_bitsize,1);
 354   test_integer_casts(ushort,ulonglong,"unsigned short","unsigned long long",ushort_bitsize,ulonglong_bitsize,1);
 355   test_integer_casts(uint,ulonglong,"unsigned int","unsigned long long",uint_bitsize,ulonglong_bitsize,1);
 356   test_integer_casts(ulong,ulonglong,"unsigned long","unsigned long long",ulong_bitsize,ulonglong_bitsize,1);
 357   test_integer_casts(schar,short,"char","short",char_bitsize,short_bitsize,2);
 358   test_integer_casts(schar,int,"char","int",char_bitsize,int_bitsize,2);
 359   test_integer_casts(schar,long,"char","long",char_bitsize,long_bitsize,2);
 360   test_integer_casts(short,int,"short","int",short_bitsize,int_bitsize,2);
 361   test_integer_casts(short,long,"short","long",short_bitsize,long_bitsize,2);
 362   test_integer_casts(int,long,"int","long",int_bitsize,long_bitsize,2);
 363   test_integer_casts(schar,longlong,"char","long long",char_bitsize,longlong_bitsize,2);
 364   test_integer_casts(short,longlong,"short","long long",short_bitsize,longlong_bitsize,2);
 365   test_integer_casts(int,longlong,"int","long long",int_bitsize,longlong_bitsize,2);
 366   test_integer_casts(long,longlong,"long","long long",long_bitsize,longlong_bitsize,2);
 367   /* dann Casts zwischen Integers unterschiedlicher Größe und unterschiedlichen Vorzeichens: */
 368   test_integer_casts(uchar,short,"unsigned char","short",uchar_bitsize,short_bitsize,1);
 369   test_integer_casts(uchar,int,"unsigned char","int",uchar_bitsize,int_bitsize,1);
 370   test_integer_casts(uchar,long,"unsigned char","long",uchar_bitsize,long_bitsize,1);
 371   test_integer_casts(ushort,int,"unsigned short","int",ushort_bitsize,int_bitsize,1);
 372   test_integer_casts(ushort,long,"unsigned short","long",ushort_bitsize,long_bitsize,1);
 373   test_integer_casts(uint,long,"unsigned int","long",uint_bitsize,long_bitsize,1);
 374   test_integer_casts(uchar,longlong,"unsigned char","long long",uchar_bitsize,longlong_bitsize,1);
 375   test_integer_casts(ushort,longlong,"unsigned short","long long",ushort_bitsize,longlong_bitsize,1);
 376   test_integer_casts(uint,longlong,"unsigned int","long long",uint_bitsize,longlong_bitsize,1);
 377   test_integer_casts(ulong,longlong,"unsigned long","long long",ulong_bitsize,longlong_bitsize,1);
 378   test_integer_casts(schar,ushort,"char","unsigned short",char_bitsize,ushort_bitsize,2);
 379   test_integer_casts(schar,uint,"char","unsigned int",char_bitsize,uint_bitsize,2);
 380   test_integer_casts(schar,ulong,"char","unsigned long",char_bitsize,ulong_bitsize,2);
 381   test_integer_casts(short,uint,"short","unsigned int",short_bitsize,uint_bitsize,2);
 382   test_integer_casts(short,ulong,"short","unsigned long",short_bitsize,ulong_bitsize,2);
 383   test_integer_casts(int,ulong,"int","unsigned long",int_bitsize,ulong_bitsize,2);
 384   test_integer_casts(schar,ulonglong,"char","unsigned long long",char_bitsize,ulonglong_bitsize,2);
 385   test_integer_casts(short,ulonglong,"short","unsigned long long",short_bitsize,ulonglong_bitsize,2);
 386   test_integer_casts(int,ulonglong,"int","unsigned long long",int_bitsize,ulonglong_bitsize,2);
 387   test_integer_casts(long,ulonglong,"long","unsigned long long",long_bitsize,ulonglong_bitsize,2);
 388 }
 389
 390 void main6(void) {
 391 #define check_sizeof_pointer(type,typestr)  \
 392   { if (!(sizeof(type) <= sizeof(intptr_t)))                                  \
 393       printf("#error \"Type %s does not fit into an intptr_t!!\"\n",typestr); \
 394   }
 395   check_sizeof_pointer(char*,"char *");
 396   check_sizeof_pointer(long*,"long *");
 397   check_sizeof_pointer(function*,"function *");
 398   pointer_bitsize = char_bitsize * sizeof(char*);
 399   printf("/* Pointers of type %s have %ld bits. */\n","char *",(long)pointer_bitsize);
 400   printf("#define pointer_bitsize %ld\n",(long)pointer_bitsize);
 401   printf("\n");
 402 }
 403
 404 void main7(void) {
 405 #define test_pointer_casts(type1,type2,typestr1,typestr2)  \
 406   if (!(sizeof(type1) == sizeof(type2)))                                                               \
 407     { printf("#error \"Pointer types %s and %s have different sizes!!\"\n",typestr1,typestr2); }       \
 408     else                                                                                               \
 409     { int i;                                                                                           \
 410       uintptr_t differences1 = 0, differences2 = 0;                                                    \
 411       for (i = 0; i<100; i++)                                                                          \
 412         { uintptr_t sample;                                                                            \
 413           type1 sample1;                                                                               \
 414           type2 sample2;                                                                               \
 415           get_a_random(uintptr_t,pointer_bitsize,sample);                                              \
 416           sample1 = (type1)sample;                                                                     \
 417           sample2 = (type2)sample;                                                                     \
 418           differences1 |= ((uintptr_t)sample1 ^ (uintptr_t)(type1)(sample2));                          \
 419           differences2 |= ((uintptr_t)sample2 ^ (uintptr_t)(type2)(sample1));                          \
 420         }                                                                                              \
 421       if (differences1==0)                                                                             \
 422         printf("/* Casts from %s to %s is OK (does nothing). */\n",typestr2,typestr1);                 \
 423       else                                                                                             \
 424       if (differences1 == ~(uintptr_t)0)                                                               \
 425         printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr2,typestr1);         \
 426       else                                                                                             \
 427         printf("#error \"Casts from %s to %s modify part 0x%8lX of pointer!!\"\n",typestr2,typestr1,differences1); \
 428       if (differences2==0)                                                                             \
 429         printf("/* Casts from %s to %s is OK (does nothing). */\n",typestr1,typestr2);                 \
 430       else                                                                                             \
 431       if (differences2 == ~(uintptr_t)0)                                                               \
 432         printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr1,typestr2);         \
 433       else                                                                                             \
 434         printf("#error \"Casts from %s to %s modify part 0x%8lX of pointer!!\"\n",typestr1,typestr2,differences2); \
 435     }
 436   test_pointer_casts(char*,long*,"char *","long *");
 437   test_pointer_casts(char*,function*,"char *","function *");
 438   printf("\n");
 439 }
 440
 441 void main8(void) {
 442 /* The following macro works only in C, not in C++, because C++ restricts the
 443    use of NULL pointers and also because C++ forbids defining types within a
 444    cast. */
 445 #define alignmentof(type)  \
 446   (int)(&((struct { char dummy1; type dummy2; } *)0)->dummy2)
 447 #define get_alignment(type,typestr)  \
 448   { struct { char dummy1; type dummy2; } dummy;                                                           \
 449     long alignment = (char*)&dummy.dummy2 - (char*)&dummy;                                                \
 450     printf("/* Type %s has sizeof = %ld and alignment = %ld. */\n",typestr,(long)sizeof(type),alignment); \
 451     if (!(typestr[0] == 'u') && !(typestr[string_length(typestr)-1] == '*'))                              \
 452       { printf("#define sizeof_"); printf_underscored(typestr); printf(" %ld\n",(long)sizeof(type));      \
 453         printf("#define alignment_"); printf_underscored(typestr); printf(" %ld\n",alignment);            \
 454       }                                                                                                   \
 455     if (!((alignment & (alignment-1)) == 0))                                                              \
 456       printf("#error \"The alignment %ld of type %s is not a power of two!!\"\n",alignment,typestr);      \
 457     printf("\n");                                                                                         \
 458   }
 459   get_alignment(char,"char"); get_alignment(uchar,"unsigned char");
 460   get_alignment(short,"short"); get_alignment(ushort,"unsigned short");
 461   get_alignment(int,"int"); get_alignment(uint,"unsigned int");
 462   get_alignment(long,"long"); get_alignment(ulong,"unsigned long");
 463   get_alignment(longlong,"long long"); get_alignment(ulonglong,"unsigned long long");
 464   get_alignment(float,"float");
 465   get_alignment(double,"double");
 466   get_alignment(char*,"char *");
 467   get_alignment(long*,"long *");
 468   get_alignment(function*,"function *");
 469 }
 470
 471 void main9(void) {
 472 #define get_endian(type,typestr,type_bitsize)  \
 473   { if (type_bitsize == uchar_bitsize * sizeof(type))                                            \
 474       { union { uchar einzeln[sizeof(type)]; type gesamt; } x;                              \
 475         int i,j;                                                                                 \
 476         boolean big_endian = TRUE;                                                               \
 477         boolean little_endian = TRUE;                                                            \
 478         for (i = 0; i<100; i++)                                                                  \
 479           { type sample;                                                                         \
 480             get_a_random(type,type_bitsize,sample);                                              \
 481             x.gesamt = sample;                                                                   \
 482             for (j = 0; j<sizeof(type); j++, sample >>= uchar_bitsize)                           \
 483               { if (!( (sample & (((type)1<<uchar_bitsize)-1)) == x.einzeln[j] ))                \
 484                   { little_endian = FALSE; }                                                     \
 485                 if (!( (sample & (((type)1<<uchar_bitsize)-1)) == x.einzeln[sizeof(type)-1-j] )) \
 486                   { big_endian = FALSE; }                                                        \
 487           }   }                                                                                  \
 488         if (big_endian && little_endian)                                                         \
 489           { if (!(sizeof(type) == 1))                                                            \
 490               printf("#error \"Endianness of type %s in memory doesn't matter.\"\n",typestr); }  \
 491         if (big_endian && !little_endian)                                                        \
 492           { printf("/* Type %s is stored BIG-ENDIAN in memory (i.e. like mc68000 or sparc). */\n",typestr); \
 493             printf("#define "); printf_underscored(&typestr[9]); printf("_big_endian\n");        \
 494           }                                                                                      \
 495         if (little_endian && !big_endian)                                                        \
 496           { printf("/* Type %s is stored LITTLE-ENDIAN in memory (i.e. like Z80 or VAX). */\n",typestr); \
 497             printf("#define "); printf_underscored(&typestr[9]); printf("_little_endian\n");     \
 498           }                                                                                      \
 499         if (!big_endian && !little_endian)                                                       \
 500           { printf("#error \"Type %s is stored in memory in an obscure manner!!\"\n",typestr); } \
 501       }                                                                                          \
 502       else                                                                                       \
 503       { printf("#error \"Endianness makes no sense for type %s !!\"\n",typestr); }               \
 504   }
 505   get_endian(ushort,"unsigned short",ushort_bitsize);
 506   get_endian(uint,"unsigned int",uint_bitsize);
 507   get_endian(ulong,"unsigned long",ulong_bitsize);
 508   get_endian(ulonglong,"unsigned long long",ulonglong_bitsize);
 509   printf("\n");
 510 }
 511
 512 int main(int argc, char *argv[])
 513 { if (freopen(argc==1 ? "conftest.h" : argv[1], "w", stdout) == NULL) return 1;
 514   main1();
 515   main2();
 516   main3();
 517   main4();
 518   main5();
 519   main6();
 520   main7();
 521   main8();
 522   main9();
 523   if (ferror(stdout) || fclose(stdout)) return 1;
 524   return 0;
 525 }