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 #ifdef HAVE_LONGLONG
  36 typedef long long  longlong;
  37 typedef unsigned long long  ulonglong;
  38 #endif
  39 typedef int (function)();
  40
  41 static int random_table[256] = /* 2048 zufällige Bits, hier von pi */
  42   { 0xC9,0x0F,0xDA,0xA2,0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,
  43     0x80,0xDC,0x1C,0xD1,0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,
  44     0x02,0x0B,0xBE,0xA6,0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,
  45     0x8E,0x34,0x04,0xDD,0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,
  46     0x30,0x2B,0x0A,0x6D,0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,
  47     0x6D,0x51,0xC2,0x45,0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,
  48     0xF4,0x4C,0x42,0xE9,0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,
  49     0xF4,0x06,0xB7,0xED,0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,
  50     0xAE,0x9F,0x24,0x11,0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,
  51     0xEC,0xE4,0x5B,0x3D,0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,
  52     0x98,0xDA,0x48,0x36,0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,
  53     0xFD,0x24,0xCF,0x5F,0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,
  54     0x1C,0x62,0xF3,0x56,0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,
  55     0x70,0x96,0x96,0x6D,0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,
  56     0xF1,0x74,0x6C,0x08,0xCA,0x18,0x21,0x7C,0x32,0x90,0x5E,0x46,
  57     0x2E,0x36,0xCE,0x3B,0xE3,0x9E,0x77,0x2C,0x18,0x0E,0x86,0x03,
  58     0x9B,0x27,0x83,0xA2,0xEC,0x07,0xA2,0x8F,0xB5,0xC5,0x5D,0xF0,
  59     0x6F,0x4C,0x52,0xC9,0xDE,0x2B,0xCB,0xF6,0x95,0x58,0x17,0x18,
  60     0x39,0x95,0x49,0x7C,0xEA,0x95,0x6A,0xE5,0x15,0xD2,0x26,0x18,
  61     0x98,0xFA,0x05,0x10,0x15,0x72,0x8E,0x5A,0x8A,0xAA,0xC4,0x2D,
  62     0xAD,0x33,0x17,0x0D,0x04,0x50,0x7A,0x33,0xA8,0x55,0x21,0xAB,
  63     0xDF,0x1C,0xBA,0x65,
  64   };
  65 #define random_table_length  (8*256)
  66 static int random_position = -1;
  67 int next_random_bit(void)
  68   { random_position++;
  69     if (random_position==random_table_length) random_position = 0;
  70     return (random_table[random_position/8] >> (random_position % 8)) & 1;
  71   }
  72
  73 void printf_underscored (const char* string)
  74   { char c;
  75     while (!((c = *string++) == '\0')) { printf("%c",(c==' ' ? '_' : c)); }
  76   }
  77
  78 /* string_length(string) is the same as strlen(string). */
  79 /* Better avoid to depend on <string.h>. */
  80 int string_length (char* string)
  81   { int count = 0;
  82     while (!(*string++ == '\0')) { count++; }
  83     return count;
  84   }
  85
  86 static int char_bitsize, short_bitsize, int_bitsize, long_bitsize;
  87 static int uchar_bitsize, ushort_bitsize, uint_bitsize, ulong_bitsize;
  88 static boolean char_uchar_same, short_ushort_same, int_uint_same, long_ulong_same;
  89 static int pointer_bitsize;
  90 #ifdef HAVE_LONGLONG
  91 static int longlong_bitsize, ulonglong_bitsize;
  92 static boolean longlong_ulonglong_same;
  93 #endif
  94
  95 void main1(void) {
  96 #define get_unsigned_integer_bitsize(type,where)  \
  97   { type x = 1;                               \
  98     int bits = 0;                             \
  99     loop {                                    \
 100       if (x==0) break;                        \
 101       x = x+x;                                \
 102       bits++;                                 \
 103       if (bits==1000) { bits = -1; break; }   \
 104     }                                         \
 105     where = bits;                             \
 106   }
 107 #define get_signed_integer_bitsize(type,unsigned_type,where)  \
 108   { /* Signed integer overflow is "undefined behaviour" in C99, and gcc-4.3    \
 109        (without -fwrapv option) actually does weird things when signed integer \
 110        overflow occurs. Therefore perform the addition on the unsigned type.   \
 111        Drawback: This will not detect cases where the signed type has more bits\
 112        than the unsigned type but the same size according to sizeof. Blech. */ \
 113     type x = 1;                               \
 114     int bits = 0;                             \
 115     loop {                                    \
 116       if (x==0) break;                        \
 117       x = (unsigned_type)x + (unsigned_type)x;\
 118       bits++;                                 \
 119       if (bits==1000) { bits = -1; break; }   \
 120     }                                         \
 121     where = bits;                             \
 122   }
 123 #define print_integer_bitsize(type,typestr,where)  \
 124   { if (where >= 0)                                                  \
 125       { printf("/* Integers of type %s have %ld bits. */\n",typestr,(long)where); \
 126         if (!(typestr[0] == 'u'))                                    \
 127           { printf("#define "); printf_underscored(typestr); printf("_bitsize %ld\n",(long)where); } \
 128         printf("\n");                                                \
 129       }                                                              \
 130       else                                                           \
 131       { printf("#error \"Integers of type %s have no binary representation!!\"\n",typestr); } \
 132     if (!(where == char_bitsize * sizeof(type)))                     \
 133       { printf("#error \"Formula BITSIZE(T) = SIZEOF(T) * BITSPERBYTE does not hold for type %s!!\"\n",typestr); } \
 134   }
 135   get_signed_integer_bitsize(schar,uchar,char_bitsize);
 136   get_signed_integer_bitsize(short,ushort,short_bitsize);
 137   get_signed_integer_bitsize(int,uint,int_bitsize);
 138   get_signed_integer_bitsize(long,ulong,long_bitsize);
 139   print_integer_bitsize(schar,"char",char_bitsize);
 140   print_integer_bitsize(short,"short",short_bitsize);
 141   print_integer_bitsize(int,"int",int_bitsize);
 142   print_integer_bitsize(long,"long",long_bitsize);
 143 #ifdef HAVE_LONGLONG
 144   get_signed_integer_bitsize(longlong,ulonglong,longlong_bitsize);
 145   print_integer_bitsize(longlong,"long long",longlong_bitsize);
 146 #endif
 147   get_unsigned_integer_bitsize(uchar,uchar_bitsize);
 148   get_unsigned_integer_bitsize(ushort,ushort_bitsize);
 149   get_unsigned_integer_bitsize(uint,uint_bitsize);
 150   get_unsigned_integer_bitsize(ulong,ulong_bitsize);
 151   print_integer_bitsize(uchar,"unsigned char",uchar_bitsize);
 152   print_integer_bitsize(ushort,"unsigned short",ushort_bitsize);
 153   print_integer_bitsize(uint,"unsigned int",uint_bitsize);
 154   print_integer_bitsize(ulong,"unsigned long",ulong_bitsize);
 155 #ifdef HAVE_LONGLONG
 156   get_unsigned_integer_bitsize(ulonglong,ulonglong_bitsize);
 157   print_integer_bitsize(ulonglong,"unsigned long long",ulonglong_bitsize);
 158 #endif
 159 }
 160
 161 void main2(void) {
 162 #define compare_integer_bitsizes(typestr1,typestr2,type1_bitsize,type2_bitsize)  \
 163   { if (!(type1_bitsize==type2_bitsize))                                                       \
 164       printf("#error \"Integer types %s and %s have different sizes!!\"\n",typestr1,typestr2); \
 165   }
 166   compare_integer_bitsizes("char","unsigned char",char_bitsize,uchar_bitsize);
 167   compare_integer_bitsizes("short","unsigned short",short_bitsize,ushort_bitsize);
 168   compare_integer_bitsizes("int","unsigned int",int_bitsize,uint_bitsize);
 169   compare_integer_bitsizes("long","unsigned long",long_bitsize,ulong_bitsize);
 170 #ifdef HAVE_LONGLONG
 171   compare_integer_bitsizes("long long","unsigned long long",longlong_bitsize,ulonglong_bitsize);
 172 #endif
 173 }
 174
 175 #define get_a_random(type,bitsize,where)  \
 176   { type x = 0;                                          \
 177     int i = bitsize;                                     \
 178     while (i>0) { x = (x<<1) + next_random_bit(); i--; } \
 179     where = x;                                           \
 180   }
 181 #define get_a_random_twice(type1,type2,bitsize,where1,where2)  \
 182   { type1 x1 = 0; type2 x2 = 0;                 \
 183     int i = bitsize;                            \
 184     while (i>0)                                 \
 185       { type1 b = next_random_bit();            \
 186         x1 = ((x1<<1) + b); x2 = ((x2<<1) + b); \
 187         i--;                                    \
 188       }                                         \
 189     where1 = x1; where2 = x2;                   \
 190   }
 191
 192 void main3(void) {
 193 #define compare_integer_representation(type1,type2,typestr1,typestr2,type1_bitsize,type2_bitsize,where)  \
 194   { if ((type1_bitsize>=0) && (type2_bitsize>=0) && (type1_bitsize==type2_bitsize))           \
 195       { int i,j;                                                                              \
 196         type1 sample1; type2 sample2;                                                         \
 197         where = TRUE;                                                                         \
 198         for (i = 0; i<100; i++)                                                               \
 199           { get_a_random_twice(type1,type2,type1_bitsize,sample1,sample2);                    \
 200             if (!(sample1 == (type1)(sample2))) { where = FALSE; }                            \
 201             if (!(sample2 == (type2)(sample1))) { where = FALSE; }                            \
 202           }                                                                                   \
 203         for (i = 0; i<100; i++)                                                               \
 204           { get_a_random(type1,type1_bitsize,sample1);                                        \
 205             sample2 = (type2)(sample1);                                                       \
 206             for (j = 0; j < type1_bitsize; j++)                                               \
 207               if (!( ((sample1 & ((type1)1<<j)) == 0)                                         \
 208                      == ((sample2 & ((type2)1<<j)) == 0)                                      \
 209                  ) )                                                                          \
 210                 { where = FALSE; }                                                            \
 211           }                                                                                   \
 212         if (where)                                                                            \
 213           { printf("/* Integer types %s and %s have the same binary representation. */\n",typestr1,typestr2); } \
 214           else                                                                                \
 215           { printf("#error \"Integer types %s and %s have different binary representations!!\"\n",typestr1,typestr2); } \
 216       }                                                                                       \
 217       else                                                                                    \
 218       { where = FALSE; }                                                                      \
 219   }
 220   compare_integer_representation(schar,uchar,"char","unsigned char",char_bitsize,uchar_bitsize,char_uchar_same);
 221   compare_integer_representation(short,ushort,"short","unsigned short",short_bitsize,ushort_bitsize,short_ushort_same);
 222   compare_integer_representation(int,uint,"int","unsigned int",int_bitsize,uint_bitsize,int_uint_same);
 223   compare_integer_representation(long,ulong,"long","unsigned long",long_bitsize,ulong_bitsize,long_ulong_same);
 224 #ifdef HAVE_LONGLONG
 225   compare_integer_representation(longlong,ulonglong,"long long","unsigned long long",longlong_bitsize,ulonglong_bitsize,longlong_ulonglong_same);
 226 #endif
 227   printf("\n");
 228 }
 229
 230 void main4(void) {
 231 #define test_integer_ushift(type,typestr,type_bitsize)  \
 232   if (type_bitsize >= 0)                                                                        \
 233     { int i,j,shc;                                                                              \
 234       type sample1,sample2;                                                                     \
 235       boolean left_works = TRUE, right_works = TRUE;                                            \
 236       for (i = 0; i<100; i++)                                                                   \
 237         { get_a_random(type,type_bitsize,sample1);                                              \
 238           for (shc = 0; shc < type_bitsize; shc++)                                              \
 239             { sample2 = sample1 << shc;                                                         \
 240               for (j=0; j < type_bitsize; j++)                                                  \
 241                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                        \
 242                          ==                                                                     \
 243                          (j < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0))               \
 244                      ) )                                                                        \
 245                     { left_works = FALSE; }                                                     \
 246         }   }   }                                                                               \
 247       for (i = 0; i<100; i++)                                                                   \
 248         { get_a_random(type,type_bitsize,sample1);                                              \
 249           for (shc = 0; shc < type_bitsize; shc++)                                              \
 250             { sample2 = sample1 >> shc;                                                         \
 251               for (j=0; j < type_bitsize; j++)                                                  \
 252                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                        \
 253                          ==                                                                     \
 254                          (j >= type_bitsize-shc ? TRUE : ((sample1 & ((type)1<<(j+shc))) == 0)) \
 255                      ) )                                                                        \
 256                     { right_works = FALSE; }                                                    \
 257         }   }   }                                                                               \
 258       if (!left_works)                                                                          \
 259         { printf("#error \"Left shift of integers of type %s does not work!!\"\n",typestr); }   \
 260       if (!right_works)                                                                         \
 261         { printf("#error \"Right shift of integers of type %s does not work!!\"\n",typestr); }  \
 262     }
 263 #define test_integer_sshift(type,typestr,type_bitsize)  \
 264   if (type_bitsize >= 0)                                                                       \
 265     { int i,j,shc;                                                                             \
 266       type sample1,sample2;                                                                    \
 267       boolean left_works = TRUE, right_works = TRUE;                                           \
 268       for (i = 0; i<100; i++)                                                                  \
 269         { get_a_random(type,type_bitsize,sample1);                                             \
 270           for (shc = 0; shc < type_bitsize; shc++)                                             \
 271             { sample2 = sample1 << shc;                                                        \
 272               for (j=0; j < type_bitsize; j++)                                                 \
 273                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                       \
 274                          ==                                                                    \
 275                          (j < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0))              \
 276                      ) )                                                                       \
 277                     { left_works = FALSE; }                                                    \
 278         }   }   }                                                                              \
 279       for (i = 0; i<100; i++)                                                                  \
 280         { get_a_random(type,type_bitsize,sample1);                                             \
 281           for (shc = 0; shc < type_bitsize; shc++)                                             \
 282             { sample2 = sample1 >> shc;                                                        \
 283               for (j=0; j < type_bitsize; j++)                                                 \
 284                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                       \
 285                          ==                                                                    \
 286                          ((sample1 & ((type)1<< (j+shc>=type_bitsize ? type_bitsize-1 : j+shc))) == 0) \
 287                      ) )                                                                       \
 288                     { right_works = FALSE; }                                                   \
 289         }   }   }                                                                              \
 290       if (!left_works)                                                                         \
 291         { printf("#error \"Left shift of integers of type %s does not work!!\"\n",typestr); }  \
 292       if (!right_works)                                                                        \
 293         { printf("#error \"Right shift of integers of type %s does not work!!\"\n",typestr); } \
 294     }
 295   test_integer_ushift(uchar,"unsigned char",uchar_bitsize);
 296   test_integer_ushift(ushort,"unsigned short",ushort_bitsize);
 297   test_integer_ushift(uint,"unsigned int",uint_bitsize);
 298   test_integer_ushift(ulong,"unsigned long",ulong_bitsize);
 299 #ifdef HAVE_LONGLONG
 300   test_integer_ushift(ulonglong,"unsigned long long",ulonglong_bitsize);
 301 #endif
 302   test_integer_sshift(schar,"char",char_bitsize);
 303   test_integer_sshift(short,"short",short_bitsize);
 304   test_integer_sshift(int,"int",int_bitsize);
 305   test_integer_sshift(long,"long",long_bitsize);
 306 #ifdef HAVE_LONGLONG
 307   test_integer_sshift(longlong,"long long",longlong_bitsize);
 308 #endif
 309 }
 310
 311 void main5(void) {
 312 #define test_integer_casts(type1,type2,typestr1,typestr2,type1_bitsize,type2_bitsize,want)  \
 313   if (type1_bitsize <= type2_bitsize)                                                                      \
 314     { int i,j;                                                                                             \
 315       boolean modifies = FALSE;                                                                            \
 316       boolean zero_extends = TRUE;                                                                         \
 317       boolean sign_extends = TRUE;                                                                         \
 318       for (i = 0; i<100; i++)                                                                              \
 319         { type1 sample1;                                                                                   \
 320           type2 sample2;                                                                                   \
 321           get_a_random(type1,type1_bitsize,sample1);                                                       \
 322           sample2 = (type2)sample1;                                                                        \
 323           if (!(sample1 == (type1)sample2)) { modifies = TRUE; }                                           \
 324           for (j = 0; j<type1_bitsize; j++)                                                                \
 325             if (!( ((sample1 & ((type1)1<<j)) == 0) == ((sample2 & ((type2)1<<j)) == 0) ))                 \
 326               { zero_extends = FALSE; sign_extends = FALSE; }                                              \
 327           for (j = type1_bitsize; j<type2_bitsize; j++)                                                    \
 328             if (!((sample2 & ((type2)1<<j)) == 0))                                                         \
 329               { zero_extends = FALSE; }                                                                    \
 330           for (j = type1_bitsize; j<type2_bitsize; j++)                                                    \
 331             if (!( ((sample1 & ((type1)1<<(type1_bitsize-1))) == 0) == ((sample2 & ((type2)1<<j)) == 0) )) \
 332               { sign_extends = FALSE; }                                                                    \
 333         }                                                                                                  \
 334       if (modifies)                                                                                        \
 335         printf("#error \"Casts: (%s)(%s)(x) == x does not hold for every %s x !!\"\n",typestr1,typestr2,typestr1); \
 336       if (zero_extends && sign_extends)                                                                    \
 337         { if (!(type1_bitsize == type2_bitsize))                                                           \
 338             printf("#error \"Casts from %s to %s works by identity!!\"\n",typestr1,typestr2);              \
 339         }                                                                                                  \
 340       if (zero_extends && !sign_extends)                                                                   \
 341         { if ((type1_bitsize == type2_bitsize) || !(typestr1[0] == 'u') || !(want==1))                     \
 342             printf("#error \"Casts from %s to %s works by zero-extend!!\"\n",typestr1,typestr2);           \
 343         }                                                                                                  \
 344       if (sign_extends && !zero_extends)                                                                   \
 345         { if ((type1_bitsize == type2_bitsize) || (typestr1[0] == 'u') || !(want==2))                      \
 346             printf("#error \"Casts from %s to %s works by sign-extend!!\"\n",typestr1,typestr2);           \
 347         }                                                                                                  \
 348       if (!sign_extends && !zero_extends)                                                                  \
 349         printf("#error \"Casts from %s to %s works in an unknown manner!!\"\n",typestr1,typestr2);         \
 350     }
 351   /* erst Casts zwischen Integers vermutlich gleicher Größe: */
 352   test_integer_casts(schar,uchar,"char","unsigned char",char_bitsize,uchar_bitsize,0);
 353   test_integer_casts(short,ushort,"short","unsigned short",short_bitsize,ushort_bitsize,0);
 354   test_integer_casts(int,uint,"int","unsigned int",int_bitsize,uint_bitsize,0);
 355   test_integer_casts(long,ulong,"long","unsigned long",long_bitsize,ulong_bitsize,0);
 356   test_integer_casts(uchar,schar,"unsigned char","char",uchar_bitsize,char_bitsize,0);
 357   test_integer_casts(ushort,short,"unsigned short","short",ushort_bitsize,short_bitsize,0);
 358   test_integer_casts(uint,int,"unsigned int","int",uint_bitsize,int_bitsize,0);
 359   test_integer_casts(ulong,long,"unsigned long","long",ulong_bitsize,long_bitsize,0);
 360 #ifdef HAVE_LONGLONG
 361   test_integer_casts(longlong,ulonglong,"long long","unsigned long long",longlong_bitsize,ulonglong_bitsize,0);
 362   test_integer_casts(ulonglong,longlong,"unsigned long long","long long",ulonglong_bitsize,longlong_bitsize,0);
 363 #endif
 364   /* dann Casts zwischen Integers unterschiedlicher Größe, aber gleichen Vorzeichens: */
 365   test_integer_casts(uchar,ushort,"unsigned char","unsigned short",uchar_bitsize,ushort_bitsize,1);
 366   test_integer_casts(uchar,uint,"unsigned char","unsigned int",uchar_bitsize,uint_bitsize,1);
 367   test_integer_casts(uchar,ulong,"unsigned char","unsigned long",uchar_bitsize,ulong_bitsize,1);
 368   test_integer_casts(ushort,uint,"unsigned short","unsigned int",ushort_bitsize,uint_bitsize,1);
 369   test_integer_casts(ushort,ulong,"unsigned short","unsigned long",ushort_bitsize,ulong_bitsize,1);
 370   test_integer_casts(uint,ulong,"unsigned int","unsigned long",uint_bitsize,ulong_bitsize,1);
 371 #ifdef HAVE_LONGLONG
 372   test_integer_casts(uchar,ulonglong,"unsigned char","unsigned long long",uchar_bitsize,ulonglong_bitsize,1);
 373   test_integer_casts(ushort,ulonglong,"unsigned short","unsigned long long",ushort_bitsize,ulonglong_bitsize,1);
 374   test_integer_casts(uint,ulonglong,"unsigned int","unsigned long long",uint_bitsize,ulonglong_bitsize,1);
 375   test_integer_casts(ulong,ulonglong,"unsigned long","unsigned long long",ulong_bitsize,ulonglong_bitsize,1);
 376 #endif
 377   test_integer_casts(schar,short,"char","short",char_bitsize,short_bitsize,2);
 378   test_integer_casts(schar,int,"char","int",char_bitsize,int_bitsize,2);
 379   test_integer_casts(schar,long,"char","long",char_bitsize,long_bitsize,2);
 380   test_integer_casts(short,int,"short","int",short_bitsize,int_bitsize,2);
 381   test_integer_casts(short,long,"short","long",short_bitsize,long_bitsize,2);
 382   test_integer_casts(int,long,"int","long",int_bitsize,long_bitsize,2);
 383 #ifdef HAVE_LONGLONG
 384   test_integer_casts(schar,longlong,"char","long long",char_bitsize,longlong_bitsize,2);
 385   test_integer_casts(short,longlong,"short","long long",short_bitsize,longlong_bitsize,2);
 386   test_integer_casts(int,longlong,"int","long long",int_bitsize,longlong_bitsize,2);
 387   test_integer_casts(long,longlong,"long","long long",long_bitsize,longlong_bitsize,2);
 388 #endif
 389   /* dann Casts zwischen Integers unterschiedlicher Größe und unterschiedlichen Vorzeichens: */
 390   test_integer_casts(uchar,short,"unsigned char","short",uchar_bitsize,short_bitsize,1);
 391   test_integer_casts(uchar,int,"unsigned char","int",uchar_bitsize,int_bitsize,1);
 392   test_integer_casts(uchar,long,"unsigned char","long",uchar_bitsize,long_bitsize,1);
 393   test_integer_casts(ushort,int,"unsigned short","int",ushort_bitsize,int_bitsize,1);
 394   test_integer_casts(ushort,long,"unsigned short","long",ushort_bitsize,long_bitsize,1);
 395   test_integer_casts(uint,long,"unsigned int","long",uint_bitsize,long_bitsize,1);
 396 #ifdef HAVE_LONGLONG
 397   test_integer_casts(uchar,longlong,"unsigned char","long long",uchar_bitsize,longlong_bitsize,1);
 398   test_integer_casts(ushort,longlong,"unsigned short","long long",ushort_bitsize,longlong_bitsize,1);
 399   test_integer_casts(uint,longlong,"unsigned int","long long",uint_bitsize,longlong_bitsize,1);
 400   test_integer_casts(ulong,longlong,"unsigned long","long long",ulong_bitsize,longlong_bitsize,1);
 401 #endif
 402   test_integer_casts(schar,ushort,"char","unsigned short",char_bitsize,ushort_bitsize,2);
 403   test_integer_casts(schar,uint,"char","unsigned int",char_bitsize,uint_bitsize,2);
 404   test_integer_casts(schar,ulong,"char","unsigned long",char_bitsize,ulong_bitsize,2);
 405   test_integer_casts(short,uint,"short","unsigned int",short_bitsize,uint_bitsize,2);
 406   test_integer_casts(short,ulong,"short","unsigned long",short_bitsize,ulong_bitsize,2);
 407   test_integer_casts(int,ulong,"int","unsigned long",int_bitsize,ulong_bitsize,2);
 408 #ifdef HAVE_LONGLONG
 409   test_integer_casts(schar,ulonglong,"char","unsigned long long",char_bitsize,ulonglong_bitsize,2);
 410   test_integer_casts(short,ulonglong,"short","unsigned long long",short_bitsize,ulonglong_bitsize,2);
 411   test_integer_casts(int,ulonglong,"int","unsigned long long",int_bitsize,ulonglong_bitsize,2);
 412   test_integer_casts(long,ulonglong,"long","unsigned long long",long_bitsize,ulonglong_bitsize,2);
 413 #endif
 414 }
 415
 416 void main6(void) {
 417 #define check_sizeof_pointer(type,typestr)  \
 418   { if (!(sizeof(type) <= sizeof(intptr_t)))                                  \
 419       printf("#error \"Type %s does not fit into an intptr_t!!\"\n",typestr); \
 420   }
 421   check_sizeof_pointer(char*,"char *");
 422   check_sizeof_pointer(long*,"long *");
 423   check_sizeof_pointer(function*,"function *");
 424   pointer_bitsize = char_bitsize * sizeof(char*);
 425   printf("/* Pointers of type %s have %ld bits. */\n","char *",(long)pointer_bitsize);
 426   printf("#define pointer_bitsize %ld\n",(long)pointer_bitsize);
 427   printf("\n");
 428 }
 429
 430 void main7(void) {
 431 #define test_pointer_casts(type1,type2,typestr1,typestr2)  \
 432   if (!(sizeof(type1) == sizeof(type2)))                                                               \
 433     { printf("#error \"Pointer types %s and %s have different sizes!!\"\n",typestr1,typestr2); }       \
 434     else                                                                                               \
 435     { int i;                                                                                           \
 436       uintptr_t differences1 = 0, differences2 = 0;                                                    \
 437       for (i = 0; i<100; i++)                                                                          \
 438         { uintptr_t sample;                                                                            \
 439           type1 sample1;                                                                               \
 440           type2 sample2;                                                                               \
 441           get_a_random(uintptr_t,pointer_bitsize,sample);                                              \
 442           sample1 = (type1)sample;                                                                     \
 443           sample2 = (type2)sample;                                                                     \
 444           differences1 |= ((uintptr_t)sample1 ^ (uintptr_t)(type1)(sample2));                          \
 445           differences2 |= ((uintptr_t)sample2 ^ (uintptr_t)(type2)(sample1));                          \
 446         }                                                                                              \
 447       if (differences1==0)                                                                             \
 448         printf("/* Casts from %s to %s is OK (does nothing). */\n",typestr2,typestr1);                 \
 449       else                                                                                             \
 450       if (differences1 == ~(uintptr_t)0)                                                               \
 451         printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr2,typestr1);         \
 452       else                                                                                             \
 453         printf("#error \"Casts from %s to %s modify part 0x%8lX of pointer!!\"\n",typestr2,typestr1,differences1); \
 454       if (differences2==0)                                                                             \
 455         printf("/* Casts from %s to %s is OK (does nothing). */\n",typestr1,typestr2);                 \
 456       else                                                                                             \
 457       if (differences2 == ~(uintptr_t)0)                                                               \
 458         printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr1,typestr2);         \
 459       else                                                                                             \
 460         printf("#error \"Casts from %s to %s modify part 0x%8lX of pointer!!\"\n",typestr1,typestr2,differences2); \
 461     }
 462   test_pointer_casts(char*,long*,"char *","long *");
 463   test_pointer_casts(char*,function*,"char *","function *");
 464   printf("\n");
 465 }
 466
 467 void main8(void) {
 468 /* The following macro works only in C, not in C++, because C++ restricts the
 469    use of NULL pointers and also because C++ forbids defining types within a
 470    cast. */
 471 #define alignmentof(type)  \
 472   (int)(&((struct { char dummy1; type dummy2; } *)0)->dummy2)
 473 #define get_alignment(type,typestr)  \
 474   { struct { char dummy1; type dummy2; } dummy;                                                           \
 475     long alignment = (char*)&dummy.dummy2 - (char*)&dummy;                                                \
 476     printf("/* Type %s has sizeof = %ld and alignment = %ld. */\n",typestr,(long)sizeof(type),alignment); \
 477     if (!(typestr[0] == 'u') && !(typestr[string_length(typestr)-1] == '*'))                              \
 478       { printf("#define sizeof_"); printf_underscored(typestr); printf(" %ld\n",(long)sizeof(type));      \
 479         printf("#define alignment_"); printf_underscored(typestr); printf(" %ld\n",alignment);            \
 480       }                                                                                                   \
 481     if (!((alignment & (alignment-1)) == 0))                                                              \
 482       printf("#error \"The alignment %ld of type %s is not a power of two!!\"\n",alignment,typestr);      \
 483     printf("\n");                                                                                         \
 484   }
 485   get_alignment(char,"char"); get_alignment(uchar,"unsigned char");
 486   get_alignment(short,"short"); get_alignment(ushort,"unsigned short");
 487   get_alignment(int,"int"); get_alignment(uint,"unsigned int");
 488   get_alignment(long,"long"); get_alignment(ulong,"unsigned long");
 489 #ifdef HAVE_LONGLONG
 490   get_alignment(longlong,"long long"); get_alignment(ulonglong,"unsigned long long");
 491 #endif
 492   get_alignment(float,"float");
 493   get_alignment(double,"double");
 494   get_alignment(char*,"char *");
 495   get_alignment(long*,"long *");
 496   get_alignment(function*,"function *");
 497 }
 498
 499 void main9(void) {
 500 #define get_endian(type,typestr,type_bitsize)  \
 501   { if (type_bitsize == uchar_bitsize * sizeof(type))                                            \
 502       { union { uchar einzeln[sizeof(type)]; type gesamt; } x;                              \
 503         int i,j;                                                                                 \
 504         boolean big_endian = TRUE;                                                               \
 505         boolean little_endian = TRUE;                                                            \
 506         for (i = 0; i<100; i++)                                                                  \
 507           { type sample;                                                                         \
 508             get_a_random(type,type_bitsize,sample);                                              \
 509             x.gesamt = sample;                                                                   \
 510             for (j = 0; j<sizeof(type); j++, sample >>= uchar_bitsize)                           \
 511               { if (!( (sample & (((type)1<<uchar_bitsize)-1)) == x.einzeln[j] ))                \
 512                   { little_endian = FALSE; }                                                     \
 513                 if (!( (sample & (((type)1<<uchar_bitsize)-1)) == x.einzeln[sizeof(type)-1-j] )) \
 514                   { big_endian = FALSE; }                                                        \
 515           }   }                                                                                  \
 516         if (big_endian && little_endian)                                                         \
 517           { if (!(sizeof(type) == 1))                                                            \
 518               printf("#error \"Endianness of type %s in memory doesn't matter.\"\n",typestr); }  \
 519         if (big_endian && !little_endian)                                                        \
 520           { printf("/* Type %s is stored BIG-ENDIAN in memory (i.e. like mc68000 or sparc). */\n",typestr); \
 521             printf("#define "); printf_underscored(&typestr[9]); printf("_big_endian\n");        \
 522           }                                                                                      \
 523         if (little_endian && !big_endian)                                                        \
 524           { printf("/* Type %s is stored LITTLE-ENDIAN in memory (i.e. like Z80 or VAX). */\n",typestr); \
 525             printf("#define "); printf_underscored(&typestr[9]); printf("_little_endian\n");     \
 526           }                                                                                      \
 527         if (!big_endian && !little_endian)                                                       \
 528           { printf("#error \"Type %s is stored in memory in an obscure manner!!\"\n",typestr); } \
 529       }                                                                                          \
 530       else                                                                                       \
 531       { printf("#error \"Endianness makes no sense for type %s !!\"\n",typestr); }               \
 532   }
 533   get_endian(uchar,"unsigned char",uchar_bitsize);
 534   get_endian(ushort,"unsigned short",ushort_bitsize);
 535   get_endian(uint,"unsigned int",uint_bitsize);
 536   get_endian(ulong,"unsigned long",ulong_bitsize);
 537 #ifdef HAVE_LONGLONG
 538   get_endian(ulonglong,"unsigned long long",ulonglong_bitsize);
 539 #endif
 540   printf("\n");
 541 }
 542
 543 long get_stack_direction(void)
 544   { char dummy;
 545     static char* dummyaddr = (char*)0;
 546     if (!(dummyaddr == (char*)0))
 547       { return (&dummy) - dummyaddr; }
 548     else
 549       { dummyaddr = &dummy;
 550         { long result = get_stack_direction();
 551           /* The next assignment avoids tail recursion elimination (IRIX 6.4 CC). */
 552           dummyaddr = (char*)0;
 553           return result;
 554       } }
 555   }
 556
 557 void main10(void)
 558   { long stack_direction = get_stack_direction();
 559     if (stack_direction > 0)
 560       { printf("/* Stack grows up, ca. %ld bytes per function call. */\n",(long)stack_direction);
 561         printf("#define stack_grows_up\n");
 562       }
 563     else if (stack_direction < 0)
 564       { printf("/* Stack grows down, ca. %ld bytes per function call. */\n",-(long)stack_direction);
 565         printf("#define stack_grows_down\n");
 566       }
 567     else
 568       printf("#error \"Unknown stack model -- incorrect C semantics!!\"\n");
 569   }
 570
 571 int main()
 572 { main1();
 573   main2();
 574   main3();
 575   main4();
 576   main5();
 577   main6();
 578   main7();
 579   main8();
 580   main9();
 581   main10();
 582   if (ferror(stdout) || fclose(stdout)) return 1;
 583   return 0;
 584 }