autoconf/intparam.c

   1 #line 1 "intparam.d"
   2 /* Bestimmung einiger Maschinen-Parameter und -Abhängigkeiten */
   3 /* und Ausgabe in ein Include-File */
   4 /* Bruno Haible 10.9.1991, 12.10.1992, 6.12.1992, 24.10.1993 */
   5
   6 /* Auf einigen Systemen werden in <sys/types.h> die Typen uchar, ushort, uint, */
   7 /* ulong definiert. Normalerweise reicht _POSIX_SOURCE aus, dies zu verhindern, */
   8 /* bei AIX 3.2.5 (rs6000-ibm-aix3.2.5) jedoch nicht. Wir müssen Gewalt anwenden. */
   9 #define _POSIX_SOURCE
  10 #define uchar  os_uchar
  11 #define ushort os_ushort
  12 #define uint   os_uint
  13 #define ulong  os_ulong
  14 #include <stdio.h>
  15 #undef ulong
  16 #undef uint
  17 #undef ushort
  18 #undef uchar
  19
  20 #if !(defined(__STDC__) || defined(__cplusplus))
  21 /* Only for use in function parameter lists and as function return type. */
  22 #define void
  23 #endif
  24
  25 #define loop  while(1)
  26
  27 typedef int boolean;
  28 #define TRUE  1
  29 #define FALSE 0
  30
  31 #ifdef __CHAR_UNSIGNED__
  32 typedef signed char  schar;
  33 #else
  34 typedef char  schar;
  35 #endif
  36 typedef unsigned char  uchar;
  37 typedef unsigned short  ushort;
  38 typedef unsigned /* int */  uint;
  39 typedef unsigned long  ulong;
  40 #ifdef HAVE_LONGLONG
  41 typedef long long  longlong;
  42 typedef unsigned long long  ulonglong;
  43 #endif
  44 typedef int (function)();
  45
  46 static int random_table[256] = /* 2048 zufällige Bits, hier von pi */
  47   { 0xC9,0x0F,0xDA,0xA2,0x21,0x68,0xC2,0x34,0xC4,0xC6,0x62,0x8B,
  48     0x80,0xDC,0x1C,0xD1,0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,
  49     0x02,0x0B,0xBE,0xA6,0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,
  50     0x8E,0x34,0x04,0xDD,0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,
  51     0x30,0x2B,0x0A,0x6D,0xF2,0x5F,0x14,0x37,0x4F,0xE1,0x35,0x6D,
  52     0x6D,0x51,0xC2,0x45,0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,
  53     0xF4,0x4C,0x42,0xE9,0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,
  54     0xF4,0x06,0xB7,0xED,0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,
  55     0xAE,0x9F,0x24,0x11,0x7C,0x4B,0x1F,0xE6,0x49,0x28,0x66,0x51,
  56     0xEC,0xE4,0x5B,0x3D,0xC2,0x00,0x7C,0xB8,0xA1,0x63,0xBF,0x05,
  57     0x98,0xDA,0x48,0x36,0x1C,0x55,0xD3,0x9A,0x69,0x16,0x3F,0xA8,
  58     0xFD,0x24,0xCF,0x5F,0x83,0x65,0x5D,0x23,0xDC,0xA3,0xAD,0x96,
  59     0x1C,0x62,0xF3,0x56,0x20,0x85,0x52,0xBB,0x9E,0xD5,0x29,0x07,
  60     0x70,0x96,0x96,0x6D,0x67,0x0C,0x35,0x4E,0x4A,0xBC,0x98,0x04,
  61     0xF1,0x74,0x6C,0x08,0xCA,0x18,0x21,0x7C,0x32,0x90,0x5E,0x46,
  62     0x2E,0x36,0xCE,0x3B,0xE3,0x9E,0x77,0x2C,0x18,0x0E,0x86,0x03,
  63     0x9B,0x27,0x83,0xA2,0xEC,0x07,0xA2,0x8F,0xB5,0xC5,0x5D,0xF0,
  64     0x6F,0x4C,0x52,0xC9,0xDE,0x2B,0xCB,0xF6,0x95,0x58,0x17,0x18,
  65     0x39,0x95,0x49,0x7C,0xEA,0x95,0x6A,0xE5,0x15,0xD2,0x26,0x18,
  66     0x98,0xFA,0x05,0x10,0x15,0x72,0x8E,0x5A,0x8A,0xAA,0xC4,0x2D,
  67     0xAD,0x33,0x17,0x0D,0x04,0x50,0x7A,0x33,0xA8,0x55,0x21,0xAB,
  68     0xDF,0x1C,0xBA,0x65,
  69   };
  70 #define random_table_length  (8*256)
  71 static int random_position = -1;
  72 int next_random_bit(void)
  73   { random_position++;
  74     if (random_position==random_table_length) random_position = 0;
  75     return (random_table[random_position/8] >> (random_position % 8)) & 1;
  76   }
  77
  78 #if defined(__STDC__) || defined(__cplusplus)
  79 void printf_underscored (const char* string)
  80 #else
  81 void printf_underscored(string)
  82   char* string;
  83 #endif
  84   { char c;
  85     while (!((c = *string++) == '\0')) { printf("%c",(c==' ' ? '_' : c)); }
  86   }
  87
  88 /* string_length(string) is the same as strlen(string). */
  89 /* Better avoid to depend on <string.h>. */
  90 #if defined(__STDC__) || defined(__cplusplus)
  91 int string_length (char* string)
  92 #else
  93 int string_length(string)
  94   char* string;
  95 #endif
  96   { int count = 0;
  97     while (!(*string++ == '\0')) { count++; }
  98     return count;
  99   }
 100
 101 static int char_bitsize, short_bitsize, int_bitsize, long_bitsize;
 102 static int uchar_bitsize, ushort_bitsize, uint_bitsize, ulong_bitsize;
 103 static boolean char_uchar_same, short_ushort_same, int_uint_same, long_ulong_same;
 104 static int pointer_bitsize;
 105 #ifdef HAVE_LONGLONG
 106 static int longlong_bitsize, ulonglong_bitsize;
 107 static boolean longlong_ulonglong_same;
 108 #endif
 109
 110 void main1(void) {
 111 #define get_integer_bitsize(type,where)  \
 112   { type x = 1;                                 \
 113     int bits = 0;                               \
 114     loop                                        \
 115       { if (x==0) break;                        \
 116         x = x+x;                                \
 117         bits++;                                 \
 118         if (bits==1000) { bits = -1; break; }   \
 119       }                                         \
 120     where = bits;                               \
 121   }
 122 #define print_integer_bitsize(type,typestr,where)  \
 123   { if (where >= 0)                                                  \
 124       { printf("/* Integers of t%spe %s have %ld bits. */\n","y",typestr,(long)where); \
 125         if (!(typestr[0] == 'u'))                                    \
 126           { printf("#define "); printf_underscored(typestr); printf("_bitsize %ld\n",(long)where); } \
 127         printf("\n");                                                \
 128       }                                                              \
 129       else                                                           \
 130       { printf("#error \"Integers of t%spe %s have no binary representation!!\"\n","y",typestr); } \
 131     if (!(where == char_bitsize * sizeof(type)))                     \
 132       { printf("#error \"Formula BITSIZE(T) = SIZEOF(T) * BITSPERBYTE does not hold for t%spe %s!!\"\n","y",typestr); } \
 133   }
 134   get_integer_bitsize(schar,char_bitsize);
 135   get_integer_bitsize(short,short_bitsize);
 136   get_integer_bitsize(int,int_bitsize);
 137   get_integer_bitsize(long,long_bitsize);
 138   print_integer_bitsize(schar,"char",char_bitsize);
 139   print_integer_bitsize(short,"short",short_bitsize);
 140   print_integer_bitsize(int,"int",int_bitsize);
 141   print_integer_bitsize(long,"long",long_bitsize);
 142 #ifdef HAVE_LONGLONG
 143   get_integer_bitsize(longlong,longlong_bitsize);
 144   print_integer_bitsize(longlong,"long long",longlong_bitsize);
 145 #endif
 146   get_integer_bitsize(uchar,uchar_bitsize);
 147   get_integer_bitsize(ushort,ushort_bitsize);
 148   get_integer_bitsize(uint,uint_bitsize);
 149   get_integer_bitsize(ulong,ulong_bitsize);
 150   print_integer_bitsize(uchar,"unsigned char",uchar_bitsize);
 151   print_integer_bitsize(ushort,"unsigned short",ushort_bitsize);
 152   print_integer_bitsize(uint,"unsigned int",uint_bitsize);
 153   print_integer_bitsize(ulong,"unsigned long",ulong_bitsize);
 154 #ifdef HAVE_LONGLONG
 155   get_integer_bitsize(ulonglong,ulonglong_bitsize);
 156   print_integer_bitsize(ulonglong,"unsigned long long",ulonglong_bitsize);
 157 #endif
 158 }
 159
 160 void main2(void) {
 161 #define compare_integer_bitsizes(typestr1,typestr2,type1_bitsize,type2_bitsize)  \
 162   { if (!(type1_bitsize==type2_bitsize))                                                       \
 163       printf("#error \"Integer types %s and %s have different sizes!!\"\n",typestr1,typestr2); \
 164   }
 165   compare_integer_bitsizes("char","unsigned char",char_bitsize,uchar_bitsize);
 166   compare_integer_bitsizes("short","unsigned short",short_bitsize,ushort_bitsize);
 167   compare_integer_bitsizes("int","unsigned int",int_bitsize,uint_bitsize);
 168   compare_integer_bitsizes("long","unsigned long",long_bitsize,ulong_bitsize);
 169 #ifdef HAVE_LONGLONG
 170   compare_integer_bitsizes("long long","unsigned long long",longlong_bitsize,ulonglong_bitsize);
 171 #endif
 172 }
 173
 174 #define get_a_random(type,bitsize,where)  \
 175   { type x = 0;                                          \
 176     int i = bitsize;                                     \
 177     while (i>0) { x = (x<<1) + next_random_bit(); i--; } \
 178     where = x;                                           \
 179   }
 180 #define get_a_random_twice(type1,type2,bitsize,where1,where2)  \
 181   { type1 x1 = 0; type2 x2 = 0;                 \
 182     int i = bitsize;                            \
 183     while (i>0)                                 \
 184       { type1 b = next_random_bit();            \
 185         x1 = ((x1<<1) + b); x2 = ((x2<<1) + b); \
 186         i--;                                    \
 187       }                                         \
 188     where1 = x1; where2 = x2;                   \
 189   }
 190
 191 void main3(void) {
 192 #define compare_integer_representation(type1,type2,typestr1,typestr2,type1_bitsize,type2_bitsize,where)  \
 193   { if ((type1_bitsize>=0) && (type2_bitsize>=0) && (type1_bitsize==type2_bitsize))           \
 194       { int i,j;                                                                              \
 195         type1 sample1; type2 sample2;                                                         \
 196         where = TRUE;                                                                         \
 197         for (i = 0; i<100; i++)                                                               \
 198           { get_a_random_twice(type1,type2,type1_bitsize,sample1,sample2);                    \
 199             if (!(sample1 == (type1)(sample2))) { where = FALSE; }                            \
 200             if (!(sample2 == (type2)(sample1))) { where = FALSE; }                            \
 201           }                                                                                   \
 202         for (i = 0; i<100; i++)                                                               \
 203           { get_a_random(type1,type1_bitsize,sample1);                                        \
 204             sample2 = (type2)(sample1);                                                       \
 205             for (j = 0; j < type1_bitsize; j++)                                               \
 206               if (!( ((sample1 & ((type1)1<<j)) == 0)                                         \
 207                      == ((sample2 & ((type2)1<<j)) == 0)                                      \
 208                  ) )                                                                          \
 209                 { where = FALSE; }                                                            \
 210           }                                                                                   \
 211         if (where)                                                                            \
 212           { printf("/* Integer types %s and %s have the same binary representation. */\n",typestr1,typestr2); } \
 213           else                                                                                \
 214           { printf("#error \"Integer types %s and %s have different binary representations!!\"\n",typestr1,typestr2); } \
 215       }                                                                                       \
 216       else                                                                                    \
 217       { where = FALSE; }                                                                      \
 218   }
 219   compare_integer_representation(schar,uchar,"char","unsigned char",char_bitsize,uchar_bitsize,char_uchar_same);
 220   compare_integer_representation(short,ushort,"short","unsigned short",short_bitsize,ushort_bitsize,short_ushort_same);
 221   compare_integer_representation(int,uint,"int","unsigned int",int_bitsize,uint_bitsize,int_uint_same);
 222   compare_integer_representation(long,ulong,"long","unsigned long",long_bitsize,ulong_bitsize,long_ulong_same);
 223 #ifdef HAVE_LONGLONG
 224   compare_integer_representation(longlong,ulonglong,"long long","unsigned long long",longlong_bitsize,ulonglong_bitsize,longlong_ulonglong_same);
 225 #endif
 226   printf("\n");
 227 }
 228
 229 void main4(void) {
 230 #define test_integer_ushift(type,typestr,type_bitsize)  \
 231   if (type_bitsize >= 0)                                                                        \
 232     { int i,j,shc;                                                                              \
 233       type sample1,sample2;                                                                     \
 234       boolean left_works = TRUE, right_works = TRUE;                                            \
 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 < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0))               \
 243                      ) )                                                                        \
 244                     { left_works = FALSE; }                                                     \
 245         }   }   }                                                                               \
 246       for (i = 0; i<100; i++)                                                                   \
 247         { get_a_random(type,type_bitsize,sample1);                                              \
 248           for (shc = 0; shc < type_bitsize; shc++)                                              \
 249             { sample2 = sample1 >> shc;                                                         \
 250               for (j=0; j < type_bitsize; j++)                                                  \
 251                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                        \
 252                          ==                                                                     \
 253                          (j >= type_bitsize-shc ? TRUE : ((sample1 & ((type)1<<(j+shc))) == 0)) \
 254                      ) )                                                                        \
 255                     { right_works = FALSE; }                                                    \
 256         }   }   }                                                                               \
 257       if (!left_works)                                                                          \
 258         { printf("#error \"Left shift of integers of t%spe %s does not work!!\"\n","y",typestr); } \
 259       if (!right_works)                                                                         \
 260         { printf("#error \"Right shift of integers of t%spe %s does not work!!\"\n","y",typestr); } \
 261     }
 262 #define test_integer_sshift(type,typestr,type_bitsize)  \
 263   if (type_bitsize >= 0)                                                                       \
 264     { int i,j,shc;                                                                             \
 265       type sample1,sample2;                                                                    \
 266       boolean left_works = TRUE, right_works = TRUE;                                           \
 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                          (j < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0))              \
 275                      ) )                                                                       \
 276                     { left_works = FALSE; }                                                    \
 277         }   }   }                                                                              \
 278       for (i = 0; i<100; i++)                                                                  \
 279         { get_a_random(type,type_bitsize,sample1);                                             \
 280           for (shc = 0; shc < type_bitsize; shc++)                                             \
 281             { sample2 = sample1 >> shc;                                                        \
 282               for (j=0; j < type_bitsize; j++)                                                 \
 283                 { if (!( ((sample2 & ((type)1<<j)) == 0)                                       \
 284                          ==                                                                    \
 285                          ((sample1 & ((type)1<< (j+shc>=type_bitsize ? type_bitsize-1 : j+shc))) == 0) \
 286                      ) )                                                                       \
 287                     { right_works = FALSE; }                                                   \
 288         }   }   }                                                                              \
 289       if (!left_works)                                                                         \
 290         { printf("#error \"Left shift of integers of t%spe %s does not work!!\"\n","y",typestr); } \
 291       if (!right_works)                                                                        \
 292         { printf("#error \"Right shift of integers of t%spe %s does not work!!\"\n","y",typestr); } \
 293     }
 294   test_integer_ushift(uchar,"unsigned char",uchar_bitsize);
 295   test_integer_ushift(ushort,"unsigned short",ushort_bitsize);
 296   test_integer_ushift(uint,"unsigned int",uint_bitsize);
 297   test_integer_ushift(ulong,"unsigned long",ulong_bitsize);
 298 #ifdef HAVE_LONGLONG
 299   test_integer_ushift(ulonglong,"unsigned long long",ulonglong_bitsize);
 300 #endif
 301   test_integer_sshift(schar,"char",char_bitsize);
 302   test_integer_sshift(short,"short",short_bitsize);
 303   test_integer_sshift(int,"int",int_bitsize);
 304   test_integer_sshift(long,"long",long_bitsize);
 305 #ifdef HAVE_LONGLONG
 306   test_integer_sshift(longlong,"long long",longlong_bitsize);
 307 #endif
 308 }
 309
 310 void main5(void) {
 311 #define test_integer_casts(type1,type2,typestr1,typestr2,type1_bitsize,type2_bitsize,want)  \
 312   if (type1_bitsize <= type2_bitsize)                                                                      \
 313     { int i,j;                                                                                             \
 314       boolean modifies = FALSE;                                                                            \
 315       boolean zero_extends = TRUE;                                                                         \
 316       boolean sign_extends = TRUE;                                                                         \
 317       for (i = 0; i<100; i++)                                                                              \
 318         { type1 sample1;                                                                                   \
 319           type2 sample2;                                                                                   \
 320           get_a_random(type1,type1_bitsize,sample1);                                                       \
 321           sample2 = (type2)sample1;                                                                        \
 322           if (!(sample1 == (type1)sample2)) { modifies = TRUE; }                                           \
 323           for (j = 0; j<type1_bitsize; j++)                                                                \
 324             if (!( ((sample1 & ((type1)1<<j)) == 0) == ((sample2 & ((type2)1<<j)) == 0) ))                 \
 325               { zero_extends = FALSE; sign_extends = FALSE; }                                              \
 326           for (j = type1_bitsize; j<type2_bitsize; j++)                                                    \
 327             if (!((sample2 & ((type2)1<<j)) == 0))                                                         \
 328               { zero_extends = FALSE; }                                                                    \
 329           for (j = type1_bitsize; j<type2_bitsize; j++)                                                    \
 330             if (!( ((sample1 & ((type1)1<<(type1_bitsize-1))) == 0) == ((sample2 & ((type2)1<<j)) == 0) )) \
 331               { sign_extends = FALSE; }                                                                    \
 332         }                                                                                                  \
 333       if (modifies)                                                                                        \
 334         printf("#error \"Casts: (%s)(%s)(x) == x does not hold for every %s x !!\"\n",typestr1,typestr2,typestr1); \
 335       if (zero_extends && sign_extends)                                                                    \
 336         { if (!(type1_bitsize == type2_bitsize))                                                           \
 337             printf("#error \"Casts from %s to %s works by identity!!\"\n",typestr1,typestr2);              \
 338         }                                                                                                  \
 339       if (zero_extends && !sign_extends)                                                                   \
 340         { if ((type1_bitsize == type2_bitsize) || !(typestr1[0] == 'u') || !(want==1))                     \
 341             printf("#error \"Casts from %s to %s works by zero-extend!!\"\n",typestr1,typestr2);           \
 342         }                                                                                                  \
 343       if (sign_extends && !zero_extends)                                                                   \
 344         { if ((type1_bitsize == type2_bitsize) || (typestr1[0] == 'u') || !(want==2))                      \
 345             printf("#error \"Casts from %s to %s works by sign-extend!!\"\n",typestr1,typestr2);           \
 346         }                                                                                                  \
 347       if (!sign_extends && !zero_extends)                                                                  \
 348         printf("#error \"Casts from %s to %s works in an unknown manner!!\"\n",typestr1,typestr2);         \
 349     }
 350   /* erst Casts zwischen Integers vermutlich gleicher Größe: */
 351   test_integer_casts(schar,uchar,"char","unsigned char",char_bitsize,uchar_bitsize,0);
 352   test_integer_casts(short,ushort,"short","unsigned short",short_bitsize,ushort_bitsize,0);
 353   test_integer_casts(int,uint,"int","unsigned int",int_bitsize,uint_bitsize,0);
 354   test_integer_casts(long,ulong,"long","unsigned long",long_bitsize,ulong_bitsize,0);
 355   test_integer_casts(uchar,schar,"unsigned char","char",uchar_bitsize,char_bitsize,0);
 356   test_integer_casts(ushort,short,"unsigned short","short",ushort_bitsize,short_bitsize,0);
 357   test_integer_casts(uint,int,"unsigned int","int",uint_bitsize,int_bitsize,0);
 358   test_integer_casts(ulong,long,"unsigned long","long",ulong_bitsize,long_bitsize,0);
 359 #ifdef HAVE_LONGLONG
 360   test_integer_casts(longlong,ulonglong,"long long","unsigned long long",longlong_bitsize,ulonglong_bitsize,0);
 361   test_integer_casts(ulonglong,longlong,"unsigned long long","long long",ulonglong_bitsize,longlong_bitsize,0);
 362 #endif
 363   /* dann Casts zwischen Integers unterschiedlicher Größe, aber gleichen Vorzeichens: */
 364   test_integer_casts(uchar,ushort,"unsigned char","unsigned short",uchar_bitsize,ushort_bitsize,1);
 365   test_integer_casts(uchar,uint,"unsigned char","unsigned int",uchar_bitsize,uint_bitsize,1);
 366   test_integer_casts(uchar,ulong,"unsigned char","unsigned long",uchar_bitsize,ulong_bitsize,1);
 367   test_integer_casts(ushort,uint,"unsigned short","unsigned int",ushort_bitsize,uint_bitsize,1);
 368   test_integer_casts(ushort,ulong,"unsigned short","unsigned long",ushort_bitsize,ulong_bitsize,1);
 369   test_integer_casts(uint,ulong,"unsigned int","unsigned long",uint_bitsize,ulong_bitsize,1);
 370 #ifdef HAVE_LONGLONG
 371   test_integer_casts(uchar,ulonglong,"unsigned char","unsigned long long",uchar_bitsize,ulonglong_bitsize,1);
 372   test_integer_casts(ushort,ulonglong,"unsigned short","unsigned long long",ushort_bitsize,ulonglong_bitsize,1);
 373   test_integer_casts(uint,ulonglong,"unsigned int","unsigned long long",uint_bitsize,ulonglong_bitsize,1);
 374   test_integer_casts(ulong,ulonglong,"unsigned long","unsigned long long",ulong_bitsize,ulonglong_bitsize,1);
 375 #endif
 376   test_integer_casts(schar,short,"char","short",char_bitsize,short_bitsize,2);
 377   test_integer_casts(schar,int,"char","int",char_bitsize,int_bitsize,2);
 378   test_integer_casts(schar,long,"char","long",char_bitsize,long_bitsize,2);
 379   test_integer_casts(short,int,"short","int",short_bitsize,int_bitsize,2);
 380   test_integer_casts(short,long,"short","long",short_bitsize,long_bitsize,2);
 381   test_integer_casts(int,long,"int","long",int_bitsize,long_bitsize,2);
 382 #ifdef HAVE_LONGLONG
 383   test_integer_casts(schar,longlong,"char","long long",char_bitsize,longlong_bitsize,2);
 384   test_integer_casts(short,longlong,"short","long long",short_bitsize,longlong_bitsize,2);
 385   test_integer_casts(int,longlong,"int","long long",int_bitsize,longlong_bitsize,2);
 386   test_integer_casts(long,longlong,"long","long long",long_bitsize,longlong_bitsize,2);
 387 #endif
 388   /* dann Casts zwischen Integers unterschiedlicher Größe und unterschiedlichen Vorzeichens: */
 389   test_integer_casts(uchar,short,"unsigned char","short",uchar_bitsize,short_bitsize,1);
 390   test_integer_casts(uchar,int,"unsigned char","int",uchar_bitsize,int_bitsize,1);
 391   test_integer_casts(uchar,long,"unsigned char","long",uchar_bitsize,long_bitsize,1);
 392   test_integer_casts(ushort,int,"unsigned short","int",ushort_bitsize,int_bitsize,1);
 393   test_integer_casts(ushort,long,"unsigned short","long",ushort_bitsize,long_bitsize,1);
 394   test_integer_casts(uint,long,"unsigned int","long",uint_bitsize,long_bitsize,1);
 395 #ifdef HAVE_LONGLONG
 396   test_integer_casts(uchar,longlong,"unsigned char","long long",uchar_bitsize,longlong_bitsize,1);
 397   test_integer_casts(ushort,longlong,"unsigned short","long long",ushort_bitsize,longlong_bitsize,1);
 398   test_integer_casts(uint,longlong,"unsigned int","long long",uint_bitsize,longlong_bitsize,1);
 399   test_integer_casts(ulong,longlong,"unsigned long","long long",ulong_bitsize,longlong_bitsize,1);
 400 #endif
 401   test_integer_casts(schar,ushort,"char","unsigned short",char_bitsize,ushort_bitsize,2);
 402   test_integer_casts(schar,uint,"char","unsigned int",char_bitsize,uint_bitsize,2);
 403   test_integer_casts(schar,ulong,"char","unsigned long",char_bitsize,ulong_bitsize,2);
 404   test_integer_casts(short,uint,"short","unsigned int",short_bitsize,uint_bitsize,2);
 405   test_integer_casts(short,ulong,"short","unsigned long",short_bitsize,ulong_bitsize,2);
 406   test_integer_casts(int,ulong,"int","unsigned long",int_bitsize,ulong_bitsize,2);
 407 #ifdef HAVE_LONGLONG
 408   test_integer_casts(schar,ulonglong,"char","unsigned long long",char_bitsize,ulonglong_bitsize,2);
 409   test_integer_casts(short,ulonglong,"short","unsigned long long",short_bitsize,ulonglong_bitsize,2);
 410   test_integer_casts(int,ulonglong,"int","unsigned long long",int_bitsize,ulonglong_bitsize,2);
 411   test_integer_casts(long,ulonglong,"long","unsigned long long",long_bitsize,ulonglong_bitsize,2);
 412 #endif
 413 }
 414
 415 void main6(void) {
 416 #define check_sizeof_pointer(type,typestr)  \
 417   { if (!(sizeof(type) <= sizeof(long)))                                 \
 418       printf("#error \"Type %s does not fit into a long!!\"\n",typestr); \
 419   }
 420   check_sizeof_pointer(char*,"char *");
 421   check_sizeof_pointer(long*,"long *");
 422   check_sizeof_pointer(function*,"function *");
 423   pointer_bitsize = char_bitsize * sizeof(char*);
 424   printf("/* Pointers of t%spe %s have %ld bits. */\n","y","char *",(long)pointer_bitsize);
 425   printf("#define pointer_bitsize %ld\n",(long)pointer_bitsize);
 426   printf("\n");
 427 }
 428
 429 void main7(void) {
 430 #define test_pointer_casts(type1,type2,typestr1,typestr2)  \
 431   if (!(sizeof(type1) == sizeof(type2)))                                                               \
 432     { printf("#error \"Pointer types %s and %s have different sizes!!\"\n",typestr1,typestr2); }       \
 433     else                                                                                               \
 434     { int i;                                                                                           \
 435       ulong differences1 = 0, differences2 = 0;                                                        \
 436       for (i = 0; i<100; i++)                                                                          \
 437         { ulong sample;                                                                                \
 438           type1 sample1;                                                                               \
 439           type2 sample2;                                                                               \
 440           get_a_random(ulong,ulong_bitsize,sample);                                                    \
 441           sample1 = (type1)sample;                                                                     \
 442           sample2 = (type2)sample;                                                                     \
 443           differences1 |= ((ulong)sample1 ^ (ulong)(type1)(sample2));                                  \
 444           differences2 |= ((ulong)sample2 ^ (ulong)(type2)(sample1));                                  \
 445         }                                                                                              \
 446       if (differences1==0)                                                                             \
 447         printf("/* Casts from %s to %s is OK (does nothing). */\n",typestr2,typestr1);                 \
 448       else                                                                                             \
 449       if (differences1 == ~(ulong)0)                                                                   \
 450         printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr2,typestr1);         \
 451       else                                                                                             \
 452         printf("#error \"Casts from %s to %s modify part 0x%8lX of pointer!!\"\n",typestr2,typestr1,differences1); \
 453       if (differences2==0)                                                                             \
 454         printf("/* Casts from %s to %s is OK (does nothing). */\n",typestr1,typestr2);                 \
 455       else                                                                                             \
 456       if (differences2 == ~(ulong)0)                                                                   \
 457         printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr1,typestr2);         \
 458       else                                                                                             \
 459         printf("#error \"Casts from %s to %s modify part 0x%8lX of pointer!!\"\n",typestr1,typestr2,differences2); \
 460     }
 461   test_pointer_casts(char*,long*,"char *","long *");
 462   test_pointer_casts(char*,function*,"char *","function *");
 463   printf("\n");
 464 }
 465
 466 void main8(void) {
 467 /* The following macro works only in C, not in C++, because C++ restricts the
 468    use of NULL pointers and also because C++ forbids defining types within a
 469    cast. */
 470 #define alignmentof(type)  \
 471   (int)(&((struct { char dummy1; type dummy2; } *)0)->dummy2)
 472 #define get_alignment(type,typestr)  \
 473   { struct { char dummy1; type dummy2; } dummy;                                                           \
 474     long alignment = (char*)&dummy.dummy2 - (char*)&dummy;                                                \
 475     printf("/* Type %s has sizeof = %ld and alignment = %ld. */\n",typestr,(long)sizeof(type),alignment); \
 476     if (!(typestr[0] == 'u') && !(typestr[string_length(typestr)-1] == '*'))                              \
 477       { printf("#define sizeof_"); printf_underscored(typestr); printf(" %ld\n",(long)sizeof(type));      \
 478         printf("#define alignment_"); printf_underscored(typestr); printf(" %ld\n",alignment);            \
 479       }                                                                                                   \
 480     if (!((alignment & (alignment-1)) == 0))                                                              \
 481       printf("#error \"The alignment %ld of t%spe %s is not a power of two!!\"\n",alignment,"y",typestr); \
 482     printf("\n");                                                                                         \
 483   }
 484   get_alignment(char,"char"); get_alignment(uchar,"unsigned char");
 485   get_alignment(short,"short"); get_alignment(ushort,"unsigned short");
 486   get_alignment(int,"int"); get_alignment(uint,"unsigned int");
 487   get_alignment(long,"long"); get_alignment(ulong,"unsigned long");
 488 #ifdef HAVE_LONGLONG
 489   get_alignment(longlong,"long long"); get_alignment(ulonglong,"unsigned long long");
 490 #endif
 491   get_alignment(float,"float");
 492   get_alignment(double,"double");
 493   get_alignment(char*,"char *");
 494   get_alignment(long*,"long *");
 495   get_alignment(function*,"function *");
 496 }
 497
 498 void main9(void) {
 499 #define get_endian(type,typestr,type_bitsize)  \
 500   { if (type_bitsize == uchar_bitsize * sizeof(type))                                            \
 501       { auto union { uchar einzeln[sizeof(type)]; type gesamt; } x;                              \
 502         int i,j;                                                                                 \
 503         boolean big_endian = TRUE;                                                               \
 504         boolean little_endian = TRUE;                                                            \
 505         for (i = 0; i<100; i++)                                                                  \
 506           { type sample;                                                                         \
 507             get_a_random(type,type_bitsize,sample);                                              \
 508             x.gesamt = sample;                                                                   \
 509             for (j = 0; j<sizeof(type); j++, sample >>= uchar_bitsize)                           \
 510               { if (!( (sample & (((type)1<<uchar_bitsize)-1)) == x.einzeln[j] ))                \
 511                   { little_endian = FALSE; }                                                     \
 512                 if (!( (sample & (((type)1<<uchar_bitsize)-1)) == x.einzeln[sizeof(type)-1-j] )) \
 513                   { big_endian = FALSE; }                                                        \
 514           }   }                                                                                  \
 515         if (big_endian && little_endian)                                                         \
 516           { if (!(sizeof(type) == 1))                                                            \
 517               printf("#error \"Endianness of t%spe %s in memory doesn't matter.\"\n","y",typestr); } \
 518         if (big_endian && !little_endian)                                                        \
 519           { printf("/* Type %s is stored BIG-ENDIAN in memory (i.e. like mc68000 or sparc). */\n",typestr); \
 520             printf("#define "); printf_underscored(&typestr[9]); printf("_big_endian\n");        \
 521           }                                                                                      \
 522         if (little_endian && !big_endian)                                                        \
 523           { printf("/* Type %s is stored LITTLE-ENDIAN in memory (i.e. like Z80 or VAX). */\n",typestr); \
 524             printf("#define "); printf_underscored(&typestr[9]); printf("_little_endian\n");     \
 525           }                                                                                      \
 526         if (!big_endian && !little_endian)                                                       \
 527           { printf("#error \"Type %s is stored in memory in an obscure manner!!\"\n",typestr); } \
 528       }                                                                                          \
 529       else                                                                                       \
 530       { printf("#error \"Endianness makes no sense for t%spe %s !!\"\n","y",typestr); }          \
 531   }
 532   get_endian(uchar,"unsigned char",uchar_bitsize);
 533   get_endian(ushort,"unsigned short",ushort_bitsize);
 534   get_endian(uint,"unsigned int",uint_bitsize);
 535   get_endian(ulong,"unsigned long",ulong_bitsize);
 536 #ifdef HAVE_LONGLONG
 537   get_endian(ulonglong,"unsigned long long",ulonglong_bitsize);
 538 #endif
 539   printf("\n");
 540 }
 541
 542 long get_stack_direction(void)
 543   { auto char dummy;
 544     static char* dummyaddr = (char*)0;
 545     if (!(dummyaddr == (char*)0))
 546       { return (&dummy) - dummyaddr; }
 547     else
 548       { dummyaddr = &dummy;
 549         { long result = get_stack_direction();
 550           /* The next assignment avoids tail recursion elimination (IRIX 6.4 CC). */
 551           dummyaddr = (char*)0;
 552           return result;
 553       } }
 554   }
 555
 556 void main10(void)
 557   { long stack_direction = get_stack_direction();
 558     if (stack_direction > 0)
 559       { printf("/* Stack grows up, ca. %ld bytes per function call. */\n",(long)stack_direction);
 560         printf("#define stack_grows_up\n");
 561       }
 562     else if (stack_direction < 0)
 563       { printf("/* Stack grows down, ca. %ld bytes per function call. */\n",-(long)stack_direction);
 564         printf("#define stack_grows_down\n");
 565       }
 566     else
 567       printf("#error \"Unknown stack model -- incorrect C semantics!!\"\n");
 568   }
 569
 570 int main()
 571 { main1();
 572   main2();
 573   main3();
 574   main4();
 575   main5();
 576   main6();
 577   main7();
 578   main8();
 579   main9();
 580   main10();
 581 #if defined(__cplusplus)
 582   if (ferror(stdout)) return 1;
 583   return 0;
 584 #else
 585   if (ferror(stdout)) { exit(1); }
 586   exit(0);
 587 #endif
 588 }