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 */
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. */
10 #define ushort os_ushort
12 #define ulong os_ulong
26 #ifdef __CHAR_UNSIGNED__
27 typedef signed char schar;
31 typedef unsigned char uchar;
32 typedef unsigned short ushort;
33 typedef unsigned /* int */ uint;
34 typedef unsigned long ulong;
36 typedef long long longlong;
37 typedef unsigned long long ulonglong;
39 typedef int (function)();
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,
65 #define random_table_length (8*256)
66 static int random_position = -1;
67 int next_random_bit(void)
69 if (random_position==random_table_length) random_position = 0;
70 return (random_table[random_position/8] >> (random_position % 8)) & 1;
73 void printf_underscored (const char* string)
75 while (!((c = *string++) == '\0')) { printf("%c",(c==' ' ? '_' : c)); }
78 /* string_length(string) is the same as strlen(string). */
79 /* Better avoid to depend on <string.h>. */
80 int string_length (char* string)
82 while (!(*string++ == '\0')) { count++; }
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;
91 static int longlong_bitsize, ulonglong_bitsize;
92 static boolean longlong_ulonglong_same;
96 #define get_unsigned_integer_bitsize(type,where) \
103 if (bits==1000) { bits = -1; break; } \
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. */ \
117 x = (unsigned_type)x + (unsigned_type)x;\
119 if (bits==1000) { bits = -1; break; } \
123 #define print_integer_bitsize(type,typestr,where) \
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); } \
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); } \
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);
144 get_signed_integer_bitsize(longlong,ulonglong,longlong_bitsize);
145 print_integer_bitsize(longlong,"long long",longlong_bitsize);
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);
156 get_unsigned_integer_bitsize(ulonglong,ulonglong_bitsize);
157 print_integer_bitsize(ulonglong,"unsigned long long",ulonglong_bitsize);
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); \
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);
171 compare_integer_bitsizes("long long","unsigned long long",longlong_bitsize,ulonglong_bitsize);
175 #define get_a_random(type,bitsize,where) \
178 while (i>0) { x = (x<<1) + next_random_bit(); i--; } \
181 #define get_a_random_twice(type1,type2,bitsize,where1,where2) \
182 { type1 x1 = 0; type2 x2 = 0; \
185 { type1 b = next_random_bit(); \
186 x1 = ((x1<<1) + b); x2 = ((x2<<1) + b); \
189 where1 = x1; where2 = x2; \
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)) \
196 type1 sample1; type2 sample2; \
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; } \
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) \
213 { printf("/* Integer types %s and %s have the same binary representation. */\n",typestr1,typestr2); } \
215 { printf("#error \"Integer types %s and %s have different binary representations!!\"\n",typestr1,typestr2); } \
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);
225 compare_integer_representation(longlong,ulonglong,"long long","unsigned long long",longlong_bitsize,ulonglong_bitsize,longlong_ulonglong_same);
231 #define test_integer_ushift(type,typestr,type_bitsize) \
232 if (type_bitsize >= 0) \
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) \
243 (j < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0)) \
245 { left_works = FALSE; } \
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) \
254 (j >= type_bitsize-shc ? TRUE : ((sample1 & ((type)1<<(j+shc))) == 0)) \
256 { right_works = FALSE; } \
259 { printf("#error \"Left shift of integers of type %s does not work!!\"\n",typestr); } \
261 { printf("#error \"Right shift of integers of type %s does not work!!\"\n",typestr); } \
263 #define test_integer_sshift(type,typestr,type_bitsize) \
264 if (type_bitsize >= 0) \
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) \
275 (j < shc ? TRUE : ((sample1 & ((type)1<<(j-shc))) == 0)) \
277 { left_works = FALSE; } \
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) \
286 ((sample1 & ((type)1<< (j+shc>=type_bitsize ? type_bitsize-1 : j+shc))) == 0) \
288 { right_works = FALSE; } \
291 { printf("#error \"Left shift of integers of type %s does not work!!\"\n",typestr); } \
293 { printf("#error \"Right shift of integers of type %s does not work!!\"\n",typestr); } \
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);
300 test_integer_ushift(ulonglong,"unsigned long long",ulonglong_bitsize);
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);
307 test_integer_sshift(longlong,"long long",longlong_bitsize);
312 #define test_integer_casts(type1,type2,typestr1,typestr2,type1_bitsize,type2_bitsize,want) \
313 if (type1_bitsize <= type2_bitsize) \
315 boolean modifies = FALSE; \
316 boolean zero_extends = TRUE; \
317 boolean sign_extends = TRUE; \
318 for (i = 0; i<100; i++) \
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; } \
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); \
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); \
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); \
348 if (!sign_extends && !zero_extends) \
349 printf("#error \"Casts from %s to %s works in an unknown manner!!\"\n",typestr1,typestr2); \
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);
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);
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);
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);
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);
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);
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);
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);
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);
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);
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); \
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);
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); } \
436 uintptr_t differences1 = 0, differences2 = 0; \
437 for (i = 0; i<100; i++) \
438 { uintptr_t sample; \
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)); \
447 if (differences1==0) \
448 printf("/* Casts from %s to %s is OK (does nothing). */\n",typestr2,typestr1); \
450 if (differences1 == ~(uintptr_t)0) \
451 printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr2,typestr1); \
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); \
457 if (differences2 == ~(uintptr_t)0) \
458 printf("#error \"Casts from %s to %s work in an unknown way!!\"\n",typestr1,typestr2); \
460 printf("#error \"Casts from %s to %s modify part 0x%8lX of pointer!!\"\n",typestr1,typestr2,differences2); \
462 test_pointer_casts(char*,long*,"char *","long *");
463 test_pointer_casts(char*,function*,"char *","function *");
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
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); \
481 if (!((alignment & (alignment-1)) == 0)) \
482 printf("#error \"The alignment %ld of type %s is not a power of two!!\"\n",alignment,typestr); \
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");
490 get_alignment(longlong,"long long"); get_alignment(ulonglong,"unsigned long long");
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 *");
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; \
504 boolean big_endian = TRUE; \
505 boolean little_endian = TRUE; \
506 for (i = 0; i<100; i++) \
508 get_a_random(type,type_bitsize,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; } \
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"); \
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"); \
527 if (!big_endian && !little_endian) \
528 { printf("#error \"Type %s is stored in memory in an obscure manner!!\"\n",typestr); } \
531 { printf("#error \"Endianness makes no sense for type %s !!\"\n",typestr); } \
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);
538 get_endian(ulonglong,"unsigned long long",ulonglong_bitsize);
543 long get_stack_direction(void)
545 static char* dummyaddr = (char*)0;
546 if (!(dummyaddr == (char*)0))
547 { return (&dummy) - dummyaddr; }
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;
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");
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");
568 printf("#error \"Unknown stack model -- incorrect C semantics!!\"\n");
582 if (ferror(stdout) || fclose(stdout)) return 1;