git.distorted.org.uk Git - u/mdw/catacomb/blob - genlimits.c

   1 /* -*-c-*-
   2  *
   3  * $Id$
   4  *
   5  * Generate limit MPs for C types
   6  *
   7  * (c) 2006 Straylight/Edgeware
   8  */
   9
  10 /*----- Licensing notice --------------------------------------------------*
  11  *
  12  * This file is part of Catacomb.
  13  *
  14  * Catacomb is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU Library General Public License as
  16  * published by the Free Software Foundation; either version 2 of the
  17  * License, or (at your option) any later version.
  18  *
  19  * Catacomb is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU Library General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU Library General Public
  25  * License along with Catacomb; if not, write to the Free
  26  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  27  * MA 02111-1307, USA.
  28  */
  29
  30 /*----- Header files ------------------------------------------------------*/
  31
  32 #define _GNU_SOURCE
  33 #include <errno.h>
  34 #include <limits.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37
  38 #if __STDC_VERSION__ >= 199900l
  39 #  include <stdint.h>
  40 #  include <inttypes.h>
  41 #endif
  42
  43 #include "mp.h"
  44 #include "mpint.h"
  45
  46 /*----- Data types --------------------------------------------------------*/
  47
  48 /* --- Hack for GCC --- *
  49  *
  50  * WG14 in their infinite wisdom decided not to use the GCC constant name.
  51  */
  52
  53 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 91)
  54 #  define EXT __extension__
  55 #else
  56 #  define EXT
  57 #endif
  58
  59 #if defined(LONG_LONG_MIN) && !defined(LLONG_MIN)
  60 #  define LLONG_MIN EXT LONG_LONG_MIN
  61 #endif
  62
  63 #if defined(LONG_LONG_MAX) && !defined(LLONG_MAX)
  64 #  define LLONG_MAX EXT LONG_LONG_MAX
  65 #endif
  66
  67 #if defined(ULONG_LONG_MAX) && !defined(ULLONG_MAX)
  68 #  define ULLONG_MAX EXT ULONG_LONG_MAX
  69 #endif
  70
  71 /* --- Choose the largest integer type --- */
  72
  73 #if defined(INTMAX_MAX)
  74   typedef intmax_t imax;
  75 #elif defined(LLONG_MAX)
  76   EXT typedef long long imax;
  77 #else
  78   typedef long imax;
  79 #endif
  80
  81 #if defined(UINTMAX_MAX)
  82   typedef uintmax_t umax;
  83 #elif defined(ULLONG_MAX)
  84   EXT typedef unsigned long long umax;
  85 #else
  86   typedef unsigned long umax;
  87 #endif
  88
  89 /*----- Main code ---------------------------------------------------------*/
  90
  91 #define TABSZ 64
  92
  93 enum { NEG, POS, NSIGN };
  94
  95 umax cmap[TABSZ];
  96 int gmap[TABSZ][NSIGN];
  97 struct { int g, s; } qmap[TABSZ];
  98 int dumpp = 0;
  99
 100 static int n, q;
 101
 102 static void dump(mp *x)
 103 {
 104   int i, w, n;
 105
 106   fputs("  ", stdout);
 107   w = (MPW_BITS + 3)/4;
 108   n = 1;
 109   while (2 + 2 * n * (4 + w) < 72) n <<= 1;
 110   i = 0;
 111   for (;;) {
 112     printf("0x%0*x", w, x->v[i]);
 113     i++;
 114     if (i >= MP_LEN(x)) break;
 115     fputs(",", stdout);
 116     if (i % n) fputs(" ", stdout); else fputs("\n  ", stdout);
 117   }
 118   fputs("\n", stdout);
 119 }
 120
 121 static void doemit(umax c, int s, int *gg, int *qq)
 122 {
 123   int i;
 124   mp *x = MP_NEW;
 125
 126   for (i = 0; i < n; i++) {
 127     if (cmap[i] == c)
 128       goto found;
 129   }
 130
 131   assert(i < TABSZ);
 132   n = i + 1;
 133   cmap[i] = c;
 134   gmap[i][POS] = gmap[i][NEG] = -1;
 135   if (dumpp) {
 136     MP_FROMINT(x, umax, c);
 137     printf("static mpw guts_%d[] = {\n", q);
 138     dump(x);
 139     fputs("};\n\n", stdout);
 140     MP_DROP(x);
 141   }
 142
 143 found:
 144   *gg = i;
 145   if (gmap[i][s] < 0) {
 146     assert(q < TABSZ);
 147     gmap[i][s] = q;
 148     qmap[q].g = i;
 149     qmap[q].s = s;
 150     q++;
 151   }
 152   *qq = gmap[i][s];
 153 }
 154
 155 static void emit(imax c, int *gg, int *qq)
 156 {
 157   umax uc;
 158   int s;
 159
 160   if (c >= 0) { uc = c; s = POS; }
 161   else { uc = -c; s = NEG; }
 162   doemit(uc, s, gg, qq);
 163 }
 164
 165 static void uemit(umax c, int *gg, int *qq) { doemit(c, POS, gg, qq); }
 166
 167 struct {
 168   const char *name;
 169   imax min;
 170   umax max;
 171   int gmin, gmax;
 172   int qmin, qmax;
 173 } tab[] = {
 174   { "SCHAR",    SCHAR_MIN,      SCHAR_MAX },
 175   { "CHAR",     CHAR_MIN,       CHAR_MAX },
 176   { "UCHAR",    0,              UCHAR_MAX },
 177   { "UINT8",    0,              0xff },
 178   { "SHRT",     SHRT_MIN,       SHRT_MAX },
 179   { "USHRT",    0,              USHRT_MAX },
 180   { "UINT16",   0,              0xffff },
 181   { "INT",      INT_MIN,        INT_MAX },
 182   { "UINT",     0,              UINT_MAX },
 183   { "LONG",     LONG_MIN,       LONG_MAX },
 184   { "ULONG",    0,              ULONG_MAX },
 185   { "UINT32",   0,              0xffffffff },
 186 #ifdef LLONG_MAX
 187   { "LLONG",    LLONG_MIN,      LLONG_MAX },
 188   { "ULLONG",   0,              ULLONG_MAX },
 189 #endif
 190   { "SIZET",    0,              ~(size_t)0 },
 191   { 0 }
 192 };
 193
 194 static void dogen(void)
 195 {
 196   int i;
 197
 198   for (i = 0; tab[i].name; i++) {
 199     if (tab[i].min)
 200       emit(tab[i].min, &tab[i].gmin, &tab[i].qmin);
 201     uemit(tab[i].max, &tab[i].gmax, &tab[i].qmax);
 202   }
 203 }
 204
 205 static void cgen(void)
 206 {
 207   int i;
 208
 209   fputs("\
 210 /* -*-c-*-\n\
 211  *\n\
 212  * C integer limits [generated]\n\
 213  */\n\
 214 \n\
 215 #include \"mplimits.h\"\n\
 216 \n\
 217 #define N(x) (sizeof(x)/sizeof(*x))\n\
 218 #define MPpos(x) { x, x + N(x), N(x), 0, MP_CONST, 0 }\n\
 219 #define MPneg(x) { x, x + N(x), N(x), 0, MP_CONST|MP_NEG, 0 }\n\
 220 \n",
 221         stdout);
 222   dumpp = 1;
 223   dogen();
 224
 225   fputs("mp mp_limits[] = {\n", stdout);
 226   for (i = 0; i < q; i++)
 227     printf("  MP%s(guts_%d),\n", qmap[i].s ? "pos" : "neg", qmap[i].g);
 228   fputs("};\n", stdout);
 229 }
 230
 231 static void hgen(void)
 232 {
 233   int i;
 234
 235   fputs("\
 236 /* -*-c-*-\n\
 237  *\n\
 238  * C integer limits [generated]\n\
 239  */\n\
 240 \n\
 241 #ifndef CATACOMB_MPLIMITS_H\n\
 242 #define CATACOMB_MPLIMITS_H\n\
 243 \n\
 244 #ifndef CATACOMB_MP_H\n\
 245 #  include \"mp.h\"\n\
 246 #endif\n\
 247 \n\
 248 extern mp mp_limits[];\n\
 249 \n",
 250         stdout);
 251   dogen();
 252
 253   for (i = 0; tab[i].name; i++) {
 254     if (tab[i].min) {
 255       printf("#define MP_%s_MIN (&mp_limits[%d])\n",
 256              tab[i].name, gmap[tab[i].qmin][NEG]);
 257     }
 258     printf("#define MP_%s_MAX (&mp_limits[%d])\n",
 259            tab[i].name, gmap[tab[i].qmax][POS]);
 260   }
 261   fputs("\n#endif\n", stdout);
 262 }
 263
 264 int main(int argc, char *argv[])
 265 {
 266   const char *what = argc == 2 ? argv[1] : "<bogus>";
 267
 268   switch (what[0]) {
 269     case 'c': cgen(); break;
 270     case 'h': hgen(); break;
 271     default:
 272       fprintf(stderr, "unknown action `%s'\n", what);
 273       exit(1);
 274   }
 275   if (fflush(stdout) || fclose(stdout)) {
 276     fprintf(stderr, "error writing output: %s\n", strerror(errno));
 277     exit(1);
 278   }
 279   return (0);
 280 }
 281
 282 /*----- That's all, folks -------------------------------------------------*/