gcc/genopinit.c

   1 /* Generate code to initialize optabs from machine description.
   2    Copyright (C) 1993, 94-97, 1998 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include "hconfig.h"
  23 #include "system.h"
  24 #include "rtl.h"
  25 #include "obstack.h"
  26
  27 static struct obstack obstack;
  28 struct obstack *rtl_obstack = &obstack;
  29
  30 #define obstack_chunk_alloc xmalloc
  31 #define obstack_chunk_free free
  32
  33 char *xmalloc PROTO((unsigned));
  34 static void fatal ();
  35 void fancy_abort PROTO((void));
  36
  37 /* Many parts of GCC use arrays that are indexed by machine mode and
  38    contain the insn codes for pattern in the MD file that perform a given
  39    operation on operands of that mode.
  40
  41    These patterns are present in the MD file with names that contain
  42    the mode(s) used and the name of the operation.  This program
  43    writes a function `init_all_optabs' that initializes the optabs with
  44    all the insn codes of the relevant patterns present in the MD file.
  45
  46    This array contains a list of optabs that need to be initialized.  Within
  47    each string, the name of the pattern to be matched against is delimited
  48    with %( and %).  In the string, %a and %b are used to match a short mode
  49    name (the part of the mode name not including `mode' and converted to
  50    lower-case).  When writing out the initializer, the entire string is
  51    used.  %A and %B are replaced with the full name of the mode; %a and %b
  52    are replaced with the short form of the name, as above.
  53
  54    If %N is present in the pattern, it means the two modes must be consecutive
  55    widths in the same mode class (e.g, QImode and HImode).  %I means that
  56    only integer modes should be considered for the next mode, and %F means
  57    that only float modes should be considered.
  58
  59    For some optabs, we store the operation by RTL codes.  These are only
  60    used for comparisons.  In that case, %c and %C are the lower-case and
  61    upper-case forms of the comparison, respectively.  */
  62
  63 /* The reason we use \% is to avoid sequences of the form %-capletter-%
  64    which SCCS treats as magic.  This gets warnings which you should ignore.  */
  65
  66 char *optabs[] =
  67 { "extendtab[(int) %B][(int) %A][0] = CODE_FOR_%(extend%a\%b2%)",
  68   "extendtab[(int) %B][(int) %A][1] = CODE_FOR_%(zero_extend%a\%b2%)",
  69   "fixtab[(int) %A][(int) %B][0] = CODE_FOR_%(fix%F\%a%I\%b2%)",
  70   "fixtab[(int) %A][(int) %B][1] = CODE_FOR_%(fixuns%F\%a%b2%)",
  71   "fixtrunctab[(int) %A][(int) %B][0] = CODE_FOR_%(fix_trunc%F\%a%I\%b2%)",
  72   "fixtrunctab[(int) %A][(int) %B][1] = CODE_FOR_%(fixuns_trunc%F\%a%I\%b2%)",
  73   "floattab[(int) %B][(int) %A][0] = CODE_FOR_%(float%I\%a%F\%b2%)",
  74   "floattab[(int) %B][(int) %A][1] = CODE_FOR_%(floatuns%I\%a%F\%b2%)",
  75   "add_optab->handlers[(int) %A].insn_code = CODE_FOR_%(add%a3%)",
  76   "sub_optab->handlers[(int) %A].insn_code = CODE_FOR_%(sub%a3%)",
  77   "smul_optab->handlers[(int) %A].insn_code = CODE_FOR_%(mul%a3%)",
  78   "umul_highpart_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umul%a3_highpart%)",
  79   "smul_highpart_optab->handlers[(int) %A].insn_code = CODE_FOR_%(smul%a3_highpart%)",
  80   "smul_widen_optab->handlers[(int) %B].insn_code = CODE_FOR_%(mul%a%b3%)%N",
  81   "umul_widen_optab->handlers[(int) %B].insn_code = CODE_FOR_%(umul%a%b3%)%N",
  82   "sdiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(div%I\%a3%)",
  83   "udiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(udiv%I\%a3%)",
  84   "sdivmod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(divmod%a4%)",
  85   "udivmod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(udivmod%a4%)",
  86   "smod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(mod%a3%)",
  87   "umod_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umod%a3%)",
  88   "flodiv_optab->handlers[(int) %A].insn_code = CODE_FOR_%(div%F\%a3%)",
  89   "ftrunc_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ftrunc%F\%a2%)",
  90   "and_optab->handlers[(int) %A].insn_code = CODE_FOR_%(and%a3%)",
  91   "ior_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ior%a3%)",
  92   "xor_optab->handlers[(int) %A].insn_code = CODE_FOR_%(xor%a3%)",
  93   "ashl_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ashl%a3%)",
  94   "ashr_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ashr%a3%)",
  95   "lshr_optab->handlers[(int) %A].insn_code = CODE_FOR_%(lshr%a3%)",
  96   "rotl_optab->handlers[(int) %A].insn_code = CODE_FOR_%(rotl%a3%)",
  97   "rotr_optab->handlers[(int) %A].insn_code = CODE_FOR_%(rotr%a3%)",
  98   "smin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(smin%I\%a3%)",
  99   "smin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(min%F\%a3%)",
 100   "smax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(smax%I\%a3%)",
 101   "smax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(max%F\%a3%)",
 102   "umin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umin%I\%a3%)",
 103   "umax_optab->handlers[(int) %A].insn_code = CODE_FOR_%(umax%I\%a3%)",
 104   "neg_optab->handlers[(int) %A].insn_code = CODE_FOR_%(neg%a2%)",
 105   "abs_optab->handlers[(int) %A].insn_code = CODE_FOR_%(abs%a2%)",
 106   "sqrt_optab->handlers[(int) %A].insn_code = CODE_FOR_%(sqrt%a2%)",
 107   "sin_optab->handlers[(int) %A].insn_code = CODE_FOR_%(sin%a2%)",
 108   "cos_optab->handlers[(int) %A].insn_code = CODE_FOR_%(cos%a2%)",
 109   "strlen_optab->handlers[(int) %A].insn_code = CODE_FOR_%(strlen%a%)",
 110   "one_cmpl_optab->handlers[(int) %A].insn_code = CODE_FOR_%(one_cmpl%a2%)",
 111   "ffs_optab->handlers[(int) %A].insn_code = CODE_FOR_%(ffs%a2%)",
 112   "mov_optab->handlers[(int) %A].insn_code = CODE_FOR_%(mov%a%)",
 113   "movstrict_optab->handlers[(int) %A].insn_code = CODE_FOR_%(movstrict%a%)",
 114   "cmp_optab->handlers[(int) %A].insn_code = CODE_FOR_%(cmp%a%)",
 115   "tst_optab->handlers[(int) %A].insn_code = CODE_FOR_%(tst%a%)",
 116   "bcc_gen_fctn[(int) %C] = gen_%(b%c%)",
 117   "setcc_gen_code[(int) %C] = CODE_FOR_%(s%c%)",
 118   "movcc_gen_code[(int) %A] = CODE_FOR_%(mov%acc%)",
 119   "reload_in_optab[(int) %A] = CODE_FOR_%(reload_in%a%)",
 120   "reload_out_optab[(int) %A] = CODE_FOR_%(reload_out%a%)",
 121   "movstr_optab[(int) %A] = CODE_FOR_%(movstr%a%)",
 122   "clrstr_optab[(int) %A] = CODE_FOR_%(clrstr%a%)" };
 123
 124 /* Allow linking with print-rtl.c.  */
 125 char **insn_name_ptr;
 126
 127 static void gen_insn PROTO((rtx));
 128
 129 static void
 130 gen_insn (insn)
 131      rtx insn;
 132 {
 133   char *name = XSTR (insn, 0);
 134   int m1, m2, op;
 135   size_t pindex;
 136   int i;
 137   char *np, *pp, *p, *q;
 138
 139   /* Don't mention instructions whose names are the null string.
 140      They are in the machine description just to be recognized.  */
 141   if (*name == 0)
 142     return;
 143
 144   /* See if NAME matches one of the patterns we have for the optabs we know
 145      about.  */
 146
 147   for (pindex = 0; pindex < sizeof optabs / sizeof optabs[0]; pindex++)
 148     {
 149       int force_float = 0, force_int = 0;
 150       int force_consec = 0;
 151       int matches = 1;
 152
 153       for (pp = optabs[pindex]; pp[0] != '%' || pp[1] != '('; pp++)
 154         ;
 155
 156       for (pp += 2, np = name; matches && ! (pp[0] == '%' && pp[1] == ')');
 157            pp++)
 158         {
 159           if (*pp != '%')
 160             {
 161               if (*pp != *np++)
 162                 break;
 163             }
 164           else
 165             switch (*++pp)
 166               {
 167               case 'N':
 168                 force_consec = 1;
 169                 break;
 170               case 'I':
 171                 force_int = 1;
 172                 break;
 173               case 'F':
 174                 force_float = 1;
 175                 break;
 176               case 'c':
 177                 for (op = 0; op < NUM_RTX_CODE; op++)
 178                   {
 179                     for (p = rtx_name[op], q = np; *p; p++, q++)
 180                       if (*p != *q)
 181                         break;
 182
 183                     /* We have to be concerned about matching "gt" and
 184                        missing "gtu", e.g., so verify we have reached the
 185                        end of thing we are to match.  */
 186                     if (*p == 0 && *q == 0 && rtx_class[op] == '<')
 187                       break;
 188                   }
 189
 190                 if (op == NUM_RTX_CODE)
 191                   matches = 0;
 192                 else
 193                   np += strlen (rtx_name[op]);
 194                 break;
 195               case 'a':
 196               case 'b':
 197                 /* This loop will stop at the first prefix match, so
 198                    look through the modes in reverse order, in case
 199                    EXTRA_CC_MODES was used and CC is a prefix of the
 200                    CC modes (as it should be).  */
 201                 for (i = ((int) MAX_MACHINE_MODE) - 1; i >= 0; i--)
 202                   {
 203                     for (p = mode_name[i], q = np; *p; p++, q++)
 204                       if (tolower (*p) != *q)
 205                         break;
 206
 207                     if (*p == 0
 208                         && (! force_int || mode_class[i] == MODE_INT)
 209                         && (! force_float || mode_class[i] == MODE_FLOAT))
 210                       break;
 211                   }
 212
 213                 if (i < 0)
 214                   matches = 0;
 215                 else if (*pp == 'a')
 216                   m1 = i, np += strlen (mode_name[i]);
 217                 else
 218                   m2 = i, np += strlen (mode_name[i]);
 219
 220                 force_int = force_float = 0;
 221                 break;
 222
 223               default:
 224                 abort ();
 225               }
 226         }
 227
 228       if (matches && pp[0] == '%' && pp[1] == ')'
 229           && *np == 0
 230           && (! force_consec || (int) GET_MODE_WIDER_MODE(m1) == m2))
 231         break;
 232     }
 233
 234   if (pindex == sizeof optabs / sizeof optabs[0])
 235     return;
 236
 237   /* We found a match.  If this pattern is only conditionally present,
 238      write out the "if" and two extra blanks.  */
 239
 240   if (*XSTR (insn, 2) != 0)
 241     printf ("  if (HAVE_%s)\n  ", name);
 242
 243   printf ("  ");
 244
 245   /* Now write out the initialization, making all required substitutions.  */
 246   for (pp = optabs[pindex]; *pp; pp++)
 247     {
 248       if (*pp != '%')
 249         printf ("%c", *pp);
 250       else
 251         switch (*++pp)
 252           {
 253           case '(':  case ')':
 254           case 'I':  case 'F':  case 'N':
 255             break;
 256           case 'a':
 257             for (np = mode_name[m1]; *np; np++)
 258               printf ("%c", tolower (*np));
 259             break;
 260           case 'b':
 261             for (np = mode_name[m2]; *np; np++)
 262               printf ("%c", tolower (*np));
 263             break;
 264           case 'A':
 265             printf ("%smode", mode_name[m1]);
 266             break;
 267           case 'B':
 268             printf ("%smode", mode_name[m2]);
 269             break;
 270           case 'c':
 271             printf ("%s", rtx_name[op]);
 272             break;
 273           case 'C':
 274             for (np = rtx_name[op]; *np; np++)
 275               printf ("%c", toupper (*np));
 276             break;
 277           }
 278     }
 279
 280   printf (";\n");
 281 }
 282 \f
 283 char *
 284 xmalloc (size)
 285      unsigned size;
 286 {
 287   register char *val = (char *) malloc (size);
 288
 289   if (val == 0)
 290     fatal ("virtual memory exhausted");
 291
 292   return val;
 293 }
 294
 295 char *
 296 xrealloc (ptr, size)
 297      char *ptr;
 298      unsigned size;
 299 {
 300   char *result = (char *) realloc (ptr, size);
 301   if (!result)
 302     fatal ("virtual memory exhausted");
 303   return result;
 304 }
 305
 306 static void
 307 fatal (s, a1, a2)
 308      char *s;
 309 {
 310   fprintf (stderr, "genopinit: ");
 311   fprintf (stderr, s, a1, a2);
 312   fprintf (stderr, "\n");
 313   exit (FATAL_EXIT_CODE);
 314 }
 315
 316 /* More 'friendly' abort that prints the line and file.
 317    config.h can #define abort fancy_abort if you like that sort of thing.  */
 318
 319 void
 320 fancy_abort ()
 321 {
 322   fatal ("Internal gcc abort.");
 323 }
 324 \f
 325 int
 326 main (argc, argv)
 327      int argc;
 328      char **argv;
 329 {
 330   rtx desc;
 331   FILE *infile;
 332   register int c;
 333
 334   obstack_init (rtl_obstack);
 335
 336   if (argc <= 1)
 337     fatal ("No input file name.");
 338
 339   infile = fopen (argv[1], "r");
 340   if (infile == 0)
 341     {
 342       perror (argv[1]);
 343       exit (FATAL_EXIT_CODE);
 344     }
 345
 346   init_rtl ();
 347
 348   printf ("/* Generated automatically by the program `genopinit'\n\
 349 from the machine description file `md'.  */\n\n");
 350
 351   printf ("#include \"config.h\"\n");
 352   printf ("#include \"system.h\"\n");
 353   printf ("#include \"rtl.h\"\n");
 354   printf ("#include \"flags.h\"\n");
 355   printf ("#include \"insn-flags.h\"\n");
 356   printf ("#include \"insn-codes.h\"\n");
 357   printf ("#include \"insn-config.h\"\n");
 358   printf ("#include \"recog.h\"\n");
 359   printf ("#include \"expr.h\"\n");
 360   printf ("#include \"reload.h\"\n\n");
 361
 362   printf ("void\ninit_all_optabs ()\n{\n");
 363
 364   /* Read the machine description.  */
 365
 366   while (1)
 367     {
 368       c = read_skip_spaces (infile);
 369       if (c == EOF)
 370         break;
 371       ungetc (c, infile);
 372
 373       desc = read_rtx (infile);
 374       if (GET_CODE (desc) == DEFINE_INSN || GET_CODE (desc) == DEFINE_EXPAND)
 375         gen_insn (desc);
 376     }
 377
 378   printf ("}\n");
 379
 380   fflush (stdout);
 381   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 382   /* NOTREACHED */
 383   return 0;
 384 }