gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 88, 91, 94, 95, 1997 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 <stdio.h>
  23 #include "hconfig.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 extern void free ();
  34 extern rtx read_rtx ();
  35
  36 char *xmalloc ();
  37 static void fatal ();
  38 void fancy_abort ();
  39
  40 static int max_opno;
  41 static int max_dup_opno;
  42 static int register_constraints;
  43 static int insn_code_number;
  44 static int insn_index_number;
  45
  46 /* Data structure for recording the patterns of insns that have CLOBBERs.
  47    We use this to output a function that adds these CLOBBERs to a
  48    previously-allocated PARALLEL expression.  */
  49
  50 struct clobber_pat
  51 {
  52   struct clobber_ent *insns;
  53   rtx pattern;
  54   int first_clobber;
  55   struct clobber_pat *next;
  56 } *clobber_list;
  57
  58 /* Records one insn that uses the clobber list.  */
  59
  60 struct clobber_ent
  61 {
  62   int code_number;              /* Counts only insns.  */
  63   struct clobber_ent *next;
  64 };
  65
  66 static void
  67 max_operand_1 (x)
  68      rtx x;
  69 {
  70   register RTX_CODE code;
  71   register int i;
  72   register int len;
  73   register char *fmt;
  74
  75   if (x == 0)
  76     return;
  77
  78   code = GET_CODE (x);
  79
  80   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  81     register_constraints = 1;
  82   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  83     register_constraints = 1;
  84   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  85       || code == MATCH_PARALLEL)
  86     max_opno = MAX (max_opno, XINT (x, 0));
  87   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  88     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  89
  90   fmt = GET_RTX_FORMAT (code);
  91   len = GET_RTX_LENGTH (code);
  92   for (i = 0; i < len; i++)
  93     {
  94       if (fmt[i] == 'e' || fmt[i] == 'u')
  95         max_operand_1 (XEXP (x, i));
  96       else if (fmt[i] == 'E')
  97         {
  98           int j;
  99           for (j = 0; j < XVECLEN (x, i); j++)
 100             max_operand_1 (XVECEXP (x, i, j));
 101         }
 102     }
 103 }
 104
 105 static int
 106 max_operand_vec (insn, arg)
 107      rtx insn;
 108      int arg;
 109 {
 110   register int len = XVECLEN (insn, arg);
 111   register int i;
 112
 113   max_opno = -1;
 114   max_dup_opno = -1;
 115
 116   for (i = 0; i < len; i++)
 117     max_operand_1 (XVECEXP (insn, arg, i));
 118
 119   return max_opno + 1;
 120 }
 121 \f
 122 static void
 123 print_code (code)
 124      RTX_CODE code;
 125 {
 126   register char *p1;
 127   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 128     {
 129       if (*p1 >= 'a' && *p1 <= 'z')
 130         putchar (*p1 + 'A' - 'a');
 131       else
 132         putchar (*p1);
 133     }
 134 }
 135
 136 /* Print a C expression to construct an RTX just like X,
 137    substituting any operand references appearing within.  */
 138
 139 static void
 140 gen_exp (x)
 141      rtx x;
 142 {
 143   register RTX_CODE code;
 144   register int i;
 145   register int len;
 146   register char *fmt;
 147
 148   if (x == 0)
 149     {
 150       printf ("NULL_RTX");
 151       return;
 152     }
 153
 154   code = GET_CODE (x);
 155
 156   switch (code)
 157     {
 158     case MATCH_OPERAND:
 159     case MATCH_DUP:
 160       printf ("operand%d", XINT (x, 0));
 161       return;
 162
 163     case MATCH_OP_DUP:
 164       printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
 165               XINT (x, 0), XINT (x, 0));
 166       for (i = 0; i < XVECLEN (x, 1); i++)
 167         {
 168           printf (",\n\t\t");
 169           gen_exp (XVECEXP (x, 1, i));
 170         }
 171       printf (")");
 172       return;
 173
 174     case MATCH_OPERATOR:
 175       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 176       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 177       for (i = 0; i < XVECLEN (x, 2); i++)
 178         {
 179           printf (",\n\t\t");
 180           gen_exp (XVECEXP (x, 2, i));
 181         }
 182       printf (")");
 183       return;
 184
 185     case MATCH_PARALLEL:
 186     case MATCH_PAR_DUP:
 187       printf ("operand%d", XINT (x, 0));
 188       return;
 189
 190     case MATCH_SCRATCH:
 191       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 192       return;
 193
 194     case ADDRESS:
 195       fatal ("ADDRESS expression code used in named instruction pattern");
 196
 197     case PC:
 198       printf ("pc_rtx");
 199       return;
 200
 201     case CC0:
 202       printf ("cc0_rtx");
 203       return;
 204
 205     case CONST_INT:
 206       if (INTVAL (x) == 0)
 207         printf ("const0_rtx");
 208       else if (INTVAL (x) == 1)
 209         printf ("const1_rtx");
 210       else if (INTVAL (x) == -1)
 211         printf ("constm1_rtx");
 212       else if (INTVAL (x) == STORE_FLAG_VALUE)
 213         printf ("const_true_rtx");
 214       else
 215         printf (
 216 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
 217                 "GEN_INT (%d)",
 218 #else
 219                 "GEN_INT (%ld)",
 220 #endif
 221                 INTVAL (x));
 222       return;
 223
 224     case CONST_DOUBLE:
 225       /* These shouldn't be written in MD files.  Instead, the appropriate
 226          routines in varasm.c should be called.  */
 227       abort ();
 228
 229     default:
 230       break;
 231     }
 232
 233   printf ("gen_rtx_");
 234   print_code (code);
 235   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 236
 237   fmt = GET_RTX_FORMAT (code);
 238   len = GET_RTX_LENGTH (code);
 239   for (i = 0; i < len; i++)
 240     {
 241       if (fmt[i] == '0')
 242         break;
 243       printf (",\n\t");
 244       if (fmt[i] == 'e' || fmt[i] == 'u')
 245         gen_exp (XEXP (x, i));
 246       else if (fmt[i] == 'i')
 247         printf ("%u", XINT (x, i));
 248       else if (fmt[i] == 's')
 249         printf ("\"%s\"", XSTR (x, i));
 250       else if (fmt[i] == 'E')
 251         {
 252           int j;
 253           printf ("gen_rtvec (%d", XVECLEN (x, i));
 254           for (j = 0; j < XVECLEN (x, i); j++)
 255             {
 256               printf (",\n\t\t");
 257               gen_exp (XVECEXP (x, i, j));
 258             }
 259           printf (")");
 260         }
 261       else
 262         abort ();
 263     }
 264   printf (")");
 265 }
 266 \f
 267 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 268
 269 static void
 270 gen_insn (insn)
 271      rtx insn;
 272 {
 273   int operands;
 274   register int i;
 275
 276   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 277      registers or MATCH_SCRATCHes.  If so, store away the information for
 278      later.  */
 279
 280   if (XVEC (insn, 1))
 281     {
 282       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 283         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 284             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 285                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 286           break;
 287
 288       if (i != XVECLEN (insn, 1) - 1)
 289         {
 290           register struct clobber_pat *p;
 291           register struct clobber_ent *link
 292             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 293           register int j;
 294
 295           link->code_number = insn_code_number;
 296
 297           /* See if any previous CLOBBER_LIST entry is the same as this
 298              one.  */
 299
 300           for (p = clobber_list; p; p = p->next)
 301             {
 302               if (p->first_clobber != i + 1
 303                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 304                 continue;
 305
 306               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 307                 {
 308                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 309                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 310
 311                   /* OLD and NEW are the same if both are to be a SCRATCH
 312                      of the same mode,
 313                      or if both are registers of the same mode and number.  */
 314                   if (! (GET_MODE (old) == GET_MODE (new)
 315                          && ((GET_CODE (old) == MATCH_SCRATCH
 316                               && GET_CODE (new) == MATCH_SCRATCH)
 317                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 318                                  && REGNO (old) == REGNO (new)))))
 319                     break;
 320                 }
 321
 322               if (j == XVECLEN (insn, 1))
 323                 break;
 324             }
 325
 326           if (p == 0)
 327             {
 328               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 329
 330               p->insns = 0;
 331               p->pattern = insn;
 332               p->first_clobber = i + 1;
 333               p->next = clobber_list;
 334               clobber_list = p;
 335             }
 336
 337           link->next = p->insns;
 338           p->insns = link;
 339         }
 340     }
 341
 342   /* Don't mention instructions whose names are the null string
 343      or begin with '*'.  They are in the machine description just
 344      to be recognized.  */
 345   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 346     return;
 347
 348   /* Find out how many operands this function has,
 349      and also whether any of them have register constraints.  */
 350   register_constraints = 0;
 351   operands = max_operand_vec (insn, 1);
 352   if (max_dup_opno >= operands)
 353     fatal ("match_dup operand number has no match_operand");
 354
 355   /* Output the function name and argument declarations.  */
 356   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 357   for (i = 0; i < operands; i++)
 358     printf (i ? ", operand%d" : "operand%d", i);
 359   printf (")\n");
 360   for (i = 0; i < operands; i++)
 361     printf ("     rtx operand%d;\n", i);
 362   printf ("{\n");
 363
 364   /* Output code to construct and return the rtl for the instruction body */
 365
 366   if (XVECLEN (insn, 1) == 1)
 367     {
 368       printf ("  return ");
 369       gen_exp (XVECEXP (insn, 1, 0));
 370       printf (";\n}\n\n");
 371     }
 372   else
 373     {
 374       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
 375       for (i = 0; i < XVECLEN (insn, 1); i++)
 376         {
 377           printf (",\n\t\t");
 378           gen_exp (XVECEXP (insn, 1, i));
 379         }
 380       printf ("));\n}\n\n");
 381     }
 382 }
 383 \f
 384 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 385
 386 static void
 387 gen_expand (expand)
 388      rtx expand;
 389 {
 390   int operands;
 391   register int i;
 392
 393   if (strlen (XSTR (expand, 0)) == 0)
 394     fatal ("define_expand lacks a name");
 395   if (XVEC (expand, 1) == 0)
 396     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 397
 398   /* Find out how many operands this function has,
 399      and also whether any of them have register constraints.  */
 400   register_constraints = 0;
 401
 402   operands = max_operand_vec (expand, 1);
 403
 404   /* Output the function name and argument declarations.  */
 405   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 406   for (i = 0; i < operands; i++)
 407     printf (i ? ", operand%d" : "operand%d", i);
 408   printf (")\n");
 409   for (i = 0; i < operands; i++)
 410     printf ("     rtx operand%d;\n", i);
 411   printf ("{\n");
 412
 413   /* If we don't have any C code to write, only one insn is being written,
 414      and no MATCH_DUPs are present, we can just return the desired insn
 415      like we do for a DEFINE_INSN.  This saves memory.  */
 416   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 417       && operands > max_dup_opno
 418       && XVECLEN (expand, 1) == 1)
 419     {
 420       printf ("  return ");
 421       gen_exp (XVECEXP (expand, 1, 0));
 422       printf (";\n}\n\n");
 423       return;
 424     }
 425
 426   /* For each operand referred to only with MATCH_DUPs,
 427      make a local variable.  */
 428   for (i = operands; i <= max_dup_opno; i++)
 429     printf ("  rtx operand%d;\n", i);
 430   if (operands > 0 || max_dup_opno >= 0)
 431     printf ("  rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
 432   printf ("  rtx _val = 0;\n");
 433   printf ("  start_sequence ();\n");
 434
 435   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 436      before the actual construction.
 437      This code expects to refer to `operands'
 438      just as the output-code in a DEFINE_INSN does,
 439      but here `operands' is an automatic array.
 440      So copy the operand values there before executing it.  */
 441   if (XSTR (expand, 3) && *XSTR (expand, 3))
 442     {
 443       /* Output code to copy the arguments into `operands'.  */
 444       for (i = 0; i < operands; i++)
 445         printf ("  operands[%d] = operand%d;\n", i, i);
 446
 447       /* Output the special code to be executed before the sequence
 448          is generated.  */
 449       printf ("%s\n", XSTR (expand, 3));
 450
 451       /* Output code to copy the arguments back out of `operands'
 452          (unless we aren't going to use them at all).  */
 453       if (XVEC (expand, 1) != 0)
 454         {
 455           for (i = 0; i < operands; i++)
 456             printf ("  operand%d = operands[%d];\n", i, i);
 457           for (; i <= max_dup_opno; i++)
 458             printf ("  operand%d = operands[%d];\n", i, i);
 459         }
 460     }
 461
 462   /* Output code to construct the rtl for the instruction bodies.
 463      Use emit_insn to add them to the sequence being accumulated.
 464      But don't do this if the user's code has set `no_more' nonzero.  */
 465
 466   for (i = 0; i < XVECLEN (expand, 1); i++)
 467     {
 468       rtx next = XVECEXP (expand, 1, i);
 469       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 470           || (GET_CODE (next) == PARALLEL
 471               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 472               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 473           || GET_CODE (next) == RETURN)
 474         printf ("  emit_jump_insn (");
 475       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 476                || GET_CODE (next) == CALL
 477                || (GET_CODE (next) == PARALLEL
 478                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 479                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 480                || (GET_CODE (next) == PARALLEL
 481                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 482         printf ("  emit_call_insn (");
 483       else if (GET_CODE (next) == CODE_LABEL)
 484         printf ("  emit_label (");
 485       else if (GET_CODE (next) == MATCH_OPERAND
 486                || GET_CODE (next) == MATCH_OPERATOR
 487                || GET_CODE (next) == MATCH_PARALLEL
 488                || GET_CODE (next) == MATCH_OP_DUP
 489                || GET_CODE (next) == MATCH_DUP
 490                || GET_CODE (next) == PARALLEL)
 491         printf ("  emit (");
 492       else
 493         printf ("  emit_insn (");
 494       gen_exp (next);
 495       printf (");\n");
 496       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 497           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 498         printf ("  emit_barrier ();");
 499     }
 500
 501   /* Call `gen_sequence' to make a SEQUENCE out of all the
 502      insns emitted within this gen_... function.  */
 503
 504   printf (" _done:\n");
 505   printf ("  _val = gen_sequence ();\n");
 506   printf (" _fail:\n");
 507   printf ("  end_sequence ();\n");
 508   printf ("  return _val;\n}\n\n");
 509 }
 510
 511 /* Like gen_expand, but generates a SEQUENCE.  */
 512
 513 static void
 514 gen_split (split)
 515      rtx split;
 516 {
 517   register int i;
 518   int operands;
 519
 520   if (XVEC (split, 0) == 0)
 521     fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
 522   else if (XVEC (split, 2) == 0)
 523     fatal ("define_split (definition %d) lacks a replacement pattern",
 524            insn_index_number);
 525
 526   /* Find out how many operands this function has.  */
 527
 528   max_operand_vec (split, 2);
 529   operands = MAX (max_opno, max_dup_opno) + 1;
 530
 531   /* Output the function name and argument declarations.  */
 532   printf ("rtx\ngen_split_%d (operands)\n     rtx *operands;\n",
 533           insn_code_number);
 534   printf ("{\n");
 535
 536   /* Declare all local variables.  */
 537   for (i = 0; i < operands; i++)
 538     printf ("  rtx operand%d;\n", i);
 539   printf ("  rtx _val = 0;\n");
 540   printf ("  start_sequence ();\n");
 541
 542   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 543      before the actual construction.  */
 544
 545   if (XSTR (split, 3))
 546     printf ("%s\n", XSTR (split, 3));
 547
 548   /* Output code to copy the arguments back out of `operands'  */
 549   for (i = 0; i < operands; i++)
 550     printf ("  operand%d = operands[%d];\n", i, i);
 551
 552   /* Output code to construct the rtl for the instruction bodies.
 553      Use emit_insn to add them to the sequence being accumulated.
 554      But don't do this if the user's code has set `no_more' nonzero.  */
 555
 556   for (i = 0; i < XVECLEN (split, 2); i++)
 557     {
 558       rtx next = XVECEXP (split, 2, i);
 559       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 560           || (GET_CODE (next) == PARALLEL
 561               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 562               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 563           || GET_CODE (next) == RETURN)
 564         printf ("  emit_jump_insn (");
 565       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 566                || GET_CODE (next) == CALL
 567                || (GET_CODE (next) == PARALLEL
 568                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 569                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 570                || (GET_CODE (next) == PARALLEL
 571                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 572         printf ("  emit_call_insn (");
 573       else if (GET_CODE (next) == CODE_LABEL)
 574         printf ("  emit_label (");
 575       else if (GET_CODE (next) == MATCH_OPERAND
 576                || GET_CODE (next) == MATCH_OPERATOR
 577                || GET_CODE (next) == MATCH_PARALLEL
 578                || GET_CODE (next) == MATCH_OP_DUP
 579                || GET_CODE (next) == MATCH_DUP
 580                || GET_CODE (next) == PARALLEL)
 581         printf ("  emit (");
 582       else
 583         printf ("  emit_insn (");
 584       gen_exp (next);
 585       printf (");\n");
 586       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 587           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 588         printf ("  emit_barrier ();");
 589     }
 590
 591   /* Call `gen_sequence' to make a SEQUENCE out of all the
 592      insns emitted within this gen_... function.  */
 593
 594   printf (" _done:\n");
 595   printf ("  _val = gen_sequence ();\n");
 596   printf (" _fail:\n");
 597   printf ("  end_sequence ();\n");
 598   printf ("  return _val;\n}\n\n");
 599 }
 600 \f
 601 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 602    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 603    the end of the vector.  */
 604
 605 static void
 606 output_add_clobbers ()
 607 {
 608   struct clobber_pat *clobber;
 609   struct clobber_ent *ent;
 610   int i;
 611
 612   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 613   printf ("     rtx pattern;\n     int insn_code_number;\n");
 614   printf ("{\n");
 615   printf ("  int i;\n\n");
 616   printf ("  switch (insn_code_number)\n");
 617   printf ("    {\n");
 618
 619   for (clobber = clobber_list; clobber; clobber = clobber->next)
 620     {
 621       for (ent = clobber->insns; ent; ent = ent->next)
 622         printf ("    case %d:\n", ent->code_number);
 623
 624       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 625         {
 626           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 627           gen_exp (XVECEXP (clobber->pattern, 1, i));
 628           printf (";\n");
 629         }
 630
 631       printf ("      break;\n\n");
 632     }
 633
 634   printf ("    default:\n");
 635   printf ("      abort ();\n");
 636   printf ("    }\n");
 637   printf ("}\n");
 638 }
 639 \f
 640 /* Write a function, init_mov_optab, that is called to set up entries
 641    in mov_optab for EXTRA_CC_MODES.  */
 642
 643 static void
 644 output_init_mov_optab ()
 645 {
 646 #ifdef EXTRA_CC_NAMES
 647   static char *cc_names[] = { EXTRA_CC_NAMES };
 648   char *p;
 649   int i;
 650
 651   printf ("\nvoid\ninit_mov_optab ()\n{\n");
 652
 653   for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
 654     {
 655       printf ("#ifdef HAVE_mov");
 656       for (p = cc_names[i]; *p; p++)
 657         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 658       printf ("\n");
 659       printf ("  if (HAVE_mov");
 660       for (p = cc_names[i]; *p; p++)
 661         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 662       printf (")\n");
 663       printf ("    mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
 664               cc_names[i]);
 665       for (p = cc_names[i]; *p; p++)
 666         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 667       printf (";\n#endif\n");
 668     }
 669
 670   printf ("}\n");
 671 #endif
 672 }
 673 \f
 674 char *
 675 xmalloc (size)
 676      unsigned size;
 677 {
 678   register char *val = (char *) malloc (size);
 679
 680   if (val == 0)
 681     fatal ("virtual memory exhausted");
 682
 683   return val;
 684 }
 685
 686 char *
 687 xrealloc (ptr, size)
 688      char *ptr;
 689      unsigned size;
 690 {
 691   char *result = (char *) realloc (ptr, size);
 692   if (!result)
 693     fatal ("virtual memory exhausted");
 694   return result;
 695 }
 696
 697 static void
 698 fatal (s, a1, a2)
 699      char *s;
 700 {
 701   fprintf (stderr, "genemit: ");
 702   fprintf (stderr, s, a1, a2);
 703   fprintf (stderr, "\n");
 704   exit (FATAL_EXIT_CODE);
 705 }
 706
 707 /* More 'friendly' abort that prints the line and file.
 708    config.h can #define abort fancy_abort if you like that sort of thing.  */
 709
 710 void
 711 fancy_abort ()
 712 {
 713   fatal ("Internal gcc abort.");
 714 }
 715 \f
 716 int
 717 main (argc, argv)
 718      int argc;
 719      char **argv;
 720 {
 721   rtx desc;
 722   FILE *infile;
 723   register int c;
 724
 725   obstack_init (rtl_obstack);
 726
 727   if (argc <= 1)
 728     fatal ("No input file name.");
 729
 730   infile = fopen (argv[1], "r");
 731   if (infile == 0)
 732     {
 733       perror (argv[1]);
 734       exit (FATAL_EXIT_CODE);
 735     }
 736
 737   init_rtl ();
 738
 739   /* Assign sequential codes to all entries in the machine description
 740      in parallel with the tables in insn-output.c.  */
 741
 742   insn_code_number = 0;
 743   insn_index_number = 0;
 744
 745   printf ("/* Generated automatically by the program `genemit'\n\
 746 from the machine description file `md'.  */\n\n");
 747
 748   printf ("#include \"config.h\"\n");
 749   printf ("#include <stdio.h>\n");
 750   printf ("#include \"rtl.h\"\n");
 751   printf ("#include \"expr.h\"\n");
 752   printf ("#include \"real.h\"\n");
 753   printf ("#include \"flags.h\"\n");
 754   printf ("#include \"output.h\"\n");
 755   printf ("#include \"insn-config.h\"\n\n");
 756   printf ("#include \"insn-flags.h\"\n\n");
 757   printf ("#include \"insn-codes.h\"\n\n");
 758   printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
 759   printf ("extern rtx recog_operand[];\n");
 760   printf ("#define operands emit_operand\n\n");
 761   printf ("#define FAIL goto _fail\n\n");
 762   printf ("#define DONE goto _done\n\n");
 763
 764   /* Read the machine description.  */
 765
 766   while (1)
 767     {
 768       c = read_skip_spaces (infile);
 769       if (c == EOF)
 770         break;
 771       ungetc (c, infile);
 772
 773       desc = read_rtx (infile);
 774       if (GET_CODE (desc) == DEFINE_INSN)
 775         {
 776           gen_insn (desc);
 777           ++insn_code_number;
 778         }
 779       if (GET_CODE (desc) == DEFINE_EXPAND)
 780         {
 781           gen_expand (desc);
 782           ++insn_code_number;
 783         }
 784       if (GET_CODE (desc) == DEFINE_SPLIT)
 785         {
 786           gen_split (desc);
 787           ++insn_code_number;
 788         }
 789       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
 790         {
 791           ++insn_code_number;
 792         }
 793       ++insn_index_number;
 794     }
 795
 796   /* Write out the routine to add CLOBBERs to a pattern.  */
 797   output_add_clobbers ();
 798
 799   /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES.  */
 800   output_init_mov_optab ();
 801
 802   fflush (stdout);
 803   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 804   /* NOTREACHED */
 805   return 0;
 806 }