gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 1988, 1991, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #include <stdio.h>
  22 #include "hconfig.h"
  23 #include "rtl.h"
  24 #include "obstack.h"
  25
  26 static struct obstack obstack;
  27 struct obstack *rtl_obstack = &obstack;
  28
  29 #define obstack_chunk_alloc xmalloc
  30 #define obstack_chunk_free free
  31
  32 extern void free ();
  33 extern rtx read_rtx ();
  34
  35 char *xmalloc ();
  36 static void fatal ();
  37 void fancy_abort ();
  38
  39 static int max_opno;
  40 static int max_dup_opno;
  41 static int register_constraints;
  42 static int insn_code_number;
  43 static int insn_index_number;
  44
  45 /* Data structure for recording the patterns of insns that have CLOBBERs.
  46    We use this to output a function that adds these CLOBBERs to a
  47    previously-allocated PARALLEL expression.  */
  48
  49 struct clobber_pat
  50 {
  51   struct clobber_ent *insns;
  52   rtx pattern;
  53   int first_clobber;
  54   struct clobber_pat *next;
  55 } *clobber_list;
  56
  57 /* Records one insn that uses the clobber list.  */
  58
  59 struct clobber_ent
  60 {
  61   int code_number;              /* Counts only insns.  */
  62   struct clobber_ent *next;
  63 };
  64
  65 static void
  66 max_operand_1 (x)
  67      rtx x;
  68 {
  69   register RTX_CODE code;
  70   register int i;
  71   register int len;
  72   register char *fmt;
  73
  74   if (x == 0)
  75     return;
  76
  77   code = GET_CODE (x);
  78
  79   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  80     register_constraints = 1;
  81   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  82     register_constraints = 1;
  83   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  84       || code == MATCH_PARALLEL)
  85     max_opno = MAX (max_opno, XINT (x, 0));
  86   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  87     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  88
  89   fmt = GET_RTX_FORMAT (code);
  90   len = GET_RTX_LENGTH (code);
  91   for (i = 0; i < len; i++)
  92     {
  93       if (fmt[i] == 'e' || fmt[i] == 'u')
  94         max_operand_1 (XEXP (x, i));
  95       else if (fmt[i] == 'E')
  96         {
  97           int j;
  98           for (j = 0; j < XVECLEN (x, i); j++)
  99             max_operand_1 (XVECEXP (x, i, j));
 100         }
 101     }
 102 }
 103
 104 static int
 105 max_operand_vec (insn, arg)
 106      rtx insn;
 107      int arg;
 108 {
 109   register int len = XVECLEN (insn, arg);
 110   register int i;
 111
 112   max_opno = -1;
 113   max_dup_opno = -1;
 114
 115   for (i = 0; i < len; i++)
 116     max_operand_1 (XVECEXP (insn, arg, i));
 117
 118   return max_opno + 1;
 119 }
 120 \f
 121 static void
 122 print_code (code)
 123      RTX_CODE code;
 124 {
 125   register char *p1;
 126   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 127     {
 128       if (*p1 >= 'a' && *p1 <= 'z')
 129         putchar (*p1 + 'A' - 'a');
 130       else
 131         putchar (*p1);
 132     }
 133 }
 134
 135 /* Print a C expression to construct an RTX just like X,
 136    substituting any operand references appearing within.  */
 137
 138 static void
 139 gen_exp (x)
 140      rtx x;
 141 {
 142   register RTX_CODE code;
 143   register int i;
 144   register int len;
 145   register char *fmt;
 146
 147   if (x == 0)
 148     {
 149       printf ("NULL_RTX");
 150       return;
 151     }
 152
 153   code = GET_CODE (x);
 154
 155   switch (code)
 156     {
 157     case MATCH_OPERAND:
 158     case MATCH_DUP:
 159       printf ("operand%d", XINT (x, 0));
 160       return;
 161
 162     case MATCH_OP_DUP:
 163       printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
 164               XINT (x, 0), XINT (x, 0));
 165       for (i = 0; i < XVECLEN (x, 1); i++)
 166         {
 167           printf (",\n\t\t");
 168           gen_exp (XVECEXP (x, 1, i));
 169         }
 170       printf (")");
 171       return;
 172
 173     case MATCH_OPERATOR:
 174       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 175       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 176       for (i = 0; i < XVECLEN (x, 2); i++)
 177         {
 178           printf (",\n\t\t");
 179           gen_exp (XVECEXP (x, 2, i));
 180         }
 181       printf (")");
 182       return;
 183
 184     case MATCH_PARALLEL:
 185     case MATCH_PAR_DUP:
 186       printf ("operand%d", XINT (x, 0));
 187       return;
 188
 189     case MATCH_SCRATCH:
 190       printf ("gen_rtx (SCRATCH, %smode, 0)", GET_MODE_NAME (GET_MODE (x)));
 191       return;
 192
 193     case ADDRESS:
 194       fatal ("ADDRESS expression code used in named instruction pattern");
 195
 196     case PC:
 197       printf ("pc_rtx");
 198       return;
 199
 200     case CC0:
 201       printf ("cc0_rtx");
 202       return;
 203
 204     case CONST_INT:
 205       if (INTVAL (x) == 0)
 206         printf ("const0_rtx");
 207       else if (INTVAL (x) == 1)
 208         printf ("const1_rtx");
 209       else if (INTVAL (x) == -1)
 210         printf ("constm1_rtx");
 211       else if (INTVAL (x) == STORE_FLAG_VALUE)
 212         printf ("const_true_rtx");
 213       else
 214         printf (
 215 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
 216                 "GEN_INT (%d)",
 217 #else
 218                 "GEN_INT (%ld)",
 219 #endif
 220                 INTVAL (x));
 221       return;
 222
 223     case CONST_DOUBLE:
 224       /* These shouldn't be written in MD files.  Instead, the appropriate
 225          routines in varasm.c should be called.  */
 226       abort ();
 227     }
 228
 229   printf ("gen_rtx (");
 230   print_code (code);
 231   printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 232
 233   fmt = GET_RTX_FORMAT (code);
 234   len = GET_RTX_LENGTH (code);
 235   for (i = 0; i < len; i++)
 236     {
 237       if (fmt[i] == '0')
 238         break;
 239       printf (",\n\t");
 240       if (fmt[i] == 'e' || fmt[i] == 'u')
 241         gen_exp (XEXP (x, i));
 242       else if (fmt[i] == 'i')
 243         printf ("%u", XINT (x, i));
 244       else if (fmt[i] == 's')
 245         printf ("\"%s\"", XSTR (x, i));
 246       else if (fmt[i] == 'E')
 247         {
 248           int j;
 249           printf ("gen_rtvec (%d", XVECLEN (x, i));
 250           for (j = 0; j < XVECLEN (x, i); j++)
 251             {
 252               printf (",\n\t\t");
 253               gen_exp (XVECEXP (x, i, j));
 254             }
 255           printf (")");
 256         }
 257       else
 258         abort ();
 259     }
 260   printf (")");
 261 }
 262 \f
 263 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 264
 265 static void
 266 gen_insn (insn)
 267      rtx insn;
 268 {
 269   int operands;
 270   register int i;
 271
 272   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 273      registers or MATCH_SCRATCHes.  If so, store away the information for
 274      later. */
 275
 276   if (XVEC (insn, 1))
 277     {
 278       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 279         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 280             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 281                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 282           break;
 283
 284       if (i != XVECLEN (insn, 1) - 1)
 285         {
 286           register struct clobber_pat *p;
 287           register struct clobber_ent *link
 288             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 289           register int j;
 290
 291           link->code_number = insn_code_number;
 292
 293           /* See if any previous CLOBBER_LIST entry is the same as this
 294              one.  */
 295
 296           for (p = clobber_list; p; p = p->next)
 297             {
 298               if (p->first_clobber != i + 1
 299                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 300                 continue;
 301
 302               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 303                 {
 304                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 305                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 306
 307                   /* OLD and NEW are the same if both are to be a SCRATCH
 308                      of the same mode,
 309                      or if both are registers of the same mode and number.  */
 310                   if (! (GET_MODE (old) == GET_MODE (new)
 311                          && ((GET_CODE (old) == MATCH_SCRATCH
 312                               && GET_CODE (new) == MATCH_SCRATCH)
 313                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 314                                  && REGNO (old) == REGNO (new)))))
 315                     break;
 316                 }
 317
 318               if (j == XVECLEN (insn, 1))
 319                 break;
 320             }
 321
 322           if (p == 0)
 323             {
 324               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 325
 326               p->insns = 0;
 327               p->pattern = insn;
 328               p->first_clobber = i + 1;
 329               p->next = clobber_list;
 330               clobber_list = p;
 331             }
 332
 333           link->next = p->insns;
 334           p->insns = link;
 335         }
 336     }
 337
 338   /* Don't mention instructions whose names are the null string
 339      or begin with '*'.  They are in the machine description just
 340      to be recognized.  */
 341   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 342     return;
 343
 344   /* Find out how many operands this function has,
 345      and also whether any of them have register constraints.  */
 346   register_constraints = 0;
 347   operands = max_operand_vec (insn, 1);
 348   if (max_dup_opno >= operands)
 349     fatal ("match_dup operand number has no match_operand");
 350
 351   /* Output the function name and argument declarations.  */
 352   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 353   for (i = 0; i < operands; i++)
 354     printf (i ? ", operand%d" : "operand%d", i);
 355   printf (")\n");
 356   for (i = 0; i < operands; i++)
 357     printf ("     rtx operand%d;\n", i);
 358   printf ("{\n");
 359
 360   /* Output code to construct and return the rtl for the instruction body */
 361
 362   if (XVECLEN (insn, 1) == 1)
 363     {
 364       printf ("  return ");
 365       gen_exp (XVECEXP (insn, 1, 0));
 366       printf (";\n}\n\n");
 367     }
 368   else
 369     {
 370       printf ("  return gen_rtx (PARALLEL, VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
 371       for (i = 0; i < XVECLEN (insn, 1); i++)
 372         {
 373           printf (",\n\t\t");
 374           gen_exp (XVECEXP (insn, 1, i));
 375         }
 376       printf ("));\n}\n\n");
 377     }
 378 }
 379 \f
 380 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 381
 382 static void
 383 gen_expand (expand)
 384      rtx expand;
 385 {
 386   int operands;
 387   register int i;
 388
 389   if (strlen (XSTR (expand, 0)) == 0)
 390     fatal ("define_expand lacks a name");
 391   if (XVEC (expand, 1) == 0)
 392     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 393
 394   /* Find out how many operands this function has,
 395      and also whether any of them have register constraints.  */
 396   register_constraints = 0;
 397
 398   operands = max_operand_vec (expand, 1);
 399
 400   /* Output the function name and argument declarations.  */
 401   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 402   for (i = 0; i < operands; i++)
 403     printf (i ? ", operand%d" : "operand%d", i);
 404   printf (")\n");
 405   for (i = 0; i < operands; i++)
 406     printf ("     rtx operand%d;\n", i);
 407   printf ("{\n");
 408
 409   /* If we don't have any C code to write, only one insn is being written,
 410      and no MATCH_DUPs are present, we can just return the desired insn
 411      like we do for a DEFINE_INSN.  This saves memory.  */
 412   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 413       && operands > max_dup_opno
 414       && XVECLEN (expand, 1) == 1)
 415     {
 416       printf ("  return ");
 417       gen_exp (XVECEXP (expand, 1, 0));
 418       printf (";\n}\n\n");
 419       return;
 420     }
 421
 422   /* For each operand referred to only with MATCH_DUPs,
 423      make a local variable.  */
 424   for (i = operands; i <= max_dup_opno; i++)
 425     printf ("  rtx operand%d;\n", i);
 426   if (operands > 0 || max_dup_opno >= 0)
 427     printf ("  rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
 428   printf ("  rtx _val = 0;\n");
 429   printf ("  start_sequence ();\n");
 430
 431   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 432      before the actual construction.
 433      This code expects to refer to `operands'
 434      just as the output-code in a DEFINE_INSN does,
 435      but here `operands' is an automatic array.
 436      So copy the operand values there before executing it.  */
 437   if (XSTR (expand, 3) && *XSTR (expand, 3))
 438     {
 439       /* Output code to copy the arguments into `operands'.  */
 440       for (i = 0; i < operands; i++)
 441         printf ("  operands[%d] = operand%d;\n", i, i);
 442
 443       /* Output the special code to be executed before the sequence
 444          is generated.  */
 445       printf ("%s\n", XSTR (expand, 3));
 446
 447       /* Output code to copy the arguments back out of `operands'
 448          (unless we aren't going to use them at all).  */
 449       if (XVEC (expand, 1) != 0)
 450         {
 451           for (i = 0; i < operands; i++)
 452             printf ("  operand%d = operands[%d];\n", i, i);
 453           for (; i <= max_dup_opno; i++)
 454             printf ("  operand%d = operands[%d];\n", i, i);
 455         }
 456     }
 457
 458   /* Output code to construct the rtl for the instruction bodies.
 459      Use emit_insn to add them to the sequence being accumulated.
 460      But don't do this if the user's code has set `no_more' nonzero.  */
 461
 462   for (i = 0; i < XVECLEN (expand, 1); i++)
 463     {
 464       rtx next = XVECEXP (expand, 1, i);
 465       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 466           || (GET_CODE (next) == PARALLEL
 467               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 468               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 469           || GET_CODE (next) == RETURN)
 470         printf ("  emit_jump_insn (");
 471       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 472                || GET_CODE (next) == CALL
 473                || (GET_CODE (next) == PARALLEL
 474                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 475                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 476                || (GET_CODE (next) == PARALLEL
 477                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 478         printf ("  emit_call_insn (");
 479       else if (GET_CODE (next) == CODE_LABEL)
 480         printf ("  emit_label (");
 481       else if (GET_CODE (next) == MATCH_OPERAND
 482                || GET_CODE (next) == MATCH_OPERATOR
 483                || GET_CODE (next) == MATCH_PARALLEL
 484                || GET_CODE (next) == MATCH_OP_DUP
 485                || GET_CODE (next) == MATCH_DUP
 486                || GET_CODE (next) == PARALLEL)
 487         printf ("  emit (");
 488       else
 489         printf ("  emit_insn (");
 490       gen_exp (next);
 491       printf (");\n");
 492       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 493           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 494         printf ("  emit_barrier ();");
 495     }
 496
 497   /* Call `gen_sequence' to make a SEQUENCE out of all the
 498      insns emitted within this gen_... function.  */
 499
 500   printf (" _done:\n");
 501   printf ("  _val = gen_sequence ();\n");
 502   printf (" _fail:\n");
 503   printf ("  end_sequence ();\n");
 504   printf ("  return _val;\n}\n\n");
 505 }
 506
 507 /* Like gen_expand, but generates a SEQUENCE.  */
 508 static void
 509 gen_split (split)
 510      rtx split;
 511 {
 512   register int i;
 513   int operands;
 514
 515   if (XVEC (split, 0) == 0)
 516     fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
 517   else if (XVEC (split, 2) == 0)
 518     fatal ("define_split (definition %d) lacks a replacement pattern",
 519            insn_index_number);
 520
 521   /* Find out how many operands this function has.  */
 522
 523   max_operand_vec (split, 2);
 524   operands = MAX (max_opno, max_dup_opno) + 1;
 525
 526   /* Output the function name and argument declarations.  */
 527   printf ("rtx\ngen_split_%d (operands)\n     rtx *operands;\n",
 528           insn_code_number);
 529   printf ("{\n");
 530
 531   /* Declare all local variables.  */
 532   for (i = 0; i < operands; i++)
 533     printf ("  rtx operand%d;\n", i);
 534   printf ("  rtx _val = 0;\n");
 535   printf ("  start_sequence ();\n");
 536
 537   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 538      before the actual construction.  */
 539
 540   if (XSTR (split, 3))
 541     printf ("%s\n", XSTR (split, 3));
 542
 543   /* Output code to copy the arguments back out of `operands'  */
 544   for (i = 0; i < operands; i++)
 545     printf ("  operand%d = operands[%d];\n", i, i);
 546
 547   /* Output code to construct the rtl for the instruction bodies.
 548      Use emit_insn to add them to the sequence being accumulated.
 549      But don't do this if the user's code has set `no_more' nonzero.  */
 550
 551   for (i = 0; i < XVECLEN (split, 2); i++)
 552     {
 553       rtx next = XVECEXP (split, 2, i);
 554       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 555           || (GET_CODE (next) == PARALLEL
 556               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 557               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 558           || GET_CODE (next) == RETURN)
 559         printf ("  emit_jump_insn (");
 560       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 561                || GET_CODE (next) == CALL
 562                || (GET_CODE (next) == PARALLEL
 563                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 564                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 565                || (GET_CODE (next) == PARALLEL
 566                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 567         printf ("  emit_call_insn (");
 568       else if (GET_CODE (next) == CODE_LABEL)
 569         printf ("  emit_label (");
 570       else if (GET_CODE (next) == MATCH_OPERAND
 571                || GET_CODE (next) == MATCH_OPERATOR
 572                || GET_CODE (next) == MATCH_PARALLEL
 573                || GET_CODE (next) == MATCH_OP_DUP
 574                || GET_CODE (next) == MATCH_DUP
 575                || GET_CODE (next) == PARALLEL)
 576         printf ("  emit (");
 577       else
 578         printf ("  emit_insn (");
 579       gen_exp (next);
 580       printf (");\n");
 581       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 582           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 583         printf ("  emit_barrier ();");
 584     }
 585
 586   /* Call `gen_sequence' to make a SEQUENCE out of all the
 587      insns emitted within this gen_... function.  */
 588
 589   printf (" _done:\n");
 590   printf ("  _val = gen_sequence ();\n");
 591   printf (" _fail:\n");
 592   printf ("  end_sequence ();\n");
 593   printf ("  return _val;\n}\n\n");
 594 }
 595 \f
 596 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 597    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 598    the end of the vector.  */
 599
 600 static void
 601 output_add_clobbers ()
 602 {
 603   struct clobber_pat *clobber;
 604   struct clobber_ent *ent;
 605   int i;
 606
 607   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 608   printf ("     rtx pattern;\n     int insn_code_number;\n");
 609   printf ("{\n");
 610   printf ("  int i;\n\n");
 611   printf ("  switch (insn_code_number)\n");
 612   printf ("    {\n");
 613
 614   for (clobber = clobber_list; clobber; clobber = clobber->next)
 615     {
 616       for (ent = clobber->insns; ent; ent = ent->next)
 617         printf ("    case %d:\n", ent->code_number);
 618
 619       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 620         {
 621           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 622           gen_exp (XVECEXP (clobber->pattern, 1, i));
 623           printf (";\n");
 624         }
 625
 626       printf ("      break;\n\n");
 627     }
 628
 629   printf ("    default:\n");
 630   printf ("      abort ();\n");
 631   printf ("    }\n");
 632   printf ("}\n");
 633 }
 634 \f
 635 /* Write a function, init_mov_optab, that is called to set up entries
 636    in mov_optab for EXTRA_CC_MODES.  */
 637
 638 static void
 639 output_init_mov_optab ()
 640 {
 641 #ifdef EXTRA_CC_NAMES
 642   static char *cc_names[] = { EXTRA_CC_NAMES };
 643   char *p;
 644   int i;
 645
 646   printf ("\nvoid\ninit_mov_optab ()\n{\n");
 647
 648   for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
 649     {
 650       printf ("#ifdef HAVE_mov");
 651       for (p = cc_names[i]; *p; p++)
 652         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 653       printf ("\n");
 654       printf ("  if (HAVE_mov");
 655       for (p = cc_names[i]; *p; p++)
 656         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 657       printf (")\n");
 658       printf ("    mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
 659               cc_names[i]);
 660       for (p = cc_names[i]; *p; p++)
 661         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 662       printf (";\n#endif\n");
 663     }
 664
 665   printf ("}\n");
 666 #endif
 667 }
 668 \f
 669 char *
 670 xmalloc (size)
 671      unsigned size;
 672 {
 673   register char *val = (char *) malloc (size);
 674
 675   if (val == 0)
 676     fatal ("virtual memory exhausted");
 677
 678   return val;
 679 }
 680
 681 char *
 682 xrealloc (ptr, size)
 683      char *ptr;
 684      unsigned size;
 685 {
 686   char *result = (char *) realloc (ptr, size);
 687   if (!result)
 688     fatal ("virtual memory exhausted");
 689   return result;
 690 }
 691
 692 static void
 693 fatal (s, a1, a2)
 694      char *s;
 695 {
 696   fprintf (stderr, "genemit: ");
 697   fprintf (stderr, s, a1, a2);
 698   fprintf (stderr, "\n");
 699   exit (FATAL_EXIT_CODE);
 700 }
 701
 702 /* More 'friendly' abort that prints the line and file.
 703    config.h can #define abort fancy_abort if you like that sort of thing.  */
 704
 705 void
 706 fancy_abort ()
 707 {
 708   fatal ("Internal gcc abort.");
 709 }
 710 \f
 711 int
 712 main (argc, argv)
 713      int argc;
 714      char **argv;
 715 {
 716   rtx desc;
 717   FILE *infile;
 718   register int c;
 719
 720   obstack_init (rtl_obstack);
 721
 722   if (argc <= 1)
 723     fatal ("No input file name.");
 724
 725   infile = fopen (argv[1], "r");
 726   if (infile == 0)
 727     {
 728       perror (argv[1]);
 729       exit (FATAL_EXIT_CODE);
 730     }
 731
 732   init_rtl ();
 733
 734   /* Assign sequential codes to all entries in the machine description
 735      in parallel with the tables in insn-output.c.  */
 736
 737   insn_code_number = 0;
 738   insn_index_number = 0;
 739
 740   printf ("/* Generated automatically by the program `genemit'\n\
 741 from the machine description file `md'.  */\n\n");
 742
 743   printf ("#include \"config.h\"\n");
 744   printf ("#include \"rtl.h\"\n");
 745   printf ("#include \"expr.h\"\n");
 746   printf ("#include \"real.h\"\n");
 747   printf ("#include \"output.h\"\n");
 748   printf ("#include \"insn-config.h\"\n\n");
 749   printf ("#include \"insn-flags.h\"\n\n");
 750   printf ("#include \"insn-codes.h\"\n\n");
 751   printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
 752   printf ("extern rtx recog_operand[];\n");
 753   printf ("#define operands emit_operand\n\n");
 754   printf ("#define FAIL goto _fail\n\n");
 755   printf ("#define DONE goto _done\n\n");
 756
 757   /* Read the machine description.  */
 758
 759   while (1)
 760     {
 761       c = read_skip_spaces (infile);
 762       if (c == EOF)
 763         break;
 764       ungetc (c, infile);
 765
 766       desc = read_rtx (infile);
 767       if (GET_CODE (desc) == DEFINE_INSN)
 768         {
 769           gen_insn (desc);
 770           ++insn_code_number;
 771         }
 772       if (GET_CODE (desc) == DEFINE_EXPAND)
 773         {
 774           gen_expand (desc);
 775           ++insn_code_number;
 776         }
 777       if (GET_CODE (desc) == DEFINE_SPLIT)
 778         {
 779           gen_split (desc);
 780           ++insn_code_number;
 781         }
 782       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
 783         {
 784           ++insn_code_number;
 785         }
 786       ++insn_index_number;
 787     }
 788
 789   /* Write out the routine to add CLOBBERs to a pattern.  */
 790   output_add_clobbers ();
 791
 792   /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES.  */
 793   output_init_mov_optab ();
 794
 795   fflush (stdout);
 796   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 797   /* NOTREACHED */
 798   return 0;
 799 }