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, 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, 0)", 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
 230   printf ("gen_rtx (");
 231   print_code (code);
 232   printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 233
 234   fmt = GET_RTX_FORMAT (code);
 235   len = GET_RTX_LENGTH (code);
 236   for (i = 0; i < len; i++)
 237     {
 238       if (fmt[i] == '0')
 239         break;
 240       printf (",\n\t");
 241       if (fmt[i] == 'e' || fmt[i] == 'u')
 242         gen_exp (XEXP (x, i));
 243       else if (fmt[i] == 'i')
 244         printf ("%u", XINT (x, i));
 245       else if (fmt[i] == 's')
 246         printf ("\"%s\"", XSTR (x, i));
 247       else if (fmt[i] == 'E')
 248         {
 249           int j;
 250           printf ("gen_rtvec (%d", XVECLEN (x, i));
 251           for (j = 0; j < XVECLEN (x, i); j++)
 252             {
 253               printf (",\n\t\t");
 254               gen_exp (XVECEXP (x, i, j));
 255             }
 256           printf (")");
 257         }
 258       else
 259         abort ();
 260     }
 261   printf (")");
 262 }
 263 \f
 264 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 265
 266 static void
 267 gen_insn (insn)
 268      rtx insn;
 269 {
 270   int operands;
 271   register int i;
 272
 273   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 274      registers or MATCH_SCRATCHes.  If so, store away the information for
 275      later.  */
 276
 277   if (XVEC (insn, 1))
 278     {
 279       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 280         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 281             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 282                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 283           break;
 284
 285       if (i != XVECLEN (insn, 1) - 1)
 286         {
 287           register struct clobber_pat *p;
 288           register struct clobber_ent *link
 289             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 290           register int j;
 291
 292           link->code_number = insn_code_number;
 293
 294           /* See if any previous CLOBBER_LIST entry is the same as this
 295              one.  */
 296
 297           for (p = clobber_list; p; p = p->next)
 298             {
 299               if (p->first_clobber != i + 1
 300                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 301                 continue;
 302
 303               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 304                 {
 305                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 306                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 307
 308                   /* OLD and NEW are the same if both are to be a SCRATCH
 309                      of the same mode,
 310                      or if both are registers of the same mode and number.  */
 311                   if (! (GET_MODE (old) == GET_MODE (new)
 312                          && ((GET_CODE (old) == MATCH_SCRATCH
 313                               && GET_CODE (new) == MATCH_SCRATCH)
 314                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 315                                  && REGNO (old) == REGNO (new)))))
 316                     break;
 317                 }
 318
 319               if (j == XVECLEN (insn, 1))
 320                 break;
 321             }
 322
 323           if (p == 0)
 324             {
 325               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 326
 327               p->insns = 0;
 328               p->pattern = insn;
 329               p->first_clobber = i + 1;
 330               p->next = clobber_list;
 331               clobber_list = p;
 332             }
 333
 334           link->next = p->insns;
 335           p->insns = link;
 336         }
 337     }
 338
 339   /* Don't mention instructions whose names are the null string
 340      or begin with '*'.  They are in the machine description just
 341      to be recognized.  */
 342   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 343     return;
 344
 345   /* Find out how many operands this function has,
 346      and also whether any of them have register constraints.  */
 347   register_constraints = 0;
 348   operands = max_operand_vec (insn, 1);
 349   if (max_dup_opno >= operands)
 350     fatal ("match_dup operand number has no match_operand");
 351
 352   /* Output the function name and argument declarations.  */
 353   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 354   for (i = 0; i < operands; i++)
 355     printf (i ? ", operand%d" : "operand%d", i);
 356   printf (")\n");
 357   for (i = 0; i < operands; i++)
 358     printf ("     rtx operand%d;\n", i);
 359   printf ("{\n");
 360
 361   /* Output code to construct and return the rtl for the instruction body */
 362
 363   if (XVECLEN (insn, 1) == 1)
 364     {
 365       printf ("  return ");
 366       gen_exp (XVECEXP (insn, 1, 0));
 367       printf (";\n}\n\n");
 368     }
 369   else
 370     {
 371       printf ("  return gen_rtx (PARALLEL, VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
 372       for (i = 0; i < XVECLEN (insn, 1); i++)
 373         {
 374           printf (",\n\t\t");
 375           gen_exp (XVECEXP (insn, 1, i));
 376         }
 377       printf ("));\n}\n\n");
 378     }
 379 }
 380 \f
 381 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 382
 383 static void
 384 gen_expand (expand)
 385      rtx expand;
 386 {
 387   int operands;
 388   register int i;
 389
 390   if (strlen (XSTR (expand, 0)) == 0)
 391     fatal ("define_expand lacks a name");
 392   if (XVEC (expand, 1) == 0)
 393     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 394
 395   /* Find out how many operands this function has,
 396      and also whether any of them have register constraints.  */
 397   register_constraints = 0;
 398
 399   operands = max_operand_vec (expand, 1);
 400
 401   /* Output the function name and argument declarations.  */
 402   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 403   for (i = 0; i < operands; i++)
 404     printf (i ? ", operand%d" : "operand%d", i);
 405   printf (")\n");
 406   for (i = 0; i < operands; i++)
 407     printf ("     rtx operand%d;\n", i);
 408   printf ("{\n");
 409
 410   /* If we don't have any C code to write, only one insn is being written,
 411      and no MATCH_DUPs are present, we can just return the desired insn
 412      like we do for a DEFINE_INSN.  This saves memory.  */
 413   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 414       && operands > max_dup_opno
 415       && XVECLEN (expand, 1) == 1)
 416     {
 417       printf ("  return ");
 418       gen_exp (XVECEXP (expand, 1, 0));
 419       printf (";\n}\n\n");
 420       return;
 421     }
 422
 423   /* For each operand referred to only with MATCH_DUPs,
 424      make a local variable.  */
 425   for (i = operands; i <= max_dup_opno; i++)
 426     printf ("  rtx operand%d;\n", i);
 427   if (operands > 0 || max_dup_opno >= 0)
 428     printf ("  rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
 429   printf ("  rtx _val = 0;\n");
 430   printf ("  start_sequence ();\n");
 431
 432   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 433      before the actual construction.
 434      This code expects to refer to `operands'
 435      just as the output-code in a DEFINE_INSN does,
 436      but here `operands' is an automatic array.
 437      So copy the operand values there before executing it.  */
 438   if (XSTR (expand, 3) && *XSTR (expand, 3))
 439     {
 440       /* Output code to copy the arguments into `operands'.  */
 441       for (i = 0; i < operands; i++)
 442         printf ("  operands[%d] = operand%d;\n", i, i);
 443
 444       /* Output the special code to be executed before the sequence
 445          is generated.  */
 446       printf ("%s\n", XSTR (expand, 3));
 447
 448       /* Output code to copy the arguments back out of `operands'
 449          (unless we aren't going to use them at all).  */
 450       if (XVEC (expand, 1) != 0)
 451         {
 452           for (i = 0; i < operands; i++)
 453             printf ("  operand%d = operands[%d];\n", i, i);
 454           for (; i <= max_dup_opno; i++)
 455             printf ("  operand%d = operands[%d];\n", i, i);
 456         }
 457     }
 458
 459   /* Output code to construct the rtl for the instruction bodies.
 460      Use emit_insn to add them to the sequence being accumulated.
 461      But don't do this if the user's code has set `no_more' nonzero.  */
 462
 463   for (i = 0; i < XVECLEN (expand, 1); i++)
 464     {
 465       rtx next = XVECEXP (expand, 1, i);
 466       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 467           || (GET_CODE (next) == PARALLEL
 468               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 469               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 470           || GET_CODE (next) == RETURN)
 471         printf ("  emit_jump_insn (");
 472       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 473                || GET_CODE (next) == CALL
 474                || (GET_CODE (next) == PARALLEL
 475                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 476                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 477                || (GET_CODE (next) == PARALLEL
 478                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 479         printf ("  emit_call_insn (");
 480       else if (GET_CODE (next) == CODE_LABEL)
 481         printf ("  emit_label (");
 482       else if (GET_CODE (next) == MATCH_OPERAND
 483                || GET_CODE (next) == MATCH_OPERATOR
 484                || GET_CODE (next) == MATCH_PARALLEL
 485                || GET_CODE (next) == MATCH_OP_DUP
 486                || GET_CODE (next) == MATCH_DUP
 487                || GET_CODE (next) == PARALLEL)
 488         printf ("  emit (");
 489       else
 490         printf ("  emit_insn (");
 491       gen_exp (next);
 492       printf (");\n");
 493       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 494           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 495         printf ("  emit_barrier ();");
 496     }
 497
 498   /* Call `gen_sequence' to make a SEQUENCE out of all the
 499      insns emitted within this gen_... function.  */
 500
 501   printf (" _done:\n");
 502   printf ("  _val = gen_sequence ();\n");
 503   printf (" _fail:\n");
 504   printf ("  end_sequence ();\n");
 505   printf ("  return _val;\n}\n\n");
 506 }
 507
 508 /* Like gen_expand, but generates a SEQUENCE.  */
 509
 510 static void
 511 gen_split (split)
 512      rtx split;
 513 {
 514   register int i;
 515   int operands;
 516
 517   if (XVEC (split, 0) == 0)
 518     fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
 519   else if (XVEC (split, 2) == 0)
 520     fatal ("define_split (definition %d) lacks a replacement pattern",
 521            insn_index_number);
 522
 523   /* Find out how many operands this function has.  */
 524
 525   max_operand_vec (split, 2);
 526   operands = MAX (max_opno, max_dup_opno) + 1;
 527
 528   /* Output the function name and argument declarations.  */
 529   printf ("rtx\ngen_split_%d (operands)\n     rtx *operands;\n",
 530           insn_code_number);
 531   printf ("{\n");
 532
 533   /* Declare all local variables.  */
 534   for (i = 0; i < operands; i++)
 535     printf ("  rtx operand%d;\n", i);
 536   printf ("  rtx _val = 0;\n");
 537   printf ("  start_sequence ();\n");
 538
 539   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 540      before the actual construction.  */
 541
 542   if (XSTR (split, 3))
 543     printf ("%s\n", XSTR (split, 3));
 544
 545   /* Output code to copy the arguments back out of `operands'  */
 546   for (i = 0; i < operands; i++)
 547     printf ("  operand%d = operands[%d];\n", i, i);
 548
 549   /* Output code to construct the rtl for the instruction bodies.
 550      Use emit_insn to add them to the sequence being accumulated.
 551      But don't do this if the user's code has set `no_more' nonzero.  */
 552
 553   for (i = 0; i < XVECLEN (split, 2); i++)
 554     {
 555       rtx next = XVECEXP (split, 2, i);
 556       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 557           || (GET_CODE (next) == PARALLEL
 558               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 559               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 560           || GET_CODE (next) == RETURN)
 561         printf ("  emit_jump_insn (");
 562       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 563                || GET_CODE (next) == CALL
 564                || (GET_CODE (next) == PARALLEL
 565                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 566                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 567                || (GET_CODE (next) == PARALLEL
 568                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 569         printf ("  emit_call_insn (");
 570       else if (GET_CODE (next) == CODE_LABEL)
 571         printf ("  emit_label (");
 572       else if (GET_CODE (next) == MATCH_OPERAND
 573                || GET_CODE (next) == MATCH_OPERATOR
 574                || GET_CODE (next) == MATCH_PARALLEL
 575                || GET_CODE (next) == MATCH_OP_DUP
 576                || GET_CODE (next) == MATCH_DUP
 577                || GET_CODE (next) == PARALLEL)
 578         printf ("  emit (");
 579       else
 580         printf ("  emit_insn (");
 581       gen_exp (next);
 582       printf (");\n");
 583       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 584           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 585         printf ("  emit_barrier ();");
 586     }
 587
 588   /* Call `gen_sequence' to make a SEQUENCE out of all the
 589      insns emitted within this gen_... function.  */
 590
 591   printf (" _done:\n");
 592   printf ("  _val = gen_sequence ();\n");
 593   printf (" _fail:\n");
 594   printf ("  end_sequence ();\n");
 595   printf ("  return _val;\n}\n\n");
 596 }
 597 \f
 598 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 599    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 600    the end of the vector.  */
 601
 602 static void
 603 output_add_clobbers ()
 604 {
 605   struct clobber_pat *clobber;
 606   struct clobber_ent *ent;
 607   int i;
 608
 609   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 610   printf ("     rtx pattern;\n     int insn_code_number;\n");
 611   printf ("{\n");
 612   printf ("  int i;\n\n");
 613   printf ("  switch (insn_code_number)\n");
 614   printf ("    {\n");
 615
 616   for (clobber = clobber_list; clobber; clobber = clobber->next)
 617     {
 618       for (ent = clobber->insns; ent; ent = ent->next)
 619         printf ("    case %d:\n", ent->code_number);
 620
 621       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 622         {
 623           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 624           gen_exp (XVECEXP (clobber->pattern, 1, i));
 625           printf (";\n");
 626         }
 627
 628       printf ("      break;\n\n");
 629     }
 630
 631   printf ("    default:\n");
 632   printf ("      abort ();\n");
 633   printf ("    }\n");
 634   printf ("}\n");
 635 }
 636 \f
 637 /* Write a function, init_mov_optab, that is called to set up entries
 638    in mov_optab for EXTRA_CC_MODES.  */
 639
 640 static void
 641 output_init_mov_optab ()
 642 {
 643 #ifdef EXTRA_CC_NAMES
 644   static char *cc_names[] = { EXTRA_CC_NAMES };
 645   char *p;
 646   int i;
 647
 648   printf ("\nvoid\ninit_mov_optab ()\n{\n");
 649
 650   for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
 651     {
 652       printf ("#ifdef HAVE_mov");
 653       for (p = cc_names[i]; *p; p++)
 654         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 655       printf ("\n");
 656       printf ("  if (HAVE_mov");
 657       for (p = cc_names[i]; *p; p++)
 658         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 659       printf (")\n");
 660       printf ("    mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
 661               cc_names[i]);
 662       for (p = cc_names[i]; *p; p++)
 663         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 664       printf (";\n#endif\n");
 665     }
 666
 667   printf ("}\n");
 668 #endif
 669 }
 670 \f
 671 char *
 672 xmalloc (size)
 673      unsigned size;
 674 {
 675   register char *val = (char *) malloc (size);
 676
 677   if (val == 0)
 678     fatal ("virtual memory exhausted");
 679
 680   return val;
 681 }
 682
 683 char *
 684 xrealloc (ptr, size)
 685      char *ptr;
 686      unsigned size;
 687 {
 688   char *result = (char *) realloc (ptr, size);
 689   if (!result)
 690     fatal ("virtual memory exhausted");
 691   return result;
 692 }
 693
 694 static void
 695 fatal (s, a1, a2)
 696      char *s;
 697 {
 698   fprintf (stderr, "genemit: ");
 699   fprintf (stderr, s, a1, a2);
 700   fprintf (stderr, "\n");
 701   exit (FATAL_EXIT_CODE);
 702 }
 703
 704 /* More 'friendly' abort that prints the line and file.
 705    config.h can #define abort fancy_abort if you like that sort of thing.  */
 706
 707 void
 708 fancy_abort ()
 709 {
 710   fatal ("Internal gcc abort.");
 711 }
 712 \f
 713 int
 714 main (argc, argv)
 715      int argc;
 716      char **argv;
 717 {
 718   rtx desc;
 719   FILE *infile;
 720   register int c;
 721
 722   obstack_init (rtl_obstack);
 723
 724   if (argc <= 1)
 725     fatal ("No input file name.");
 726
 727   infile = fopen (argv[1], "r");
 728   if (infile == 0)
 729     {
 730       perror (argv[1]);
 731       exit (FATAL_EXIT_CODE);
 732     }
 733
 734   init_rtl ();
 735
 736   /* Assign sequential codes to all entries in the machine description
 737      in parallel with the tables in insn-output.c.  */
 738
 739   insn_code_number = 0;
 740   insn_index_number = 0;
 741
 742   printf ("/* Generated automatically by the program `genemit'\n\
 743 from the machine description file `md'.  */\n\n");
 744
 745   printf ("#include \"config.h\"\n");
 746   printf ("#include \"rtl.h\"\n");
 747   printf ("#include \"expr.h\"\n");
 748   printf ("#include \"real.h\"\n");
 749   printf ("#include \"output.h\"\n");
 750   printf ("#include \"insn-config.h\"\n\n");
 751   printf ("#include \"insn-flags.h\"\n\n");
 752   printf ("#include \"insn-codes.h\"\n\n");
 753   printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
 754   printf ("extern rtx recog_operand[];\n");
 755   printf ("#define operands emit_operand\n\n");
 756   printf ("#define FAIL goto _fail\n\n");
 757   printf ("#define DONE goto _done\n\n");
 758
 759   /* Read the machine description.  */
 760
 761   while (1)
 762     {
 763       c = read_skip_spaces (infile);
 764       if (c == EOF)
 765         break;
 766       ungetc (c, infile);
 767
 768       desc = read_rtx (infile);
 769       if (GET_CODE (desc) == DEFINE_INSN)
 770         {
 771           gen_insn (desc);
 772           ++insn_code_number;
 773         }
 774       if (GET_CODE (desc) == DEFINE_EXPAND)
 775         {
 776           gen_expand (desc);
 777           ++insn_code_number;
 778         }
 779       if (GET_CODE (desc) == DEFINE_SPLIT)
 780         {
 781           gen_split (desc);
 782           ++insn_code_number;
 783         }
 784       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
 785         {
 786           ++insn_code_number;
 787         }
 788       ++insn_index_number;
 789     }
 790
 791   /* Write out the routine to add CLOBBERs to a pattern.  */
 792   output_add_clobbers ();
 793
 794   /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES.  */
 795   output_init_mov_optab ();
 796
 797   fflush (stdout);
 798   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 799   /* NOTREACHED */
 800   return 0;
 801 }