gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 88, 91, 94, 95, 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 static int max_opno;
  38 static int max_dup_opno;
  39 static int register_constraints;
  40 static int insn_code_number;
  41 static int insn_index_number;
  42
  43 /* Data structure for recording the patterns of insns that have CLOBBERs.
  44    We use this to output a function that adds these CLOBBERs to a
  45    previously-allocated PARALLEL expression.  */
  46
  47 struct clobber_pat
  48 {
  49   struct clobber_ent *insns;
  50   rtx pattern;
  51   int first_clobber;
  52   struct clobber_pat *next;
  53 } *clobber_list;
  54
  55 /* Records one insn that uses the clobber list.  */
  56
  57 struct clobber_ent
  58 {
  59   int code_number;              /* Counts only insns.  */
  60   struct clobber_ent *next;
  61 };
  62
  63 static void
  64 max_operand_1 (x)
  65      rtx x;
  66 {
  67   register RTX_CODE code;
  68   register int i;
  69   register int len;
  70   register char *fmt;
  71
  72   if (x == 0)
  73     return;
  74
  75   code = GET_CODE (x);
  76
  77   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  78     register_constraints = 1;
  79   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  80     register_constraints = 1;
  81   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  82       || code == MATCH_PARALLEL)
  83     max_opno = MAX (max_opno, XINT (x, 0));
  84   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  85     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  86
  87   fmt = GET_RTX_FORMAT (code);
  88   len = GET_RTX_LENGTH (code);
  89   for (i = 0; i < len; i++)
  90     {
  91       if (fmt[i] == 'e' || fmt[i] == 'u')
  92         max_operand_1 (XEXP (x, i));
  93       else if (fmt[i] == 'E')
  94         {
  95           int j;
  96           for (j = 0; j < XVECLEN (x, i); j++)
  97             max_operand_1 (XVECEXP (x, i, j));
  98         }
  99     }
 100 }
 101
 102 static int
 103 max_operand_vec (insn, arg)
 104      rtx insn;
 105      int arg;
 106 {
 107   register int len = XVECLEN (insn, arg);
 108   register int i;
 109
 110   max_opno = -1;
 111   max_dup_opno = -1;
 112
 113   for (i = 0; i < len; i++)
 114     max_operand_1 (XVECEXP (insn, arg, i));
 115
 116   return max_opno + 1;
 117 }
 118 \f
 119 static void
 120 print_code (code)
 121      RTX_CODE code;
 122 {
 123   register char *p1;
 124   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 125     {
 126       if (*p1 >= 'a' && *p1 <= 'z')
 127         putchar (*p1 + 'A' - 'a');
 128       else
 129         putchar (*p1);
 130     }
 131 }
 132
 133 /* Print a C expression to construct an RTX just like X,
 134    substituting any operand references appearing within.  */
 135
 136 static void
 137 gen_exp (x)
 138      rtx x;
 139 {
 140   register RTX_CODE code;
 141   register int i;
 142   register int len;
 143   register char *fmt;
 144
 145   if (x == 0)
 146     {
 147       printf ("NULL_RTX");
 148       return;
 149     }
 150
 151   code = GET_CODE (x);
 152
 153   switch (code)
 154     {
 155     case MATCH_OPERAND:
 156     case MATCH_DUP:
 157       printf ("operand%d", XINT (x, 0));
 158       return;
 159
 160     case MATCH_OP_DUP:
 161       printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
 162               XINT (x, 0), XINT (x, 0));
 163       for (i = 0; i < XVECLEN (x, 1); i++)
 164         {
 165           printf (",\n\t\t");
 166           gen_exp (XVECEXP (x, 1, i));
 167         }
 168       printf (")");
 169       return;
 170
 171     case MATCH_OPERATOR:
 172       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 173       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 174       for (i = 0; i < XVECLEN (x, 2); i++)
 175         {
 176           printf (",\n\t\t");
 177           gen_exp (XVECEXP (x, 2, i));
 178         }
 179       printf (")");
 180       return;
 181
 182     case MATCH_PARALLEL:
 183     case MATCH_PAR_DUP:
 184       printf ("operand%d", XINT (x, 0));
 185       return;
 186
 187     case MATCH_SCRATCH:
 188       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 189       return;
 190
 191     case ADDRESS:
 192       fatal ("ADDRESS expression code used in named instruction pattern");
 193
 194     case PC:
 195       printf ("pc_rtx");
 196       return;
 197
 198     case CC0:
 199       printf ("cc0_rtx");
 200       return;
 201
 202     case CONST_INT:
 203       if (INTVAL (x) == 0)
 204         printf ("const0_rtx");
 205       else if (INTVAL (x) == 1)
 206         printf ("const1_rtx");
 207       else if (INTVAL (x) == -1)
 208         printf ("constm1_rtx");
 209       else if (INTVAL (x) == STORE_FLAG_VALUE)
 210         printf ("const_true_rtx");
 211       else
 212         {
 213           printf ("GEN_INT (");
 214           printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
 215           printf (")");
 216         }
 217       return;
 218
 219     case CONST_DOUBLE:
 220       /* These shouldn't be written in MD files.  Instead, the appropriate
 221          routines in varasm.c should be called.  */
 222       abort ();
 223
 224     default:
 225       break;
 226     }
 227
 228   printf ("gen_rtx_");
 229   print_code (code);
 230   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 231
 232   fmt = GET_RTX_FORMAT (code);
 233   len = GET_RTX_LENGTH (code);
 234   for (i = 0; i < len; i++)
 235     {
 236       if (fmt[i] == '0')
 237         break;
 238       printf (",\n\t");
 239       if (fmt[i] == 'e' || fmt[i] == 'u')
 240         gen_exp (XEXP (x, i));
 241       else if (fmt[i] == 'i')
 242         printf ("%u", XINT (x, i));
 243       else if (fmt[i] == 's')
 244         printf ("\"%s\"", XSTR (x, i));
 245       else if (fmt[i] == 'E')
 246         {
 247           int j;
 248           printf ("gen_rtvec (%d", XVECLEN (x, i));
 249           for (j = 0; j < XVECLEN (x, i); j++)
 250             {
 251               printf (",\n\t\t");
 252               gen_exp (XVECEXP (x, i, j));
 253             }
 254           printf (")");
 255         }
 256       else
 257         abort ();
 258     }
 259   printf (")");
 260 }
 261 \f
 262 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 263
 264 static void
 265 gen_insn (insn)
 266      rtx insn;
 267 {
 268   int operands;
 269   register int i;
 270
 271   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 272      registers or MATCH_SCRATCHes.  If so, store away the information for
 273      later.  */
 274
 275   if (XVEC (insn, 1))
 276     {
 277       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 278         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 279             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 280                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 281           break;
 282
 283       if (i != XVECLEN (insn, 1) - 1)
 284         {
 285           register struct clobber_pat *p;
 286           register struct clobber_ent *link
 287             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 288           register int j;
 289
 290           link->code_number = insn_code_number;
 291
 292           /* See if any previous CLOBBER_LIST entry is the same as this
 293              one.  */
 294
 295           for (p = clobber_list; p; p = p->next)
 296             {
 297               if (p->first_clobber != i + 1
 298                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 299                 continue;
 300
 301               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 302                 {
 303                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 304                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 305
 306                   /* OLD and NEW are the same if both are to be a SCRATCH
 307                      of the same mode,
 308                      or if both are registers of the same mode and number.  */
 309                   if (! (GET_MODE (old) == GET_MODE (new)
 310                          && ((GET_CODE (old) == MATCH_SCRATCH
 311                               && GET_CODE (new) == MATCH_SCRATCH)
 312                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 313                                  && REGNO (old) == REGNO (new)))))
 314                     break;
 315                 }
 316
 317               if (j == XVECLEN (insn, 1))
 318                 break;
 319             }
 320
 321           if (p == 0)
 322             {
 323               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 324
 325               p->insns = 0;
 326               p->pattern = insn;
 327               p->first_clobber = i + 1;
 328               p->next = clobber_list;
 329               clobber_list = p;
 330             }
 331
 332           link->next = p->insns;
 333           p->insns = link;
 334         }
 335     }
 336
 337   /* Don't mention instructions whose names are the null string
 338      or begin with '*'.  They are in the machine description just
 339      to be recognized.  */
 340   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 341     return;
 342
 343   /* Find out how many operands this function has,
 344      and also whether any of them have register constraints.  */
 345   register_constraints = 0;
 346   operands = max_operand_vec (insn, 1);
 347   if (max_dup_opno >= operands)
 348     fatal ("match_dup operand number has no match_operand");
 349
 350   /* Output the function name and argument declarations.  */
 351   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 352   for (i = 0; i < operands; i++)
 353     printf (i ? ", operand%d" : "operand%d", i);
 354   printf (")\n");
 355   for (i = 0; i < operands; i++)
 356     printf ("     rtx operand%d;\n", i);
 357   printf ("{\n");
 358
 359   /* Output code to construct and return the rtl for the instruction body */
 360
 361   if (XVECLEN (insn, 1) == 1)
 362     {
 363       printf ("  return ");
 364       gen_exp (XVECEXP (insn, 1, 0));
 365       printf (";\n}\n\n");
 366     }
 367   else
 368     {
 369       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
 370       for (i = 0; i < XVECLEN (insn, 1); i++)
 371         {
 372           printf (",\n\t\t");
 373           gen_exp (XVECEXP (insn, 1, i));
 374         }
 375       printf ("));\n}\n\n");
 376     }
 377 }
 378 \f
 379 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 380
 381 static void
 382 gen_expand (expand)
 383      rtx expand;
 384 {
 385   int operands;
 386   register int i;
 387
 388   if (strlen (XSTR (expand, 0)) == 0)
 389     fatal ("define_expand lacks a name");
 390   if (XVEC (expand, 1) == 0)
 391     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 392
 393   /* Find out how many operands this function has,
 394      and also whether any of them have register constraints.  */
 395   register_constraints = 0;
 396
 397   operands = max_operand_vec (expand, 1);
 398
 399   /* Output the function name and argument declarations.  */
 400   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 401   for (i = 0; i < operands; i++)
 402     printf (i ? ", operand%d" : "operand%d", i);
 403   printf (")\n");
 404   for (i = 0; i < operands; i++)
 405     printf ("     rtx operand%d;\n", i);
 406   printf ("{\n");
 407
 408   /* If we don't have any C code to write, only one insn is being written,
 409      and no MATCH_DUPs are present, we can just return the desired insn
 410      like we do for a DEFINE_INSN.  This saves memory.  */
 411   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 412       && operands > max_dup_opno
 413       && XVECLEN (expand, 1) == 1)
 414     {
 415       printf ("  return ");
 416       gen_exp (XVECEXP (expand, 1, 0));
 417       printf (";\n}\n\n");
 418       return;
 419     }
 420
 421   /* For each operand referred to only with MATCH_DUPs,
 422      make a local variable.  */
 423   for (i = operands; i <= max_dup_opno; i++)
 424     printf ("  rtx operand%d;\n", i);
 425   if (operands > 0 || max_dup_opno >= 0)
 426     printf ("  rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
 427   printf ("  rtx _val = 0;\n");
 428   printf ("  start_sequence ();\n");
 429
 430   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 431      before the actual construction.
 432      This code expects to refer to `operands'
 433      just as the output-code in a DEFINE_INSN does,
 434      but here `operands' is an automatic array.
 435      So copy the operand values there before executing it.  */
 436   if (XSTR (expand, 3) && *XSTR (expand, 3))
 437     {
 438       /* Output code to copy the arguments into `operands'.  */
 439       for (i = 0; i < operands; i++)
 440         printf ("  operands[%d] = operand%d;\n", i, i);
 441
 442       /* Output the special code to be executed before the sequence
 443          is generated.  */
 444       printf ("%s\n", XSTR (expand, 3));
 445
 446       /* Output code to copy the arguments back out of `operands'
 447          (unless we aren't going to use them at all).  */
 448       if (XVEC (expand, 1) != 0)
 449         {
 450           for (i = 0; i < operands; i++)
 451             printf ("  operand%d = operands[%d];\n", i, i);
 452           for (; i <= max_dup_opno; i++)
 453             printf ("  operand%d = operands[%d];\n", i, i);
 454         }
 455     }
 456
 457   /* Output code to construct the rtl for the instruction bodies.
 458      Use emit_insn to add them to the sequence being accumulated.
 459      But don't do this if the user's code has set `no_more' nonzero.  */
 460
 461   for (i = 0; i < XVECLEN (expand, 1); i++)
 462     {
 463       rtx next = XVECEXP (expand, 1, i);
 464       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 465           || (GET_CODE (next) == PARALLEL
 466               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 467               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 468           || GET_CODE (next) == RETURN)
 469         printf ("  emit_jump_insn (");
 470       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 471                || GET_CODE (next) == CALL
 472                || (GET_CODE (next) == PARALLEL
 473                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 474                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 475                || (GET_CODE (next) == PARALLEL
 476                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 477         printf ("  emit_call_insn (");
 478       else if (GET_CODE (next) == CODE_LABEL)
 479         printf ("  emit_label (");
 480       else if (GET_CODE (next) == MATCH_OPERAND
 481                || GET_CODE (next) == MATCH_OPERATOR
 482                || GET_CODE (next) == MATCH_PARALLEL
 483                || GET_CODE (next) == MATCH_OP_DUP
 484                || GET_CODE (next) == MATCH_DUP
 485                || GET_CODE (next) == PARALLEL)
 486         printf ("  emit (");
 487       else
 488         printf ("  emit_insn (");
 489       gen_exp (next);
 490       printf (");\n");
 491       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 492           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 493         printf ("  emit_barrier ();");
 494     }
 495
 496   /* Call `gen_sequence' to make a SEQUENCE out of all the
 497      insns emitted within this gen_... function.  */
 498
 499   printf (" _done:\n");
 500   printf ("  _val = gen_sequence ();\n");
 501   printf (" _fail:\n");
 502   printf ("  end_sequence ();\n");
 503   printf ("  return _val;\n}\n\n");
 504 }
 505
 506 /* Like gen_expand, but generates a SEQUENCE.  */
 507
 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   size_t 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 <stdio.h>\n");
 745   printf ("#include \"rtl.h\"\n");
 746   printf ("#include \"expr.h\"\n");
 747   printf ("#include \"real.h\"\n");
 748   printf ("#include \"flags.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 }