gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 88, 91, 94, 95, 97, 98, 1999 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 void fatal PVPROTO ((const char *, ...))
  34   ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
  35 void fancy_abort PROTO((void)) ATTRIBUTE_NORETURN;
  36
  37 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
  38 char **insn_name_ptr = 0;
  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 max_operand_1               PROTO((rtx));
  67 static int max_operand_vec              PROTO((rtx, int));
  68 static void print_code                  PROTO((RTX_CODE));
  69 static void gen_exp                     PROTO((rtx));
  70 static void gen_insn                    PROTO((rtx));
  71 static void gen_expand                  PROTO((rtx));
  72 static void gen_split                   PROTO((rtx));
  73 static void output_add_clobbers         PROTO((void));
  74 static void output_init_mov_optab       PROTO((void));
  75
  76 \f
  77 static void
  78 max_operand_1 (x)
  79      rtx x;
  80 {
  81   register RTX_CODE code;
  82   register int i;
  83   register int len;
  84   register char *fmt;
  85
  86   if (x == 0)
  87     return;
  88
  89   code = GET_CODE (x);
  90
  91   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  92     register_constraints = 1;
  93   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  94     register_constraints = 1;
  95   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  96       || code == MATCH_PARALLEL)
  97     max_opno = MAX (max_opno, XINT (x, 0));
  98   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  99     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
 100
 101   fmt = GET_RTX_FORMAT (code);
 102   len = GET_RTX_LENGTH (code);
 103   for (i = 0; i < len; i++)
 104     {
 105       if (fmt[i] == 'e' || fmt[i] == 'u')
 106         max_operand_1 (XEXP (x, i));
 107       else if (fmt[i] == 'E')
 108         {
 109           int j;
 110           for (j = 0; j < XVECLEN (x, i); j++)
 111             max_operand_1 (XVECEXP (x, i, j));
 112         }
 113     }
 114 }
 115
 116 static int
 117 max_operand_vec (insn, arg)
 118      rtx insn;
 119      int arg;
 120 {
 121   register int len = XVECLEN (insn, arg);
 122   register int i;
 123
 124   max_opno = -1;
 125   max_dup_opno = -1;
 126
 127   for (i = 0; i < len; i++)
 128     max_operand_1 (XVECEXP (insn, arg, i));
 129
 130   return max_opno + 1;
 131 }
 132 \f
 133 static void
 134 print_code (code)
 135      RTX_CODE code;
 136 {
 137   register char *p1;
 138   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 139     {
 140       if (*p1 >= 'a' && *p1 <= 'z')
 141         putchar (*p1 + 'A' - 'a');
 142       else
 143         putchar (*p1);
 144     }
 145 }
 146
 147 /* Print a C expression to construct an RTX just like X,
 148    substituting any operand references appearing within.  */
 149
 150 static void
 151 gen_exp (x)
 152      rtx x;
 153 {
 154   register RTX_CODE code;
 155   register int i;
 156   register int len;
 157   register char *fmt;
 158
 159   if (x == 0)
 160     {
 161       printf ("NULL_RTX");
 162       return;
 163     }
 164
 165   code = GET_CODE (x);
 166
 167   switch (code)
 168     {
 169     case MATCH_OPERAND:
 170     case MATCH_DUP:
 171       printf ("operand%d", XINT (x, 0));
 172       return;
 173
 174     case MATCH_OP_DUP:
 175       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 176       if (GET_MODE (x) == VOIDmode)
 177         printf ("GET_MODE (operand%d)", XINT (x, 0));
 178       else
 179         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 180       for (i = 0; i < XVECLEN (x, 1); i++)
 181         {
 182           printf (",\n\t\t");
 183           gen_exp (XVECEXP (x, 1, i));
 184         }
 185       printf (")");
 186       return;
 187
 188     case MATCH_OPERATOR:
 189       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 190       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 191       for (i = 0; i < XVECLEN (x, 2); i++)
 192         {
 193           printf (",\n\t\t");
 194           gen_exp (XVECEXP (x, 2, i));
 195         }
 196       printf (")");
 197       return;
 198
 199     case MATCH_PARALLEL:
 200     case MATCH_PAR_DUP:
 201       printf ("operand%d", XINT (x, 0));
 202       return;
 203
 204     case MATCH_SCRATCH:
 205       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 206       return;
 207
 208     case ADDRESS:
 209       fatal ("ADDRESS expression code used in named instruction pattern");
 210
 211     case PC:
 212       printf ("pc_rtx");
 213       return;
 214
 215     case CC0:
 216       printf ("cc0_rtx");
 217       return;
 218
 219     case CONST_INT:
 220       if (INTVAL (x) == 0)
 221         printf ("const0_rtx");
 222       else if (INTVAL (x) == 1)
 223         printf ("const1_rtx");
 224       else if (INTVAL (x) == -1)
 225         printf ("constm1_rtx");
 226       else if (INTVAL (x) == STORE_FLAG_VALUE)
 227         printf ("const_true_rtx");
 228       else
 229         {
 230           printf ("GEN_INT (");
 231           printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
 232           printf (")");
 233         }
 234       return;
 235
 236     case CONST_DOUBLE:
 237       /* These shouldn't be written in MD files.  Instead, the appropriate
 238          routines in varasm.c should be called.  */
 239       abort ();
 240
 241     default:
 242       break;
 243     }
 244
 245   printf ("gen_rtx_");
 246   print_code (code);
 247   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 248
 249   fmt = GET_RTX_FORMAT (code);
 250   len = GET_RTX_LENGTH (code);
 251   for (i = 0; i < len; i++)
 252     {
 253       if (fmt[i] == '0')
 254         break;
 255       printf (",\n\t");
 256       if (fmt[i] == 'e' || fmt[i] == 'u')
 257         gen_exp (XEXP (x, i));
 258       else if (fmt[i] == 'i')
 259         printf ("%u", XINT (x, i));
 260       else if (fmt[i] == 's')
 261         printf ("\"%s\"", XSTR (x, i));
 262       else if (fmt[i] == 'E')
 263         {
 264           int j;
 265           printf ("gen_rtvec (%d", XVECLEN (x, i));
 266           for (j = 0; j < XVECLEN (x, i); j++)
 267             {
 268               printf (",\n\t\t");
 269               gen_exp (XVECEXP (x, i, j));
 270             }
 271           printf (")");
 272         }
 273       else
 274         abort ();
 275     }
 276   printf (")");
 277 }
 278 \f
 279 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 280
 281 static void
 282 gen_insn (insn)
 283      rtx insn;
 284 {
 285   int operands;
 286   register int i;
 287
 288   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 289      registers or MATCH_SCRATCHes.  If so, store away the information for
 290      later.  */
 291
 292   if (XVEC (insn, 1))
 293     {
 294       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 295         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 296             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 297                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 298           break;
 299
 300       if (i != XVECLEN (insn, 1) - 1)
 301         {
 302           register struct clobber_pat *p;
 303           register struct clobber_ent *link
 304             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 305           register int j;
 306
 307           link->code_number = insn_code_number;
 308
 309           /* See if any previous CLOBBER_LIST entry is the same as this
 310              one.  */
 311
 312           for (p = clobber_list; p; p = p->next)
 313             {
 314               if (p->first_clobber != i + 1
 315                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 316                 continue;
 317
 318               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 319                 {
 320                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 321                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 322
 323                   /* OLD and NEW are the same if both are to be a SCRATCH
 324                      of the same mode,
 325                      or if both are registers of the same mode and number.  */
 326                   if (! (GET_MODE (old) == GET_MODE (new)
 327                          && ((GET_CODE (old) == MATCH_SCRATCH
 328                               && GET_CODE (new) == MATCH_SCRATCH)
 329                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 330                                  && REGNO (old) == REGNO (new)))))
 331                     break;
 332                 }
 333
 334               if (j == XVECLEN (insn, 1))
 335                 break;
 336             }
 337
 338           if (p == 0)
 339             {
 340               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 341
 342               p->insns = 0;
 343               p->pattern = insn;
 344               p->first_clobber = i + 1;
 345               p->next = clobber_list;
 346               clobber_list = p;
 347             }
 348
 349           link->next = p->insns;
 350           p->insns = link;
 351         }
 352     }
 353
 354   /* Don't mention instructions whose names are the null string
 355      or begin with '*'.  They are in the machine description just
 356      to be recognized.  */
 357   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 358     return;
 359
 360   /* Find out how many operands this function has,
 361      and also whether any of them have register constraints.  */
 362   register_constraints = 0;
 363   operands = max_operand_vec (insn, 1);
 364   if (max_dup_opno >= operands)
 365     fatal ("match_dup operand number has no match_operand");
 366
 367   /* Output the function name and argument declarations.  */
 368   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 369   for (i = 0; i < operands; i++)
 370     printf (i ? ", operand%d" : "operand%d", i);
 371   printf (")\n");
 372   for (i = 0; i < operands; i++)
 373     printf ("     rtx operand%d;\n", i);
 374   printf ("{\n");
 375
 376   /* Output code to construct and return the rtl for the instruction body */
 377
 378   if (XVECLEN (insn, 1) == 1)
 379     {
 380       printf ("  return ");
 381       gen_exp (XVECEXP (insn, 1, 0));
 382       printf (";\n}\n\n");
 383     }
 384   else
 385     {
 386       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
 387       for (i = 0; i < XVECLEN (insn, 1); i++)
 388         {
 389           printf (",\n\t\t");
 390           gen_exp (XVECEXP (insn, 1, i));
 391         }
 392       printf ("));\n}\n\n");
 393     }
 394 }
 395 \f
 396 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 397
 398 static void
 399 gen_expand (expand)
 400      rtx expand;
 401 {
 402   int operands;
 403   register int i;
 404
 405   if (strlen (XSTR (expand, 0)) == 0)
 406     fatal ("define_expand lacks a name");
 407   if (XVEC (expand, 1) == 0)
 408     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 409
 410   /* Find out how many operands this function has,
 411      and also whether any of them have register constraints.  */
 412   register_constraints = 0;
 413
 414   operands = max_operand_vec (expand, 1);
 415
 416   /* Output the function name and argument declarations.  */
 417   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 418   for (i = 0; i < operands; i++)
 419     printf (i ? ", operand%d" : "operand%d", i);
 420   printf (")\n");
 421   for (i = 0; i < operands; i++)
 422     printf ("     rtx operand%d;\n", i);
 423   printf ("{\n");
 424
 425   /* If we don't have any C code to write, only one insn is being written,
 426      and no MATCH_DUPs are present, we can just return the desired insn
 427      like we do for a DEFINE_INSN.  This saves memory.  */
 428   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 429       && operands > max_dup_opno
 430       && XVECLEN (expand, 1) == 1)
 431     {
 432       printf ("  return ");
 433       gen_exp (XVECEXP (expand, 1, 0));
 434       printf (";\n}\n\n");
 435       return;
 436     }
 437
 438   /* For each operand referred to only with MATCH_DUPs,
 439      make a local variable.  */
 440   for (i = operands; i <= max_dup_opno; i++)
 441     printf ("  rtx operand%d;\n", i);
 442   if (operands > 0 || max_dup_opno >= 0)
 443     printf ("  rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
 444   printf ("  rtx _val = 0;\n");
 445   printf ("  start_sequence ();\n");
 446
 447   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 448      before the actual construction.
 449      This code expects to refer to `operands'
 450      just as the output-code in a DEFINE_INSN does,
 451      but here `operands' is an automatic array.
 452      So copy the operand values there before executing it.  */
 453   if (XSTR (expand, 3) && *XSTR (expand, 3))
 454     {
 455       /* Output code to copy the arguments into `operands'.  */
 456       for (i = 0; i < operands; i++)
 457         printf ("  operands[%d] = operand%d;\n", i, i);
 458
 459       /* Output the special code to be executed before the sequence
 460          is generated.  */
 461       printf ("%s\n", XSTR (expand, 3));
 462
 463       /* Output code to copy the arguments back out of `operands'
 464          (unless we aren't going to use them at all).  */
 465       if (XVEC (expand, 1) != 0)
 466         {
 467           for (i = 0; i < operands; i++)
 468             printf ("  operand%d = operands[%d];\n", i, i);
 469           for (; i <= max_dup_opno; i++)
 470             printf ("  operand%d = operands[%d];\n", i, i);
 471         }
 472     }
 473
 474   /* Output code to construct the rtl for the instruction bodies.
 475      Use emit_insn to add them to the sequence being accumulated.
 476      But don't do this if the user's code has set `no_more' nonzero.  */
 477
 478   for (i = 0; i < XVECLEN (expand, 1); i++)
 479     {
 480       rtx next = XVECEXP (expand, 1, i);
 481       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 482           || (GET_CODE (next) == PARALLEL
 483               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 484               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 485           || GET_CODE (next) == RETURN)
 486         printf ("  emit_jump_insn (");
 487       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 488                || GET_CODE (next) == CALL
 489                || (GET_CODE (next) == PARALLEL
 490                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 491                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 492                || (GET_CODE (next) == PARALLEL
 493                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 494         printf ("  emit_call_insn (");
 495       else if (GET_CODE (next) == CODE_LABEL)
 496         printf ("  emit_label (");
 497       else if (GET_CODE (next) == MATCH_OPERAND
 498                || GET_CODE (next) == MATCH_OPERATOR
 499                || GET_CODE (next) == MATCH_PARALLEL
 500                || GET_CODE (next) == MATCH_OP_DUP
 501                || GET_CODE (next) == MATCH_DUP
 502                || GET_CODE (next) == PARALLEL)
 503         printf ("  emit (");
 504       else
 505         printf ("  emit_insn (");
 506       gen_exp (next);
 507       printf (");\n");
 508       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 509           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 510         printf ("  emit_barrier ();");
 511     }
 512
 513   /* Call `gen_sequence' to make a SEQUENCE out of all the
 514      insns emitted within this gen_... function.  */
 515
 516   printf ("  _val = gen_sequence ();\n");
 517   printf ("  end_sequence ();\n");
 518   printf ("  return _val;\n}\n\n");
 519 }
 520
 521 /* Like gen_expand, but generates a SEQUENCE.  */
 522
 523 static void
 524 gen_split (split)
 525      rtx split;
 526 {
 527   register int i;
 528   int operands;
 529
 530   if (XVEC (split, 0) == 0)
 531     fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
 532   else if (XVEC (split, 2) == 0)
 533     fatal ("define_split (definition %d) lacks a replacement pattern",
 534            insn_index_number);
 535
 536   /* Find out how many operands this function has.  */
 537
 538   max_operand_vec (split, 2);
 539   operands = MAX (max_opno, max_dup_opno) + 1;
 540
 541   /* Output the function name and argument declarations.  */
 542   printf ("rtx\ngen_split_%d (operands)\n     rtx *operands;\n",
 543           insn_code_number);
 544   printf ("{\n");
 545
 546   /* Declare all local variables.  */
 547   for (i = 0; i < operands; i++)
 548     printf ("  rtx operand%d;\n", i);
 549   printf ("  rtx _val = 0;\n");
 550   printf ("  start_sequence ();\n");
 551
 552   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 553      before the actual construction.  */
 554
 555   if (XSTR (split, 3))
 556     printf ("%s\n", XSTR (split, 3));
 557
 558   /* Output code to copy the arguments back out of `operands'  */
 559   for (i = 0; i < operands; i++)
 560     printf ("  operand%d = operands[%d];\n", i, i);
 561
 562   /* Output code to construct the rtl for the instruction bodies.
 563      Use emit_insn to add them to the sequence being accumulated.
 564      But don't do this if the user's code has set `no_more' nonzero.  */
 565
 566   for (i = 0; i < XVECLEN (split, 2); i++)
 567     {
 568       rtx next = XVECEXP (split, 2, i);
 569       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 570           || (GET_CODE (next) == PARALLEL
 571               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 572               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 573           || GET_CODE (next) == RETURN)
 574         printf ("  emit_jump_insn (");
 575       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 576                || GET_CODE (next) == CALL
 577                || (GET_CODE (next) == PARALLEL
 578                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 579                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 580                || (GET_CODE (next) == PARALLEL
 581                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 582         printf ("  emit_call_insn (");
 583       else if (GET_CODE (next) == CODE_LABEL)
 584         printf ("  emit_label (");
 585       else if (GET_CODE (next) == MATCH_OPERAND
 586                || GET_CODE (next) == MATCH_OPERATOR
 587                || GET_CODE (next) == MATCH_PARALLEL
 588                || GET_CODE (next) == MATCH_OP_DUP
 589                || GET_CODE (next) == MATCH_DUP
 590                || GET_CODE (next) == PARALLEL)
 591         printf ("  emit (");
 592       else
 593         printf ("  emit_insn (");
 594       gen_exp (next);
 595       printf (");\n");
 596       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 597           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 598         printf ("  emit_barrier ();");
 599     }
 600
 601   /* Call `gen_sequence' to make a SEQUENCE out of all the
 602      insns emitted within this gen_... function.  */
 603
 604   printf ("  _val = gen_sequence ();\n");
 605   printf ("  end_sequence ();\n");
 606   printf ("  return _val;\n}\n\n");
 607 }
 608 \f
 609 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 610    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 611    the end of the vector.  */
 612
 613 static void
 614 output_add_clobbers ()
 615 {
 616   struct clobber_pat *clobber;
 617   struct clobber_ent *ent;
 618   int i;
 619
 620   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 621   printf ("     rtx pattern;\n     int insn_code_number;\n");
 622   printf ("{\n");
 623   printf ("  switch (insn_code_number)\n");
 624   printf ("    {\n");
 625
 626   for (clobber = clobber_list; clobber; clobber = clobber->next)
 627     {
 628       for (ent = clobber->insns; ent; ent = ent->next)
 629         printf ("    case %d:\n", ent->code_number);
 630
 631       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 632         {
 633           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 634           gen_exp (XVECEXP (clobber->pattern, 1, i));
 635           printf (";\n");
 636         }
 637
 638       printf ("      break;\n\n");
 639     }
 640
 641   printf ("    default:\n");
 642   printf ("      abort ();\n");
 643   printf ("    }\n");
 644   printf ("}\n");
 645 }
 646 \f
 647 /* Write a function, init_mov_optab, that is called to set up entries
 648    in mov_optab for EXTRA_CC_MODES.  */
 649
 650 static void
 651 output_init_mov_optab ()
 652 {
 653 #ifdef EXTRA_CC_NAMES
 654   static char *cc_names[] = { EXTRA_CC_NAMES };
 655   char *p;
 656   size_t i;
 657
 658   printf ("\nvoid\ninit_mov_optab ()\n{\n");
 659
 660   for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
 661     {
 662       printf ("#ifdef HAVE_mov");
 663       for (p = cc_names[i]; *p; p++)
 664         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 665       printf ("\n");
 666       printf ("  if (HAVE_mov");
 667       for (p = cc_names[i]; *p; p++)
 668         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 669       printf (")\n");
 670       printf ("    mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
 671               cc_names[i]);
 672       for (p = cc_names[i]; *p; p++)
 673         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 674       printf (";\n#endif\n");
 675     }
 676
 677   printf ("}\n");
 678 #endif
 679 }
 680 \f
 681 PTR
 682 xmalloc (size)
 683   size_t size;
 684 {
 685   register PTR val = (PTR) malloc (size);
 686
 687   if (val == 0)
 688     fatal ("virtual memory exhausted");
 689
 690   return val;
 691 }
 692
 693 PTR
 694 xrealloc (old, size)
 695   PTR old;
 696   size_t size;
 697 {
 698   register PTR ptr;
 699   if (old)
 700     ptr = (PTR) realloc (old, size);
 701   else
 702     ptr = (PTR) malloc (size);
 703   if (!ptr)
 704     fatal ("virtual memory exhausted");
 705   return ptr;
 706 }
 707
 708 void
 709 fatal VPROTO ((const char *format, ...))
 710 {
 711 #ifndef ANSI_PROTOTYPES
 712   const char *format;
 713 #endif
 714   va_list ap;
 715
 716   VA_START (ap, format);
 717
 718 #ifndef ANSI_PROTOTYPES
 719   format = va_arg (ap, const char *);
 720 #endif
 721
 722   fprintf (stderr, "genemit: ");
 723   vfprintf (stderr, format, ap);
 724   va_end (ap);
 725   fprintf (stderr, "\n");
 726   exit (FATAL_EXIT_CODE);
 727 }
 728
 729 /* More 'friendly' abort that prints the line and file.
 730    config.h can #define abort fancy_abort if you like that sort of thing.  */
 731
 732 void
 733 fancy_abort ()
 734 {
 735   fatal ("Internal gcc abort.");
 736 }
 737 \f
 738 int
 739 main (argc, argv)
 740      int argc;
 741      char **argv;
 742 {
 743   rtx desc;
 744   FILE *infile;
 745   register int c;
 746
 747   obstack_init (rtl_obstack);
 748
 749   if (argc <= 1)
 750     fatal ("No input file name.");
 751
 752   infile = fopen (argv[1], "r");
 753   if (infile == 0)
 754     {
 755       perror (argv[1]);
 756       exit (FATAL_EXIT_CODE);
 757     }
 758
 759   init_rtl ();
 760
 761   /* Assign sequential codes to all entries in the machine description
 762      in parallel with the tables in insn-output.c.  */
 763
 764   insn_code_number = 0;
 765   insn_index_number = 0;
 766
 767   printf ("/* Generated automatically by the program `genemit'\n\
 768 from the machine description file `md'.  */\n\n");
 769
 770   printf ("#include \"config.h\"\n");
 771   printf ("#include \"system.h\"\n");
 772   printf ("#include \"rtl.h\"\n");
 773   printf ("#include \"expr.h\"\n");
 774   printf ("#include \"real.h\"\n");
 775   printf ("#include \"flags.h\"\n");
 776   printf ("#include \"output.h\"\n");
 777   printf ("#include \"insn-config.h\"\n");
 778   printf ("#include \"insn-flags.h\"\n");
 779   printf ("#include \"insn-codes.h\"\n");
 780   printf ("#include \"recog.h\"\n");
 781   printf ("#include \"reload.h\"\n\n");
 782   printf ("extern rtx recog_operand[];\n");
 783   printf ("#define operands emit_operand\n\n");
 784   printf ("#define FAIL return (end_sequence (), _val)\n");
 785   printf ("#define DONE return (_val = gen_sequence (), end_sequence (), _val)\n");
 786
 787   /* Read the machine description.  */
 788
 789   while (1)
 790     {
 791       c = read_skip_spaces (infile);
 792       if (c == EOF)
 793         break;
 794       ungetc (c, infile);
 795
 796       desc = read_rtx (infile);
 797       if (GET_CODE (desc) == DEFINE_INSN)
 798         {
 799           gen_insn (desc);
 800           ++insn_code_number;
 801         }
 802       if (GET_CODE (desc) == DEFINE_EXPAND)
 803         {
 804           gen_expand (desc);
 805           ++insn_code_number;
 806         }
 807       if (GET_CODE (desc) == DEFINE_SPLIT)
 808         {
 809           gen_split (desc);
 810           ++insn_code_number;
 811         }
 812       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
 813         {
 814           ++insn_code_number;
 815         }
 816       ++insn_index_number;
 817     }
 818
 819   /* Write out the routine to add CLOBBERs to a pattern.  */
 820   output_add_clobbers ();
 821
 822   /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES.  */
 823   output_init_mov_optab ();
 824
 825   fflush (stdout);
 826   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 827   /* NOTREACHED */
 828   return 0;
 829 }