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 #ifdef __STDC__
  24 #include <stdarg.h>
  25 #else
  26 #include <varargs.h>
  27 #endif
  28 #include "system.h"
  29 #include "rtl.h"
  30 #include "obstack.h"
  31
  32 static struct obstack obstack;
  33 struct obstack *rtl_obstack = &obstack;
  34
  35 #define obstack_chunk_alloc xmalloc
  36 #define obstack_chunk_free free
  37
  38 char *xmalloc PROTO((unsigned));
  39 static void fatal PVPROTO ((char *, ...)) ATTRIBUTE_PRINTF_1;
  40 void fancy_abort PROTO((void));
  41
  42 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
  43 char **insn_name_ptr = 0;
  44
  45 static int max_opno;
  46 static int max_dup_opno;
  47 static int register_constraints;
  48 static int insn_code_number;
  49 static int insn_index_number;
  50
  51 /* Data structure for recording the patterns of insns that have CLOBBERs.
  52    We use this to output a function that adds these CLOBBERs to a
  53    previously-allocated PARALLEL expression.  */
  54
  55 struct clobber_pat
  56 {
  57   struct clobber_ent *insns;
  58   rtx pattern;
  59   int first_clobber;
  60   struct clobber_pat *next;
  61 } *clobber_list;
  62
  63 /* Records one insn that uses the clobber list.  */
  64
  65 struct clobber_ent
  66 {
  67   int code_number;              /* Counts only insns.  */
  68   struct clobber_ent *next;
  69 };
  70
  71 static void max_operand_1               PROTO((rtx));
  72 static int max_operand_vec              PROTO((rtx, int));
  73 static void print_code                  PROTO((RTX_CODE));
  74 static void gen_exp                     PROTO((rtx));
  75 static void gen_insn                    PROTO((rtx));
  76 static void gen_expand                  PROTO((rtx));
  77 static void gen_split                   PROTO((rtx));
  78 static void output_add_clobbers         PROTO((void));
  79 static void output_init_mov_optab       PROTO((void));
  80
  81 \f
  82 static void
  83 max_operand_1 (x)
  84      rtx x;
  85 {
  86   register RTX_CODE code;
  87   register int i;
  88   register int len;
  89   register char *fmt;
  90
  91   if (x == 0)
  92     return;
  93
  94   code = GET_CODE (x);
  95
  96   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  97     register_constraints = 1;
  98   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  99     register_constraints = 1;
 100   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
 101       || code == MATCH_PARALLEL)
 102     max_opno = MAX (max_opno, XINT (x, 0));
 103   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
 104     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
 105
 106   fmt = GET_RTX_FORMAT (code);
 107   len = GET_RTX_LENGTH (code);
 108   for (i = 0; i < len; i++)
 109     {
 110       if (fmt[i] == 'e' || fmt[i] == 'u')
 111         max_operand_1 (XEXP (x, i));
 112       else if (fmt[i] == 'E')
 113         {
 114           int j;
 115           for (j = 0; j < XVECLEN (x, i); j++)
 116             max_operand_1 (XVECEXP (x, i, j));
 117         }
 118     }
 119 }
 120
 121 static int
 122 max_operand_vec (insn, arg)
 123      rtx insn;
 124      int arg;
 125 {
 126   register int len = XVECLEN (insn, arg);
 127   register int i;
 128
 129   max_opno = -1;
 130   max_dup_opno = -1;
 131
 132   for (i = 0; i < len; i++)
 133     max_operand_1 (XVECEXP (insn, arg, i));
 134
 135   return max_opno + 1;
 136 }
 137 \f
 138 static void
 139 print_code (code)
 140      RTX_CODE code;
 141 {
 142   register char *p1;
 143   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 144     {
 145       if (*p1 >= 'a' && *p1 <= 'z')
 146         putchar (*p1 + 'A' - 'a');
 147       else
 148         putchar (*p1);
 149     }
 150 }
 151
 152 /* Print a C expression to construct an RTX just like X,
 153    substituting any operand references appearing within.  */
 154
 155 static void
 156 gen_exp (x)
 157      rtx x;
 158 {
 159   register RTX_CODE code;
 160   register int i;
 161   register int len;
 162   register char *fmt;
 163
 164   if (x == 0)
 165     {
 166       printf ("NULL_RTX");
 167       return;
 168     }
 169
 170   code = GET_CODE (x);
 171
 172   switch (code)
 173     {
 174     case MATCH_OPERAND:
 175     case MATCH_DUP:
 176       printf ("operand%d", XINT (x, 0));
 177       return;
 178
 179     case MATCH_OP_DUP:
 180       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 181       if (GET_MODE (x) == VOIDmode)
 182         printf ("GET_MODE (operand%d)", XINT (x, 0));
 183       else
 184         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 185       for (i = 0; i < XVECLEN (x, 1); i++)
 186         {
 187           printf (",\n\t\t");
 188           gen_exp (XVECEXP (x, 1, i));
 189         }
 190       printf (")");
 191       return;
 192
 193     case MATCH_OPERATOR:
 194       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 195       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 196       for (i = 0; i < XVECLEN (x, 2); i++)
 197         {
 198           printf (",\n\t\t");
 199           gen_exp (XVECEXP (x, 2, i));
 200         }
 201       printf (")");
 202       return;
 203
 204     case MATCH_PARALLEL:
 205     case MATCH_PAR_DUP:
 206       printf ("operand%d", XINT (x, 0));
 207       return;
 208
 209     case MATCH_SCRATCH:
 210       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 211       return;
 212
 213     case ADDRESS:
 214       fatal ("ADDRESS expression code used in named instruction pattern");
 215
 216     case PC:
 217       printf ("pc_rtx");
 218       return;
 219
 220     case CC0:
 221       printf ("cc0_rtx");
 222       return;
 223
 224     case CONST_INT:
 225       if (INTVAL (x) == 0)
 226         printf ("const0_rtx");
 227       else if (INTVAL (x) == 1)
 228         printf ("const1_rtx");
 229       else if (INTVAL (x) == -1)
 230         printf ("constm1_rtx");
 231       else if (INTVAL (x) == STORE_FLAG_VALUE)
 232         printf ("const_true_rtx");
 233       else
 234         {
 235           printf ("GEN_INT (");
 236           printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
 237           printf (")");
 238         }
 239       return;
 240
 241     case CONST_DOUBLE:
 242       /* These shouldn't be written in MD files.  Instead, the appropriate
 243          routines in varasm.c should be called.  */
 244       abort ();
 245
 246     default:
 247       break;
 248     }
 249
 250   printf ("gen_rtx_");
 251   print_code (code);
 252   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 253
 254   fmt = GET_RTX_FORMAT (code);
 255   len = GET_RTX_LENGTH (code);
 256   for (i = 0; i < len; i++)
 257     {
 258       if (fmt[i] == '0')
 259         break;
 260       printf (",\n\t");
 261       if (fmt[i] == 'e' || fmt[i] == 'u')
 262         gen_exp (XEXP (x, i));
 263       else if (fmt[i] == 'i')
 264         printf ("%u", XINT (x, i));
 265       else if (fmt[i] == 's')
 266         printf ("\"%s\"", XSTR (x, i));
 267       else if (fmt[i] == 'E')
 268         {
 269           int j;
 270           printf ("gen_rtvec (%d", XVECLEN (x, i));
 271           for (j = 0; j < XVECLEN (x, i); j++)
 272             {
 273               printf (",\n\t\t");
 274               gen_exp (XVECEXP (x, i, j));
 275             }
 276           printf (")");
 277         }
 278       else
 279         abort ();
 280     }
 281   printf (")");
 282 }
 283 \f
 284 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 285
 286 static void
 287 gen_insn (insn)
 288      rtx insn;
 289 {
 290   int operands;
 291   register int i;
 292
 293   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 294      registers or MATCH_SCRATCHes.  If so, store away the information for
 295      later.  */
 296
 297   if (XVEC (insn, 1))
 298     {
 299       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 300         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 301             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 302                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 303           break;
 304
 305       if (i != XVECLEN (insn, 1) - 1)
 306         {
 307           register struct clobber_pat *p;
 308           register struct clobber_ent *link
 309             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 310           register int j;
 311
 312           link->code_number = insn_code_number;
 313
 314           /* See if any previous CLOBBER_LIST entry is the same as this
 315              one.  */
 316
 317           for (p = clobber_list; p; p = p->next)
 318             {
 319               if (p->first_clobber != i + 1
 320                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 321                 continue;
 322
 323               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 324                 {
 325                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 326                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 327
 328                   /* OLD and NEW are the same if both are to be a SCRATCH
 329                      of the same mode,
 330                      or if both are registers of the same mode and number.  */
 331                   if (! (GET_MODE (old) == GET_MODE (new)
 332                          && ((GET_CODE (old) == MATCH_SCRATCH
 333                               && GET_CODE (new) == MATCH_SCRATCH)
 334                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 335                                  && REGNO (old) == REGNO (new)))))
 336                     break;
 337                 }
 338
 339               if (j == XVECLEN (insn, 1))
 340                 break;
 341             }
 342
 343           if (p == 0)
 344             {
 345               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 346
 347               p->insns = 0;
 348               p->pattern = insn;
 349               p->first_clobber = i + 1;
 350               p->next = clobber_list;
 351               clobber_list = p;
 352             }
 353
 354           link->next = p->insns;
 355           p->insns = link;
 356         }
 357     }
 358
 359   /* Don't mention instructions whose names are the null string
 360      or begin with '*'.  They are in the machine description just
 361      to be recognized.  */
 362   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 363     return;
 364
 365   /* Find out how many operands this function has,
 366      and also whether any of them have register constraints.  */
 367   register_constraints = 0;
 368   operands = max_operand_vec (insn, 1);
 369   if (max_dup_opno >= operands)
 370     fatal ("match_dup operand number has no match_operand");
 371
 372   /* Output the function name and argument declarations.  */
 373   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 374   for (i = 0; i < operands; i++)
 375     printf (i ? ", operand%d" : "operand%d", i);
 376   printf (")\n");
 377   for (i = 0; i < operands; i++)
 378     printf ("     rtx operand%d;\n", i);
 379   printf ("{\n");
 380
 381   /* Output code to construct and return the rtl for the instruction body */
 382
 383   if (XVECLEN (insn, 1) == 1)
 384     {
 385       printf ("  return ");
 386       gen_exp (XVECEXP (insn, 1, 0));
 387       printf (";\n}\n\n");
 388     }
 389   else
 390     {
 391       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
 392       for (i = 0; i < XVECLEN (insn, 1); i++)
 393         {
 394           printf (",\n\t\t");
 395           gen_exp (XVECEXP (insn, 1, i));
 396         }
 397       printf ("));\n}\n\n");
 398     }
 399 }
 400 \f
 401 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 402
 403 static void
 404 gen_expand (expand)
 405      rtx expand;
 406 {
 407   int operands;
 408   register int i;
 409
 410   if (strlen (XSTR (expand, 0)) == 0)
 411     fatal ("define_expand lacks a name");
 412   if (XVEC (expand, 1) == 0)
 413     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 414
 415   /* Find out how many operands this function has,
 416      and also whether any of them have register constraints.  */
 417   register_constraints = 0;
 418
 419   operands = max_operand_vec (expand, 1);
 420
 421   /* Output the function name and argument declarations.  */
 422   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 423   for (i = 0; i < operands; i++)
 424     printf (i ? ", operand%d" : "operand%d", i);
 425   printf (")\n");
 426   for (i = 0; i < operands; i++)
 427     printf ("     rtx operand%d;\n", i);
 428   printf ("{\n");
 429
 430   /* If we don't have any C code to write, only one insn is being written,
 431      and no MATCH_DUPs are present, we can just return the desired insn
 432      like we do for a DEFINE_INSN.  This saves memory.  */
 433   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 434       && operands > max_dup_opno
 435       && XVECLEN (expand, 1) == 1)
 436     {
 437       printf ("  return ");
 438       gen_exp (XVECEXP (expand, 1, 0));
 439       printf (";\n}\n\n");
 440       return;
 441     }
 442
 443   /* For each operand referred to only with MATCH_DUPs,
 444      make a local variable.  */
 445   for (i = operands; i <= max_dup_opno; i++)
 446     printf ("  rtx operand%d;\n", i);
 447   if (operands > 0 || max_dup_opno >= 0)
 448     printf ("  rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
 449   printf ("  rtx _val = 0;\n");
 450   printf ("  start_sequence ();\n");
 451
 452   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 453      before the actual construction.
 454      This code expects to refer to `operands'
 455      just as the output-code in a DEFINE_INSN does,
 456      but here `operands' is an automatic array.
 457      So copy the operand values there before executing it.  */
 458   if (XSTR (expand, 3) && *XSTR (expand, 3))
 459     {
 460       /* Output code to copy the arguments into `operands'.  */
 461       for (i = 0; i < operands; i++)
 462         printf ("  operands[%d] = operand%d;\n", i, i);
 463
 464       /* Output the special code to be executed before the sequence
 465          is generated.  */
 466       printf ("%s\n", XSTR (expand, 3));
 467
 468       /* Output code to copy the arguments back out of `operands'
 469          (unless we aren't going to use them at all).  */
 470       if (XVEC (expand, 1) != 0)
 471         {
 472           for (i = 0; i < operands; i++)
 473             printf ("  operand%d = operands[%d];\n", i, i);
 474           for (; i <= max_dup_opno; i++)
 475             printf ("  operand%d = operands[%d];\n", i, i);
 476         }
 477     }
 478
 479   /* Output code to construct the rtl for the instruction bodies.
 480      Use emit_insn to add them to the sequence being accumulated.
 481      But don't do this if the user's code has set `no_more' nonzero.  */
 482
 483   for (i = 0; i < XVECLEN (expand, 1); i++)
 484     {
 485       rtx next = XVECEXP (expand, 1, i);
 486       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 487           || (GET_CODE (next) == PARALLEL
 488               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 489               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 490           || GET_CODE (next) == RETURN)
 491         printf ("  emit_jump_insn (");
 492       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 493                || GET_CODE (next) == CALL
 494                || (GET_CODE (next) == PARALLEL
 495                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 496                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 497                || (GET_CODE (next) == PARALLEL
 498                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 499         printf ("  emit_call_insn (");
 500       else if (GET_CODE (next) == CODE_LABEL)
 501         printf ("  emit_label (");
 502       else if (GET_CODE (next) == MATCH_OPERAND
 503                || GET_CODE (next) == MATCH_OPERATOR
 504                || GET_CODE (next) == MATCH_PARALLEL
 505                || GET_CODE (next) == MATCH_OP_DUP
 506                || GET_CODE (next) == MATCH_DUP
 507                || GET_CODE (next) == PARALLEL)
 508         printf ("  emit (");
 509       else
 510         printf ("  emit_insn (");
 511       gen_exp (next);
 512       printf (");\n");
 513       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 514           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 515         printf ("  emit_barrier ();");
 516     }
 517
 518   /* Call `gen_sequence' to make a SEQUENCE out of all the
 519      insns emitted within this gen_... function.  */
 520
 521   printf ("  _val = gen_sequence ();\n");
 522   printf ("  end_sequence ();\n");
 523   printf ("  return _val;\n}\n\n");
 524 }
 525
 526 /* Like gen_expand, but generates a SEQUENCE.  */
 527
 528 static void
 529 gen_split (split)
 530      rtx split;
 531 {
 532   register int i;
 533   int operands;
 534
 535   if (XVEC (split, 0) == 0)
 536     fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
 537   else if (XVEC (split, 2) == 0)
 538     fatal ("define_split (definition %d) lacks a replacement pattern",
 539            insn_index_number);
 540
 541   /* Find out how many operands this function has.  */
 542
 543   max_operand_vec (split, 2);
 544   operands = MAX (max_opno, max_dup_opno) + 1;
 545
 546   /* Output the function name and argument declarations.  */
 547   printf ("rtx\ngen_split_%d (operands)\n     rtx *operands;\n",
 548           insn_code_number);
 549   printf ("{\n");
 550
 551   /* Declare all local variables.  */
 552   for (i = 0; i < operands; i++)
 553     printf ("  rtx operand%d;\n", i);
 554   printf ("  rtx _val = 0;\n");
 555   printf ("  start_sequence ();\n");
 556
 557   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 558      before the actual construction.  */
 559
 560   if (XSTR (split, 3))
 561     printf ("%s\n", XSTR (split, 3));
 562
 563   /* Output code to copy the arguments back out of `operands'  */
 564   for (i = 0; i < operands; i++)
 565     printf ("  operand%d = operands[%d];\n", i, i);
 566
 567   /* Output code to construct the rtl for the instruction bodies.
 568      Use emit_insn to add them to the sequence being accumulated.
 569      But don't do this if the user's code has set `no_more' nonzero.  */
 570
 571   for (i = 0; i < XVECLEN (split, 2); i++)
 572     {
 573       rtx next = XVECEXP (split, 2, i);
 574       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 575           || (GET_CODE (next) == PARALLEL
 576               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 577               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 578           || GET_CODE (next) == RETURN)
 579         printf ("  emit_jump_insn (");
 580       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 581                || GET_CODE (next) == CALL
 582                || (GET_CODE (next) == PARALLEL
 583                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 584                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 585                || (GET_CODE (next) == PARALLEL
 586                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 587         printf ("  emit_call_insn (");
 588       else if (GET_CODE (next) == CODE_LABEL)
 589         printf ("  emit_label (");
 590       else if (GET_CODE (next) == MATCH_OPERAND
 591                || GET_CODE (next) == MATCH_OPERATOR
 592                || GET_CODE (next) == MATCH_PARALLEL
 593                || GET_CODE (next) == MATCH_OP_DUP
 594                || GET_CODE (next) == MATCH_DUP
 595                || GET_CODE (next) == PARALLEL)
 596         printf ("  emit (");
 597       else
 598         printf ("  emit_insn (");
 599       gen_exp (next);
 600       printf (");\n");
 601       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 602           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 603         printf ("  emit_barrier ();");
 604     }
 605
 606   /* Call `gen_sequence' to make a SEQUENCE out of all the
 607      insns emitted within this gen_... function.  */
 608
 609   printf ("  _val = gen_sequence ();\n");
 610   printf ("  end_sequence ();\n");
 611   printf ("  return _val;\n}\n\n");
 612 }
 613 \f
 614 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 615    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 616    the end of the vector.  */
 617
 618 static void
 619 output_add_clobbers ()
 620 {
 621   struct clobber_pat *clobber;
 622   struct clobber_ent *ent;
 623   int i;
 624
 625   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 626   printf ("     rtx pattern;\n     int insn_code_number;\n");
 627   printf ("{\n");
 628   printf ("  switch (insn_code_number)\n");
 629   printf ("    {\n");
 630
 631   for (clobber = clobber_list; clobber; clobber = clobber->next)
 632     {
 633       for (ent = clobber->insns; ent; ent = ent->next)
 634         printf ("    case %d:\n", ent->code_number);
 635
 636       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 637         {
 638           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 639           gen_exp (XVECEXP (clobber->pattern, 1, i));
 640           printf (";\n");
 641         }
 642
 643       printf ("      break;\n\n");
 644     }
 645
 646   printf ("    default:\n");
 647   printf ("      abort ();\n");
 648   printf ("    }\n");
 649   printf ("}\n");
 650 }
 651 \f
 652 /* Write a function, init_mov_optab, that is called to set up entries
 653    in mov_optab for EXTRA_CC_MODES.  */
 654
 655 static void
 656 output_init_mov_optab ()
 657 {
 658 #ifdef EXTRA_CC_NAMES
 659   static char *cc_names[] = { EXTRA_CC_NAMES };
 660   char *p;
 661   size_t i;
 662
 663   printf ("\nvoid\ninit_mov_optab ()\n{\n");
 664
 665   for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
 666     {
 667       printf ("#ifdef HAVE_mov");
 668       for (p = cc_names[i]; *p; p++)
 669         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 670       printf ("\n");
 671       printf ("  if (HAVE_mov");
 672       for (p = cc_names[i]; *p; p++)
 673         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 674       printf (")\n");
 675       printf ("    mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
 676               cc_names[i]);
 677       for (p = cc_names[i]; *p; p++)
 678         printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
 679       printf (";\n#endif\n");
 680     }
 681
 682   printf ("}\n");
 683 #endif
 684 }
 685 \f
 686 char *
 687 xmalloc (size)
 688      unsigned size;
 689 {
 690   register char *val = (char *) malloc (size);
 691
 692   if (val == 0)
 693     fatal ("virtual memory exhausted");
 694
 695   return val;
 696 }
 697
 698 char *
 699 xrealloc (ptr, size)
 700      char *ptr;
 701      unsigned size;
 702 {
 703   char *result = (char *) realloc (ptr, size);
 704   if (!result)
 705     fatal ("virtual memory exhausted");
 706   return result;
 707 }
 708
 709 static void
 710 fatal VPROTO ((char *format, ...))
 711 {
 712 #ifndef __STDC__
 713   char *format;
 714 #endif
 715   va_list ap;
 716
 717   VA_START (ap, format);
 718
 719 #ifndef __STDC__
 720   format = va_arg (ap, char *);
 721 #endif
 722
 723   fprintf (stderr, "genemit: ");
 724   vfprintf (stderr, format, ap);
 725   va_end (ap);
 726   fprintf (stderr, "\n");
 727   exit (FATAL_EXIT_CODE);
 728 }
 729
 730 /* More 'friendly' abort that prints the line and file.
 731    config.h can #define abort fancy_abort if you like that sort of thing.  */
 732
 733 void
 734 fancy_abort ()
 735 {
 736   fatal ("Internal gcc abort.");
 737 }
 738 \f
 739 int
 740 main (argc, argv)
 741      int argc;
 742      char **argv;
 743 {
 744   rtx desc;
 745   FILE *infile;
 746   register int c;
 747
 748   obstack_init (rtl_obstack);
 749
 750   if (argc <= 1)
 751     fatal ("No input file name.");
 752
 753   infile = fopen (argv[1], "r");
 754   if (infile == 0)
 755     {
 756       perror (argv[1]);
 757       exit (FATAL_EXIT_CODE);
 758     }
 759
 760   init_rtl ();
 761
 762   /* Assign sequential codes to all entries in the machine description
 763      in parallel with the tables in insn-output.c.  */
 764
 765   insn_code_number = 0;
 766   insn_index_number = 0;
 767
 768   printf ("/* Generated automatically by the program `genemit'\n\
 769 from the machine description file `md'.  */\n\n");
 770
 771   printf ("#include \"config.h\"\n");
 772   printf ("#include \"system.h\"\n");
 773   printf ("#include \"rtl.h\"\n");
 774   printf ("#include \"expr.h\"\n");
 775   printf ("#include \"real.h\"\n");
 776   printf ("#include \"flags.h\"\n");
 777   printf ("#include \"output.h\"\n");
 778   printf ("#include \"insn-config.h\"\n\n");
 779   printf ("#include \"insn-flags.h\"\n\n");
 780   printf ("#include \"insn-codes.h\"\n\n");
 781   printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
 782   printf ("extern rtx recog_operand[];\n");
 783   printf ("#define operands emit_operand\n\n");
 784   printf ("#define FAIL do {end_sequence (); return _val;} while (0)\n");
 785   printf ("#define DONE do {_val = gen_sequence (); end_sequence (); return _val;} while (0)\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 }