gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 1988, 1991, 1994, 1995, 1997, 1998, 1999, 2000, 2001,
   3    2003 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22
  23 #include "bconfig.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27 #include "rtl.h"
  28 #include "errors.h"
  29 #include "gensupport.h"
  30
  31
  32 static int max_opno;
  33 static int max_dup_opno;
  34 static int max_scratch_opno;
  35 static int insn_code_number;
  36 static int insn_index_number;
  37
  38 /* Data structure for recording the patterns of insns that have CLOBBERs.
  39    We use this to output a function that adds these CLOBBERs to a
  40    previously-allocated PARALLEL expression.  */
  41
  42 struct clobber_pat
  43 {
  44   struct clobber_ent *insns;
  45   rtx pattern;
  46   int first_clobber;
  47   struct clobber_pat *next;
  48   int has_hard_reg;
  49 } *clobber_list;
  50
  51 /* Records one insn that uses the clobber list.  */
  52
  53 struct clobber_ent
  54 {
  55   int code_number;              /* Counts only insns.  */
  56   struct clobber_ent *next;
  57 };
  58
  59 static void max_operand_1               (rtx);
  60 static int max_operand_vec              (rtx, int);
  61 static void print_code                  (RTX_CODE);
  62 static void gen_exp                     (rtx, enum rtx_code, char *);
  63 static void gen_insn                    (rtx, int);
  64 static void gen_expand                  (rtx);
  65 static void gen_split                   (rtx);
  66 static void output_add_clobbers         (void);
  67 static void output_added_clobbers_hard_reg_p (void);
  68 static void gen_rtx_scratch             (rtx, enum rtx_code);
  69 static void output_peephole2_scratches  (rtx);
  70
  71 \f
  72 static void
  73 max_operand_1 (rtx x)
  74 {
  75   RTX_CODE code;
  76   int i;
  77   int len;
  78   const char *fmt;
  79
  80   if (x == 0)
  81     return;
  82
  83   code = GET_CODE (x);
  84
  85   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  86       || code == MATCH_PARALLEL)
  87     max_opno = MAX (max_opno, XINT (x, 0));
  88   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  89     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  90   if (code == MATCH_SCRATCH)
  91     max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
  92
  93   fmt = GET_RTX_FORMAT (code);
  94   len = GET_RTX_LENGTH (code);
  95   for (i = 0; i < len; i++)
  96     {
  97       if (fmt[i] == 'e' || fmt[i] == 'u')
  98         max_operand_1 (XEXP (x, i));
  99       else if (fmt[i] == 'E')
 100         {
 101           int j;
 102           for (j = 0; j < XVECLEN (x, i); j++)
 103             max_operand_1 (XVECEXP (x, i, j));
 104         }
 105     }
 106 }
 107
 108 static int
 109 max_operand_vec (rtx insn, int arg)
 110 {
 111   int len = XVECLEN (insn, arg);
 112   int i;
 113
 114   max_opno = -1;
 115   max_dup_opno = -1;
 116   max_scratch_opno = -1;
 117
 118   for (i = 0; i < len; i++)
 119     max_operand_1 (XVECEXP (insn, arg, i));
 120
 121   return max_opno + 1;
 122 }
 123 \f
 124 static void
 125 print_code (RTX_CODE code)
 126 {
 127   const char *p1;
 128   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 129     putchar (TOUPPER(*p1));
 130 }
 131
 132 static void
 133 gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
 134 {
 135   if (subroutine_type == DEFINE_PEEPHOLE2)
 136     {
 137       printf ("operand%d", XINT (x, 0));
 138     }
 139   else
 140     {
 141       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 142     }
 143 }
 144
 145 /* Print a C expression to construct an RTX just like X,
 146    substituting any operand references appearing within.  */
 147
 148 static void
 149 gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
 150 {
 151   RTX_CODE code;
 152   int i;
 153   int len;
 154   const char *fmt;
 155
 156   if (x == 0)
 157     {
 158       printf ("NULL_RTX");
 159       return;
 160     }
 161
 162   code = GET_CODE (x);
 163
 164   switch (code)
 165     {
 166     case MATCH_OPERAND:
 167     case MATCH_DUP:
 168       if (used)
 169         {
 170           if (used[XINT (x, 0)])
 171             {
 172               printf ("copy_rtx (operand%d)", XINT (x, 0));
 173               return;
 174             }
 175           used[XINT (x, 0)] = 1;
 176         }
 177       printf ("operand%d", XINT (x, 0));
 178       return;
 179
 180     case MATCH_OP_DUP:
 181       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 182       if (GET_MODE (x) == VOIDmode)
 183         printf ("GET_MODE (operand%d)", XINT (x, 0));
 184       else
 185         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 186       for (i = 0; i < XVECLEN (x, 1); i++)
 187         {
 188           printf (",\n\t\t");
 189           gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
 190         }
 191       printf (")");
 192       return;
 193
 194     case MATCH_OPERATOR:
 195       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 196       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 197       for (i = 0; i < XVECLEN (x, 2); i++)
 198         {
 199           printf (",\n\t\t");
 200           gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
 201         }
 202       printf (")");
 203       return;
 204
 205     case MATCH_PARALLEL:
 206     case MATCH_PAR_DUP:
 207       printf ("operand%d", XINT (x, 0));
 208       return;
 209
 210     case MATCH_SCRATCH:
 211       gen_rtx_scratch (x, subroutine_type);
 212       return;
 213
 214     case ADDRESS:
 215       fatal ("ADDRESS expression code used in named instruction pattern");
 216
 217     case PC:
 218       printf ("pc_rtx");
 219       return;
 220
 221     case CC0:
 222       printf ("cc0_rtx");
 223       return;
 224
 225     case CONST_INT:
 226       if (INTVAL (x) == 0)
 227         printf ("const0_rtx");
 228       else if (INTVAL (x) == 1)
 229         printf ("const1_rtx");
 230       else if (INTVAL (x) == -1)
 231         printf ("constm1_rtx");
 232       else if (INTVAL (x) == STORE_FLAG_VALUE)
 233         printf ("const_true_rtx");
 234       else
 235         {
 236           printf ("GEN_INT (");
 237           printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
 238           printf (")");
 239         }
 240       return;
 241
 242     case CONST_DOUBLE:
 243       /* These shouldn't be written in MD files.  Instead, the appropriate
 244          routines in varasm.c should be called.  */
 245       abort ();
 246
 247     default:
 248       break;
 249     }
 250
 251   printf ("gen_rtx_");
 252   print_code (code);
 253   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 254
 255   fmt = GET_RTX_FORMAT (code);
 256   len = GET_RTX_LENGTH (code);
 257   for (i = 0; i < len; i++)
 258     {
 259       if (fmt[i] == '0')
 260         break;
 261       printf (",\n\t");
 262       if (fmt[i] == 'e' || fmt[i] == 'u')
 263         gen_exp (XEXP (x, i), subroutine_type, used);
 264       else if (fmt[i] == 'i')
 265         printf ("%u", XINT (x, i));
 266       else if (fmt[i] == 's')
 267         printf ("\"%s\"", XSTR (x, i));
 268       else if (fmt[i] == 'E')
 269         {
 270           int j;
 271           printf ("gen_rtvec (%d", XVECLEN (x, i));
 272           for (j = 0; j < XVECLEN (x, i); j++)
 273             {
 274               printf (",\n\t\t");
 275               gen_exp (XVECEXP (x, i, j), subroutine_type, used);
 276             }
 277           printf (")");
 278         }
 279       else
 280         abort ();
 281     }
 282   printf (")");
 283 }
 284 \f
 285 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 286
 287 static void
 288 gen_insn (rtx insn, int lineno)
 289 {
 290   int operands;
 291   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       int has_hard_reg = 0;
 300
 301       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 302         {
 303           if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
 304             break;
 305
 306           if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) == REG)
 307             has_hard_reg = 1;
 308           else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
 309             break;
 310         }
 311
 312       if (i != XVECLEN (insn, 1) - 1)
 313         {
 314           struct clobber_pat *p;
 315           struct clobber_ent *link = xmalloc (sizeof (struct clobber_ent));
 316           int j;
 317
 318           link->code_number = insn_code_number;
 319
 320           /* See if any previous CLOBBER_LIST entry is the same as this
 321              one.  */
 322
 323           for (p = clobber_list; p; p = p->next)
 324             {
 325               if (p->first_clobber != i + 1
 326                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 327                 continue;
 328
 329               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 330                 {
 331                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 332                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 333
 334                   /* OLD and NEW are the same if both are to be a SCRATCH
 335                      of the same mode,
 336                      or if both are registers of the same mode and number.  */
 337                   if (! (GET_MODE (old) == GET_MODE (new)
 338                          && ((GET_CODE (old) == MATCH_SCRATCH
 339                               && GET_CODE (new) == MATCH_SCRATCH)
 340                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 341                                  && REGNO (old) == REGNO (new)))))
 342                     break;
 343                 }
 344
 345               if (j == XVECLEN (insn, 1))
 346                 break;
 347             }
 348
 349           if (p == 0)
 350             {
 351               p = xmalloc (sizeof (struct clobber_pat));
 352
 353               p->insns = 0;
 354               p->pattern = insn;
 355               p->first_clobber = i + 1;
 356               p->next = clobber_list;
 357               p->has_hard_reg = has_hard_reg;
 358               clobber_list = p;
 359             }
 360
 361           link->next = p->insns;
 362           p->insns = link;
 363         }
 364     }
 365
 366   /* Don't mention instructions whose names are the null string
 367      or begin with '*'.  They are in the machine description just
 368      to be recognized.  */
 369   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 370     return;
 371
 372   printf ("/* %s:%d */\n", read_rtx_filename, lineno);
 373
 374   /* Find out how many operands this function has.  */
 375   operands = max_operand_vec (insn, 1);
 376   if (max_dup_opno >= operands)
 377     fatal ("match_dup operand number has no match_operand");
 378
 379   /* Output the function name and argument declarations.  */
 380   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 381   if (operands)
 382     for (i = 0; i < operands; i++)
 383       if (i)
 384         printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
 385       else
 386         printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
 387   else
 388     printf ("void");
 389   printf (")\n");
 390   printf ("{\n");
 391
 392   /* Output code to construct and return the rtl for the instruction body */
 393
 394   if (XVECLEN (insn, 1) == 1)
 395     {
 396       printf ("  return ");
 397       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
 398       printf (";\n}\n\n");
 399     }
 400   else
 401     {
 402       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 403               XVECLEN (insn, 1));
 404
 405       for (i = 0; i < XVECLEN (insn, 1); i++)
 406         {
 407           printf (",\n\t\t");
 408           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, NULL);
 409         }
 410       printf ("));\n}\n\n");
 411     }
 412 }
 413 \f
 414 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 415
 416 static void
 417 gen_expand (rtx expand)
 418 {
 419   int operands;
 420   int i;
 421
 422   if (strlen (XSTR (expand, 0)) == 0)
 423     fatal ("define_expand lacks a name");
 424   if (XVEC (expand, 1) == 0)
 425     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 426
 427   /* Find out how many operands this function has.  */
 428   operands = max_operand_vec (expand, 1);
 429
 430   /* Output the function name and argument declarations.  */
 431   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 432   if (operands)
 433     for (i = 0; i < operands; i++)
 434       if (i)
 435         printf (",\n\trtx operand%d", i);
 436       else
 437         printf ("rtx operand%d", i);
 438   else
 439     printf ("void");
 440   printf (")\n");
 441   printf ("{\n");
 442
 443   /* If we don't have any C code to write, only one insn is being written,
 444      and no MATCH_DUPs are present, we can just return the desired insn
 445      like we do for a DEFINE_INSN.  This saves memory.  */
 446   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 447       && operands > max_dup_opno
 448       && XVECLEN (expand, 1) == 1)
 449     {
 450       printf ("  return ");
 451       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
 452       printf (";\n}\n\n");
 453       return;
 454     }
 455
 456   /* For each operand referred to only with MATCH_DUPs,
 457      make a local variable.  */
 458   for (i = operands; i <= max_dup_opno; i++)
 459     printf ("  rtx operand%d;\n", i);
 460   for (; i <= max_scratch_opno; i++)
 461     printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);
 462   printf ("  rtx _val = 0;\n");
 463   printf ("  start_sequence ();\n");
 464
 465   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 466      before the actual construction.
 467      This code expects to refer to `operands'
 468      just as the output-code in a DEFINE_INSN does,
 469      but here `operands' is an automatic array.
 470      So copy the operand values there before executing it.  */
 471   if (XSTR (expand, 3) && *XSTR (expand, 3))
 472     {
 473       printf ("  {\n");
 474       if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
 475         printf ("    rtx operands[%d];\n",
 476             MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 477       /* Output code to copy the arguments into `operands'.  */
 478       for (i = 0; i < operands; i++)
 479         printf ("    operands[%d] = operand%d;\n", i, i);
 480
 481       /* Output the special code to be executed before the sequence
 482          is generated.  */
 483       printf ("%s\n", XSTR (expand, 3));
 484
 485       /* Output code to copy the arguments back out of `operands'
 486          (unless we aren't going to use them at all).  */
 487       if (XVEC (expand, 1) != 0)
 488         {
 489           for (i = 0; i < operands; i++)
 490             printf ("    operand%d = operands[%d];\n", i, i);
 491           for (; i <= max_dup_opno; i++)
 492             printf ("    operand%d = operands[%d];\n", i, i);
 493           for (; i <= max_scratch_opno; i++)
 494             printf ("    operand%d = operands[%d];\n", i, i);
 495         }
 496       printf ("  }\n");
 497     }
 498
 499   /* Output code to construct the rtl for the instruction bodies.
 500      Use emit_insn to add them to the sequence being accumulated.
 501      But don't do this if the user's code has set `no_more' nonzero.  */
 502
 503   for (i = 0; i < XVECLEN (expand, 1); i++)
 504     {
 505       rtx next = XVECEXP (expand, 1, i);
 506       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 507           || (GET_CODE (next) == PARALLEL
 508               && ((GET_CODE (XVECEXP (next, 0, 0)) == SET
 509                    && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 510                   || GET_CODE (XVECEXP (next, 0, 0)) == RETURN))
 511           || GET_CODE (next) == RETURN)
 512         printf ("  emit_jump_insn (");
 513       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 514                || GET_CODE (next) == CALL
 515                || (GET_CODE (next) == PARALLEL
 516                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 517                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 518                || (GET_CODE (next) == PARALLEL
 519                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 520         printf ("  emit_call_insn (");
 521       else if (GET_CODE (next) == CODE_LABEL)
 522         printf ("  emit_label (");
 523       else if (GET_CODE (next) == MATCH_OPERAND
 524                || GET_CODE (next) == MATCH_DUP
 525                || GET_CODE (next) == MATCH_OPERATOR
 526                || GET_CODE (next) == MATCH_OP_DUP
 527                || GET_CODE (next) == MATCH_PARALLEL
 528                || GET_CODE (next) == MATCH_PAR_DUP
 529                || GET_CODE (next) == PARALLEL)
 530         printf ("  emit (");
 531       else
 532         printf ("  emit_insn (");
 533       gen_exp (next, DEFINE_EXPAND, NULL);
 534       printf (");\n");
 535       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 536           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 537         printf ("  emit_barrier ();");
 538     }
 539
 540   /* Call `get_insns' to extract the list of all the
 541      insns emitted within this gen_... function.  */
 542
 543   printf ("  _val = get_insns ();\n");
 544   printf ("  end_sequence ();\n");
 545   printf ("  return _val;\n}\n\n");
 546 }
 547
 548 /* Like gen_expand, but generates insns resulting from splitting SPLIT.  */
 549
 550 static void
 551 gen_split (rtx split)
 552 {
 553   int i;
 554   int operands;
 555   const char *const name =
 556     ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
 557   const char *unused;
 558   char *used;
 559
 560   if (XVEC (split, 0) == 0)
 561     fatal ("define_%s (definition %d) lacks a pattern", name,
 562            insn_index_number);
 563   else if (XVEC (split, 2) == 0)
 564     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 565            insn_index_number);
 566
 567   /* Find out how many operands this function has.  */
 568
 569   max_operand_vec (split, 2);
 570   operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
 571   unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
 572   used = xcalloc (1, operands);
 573
 574   /* Output the prototype, function name and argument declarations.  */
 575   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 576     {
 577       printf ("extern rtx gen_%s_%d (rtx, rtx *);\n",
 578               name, insn_code_number);
 579       printf ("rtx\ngen_%s_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 580               name, insn_code_number, unused);
 581     }
 582   else
 583     {
 584       printf ("extern rtx gen_split_%d (rtx *);\n", insn_code_number);
 585       printf ("rtx\ngen_%s_%d (rtx *operands%s)\n", name, insn_code_number, unused);
 586     }
 587   printf ("{\n");
 588
 589   /* Declare all local variables.  */
 590   for (i = 0; i < operands; i++)
 591     printf ("  rtx operand%d;\n", i);
 592   printf ("  rtx _val = 0;\n");
 593
 594   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 595     output_peephole2_scratches (split);
 596
 597   printf ("  start_sequence ();\n");
 598
 599   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 600      before the actual construction.  */
 601
 602   if (XSTR (split, 3))
 603     printf ("%s\n", XSTR (split, 3));
 604
 605   /* Output code to copy the arguments back out of `operands'  */
 606   for (i = 0; i < operands; i++)
 607     printf ("  operand%d = operands[%d];\n", i, i);
 608
 609   /* Output code to construct the rtl for the instruction bodies.
 610      Use emit_insn to add them to the sequence being accumulated.
 611      But don't do this if the user's code has set `no_more' nonzero.  */
 612
 613   for (i = 0; i < XVECLEN (split, 2); i++)
 614     {
 615       rtx next = XVECEXP (split, 2, i);
 616       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 617           || (GET_CODE (next) == PARALLEL
 618               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 619               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 620           || GET_CODE (next) == RETURN)
 621         printf ("  emit_jump_insn (");
 622       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 623                || GET_CODE (next) == CALL
 624                || (GET_CODE (next) == PARALLEL
 625                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 626                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 627                || (GET_CODE (next) == PARALLEL
 628                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 629         printf ("  emit_call_insn (");
 630       else if (GET_CODE (next) == CODE_LABEL)
 631         printf ("  emit_label (");
 632       else if (GET_CODE (next) == MATCH_OPERAND
 633                || GET_CODE (next) == MATCH_OPERATOR
 634                || GET_CODE (next) == MATCH_PARALLEL
 635                || GET_CODE (next) == MATCH_OP_DUP
 636                || GET_CODE (next) == MATCH_DUP
 637                || GET_CODE (next) == PARALLEL)
 638         printf ("  emit (");
 639       else
 640         printf ("  emit_insn (");
 641       gen_exp (next, GET_CODE (split), used);
 642       printf (");\n");
 643       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 644           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 645         printf ("  emit_barrier ();");
 646     }
 647
 648   /* Call `get_insns' to make a list of all the
 649      insns emitted within this gen_... function.  */
 650
 651   printf ("  _val = get_insns ();\n");
 652   printf ("  end_sequence ();\n");
 653   printf ("  return _val;\n}\n\n");
 654
 655   free (used);
 656 }
 657 \f
 658 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 659    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 660    the end of the vector.  */
 661
 662 static void
 663 output_add_clobbers (void)
 664 {
 665   struct clobber_pat *clobber;
 666   struct clobber_ent *ent;
 667   int i;
 668
 669   printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
 670   printf ("{\n");
 671   printf ("  switch (insn_code_number)\n");
 672   printf ("    {\n");
 673
 674   for (clobber = clobber_list; clobber; clobber = clobber->next)
 675     {
 676       for (ent = clobber->insns; ent; ent = ent->next)
 677         printf ("    case %d:\n", ent->code_number);
 678
 679       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 680         {
 681           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 682           gen_exp (XVECEXP (clobber->pattern, 1, i),
 683                    GET_CODE (clobber->pattern), NULL);
 684           printf (";\n");
 685         }
 686
 687       printf ("      break;\n\n");
 688     }
 689
 690   printf ("    default:\n");
 691   printf ("      abort ();\n");
 692   printf ("    }\n");
 693   printf ("}\n");
 694 }
 695 \f
 696 /* Write a function, `added_clobbers_hard_reg_p' this is given an insn_code
 697    number that needs clobbers and returns 1 if they include a clobber of a
 698    hard reg and 0 if they just clobber SCRATCH.  */
 699
 700 static void
 701 output_added_clobbers_hard_reg_p (void)
 702 {
 703   struct clobber_pat *clobber;
 704   struct clobber_ent *ent;
 705   int clobber_p, used;
 706
 707   printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
 708   printf ("{\n");
 709   printf ("  switch (insn_code_number)\n");
 710   printf ("    {\n");
 711
 712   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
 713     {
 714       used = 0;
 715       for (clobber = clobber_list; clobber; clobber = clobber->next)
 716         if (clobber->has_hard_reg == clobber_p)
 717           for (ent = clobber->insns; ent; ent = ent->next)
 718             {
 719               printf ("    case %d:\n", ent->code_number);
 720               used++;
 721             }
 722
 723       if (used)
 724         printf ("      return %d;\n\n", clobber_p);
 725     }
 726
 727   printf ("    default:\n");
 728   printf ("      abort ();\n");
 729   printf ("    }\n");
 730   printf ("}\n");
 731 }
 732 \f
 733 /* Generate code to invoke find_free_register () as needed for the
 734    scratch registers used by the peephole2 pattern in SPLIT.  */
 735
 736 static void
 737 output_peephole2_scratches (rtx split)
 738 {
 739   int i;
 740   int insn_nr = 0;
 741
 742   printf ("  HARD_REG_SET _regs_allocated;\n");
 743   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 744
 745   for (i = 0; i < XVECLEN (split, 0); i++)
 746     {
 747       rtx elt = XVECEXP (split, 0, i);
 748       if (GET_CODE (elt) == MATCH_SCRATCH)
 749         {
 750           int last_insn_nr = insn_nr;
 751           int cur_insn_nr = insn_nr;
 752           int j;
 753           for (j = i + 1; j < XVECLEN (split, 0); j++)
 754             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 755               {
 756                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 757                   last_insn_nr = cur_insn_nr;
 758               }
 759             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 760               cur_insn_nr++;
 761
 762           printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 763     return NULL;\n",
 764                   XINT (elt, 0),
 765                   insn_nr, last_insn_nr,
 766                   XSTR (elt, 1),
 767                   GET_MODE_NAME (GET_MODE (elt)));
 768
 769         }
 770       else if (GET_CODE (elt) != MATCH_DUP)
 771         insn_nr++;
 772     }
 773 }
 774
 775 int
 776 main (int argc, char **argv)
 777 {
 778   rtx desc;
 779
 780   progname = "genemit";
 781
 782   if (argc <= 1)
 783     fatal ("no input file name");
 784
 785   if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
 786     return (FATAL_EXIT_CODE);
 787
 788   /* Assign sequential codes to all entries in the machine description
 789      in parallel with the tables in insn-output.c.  */
 790
 791   insn_code_number = 0;
 792   insn_index_number = 0;
 793
 794   printf ("/* Generated automatically by the program `genemit'\n\
 795 from the machine description file `md'.  */\n\n");
 796
 797   printf ("#include \"config.h\"\n");
 798   printf ("#include \"system.h\"\n");
 799   printf ("#include \"coretypes.h\"\n");
 800   printf ("#include \"tm.h\"\n");
 801   printf ("#include \"rtl.h\"\n");
 802   printf ("#include \"tm_p.h\"\n");
 803   printf ("#include \"function.h\"\n");
 804   printf ("#include \"expr.h\"\n");
 805   printf ("#include \"optabs.h\"\n");
 806   printf ("#include \"real.h\"\n");
 807   printf ("#include \"flags.h\"\n");
 808   printf ("#include \"output.h\"\n");
 809   printf ("#include \"insn-config.h\"\n");
 810   printf ("#include \"hard-reg-set.h\"\n");
 811   printf ("#include \"recog.h\"\n");
 812   printf ("#include \"resource.h\"\n");
 813   printf ("#include \"reload.h\"\n");
 814   printf ("#include \"toplev.h\"\n");
 815   printf ("#include \"ggc.h\"\n\n");
 816   printf ("#define FAIL return (end_sequence (), _val)\n");
 817   printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
 818
 819   /* Read the machine description.  */
 820
 821   while (1)
 822     {
 823       int line_no;
 824
 825       desc = read_md_rtx (&line_no, &insn_code_number);
 826       if (desc == NULL)
 827         break;
 828
 829       switch (GET_CODE (desc))
 830         {
 831         case DEFINE_INSN:
 832           gen_insn (desc, line_no);
 833           break;
 834
 835         case DEFINE_EXPAND:
 836           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 837           gen_expand (desc);
 838           break;
 839
 840         case DEFINE_SPLIT:
 841           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 842           gen_split (desc);
 843           break;
 844
 845         case DEFINE_PEEPHOLE2:
 846           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 847           gen_split (desc);
 848           break;
 849
 850         default:
 851           break;
 852         }
 853       ++insn_index_number;
 854     }
 855
 856   /* Write out the routines to add CLOBBERs to a pattern and say whether they
 857      clobber a hard reg.  */
 858   output_add_clobbers ();
 859   output_added_clobbers_hard_reg_p ();
 860
 861   fflush (stdout);
 862   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 863 }
 864
 865 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 866 const char *
 867 get_insn_name (int code ATTRIBUTE_UNUSED)
 868 {
 869   return NULL;
 870 }