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, 2004, 2005, 2007 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "bconfig.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "rtl.h"
  27 #include "errors.h"
  28 #include "gensupport.h"
  29
  30
  31 static int max_opno;
  32 static int max_dup_opno;
  33 static int max_scratch_opno;
  34 static int insn_code_number;
  35 static int insn_index_number;
  36
  37 /* Data structure for recording the patterns of insns that have CLOBBERs.
  38    We use this to output a function that adds these CLOBBERs to a
  39    previously-allocated PARALLEL expression.  */
  40
  41 struct clobber_pat
  42 {
  43   struct clobber_ent *insns;
  44   rtx pattern;
  45   int first_clobber;
  46   struct clobber_pat *next;
  47   int has_hard_reg;
  48 } *clobber_list;
  49
  50 /* Records one insn that uses the clobber list.  */
  51
  52 struct clobber_ent
  53 {
  54   int code_number;              /* Counts only insns.  */
  55   struct clobber_ent *next;
  56 };
  57
  58 static void max_operand_1               (rtx);
  59 static int max_operand_vec              (rtx, int);
  60 static void print_code                  (RTX_CODE);
  61 static void gen_exp                     (rtx, enum rtx_code, char *);
  62 static void gen_insn                    (rtx, int);
  63 static void gen_expand                  (rtx);
  64 static void gen_split                   (rtx);
  65 static void output_add_clobbers         (void);
  66 static void output_added_clobbers_hard_reg_p (void);
  67 static void gen_rtx_scratch             (rtx, enum rtx_code);
  68 static void output_peephole2_scratches  (rtx);
  69
  70 \f
  71 static void
  72 max_operand_1 (rtx x)
  73 {
  74   RTX_CODE code;
  75   int i;
  76   int len;
  77   const char *fmt;
  78
  79   if (x == 0)
  80     return;
  81
  82   code = GET_CODE (x);
  83
  84   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  85       || code == MATCH_PARALLEL)
  86     max_opno = MAX (max_opno, XINT (x, 0));
  87   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  88     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  89   if (code == MATCH_SCRATCH)
  90     max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
  91
  92   fmt = GET_RTX_FORMAT (code);
  93   len = GET_RTX_LENGTH (code);
  94   for (i = 0; i < len; i++)
  95     {
  96       if (fmt[i] == 'e' || fmt[i] == 'u')
  97         max_operand_1 (XEXP (x, i));
  98       else if (fmt[i] == 'E')
  99         {
 100           int j;
 101           for (j = 0; j < XVECLEN (x, i); j++)
 102             max_operand_1 (XVECEXP (x, i, j));
 103         }
 104     }
 105 }
 106
 107 static int
 108 max_operand_vec (rtx insn, int arg)
 109 {
 110   int len = XVECLEN (insn, arg);
 111   int i;
 112
 113   max_opno = -1;
 114   max_dup_opno = -1;
 115   max_scratch_opno = -1;
 116
 117   for (i = 0; i < len; i++)
 118     max_operand_1 (XVECEXP (insn, arg, i));
 119
 120   return max_opno + 1;
 121 }
 122 \f
 123 static void
 124 print_code (RTX_CODE code)
 125 {
 126   const char *p1;
 127   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 128     putchar (TOUPPER(*p1));
 129 }
 130
 131 static void
 132 gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
 133 {
 134   if (subroutine_type == DEFINE_PEEPHOLE2)
 135     {
 136       printf ("operand%d", XINT (x, 0));
 137     }
 138   else
 139     {
 140       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 141     }
 142 }
 143
 144 /* Print a C expression to construct an RTX just like X,
 145    substituting any operand references appearing within.  */
 146
 147 static void
 148 gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
 149 {
 150   RTX_CODE code;
 151   int i;
 152   int len;
 153   const char *fmt;
 154
 155   if (x == 0)
 156     {
 157       printf ("NULL_RTX");
 158       return;
 159     }
 160
 161   code = GET_CODE (x);
 162
 163   switch (code)
 164     {
 165     case MATCH_OPERAND:
 166     case MATCH_DUP:
 167       if (used)
 168         {
 169           if (used[XINT (x, 0)])
 170             {
 171               printf ("copy_rtx (operand%d)", XINT (x, 0));
 172               return;
 173             }
 174           used[XINT (x, 0)] = 1;
 175         }
 176       printf ("operand%d", XINT (x, 0));
 177       return;
 178
 179     case MATCH_OP_DUP:
 180       printf ("gen_rtx_fmt_");
 181       for (i = 0; i < XVECLEN (x, 1); i++)
 182         printf ("e");
 183       printf (" (GET_CODE (operand%d), ", XINT (x, 0));
 184       if (GET_MODE (x) == VOIDmode)
 185         printf ("GET_MODE (operand%d)", XINT (x, 0));
 186       else
 187         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 188       for (i = 0; i < XVECLEN (x, 1); i++)
 189         {
 190           printf (",\n\t\t");
 191           gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
 192         }
 193       printf (")");
 194       return;
 195
 196     case MATCH_OPERATOR:
 197       printf ("gen_rtx_fmt_");
 198       for (i = 0; i < XVECLEN (x, 2); i++)
 199         printf ("e");
 200       printf (" (GET_CODE (operand%d)", XINT (x, 0));
 201       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 202       for (i = 0; i < XVECLEN (x, 2); i++)
 203         {
 204           printf (",\n\t\t");
 205           gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
 206         }
 207       printf (")");
 208       return;
 209
 210     case MATCH_PARALLEL:
 211     case MATCH_PAR_DUP:
 212       printf ("operand%d", XINT (x, 0));
 213       return;
 214
 215     case MATCH_SCRATCH:
 216       gen_rtx_scratch (x, subroutine_type);
 217       return;
 218
 219     case ADDRESS:
 220       fatal ("ADDRESS expression code used in named instruction pattern");
 221
 222     case PC:
 223       printf ("pc_rtx");
 224       return;
 225     case CLOBBER:
 226       if (REG_P (XEXP (x, 0)))
 227         {
 228           printf ("gen_hard_reg_clobber (%smode, %i)", GET_MODE_NAME (GET_MODE (XEXP (x, 0))),
 229                                                      REGNO (XEXP (x, 0)));
 230           return;
 231         }
 232       break;
 233
 234     case CC0:
 235       printf ("cc0_rtx");
 236       return;
 237
 238     case CONST_INT:
 239       if (INTVAL (x) == 0)
 240         printf ("const0_rtx");
 241       else if (INTVAL (x) == 1)
 242         printf ("const1_rtx");
 243       else if (INTVAL (x) == -1)
 244         printf ("constm1_rtx");
 245       else if (-MAX_SAVED_CONST_INT <= INTVAL (x)
 246           && INTVAL (x) <= MAX_SAVED_CONST_INT)
 247         printf ("const_int_rtx[MAX_SAVED_CONST_INT + (%d)]",
 248                 (int) INTVAL (x));
 249       else if (INTVAL (x) == STORE_FLAG_VALUE)
 250         printf ("const_true_rtx");
 251       else
 252         {
 253           printf ("GEN_INT (");
 254           printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
 255           printf (")");
 256         }
 257       return;
 258
 259     case CONST_DOUBLE:
 260       /* These shouldn't be written in MD files.  Instead, the appropriate
 261          routines in varasm.c should be called.  */
 262       gcc_unreachable ();
 263
 264     default:
 265       break;
 266     }
 267
 268   printf ("gen_rtx_");
 269   print_code (code);
 270   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 271
 272   fmt = GET_RTX_FORMAT (code);
 273   len = GET_RTX_LENGTH (code);
 274   for (i = 0; i < len; i++)
 275     {
 276       if (fmt[i] == '0')
 277         break;
 278       printf (",\n\t");
 279       switch (fmt[i])
 280         {
 281         case 'e': case 'u':
 282           gen_exp (XEXP (x, i), subroutine_type, used);
 283           break;
 284
 285         case 'i':
 286           printf ("%u", XINT (x, i));
 287           break;
 288
 289         case 's':
 290           printf ("\"%s\"", XSTR (x, i));
 291           break;
 292
 293         case 'E':
 294           {
 295             int j;
 296             printf ("gen_rtvec (%d", XVECLEN (x, i));
 297             for (j = 0; j < XVECLEN (x, i); j++)
 298               {
 299                 printf (",\n\t\t");
 300                 gen_exp (XVECEXP (x, i, j), subroutine_type, used);
 301               }
 302             printf (")");
 303             break;
 304           }
 305
 306         default:
 307           gcc_unreachable ();
 308         }
 309     }
 310   printf (")");
 311 }
 312 \f
 313 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 314
 315 static void
 316 gen_insn (rtx insn, int lineno)
 317 {
 318   int operands;
 319   int i;
 320
 321   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 322      registers or MATCH_SCRATCHes.  If so, store away the information for
 323      later.  */
 324
 325   if (XVEC (insn, 1))
 326     {
 327       int has_hard_reg = 0;
 328
 329       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 330         {
 331           if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
 332             break;
 333
 334           if (REG_P (XEXP (XVECEXP (insn, 1, i), 0)))
 335             has_hard_reg = 1;
 336           else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
 337             break;
 338         }
 339
 340       if (i != XVECLEN (insn, 1) - 1)
 341         {
 342           struct clobber_pat *p;
 343           struct clobber_ent *link = XNEW (struct clobber_ent);
 344           int j;
 345
 346           link->code_number = insn_code_number;
 347
 348           /* See if any previous CLOBBER_LIST entry is the same as this
 349              one.  */
 350
 351           for (p = clobber_list; p; p = p->next)
 352             {
 353               if (p->first_clobber != i + 1
 354                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 355                 continue;
 356
 357               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 358                 {
 359                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 360                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 361
 362                   /* OLD and NEW are the same if both are to be a SCRATCH
 363                      of the same mode,
 364                      or if both are registers of the same mode and number.  */
 365                   if (! (GET_MODE (old) == GET_MODE (new)
 366                          && ((GET_CODE (old) == MATCH_SCRATCH
 367                               && GET_CODE (new) == MATCH_SCRATCH)
 368                              || (REG_P (old) && REG_P (new)
 369                                  && REGNO (old) == REGNO (new)))))
 370                     break;
 371                 }
 372
 373               if (j == XVECLEN (insn, 1))
 374                 break;
 375             }
 376
 377           if (p == 0)
 378             {
 379               p = XNEW (struct clobber_pat);
 380
 381               p->insns = 0;
 382               p->pattern = insn;
 383               p->first_clobber = i + 1;
 384               p->next = clobber_list;
 385               p->has_hard_reg = has_hard_reg;
 386               clobber_list = p;
 387             }
 388
 389           link->next = p->insns;
 390           p->insns = link;
 391         }
 392     }
 393
 394   /* Don't mention instructions whose names are the null string
 395      or begin with '*'.  They are in the machine description just
 396      to be recognized.  */
 397   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 398     return;
 399
 400   printf ("/* %s:%d */\n", read_rtx_filename, lineno);
 401
 402   /* Find out how many operands this function has.  */
 403   operands = max_operand_vec (insn, 1);
 404   if (max_dup_opno >= operands)
 405     fatal ("match_dup operand number has no match_operand");
 406
 407   /* Output the function name and argument declarations.  */
 408   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 409   if (operands)
 410     for (i = 0; i < operands; i++)
 411       if (i)
 412         printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
 413       else
 414         printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
 415   else
 416     printf ("void");
 417   printf (")\n");
 418   printf ("{\n");
 419
 420   /* Output code to construct and return the rtl for the instruction body.  */
 421
 422   if (XVECLEN (insn, 1) == 1)
 423     {
 424       printf ("  return ");
 425       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
 426       printf (";\n}\n\n");
 427     }
 428   else
 429     {
 430       char *used = XCNEWVEC (char, operands);
 431
 432       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 433               XVECLEN (insn, 1));
 434
 435       for (i = 0; i < XVECLEN (insn, 1); i++)
 436         {
 437           printf (",\n\t\t");
 438           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, used);
 439         }
 440       printf ("));\n}\n\n");
 441       XDELETEVEC (used);
 442     }
 443 }
 444 \f
 445 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 446
 447 static void
 448 gen_expand (rtx expand)
 449 {
 450   int operands;
 451   int i;
 452   char *used;
 453
 454   if (strlen (XSTR (expand, 0)) == 0)
 455     fatal ("define_expand lacks a name");
 456   if (XVEC (expand, 1) == 0)
 457     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 458
 459   /* Find out how many operands this function has.  */
 460   operands = max_operand_vec (expand, 1);
 461
 462   /* Output the function name and argument declarations.  */
 463   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 464   if (operands)
 465     for (i = 0; i < operands; i++)
 466       if (i)
 467         printf (",\n\trtx operand%d", i);
 468       else
 469         printf ("rtx operand%d", i);
 470   else
 471     printf ("void");
 472   printf (")\n");
 473   printf ("{\n");
 474
 475   /* If we don't have any C code to write, only one insn is being written,
 476      and no MATCH_DUPs are present, we can just return the desired insn
 477      like we do for a DEFINE_INSN.  This saves memory.  */
 478   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 479       && operands > max_dup_opno
 480       && XVECLEN (expand, 1) == 1)
 481     {
 482       printf ("  return ");
 483       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
 484       printf (";\n}\n\n");
 485       return;
 486     }
 487
 488   /* For each operand referred to only with MATCH_DUPs,
 489      make a local variable.  */
 490   for (i = operands; i <= max_dup_opno; i++)
 491     printf ("  rtx operand%d;\n", i);
 492   for (; i <= max_scratch_opno; i++)
 493     printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);
 494   printf ("  rtx _val = 0;\n");
 495   printf ("  start_sequence ();\n");
 496
 497   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 498      before the actual construction.
 499      This code expects to refer to `operands'
 500      just as the output-code in a DEFINE_INSN does,
 501      but here `operands' is an automatic array.
 502      So copy the operand values there before executing it.  */
 503   if (XSTR (expand, 3) && *XSTR (expand, 3))
 504     {
 505       printf ("  {\n");
 506       if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
 507         printf ("    rtx operands[%d];\n",
 508             MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 509       /* Output code to copy the arguments into `operands'.  */
 510       for (i = 0; i < operands; i++)
 511         printf ("    operands[%d] = operand%d;\n", i, i);
 512
 513       /* Output the special code to be executed before the sequence
 514          is generated.  */
 515       print_rtx_ptr_loc (XSTR (expand, 3));
 516       printf ("%s\n", XSTR (expand, 3));
 517
 518       /* Output code to copy the arguments back out of `operands'
 519          (unless we aren't going to use them at all).  */
 520       if (XVEC (expand, 1) != 0)
 521         {
 522           for (i = 0; i < operands; i++)
 523             printf ("    operand%d = operands[%d];\n", i, i);
 524           for (; i <= max_dup_opno; i++)
 525             printf ("    operand%d = operands[%d];\n", i, i);
 526           for (; i <= max_scratch_opno; i++)
 527             printf ("    operand%d = operands[%d];\n", i, i);
 528         }
 529       printf ("  }\n");
 530     }
 531
 532   /* Output code to construct the rtl for the instruction bodies.
 533      Use emit_insn to add them to the sequence being accumulated.
 534      But don't do this if the user's code has set `no_more' nonzero.  */
 535
 536   used = XCNEWVEC (char,
 537                    MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 538
 539   for (i = 0; i < XVECLEN (expand, 1); i++)
 540     {
 541       rtx next = XVECEXP (expand, 1, i);
 542       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 543           || (GET_CODE (next) == PARALLEL
 544               && ((GET_CODE (XVECEXP (next, 0, 0)) == SET
 545                    && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 546                   || GET_CODE (XVECEXP (next, 0, 0)) == RETURN))
 547           || GET_CODE (next) == RETURN)
 548         printf ("  emit_jump_insn (");
 549       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 550                || GET_CODE (next) == CALL
 551                || (GET_CODE (next) == PARALLEL
 552                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 553                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 554                || (GET_CODE (next) == PARALLEL
 555                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 556         printf ("  emit_call_insn (");
 557       else if (LABEL_P (next))
 558         printf ("  emit_label (");
 559       else if (GET_CODE (next) == MATCH_OPERAND
 560                || GET_CODE (next) == MATCH_DUP
 561                || GET_CODE (next) == MATCH_OPERATOR
 562                || GET_CODE (next) == MATCH_OP_DUP
 563                || GET_CODE (next) == MATCH_PARALLEL
 564                || GET_CODE (next) == MATCH_PAR_DUP
 565                || GET_CODE (next) == PARALLEL)
 566         printf ("  emit (");
 567       else
 568         printf ("  emit_insn (");
 569       gen_exp (next, DEFINE_EXPAND, used);
 570       printf (");\n");
 571       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 572           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 573         printf ("  emit_barrier ();");
 574     }
 575
 576   XDELETEVEC (used);
 577
 578   /* Call `get_insns' to extract the list of all the
 579      insns emitted within this gen_... function.  */
 580
 581   printf ("  _val = get_insns ();\n");
 582   printf ("  end_sequence ();\n");
 583   printf ("  return _val;\n}\n\n");
 584 }
 585
 586 /* Like gen_expand, but generates insns resulting from splitting SPLIT.  */
 587
 588 static void
 589 gen_split (rtx split)
 590 {
 591   int i;
 592   int operands;
 593   const char *const name =
 594     ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
 595   const char *unused;
 596   char *used;
 597
 598   if (XVEC (split, 0) == 0)
 599     fatal ("define_%s (definition %d) lacks a pattern", name,
 600            insn_index_number);
 601   else if (XVEC (split, 2) == 0)
 602     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 603            insn_index_number);
 604
 605   /* Find out how many operands this function has.  */
 606
 607   max_operand_vec (split, 2);
 608   operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
 609   unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
 610   used = XCNEWVEC (char, operands);
 611
 612   /* Output the prototype, function name and argument declarations.  */
 613   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 614     {
 615       printf ("extern rtx gen_%s_%d (rtx, rtx *);\n",
 616               name, insn_code_number);
 617       printf ("rtx\ngen_%s_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 618               name, insn_code_number, unused);
 619     }
 620   else
 621     {
 622       printf ("extern rtx gen_split_%d (rtx, rtx *);\n", insn_code_number);
 623       printf ("rtx\ngen_split_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 624               insn_code_number, unused);
 625     }
 626   printf ("{\n");
 627
 628   /* Declare all local variables.  */
 629   for (i = 0; i < operands; i++)
 630     printf ("  rtx operand%d;\n", i);
 631   printf ("  rtx _val = 0;\n");
 632
 633   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 634     output_peephole2_scratches (split);
 635
 636   printf ("  start_sequence ();\n");
 637
 638   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 639      before the actual construction.  */
 640
 641   if (XSTR (split, 3))
 642     {
 643       print_rtx_ptr_loc (XSTR (split, 3));
 644       printf ("%s\n", XSTR (split, 3));
 645     }
 646
 647   /* Output code to copy the arguments back out of `operands'  */
 648   for (i = 0; i < operands; i++)
 649     printf ("  operand%d = operands[%d];\n", i, i);
 650
 651   /* Output code to construct the rtl for the instruction bodies.
 652      Use emit_insn to add them to the sequence being accumulated.
 653      But don't do this if the user's code has set `no_more' nonzero.  */
 654
 655   for (i = 0; i < XVECLEN (split, 2); i++)
 656     {
 657       rtx next = XVECEXP (split, 2, i);
 658       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 659           || (GET_CODE (next) == PARALLEL
 660               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 661               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 662           || GET_CODE (next) == RETURN)
 663         printf ("  emit_jump_insn (");
 664       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 665                || GET_CODE (next) == CALL
 666                || (GET_CODE (next) == PARALLEL
 667                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 668                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 669                || (GET_CODE (next) == PARALLEL
 670                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 671         printf ("  emit_call_insn (");
 672       else if (LABEL_P (next))
 673         printf ("  emit_label (");
 674       else if (GET_CODE (next) == MATCH_OPERAND
 675                || GET_CODE (next) == MATCH_OPERATOR
 676                || GET_CODE (next) == MATCH_PARALLEL
 677                || GET_CODE (next) == MATCH_OP_DUP
 678                || GET_CODE (next) == MATCH_DUP
 679                || GET_CODE (next) == PARALLEL)
 680         printf ("  emit (");
 681       else
 682         printf ("  emit_insn (");
 683       gen_exp (next, GET_CODE (split), used);
 684       printf (");\n");
 685       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 686           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 687         printf ("  emit_barrier ();");
 688     }
 689
 690   /* Call `get_insns' to make a list of all the
 691      insns emitted within this gen_... function.  */
 692
 693   printf ("  _val = get_insns ();\n");
 694   printf ("  end_sequence ();\n");
 695   printf ("  return _val;\n}\n\n");
 696
 697   free (used);
 698 }
 699 \f
 700 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 701    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 702    the end of the vector.  */
 703
 704 static void
 705 output_add_clobbers (void)
 706 {
 707   struct clobber_pat *clobber;
 708   struct clobber_ent *ent;
 709   int i;
 710
 711   printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
 712   printf ("{\n");
 713   printf ("  switch (insn_code_number)\n");
 714   printf ("    {\n");
 715
 716   for (clobber = clobber_list; clobber; clobber = clobber->next)
 717     {
 718       for (ent = clobber->insns; ent; ent = ent->next)
 719         printf ("    case %d:\n", ent->code_number);
 720
 721       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 722         {
 723           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 724           gen_exp (XVECEXP (clobber->pattern, 1, i),
 725                    GET_CODE (clobber->pattern), NULL);
 726           printf (";\n");
 727         }
 728
 729       printf ("      break;\n\n");
 730     }
 731
 732   printf ("    default:\n");
 733   printf ("      gcc_unreachable ();\n");
 734   printf ("    }\n");
 735   printf ("}\n");
 736 }
 737 \f
 738 /* Write a function, `added_clobbers_hard_reg_p' that is given an insn_code
 739    number that will have clobbers added (as indicated by `recog') and returns
 740    1 if those include a clobber of a hard reg or 0 if all of them just clobber
 741    SCRATCH.  */
 742
 743 static void
 744 output_added_clobbers_hard_reg_p (void)
 745 {
 746   struct clobber_pat *clobber;
 747   struct clobber_ent *ent;
 748   int clobber_p, used;
 749
 750   printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
 751   printf ("{\n");
 752   printf ("  switch (insn_code_number)\n");
 753   printf ("    {\n");
 754
 755   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
 756     {
 757       used = 0;
 758       for (clobber = clobber_list; clobber; clobber = clobber->next)
 759         if (clobber->has_hard_reg == clobber_p)
 760           for (ent = clobber->insns; ent; ent = ent->next)
 761             {
 762               printf ("    case %d:\n", ent->code_number);
 763               used++;
 764             }
 765
 766       if (used)
 767         printf ("      return %d;\n\n", clobber_p);
 768     }
 769
 770   printf ("    default:\n");
 771   printf ("      gcc_unreachable ();\n");
 772   printf ("    }\n");
 773   printf ("}\n");
 774 }
 775 \f
 776 /* Generate code to invoke find_free_register () as needed for the
 777    scratch registers used by the peephole2 pattern in SPLIT.  */
 778
 779 static void
 780 output_peephole2_scratches (rtx split)
 781 {
 782   int i;
 783   int insn_nr = 0;
 784
 785   printf ("  HARD_REG_SET _regs_allocated;\n");
 786   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 787
 788   for (i = 0; i < XVECLEN (split, 0); i++)
 789     {
 790       rtx elt = XVECEXP (split, 0, i);
 791       if (GET_CODE (elt) == MATCH_SCRATCH)
 792         {
 793           int last_insn_nr = insn_nr;
 794           int cur_insn_nr = insn_nr;
 795           int j;
 796           for (j = i + 1; j < XVECLEN (split, 0); j++)
 797             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 798               {
 799                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 800                   last_insn_nr = cur_insn_nr;
 801               }
 802             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 803               cur_insn_nr++;
 804
 805           printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 806     return NULL;\n",
 807                   XINT (elt, 0),
 808                   insn_nr, last_insn_nr,
 809                   XSTR (elt, 1),
 810                   GET_MODE_NAME (GET_MODE (elt)));
 811
 812         }
 813       else if (GET_CODE (elt) != MATCH_DUP)
 814         insn_nr++;
 815     }
 816 }
 817
 818 int
 819 main (int argc, char **argv)
 820 {
 821   rtx desc;
 822
 823   progname = "genemit";
 824
 825   if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
 826     return (FATAL_EXIT_CODE);
 827
 828   /* Assign sequential codes to all entries in the machine description
 829      in parallel with the tables in insn-output.c.  */
 830
 831   insn_code_number = 0;
 832   insn_index_number = 0;
 833
 834   printf ("/* Generated automatically by the program `genemit'\n\
 835 from the machine description file `md'.  */\n\n");
 836
 837   printf ("#include \"config.h\"\n");
 838   printf ("#include \"system.h\"\n");
 839   printf ("#include \"coretypes.h\"\n");
 840   printf ("#include \"tm.h\"\n");
 841   printf ("#include \"rtl.h\"\n");
 842   printf ("#include \"tm_p.h\"\n");
 843   printf ("#include \"function.h\"\n");
 844   printf ("#include \"expr.h\"\n");
 845   printf ("#include \"optabs.h\"\n");
 846   printf ("#include \"real.h\"\n");
 847   printf ("#include \"dfp.h\"\n");
 848   printf ("#include \"flags.h\"\n");
 849   printf ("#include \"output.h\"\n");
 850   printf ("#include \"insn-config.h\"\n");
 851   printf ("#include \"hard-reg-set.h\"\n");
 852   printf ("#include \"recog.h\"\n");
 853   printf ("#include \"resource.h\"\n");
 854   printf ("#include \"reload.h\"\n");
 855   printf ("#include \"toplev.h\"\n");
 856   printf ("#include \"regs.h\"\n");
 857   printf ("#include \"tm-constrs.h\"\n");
 858   printf ("#include \"ggc.h\"\n");
 859   printf ("#include \"basic-block.h\"\n");
 860   printf ("#include \"integrate.h\"\n\n");
 861   printf ("#define FAIL return (end_sequence (), _val)\n");
 862   printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
 863
 864   /* Read the machine description.  */
 865
 866   while (1)
 867     {
 868       int line_no;
 869
 870       desc = read_md_rtx (&line_no, &insn_code_number);
 871       if (desc == NULL)
 872         break;
 873
 874       switch (GET_CODE (desc))
 875         {
 876         case DEFINE_INSN:
 877           gen_insn (desc, line_no);
 878           break;
 879
 880         case DEFINE_EXPAND:
 881           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 882           gen_expand (desc);
 883           break;
 884
 885         case DEFINE_SPLIT:
 886           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 887           gen_split (desc);
 888           break;
 889
 890         case DEFINE_PEEPHOLE2:
 891           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 892           gen_split (desc);
 893           break;
 894
 895         default:
 896           break;
 897         }
 898       ++insn_index_number;
 899     }
 900
 901   /* Write out the routines to add CLOBBERs to a pattern and say whether they
 902      clobber a hard reg.  */
 903   output_add_clobbers ();
 904   output_added_clobbers_hard_reg_p ();
 905
 906   fflush (stdout);
 907   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 908 }