gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 88, 91, 94, 95, 97-99, 2000 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 #include "errors.h"
  27
  28 static struct obstack obstack;
  29 struct obstack *rtl_obstack = &obstack;
  30
  31 #define obstack_chunk_alloc xmalloc
  32 #define obstack_chunk_free free
  33
  34 static int max_opno;
  35 static int max_dup_opno;
  36 static int max_scratch_opno;
  37 static int register_constraints;
  38 static int insn_code_number;
  39 static int insn_index_number;
  40
  41 /* Data structure for recording the patterns of insns that have CLOBBERs.
  42    We use this to output a function that adds these CLOBBERs to a
  43    previously-allocated PARALLEL expression.  */
  44
  45 struct clobber_pat
  46 {
  47   struct clobber_ent *insns;
  48   rtx pattern;
  49   int first_clobber;
  50   struct clobber_pat *next;
  51 } *clobber_list;
  52
  53 /* Records one insn that uses the clobber list.  */
  54
  55 struct clobber_ent
  56 {
  57   int code_number;              /* Counts only insns.  */
  58   struct clobber_ent *next;
  59 };
  60
  61 static void max_operand_1               PARAMS ((rtx));
  62 static int max_operand_vec              PARAMS ((rtx, int));
  63 static void print_code                  PARAMS ((RTX_CODE));
  64 static void gen_exp                     PARAMS ((rtx, enum rtx_code));
  65 static void gen_insn                    PARAMS ((rtx));
  66 static void gen_expand                  PARAMS ((rtx));
  67 static void gen_split                   PARAMS ((rtx));
  68 static void output_add_clobbers         PARAMS ((void));
  69 static void gen_rtx_scratch             PARAMS ((rtx, enum rtx_code));
  70 static void output_peephole2_scratches  PARAMS ((rtx));
  71
  72 \f
  73 static void
  74 max_operand_1 (x)
  75      rtx x;
  76 {
  77   register RTX_CODE code;
  78   register int i;
  79   register int len;
  80   register const char *fmt;
  81
  82   if (x == 0)
  83     return;
  84
  85   code = GET_CODE (x);
  86
  87   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  88     register_constraints = 1;
  89   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  90     register_constraints = 1;
  91   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  92       || code == MATCH_PARALLEL)
  93     max_opno = MAX (max_opno, XINT (x, 0));
  94   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  95     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  96   if (code == MATCH_SCRATCH)
  97     max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
  98
  99   fmt = GET_RTX_FORMAT (code);
 100   len = GET_RTX_LENGTH (code);
 101   for (i = 0; i < len; i++)
 102     {
 103       if (fmt[i] == 'e' || fmt[i] == 'u')
 104         max_operand_1 (XEXP (x, i));
 105       else if (fmt[i] == 'E')
 106         {
 107           int j;
 108           for (j = 0; j < XVECLEN (x, i); j++)
 109             max_operand_1 (XVECEXP (x, i, j));
 110         }
 111     }
 112 }
 113
 114 static int
 115 max_operand_vec (insn, arg)
 116      rtx insn;
 117      int arg;
 118 {
 119   register int len = XVECLEN (insn, arg);
 120   register int i;
 121
 122   max_opno = -1;
 123   max_dup_opno = -1;
 124   max_scratch_opno = -1;
 125
 126   for (i = 0; i < len; i++)
 127     max_operand_1 (XVECEXP (insn, arg, i));
 128
 129   return max_opno + 1;
 130 }
 131 \f
 132 static void
 133 print_code (code)
 134      RTX_CODE code;
 135 {
 136   register const char *p1;
 137   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 138     putchar (TOUPPER(*p1));
 139 }
 140
 141 static void
 142 gen_rtx_scratch (x, subroutine_type)
 143      rtx x;
 144      enum rtx_code subroutine_type;
 145 {
 146   if (subroutine_type == DEFINE_PEEPHOLE2)
 147     {
 148       printf ("operand%d", XINT (x, 0));
 149     }
 150   else
 151     {
 152       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 153     }
 154 }
 155
 156 /* Print a C expression to construct an RTX just like X,
 157    substituting any operand references appearing within.  */
 158
 159 static void
 160 gen_exp (x, subroutine_type)
 161      rtx x;
 162      enum rtx_code subroutine_type;
 163 {
 164   register RTX_CODE code;
 165   register int i;
 166   register int len;
 167   register const char *fmt;
 168
 169   if (x == 0)
 170     {
 171       printf ("NULL_RTX");
 172       return;
 173     }
 174
 175   code = GET_CODE (x);
 176
 177   switch (code)
 178     {
 179     case MATCH_OPERAND:
 180     case MATCH_DUP:
 181       printf ("operand%d", XINT (x, 0));
 182       return;
 183
 184     case MATCH_OP_DUP:
 185       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 186       if (GET_MODE (x) == VOIDmode)
 187         printf ("GET_MODE (operand%d)", XINT (x, 0));
 188       else
 189         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 190       for (i = 0; i < XVECLEN (x, 1); i++)
 191         {
 192           printf (",\n\t\t");
 193           gen_exp (XVECEXP (x, 1, i), subroutine_type);
 194         }
 195       printf (")");
 196       return;
 197
 198     case MATCH_OPERATOR:
 199       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 200       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 201       for (i = 0; i < XVECLEN (x, 2); i++)
 202         {
 203           printf (",\n\t\t");
 204           gen_exp (XVECEXP (x, 2, i), subroutine_type);
 205         }
 206       printf (")");
 207       return;
 208
 209     case MATCH_PARALLEL:
 210     case MATCH_PAR_DUP:
 211       printf ("operand%d", XINT (x, 0));
 212       return;
 213
 214     case MATCH_SCRATCH:
 215       gen_rtx_scratch (x, subroutine_type);
 216       return;
 217
 218     case ADDRESS:
 219       fatal ("ADDRESS expression code used in named instruction pattern");
 220
 221     case PC:
 222       printf ("pc_rtx");
 223       return;
 224
 225     case CC0:
 226       printf ("cc0_rtx");
 227       return;
 228
 229     case CONST_INT:
 230       if (INTVAL (x) == 0)
 231         printf ("const0_rtx");
 232       else if (INTVAL (x) == 1)
 233         printf ("const1_rtx");
 234       else if (INTVAL (x) == -1)
 235         printf ("constm1_rtx");
 236       else if (INTVAL (x) == STORE_FLAG_VALUE)
 237         printf ("const_true_rtx");
 238       else
 239         {
 240           printf ("GEN_INT (");
 241           printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
 242           printf (")");
 243         }
 244       return;
 245
 246     case CONST_DOUBLE:
 247       /* These shouldn't be written in MD files.  Instead, the appropriate
 248          routines in varasm.c should be called.  */
 249       abort ();
 250
 251     default:
 252       break;
 253     }
 254
 255   printf ("gen_rtx_");
 256   print_code (code);
 257   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 258
 259   fmt = GET_RTX_FORMAT (code);
 260   len = GET_RTX_LENGTH (code);
 261   for (i = 0; i < len; i++)
 262     {
 263       if (fmt[i] == '0')
 264         break;
 265       printf (",\n\t");
 266       if (fmt[i] == 'e' || fmt[i] == 'u')
 267         gen_exp (XEXP (x, i), subroutine_type);
 268       else if (fmt[i] == 'i')
 269         printf ("%u", XINT (x, i));
 270       else if (fmt[i] == 's')
 271         printf ("\"%s\"", XSTR (x, i));
 272       else if (fmt[i] == 'E')
 273         {
 274           int j;
 275           printf ("gen_rtvec (%d", XVECLEN (x, i));
 276           for (j = 0; j < XVECLEN (x, i); j++)
 277             {
 278               printf (",\n\t\t");
 279               gen_exp (XVECEXP (x, i, j), subroutine_type);
 280             }
 281           printf (")");
 282         }
 283       else
 284         abort ();
 285     }
 286   printf (")");
 287 }
 288 \f
 289 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 290
 291 static void
 292 gen_insn (insn)
 293      rtx insn;
 294 {
 295   int operands;
 296   register int i;
 297
 298   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 299      registers or MATCH_SCRATCHes.  If so, store away the information for
 300      later.  */
 301
 302   if (XVEC (insn, 1))
 303     {
 304       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 305         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 306             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 307                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 308           break;
 309
 310       if (i != XVECLEN (insn, 1) - 1)
 311         {
 312           register struct clobber_pat *p;
 313           register struct clobber_ent *link
 314             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 315           register int j;
 316
 317           link->code_number = insn_code_number;
 318
 319           /* See if any previous CLOBBER_LIST entry is the same as this
 320              one.  */
 321
 322           for (p = clobber_list; p; p = p->next)
 323             {
 324               if (p->first_clobber != i + 1
 325                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 326                 continue;
 327
 328               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 329                 {
 330                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 331                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 332
 333                   /* OLD and NEW are the same if both are to be a SCRATCH
 334                      of the same mode,
 335                      or if both are registers of the same mode and number.  */
 336                   if (! (GET_MODE (old) == GET_MODE (new)
 337                          && ((GET_CODE (old) == MATCH_SCRATCH
 338                               && GET_CODE (new) == MATCH_SCRATCH)
 339                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 340                                  && REGNO (old) == REGNO (new)))))
 341                     break;
 342                 }
 343
 344               if (j == XVECLEN (insn, 1))
 345                 break;
 346             }
 347
 348           if (p == 0)
 349             {
 350               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 351
 352               p->insns = 0;
 353               p->pattern = insn;
 354               p->first_clobber = i + 1;
 355               p->next = clobber_list;
 356               clobber_list = p;
 357             }
 358
 359           link->next = p->insns;
 360           p->insns = link;
 361         }
 362     }
 363
 364   /* Don't mention instructions whose names are the null string
 365      or begin with '*'.  They are in the machine description just
 366      to be recognized.  */
 367   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 368     return;
 369
 370   /* Find out how many operands this function has,
 371      and also whether any of them have register constraints.  */
 372   register_constraints = 0;
 373   operands = max_operand_vec (insn, 1);
 374   if (max_dup_opno >= operands)
 375     fatal ("match_dup operand number has no match_operand");
 376
 377   /* Output the function name and argument declarations.  */
 378   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 379   for (i = 0; i < operands; i++)
 380     if (i)
 381       printf (", operand%d", i);
 382     else
 383       printf ("operand%d", i);
 384   printf (")\n");
 385   for (i = 0; i < operands; i++)
 386     printf ("     rtx operand%d;\n", i);
 387   printf ("{\n");
 388
 389   /* Output code to construct and return the rtl for the instruction body */
 390
 391   if (XVECLEN (insn, 1) == 1)
 392     {
 393       printf ("  return ");
 394       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN);
 395       printf (";\n}\n\n");
 396     }
 397   else
 398     {
 399       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 400               XVECLEN (insn, 1));
 401
 402       for (i = 0; i < XVECLEN (insn, 1); i++)
 403         {
 404           printf (",\n\t\t");
 405           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN);
 406         }
 407       printf ("));\n}\n\n");
 408     }
 409 }
 410 \f
 411 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 412
 413 static void
 414 gen_expand (expand)
 415      rtx expand;
 416 {
 417   int operands;
 418   register int i;
 419
 420   if (strlen (XSTR (expand, 0)) == 0)
 421     fatal ("define_expand lacks a name");
 422   if (XVEC (expand, 1) == 0)
 423     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 424
 425   /* Find out how many operands this function has,
 426      and also whether any of them have register constraints.  */
 427   register_constraints = 0;
 428
 429   operands = max_operand_vec (expand, 1);
 430
 431   /* Output the function name and argument declarations.  */
 432   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 433   for (i = 0; i < operands; i++)
 434     if (i)
 435       printf (", operand%d", i);
 436     else
 437       printf ("operand%d", i);
 438   printf (")\n");
 439   for (i = 0; i < operands; i++)
 440     printf ("     rtx operand%d;\n", i);
 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);
 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;\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 (next) == RETURN)
 511         printf ("  emit_jump_insn (");
 512       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 513                || GET_CODE (next) == CALL
 514                || (GET_CODE (next) == PARALLEL
 515                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 516                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 517                || (GET_CODE (next) == PARALLEL
 518                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 519         printf ("  emit_call_insn (");
 520       else if (GET_CODE (next) == CODE_LABEL)
 521         printf ("  emit_label (");
 522       else if (GET_CODE (next) == MATCH_OPERAND
 523                || GET_CODE (next) == MATCH_DUP
 524                || GET_CODE (next) == MATCH_OPERATOR
 525                || GET_CODE (next) == MATCH_OP_DUP
 526                || GET_CODE (next) == MATCH_PARALLEL
 527                || GET_CODE (next) == MATCH_PAR_DUP
 528                || GET_CODE (next) == PARALLEL)
 529         printf ("  emit (");
 530       else
 531         printf ("  emit_insn (");
 532       gen_exp (next, DEFINE_EXPAND);
 533       printf (");\n");
 534       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 535           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 536         printf ("  emit_barrier ();");
 537     }
 538
 539   /* Call `gen_sequence' to make a SEQUENCE out of all the
 540      insns emitted within this gen_... function.  */
 541
 542   printf ("  _val = gen_sequence ();\n");
 543   printf ("  end_sequence ();\n");
 544   printf ("  return _val;\n}\n\n");
 545 }
 546
 547 /* Like gen_expand, but generates a SEQUENCE.  */
 548
 549 static void
 550 gen_split (split)
 551      rtx split;
 552 {
 553   register int i;
 554   int operands;
 555   const char *name = "split";
 556
 557   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 558     name = "peephole2";
 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
 572   /* Output the prototype, function name and argument declarations.  */
 573   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 574     {
 575       printf ("extern rtx gen_%s_%d PARAMS ((rtx, rtx *));\n",
 576               name, insn_code_number);
 577       printf ("rtx\ngen_%s_%d (curr_insn, operands)\n\
 578      rtx curr_insn ATTRIBUTE_UNUSED;\n\
 579      rtx *operands;\n",
 580               name, insn_code_number);
 581     }
 582   else
 583     {
 584       printf ("extern rtx gen_split_%d PARAMS ((rtx *));\n", insn_code_number);
 585       printf ("rtx\ngen_%s_%d (operands)\n     rtx *operands;\n", name,
 586               insn_code_number);
 587     }
 588   printf ("{\n");
 589
 590   /* Declare all local variables.  */
 591   for (i = 0; i < operands; i++)
 592     printf ("  rtx operand%d;\n", i);
 593   printf ("  rtx _val = 0;\n");
 594
 595   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 596     output_peephole2_scratches (split);
 597
 598   printf ("  start_sequence ();\n");
 599
 600   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 601      before the actual construction.  */
 602
 603   if (XSTR (split, 3))
 604     printf ("%s\n", XSTR (split, 3));
 605
 606   /* Output code to copy the arguments back out of `operands'  */
 607   for (i = 0; i < operands; i++)
 608     printf ("  operand%d = operands[%d];\n", i, i);
 609
 610   /* Output code to construct the rtl for the instruction bodies.
 611      Use emit_insn to add them to the sequence being accumulated.
 612      But don't do this if the user's code has set `no_more' nonzero.  */
 613
 614   for (i = 0; i < XVECLEN (split, 2); i++)
 615     {
 616       rtx next = XVECEXP (split, 2, i);
 617       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 618           || (GET_CODE (next) == PARALLEL
 619               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 620               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 621           || GET_CODE (next) == RETURN)
 622         printf ("  emit_jump_insn (");
 623       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 624                || GET_CODE (next) == CALL
 625                || (GET_CODE (next) == PARALLEL
 626                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 627                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 628                || (GET_CODE (next) == PARALLEL
 629                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 630         printf ("  emit_call_insn (");
 631       else if (GET_CODE (next) == CODE_LABEL)
 632         printf ("  emit_label (");
 633       else if (GET_CODE (next) == MATCH_OPERAND
 634                || GET_CODE (next) == MATCH_OPERATOR
 635                || GET_CODE (next) == MATCH_PARALLEL
 636                || GET_CODE (next) == MATCH_OP_DUP
 637                || GET_CODE (next) == MATCH_DUP
 638                || GET_CODE (next) == PARALLEL)
 639         printf ("  emit (");
 640       else
 641         printf ("  emit_insn (");
 642       gen_exp (next, GET_CODE (split));
 643       printf (");\n");
 644       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 645           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 646         printf ("  emit_barrier ();");
 647     }
 648
 649   /* Call `gen_sequence' to make a SEQUENCE out of all the
 650      insns emitted within this gen_... function.  */
 651
 652   printf ("  _val = gen_sequence ();\n");
 653   printf ("  end_sequence ();\n");
 654   printf ("  return _val;\n}\n\n");
 655 }
 656 \f
 657 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 658    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 659    the end of the vector.  */
 660
 661 static void
 662 output_add_clobbers ()
 663 {
 664   struct clobber_pat *clobber;
 665   struct clobber_ent *ent;
 666   int i;
 667
 668   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 669   printf ("     rtx pattern;\n     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));
 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 /* Generate code to invoke find_free_register () as needed for the
 697    scratch registers used by the peephole2 pattern in SPLIT. */
 698
 699 static void
 700 output_peephole2_scratches (split)
 701      rtx split;
 702 {
 703   int i;
 704   int insn_nr = 0;
 705
 706   printf ("  rtx first_insn ATTRIBUTE_UNUSED;\n");
 707   printf ("  rtx last_insn ATTRIBUTE_UNUSED;\n");
 708   printf ("  HARD_REG_SET _regs_allocated;\n");
 709
 710   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 711
 712   for (i = 0; i < XVECLEN (split, 0); i++)
 713     {
 714       rtx elt = XVECEXP (split, 0, i);
 715       if (GET_CODE (elt) == MATCH_SCRATCH)
 716         {
 717           int last_insn_nr = insn_nr;
 718           int cur_insn_nr = insn_nr;
 719           int j;
 720           for (j = i + 1; j < XVECLEN (split, 0); j++)
 721             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 722               {
 723                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 724                   last_insn_nr = cur_insn_nr;
 725               }
 726             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 727               cur_insn_nr++;
 728           printf ("  first_insn = recog_next_insn (curr_insn, %d);\n", insn_nr);
 729           if (last_insn_nr > insn_nr)
 730             printf ("  last_insn = recog_next_insn (curr_insn, %d);\n",
 731                     last_insn_nr - 1);
 732           else
 733             printf ("  last_insn = 0;\n");
 734           printf ("  if ((operands[%d] = find_free_register (first_insn, last_insn, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 735     return NULL;\n",
 736                   XINT (elt, 0),
 737                   XSTR (elt, 1),
 738                   GET_MODE_NAME (GET_MODE (elt)));
 739
 740         }
 741       else if (GET_CODE (elt) != MATCH_DUP)
 742         insn_nr++;
 743     }
 744 }
 745 \f
 746 PTR
 747 xmalloc (size)
 748   size_t size;
 749 {
 750   register PTR val = (PTR) malloc (size);
 751
 752   if (val == 0)
 753     fatal ("virtual memory exhausted");
 754
 755   return val;
 756 }
 757
 758 PTR
 759 xrealloc (old, size)
 760   PTR old;
 761   size_t size;
 762 {
 763   register PTR ptr;
 764   if (old)
 765     ptr = (PTR) realloc (old, size);
 766   else
 767     ptr = (PTR) malloc (size);
 768   if (!ptr)
 769     fatal ("virtual memory exhausted");
 770   return ptr;
 771 }
 772
 773 extern int main PARAMS ((int, char **));
 774
 775 int
 776 main (argc, argv)
 777      int argc;
 778      char **argv;
 779 {
 780   rtx desc;
 781   FILE *infile;
 782   register int c;
 783
 784   progname = "genemit";
 785   obstack_init (rtl_obstack);
 786
 787   if (argc <= 1)
 788     fatal ("No input file name.");
 789
 790   infile = fopen (argv[1], "r");
 791   if (infile == 0)
 792     {
 793       perror (argv[1]);
 794       return (FATAL_EXIT_CODE);
 795     }
 796   read_rtx_filename = argv[1];
 797
 798   /* Assign sequential codes to all entries in the machine description
 799      in parallel with the tables in insn-output.c.  */
 800
 801   insn_code_number = 0;
 802   insn_index_number = 0;
 803
 804   printf ("/* Generated automatically by the program `genemit'\n\
 805 from the machine description file `md'.  */\n\n");
 806
 807   printf ("#include \"config.h\"\n");
 808   printf ("#include \"system.h\"\n");
 809   printf ("#include \"rtl.h\"\n");
 810   printf ("#include \"tm_p.h\"\n");
 811   printf ("#include \"function.h\"\n");
 812   printf ("#include \"expr.h\"\n");
 813   printf ("#include \"real.h\"\n");
 814   printf ("#include \"flags.h\"\n");
 815   printf ("#include \"output.h\"\n");
 816   printf ("#include \"insn-config.h\"\n");
 817   printf ("#include \"insn-flags.h\"\n");
 818   printf ("#include \"insn-codes.h\"\n");
 819   printf ("#include \"recog.h\"\n");
 820   printf ("#include \"hard-reg-set.h\"\n");
 821   printf ("#include \"resource.h\"\n");
 822   printf ("#include \"reload.h\"\n\n");
 823   printf ("#define FAIL return (end_sequence (), _val)\n");
 824   printf ("#define DONE return (_val = gen_sequence (), end_sequence (), _val)\n");
 825
 826   /* Read the machine description.  */
 827
 828   while (1)
 829     {
 830       c = read_skip_spaces (infile);
 831       if (c == EOF)
 832         break;
 833       ungetc (c, infile);
 834
 835       desc = read_rtx (infile);
 836
 837       if (GET_CODE (desc) == DEFINE_INSN)
 838         {
 839           gen_insn (desc);
 840           ++insn_code_number;
 841         }
 842       if (GET_CODE (desc) == DEFINE_EXPAND)
 843         {
 844           gen_expand (desc);
 845           ++insn_code_number;
 846         }
 847       if (GET_CODE (desc) == DEFINE_SPLIT)
 848         {
 849           gen_split (desc);
 850           ++insn_code_number;
 851         }
 852       if (GET_CODE (desc) == DEFINE_PEEPHOLE2)
 853         {
 854           gen_split (desc);
 855           ++insn_code_number;
 856         }
 857       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
 858         {
 859           ++insn_code_number;
 860         }
 861       ++insn_index_number;
 862     }
 863
 864   /* Write out the routine to add CLOBBERs to a pattern.  */
 865   output_add_clobbers ();
 866
 867   fflush (stdout);
 868   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 869 }
 870
 871 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 872 const char *
 873 get_insn_name (code)
 874      int code ATTRIBUTE_UNUSED;
 875 {
 876   return NULL;
 877 }