gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 88, 91, 94, 95, 97, 98, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #include "hconfig.h"
  23 #include "system.h"
  24 #include "rtl.h"
  25 #include "obstack.h"
  26 #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               PROTO((rtx));
  62 static int max_operand_vec              PROTO((rtx, int));
  63 static void print_code                  PROTO((RTX_CODE));
  64 static void gen_exp                     PROTO((rtx, enum rtx_code));
  65 static void gen_insn                    PROTO((rtx));
  66 static void gen_expand                  PROTO((rtx));
  67 static void gen_split                   PROTO((rtx));
  68 static void output_add_clobbers         PROTO((void));
  69 static void gen_rtx_scratch             PROTO((rtx, enum rtx_code));
  70 static void output_peephole2_scratches  PROTO((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     {
 139       if (ISLOWER(*p1))
 140         putchar (toupper(*p1));
 141       else
 142         putchar (*p1);
 143     }
 144 }
 145
 146 static void
 147 gen_rtx_scratch (x, subroutine_type)
 148      rtx x;
 149      enum rtx_code subroutine_type;
 150 {
 151   if (subroutine_type == DEFINE_PEEPHOLE2)
 152     {
 153       printf ("operand%d", XINT (x, 0));
 154     }
 155   else
 156     {
 157       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 158     }
 159 }
 160
 161 /* Print a C expression to construct an RTX just like X,
 162    substituting any operand references appearing within.  */
 163
 164 static void
 165 gen_exp (x, subroutine_type)
 166      rtx x;
 167      enum rtx_code subroutine_type;
 168 {
 169   register RTX_CODE code;
 170   register int i;
 171   register int len;
 172   register const char *fmt;
 173
 174   if (x == 0)
 175     {
 176       printf ("NULL_RTX");
 177       return;
 178     }
 179
 180   code = GET_CODE (x);
 181
 182   switch (code)
 183     {
 184     case MATCH_OPERAND:
 185     case MATCH_DUP:
 186       printf ("operand%d", XINT (x, 0));
 187       return;
 188
 189     case MATCH_OP_DUP:
 190       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 191       if (GET_MODE (x) == VOIDmode)
 192         printf ("GET_MODE (operand%d)", XINT (x, 0));
 193       else
 194         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 195       for (i = 0; i < XVECLEN (x, 1); i++)
 196         {
 197           printf (",\n\t\t");
 198           gen_exp (XVECEXP (x, 1, i), subroutine_type);
 199         }
 200       printf (")");
 201       return;
 202
 203     case MATCH_OPERATOR:
 204       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 205       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 206       for (i = 0; i < XVECLEN (x, 2); i++)
 207         {
 208           printf (",\n\t\t");
 209           gen_exp (XVECEXP (x, 2, i), subroutine_type);
 210         }
 211       printf (")");
 212       return;
 213
 214     case MATCH_PARALLEL:
 215     case MATCH_PAR_DUP:
 216       printf ("operand%d", XINT (x, 0));
 217       return;
 218
 219     case MATCH_SCRATCH:
 220       gen_rtx_scratch (x, subroutine_type);
 221       return;
 222
 223     case ADDRESS:
 224       fatal ("ADDRESS expression code used in named instruction pattern");
 225
 226     case PC:
 227       printf ("pc_rtx");
 228       return;
 229
 230     case CC0:
 231       printf ("cc0_rtx");
 232       return;
 233
 234     case CONST_INT:
 235       if (INTVAL (x) == 0)
 236         printf ("const0_rtx");
 237       else if (INTVAL (x) == 1)
 238         printf ("const1_rtx");
 239       else if (INTVAL (x) == -1)
 240         printf ("constm1_rtx");
 241       else if (INTVAL (x) == STORE_FLAG_VALUE)
 242         printf ("const_true_rtx");
 243       else
 244         {
 245           printf ("GEN_INT (");
 246           printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
 247           printf (")");
 248         }
 249       return;
 250
 251     case CONST_DOUBLE:
 252       /* These shouldn't be written in MD files.  Instead, the appropriate
 253          routines in varasm.c should be called.  */
 254       abort ();
 255
 256     default:
 257       break;
 258     }
 259
 260   printf ("gen_rtx_");
 261   print_code (code);
 262   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 263
 264   fmt = GET_RTX_FORMAT (code);
 265   len = GET_RTX_LENGTH (code);
 266   for (i = 0; i < len; i++)
 267     {
 268       if (fmt[i] == '0')
 269         break;
 270       printf (",\n\t");
 271       if (fmt[i] == 'e' || fmt[i] == 'u')
 272         gen_exp (XEXP (x, i), subroutine_type);
 273       else if (fmt[i] == 'i')
 274         printf ("%u", XINT (x, i));
 275       else if (fmt[i] == 's')
 276         printf ("\"%s\"", XSTR (x, i));
 277       else if (fmt[i] == 'E')
 278         {
 279           int j;
 280           printf ("gen_rtvec (%d", XVECLEN (x, i));
 281           for (j = 0; j < XVECLEN (x, i); j++)
 282             {
 283               printf (",\n\t\t");
 284               gen_exp (XVECEXP (x, i, j), subroutine_type);
 285             }
 286           printf (")");
 287         }
 288       else
 289         abort ();
 290     }
 291   printf (")");
 292 }
 293 \f
 294 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 295
 296 static void
 297 gen_insn (insn)
 298      rtx insn;
 299 {
 300   int operands;
 301   register int i;
 302
 303   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 304      registers or MATCH_SCRATCHes.  If so, store away the information for
 305      later.  */
 306
 307   if (XVEC (insn, 1))
 308     {
 309       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 310         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 311             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 312                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 313           break;
 314
 315       if (i != XVECLEN (insn, 1) - 1)
 316         {
 317           register struct clobber_pat *p;
 318           register struct clobber_ent *link
 319             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 320           register int j;
 321
 322           link->code_number = insn_code_number;
 323
 324           /* See if any previous CLOBBER_LIST entry is the same as this
 325              one.  */
 326
 327           for (p = clobber_list; p; p = p->next)
 328             {
 329               if (p->first_clobber != i + 1
 330                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 331                 continue;
 332
 333               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 334                 {
 335                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 336                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 337
 338                   /* OLD and NEW are the same if both are to be a SCRATCH
 339                      of the same mode,
 340                      or if both are registers of the same mode and number.  */
 341                   if (! (GET_MODE (old) == GET_MODE (new)
 342                          && ((GET_CODE (old) == MATCH_SCRATCH
 343                               && GET_CODE (new) == MATCH_SCRATCH)
 344                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 345                                  && REGNO (old) == REGNO (new)))))
 346                     break;
 347                 }
 348
 349               if (j == XVECLEN (insn, 1))
 350                 break;
 351             }
 352
 353           if (p == 0)
 354             {
 355               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 356
 357               p->insns = 0;
 358               p->pattern = insn;
 359               p->first_clobber = i + 1;
 360               p->next = clobber_list;
 361               clobber_list = p;
 362             }
 363
 364           link->next = p->insns;
 365           p->insns = link;
 366         }
 367     }
 368
 369   /* Don't mention instructions whose names are the null string
 370      or begin with '*'.  They are in the machine description just
 371      to be recognized.  */
 372   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 373     return;
 374
 375   /* Find out how many operands this function has,
 376      and also whether any of them have register constraints.  */
 377   register_constraints = 0;
 378   operands = max_operand_vec (insn, 1);
 379   if (max_dup_opno >= operands)
 380     fatal ("match_dup operand number has no match_operand");
 381
 382   /* Output the function name and argument declarations.  */
 383   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 384   for (i = 0; i < operands; i++)
 385     printf (i ? ", operand%d" : "operand%d", i);
 386   printf (")\n");
 387   for (i = 0; i < operands; i++)
 388     printf ("     rtx operand%d;\n", i);
 389   printf ("{\n");
 390
 391   /* Output code to construct and return the rtl for the instruction body */
 392
 393   if (XVECLEN (insn, 1) == 1)
 394     {
 395       printf ("  return ");
 396       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN);
 397       printf (";\n}\n\n");
 398     }
 399   else
 400     {
 401       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 402               XVECLEN (insn, 1));
 403
 404       for (i = 0; i < XVECLEN (insn, 1); i++)
 405         {
 406           printf (",\n\t\t");
 407           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN);
 408         }
 409       printf ("));\n}\n\n");
 410     }
 411 }
 412 \f
 413 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 414
 415 static void
 416 gen_expand (expand)
 417      rtx expand;
 418 {
 419   int operands;
 420   register 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      and also whether any of them have register constraints.  */
 429   register_constraints = 0;
 430
 431   operands = max_operand_vec (expand, 1);
 432
 433   /* Output the function name and argument declarations.  */
 434   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 435   for (i = 0; i < operands; i++)
 436     printf (i ? ", operand%d" : "operand%d", i);
 437   printf (")\n");
 438   for (i = 0; i < operands; i++)
 439     printf ("     rtx operand%d;\n", i);
 440   printf ("{\n");
 441
 442   /* If we don't have any C code to write, only one insn is being written,
 443      and no MATCH_DUPs are present, we can just return the desired insn
 444      like we do for a DEFINE_INSN.  This saves memory.  */
 445   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 446       && operands > max_dup_opno
 447       && XVECLEN (expand, 1) == 1)
 448     {
 449       printf ("  return ");
 450       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND);
 451       printf (";\n}\n\n");
 452       return;
 453     }
 454
 455   /* For each operand referred to only with MATCH_DUPs,
 456      make a local variable.  */
 457   for (i = operands; i <= max_dup_opno; i++)
 458     printf ("  rtx operand%d;\n", i);
 459   for (; i <= max_scratch_opno; i++)
 460     printf ("  rtx operand%d;\n", i);
 461   printf ("  rtx _val = 0;\n");
 462   printf ("  start_sequence ();\n");
 463
 464   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 465      before the actual construction.
 466      This code expects to refer to `operands'
 467      just as the output-code in a DEFINE_INSN does,
 468      but here `operands' is an automatic array.
 469      So copy the operand values there before executing it.  */
 470   if (XSTR (expand, 3) && *XSTR (expand, 3))
 471     {
 472       printf ("  {\n");
 473       if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
 474         printf ("    rtx operands[%d];\n",
 475             MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 476       /* Output code to copy the arguments into `operands'.  */
 477       for (i = 0; i < operands; i++)
 478         printf ("    operands[%d] = operand%d;\n", i, i);
 479
 480       /* Output the special code to be executed before the sequence
 481          is generated.  */
 482       printf ("%s\n", XSTR (expand, 3));
 483
 484       /* Output code to copy the arguments back out of `operands'
 485          (unless we aren't going to use them at all).  */
 486       if (XVEC (expand, 1) != 0)
 487         {
 488           for (i = 0; i < operands; i++)
 489             printf ("    operand%d = operands[%d];\n", i, i);
 490           for (; i <= max_dup_opno; i++)
 491             printf ("    operand%d = operands[%d];\n", i, i);
 492           for (; i <= max_scratch_opno; i++)
 493             printf ("    operand%d = operands[%d];\n", i, i);
 494         }
 495       printf ("  }\n");
 496     }
 497
 498   /* Output code to construct the rtl for the instruction bodies.
 499      Use emit_insn to add them to the sequence being accumulated.
 500      But don't do this if the user's code has set `no_more' nonzero.  */
 501
 502   for (i = 0; i < XVECLEN (expand, 1); i++)
 503     {
 504       rtx next = XVECEXP (expand, 1, i);
 505       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 506           || (GET_CODE (next) == PARALLEL
 507               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 508               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 509           || GET_CODE (next) == RETURN)
 510         printf ("  emit_jump_insn (");
 511       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 512                || GET_CODE (next) == CALL
 513                || (GET_CODE (next) == PARALLEL
 514                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 515                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 516                || (GET_CODE (next) == PARALLEL
 517                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 518         printf ("  emit_call_insn (");
 519       else if (GET_CODE (next) == CODE_LABEL)
 520         printf ("  emit_label (");
 521       else if (GET_CODE (next) == MATCH_OPERAND
 522                || GET_CODE (next) == MATCH_DUP
 523                || GET_CODE (next) == MATCH_OPERATOR
 524                || GET_CODE (next) == MATCH_OP_DUP
 525                || GET_CODE (next) == MATCH_PARALLEL
 526                || GET_CODE (next) == MATCH_PAR_DUP
 527                || GET_CODE (next) == PARALLEL)
 528         printf ("  emit (");
 529       else
 530         printf ("  emit_insn (");
 531       gen_exp (next, DEFINE_EXPAND);
 532       printf (");\n");
 533       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 534           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 535         printf ("  emit_barrier ();");
 536     }
 537
 538   /* Call `gen_sequence' to make a SEQUENCE out of all the
 539      insns emitted within this gen_... function.  */
 540
 541   printf ("  _val = gen_sequence ();\n");
 542   printf ("  end_sequence ();\n");
 543   printf ("  return _val;\n}\n\n");
 544 }
 545
 546 /* Like gen_expand, but generates a SEQUENCE.  */
 547
 548 static void
 549 gen_split (split)
 550      rtx split;
 551 {
 552   register int i;
 553   int operands;
 554   char *name = "split";
 555
 556   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 557     name = "peephole2";
 558
 559   if (XVEC (split, 0) == 0)
 560     fatal ("define_%s (definition %d) lacks a pattern", name,
 561            insn_index_number);
 562   else if (XVEC (split, 2) == 0)
 563     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 564            insn_index_number);
 565
 566   /* Find out how many operands this function has.  */
 567
 568   max_operand_vec (split, 2);
 569   operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
 570
 571   /* Output the prototype, function name and argument declarations.  */
 572   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 573     {
 574       printf ("extern rtx gen_%s_%d PROTO ((rtx, rtx *));\n",
 575               name, insn_code_number);
 576       printf ("rtx\ngen_%s_%d (curr_insn, operands)\n\
 577      rtx curr_insn ATTRIBUTE_UNUSED;\n\
 578      rtx *operands;\n",
 579               name, insn_code_number);
 580     }
 581   else
 582     {
 583       printf ("extern rtx gen_split_%d PROTO ((rtx *));\n", insn_code_number);
 584       printf ("rtx\ngen_%s_%d (operands)\n     rtx *operands;\n", name,
 585               insn_code_number);
 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));
 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 `gen_sequence' to make a SEQUENCE out of all the
 649      insns emitted within this gen_... function.  */
 650
 651   printf ("  _val = gen_sequence ();\n");
 652   printf ("  end_sequence ();\n");
 653   printf ("  return _val;\n}\n\n");
 654 }
 655 \f
 656 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 657    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 658    the end of the vector.  */
 659
 660 static void
 661 output_add_clobbers ()
 662 {
 663   struct clobber_pat *clobber;
 664   struct clobber_ent *ent;
 665   int i;
 666
 667   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 668   printf ("     rtx pattern;\n     int insn_code_number;\n");
 669   printf ("{\n");
 670   printf ("  switch (insn_code_number)\n");
 671   printf ("    {\n");
 672
 673   for (clobber = clobber_list; clobber; clobber = clobber->next)
 674     {
 675       for (ent = clobber->insns; ent; ent = ent->next)
 676         printf ("    case %d:\n", ent->code_number);
 677
 678       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 679         {
 680           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 681           gen_exp (XVECEXP (clobber->pattern, 1, i),
 682                    GET_CODE (clobber->pattern));
 683           printf (";\n");
 684         }
 685
 686       printf ("      break;\n\n");
 687     }
 688
 689   printf ("    default:\n");
 690   printf ("      abort ();\n");
 691   printf ("    }\n");
 692   printf ("}\n");
 693 }
 694 \f
 695 /* Generate code to invoke find_free_register () as needed for the
 696    scratch registers used by the peephole2 pattern in SPLIT. */
 697
 698 static void
 699 output_peephole2_scratches (split)
 700      rtx split;
 701 {
 702   int i;
 703   int insn_nr = 0;
 704
 705   printf ("  rtx first_insn ATTRIBUTE_UNUSED;\n");
 706   printf ("  rtx last_insn ATTRIBUTE_UNUSED;\n");
 707   printf ("  HARD_REG_SET _regs_allocated;\n");
 708
 709   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 710
 711   for (i = 0; i < XVECLEN (split, 0); i++)
 712     {
 713       rtx elt = XVECEXP (split, 0, i);
 714       if (GET_CODE (elt) == MATCH_SCRATCH)
 715         {
 716           int last_insn_nr = insn_nr;
 717           int cur_insn_nr = insn_nr;
 718           int j;
 719           for (j = i + 1; j < XVECLEN (split, 0); j++)
 720             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 721               {
 722                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 723                   last_insn_nr = cur_insn_nr;
 724               }
 725             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 726               cur_insn_nr++;
 727           printf ("  first_insn = recog_next_insn (curr_insn, %d);\n", insn_nr);
 728           if (last_insn_nr > insn_nr)
 729             printf ("  last_insn = recog_next_insn (curr_insn, %d);\n",
 730                     last_insn_nr - 1);
 731           else
 732             printf ("  last_insn = 0;\n");
 733           printf ("  if ((operands[%d] = find_free_register (first_insn, last_insn, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 734     return NULL;\n",
 735                   XINT (elt, 0),
 736                   XSTR (elt, 1),
 737                   GET_MODE_NAME (GET_MODE (elt)));
 738
 739         }
 740       else if (GET_CODE (elt) != MATCH_DUP)
 741         insn_nr++;
 742     }
 743 }
 744 \f
 745 PTR
 746 xmalloc (size)
 747   size_t size;
 748 {
 749   register PTR val = (PTR) malloc (size);
 750
 751   if (val == 0)
 752     fatal ("virtual memory exhausted");
 753
 754   return val;
 755 }
 756
 757 PTR
 758 xrealloc (old, size)
 759   PTR old;
 760   size_t size;
 761 {
 762   register PTR ptr;
 763   if (old)
 764     ptr = (PTR) realloc (old, size);
 765   else
 766     ptr = (PTR) malloc (size);
 767   if (!ptr)
 768     fatal ("virtual memory exhausted");
 769   return ptr;
 770 }
 771
 772 int
 773 main (argc, argv)
 774      int argc;
 775      char **argv;
 776 {
 777   rtx desc;
 778   FILE *infile;
 779   register int c;
 780
 781   progname = "genemit";
 782   obstack_init (rtl_obstack);
 783
 784   if (argc <= 1)
 785     fatal ("No input file name.");
 786
 787   infile = fopen (argv[1], "r");
 788   if (infile == 0)
 789     {
 790       perror (argv[1]);
 791       exit (FATAL_EXIT_CODE);
 792     }
 793
 794   /* Assign sequential codes to all entries in the machine description
 795      in parallel with the tables in insn-output.c.  */
 796
 797   insn_code_number = 0;
 798   insn_index_number = 0;
 799
 800   printf ("/* Generated automatically by the program `genemit'\n\
 801 from the machine description file `md'.  */\n\n");
 802
 803   printf ("#include \"config.h\"\n");
 804   printf ("#include \"system.h\"\n");
 805   printf ("#include \"rtl.h\"\n");
 806   printf ("#include \"function.h\"\n");
 807   printf ("#include \"expr.h\"\n");
 808   printf ("#include \"real.h\"\n");
 809   printf ("#include \"flags.h\"\n");
 810   printf ("#include \"output.h\"\n");
 811   printf ("#include \"insn-config.h\"\n");
 812   printf ("#include \"insn-flags.h\"\n");
 813   printf ("#include \"insn-codes.h\"\n");
 814   printf ("#include \"recog.h\"\n");
 815   printf ("#include \"hard-reg-set.h\"\n");
 816   printf ("#include \"resource.h\"\n");
 817   printf ("#include \"reload.h\"\n\n");
 818   printf ("#define FAIL return (end_sequence (), _val)\n");
 819   printf ("#define DONE return (_val = gen_sequence (), end_sequence (), _val)\n");
 820
 821   /* Read the machine description.  */
 822
 823   while (1)
 824     {
 825       c = read_skip_spaces (infile);
 826       if (c == EOF)
 827         break;
 828       ungetc (c, infile);
 829
 830       desc = read_rtx (infile);
 831
 832       if (GET_CODE (desc) == DEFINE_INSN)
 833         {
 834           gen_insn (desc);
 835           ++insn_code_number;
 836         }
 837       if (GET_CODE (desc) == DEFINE_EXPAND)
 838         {
 839           gen_expand (desc);
 840           ++insn_code_number;
 841         }
 842       if (GET_CODE (desc) == DEFINE_SPLIT)
 843         {
 844           gen_split (desc);
 845           ++insn_code_number;
 846         }
 847       if (GET_CODE (desc) == DEFINE_PEEPHOLE2)
 848         {
 849           gen_split (desc);
 850           ++insn_code_number;
 851         }
 852       if (GET_CODE (desc) == DEFINE_PEEPHOLE)
 853         {
 854           ++insn_code_number;
 855         }
 856       ++insn_index_number;
 857     }
 858
 859   /* Write out the routine to add CLOBBERs to a pattern.  */
 860   output_add_clobbers ();
 861
 862   fflush (stdout);
 863   exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 864   /* NOTREACHED */
 865   return 0;
 866 }
 867
 868 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 869 const char *
 870 get_insn_name (code)
 871      int code;
 872 {
 873   return NULL;
 874 }