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