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