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
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 #include "hconfig.h"
  24 #include "system.h"
  25 #include "rtl.h"
  26 #include "obstack.h"
  27 #include "errors.h"
  28 #include "gensupport.h"
  29
  30 static struct obstack obstack;
  31 struct obstack *rtl_obstack = &obstack;
  32
  33 #define obstack_chunk_alloc xmalloc
  34 #define obstack_chunk_free free
  35
  36 static int max_opno;
  37 static int max_dup_opno;
  38 static int max_scratch_opno;
  39 static int register_constraints;
  40 static int insn_code_number;
  41 static int insn_index_number;
  42
  43 /* Data structure for recording the patterns of insns that have CLOBBERs.
  44    We use this to output a function that adds these CLOBBERs to a
  45    previously-allocated PARALLEL expression.  */
  46
  47 struct clobber_pat
  48 {
  49   struct clobber_ent *insns;
  50   rtx pattern;
  51   int first_clobber;
  52   struct clobber_pat *next;
  53 } *clobber_list;
  54
  55 /* Records one insn that uses the clobber list.  */
  56
  57 struct clobber_ent
  58 {
  59   int code_number;              /* Counts only insns.  */
  60   struct clobber_ent *next;
  61 };
  62
  63 static void max_operand_1               PARAMS ((rtx));
  64 static int max_operand_vec              PARAMS ((rtx, int));
  65 static void print_code                  PARAMS ((RTX_CODE));
  66 static void gen_exp                     PARAMS ((rtx, enum rtx_code));
  67 static void gen_insn                    PARAMS ((rtx));
  68 static void gen_expand                  PARAMS ((rtx));
  69 static void gen_split                   PARAMS ((rtx));
  70 static void output_add_clobbers         PARAMS ((void));
  71 static void gen_rtx_scratch             PARAMS ((rtx, enum rtx_code));
  72 static void output_peephole2_scratches  PARAMS ((rtx));
  73
  74 \f
  75 static void
  76 max_operand_1 (x)
  77      rtx x;
  78 {
  79   register RTX_CODE code;
  80   register int i;
  81   register int len;
  82   register const char *fmt;
  83
  84   if (x == 0)
  85     return;
  86
  87   code = GET_CODE (x);
  88
  89   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  90     register_constraints = 1;
  91   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  92     register_constraints = 1;
  93   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  94       || code == MATCH_PARALLEL)
  95     max_opno = MAX (max_opno, XINT (x, 0));
  96   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  97     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  98   if (code == MATCH_SCRATCH)
  99     max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
 100
 101   fmt = GET_RTX_FORMAT (code);
 102   len = GET_RTX_LENGTH (code);
 103   for (i = 0; i < len; i++)
 104     {
 105       if (fmt[i] == 'e' || fmt[i] == 'u')
 106         max_operand_1 (XEXP (x, i));
 107       else if (fmt[i] == 'E')
 108         {
 109           int j;
 110           for (j = 0; j < XVECLEN (x, i); j++)
 111             max_operand_1 (XVECEXP (x, i, j));
 112         }
 113     }
 114 }
 115
 116 static int
 117 max_operand_vec (insn, arg)
 118      rtx insn;
 119      int arg;
 120 {
 121   register int len = XVECLEN (insn, arg);
 122   register int i;
 123
 124   max_opno = -1;
 125   max_dup_opno = -1;
 126   max_scratch_opno = -1;
 127
 128   for (i = 0; i < len; i++)
 129     max_operand_1 (XVECEXP (insn, arg, i));
 130
 131   return max_opno + 1;
 132 }
 133 \f
 134 static void
 135 print_code (code)
 136      RTX_CODE code;
 137 {
 138   register const char *p1;
 139   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 140     putchar (TOUPPER(*p1));
 141 }
 142
 143 static void
 144 gen_rtx_scratch (x, subroutine_type)
 145      rtx x;
 146      enum rtx_code subroutine_type;
 147 {
 148   if (subroutine_type == DEFINE_PEEPHOLE2)
 149     {
 150       printf ("operand%d", XINT (x, 0));
 151     }
 152   else
 153     {
 154       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 155     }
 156 }
 157
 158 /* Print a C expression to construct an RTX just like X,
 159    substituting any operand references appearing within.  */
 160
 161 static void
 162 gen_exp (x, subroutine_type)
 163      rtx x;
 164      enum rtx_code subroutine_type;
 165 {
 166   register RTX_CODE code;
 167   register int i;
 168   register int len;
 169   register const char *fmt;
 170
 171   if (x == 0)
 172     {
 173       printf ("NULL_RTX");
 174       return;
 175     }
 176
 177   code = GET_CODE (x);
 178
 179   switch (code)
 180     {
 181     case MATCH_OPERAND:
 182     case MATCH_DUP:
 183       printf ("operand%d", XINT (x, 0));
 184       return;
 185
 186     case MATCH_OP_DUP:
 187       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 188       if (GET_MODE (x) == VOIDmode)
 189         printf ("GET_MODE (operand%d)", XINT (x, 0));
 190       else
 191         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 192       for (i = 0; i < XVECLEN (x, 1); i++)
 193         {
 194           printf (",\n\t\t");
 195           gen_exp (XVECEXP (x, 1, i), subroutine_type);
 196         }
 197       printf (")");
 198       return;
 199
 200     case MATCH_OPERATOR:
 201       printf ("gen_rtx (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);
 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
 227     case CC0:
 228       printf ("cc0_rtx");
 229       return;
 230
 231     case CONST_INT:
 232       if (INTVAL (x) == 0)
 233         printf ("const0_rtx");
 234       else if (INTVAL (x) == 1)
 235         printf ("const1_rtx");
 236       else if (INTVAL (x) == -1)
 237         printf ("constm1_rtx");
 238       else if (INTVAL (x) == STORE_FLAG_VALUE)
 239         printf ("const_true_rtx");
 240       else
 241         {
 242           printf ("GEN_INT (");
 243           printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
 244           printf (")");
 245         }
 246       return;
 247
 248     case CONST_DOUBLE:
 249       /* These shouldn't be written in MD files.  Instead, the appropriate
 250          routines in varasm.c should be called.  */
 251       abort ();
 252
 253     default:
 254       break;
 255     }
 256
 257   printf ("gen_rtx_");
 258   print_code (code);
 259   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 260
 261   fmt = GET_RTX_FORMAT (code);
 262   len = GET_RTX_LENGTH (code);
 263   for (i = 0; i < len; i++)
 264     {
 265       if (fmt[i] == '0')
 266         break;
 267       printf (",\n\t");
 268       if (fmt[i] == 'e' || fmt[i] == 'u')
 269         gen_exp (XEXP (x, i), subroutine_type);
 270       else if (fmt[i] == 'i')
 271         printf ("%u", XINT (x, i));
 272       else if (fmt[i] == 's')
 273         printf ("\"%s\"", XSTR (x, i));
 274       else if (fmt[i] == 'E')
 275         {
 276           int j;
 277           printf ("gen_rtvec (%d", XVECLEN (x, i));
 278           for (j = 0; j < XVECLEN (x, i); j++)
 279             {
 280               printf (",\n\t\t");
 281               gen_exp (XVECEXP (x, i, j), subroutine_type);
 282             }
 283           printf (")");
 284         }
 285       else
 286         abort ();
 287     }
 288   printf (")");
 289 }
 290 \f
 291 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 292
 293 static void
 294 gen_insn (insn)
 295      rtx insn;
 296 {
 297   int operands;
 298   register int i;
 299
 300   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 301      registers or MATCH_SCRATCHes.  If so, store away the information for
 302      later.  */
 303
 304   if (XVEC (insn, 1))
 305     {
 306       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 307         if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
 308             || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
 309                 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
 310           break;
 311
 312       if (i != XVECLEN (insn, 1) - 1)
 313         {
 314           register struct clobber_pat *p;
 315           register struct clobber_ent *link
 316             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 317           register int j;
 318
 319           link->code_number = insn_code_number;
 320
 321           /* See if any previous CLOBBER_LIST entry is the same as this
 322              one.  */
 323
 324           for (p = clobber_list; p; p = p->next)
 325             {
 326               if (p->first_clobber != i + 1
 327                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 328                 continue;
 329
 330               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 331                 {
 332                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 333                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 334
 335                   /* OLD and NEW are the same if both are to be a SCRATCH
 336                      of the same mode,
 337                      or if both are registers of the same mode and number.  */
 338                   if (! (GET_MODE (old) == GET_MODE (new)
 339                          && ((GET_CODE (old) == MATCH_SCRATCH
 340                               && GET_CODE (new) == MATCH_SCRATCH)
 341                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 342                                  && REGNO (old) == REGNO (new)))))
 343                     break;
 344                 }
 345
 346               if (j == XVECLEN (insn, 1))
 347                 break;
 348             }
 349
 350           if (p == 0)
 351             {
 352               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 353
 354               p->insns = 0;
 355               p->pattern = insn;
 356               p->first_clobber = i + 1;
 357               p->next = clobber_list;
 358               clobber_list = p;
 359             }
 360
 361           link->next = p->insns;
 362           p->insns = link;
 363         }
 364     }
 365
 366   /* Don't mention instructions whose names are the null string
 367      or begin with '*'.  They are in the machine description just
 368      to be recognized.  */
 369   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 370     return;
 371
 372   /* Find out how many operands this function has,
 373      and also whether any of them have register constraints.  */
 374   register_constraints = 0;
 375   operands = max_operand_vec (insn, 1);
 376   if (max_dup_opno >= operands)
 377     fatal ("match_dup operand number has no match_operand");
 378
 379   /* Output the function name and argument declarations.  */
 380   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 381   for (i = 0; i < operands; i++)
 382     if (i)
 383       printf (", operand%d", i);
 384     else
 385       printf ("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     if (i)
 437       printf (", operand%d", i);
 438     else
 439       printf ("operand%d", i);
 440   printf (")\n");
 441   for (i = 0; i < operands; i++)
 442     printf ("     rtx operand%d;\n", i);
 443   printf ("{\n");
 444
 445   /* If we don't have any C code to write, only one insn is being written,
 446      and no MATCH_DUPs are present, we can just return the desired insn
 447      like we do for a DEFINE_INSN.  This saves memory.  */
 448   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 449       && operands > max_dup_opno
 450       && XVECLEN (expand, 1) == 1)
 451     {
 452       printf ("  return ");
 453       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND);
 454       printf (";\n}\n\n");
 455       return;
 456     }
 457
 458   /* For each operand referred to only with MATCH_DUPs,
 459      make a local variable.  */
 460   for (i = operands; i <= max_dup_opno; i++)
 461     printf ("  rtx operand%d;\n", i);
 462   for (; i <= max_scratch_opno; i++)
 463     printf ("  rtx operand%d;\n", i);
 464   printf ("  rtx _val = 0;\n");
 465   printf ("  start_sequence ();\n");
 466
 467   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 468      before the actual construction.
 469      This code expects to refer to `operands'
 470      just as the output-code in a DEFINE_INSN does,
 471      but here `operands' is an automatic array.
 472      So copy the operand values there before executing it.  */
 473   if (XSTR (expand, 3) && *XSTR (expand, 3))
 474     {
 475       printf ("  {\n");
 476       if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
 477         printf ("    rtx operands[%d];\n",
 478             MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 479       /* Output code to copy the arguments into `operands'.  */
 480       for (i = 0; i < operands; i++)
 481         printf ("    operands[%d] = operand%d;\n", i, i);
 482
 483       /* Output the special code to be executed before the sequence
 484          is generated.  */
 485       printf ("%s\n", XSTR (expand, 3));
 486
 487       /* Output code to copy the arguments back out of `operands'
 488          (unless we aren't going to use them at all).  */
 489       if (XVEC (expand, 1) != 0)
 490         {
 491           for (i = 0; i < operands; i++)
 492             printf ("    operand%d = operands[%d];\n", i, i);
 493           for (; i <= max_dup_opno; i++)
 494             printf ("    operand%d = operands[%d];\n", i, i);
 495           for (; i <= max_scratch_opno; i++)
 496             printf ("    operand%d = operands[%d];\n", i, i);
 497         }
 498       printf ("  }\n");
 499     }
 500
 501   /* Output code to construct the rtl for the instruction bodies.
 502      Use emit_insn to add them to the sequence being accumulated.
 503      But don't do this if the user's code has set `no_more' nonzero.  */
 504
 505   for (i = 0; i < XVECLEN (expand, 1); i++)
 506     {
 507       rtx next = XVECEXP (expand, 1, i);
 508       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 509           || (GET_CODE (next) == PARALLEL
 510               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 511               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 512           || GET_CODE (next) == RETURN)
 513         printf ("  emit_jump_insn (");
 514       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 515                || GET_CODE (next) == CALL
 516                || (GET_CODE (next) == PARALLEL
 517                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 518                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 519                || (GET_CODE (next) == PARALLEL
 520                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 521         printf ("  emit_call_insn (");
 522       else if (GET_CODE (next) == CODE_LABEL)
 523         printf ("  emit_label (");
 524       else if (GET_CODE (next) == MATCH_OPERAND
 525                || GET_CODE (next) == MATCH_DUP
 526                || GET_CODE (next) == MATCH_OPERATOR
 527                || GET_CODE (next) == MATCH_OP_DUP
 528                || GET_CODE (next) == MATCH_PARALLEL
 529                || GET_CODE (next) == MATCH_PAR_DUP
 530                || GET_CODE (next) == PARALLEL)
 531         printf ("  emit (");
 532       else
 533         printf ("  emit_insn (");
 534       gen_exp (next, DEFINE_EXPAND);
 535       printf (");\n");
 536       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 537           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 538         printf ("  emit_barrier ();");
 539     }
 540
 541   /* Call `gen_sequence' to make a SEQUENCE out of all the
 542      insns emitted within this gen_... function.  */
 543
 544   printf ("  _val = gen_sequence ();\n");
 545   printf ("  end_sequence ();\n");
 546   printf ("  return _val;\n}\n\n");
 547 }
 548
 549 /* Like gen_expand, but generates a SEQUENCE.  */
 550
 551 static void
 552 gen_split (split)
 553      rtx split;
 554 {
 555   register int i;
 556   int operands;
 557   const char *name = "split";
 558
 559   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 560     name = "peephole2";
 561
 562   if (XVEC (split, 0) == 0)
 563     fatal ("define_%s (definition %d) lacks a pattern", name,
 564            insn_index_number);
 565   else if (XVEC (split, 2) == 0)
 566     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 567            insn_index_number);
 568
 569   /* Find out how many operands this function has.  */
 570
 571   max_operand_vec (split, 2);
 572   operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
 573
 574   /* Output the prototype, function name and argument declarations.  */
 575   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 576     {
 577       printf ("extern rtx gen_%s_%d PARAMS ((rtx, rtx *));\n",
 578               name, insn_code_number);
 579       printf ("rtx\ngen_%s_%d (curr_insn, operands)\n\
 580      rtx curr_insn ATTRIBUTE_UNUSED;\n\
 581      rtx *operands;\n",
 582               name, insn_code_number);
 583     }
 584   else
 585     {
 586       printf ("extern rtx gen_split_%d PARAMS ((rtx *));\n", insn_code_number);
 587       printf ("rtx\ngen_%s_%d (operands)\n     rtx *operands;\n", name,
 588               insn_code_number);
 589     }
 590   printf ("{\n");
 591
 592   /* Declare all local variables.  */
 593   for (i = 0; i < operands; i++)
 594     printf ("  rtx operand%d;\n", i);
 595   printf ("  rtx _val = 0;\n");
 596
 597   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 598     output_peephole2_scratches (split);
 599
 600   printf ("  start_sequence ();\n");
 601
 602   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 603      before the actual construction.  */
 604
 605   if (XSTR (split, 3))
 606     printf ("%s\n", XSTR (split, 3));
 607
 608   /* Output code to copy the arguments back out of `operands'  */
 609   for (i = 0; i < operands; i++)
 610     printf ("  operand%d = operands[%d];\n", i, i);
 611
 612   /* Output code to construct the rtl for the instruction bodies.
 613      Use emit_insn to add them to the sequence being accumulated.
 614      But don't do this if the user's code has set `no_more' nonzero.  */
 615
 616   for (i = 0; i < XVECLEN (split, 2); i++)
 617     {
 618       rtx next = XVECEXP (split, 2, i);
 619       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 620           || (GET_CODE (next) == PARALLEL
 621               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 622               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 623           || GET_CODE (next) == RETURN)
 624         printf ("  emit_jump_insn (");
 625       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 626                || GET_CODE (next) == CALL
 627                || (GET_CODE (next) == PARALLEL
 628                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 629                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 630                || (GET_CODE (next) == PARALLEL
 631                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 632         printf ("  emit_call_insn (");
 633       else if (GET_CODE (next) == CODE_LABEL)
 634         printf ("  emit_label (");
 635       else if (GET_CODE (next) == MATCH_OPERAND
 636                || GET_CODE (next) == MATCH_OPERATOR
 637                || GET_CODE (next) == MATCH_PARALLEL
 638                || GET_CODE (next) == MATCH_OP_DUP
 639                || GET_CODE (next) == MATCH_DUP
 640                || GET_CODE (next) == PARALLEL)
 641         printf ("  emit (");
 642       else
 643         printf ("  emit_insn (");
 644       gen_exp (next, GET_CODE (split));
 645       printf (");\n");
 646       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 647           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 648         printf ("  emit_barrier ();");
 649     }
 650
 651   /* Call `gen_sequence' to make a SEQUENCE out of all the
 652      insns emitted within this gen_... function.  */
 653
 654   printf ("  _val = gen_sequence ();\n");
 655   printf ("  end_sequence ();\n");
 656   printf ("  return _val;\n}\n\n");
 657 }
 658 \f
 659 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 660    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 661    the end of the vector.  */
 662
 663 static void
 664 output_add_clobbers ()
 665 {
 666   struct clobber_pat *clobber;
 667   struct clobber_ent *ent;
 668   int i;
 669
 670   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 671   printf ("     rtx pattern;\n     int insn_code_number;\n");
 672   printf ("{\n");
 673   printf ("  switch (insn_code_number)\n");
 674   printf ("    {\n");
 675
 676   for (clobber = clobber_list; clobber; clobber = clobber->next)
 677     {
 678       for (ent = clobber->insns; ent; ent = ent->next)
 679         printf ("    case %d:\n", ent->code_number);
 680
 681       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 682         {
 683           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 684           gen_exp (XVECEXP (clobber->pattern, 1, i),
 685                    GET_CODE (clobber->pattern));
 686           printf (";\n");
 687         }
 688
 689       printf ("      break;\n\n");
 690     }
 691
 692   printf ("    default:\n");
 693   printf ("      abort ();\n");
 694   printf ("    }\n");
 695   printf ("}\n");
 696 }
 697 \f
 698 /* Generate code to invoke find_free_register () as needed for the
 699    scratch registers used by the peephole2 pattern in SPLIT. */
 700
 701 static void
 702 output_peephole2_scratches (split)
 703      rtx split;
 704 {
 705   int i;
 706   int insn_nr = 0;
 707
 708   printf ("  rtx first_insn ATTRIBUTE_UNUSED;\n");
 709   printf ("  rtx last_insn ATTRIBUTE_UNUSED;\n");
 710   printf ("  HARD_REG_SET _regs_allocated;\n");
 711
 712   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 713
 714   for (i = 0; i < XVECLEN (split, 0); i++)
 715     {
 716       rtx elt = XVECEXP (split, 0, i);
 717       if (GET_CODE (elt) == MATCH_SCRATCH)
 718         {
 719           int last_insn_nr = insn_nr;
 720           int cur_insn_nr = insn_nr;
 721           int j;
 722           for (j = i + 1; j < XVECLEN (split, 0); j++)
 723             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 724               {
 725                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 726                   last_insn_nr = cur_insn_nr;
 727               }
 728             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 729               cur_insn_nr++;
 730           printf ("  first_insn = recog_next_insn (curr_insn, %d);\n", insn_nr);
 731           if (last_insn_nr > insn_nr)
 732             printf ("  last_insn = recog_next_insn (curr_insn, %d);\n",
 733                     last_insn_nr - 1);
 734           else
 735             printf ("  last_insn = 0;\n");
 736           printf ("  if ((operands[%d] = find_free_register (first_insn, last_insn, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 737     return NULL;\n",
 738                   XINT (elt, 0),
 739                   XSTR (elt, 1),
 740                   GET_MODE_NAME (GET_MODE (elt)));
 741
 742         }
 743       else if (GET_CODE (elt) != MATCH_DUP)
 744         insn_nr++;
 745     }
 746 }
 747 \f
 748 PTR
 749 xmalloc (size)
 750   size_t size;
 751 {
 752   register PTR val = (PTR) malloc (size);
 753
 754   if (val == 0)
 755     fatal ("virtual memory exhausted");
 756
 757   return val;
 758 }
 759
 760 PTR
 761 xrealloc (old, size)
 762   PTR old;
 763   size_t size;
 764 {
 765   register PTR ptr;
 766   if (old)
 767     ptr = (PTR) realloc (old, size);
 768   else
 769     ptr = (PTR) malloc (size);
 770   if (!ptr)
 771     fatal ("virtual memory exhausted");
 772   return ptr;
 773 }
 774
 775 extern int main PARAMS ((int, char **));
 776
 777 int
 778 main (argc, argv)
 779      int argc;
 780      char **argv;
 781 {
 782   rtx desc;
 783
 784   progname = "genemit";
 785   obstack_init (rtl_obstack);
 786
 787   if (argc <= 1)
 788     fatal ("No input file name.");
 789
 790   if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
 791     return (FATAL_EXIT_CODE);
 792
 793   /* Assign sequential codes to all entries in the machine description
 794      in parallel with the tables in insn-output.c.  */
 795
 796   insn_code_number = 0;
 797   insn_index_number = 0;
 798
 799   printf ("/* Generated automatically by the program `genemit'\n\
 800 from the machine description file `md'.  */\n\n");
 801
 802   printf ("#include \"config.h\"\n");
 803   printf ("#include \"system.h\"\n");
 804   printf ("#include \"rtl.h\"\n");
 805   printf ("#include \"tm_p.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       int line_no;
 826
 827       desc = read_md_rtx (&line_no, &insn_code_number);
 828       if (desc == NULL)
 829         break;
 830
 831       switch (GET_CODE (desc))
 832         {
 833           case DEFINE_INSN:
 834               gen_insn (desc);
 835               break;
 836
 837           case DEFINE_EXPAND:
 838               gen_expand (desc);
 839               break;
 840
 841           case DEFINE_SPLIT:
 842               gen_split (desc);
 843               break;
 844
 845           case DEFINE_PEEPHOLE2:
 846               gen_split (desc);
 847               break;
 848
 849           default:
 850               break;
 851          }
 852       ++insn_index_number;
 853     }
 854
 855   /* Write out the routine to add CLOBBERs to a pattern.  */
 856   output_add_clobbers ();
 857
 858   fflush (stdout);
 859   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 860 }
 861
 862 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 863 const char *
 864 get_insn_name (code)
 865      int code ATTRIBUTE_UNUSED;
 866 {
 867   return NULL;
 868 }