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, 2005, 2007, 2008, 2009, 2010 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 3, 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 COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "bconfig.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "rtl.h"
  27 #include "errors.h"
  28 #include "read-md.h"
  29 #include "gensupport.h"
  30
  31
  32 static int insn_code_number;
  33 static int insn_index_number;
  34
  35 /* Data structure for recording the patterns of insns that have CLOBBERs.
  36    We use this to output a function that adds these CLOBBERs to a
  37    previously-allocated PARALLEL expression.  */
  38
  39 struct clobber_pat
  40 {
  41   struct clobber_ent *insns;
  42   rtx pattern;
  43   int first_clobber;
  44   struct clobber_pat *next;
  45   int has_hard_reg;
  46 } *clobber_list;
  47
  48 /* Records one insn that uses the clobber list.  */
  49
  50 struct clobber_ent
  51 {
  52   int code_number;              /* Counts only insns.  */
  53   struct clobber_ent *next;
  54 };
  55
  56 static void print_code                  (RTX_CODE);
  57 static void gen_exp                     (rtx, enum rtx_code, char *);
  58 static void gen_insn                    (rtx, int);
  59 static void gen_expand                  (rtx);
  60 static void gen_split                   (rtx);
  61 static void output_add_clobbers         (void);
  62 static void output_added_clobbers_hard_reg_p (void);
  63 static void gen_rtx_scratch             (rtx, enum rtx_code);
  64 static void output_peephole2_scratches  (rtx);
  65
  66 \f
  67 static void
  68 print_code (RTX_CODE code)
  69 {
  70   const char *p1;
  71   for (p1 = GET_RTX_NAME (code); *p1; p1++)
  72     putchar (TOUPPER(*p1));
  73 }
  74
  75 static void
  76 gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
  77 {
  78   if (subroutine_type == DEFINE_PEEPHOLE2)
  79     {
  80       printf ("operand%d", XINT (x, 0));
  81     }
  82   else
  83     {
  84       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
  85     }
  86 }
  87
  88 /* Print a C expression to construct an RTX just like X,
  89    substituting any operand references appearing within.  */
  90
  91 static void
  92 gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
  93 {
  94   RTX_CODE code;
  95   int i;
  96   int len;
  97   const char *fmt;
  98
  99   if (x == 0)
 100     {
 101       printf ("NULL_RTX");
 102       return;
 103     }
 104
 105   code = GET_CODE (x);
 106
 107   switch (code)
 108     {
 109     case MATCH_OPERAND:
 110     case MATCH_DUP:
 111       if (used)
 112         {
 113           if (used[XINT (x, 0)])
 114             {
 115               printf ("copy_rtx (operand%d)", XINT (x, 0));
 116               return;
 117             }
 118           used[XINT (x, 0)] = 1;
 119         }
 120       printf ("operand%d", XINT (x, 0));
 121       return;
 122
 123     case MATCH_OP_DUP:
 124       printf ("gen_rtx_fmt_");
 125       for (i = 0; i < XVECLEN (x, 1); i++)
 126         printf ("e");
 127       printf (" (GET_CODE (operand%d), ", XINT (x, 0));
 128       if (GET_MODE (x) == VOIDmode)
 129         printf ("GET_MODE (operand%d)", XINT (x, 0));
 130       else
 131         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 132       for (i = 0; i < XVECLEN (x, 1); i++)
 133         {
 134           printf (",\n\t\t");
 135           gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
 136         }
 137       printf (")");
 138       return;
 139
 140     case MATCH_OPERATOR:
 141       printf ("gen_rtx_fmt_");
 142       for (i = 0; i < XVECLEN (x, 2); i++)
 143         printf ("e");
 144       printf (" (GET_CODE (operand%d)", XINT (x, 0));
 145       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 146       for (i = 0; i < XVECLEN (x, 2); i++)
 147         {
 148           printf (",\n\t\t");
 149           gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
 150         }
 151       printf (")");
 152       return;
 153
 154     case MATCH_PARALLEL:
 155     case MATCH_PAR_DUP:
 156       printf ("operand%d", XINT (x, 0));
 157       return;
 158
 159     case MATCH_SCRATCH:
 160       gen_rtx_scratch (x, subroutine_type);
 161       return;
 162
 163     case ADDRESS:
 164       fatal ("ADDRESS expression code used in named instruction pattern");
 165
 166     case PC:
 167       printf ("pc_rtx");
 168       return;
 169     case RETURN:
 170       printf ("ret_rtx");
 171       return;
 172     case SIMPLE_RETURN:
 173       printf ("simple_return_rtx");
 174       return;
 175     case CLOBBER:
 176       if (REG_P (XEXP (x, 0)))
 177         {
 178           printf ("gen_hard_reg_clobber (%smode, %i)", GET_MODE_NAME (GET_MODE (XEXP (x, 0))),
 179                                                      REGNO (XEXP (x, 0)));
 180           return;
 181         }
 182       break;
 183
 184     case CC0:
 185       printf ("cc0_rtx");
 186       return;
 187
 188     case CONST_INT:
 189       if (INTVAL (x) == 0)
 190         printf ("const0_rtx");
 191       else if (INTVAL (x) == 1)
 192         printf ("const1_rtx");
 193       else if (INTVAL (x) == -1)
 194         printf ("constm1_rtx");
 195       else if (-MAX_SAVED_CONST_INT <= INTVAL (x)
 196           && INTVAL (x) <= MAX_SAVED_CONST_INT)
 197         printf ("const_int_rtx[MAX_SAVED_CONST_INT + (%d)]",
 198                 (int) INTVAL (x));
 199       else if (INTVAL (x) == STORE_FLAG_VALUE)
 200         printf ("const_true_rtx");
 201       else
 202         {
 203           printf ("GEN_INT (");
 204           printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
 205           printf (")");
 206         }
 207       return;
 208
 209     case CONST_DOUBLE:
 210     case CONST_FIXED:
 211       /* These shouldn't be written in MD files.  Instead, the appropriate
 212          routines in varasm.c should be called.  */
 213       gcc_unreachable ();
 214
 215     default:
 216       break;
 217     }
 218
 219   printf ("gen_rtx_");
 220   print_code (code);
 221   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 222
 223   fmt = GET_RTX_FORMAT (code);
 224   len = GET_RTX_LENGTH (code);
 225   for (i = 0; i < len; i++)
 226     {
 227       if (fmt[i] == '0')
 228         break;
 229       printf (",\n\t");
 230       switch (fmt[i])
 231         {
 232         case 'e': case 'u':
 233           gen_exp (XEXP (x, i), subroutine_type, used);
 234           break;
 235
 236         case 'i':
 237           printf ("%u", XINT (x, i));
 238           break;
 239
 240         case 's':
 241           printf ("\"%s\"", XSTR (x, i));
 242           break;
 243
 244         case 'E':
 245           {
 246             int j;
 247             printf ("gen_rtvec (%d", XVECLEN (x, i));
 248             for (j = 0; j < XVECLEN (x, i); j++)
 249               {
 250                 printf (",\n\t\t");
 251                 gen_exp (XVECEXP (x, i, j), subroutine_type, used);
 252               }
 253             printf (")");
 254             break;
 255           }
 256
 257         default:
 258           gcc_unreachable ();
 259         }
 260     }
 261   printf (")");
 262 }
 263 \f
 264 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 265
 266 static void
 267 gen_insn (rtx insn, int lineno)
 268 {
 269   struct pattern_stats stats;
 270   int i;
 271
 272   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 273      registers or MATCH_SCRATCHes.  If so, store away the information for
 274      later.  */
 275
 276   if (XVEC (insn, 1))
 277     {
 278       int has_hard_reg = 0;
 279
 280       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 281         {
 282           if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
 283             break;
 284
 285           if (REG_P (XEXP (XVECEXP (insn, 1, i), 0)))
 286             has_hard_reg = 1;
 287           else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
 288             break;
 289         }
 290
 291       if (i != XVECLEN (insn, 1) - 1)
 292         {
 293           struct clobber_pat *p;
 294           struct clobber_ent *link = XNEW (struct clobber_ent);
 295           int j;
 296
 297           link->code_number = insn_code_number;
 298
 299           /* See if any previous CLOBBER_LIST entry is the same as this
 300              one.  */
 301
 302           for (p = clobber_list; p; p = p->next)
 303             {
 304               if (p->first_clobber != i + 1
 305                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 306                 continue;
 307
 308               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 309                 {
 310                   rtx old_rtx = XEXP (XVECEXP (p->pattern, 1, j), 0);
 311                   rtx new_rtx = XEXP (XVECEXP (insn, 1, j), 0);
 312
 313                   /* OLD and NEW_INSN are the same if both are to be a SCRATCH
 314                      of the same mode,
 315                      or if both are registers of the same mode and number.  */
 316                   if (! (GET_MODE (old_rtx) == GET_MODE (new_rtx)
 317                          && ((GET_CODE (old_rtx) == MATCH_SCRATCH
 318                               && GET_CODE (new_rtx) == MATCH_SCRATCH)
 319                              || (REG_P (old_rtx) && REG_P (new_rtx)
 320                                  && REGNO (old_rtx) == REGNO (new_rtx)))))
 321                     break;
 322                 }
 323
 324               if (j == XVECLEN (insn, 1))
 325                 break;
 326             }
 327
 328           if (p == 0)
 329             {
 330               p = XNEW (struct clobber_pat);
 331
 332               p->insns = 0;
 333               p->pattern = insn;
 334               p->first_clobber = i + 1;
 335               p->next = clobber_list;
 336               p->has_hard_reg = has_hard_reg;
 337               clobber_list = p;
 338             }
 339
 340           link->next = p->insns;
 341           p->insns = link;
 342         }
 343     }
 344
 345   /* Don't mention instructions whose names are the null string
 346      or begin with '*'.  They are in the machine description just
 347      to be recognized.  */
 348   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 349     return;
 350
 351   printf ("/* %s:%d */\n", read_md_filename, lineno);
 352
 353   /* Find out how many operands this function has.  */
 354   get_pattern_stats (&stats, XVEC (insn, 1));
 355   if (stats.max_dup_opno > stats.max_opno)
 356     fatal ("match_dup operand number has no match_operand");
 357
 358   /* Output the function name and argument declarations.  */
 359   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 360   if (stats.num_generator_args)
 361     for (i = 0; i < stats.num_generator_args; i++)
 362       if (i)
 363         printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
 364       else
 365         printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
 366   else
 367     printf ("void");
 368   printf (")\n");
 369   printf ("{\n");
 370
 371   /* Output code to construct and return the rtl for the instruction body.  */
 372
 373   if (XVECLEN (insn, 1) == 1)
 374     {
 375       printf ("  return ");
 376       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
 377       printf (";\n}\n\n");
 378     }
 379   else
 380     {
 381       char *used = XCNEWVEC (char, stats.num_generator_args);
 382
 383       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 384               XVECLEN (insn, 1));
 385
 386       for (i = 0; i < XVECLEN (insn, 1); i++)
 387         {
 388           printf (",\n\t\t");
 389           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, used);
 390         }
 391       printf ("));\n}\n\n");
 392       XDELETEVEC (used);
 393     }
 394 }
 395 \f
 396 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 397
 398 static void
 399 gen_expand (rtx expand)
 400 {
 401   struct pattern_stats stats;
 402   int i;
 403   char *used;
 404
 405   if (strlen (XSTR (expand, 0)) == 0)
 406     fatal ("define_expand lacks a name");
 407   if (XVEC (expand, 1) == 0)
 408     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 409
 410   /* Find out how many operands this function has.  */
 411   get_pattern_stats (&stats, XVEC (expand, 1));
 412
 413   /* Output the function name and argument declarations.  */
 414   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 415   if (stats.num_generator_args)
 416     for (i = 0; i < stats.num_generator_args; i++)
 417       if (i)
 418         printf (",\n\trtx operand%d", i);
 419       else
 420         printf ("rtx operand%d", i);
 421   else
 422     printf ("void");
 423   printf (")\n");
 424   printf ("{\n");
 425
 426   /* If we don't have any C code to write, only one insn is being written,
 427      and no MATCH_DUPs are present, we can just return the desired insn
 428      like we do for a DEFINE_INSN.  This saves memory.  */
 429   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 430       && stats.max_opno >= stats.max_dup_opno
 431       && XVECLEN (expand, 1) == 1)
 432     {
 433       printf ("  return ");
 434       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
 435       printf (";\n}\n\n");
 436       return;
 437     }
 438
 439   /* For each operand referred to only with MATCH_DUPs,
 440      make a local variable.  */
 441   for (i = stats.num_generator_args; i <= stats.max_dup_opno; i++)
 442     printf ("  rtx operand%d;\n", i);
 443   for (; i <= stats.max_scratch_opno; i++)
 444     printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);
 445   printf ("  rtx _val = 0;\n");
 446   printf ("  start_sequence ();\n");
 447
 448   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 449      before the actual construction.
 450      This code expects to refer to `operands'
 451      just as the output-code in a DEFINE_INSN does,
 452      but here `operands' is an automatic array.
 453      So copy the operand values there before executing it.  */
 454   if (XSTR (expand, 3) && *XSTR (expand, 3))
 455     {
 456       printf ("  {\n");
 457       if (stats.num_operand_vars > 0)
 458         printf ("    rtx operands[%d];\n", stats.num_operand_vars);
 459
 460       /* Output code to copy the arguments into `operands'.  */
 461       for (i = 0; i < stats.num_generator_args; i++)
 462         printf ("    operands[%d] = operand%d;\n", i, i);
 463
 464       /* Output the special code to be executed before the sequence
 465          is generated.  */
 466       print_md_ptr_loc (XSTR (expand, 3));
 467       printf ("%s\n", XSTR (expand, 3));
 468
 469       /* Output code to copy the arguments back out of `operands'
 470          (unless we aren't going to use them at all).  */
 471       if (XVEC (expand, 1) != 0)
 472         {
 473           for (i = 0; i < stats.num_operand_vars; i++)
 474             {
 475               printf ("    operand%d = operands[%d];\n", i, i);
 476               printf ("    (void) operand%d;\n", i);
 477             }
 478         }
 479       printf ("  }\n");
 480     }
 481
 482   /* Output code to construct the rtl for the instruction bodies.
 483      Use emit_insn to add them to the sequence being accumulated.
 484      But don't do this if the user's code has set `no_more' nonzero.  */
 485
 486   used = XCNEWVEC (char, stats.num_operand_vars);
 487
 488   for (i = 0; i < XVECLEN (expand, 1); i++)
 489     {
 490       rtx next = XVECEXP (expand, 1, i);
 491       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 492           || (GET_CODE (next) == PARALLEL
 493               && ((GET_CODE (XVECEXP (next, 0, 0)) == SET
 494                    && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 495                   || ANY_RETURN_P (XVECEXP (next, 0, 0))))
 496           || ANY_RETURN_P (next))
 497         printf ("  emit_jump_insn (");
 498       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 499                || GET_CODE (next) == CALL
 500                || (GET_CODE (next) == PARALLEL
 501                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 502                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 503                || (GET_CODE (next) == PARALLEL
 504                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 505         printf ("  emit_call_insn (");
 506       else if (LABEL_P (next))
 507         printf ("  emit_label (");
 508       else if (GET_CODE (next) == MATCH_OPERAND
 509                || GET_CODE (next) == MATCH_DUP
 510                || GET_CODE (next) == MATCH_OPERATOR
 511                || GET_CODE (next) == MATCH_OP_DUP
 512                || GET_CODE (next) == MATCH_PARALLEL
 513                || GET_CODE (next) == MATCH_PAR_DUP
 514                || GET_CODE (next) == PARALLEL)
 515         printf ("  emit (");
 516       else
 517         printf ("  emit_insn (");
 518       gen_exp (next, DEFINE_EXPAND, used);
 519       printf (");\n");
 520       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 521           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 522         printf ("  emit_barrier ();");
 523     }
 524
 525   XDELETEVEC (used);
 526
 527   /* Call `get_insns' to extract the list of all the
 528      insns emitted within this gen_... function.  */
 529
 530   printf ("  _val = get_insns ();\n");
 531   printf ("  end_sequence ();\n");
 532   printf ("  return _val;\n}\n\n");
 533 }
 534
 535 /* Like gen_expand, but generates insns resulting from splitting SPLIT.  */
 536
 537 static void
 538 gen_split (rtx split)
 539 {
 540   struct pattern_stats stats;
 541   int i;
 542   const char *const name =
 543     ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
 544   const char *unused;
 545   char *used;
 546
 547   if (XVEC (split, 0) == 0)
 548     fatal ("define_%s (definition %d) lacks a pattern", name,
 549            insn_index_number);
 550   else if (XVEC (split, 2) == 0)
 551     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 552            insn_index_number);
 553
 554   /* Find out how many operands this function has.  */
 555
 556   get_pattern_stats (&stats, XVEC (split, 2));
 557   unused = (stats.num_operand_vars == 0 ? " ATTRIBUTE_UNUSED" : "");
 558   used = XCNEWVEC (char, stats.num_operand_vars);
 559
 560   /* Output the prototype, function name and argument declarations.  */
 561   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 562     {
 563       printf ("extern rtx gen_%s_%d (rtx, rtx *);\n",
 564               name, insn_code_number);
 565       printf ("rtx\ngen_%s_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 566               name, insn_code_number, unused);
 567     }
 568   else
 569     {
 570       printf ("extern rtx gen_split_%d (rtx, rtx *);\n", insn_code_number);
 571       printf ("rtx\ngen_split_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 572               insn_code_number, unused);
 573     }
 574   printf ("{\n");
 575
 576   /* Declare all local variables.  */
 577   for (i = 0; i < stats.num_operand_vars; i++)
 578     printf ("  rtx operand%d;\n", i);
 579   printf ("  rtx _val = 0;\n");
 580
 581   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 582     output_peephole2_scratches (split);
 583
 584   printf ("  start_sequence ();\n");
 585
 586   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 587      before the actual construction.  */
 588
 589   if (XSTR (split, 3))
 590     {
 591       print_md_ptr_loc (XSTR (split, 3));
 592       printf ("%s\n", XSTR (split, 3));
 593     }
 594
 595   /* Output code to copy the arguments back out of `operands'  */
 596   for (i = 0; i < stats.num_operand_vars; i++)
 597     {
 598       printf ("  operand%d = operands[%d];\n", i, i);
 599       printf ("  (void) operand%d;\n", i);
 600     }
 601
 602   /* Output code to construct the rtl for the instruction bodies.
 603      Use emit_insn to add them to the sequence being accumulated.
 604      But don't do this if the user's code has set `no_more' nonzero.  */
 605
 606   for (i = 0; i < XVECLEN (split, 2); i++)
 607     {
 608       rtx next = XVECEXP (split, 2, i);
 609       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 610           || (GET_CODE (next) == PARALLEL
 611               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 612               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 613           || ANY_RETURN_P (next))
 614         printf ("  emit_jump_insn (");
 615       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 616                || GET_CODE (next) == CALL
 617                || (GET_CODE (next) == PARALLEL
 618                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 619                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 620                || (GET_CODE (next) == PARALLEL
 621                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 622         printf ("  emit_call_insn (");
 623       else if (LABEL_P (next))
 624         printf ("  emit_label (");
 625       else if (GET_CODE (next) == MATCH_OPERAND
 626                || GET_CODE (next) == MATCH_OPERATOR
 627                || GET_CODE (next) == MATCH_PARALLEL
 628                || GET_CODE (next) == MATCH_OP_DUP
 629                || GET_CODE (next) == MATCH_DUP
 630                || GET_CODE (next) == PARALLEL)
 631         printf ("  emit (");
 632       else
 633         printf ("  emit_insn (");
 634       gen_exp (next, GET_CODE (split), used);
 635       printf (");\n");
 636       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 637           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 638         printf ("  emit_barrier ();");
 639     }
 640
 641   /* Call `get_insns' to make a list of all the
 642      insns emitted within this gen_... function.  */
 643
 644   printf ("  _val = get_insns ();\n");
 645   printf ("  end_sequence ();\n");
 646   printf ("  return _val;\n}\n\n");
 647
 648   free (used);
 649 }
 650 \f
 651 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 652    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 653    the end of the vector.  */
 654
 655 static void
 656 output_add_clobbers (void)
 657 {
 658   struct clobber_pat *clobber;
 659   struct clobber_ent *ent;
 660   int i;
 661
 662   printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
 663   printf ("{\n");
 664   printf ("  switch (insn_code_number)\n");
 665   printf ("    {\n");
 666
 667   for (clobber = clobber_list; clobber; clobber = clobber->next)
 668     {
 669       for (ent = clobber->insns; ent; ent = ent->next)
 670         printf ("    case %d:\n", ent->code_number);
 671
 672       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 673         {
 674           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 675           gen_exp (XVECEXP (clobber->pattern, 1, i),
 676                    GET_CODE (clobber->pattern), NULL);
 677           printf (";\n");
 678         }
 679
 680       printf ("      break;\n\n");
 681     }
 682
 683   printf ("    default:\n");
 684   printf ("      gcc_unreachable ();\n");
 685   printf ("    }\n");
 686   printf ("}\n");
 687 }
 688 \f
 689 /* Write a function, `added_clobbers_hard_reg_p' that is given an insn_code
 690    number that will have clobbers added (as indicated by `recog') and returns
 691    1 if those include a clobber of a hard reg or 0 if all of them just clobber
 692    SCRATCH.  */
 693
 694 static void
 695 output_added_clobbers_hard_reg_p (void)
 696 {
 697   struct clobber_pat *clobber;
 698   struct clobber_ent *ent;
 699   int clobber_p, used;
 700
 701   printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
 702   printf ("{\n");
 703   printf ("  switch (insn_code_number)\n");
 704   printf ("    {\n");
 705
 706   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
 707     {
 708       used = 0;
 709       for (clobber = clobber_list; clobber; clobber = clobber->next)
 710         if (clobber->has_hard_reg == clobber_p)
 711           for (ent = clobber->insns; ent; ent = ent->next)
 712             {
 713               printf ("    case %d:\n", ent->code_number);
 714               used++;
 715             }
 716
 717       if (used)
 718         printf ("      return %d;\n\n", clobber_p);
 719     }
 720
 721   printf ("    default:\n");
 722   printf ("      gcc_unreachable ();\n");
 723   printf ("    }\n");
 724   printf ("}\n");
 725 }
 726 \f
 727 /* Generate code to invoke find_free_register () as needed for the
 728    scratch registers used by the peephole2 pattern in SPLIT.  */
 729
 730 static void
 731 output_peephole2_scratches (rtx split)
 732 {
 733   int i;
 734   int insn_nr = 0;
 735   bool first = true;
 736
 737   for (i = 0; i < XVECLEN (split, 0); i++)
 738     {
 739       rtx elt = XVECEXP (split, 0, i);
 740       if (GET_CODE (elt) == MATCH_SCRATCH)
 741         {
 742           int last_insn_nr = insn_nr;
 743           int cur_insn_nr = insn_nr;
 744           int j;
 745           for (j = i + 1; j < XVECLEN (split, 0); j++)
 746             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 747               {
 748                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 749                   last_insn_nr = cur_insn_nr;
 750               }
 751             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 752               cur_insn_nr++;
 753
 754           if (first)
 755             {
 756               printf ("  HARD_REG_SET _regs_allocated;\n");
 757               printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 758               first = false;
 759             }
 760
 761           printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 762     return NULL;\n",
 763                   XINT (elt, 0),
 764                   insn_nr, last_insn_nr,
 765                   XSTR (elt, 1),
 766                   GET_MODE_NAME (GET_MODE (elt)));
 767
 768         }
 769       else if (GET_CODE (elt) != MATCH_DUP)
 770         insn_nr++;
 771     }
 772 }
 773
 774 int
 775 main (int argc, char **argv)
 776 {
 777   rtx desc;
 778
 779   progname = "genemit";
 780
 781   if (!init_rtx_reader_args (argc, argv))
 782     return (FATAL_EXIT_CODE);
 783
 784   /* Assign sequential codes to all entries in the machine description
 785      in parallel with the tables in insn-output.c.  */
 786
 787   insn_code_number = 0;
 788   insn_index_number = 0;
 789
 790   printf ("/* Generated automatically by the program `genemit'\n\
 791 from the machine description file `md'.  */\n\n");
 792
 793   printf ("#include \"config.h\"\n");
 794   printf ("#include \"system.h\"\n");
 795   printf ("#include \"coretypes.h\"\n");
 796   printf ("#include \"tm.h\"\n");
 797   printf ("#include \"rtl.h\"\n");
 798   printf ("#include \"tm_p.h\"\n");
 799   printf ("#include \"function.h\"\n");
 800   printf ("#include \"expr.h\"\n");
 801   printf ("#include \"optabs.h\"\n");
 802   printf ("#include \"dfp.h\"\n");
 803   printf ("#include \"flags.h\"\n");
 804   printf ("#include \"output.h\"\n");
 805   printf ("#include \"insn-config.h\"\n");
 806   printf ("#include \"hard-reg-set.h\"\n");
 807   printf ("#include \"recog.h\"\n");
 808   printf ("#include \"resource.h\"\n");
 809   printf ("#include \"reload.h\"\n");
 810   printf ("#include \"diagnostic-core.h\"\n");
 811   printf ("#include \"regs.h\"\n");
 812   printf ("#include \"tm-constrs.h\"\n");
 813   printf ("#include \"ggc.h\"\n");
 814   printf ("#include \"basic-block.h\"\n");
 815   printf ("#include \"integrate.h\"\n\n");
 816   printf ("#define FAIL return (end_sequence (), _val)\n");
 817   printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
 818
 819   /* Read the machine description.  */
 820
 821   while (1)
 822     {
 823       int line_no;
 824
 825       desc = read_md_rtx (&line_no, &insn_code_number);
 826       if (desc == NULL)
 827         break;
 828
 829       switch (GET_CODE (desc))
 830         {
 831         case DEFINE_INSN:
 832           gen_insn (desc, line_no);
 833           break;
 834
 835         case DEFINE_EXPAND:
 836           printf ("/* %s:%d */\n", read_md_filename, line_no);
 837           gen_expand (desc);
 838           break;
 839
 840         case DEFINE_SPLIT:
 841           printf ("/* %s:%d */\n", read_md_filename, line_no);
 842           gen_split (desc);
 843           break;
 844
 845         case DEFINE_PEEPHOLE2:
 846           printf ("/* %s:%d */\n", read_md_filename, line_no);
 847           gen_split (desc);
 848           break;
 849
 850         default:
 851           break;
 852         }
 853       ++insn_index_number;
 854     }
 855
 856   /* Write out the routines to add CLOBBERs to a pattern and say whether they
 857      clobber a hard reg.  */
 858   output_add_clobbers ();
 859   output_added_clobbers_hard_reg_p ();
 860
 861   fflush (stdout);
 862   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 863 }