gcc/print-rtl.c

   1 /* Print RTL for GNU C Compiler.
   2    Copyright (C) 1987, 1988, 1992, 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 "config.h"
  24 #include "system.h"
  25 #include "rtl.h"
  26 #include "real.h"
  27 #include "flags.h"
  28 #include "hard-reg-set.h"
  29 #include "basic-block.h"
  30
  31 /* How to print out a register name.
  32    We don't use PRINT_REG because some definitions of PRINT_REG
  33    don't work here.  */
  34 #ifndef DEBUG_PRINT_REG
  35 #define DEBUG_PRINT_REG(RTX, CODE, FILE) \
  36   fprintf ((FILE), "%d %s", REGNO (RTX), reg_names[REGNO (RTX)])
  37 #endif
  38
  39 /* Array containing all of the register names */
  40
  41 #ifdef DEBUG_REGISTER_NAMES
  42 static const char * const debug_reg_names[] = DEBUG_REGISTER_NAMES;
  43 #define reg_names debug_reg_names
  44 #else
  45 const char * reg_names[] = REGISTER_NAMES;
  46 #endif
  47
  48 static FILE *outfile;
  49
  50 static const char xspaces[] = "                                                                                                                                                                ";
  51
  52 static int sawclose = 0;
  53
  54 static int indent;
  55
  56 static void print_rtx           PARAMS ((rtx));
  57
  58 /* Nonzero means suppress output of instruction numbers and line number
  59    notes in debugging dumps.
  60    This must be defined here so that programs like gencodes can be linked.  */
  61 int flag_dump_unnumbered = 0;
  62
  63 /* Nonzero if we are dumping graphical description.  */
  64 int dump_for_graph;
  65
  66 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  67
  68 static void
  69 print_rtx (in_rtx)
  70      register rtx in_rtx;
  71 {
  72   register int i = 0;
  73   register int j;
  74   register const char *format_ptr;
  75   register int is_insn;
  76   rtx tem;
  77
  78   if (sawclose)
  79     {
  80       fprintf (outfile, "\n%s",
  81                (xspaces + (sizeof xspaces - 1 - indent * 2)));
  82       sawclose = 0;
  83     }
  84
  85   if (in_rtx == 0)
  86     {
  87       fputs ("(nil)", outfile);
  88       sawclose = 1;
  89       return;
  90     }
  91
  92   is_insn = (GET_RTX_CLASS (GET_CODE (in_rtx)) == 'i');
  93
  94   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
  95      in separate nodes and therefore have to handle them special here.  */
  96   if (dump_for_graph &&
  97       (is_insn || GET_CODE (in_rtx) == NOTE || GET_CODE (in_rtx) == CODE_LABEL
  98        || GET_CODE (in_rtx) == BARRIER))
  99     {
 100       i = 3;
 101       indent = 0;
 102     }
 103   else
 104     {
 105       /* print name of expression code */
 106       fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 107
 108       if (in_rtx->in_struct)
 109         fputs ("/s", outfile);
 110
 111       if (in_rtx->volatil)
 112         fputs ("/v", outfile);
 113
 114       if (in_rtx->unchanging)
 115         fputs ("/u", outfile);
 116
 117       if (in_rtx->integrated)
 118         fputs ("/i", outfile);
 119
 120       if (in_rtx->frame_related)
 121         fputs ("/f", outfile);
 122
 123       if (in_rtx->jump)
 124         fputs ("/j", outfile);
 125
 126       if (in_rtx->call)
 127         fputs ("/c", outfile);
 128
 129       if (GET_MODE (in_rtx) != VOIDmode)
 130         {
 131           /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 132           if (GET_CODE (in_rtx) == EXPR_LIST || GET_CODE (in_rtx) == INSN_LIST)
 133             fprintf (outfile, ":%s", GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 134           else
 135             fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 136         }
 137     }
 138
 139   /* Get the format string and skip the first elements if we have handled
 140      them already.  */
 141   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 142
 143   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 144     switch (*format_ptr++)
 145       {
 146       case 'S':
 147       case 's':
 148         if (XSTR (in_rtx, i) == 0)
 149           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 150         else
 151           {
 152             if (dump_for_graph)
 153               fprintf (outfile, " (\\\"%s\\\")", XSTR (in_rtx, i));
 154             else
 155               fprintf (outfile, " (\"%s\")", XSTR (in_rtx, i));
 156           }
 157         sawclose = 1;
 158         break;
 159
 160         /* 0 indicates a field for internal use that should not be printed.
 161            An exception is the third field of a NOTE, where it indicates
 162            that the field has several different valid contents.  */
 163       case '0':
 164         if (i == 3 && GET_CODE (in_rtx) == NOTE)
 165           {
 166             switch (NOTE_LINE_NUMBER (in_rtx))
 167               {
 168               case NOTE_INSN_EH_REGION_BEG:
 169               case NOTE_INSN_EH_REGION_END:
 170                 if (flag_dump_unnumbered)
 171                   fprintf (outfile, " #");
 172                 else
 173                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 174                 sawclose = 1;
 175                 break;
 176
 177               case NOTE_INSN_BLOCK_BEG:
 178               case NOTE_INSN_BLOCK_END:
 179                 fprintf (outfile, " ");
 180                 if (flag_dump_unnumbered)
 181                   fprintf (outfile, "#");
 182                 else
 183                   fprintf (outfile, HOST_PTR_PRINTF,
 184                            (char *) NOTE_BLOCK (in_rtx));
 185                 sawclose = 1;
 186                 break;
 187
 188               case NOTE_INSN_RANGE_BEG:
 189               case NOTE_INSN_RANGE_END:
 190               case NOTE_INSN_LIVE:
 191                 indent += 2;
 192                 if (!sawclose)
 193                   fprintf (outfile, " ");
 194                 print_rtx (NOTE_RANGE_INFO (in_rtx));
 195                 indent -= 2;
 196                 break;
 197
 198               case NOTE_INSN_BASIC_BLOCK:
 199                 {
 200                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 201                   if (bb != 0)
 202                     fprintf (outfile, " [bb %d]", bb->index);
 203                   break;
 204                 }
 205
 206               case NOTE_INSN_EXPECTED_VALUE:
 207                 indent += 2;
 208                 if (!sawclose)
 209                   fprintf (outfile, " ");
 210                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 211                 indent -= 2;
 212                 break;
 213
 214               case NOTE_INSN_DELETED_LABEL:
 215                 if (NOTE_SOURCE_FILE (in_rtx))
 216                   fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
 217                 else
 218                   fprintf (outfile, " \"\"");
 219                 break;
 220
 221               default:
 222                 {
 223                   const char * const str = X0STR (in_rtx, i);
 224
 225                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 226                     ;
 227                   else if (str == 0)
 228                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 229                   else
 230                     {
 231                       if (dump_for_graph)
 232                         fprintf (outfile, " (\\\"%s\\\")", str);
 233                       else
 234                         fprintf (outfile, " (\"%s\")", str);
 235                     }
 236                   break;
 237                 }
 238               }
 239           }
 240         break;
 241
 242       case 'e':
 243       do_e:
 244         indent += 2;
 245         if (!sawclose)
 246           fprintf (outfile, " ");
 247         print_rtx (XEXP (in_rtx, i));
 248         indent -= 2;
 249         break;
 250
 251       case 'E':
 252       case 'V':
 253         indent += 2;
 254         if (sawclose)
 255           {
 256             fprintf (outfile, "\n%s",
 257                      (xspaces + (sizeof xspaces - 1 - indent * 2)));
 258             sawclose = 0;
 259           }
 260         fputs ("[ ", outfile);
 261         if (NULL != XVEC (in_rtx, i))
 262           {
 263             indent += 2;
 264             if (XVECLEN (in_rtx, i))
 265               sawclose = 1;
 266
 267             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 268               print_rtx (XVECEXP (in_rtx, i, j));
 269
 270             indent -= 2;
 271           }
 272         if (sawclose)
 273           fprintf (outfile, "\n%s",
 274                    (xspaces + (sizeof xspaces - 1 - indent * 2)));
 275
 276         fputs ("] ", outfile);
 277         sawclose = 1;
 278         indent -= 2;
 279         break;
 280
 281       case 'w':
 282         fprintf (outfile, " ");
 283         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 284         fprintf (outfile, " [");
 285         fprintf (outfile, HOST_WIDE_INT_PRINT_HEX, XWINT (in_rtx, i));
 286         fprintf (outfile, "]");
 287         break;
 288
 289       case 'i':
 290         {
 291           register int value = XINT (in_rtx, i);
 292           const char *name;
 293
 294           if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 295             {
 296               fputc (' ', outfile);
 297               DEBUG_PRINT_REG (in_rtx, 0, outfile);
 298             }
 299           else if (GET_CODE (in_rtx) == REG && value <= LAST_VIRTUAL_REGISTER)
 300             {
 301               if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 302                 fprintf (outfile, " %d virtual-incoming-args", value);
 303               else if (value == VIRTUAL_STACK_VARS_REGNUM)
 304                 fprintf (outfile, " %d virtual-stack-vars", value);
 305               else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 306                 fprintf (outfile, " %d virtual-stack-dynamic", value);
 307               else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 308                 fprintf (outfile, " %d virtual-outgoing-args", value);
 309               else if (value == VIRTUAL_CFA_REGNUM)
 310                 fprintf (outfile, " %d virtual-cfa", value);
 311               else
 312                 fprintf (outfile, " %d virtual-reg-%d", value,
 313                          value-FIRST_VIRTUAL_REGISTER);
 314             }
 315           else if (flag_dump_unnumbered
 316                    && (is_insn || GET_CODE (in_rtx) == NOTE))
 317             fputc ('#', outfile);
 318           else
 319             fprintf (outfile, " %d", value);
 320
 321           if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 322               && XINT (in_rtx, i) >= 0
 323               && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 324             fprintf (outfile, " {%s}", name);
 325           sawclose = 0;
 326         }
 327         break;
 328
 329       /* Print NOTE_INSN names rather than integer codes.  */
 330
 331       case 'n':
 332         if (XINT (in_rtx, i) >= NOTE_INSN_BIAS
 333             && XINT (in_rtx, i) < NOTE_INSN_MAX)
 334           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 335         else
 336           fprintf (outfile, " %d", XINT (in_rtx, i));
 337         sawclose = 0;
 338         break;
 339
 340       case 'u':
 341         if (XEXP (in_rtx, i) != NULL)
 342           {
 343             rtx sub = XEXP (in_rtx, i);
 344             enum rtx_code subc = GET_CODE (sub);
 345
 346             if (GET_CODE (in_rtx) == LABEL_REF)
 347               {
 348                 if (subc == NOTE
 349                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 350                   {
 351                     if (flag_dump_unnumbered)
 352                       fprintf (outfile, " [# deleted]");
 353                     else
 354                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 355                     sawclose = 0;
 356                     break;
 357                   }
 358
 359                 if (subc != CODE_LABEL)
 360                   goto do_e;
 361               }
 362
 363             if (flag_dump_unnumbered)
 364               fputs (" #", outfile);
 365             else
 366               fprintf (outfile, " %d", INSN_UID (sub));
 367           }
 368         else
 369           fputs (" 0", outfile);
 370         sawclose = 0;
 371         break;
 372
 373       case 'b':
 374         if (XBITMAP (in_rtx, i) == NULL)
 375           fputs (" {null}", outfile);
 376         else
 377           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 378         sawclose = 0;
 379         break;
 380
 381       case 't':
 382         putc (' ', outfile);
 383         fprintf (outfile, HOST_PTR_PRINTF, (char *) XTREE (in_rtx, i));
 384         break;
 385
 386       case '*':
 387         fputs (" Unknown", outfile);
 388         sawclose = 0;
 389         break;
 390
 391       default:
 392         fprintf (stderr,
 393                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 394                  format_ptr[-1]);
 395         abort ();
 396       }
 397
 398   switch (GET_CODE (in_rtx))
 399     {
 400     case MEM:
 401       fputc (' ', outfile);
 402       fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 403       break;
 404
 405 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT && MAX_LONG_DOUBLE_TYPE_SIZE == 64
 406     case CONST_DOUBLE:
 407       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 408         {
 409           double val;
 410           REAL_VALUE_FROM_CONST_DOUBLE (val, in_rtx);
 411           fprintf (outfile, " [%.16g]", val);
 412         }
 413       break;
 414 #endif
 415
 416     case CODE_LABEL:
 417       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 418       if (LABEL_ALTERNATE_NAME (in_rtx))
 419         fprintf (outfile, " [alternate name: %s]",
 420                  LABEL_ALTERNATE_NAME (in_rtx));
 421       break;
 422
 423     case CALL_PLACEHOLDER:
 424       for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 425         if (GET_CODE (tem) == CALL_INSN)
 426           {
 427             fprintf (outfile, " ");
 428             print_rtx (tem);
 429             break;
 430           }
 431       break;
 432
 433     default:
 434       break;
 435     }
 436
 437   if (dump_for_graph
 438       && (is_insn || GET_CODE (in_rtx) == NOTE
 439           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 440     sawclose = 0;
 441   else
 442     {
 443       fputc (')', outfile);
 444       sawclose = 1;
 445     }
 446 }
 447
 448 /* Print an rtx on the current line of FILE.  Initially indent IND
 449    characters.  */
 450
 451 void
 452 print_inline_rtx (outf, x, ind)
 453      FILE *outf;
 454      rtx x;
 455      int ind;
 456 {
 457   int oldsaw = sawclose;
 458   int oldindent = indent;
 459
 460   sawclose = 0;
 461   indent = ind;
 462   outfile = outf;
 463   print_rtx (x);
 464   sawclose = oldsaw;
 465   indent = oldindent;
 466 }
 467
 468 /* Call this function from the debugger to see what X looks like.  */
 469
 470 void
 471 debug_rtx (x)
 472      rtx x;
 473 {
 474   outfile = stderr;
 475   print_rtx (x);
 476   fprintf (stderr, "\n");
 477 }
 478
 479 /* Count of rtx's to print with debug_rtx_list.
 480    This global exists because gdb user defined commands have no arguments.  */
 481
 482 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 483
 484 /* Call this function to print list from X on.
 485
 486    N is a count of the rtx's to print. Positive values print from the specified
 487    rtx on.  Negative values print a window around the rtx.
 488    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 489
 490 void
 491 debug_rtx_list (x, n)
 492      rtx x;
 493      int n;
 494 {
 495   int i,count;
 496   rtx insn;
 497
 498   count = n == 0 ? 1 : n < 0 ? -n : n;
 499
 500   /* If we are printing a window, back up to the start.  */
 501
 502   if (n < 0)
 503     for (i = count / 2; i > 0; i--)
 504       {
 505         if (PREV_INSN (x) == 0)
 506           break;
 507         x = PREV_INSN (x);
 508       }
 509
 510   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 511     debug_rtx (insn);
 512 }
 513
 514 /* Call this function to print an rtx list from START to END inclusive.  */
 515
 516 void
 517 debug_rtx_range (start, end)
 518      rtx start, end;
 519 {
 520   while (1)
 521     {
 522       debug_rtx (start);
 523       if (!start || start == end)
 524         break;
 525       start = NEXT_INSN (start);
 526     }
 527 }
 528
 529 /* Call this function to search an rtx list to find one with insn uid UID,
 530    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 531    The found insn is returned to enable further debugging analysis.  */
 532
 533 rtx
 534 debug_rtx_find (x, uid)
 535      rtx x;
 536      int uid;
 537 {
 538   while (x != 0 && INSN_UID (x) != uid)
 539     x = NEXT_INSN (x);
 540   if (x != 0)
 541     {
 542       debug_rtx_list (x, debug_rtx_count);
 543       return x;
 544     }
 545   else
 546     {
 547       fprintf (stderr, "insn uid %d not found\n", uid);
 548       return 0;
 549     }
 550 }
 551
 552 /* External entry point for printing a chain of insns
 553    starting with RTX_FIRST onto file OUTF.
 554    A blank line separates insns.
 555
 556    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 557
 558 void
 559 print_rtl (outf, rtx_first)
 560      FILE *outf;
 561      rtx rtx_first;
 562 {
 563   register rtx tmp_rtx;
 564
 565   outfile = outf;
 566   sawclose = 0;
 567
 568   if (rtx_first == 0)
 569     fputs ("(nil)\n", outf);
 570   else
 571     switch (GET_CODE (rtx_first))
 572       {
 573       case INSN:
 574       case JUMP_INSN:
 575       case CALL_INSN:
 576       case NOTE:
 577       case CODE_LABEL:
 578       case BARRIER:
 579         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 580           if (! flag_dump_unnumbered
 581               || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 582             {
 583               print_rtx (tmp_rtx);
 584               fprintf (outfile, "\n");
 585             }
 586         break;
 587
 588       default:
 589         print_rtx (rtx_first);
 590       }
 591 }
 592
 593 /* Like print_rtx, except specify a file.  */
 594 /* Return nonzero if we actually printed anything.  */
 595
 596 int
 597 print_rtl_single (outf, x)
 598      FILE *outf;
 599      rtx x;
 600 {
 601   outfile = outf;
 602   sawclose = 0;
 603   if (! flag_dump_unnumbered
 604       || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
 605     {
 606       print_rtx (x);
 607       putc ('\n', outf);
 608       return 1;
 609     }
 610   return 0;
 611 }