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 /* String printed at beginning of each RTL when it is dumped.
  59    This string is set to ASM_COMMENT_START when the RTL is dumped in
  60    the assembly output file.  */
  61 const char *print_rtx_head = "";
  62
  63 /* Nonzero means suppress output of instruction numbers and line number
  64    notes in debugging dumps.
  65    This must be defined here so that programs like gencodes can be linked.  */
  66 int flag_dump_unnumbered = 0;
  67
  68 /* Nonzero means use simplified format without flags, modes, etc.  */
  69 int flag_simple = 0;
  70
  71 /* Nonzero if we are dumping graphical description.  */
  72 int dump_for_graph;
  73
  74 /* Nonzero to dump all call_placeholder alternatives.  */
  75 static int debug_call_placeholder_verbose;
  76
  77 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  78
  79 static void
  80 print_rtx (in_rtx)
  81      register rtx in_rtx;
  82 {
  83   register int i = 0;
  84   register int j;
  85   register const char *format_ptr;
  86   register int is_insn;
  87   rtx tem;
  88
  89   if (sawclose)
  90     {
  91       if (flag_simple)
  92         fputc (' ', outfile);
  93       else
  94         fprintf (outfile, "\n%s%s",
  95                  print_rtx_head,
  96                  (xspaces + (sizeof xspaces - 1 - indent * 2)));
  97       sawclose = 0;
  98     }
  99
 100   if (in_rtx == 0)
 101     {
 102       fputs ("(nil)", outfile);
 103       sawclose = 1;
 104       return;
 105     }
 106
 107   is_insn = (INSN_P (in_rtx));
 108
 109   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 110      in separate nodes and therefore have to handle them special here.  */
 111   if (dump_for_graph &&
 112       (is_insn || GET_CODE (in_rtx) == NOTE || GET_CODE (in_rtx) == CODE_LABEL
 113        || GET_CODE (in_rtx) == BARRIER))
 114     {
 115       i = 3;
 116       indent = 0;
 117     }
 118   else
 119     {
 120       /* print name of expression code */
 121       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 122         fputc ('(', outfile);
 123       else
 124         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 125
 126       if (! flag_simple)
 127         {
 128           if (in_rtx->in_struct)
 129             fputs ("/s", outfile);
 130
 131           if (in_rtx->volatil)
 132             fputs ("/v", outfile);
 133
 134           if (in_rtx->unchanging)
 135             fputs ("/u", outfile);
 136
 137           if (in_rtx->integrated)
 138             fputs ("/i", outfile);
 139
 140           if (in_rtx->frame_related)
 141             fputs ("/f", outfile);
 142
 143           if (in_rtx->jump)
 144             fputs ("/j", outfile);
 145
 146           if (in_rtx->call)
 147             fputs ("/c", outfile);
 148
 149           if (GET_MODE (in_rtx) != VOIDmode)
 150             {
 151               /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 152               if (GET_CODE (in_rtx) == EXPR_LIST
 153                   || GET_CODE (in_rtx) == INSN_LIST)
 154                 fprintf (outfile, ":%s",
 155                          GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 156               else
 157                 fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 158             }
 159         }
 160     }
 161
 162   /* Get the format string and skip the first elements if we have handled
 163      them already.  */
 164   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 165
 166   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 167     switch (*format_ptr++)
 168       {
 169       case 'S':
 170       case 's':
 171         if (XSTR (in_rtx, i) == 0)
 172           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 173         else
 174           {
 175             if (dump_for_graph)
 176               fprintf (outfile, " (\\\"%s\\\")", XSTR (in_rtx, i));
 177             else
 178               fprintf (outfile, " (\"%s\")", XSTR (in_rtx, i));
 179           }
 180         sawclose = 1;
 181         break;
 182
 183         /* 0 indicates a field for internal use that should not be printed.
 184            An exception is the third field of a NOTE, where it indicates
 185            that the field has several different valid contents.  */
 186       case '0':
 187         if (i == 1 && GET_CODE (in_rtx) == REG)
 188           {
 189             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 190               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 191             break;
 192           }
 193         if (i == 3 && GET_CODE (in_rtx) == NOTE)
 194           {
 195             switch (NOTE_LINE_NUMBER (in_rtx))
 196               {
 197               case NOTE_INSN_EH_REGION_BEG:
 198               case NOTE_INSN_EH_REGION_END:
 199                 if (flag_dump_unnumbered)
 200                   fprintf (outfile, " #");
 201                 else
 202                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 203                 sawclose = 1;
 204                 break;
 205
 206               case NOTE_INSN_BLOCK_BEG:
 207               case NOTE_INSN_BLOCK_END:
 208                 fprintf (outfile, " ");
 209                 if (flag_dump_unnumbered)
 210                   fprintf (outfile, "#");
 211                 else
 212                   fprintf (outfile, HOST_PTR_PRINTF,
 213                            (char *) NOTE_BLOCK (in_rtx));
 214                 sawclose = 1;
 215                 break;
 216
 217               case NOTE_INSN_RANGE_BEG:
 218               case NOTE_INSN_RANGE_END:
 219               case NOTE_INSN_LIVE:
 220                 indent += 2;
 221                 if (!sawclose)
 222                   fprintf (outfile, " ");
 223                 print_rtx (NOTE_RANGE_INFO (in_rtx));
 224                 indent -= 2;
 225                 break;
 226
 227               case NOTE_INSN_BASIC_BLOCK:
 228                 {
 229                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 230                   if (bb != 0)
 231                     fprintf (outfile, " [bb %d]", bb->index);
 232                   break;
 233                 }
 234
 235               case NOTE_INSN_EXPECTED_VALUE:
 236                 indent += 2;
 237                 if (!sawclose)
 238                   fprintf (outfile, " ");
 239                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 240                 indent -= 2;
 241                 break;
 242
 243               case NOTE_INSN_DELETED_LABEL:
 244                 if (NOTE_SOURCE_FILE (in_rtx))
 245                   fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
 246                 else
 247                   fprintf (outfile, " \"\"");
 248                 break;
 249
 250               default:
 251                 {
 252                   const char * const str = X0STR (in_rtx, i);
 253
 254                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 255                     ;
 256                   else if (str == 0)
 257                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 258                   else
 259                     {
 260                       if (dump_for_graph)
 261                         fprintf (outfile, " (\\\"%s\\\")", str);
 262                       else
 263                         fprintf (outfile, " (\"%s\")", str);
 264                     }
 265                   break;
 266                 }
 267               }
 268           }
 269         break;
 270
 271       case 'e':
 272       do_e:
 273         indent += 2;
 274         if (!sawclose)
 275           fprintf (outfile, " ");
 276         print_rtx (XEXP (in_rtx, i));
 277         indent -= 2;
 278         break;
 279
 280       case 'E':
 281       case 'V':
 282         indent += 2;
 283         if (sawclose)
 284           {
 285             fprintf (outfile, "\n%s%s",
 286                      print_rtx_head,
 287                      (xspaces + (sizeof xspaces - 1 - indent * 2)));
 288             sawclose = 0;
 289           }
 290         fputs ("[ ", outfile);
 291         if (NULL != XVEC (in_rtx, i))
 292           {
 293             indent += 2;
 294             if (XVECLEN (in_rtx, i))
 295               sawclose = 1;
 296
 297             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 298               print_rtx (XVECEXP (in_rtx, i, j));
 299
 300             indent -= 2;
 301           }
 302         if (sawclose)
 303           fprintf (outfile, "\n%s%s",
 304                    print_rtx_head,
 305                    (xspaces + (sizeof xspaces - 1 - indent * 2)));
 306
 307         fputs ("] ", outfile);
 308         sawclose = 1;
 309         indent -= 2;
 310         break;
 311
 312       case 'w':
 313         if (! flag_simple)
 314           fprintf (outfile, " ");
 315         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 316         if (! flag_simple)
 317           {
 318             fprintf (outfile, " [");
 319             fprintf (outfile, HOST_WIDE_INT_PRINT_HEX, XWINT (in_rtx, i));
 320             fprintf (outfile, "]");
 321           }
 322         break;
 323
 324       case 'i':
 325         {
 326           register int value = XINT (in_rtx, i);
 327           const char *name;
 328
 329           if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 330             {
 331               fputc (' ', outfile);
 332               DEBUG_PRINT_REG (in_rtx, 0, outfile);
 333             }
 334           else if (GET_CODE (in_rtx) == REG && value <= LAST_VIRTUAL_REGISTER)
 335             {
 336               if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 337                 fprintf (outfile, " %d virtual-incoming-args", value);
 338               else if (value == VIRTUAL_STACK_VARS_REGNUM)
 339                 fprintf (outfile, " %d virtual-stack-vars", value);
 340               else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 341                 fprintf (outfile, " %d virtual-stack-dynamic", value);
 342               else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 343                 fprintf (outfile, " %d virtual-outgoing-args", value);
 344               else if (value == VIRTUAL_CFA_REGNUM)
 345                 fprintf (outfile, " %d virtual-cfa", value);
 346               else
 347                 fprintf (outfile, " %d virtual-reg-%d", value,
 348                          value-FIRST_VIRTUAL_REGISTER);
 349             }
 350           else if (flag_dump_unnumbered
 351                    && (is_insn || GET_CODE (in_rtx) == NOTE))
 352             fputc ('#', outfile);
 353           else
 354             fprintf (outfile, " %d", value);
 355
 356           if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 357               && XINT (in_rtx, i) >= 0
 358               && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 359             fprintf (outfile, " {%s}", name);
 360           sawclose = 0;
 361         }
 362         break;
 363
 364       /* Print NOTE_INSN names rather than integer codes.  */
 365
 366       case 'n':
 367         if (XINT (in_rtx, i) >= NOTE_INSN_BIAS
 368             && XINT (in_rtx, i) < NOTE_INSN_MAX)
 369           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 370         else
 371           fprintf (outfile, " %d", XINT (in_rtx, i));
 372         sawclose = 0;
 373         break;
 374
 375       case 'u':
 376         if (XEXP (in_rtx, i) != NULL)
 377           {
 378             rtx sub = XEXP (in_rtx, i);
 379             enum rtx_code subc = GET_CODE (sub);
 380
 381             if (GET_CODE (in_rtx) == LABEL_REF)
 382               {
 383                 if (subc == NOTE
 384                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 385                   {
 386                     if (flag_dump_unnumbered)
 387                       fprintf (outfile, " [# deleted]");
 388                     else
 389                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 390                     sawclose = 0;
 391                     break;
 392                   }
 393
 394                 if (subc != CODE_LABEL)
 395                   goto do_e;
 396               }
 397
 398             if (flag_dump_unnumbered)
 399               fputs (" #", outfile);
 400             else
 401               fprintf (outfile, " %d", INSN_UID (sub));
 402           }
 403         else
 404           fputs (" 0", outfile);
 405         sawclose = 0;
 406         break;
 407
 408       case 'b':
 409         if (XBITMAP (in_rtx, i) == NULL)
 410           fputs (" {null}", outfile);
 411         else
 412           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 413         sawclose = 0;
 414         break;
 415
 416       case 't':
 417         putc (' ', outfile);
 418         fprintf (outfile, HOST_PTR_PRINTF, (char *) XTREE (in_rtx, i));
 419         break;
 420
 421       case '*':
 422         fputs (" Unknown", outfile);
 423         sawclose = 0;
 424         break;
 425
 426       default:
 427         fprintf (stderr,
 428                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 429                  format_ptr[-1]);
 430         abort ();
 431       }
 432
 433   switch (GET_CODE (in_rtx))
 434     {
 435     case MEM:
 436       fputc (' ', outfile);
 437       fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 438       break;
 439
 440 #if HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT && MAX_LONG_DOUBLE_TYPE_SIZE == 64
 441     case CONST_DOUBLE:
 442       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 443         {
 444           double val;
 445           REAL_VALUE_FROM_CONST_DOUBLE (val, in_rtx);
 446           fprintf (outfile, " [%.16g]", val);
 447         }
 448       break;
 449 #endif
 450
 451     case CODE_LABEL:
 452       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 453       if (LABEL_ALTERNATE_NAME (in_rtx))
 454         fprintf (outfile, " [alternate name: %s]",
 455                  LABEL_ALTERNATE_NAME (in_rtx));
 456       break;
 457
 458     case CALL_PLACEHOLDER:
 459       if (debug_call_placeholder_verbose)
 460         {
 461           fputs (" (cond [\n  (const_string \"normal\") (sequence [", outfile);
 462           for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 463             {
 464               fputs ("\n    ", outfile);
 465               print_inline_rtx (outfile, tem, 4);
 466             }
 467
 468           tem = XEXP (in_rtx, 1);
 469           if (tem)
 470             fputs ("\n    ])\n  (const_string \"tail_call\") (sequence [", outfile);
 471           for (; tem != 0; tem = NEXT_INSN (tem))
 472             {
 473               fputs ("\n    ", outfile);
 474               print_inline_rtx (outfile, tem, 4);
 475             }
 476
 477           tem = XEXP (in_rtx, 2);
 478           if (tem)
 479             fputs ("\n    ])\n  (const_string \"tail_recursion\") (sequence [", outfile);
 480           for (; tem != 0; tem = NEXT_INSN (tem))
 481             {
 482               fputs ("\n    ", outfile);
 483               print_inline_rtx (outfile, tem, 4);
 484             }
 485
 486           fputs ("\n    ])\n  ])", outfile);
 487           break;
 488         }
 489
 490       for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 491         if (GET_CODE (tem) == CALL_INSN)
 492           {
 493             fprintf (outfile, " ");
 494             print_rtx (tem);
 495             break;
 496           }
 497       break;
 498
 499     default:
 500       break;
 501     }
 502
 503   if (dump_for_graph
 504       && (is_insn || GET_CODE (in_rtx) == NOTE
 505           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 506     sawclose = 0;
 507   else
 508     {
 509       fputc (')', outfile);
 510       sawclose = 1;
 511     }
 512 }
 513
 514 /* Print an rtx on the current line of FILE.  Initially indent IND
 515    characters.  */
 516
 517 void
 518 print_inline_rtx (outf, x, ind)
 519      FILE *outf;
 520      rtx x;
 521      int ind;
 522 {
 523   int oldsaw = sawclose;
 524   int oldindent = indent;
 525
 526   sawclose = 0;
 527   indent = ind;
 528   outfile = outf;
 529   print_rtx (x);
 530   sawclose = oldsaw;
 531   indent = oldindent;
 532 }
 533
 534 /* Call this function from the debugger to see what X looks like.  */
 535
 536 void
 537 debug_rtx (x)
 538      rtx x;
 539 {
 540   outfile = stderr;
 541   print_rtx (x);
 542   fprintf (stderr, "\n");
 543 }
 544
 545 /* Count of rtx's to print with debug_rtx_list.
 546    This global exists because gdb user defined commands have no arguments.  */
 547
 548 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 549
 550 /* Call this function to print list from X on.
 551
 552    N is a count of the rtx's to print. Positive values print from the specified
 553    rtx on.  Negative values print a window around the rtx.
 554    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 555
 556 void
 557 debug_rtx_list (x, n)
 558      rtx x;
 559      int n;
 560 {
 561   int i,count;
 562   rtx insn;
 563
 564   count = n == 0 ? 1 : n < 0 ? -n : n;
 565
 566   /* If we are printing a window, back up to the start.  */
 567
 568   if (n < 0)
 569     for (i = count / 2; i > 0; i--)
 570       {
 571         if (PREV_INSN (x) == 0)
 572           break;
 573         x = PREV_INSN (x);
 574       }
 575
 576   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 577     debug_rtx (insn);
 578 }
 579
 580 /* Call this function to print an rtx list from START to END inclusive.  */
 581
 582 void
 583 debug_rtx_range (start, end)
 584      rtx start, end;
 585 {
 586   while (1)
 587     {
 588       debug_rtx (start);
 589       if (!start || start == end)
 590         break;
 591       start = NEXT_INSN (start);
 592     }
 593 }
 594
 595 /* Call this function to search an rtx list to find one with insn uid UID,
 596    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 597    The found insn is returned to enable further debugging analysis.  */
 598
 599 rtx
 600 debug_rtx_find (x, uid)
 601      rtx x;
 602      int uid;
 603 {
 604   while (x != 0 && INSN_UID (x) != uid)
 605     x = NEXT_INSN (x);
 606   if (x != 0)
 607     {
 608       debug_rtx_list (x, debug_rtx_count);
 609       return x;
 610     }
 611   else
 612     {
 613       fprintf (stderr, "insn uid %d not found\n", uid);
 614       return 0;
 615     }
 616 }
 617
 618 /* External entry point for printing a chain of insns
 619    starting with RTX_FIRST onto file OUTF.
 620    A blank line separates insns.
 621
 622    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 623
 624 void
 625 print_rtl (outf, rtx_first)
 626      FILE *outf;
 627      rtx rtx_first;
 628 {
 629   register rtx tmp_rtx;
 630
 631   outfile = outf;
 632   sawclose = 0;
 633
 634   if (rtx_first == 0)
 635     {
 636       fputs (print_rtx_head, outf);
 637       fputs ("(nil)\n", outf);
 638     }
 639   else
 640     switch (GET_CODE (rtx_first))
 641       {
 642       case INSN:
 643       case JUMP_INSN:
 644       case CALL_INSN:
 645       case NOTE:
 646       case CODE_LABEL:
 647       case BARRIER:
 648         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 649           if (! flag_dump_unnumbered
 650               || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 651             {
 652               fputs (print_rtx_head, outfile);
 653               print_rtx (tmp_rtx);
 654               fprintf (outfile, "\n");
 655             }
 656         break;
 657
 658       default:
 659         fputs (print_rtx_head, outfile);
 660         print_rtx (rtx_first);
 661       }
 662 }
 663
 664 /* Like print_rtx, except specify a file.  */
 665 /* Return nonzero if we actually printed anything.  */
 666
 667 int
 668 print_rtl_single (outf, x)
 669      FILE *outf;
 670      rtx x;
 671 {
 672   outfile = outf;
 673   sawclose = 0;
 674   if (! flag_dump_unnumbered
 675       || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
 676     {
 677       fputs (print_rtx_head, outfile);
 678       print_rtx (x);
 679       putc ('\n', outf);
 680       return 1;
 681     }
 682   return 0;
 683 }
 684
 685
 686 /* Like print_rtl except without all the detail; for example,
 687    if RTX is a CONST_INT then print in decimal format.  */
 688
 689 void
 690 print_simple_rtl (outf, x)
 691      FILE *outf;
 692      rtx x;
 693 {
 694   flag_simple = 1;
 695   print_rtl (outf, x);
 696   flag_simple = 0;
 697 }