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