gcc/print-rtl.c

   1 /* Print RTL for GCC.
   2    Copyright (C) 1987, 1988, 1992, 1997, 1998, 1999, 2000, 2002, 2003, 2004
   3    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 2, 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 COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27 #include "rtl.h"
  28
  29 /* We don't want the tree code checking code for the access to the
  30    DECL_NAME to be included in the gen* programs.  */
  31 #undef ENABLE_TREE_CHECKING
  32 #include "tree.h"
  33 #include "real.h"
  34 #include "flags.h"
  35 #include "hard-reg-set.h"
  36 #include "basic-block.h"
  37 #include "tm_p.h"
  38
  39 static FILE *outfile;
  40
  41 static int sawclose = 0;
  42
  43 static int indent;
  44
  45 static void print_rtx (rtx);
  46
  47 /* String printed at beginning of each RTL when it is dumped.
  48    This string is set to ASM_COMMENT_START when the RTL is dumped in
  49    the assembly output file.  */
  50 const char *print_rtx_head = "";
  51
  52 /* Nonzero means suppress output of instruction numbers and line number
  53    notes in debugging dumps.
  54    This must be defined here so that programs like gencodes can be linked.  */
  55 int flag_dump_unnumbered = 0;
  56
  57 /* Nonzero means use simplified format without flags, modes, etc.  */
  58 int flag_simple = 0;
  59
  60 /* Nonzero if we are dumping graphical description.  */
  61 int dump_for_graph;
  62
  63 void
  64 print_mem_expr (FILE *outfile, tree expr)
  65 {
  66   if (TREE_CODE (expr) == COMPONENT_REF)
  67     {
  68       if (TREE_OPERAND (expr, 0))
  69         print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  70       else
  71         fputs (" <variable>", outfile);
  72       if (DECL_NAME (TREE_OPERAND (expr, 1)))
  73         fprintf (outfile, ".%s",
  74                  IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (expr, 1))));
  75     }
  76   else if (TREE_CODE (expr) == INDIRECT_REF)
  77     {
  78       fputs (" (*", outfile);
  79       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  80       fputs (")", outfile);
  81     }
  82   else if (DECL_NAME (expr))
  83     fprintf (outfile, " %s", IDENTIFIER_POINTER (DECL_NAME (expr)));
  84   else if (TREE_CODE (expr) == RESULT_DECL)
  85     fputs (" <result>", outfile);
  86   else
  87     fputs (" <anonymous>", outfile);
  88 }
  89
  90 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  91
  92 static void
  93 print_rtx (rtx in_rtx)
  94 {
  95   int i = 0;
  96   int j;
  97   const char *format_ptr;
  98   int is_insn;
  99
 100   if (sawclose)
 101     {
 102       if (flag_simple)
 103         fputc (' ', outfile);
 104       else
 105         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 106       sawclose = 0;
 107     }
 108
 109   if (in_rtx == 0)
 110     {
 111       fputs ("(nil)", outfile);
 112       sawclose = 1;
 113       return;
 114     }
 115   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 116     {
 117        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 118        sawclose = 1;
 119        return;
 120     }
 121
 122   is_insn = INSN_P (in_rtx);
 123
 124   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 125      in separate nodes and therefore have to handle them special here.  */
 126   if (dump_for_graph
 127       && (is_insn || GET_CODE (in_rtx) == NOTE
 128           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 129     {
 130       i = 3;
 131       indent = 0;
 132     }
 133   else
 134     {
 135       /* Print name of expression code.  */
 136       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 137         fputc ('(', outfile);
 138       else
 139         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 140
 141       if (! flag_simple)
 142         {
 143           if (RTX_FLAG (in_rtx, in_struct))
 144             fputs ("/s", outfile);
 145
 146           if (RTX_FLAG (in_rtx, volatil))
 147             fputs ("/v", outfile);
 148
 149           if (RTX_FLAG (in_rtx, unchanging))
 150             fputs ("/u", outfile);
 151
 152           if (RTX_FLAG (in_rtx, frame_related))
 153             fputs ("/f", outfile);
 154
 155           if (RTX_FLAG (in_rtx, jump))
 156             fputs ("/j", outfile);
 157
 158           if (RTX_FLAG (in_rtx, call))
 159             fputs ("/c", outfile);
 160
 161           if (RTX_FLAG (in_rtx, return_val))
 162             fputs ("/i", outfile);
 163
 164           if (GET_MODE (in_rtx) != VOIDmode)
 165             {
 166               /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 167               if (GET_CODE (in_rtx) == EXPR_LIST
 168                   || GET_CODE (in_rtx) == INSN_LIST)
 169                 fprintf (outfile, ":%s",
 170                          GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 171               else
 172                 fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 173             }
 174         }
 175     }
 176
 177 #ifndef GENERATOR_FILE
 178   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 179     i = 5;
 180 #endif
 181
 182   /* Get the format string and skip the first elements if we have handled
 183      them already.  */
 184   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 185   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 186     switch (*format_ptr++)
 187       {
 188         const char *str;
 189
 190       case 'T':
 191         str = XTMPL (in_rtx, i);
 192         goto string;
 193
 194       case 'S':
 195       case 's':
 196         str = XSTR (in_rtx, i);
 197       string:
 198
 199         if (str == 0)
 200           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 201         else
 202           {
 203             if (dump_for_graph)
 204               fprintf (outfile, " (\\\"%s\\\")", str);
 205             else
 206               fprintf (outfile, " (\"%s\")", str);
 207           }
 208         sawclose = 1;
 209         break;
 210
 211         /* 0 indicates a field for internal use that should not be printed.
 212            An exception is the third field of a NOTE, where it indicates
 213            that the field has several different valid contents.  */
 214       case '0':
 215         if (i == 1 && REG_P (in_rtx))
 216           {
 217             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 218               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 219           }
 220 #ifndef GENERATOR_FILE
 221         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 222           {
 223             int flags = SYMBOL_REF_FLAGS (in_rtx);
 224             if (flags)
 225               fprintf (outfile, " [flags 0x%x]", flags);
 226           }
 227         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 228           {
 229             tree decl = SYMBOL_REF_DECL (in_rtx);
 230             if (decl)
 231               print_node_brief (outfile, "", decl, 0);
 232           }
 233 #endif
 234         else if (i == 4 && GET_CODE (in_rtx) == NOTE)
 235           {
 236             switch (NOTE_LINE_NUMBER (in_rtx))
 237               {
 238               case NOTE_INSN_EH_REGION_BEG:
 239               case NOTE_INSN_EH_REGION_END:
 240                 if (flag_dump_unnumbered)
 241                   fprintf (outfile, " #");
 242                 else
 243                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 244                 sawclose = 1;
 245                 break;
 246
 247               case NOTE_INSN_BLOCK_BEG:
 248               case NOTE_INSN_BLOCK_END:
 249                 fprintf (outfile, " ");
 250                 if (flag_dump_unnumbered)
 251                   fprintf (outfile, "#");
 252                 else
 253                   fprintf (outfile, HOST_PTR_PRINTF,
 254                            (char *) NOTE_BLOCK (in_rtx));
 255                 sawclose = 1;
 256                 break;
 257
 258               case NOTE_INSN_BASIC_BLOCK:
 259                 {
 260                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 261                   if (bb != 0)
 262                     fprintf (outfile, " [bb %d]", bb->index);
 263                   break;
 264                 }
 265
 266               case NOTE_INSN_EXPECTED_VALUE:
 267                 indent += 2;
 268                 if (!sawclose)
 269                   fprintf (outfile, " ");
 270                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 271                 indent -= 2;
 272                 break;
 273
 274               case NOTE_INSN_DELETED_LABEL:
 275                 if (NOTE_SOURCE_FILE (in_rtx))
 276                   fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
 277                 else
 278                   fprintf (outfile, " \"\"");
 279                 break;
 280
 281               case NOTE_INSN_PREDICTION:
 282                 if (NOTE_PREDICTION (in_rtx))
 283                   fprintf (outfile, " [ %d %d ] ",
 284                            (int)NOTE_PREDICTION_ALG (in_rtx),
 285                            (int) NOTE_PREDICTION_FLAGS (in_rtx));
 286                 else
 287                   fprintf (outfile, " [ ERROR ]");
 288                 break;
 289
 290               case NOTE_INSN_UNLIKELY_EXECUTED_CODE:
 291                 {
 292                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 293                   if (bb != 0)
 294                     fprintf (outfile, " [bb %d]", bb->index);
 295                   break;
 296                 }
 297
 298               case NOTE_INSN_VAR_LOCATION:
 299                 fprintf (outfile, " (");
 300                 print_mem_expr (outfile, NOTE_VAR_LOCATION_DECL (in_rtx));
 301                 fprintf (outfile, " ");
 302                 print_rtx (NOTE_VAR_LOCATION_LOC (in_rtx));
 303                 fprintf (outfile, ")");
 304                 break;
 305
 306               default:
 307                 {
 308                   const char * const str = X0STR (in_rtx, i);
 309
 310                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 311                     ;
 312                   else if (str == 0)
 313                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 314                   else
 315                     {
 316                       if (dump_for_graph)
 317                         fprintf (outfile, " (\\\"%s\\\")", str);
 318                       else
 319                         fprintf (outfile, " (\"%s\")", str);
 320                     }
 321                   break;
 322                 }
 323               }
 324           }
 325         break;
 326
 327       case 'e':
 328       do_e:
 329         indent += 2;
 330         if (!sawclose)
 331           fprintf (outfile, " ");
 332         print_rtx (XEXP (in_rtx, i));
 333         indent -= 2;
 334         break;
 335
 336       case 'E':
 337       case 'V':
 338         indent += 2;
 339         if (sawclose)
 340           {
 341             fprintf (outfile, "\n%s%*s",
 342                      print_rtx_head, indent * 2, "");
 343             sawclose = 0;
 344           }
 345         fputs (" [", outfile);
 346         if (NULL != XVEC (in_rtx, i))
 347           {
 348             indent += 2;
 349             if (XVECLEN (in_rtx, i))
 350               sawclose = 1;
 351
 352             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 353               print_rtx (XVECEXP (in_rtx, i, j));
 354
 355             indent -= 2;
 356           }
 357         if (sawclose)
 358           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 359
 360         fputs ("]", outfile);
 361         sawclose = 1;
 362         indent -= 2;
 363         break;
 364
 365       case 'w':
 366         if (! flag_simple)
 367           fprintf (outfile, " ");
 368         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 369         if (! flag_simple)
 370           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 371                    XWINT (in_rtx, i));
 372         break;
 373
 374       case 'i':
 375         if (i == 4 && INSN_P (in_rtx))
 376           {
 377 #ifndef GENERATOR_FILE
 378             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 379                 redundant with line number information and do not print anything
 380                 when there is no location information available.  */
 381             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 382               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 383 #endif
 384           }
 385         else if (i == 6 && GET_CODE (in_rtx) == NOTE)
 386           {
 387             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 388                other times often contains garbage from INSN->NOTE death.  */
 389             if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
 390               fprintf (outfile, " %d",  XINT (in_rtx, i));
 391           }
 392         else
 393           {
 394             int value = XINT (in_rtx, i);
 395             const char *name;
 396
 397 #ifndef GENERATOR_FILE
 398             if (REG_P (in_rtx) && value < FIRST_PSEUDO_REGISTER)
 399               fprintf (outfile, " %d %s", REGNO (in_rtx),
 400                        reg_names[REGNO (in_rtx)]);
 401             else if (REG_P (in_rtx)
 402                      && value <= LAST_VIRTUAL_REGISTER)
 403               {
 404                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 405                   fprintf (outfile, " %d virtual-incoming-args", value);
 406                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 407                   fprintf (outfile, " %d virtual-stack-vars", value);
 408                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 409                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 410                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 411                   fprintf (outfile, " %d virtual-outgoing-args", value);
 412                 else if (value == VIRTUAL_CFA_REGNUM)
 413                   fprintf (outfile, " %d virtual-cfa", value);
 414                 else
 415                   fprintf (outfile, " %d virtual-reg-%d", value,
 416                            value-FIRST_VIRTUAL_REGISTER);
 417               }
 418             else
 419 #endif
 420               if (flag_dump_unnumbered
 421                      && (is_insn || GET_CODE (in_rtx) == NOTE))
 422               fputc ('#', outfile);
 423             else
 424               fprintf (outfile, " %d", value);
 425
 426             if (REG_P (in_rtx) && REG_ATTRS (in_rtx))
 427               {
 428                 fputs (" [", outfile);
 429                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 430                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 431                 if (REG_EXPR (in_rtx))
 432                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 433
 434                 if (REG_OFFSET (in_rtx))
 435                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 436                            REG_OFFSET (in_rtx));
 437                 fputs (" ]", outfile);
 438               }
 439
 440             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 441                 && XINT (in_rtx, i) >= 0
 442                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 443               fprintf (outfile, " {%s}", name);
 444             sawclose = 0;
 445           }
 446         break;
 447
 448       /* Print NOTE_INSN names rather than integer codes.  */
 449
 450       case 'n':
 451         if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
 452             && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
 453           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 454         else
 455           fprintf (outfile, " %d", XINT (in_rtx, i));
 456         sawclose = 0;
 457         break;
 458
 459       case 'u':
 460         if (XEXP (in_rtx, i) != NULL)
 461           {
 462             rtx sub = XEXP (in_rtx, i);
 463             enum rtx_code subc = GET_CODE (sub);
 464
 465             if (GET_CODE (in_rtx) == LABEL_REF)
 466               {
 467                 if (subc == NOTE
 468                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 469                   {
 470                     if (flag_dump_unnumbered)
 471                       fprintf (outfile, " [# deleted]");
 472                     else
 473                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 474                     sawclose = 0;
 475                     break;
 476                   }
 477
 478                 if (subc != CODE_LABEL)
 479                   goto do_e;
 480               }
 481
 482             if (flag_dump_unnumbered)
 483               fputs (" #", outfile);
 484             else
 485               fprintf (outfile, " %d", INSN_UID (sub));
 486           }
 487         else
 488           fputs (" 0", outfile);
 489         sawclose = 0;
 490         break;
 491
 492       case 'b':
 493         if (XBITMAP (in_rtx, i) == NULL)
 494           fputs (" {null}", outfile);
 495         else
 496           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 497         sawclose = 0;
 498         break;
 499
 500       case 't':
 501         fprintf (outfile, " " HOST_PTR_PRINTF, (void *) XTREE (in_rtx, i));
 502         break;
 503
 504       case '*':
 505         fputs (" Unknown", outfile);
 506         sawclose = 0;
 507         break;
 508
 509       case 'B':
 510         if (XBBDEF (in_rtx, i))
 511           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 512         break;
 513
 514       default:
 515         fprintf (stderr,
 516                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 517                  format_ptr[-1]);
 518         abort ();
 519       }
 520
 521   switch (GET_CODE (in_rtx))
 522     {
 523 #ifndef GENERATOR_FILE
 524     case MEM:
 525       fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 526
 527       if (MEM_EXPR (in_rtx))
 528         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 529
 530       if (MEM_OFFSET (in_rtx))
 531         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 532                  INTVAL (MEM_OFFSET (in_rtx)));
 533
 534       if (MEM_SIZE (in_rtx))
 535         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 536                  INTVAL (MEM_SIZE (in_rtx)));
 537
 538       if (MEM_ALIGN (in_rtx) != 1)
 539         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 540
 541       fputc (']', outfile);
 542       break;
 543
 544     case CONST_DOUBLE:
 545       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 546         {
 547           char s[60];
 548
 549           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 550                            sizeof (s), 0, 1);
 551           fprintf (outfile, " %s", s);
 552
 553           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 554                                sizeof (s), 0, 1);
 555           fprintf (outfile, " [%s]", s);
 556         }
 557       break;
 558 #endif
 559
 560     case CODE_LABEL:
 561       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 562       switch (LABEL_KIND (in_rtx))
 563         {
 564           case LABEL_NORMAL: break;
 565           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 566           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 567           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 568           default: abort();
 569         }
 570       break;
 571
 572     default:
 573       break;
 574     }
 575
 576   if (dump_for_graph
 577       && (is_insn || GET_CODE (in_rtx) == NOTE
 578           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 579     sawclose = 0;
 580   else
 581     {
 582       fputc (')', outfile);
 583       sawclose = 1;
 584     }
 585 }
 586
 587 /* Print an rtx on the current line of FILE.  Initially indent IND
 588    characters.  */
 589
 590 void
 591 print_inline_rtx (FILE *outf, rtx x, int ind)
 592 {
 593   int oldsaw = sawclose;
 594   int oldindent = indent;
 595
 596   sawclose = 0;
 597   indent = ind;
 598   outfile = outf;
 599   print_rtx (x);
 600   sawclose = oldsaw;
 601   indent = oldindent;
 602 }
 603
 604 /* Call this function from the debugger to see what X looks like.  */
 605
 606 void
 607 debug_rtx (rtx x)
 608 {
 609   outfile = stderr;
 610   sawclose = 0;
 611   print_rtx (x);
 612   fprintf (stderr, "\n");
 613 }
 614
 615 /* Count of rtx's to print with debug_rtx_list.
 616    This global exists because gdb user defined commands have no arguments.  */
 617
 618 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 619
 620 /* Call this function to print list from X on.
 621
 622    N is a count of the rtx's to print. Positive values print from the specified
 623    rtx on.  Negative values print a window around the rtx.
 624    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 625
 626 void
 627 debug_rtx_list (rtx x, int n)
 628 {
 629   int i,count;
 630   rtx insn;
 631
 632   count = n == 0 ? 1 : n < 0 ? -n : n;
 633
 634   /* If we are printing a window, back up to the start.  */
 635
 636   if (n < 0)
 637     for (i = count / 2; i > 0; i--)
 638       {
 639         if (PREV_INSN (x) == 0)
 640           break;
 641         x = PREV_INSN (x);
 642       }
 643
 644   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 645     {
 646       debug_rtx (insn);
 647       fprintf (stderr, "\n");
 648     }
 649 }
 650
 651 /* Call this function to print an rtx list from START to END inclusive.  */
 652
 653 void
 654 debug_rtx_range (rtx start, rtx end)
 655 {
 656   while (1)
 657     {
 658       debug_rtx (start);
 659       fprintf (stderr, "\n");
 660       if (!start || start == end)
 661         break;
 662       start = NEXT_INSN (start);
 663     }
 664 }
 665
 666 /* Call this function to search an rtx list to find one with insn uid UID,
 667    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 668    The found insn is returned to enable further debugging analysis.  */
 669
 670 rtx
 671 debug_rtx_find (rtx x, int uid)
 672 {
 673   while (x != 0 && INSN_UID (x) != uid)
 674     x = NEXT_INSN (x);
 675   if (x != 0)
 676     {
 677       debug_rtx_list (x, debug_rtx_count);
 678       return x;
 679     }
 680   else
 681     {
 682       fprintf (stderr, "insn uid %d not found\n", uid);
 683       return 0;
 684     }
 685 }
 686
 687 /* External entry point for printing a chain of insns
 688    starting with RTX_FIRST onto file OUTF.
 689    A blank line separates insns.
 690
 691    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 692
 693 void
 694 print_rtl (FILE *outf, rtx rtx_first)
 695 {
 696   rtx tmp_rtx;
 697
 698   outfile = outf;
 699   sawclose = 0;
 700
 701   if (rtx_first == 0)
 702     {
 703       fputs (print_rtx_head, outf);
 704       fputs ("(nil)\n", outf);
 705     }
 706   else
 707     switch (GET_CODE (rtx_first))
 708       {
 709       case INSN:
 710       case JUMP_INSN:
 711       case CALL_INSN:
 712       case NOTE:
 713       case CODE_LABEL:
 714       case BARRIER:
 715         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 716           if (! flag_dump_unnumbered
 717               || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 718             {
 719               fputs (print_rtx_head, outfile);
 720               print_rtx (tmp_rtx);
 721               fprintf (outfile, "\n");
 722             }
 723         break;
 724
 725       default:
 726         fputs (print_rtx_head, outfile);
 727         print_rtx (rtx_first);
 728       }
 729 }
 730
 731 /* Like print_rtx, except specify a file.  */
 732 /* Return nonzero if we actually printed anything.  */
 733
 734 int
 735 print_rtl_single (FILE *outf, rtx x)
 736 {
 737   outfile = outf;
 738   sawclose = 0;
 739   if (! flag_dump_unnumbered
 740       || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
 741     {
 742       fputs (print_rtx_head, outfile);
 743       print_rtx (x);
 744       putc ('\n', outf);
 745       return 1;
 746     }
 747   return 0;
 748 }
 749
 750
 751 /* Like print_rtl except without all the detail; for example,
 752    if RTX is a CONST_INT then print in decimal format.  */
 753
 754 void
 755 print_simple_rtl (FILE *outf, rtx x)
 756 {
 757   flag_simple = 1;
 758   print_rtl (outf, x);
 759   flag_simple = 0;
 760 }