gcc/print-rtl.c

   1 /* Print RTL for GCC.
   2    Copyright (C) 1987, 1988, 1992, 1997, 1998, 1999, 2000, 2002, 2003,
   3    2004, 2005, 2007
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 /* This file is compiled twice: once for the generator programs,
  23    once for the compiler.  */
  24 #ifdef GENERATOR_FILE
  25 #include "bconfig.h"
  26 #else
  27 #include "config.h"
  28 #endif
  29
  30 #include "system.h"
  31 #include "coretypes.h"
  32 #include "tm.h"
  33 #include "rtl.h"
  34
  35 /* These headers all define things which are not available in
  36    generator programs.  */
  37 #ifndef GENERATOR_FILE
  38 #include "tree.h"
  39 #include "real.h"
  40 #include "flags.h"
  41 #include "hard-reg-set.h"
  42 #include "basic-block.h"
  43 #endif
  44
  45 static FILE *outfile;
  46
  47 static int sawclose = 0;
  48
  49 static int indent;
  50
  51 static void print_rtx (rtx);
  52
  53 /* String printed at beginning of each RTL when it is dumped.
  54    This string is set to ASM_COMMENT_START when the RTL is dumped in
  55    the assembly output file.  */
  56 const char *print_rtx_head = "";
  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 means use simplified format without flags, modes, etc.  */
  64 int flag_simple = 0;
  65
  66 /* Nonzero if we are dumping graphical description.  */
  67 int dump_for_graph;
  68
  69 #ifndef GENERATOR_FILE
  70 static void
  71 print_decl_name (FILE *outfile, tree node)
  72 {
  73   if (DECL_NAME (node))
  74     fputs (IDENTIFIER_POINTER (DECL_NAME (node)), outfile);
  75   else
  76     {
  77       if (TREE_CODE (node) == LABEL_DECL && LABEL_DECL_UID (node) != -1)
  78         fprintf (outfile, "L." HOST_WIDE_INT_PRINT_DEC, LABEL_DECL_UID (node));
  79       else
  80         {
  81           char c = TREE_CODE (node) == CONST_DECL ? 'C' : 'D';
  82           fprintf (outfile, "%c.%u", c, DECL_UID (node));
  83         }
  84     }
  85 }
  86
  87 void
  88 print_mem_expr (FILE *outfile, tree expr)
  89 {
  90   if (TREE_CODE (expr) == COMPONENT_REF)
  91     {
  92       if (TREE_OPERAND (expr, 0))
  93         print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  94       else
  95         fputs (" <variable>", outfile);
  96       fputc ('.', outfile);
  97       print_decl_name (outfile, TREE_OPERAND (expr, 1));
  98     }
  99   else if (TREE_CODE (expr) == INDIRECT_REF)
 100     {
 101       fputs (" (*", outfile);
 102       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 103       fputs (")", outfile);
 104     }
 105   else if (TREE_CODE (expr) == ALIGN_INDIRECT_REF)
 106     {
 107       fputs (" (A*", outfile);
 108       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 109       fputs (")", outfile);
 110     }
 111   else if (TREE_CODE (expr) == MISALIGNED_INDIRECT_REF)
 112     {
 113       fputs (" (M*", outfile);
 114       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 115       fputs (")", outfile);
 116     }
 117   else if (TREE_CODE (expr) == RESULT_DECL)
 118     fputs (" <result>", outfile);
 119   else
 120     {
 121       fputc (' ', outfile);
 122       print_decl_name (outfile, expr);
 123     }
 124 }
 125 #endif
 126
 127 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
 128
 129 static void
 130 print_rtx (rtx in_rtx)
 131 {
 132   int i = 0;
 133   int j;
 134   const char *format_ptr;
 135   int is_insn;
 136
 137   if (sawclose)
 138     {
 139       if (flag_simple)
 140         fputc (' ', outfile);
 141       else
 142         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 143       sawclose = 0;
 144     }
 145
 146   if (in_rtx == 0)
 147     {
 148       fputs ("(nil)", outfile);
 149       sawclose = 1;
 150       return;
 151     }
 152   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 153     {
 154        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 155        sawclose = 1;
 156        return;
 157     }
 158
 159   is_insn = INSN_P (in_rtx);
 160
 161   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 162      in separate nodes and therefore have to handle them special here.  */
 163   if (dump_for_graph
 164       && (is_insn || NOTE_P (in_rtx)
 165           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 166     {
 167       i = 3;
 168       indent = 0;
 169     }
 170   else
 171     {
 172       /* Print name of expression code.  */
 173       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 174         fputc ('(', outfile);
 175       else
 176         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 177
 178       if (! flag_simple)
 179         {
 180           if (RTX_FLAG (in_rtx, in_struct))
 181             fputs ("/s", outfile);
 182
 183           if (RTX_FLAG (in_rtx, volatil))
 184             fputs ("/v", outfile);
 185
 186           if (RTX_FLAG (in_rtx, unchanging))
 187             fputs ("/u", outfile);
 188
 189           if (RTX_FLAG (in_rtx, frame_related))
 190             fputs ("/f", outfile);
 191
 192           if (RTX_FLAG (in_rtx, jump))
 193             fputs ("/j", outfile);
 194
 195           if (RTX_FLAG (in_rtx, call))
 196             fputs ("/c", outfile);
 197
 198           if (RTX_FLAG (in_rtx, return_val))
 199             fputs ("/i", outfile);
 200
 201           /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 202           if (GET_CODE (in_rtx) == EXPR_LIST
 203               || GET_CODE (in_rtx) == INSN_LIST)
 204             fprintf (outfile, ":%s",
 205                      GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 206
 207           /* For other rtl, print the mode if it's not VOID.  */
 208           else if (GET_MODE (in_rtx) != VOIDmode)
 209             fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 210         }
 211     }
 212
 213 #ifndef GENERATOR_FILE
 214   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 215     i = 5;
 216 #endif
 217
 218   /* Get the format string and skip the first elements if we have handled
 219      them already.  */
 220   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 221   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 222     switch (*format_ptr++)
 223       {
 224         const char *str;
 225
 226       case 'T':
 227         str = XTMPL (in_rtx, i);
 228         goto string;
 229
 230       case 'S':
 231       case 's':
 232         str = XSTR (in_rtx, i);
 233       string:
 234
 235         if (str == 0)
 236           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 237         else
 238           {
 239             if (dump_for_graph)
 240               fprintf (outfile, " (\\\"%s\\\")", str);
 241             else
 242               fprintf (outfile, " (\"%s\")", str);
 243           }
 244         sawclose = 1;
 245         break;
 246
 247         /* 0 indicates a field for internal use that should not be printed.
 248            An exception is the third field of a NOTE, where it indicates
 249            that the field has several different valid contents.  */
 250       case '0':
 251         if (i == 1 && REG_P (in_rtx))
 252           {
 253             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 254               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 255           }
 256 #ifndef GENERATOR_FILE
 257         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 258           {
 259             int flags = SYMBOL_REF_FLAGS (in_rtx);
 260             if (flags)
 261               fprintf (outfile, " [flags 0x%x]", flags);
 262           }
 263         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 264           {
 265             tree decl = SYMBOL_REF_DECL (in_rtx);
 266             if (decl)
 267               print_node_brief (outfile, "", decl, 0);
 268           }
 269 #endif
 270         else if (i == 4 && NOTE_P (in_rtx))
 271           {
 272             switch (NOTE_LINE_NUMBER (in_rtx))
 273               {
 274               case NOTE_INSN_EH_REGION_BEG:
 275               case NOTE_INSN_EH_REGION_END:
 276                 if (flag_dump_unnumbered)
 277                   fprintf (outfile, " #");
 278                 else
 279                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 280                 sawclose = 1;
 281                 break;
 282
 283               case NOTE_INSN_BLOCK_BEG:
 284               case NOTE_INSN_BLOCK_END:
 285 #ifndef GENERATOR_FILE
 286                 dump_addr (outfile, " ", NOTE_BLOCK (in_rtx));
 287 #endif
 288                 sawclose = 1;
 289                 break;
 290
 291               case NOTE_INSN_BASIC_BLOCK:
 292                 {
 293 #ifndef GENERATOR_FILE
 294                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 295                   if (bb != 0)
 296                     fprintf (outfile, " [bb %d]", bb->index);
 297 #endif
 298                   break;
 299                 }
 300
 301               case NOTE_INSN_EXPECTED_VALUE:
 302                 indent += 2;
 303                 if (!sawclose)
 304                   fprintf (outfile, " ");
 305                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 306                 indent -= 2;
 307                 break;
 308
 309               case NOTE_INSN_DELETED_LABEL:
 310                 {
 311                   const char *label = NOTE_DELETED_LABEL_NAME (in_rtx);
 312                   if (label)
 313                     fprintf (outfile, " (\"%s\")", label);
 314                   else
 315                     fprintf (outfile, " \"\"");
 316                 }
 317                 break;
 318
 319               case NOTE_INSN_SWITCH_TEXT_SECTIONS:
 320                 {
 321 #ifndef GENERATOR_FILE
 322                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 323                   if (bb != 0)
 324                     fprintf (outfile, " [bb %d]", bb->index);
 325 #endif
 326                   break;
 327                 }
 328
 329               case NOTE_INSN_VAR_LOCATION:
 330 #ifndef GENERATOR_FILE
 331                 fprintf (outfile, " (");
 332                 print_mem_expr (outfile, NOTE_VAR_LOCATION_DECL (in_rtx));
 333                 fprintf (outfile, " ");
 334                 print_rtx (NOTE_VAR_LOCATION_LOC (in_rtx));
 335                 fprintf (outfile, ")");
 336 #endif
 337                 break;
 338
 339               default:
 340                 {
 341                   const char * const str = X0STR (in_rtx, i);
 342
 343                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 344                     ;
 345                   else if (str == 0)
 346                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 347                   else
 348                     {
 349                       if (dump_for_graph)
 350                         fprintf (outfile, " (\\\"%s\\\")", str);
 351                       else
 352                         fprintf (outfile, " (\"%s\")", str);
 353                     }
 354                   break;
 355                 }
 356               }
 357           }
 358         break;
 359
 360       case 'e':
 361       do_e:
 362         indent += 2;
 363         if (!sawclose)
 364           fprintf (outfile, " ");
 365         print_rtx (XEXP (in_rtx, i));
 366         indent -= 2;
 367         break;
 368
 369       case 'E':
 370       case 'V':
 371         indent += 2;
 372         if (sawclose)
 373           {
 374             fprintf (outfile, "\n%s%*s",
 375                      print_rtx_head, indent * 2, "");
 376             sawclose = 0;
 377           }
 378         fputs (" [", outfile);
 379         if (NULL != XVEC (in_rtx, i))
 380           {
 381             indent += 2;
 382             if (XVECLEN (in_rtx, i))
 383               sawclose = 1;
 384
 385             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 386               print_rtx (XVECEXP (in_rtx, i, j));
 387
 388             indent -= 2;
 389           }
 390         if (sawclose)
 391           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 392
 393         fputs ("]", outfile);
 394         sawclose = 1;
 395         indent -= 2;
 396         break;
 397
 398       case 'w':
 399         if (! flag_simple)
 400           fprintf (outfile, " ");
 401         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 402         if (! flag_simple)
 403           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 404                    XWINT (in_rtx, i));
 405         break;
 406
 407       case 'i':
 408         if (i == 4 && INSN_P (in_rtx))
 409           {
 410 #ifndef GENERATOR_FILE
 411             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 412                 redundant with line number information and do not print anything
 413                 when there is no location information available.  */
 414             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 415               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 416 #endif
 417           }
 418         else if (i == 6 && NOTE_P (in_rtx))
 419           {
 420             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 421                other times often contains garbage from INSN->NOTE death.  */
 422             if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
 423               fprintf (outfile, " %d",  XINT (in_rtx, i));
 424           }
 425         else
 426           {
 427             int value = XINT (in_rtx, i);
 428             const char *name;
 429
 430 #ifndef GENERATOR_FILE
 431             if (REG_P (in_rtx) && value < FIRST_PSEUDO_REGISTER)
 432               fprintf (outfile, " %d %s", REGNO (in_rtx),
 433                        reg_names[REGNO (in_rtx)]);
 434             else if (REG_P (in_rtx)
 435                      && value <= LAST_VIRTUAL_REGISTER)
 436               {
 437                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 438                   fprintf (outfile, " %d virtual-incoming-args", value);
 439                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 440                   fprintf (outfile, " %d virtual-stack-vars", value);
 441                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 442                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 443                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 444                   fprintf (outfile, " %d virtual-outgoing-args", value);
 445                 else if (value == VIRTUAL_CFA_REGNUM)
 446                   fprintf (outfile, " %d virtual-cfa", value);
 447                 else
 448                   fprintf (outfile, " %d virtual-reg-%d", value,
 449                            value-FIRST_VIRTUAL_REGISTER);
 450               }
 451             else
 452 #endif
 453               if (flag_dump_unnumbered
 454                      && (is_insn || NOTE_P (in_rtx)))
 455               fputc ('#', outfile);
 456             else
 457               fprintf (outfile, " %d", value);
 458
 459 #ifndef GENERATOR_FILE
 460             if (REG_P (in_rtx) && REG_ATTRS (in_rtx))
 461               {
 462                 fputs (" [", outfile);
 463                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 464                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 465                 if (REG_EXPR (in_rtx))
 466                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 467
 468                 if (REG_OFFSET (in_rtx))
 469                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 470                            REG_OFFSET (in_rtx));
 471                 fputs (" ]", outfile);
 472               }
 473 #endif
 474
 475             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 476                 && XINT (in_rtx, i) >= 0
 477                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 478               fprintf (outfile, " {%s}", name);
 479             sawclose = 0;
 480           }
 481         break;
 482
 483       /* Print NOTE_INSN names rather than integer codes.  */
 484
 485       case 'n':
 486         if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
 487             && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
 488           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 489         else
 490           fprintf (outfile, " %d", XINT (in_rtx, i));
 491         sawclose = 0;
 492         break;
 493
 494       case 'u':
 495         if (XEXP (in_rtx, i) != NULL)
 496           {
 497             rtx sub = XEXP (in_rtx, i);
 498             enum rtx_code subc = GET_CODE (sub);
 499
 500             if (GET_CODE (in_rtx) == LABEL_REF)
 501               {
 502                 if (subc == NOTE
 503                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 504                   {
 505                     if (flag_dump_unnumbered)
 506                       fprintf (outfile, " [# deleted]");
 507                     else
 508                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 509                     sawclose = 0;
 510                     break;
 511                   }
 512
 513                 if (subc != CODE_LABEL)
 514                   goto do_e;
 515               }
 516
 517             if (flag_dump_unnumbered)
 518               fputs (" #", outfile);
 519             else
 520               fprintf (outfile, " %d", INSN_UID (sub));
 521           }
 522         else
 523           fputs (" 0", outfile);
 524         sawclose = 0;
 525         break;
 526
 527       case 'b':
 528 #ifndef GENERATOR_FILE
 529         if (XBITMAP (in_rtx, i) == NULL)
 530           fputs (" {null}", outfile);
 531         else
 532           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 533 #endif
 534         sawclose = 0;
 535         break;
 536
 537       case 't':
 538 #ifndef GENERATOR_FILE
 539         dump_addr (outfile, " ", XTREE (in_rtx, i));
 540 #endif
 541         break;
 542
 543       case '*':
 544         fputs (" Unknown", outfile);
 545         sawclose = 0;
 546         break;
 547
 548       case 'B':
 549 #ifndef GENERATOR_FILE
 550         if (XBBDEF (in_rtx, i))
 551           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 552 #endif
 553         break;
 554
 555       default:
 556         gcc_unreachable ();
 557       }
 558
 559   switch (GET_CODE (in_rtx))
 560     {
 561 #ifndef GENERATOR_FILE
 562     case MEM:
 563       fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 564
 565       if (MEM_EXPR (in_rtx))
 566         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 567
 568       if (MEM_OFFSET (in_rtx))
 569         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 570                  INTVAL (MEM_OFFSET (in_rtx)));
 571
 572       if (MEM_SIZE (in_rtx))
 573         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 574                  INTVAL (MEM_SIZE (in_rtx)));
 575
 576       if (MEM_ALIGN (in_rtx) != 1)
 577         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 578
 579       fputc (']', outfile);
 580       break;
 581
 582     case CONST_DOUBLE:
 583       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 584         {
 585           char s[60];
 586
 587           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 588                            sizeof (s), 0, 1);
 589           fprintf (outfile, " %s", s);
 590
 591           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 592                                sizeof (s), 0, 1);
 593           fprintf (outfile, " [%s]", s);
 594         }
 595       break;
 596 #endif
 597
 598     case CODE_LABEL:
 599       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 600       switch (LABEL_KIND (in_rtx))
 601         {
 602           case LABEL_NORMAL: break;
 603           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 604           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 605           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 606           default: gcc_unreachable ();
 607         }
 608       break;
 609
 610     default:
 611       break;
 612     }
 613
 614   if (dump_for_graph
 615       && (is_insn || NOTE_P (in_rtx)
 616           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 617     sawclose = 0;
 618   else
 619     {
 620       fputc (')', outfile);
 621       sawclose = 1;
 622     }
 623 }
 624
 625 /* Print an rtx on the current line of FILE.  Initially indent IND
 626    characters.  */
 627
 628 void
 629 print_inline_rtx (FILE *outf, rtx x, int ind)
 630 {
 631   int oldsaw = sawclose;
 632   int oldindent = indent;
 633
 634   sawclose = 0;
 635   indent = ind;
 636   outfile = outf;
 637   print_rtx (x);
 638   sawclose = oldsaw;
 639   indent = oldindent;
 640 }
 641
 642 /* Call this function from the debugger to see what X looks like.  */
 643
 644 void
 645 debug_rtx (rtx x)
 646 {
 647   outfile = stderr;
 648   sawclose = 0;
 649   print_rtx (x);
 650   fprintf (stderr, "\n");
 651 }
 652
 653 /* Count of rtx's to print with debug_rtx_list.
 654    This global exists because gdb user defined commands have no arguments.  */
 655
 656 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 657
 658 /* Call this function to print list from X on.
 659
 660    N is a count of the rtx's to print. Positive values print from the specified
 661    rtx on.  Negative values print a window around the rtx.
 662    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 663
 664 void
 665 debug_rtx_list (rtx x, int n)
 666 {
 667   int i,count;
 668   rtx insn;
 669
 670   count = n == 0 ? 1 : n < 0 ? -n : n;
 671
 672   /* If we are printing a window, back up to the start.  */
 673
 674   if (n < 0)
 675     for (i = count / 2; i > 0; i--)
 676       {
 677         if (PREV_INSN (x) == 0)
 678           break;
 679         x = PREV_INSN (x);
 680       }
 681
 682   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 683     {
 684       debug_rtx (insn);
 685       fprintf (stderr, "\n");
 686     }
 687 }
 688
 689 /* Call this function to print an rtx list from START to END inclusive.  */
 690
 691 void
 692 debug_rtx_range (rtx start, rtx end)
 693 {
 694   while (1)
 695     {
 696       debug_rtx (start);
 697       fprintf (stderr, "\n");
 698       if (!start || start == end)
 699         break;
 700       start = NEXT_INSN (start);
 701     }
 702 }
 703
 704 /* Call this function to search an rtx list to find one with insn uid UID,
 705    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 706    The found insn is returned to enable further debugging analysis.  */
 707
 708 rtx
 709 debug_rtx_find (rtx x, int uid)
 710 {
 711   while (x != 0 && INSN_UID (x) != uid)
 712     x = NEXT_INSN (x);
 713   if (x != 0)
 714     {
 715       debug_rtx_list (x, debug_rtx_count);
 716       return x;
 717     }
 718   else
 719     {
 720       fprintf (stderr, "insn uid %d not found\n", uid);
 721       return 0;
 722     }
 723 }
 724
 725 /* External entry point for printing a chain of insns
 726    starting with RTX_FIRST onto file OUTF.
 727    A blank line separates insns.
 728
 729    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 730
 731 void
 732 print_rtl (FILE *outf, rtx rtx_first)
 733 {
 734   rtx tmp_rtx;
 735
 736   outfile = outf;
 737   sawclose = 0;
 738
 739   if (rtx_first == 0)
 740     {
 741       fputs (print_rtx_head, outf);
 742       fputs ("(nil)\n", outf);
 743     }
 744   else
 745     switch (GET_CODE (rtx_first))
 746       {
 747       case INSN:
 748       case JUMP_INSN:
 749       case CALL_INSN:
 750       case NOTE:
 751       case CODE_LABEL:
 752       case BARRIER:
 753         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 754           if (! flag_dump_unnumbered
 755               || !NOTE_P (tmp_rtx) || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 756             {
 757               fputs (print_rtx_head, outfile);
 758               print_rtx (tmp_rtx);
 759               fprintf (outfile, "\n");
 760             }
 761         break;
 762
 763       default:
 764         fputs (print_rtx_head, outfile);
 765         print_rtx (rtx_first);
 766       }
 767 }
 768
 769 /* Like print_rtx, except specify a file.  */
 770 /* Return nonzero if we actually printed anything.  */
 771
 772 int
 773 print_rtl_single (FILE *outf, rtx x)
 774 {
 775   outfile = outf;
 776   sawclose = 0;
 777   if (! flag_dump_unnumbered
 778       || !NOTE_P (x) || NOTE_LINE_NUMBER (x) < 0)
 779     {
 780       fputs (print_rtx_head, outfile);
 781       print_rtx (x);
 782       putc ('\n', outf);
 783       return 1;
 784     }
 785   return 0;
 786 }
 787
 788
 789 /* Like print_rtl except without all the detail; for example,
 790    if RTX is a CONST_INT then print in decimal format.  */
 791
 792 void
 793 print_simple_rtl (FILE *outf, rtx x)
 794 {
 795   flag_simple = 1;
 796   print_rtl (outf, x);
 797   flag_simple = 0;
 798 }