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 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
  38 /* How to print out a register name.
  39    We don't use PRINT_REG because some definitions of PRINT_REG
  40    don't work here.  */
  41 #ifndef DEBUG_PRINT_REG
  42 #define DEBUG_PRINT_REG(RTX, CODE, FILE) \
  43   fprintf ((FILE), "%d %s", REGNO (RTX), reg_names[REGNO (RTX)])
  44 #endif
  45
  46 /* Array containing all of the register names */
  47
  48 #ifdef DEBUG_REGISTER_NAMES
  49 static const char * const debug_reg_names[] = DEBUG_REGISTER_NAMES;
  50 #define reg_names debug_reg_names
  51 #else
  52 const char * reg_names[] = REGISTER_NAMES;
  53 #endif
  54
  55 static FILE *outfile;
  56
  57 static int sawclose = 0;
  58
  59 static int indent;
  60
  61 static void print_rtx           PARAMS ((rtx));
  62
  63 /* String printed at beginning of each RTL when it is dumped.
  64    This string is set to ASM_COMMENT_START when the RTL is dumped in
  65    the assembly output file.  */
  66 const char *print_rtx_head = "";
  67
  68 /* Nonzero means suppress output of instruction numbers and line number
  69    notes in debugging dumps.
  70    This must be defined here so that programs like gencodes can be linked.  */
  71 int flag_dump_unnumbered = 0;
  72
  73 /* Nonzero means use simplified format without flags, modes, etc.  */
  74 int flag_simple = 0;
  75
  76 /* Nonzero if we are dumping graphical description.  */
  77 int dump_for_graph;
  78
  79 /* Nonzero to dump all call_placeholder alternatives.  */
  80 static int debug_call_placeholder_verbose;
  81
  82 void
  83 print_mem_expr (outfile, expr)
  84      FILE *outfile;
  85      tree expr;
  86 {
  87   if (TREE_CODE (expr) == COMPONENT_REF)
  88     {
  89       if (TREE_OPERAND (expr, 0))
  90         print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  91       else
  92         fputs (" <variable>", outfile);
  93       if (DECL_NAME (TREE_OPERAND (expr, 1)))
  94         fprintf (outfile, ".%s",
  95                  IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (expr, 1))));
  96     }
  97   else if (TREE_CODE (expr) == INDIRECT_REF)
  98     {
  99       fputs (" (*", outfile);
 100       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 101       fputs (")", outfile);
 102     }
 103   else if (DECL_NAME (expr))
 104     fprintf (outfile, " %s", IDENTIFIER_POINTER (DECL_NAME (expr)));
 105   else if (TREE_CODE (expr) == RESULT_DECL)
 106     fputs (" <result>", outfile);
 107   else
 108     fputs (" <anonymous>", outfile);
 109 }
 110
 111 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
 112
 113 static void
 114 print_rtx (in_rtx)
 115      rtx in_rtx;
 116 {
 117   int i = 0;
 118   int j;
 119   const char *format_ptr;
 120   int is_insn;
 121   rtx tem;
 122
 123   if (sawclose)
 124     {
 125       if (flag_simple)
 126         fputc (' ', outfile);
 127       else
 128         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 129       sawclose = 0;
 130     }
 131
 132   if (in_rtx == 0)
 133     {
 134       fputs ("(nil)", outfile);
 135       sawclose = 1;
 136       return;
 137     }
 138   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 139     {
 140        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 141        sawclose = 1;
 142        return;
 143     }
 144
 145   is_insn = INSN_P (in_rtx);
 146
 147   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 148      in separate nodes and therefore have to handle them special here.  */
 149   if (dump_for_graph
 150       && (is_insn || GET_CODE (in_rtx) == NOTE
 151           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 152     {
 153       i = 3;
 154       indent = 0;
 155     }
 156   else
 157     {
 158       /* Print name of expression code.  */
 159       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 160         fputc ('(', outfile);
 161       else
 162         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 163
 164       if (! flag_simple)
 165         {
 166           if (RTX_FLAG (in_rtx, in_struct))
 167             fputs ("/s", outfile);
 168
 169           if (RTX_FLAG (in_rtx, volatil))
 170             fputs ("/v", outfile);
 171
 172           if (RTX_FLAG (in_rtx, unchanging))
 173             fputs ("/u", outfile);
 174
 175           if (RTX_FLAG (in_rtx, integrated))
 176             fputs ("/i", outfile);
 177
 178           if (RTX_FLAG (in_rtx, frame_related))
 179             fputs ("/f", outfile);
 180
 181           if (RTX_FLAG (in_rtx, jump))
 182             fputs ("/j", outfile);
 183
 184           if (RTX_FLAG (in_rtx, call))
 185             fputs ("/c", outfile);
 186
 187           if (GET_MODE (in_rtx) != VOIDmode)
 188             {
 189               /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 190               if (GET_CODE (in_rtx) == EXPR_LIST
 191                   || GET_CODE (in_rtx) == INSN_LIST)
 192                 fprintf (outfile, ":%s",
 193                          GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 194               else
 195                 fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 196             }
 197         }
 198     }
 199
 200 #ifndef GENERATOR_FILE
 201   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 202     i = 5;
 203 #endif
 204
 205   /* Get the format string and skip the first elements if we have handled
 206      them already.  */
 207   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 208   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 209     switch (*format_ptr++)
 210       {
 211         const char *str;
 212
 213       case 'T':
 214         str = XTMPL (in_rtx, i);
 215         goto string;
 216
 217       case 'S':
 218       case 's':
 219         str = XSTR (in_rtx, i);
 220       string:
 221
 222         if (str == 0)
 223           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 224         else
 225           {
 226             if (dump_for_graph)
 227               fprintf (outfile, " (\\\"%s\\\")", str);
 228             else
 229               fprintf (outfile, " (\"%s\")", str);
 230           }
 231         sawclose = 1;
 232         break;
 233
 234         /* 0 indicates a field for internal use that should not be printed.
 235            An exception is the third field of a NOTE, where it indicates
 236            that the field has several different valid contents.  */
 237       case '0':
 238         if (i == 1 && GET_CODE (in_rtx) == REG)
 239           {
 240             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 241               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 242             break;
 243           }
 244         if (i == 4 && GET_CODE (in_rtx) == NOTE)
 245           {
 246             switch (NOTE_LINE_NUMBER (in_rtx))
 247               {
 248               case NOTE_INSN_EH_REGION_BEG:
 249               case NOTE_INSN_EH_REGION_END:
 250                 if (flag_dump_unnumbered)
 251                   fprintf (outfile, " #");
 252                 else
 253                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 254                 sawclose = 1;
 255                 break;
 256
 257               case NOTE_INSN_BLOCK_BEG:
 258               case NOTE_INSN_BLOCK_END:
 259                 fprintf (outfile, " ");
 260                 if (flag_dump_unnumbered)
 261                   fprintf (outfile, "#");
 262                 else
 263                   fprintf (outfile, HOST_PTR_PRINTF,
 264                            (char *) NOTE_BLOCK (in_rtx));
 265                 sawclose = 1;
 266                 break;
 267
 268               case NOTE_INSN_BASIC_BLOCK:
 269                 {
 270                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 271                   if (bb != 0)
 272                     fprintf (outfile, " [bb %d]", bb->index);
 273                   break;
 274                 }
 275
 276               case NOTE_INSN_EXPECTED_VALUE:
 277                 indent += 2;
 278                 if (!sawclose)
 279                   fprintf (outfile, " ");
 280                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 281                 indent -= 2;
 282                 break;
 283
 284               case NOTE_INSN_DELETED_LABEL:
 285                 if (NOTE_SOURCE_FILE (in_rtx))
 286                   fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
 287                 else
 288                   fprintf (outfile, " \"\"");
 289                 break;
 290
 291               case NOTE_INSN_PREDICTION:
 292                 if (NOTE_PREDICTION (in_rtx))
 293                   fprintf (outfile, " [ %d %d ] ",
 294                            (int)NOTE_PREDICTION_ALG (in_rtx),
 295                            (int) NOTE_PREDICTION_FLAGS (in_rtx));
 296                 else
 297                   fprintf (outfile, " [ ERROR ]");
 298                 break;
 299
 300               default:
 301                 {
 302                   const char * const str = X0STR (in_rtx, i);
 303
 304                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 305                     ;
 306                   else if (str == 0)
 307                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 308                   else
 309                     {
 310                       if (dump_for_graph)
 311                         fprintf (outfile, " (\\\"%s\\\")", str);
 312                       else
 313                         fprintf (outfile, " (\"%s\")", str);
 314                     }
 315                   break;
 316                 }
 317               }
 318           }
 319         break;
 320
 321       case 'e':
 322       do_e:
 323         indent += 2;
 324         if (!sawclose)
 325           fprintf (outfile, " ");
 326         print_rtx (XEXP (in_rtx, i));
 327         indent -= 2;
 328         break;
 329
 330       case 'E':
 331       case 'V':
 332         indent += 2;
 333         if (sawclose)
 334           {
 335             fprintf (outfile, "\n%s%*s",
 336                      print_rtx_head, indent * 2, "");
 337             sawclose = 0;
 338           }
 339         fputs (" [", outfile);
 340         if (NULL != XVEC (in_rtx, i))
 341           {
 342             indent += 2;
 343             if (XVECLEN (in_rtx, i))
 344               sawclose = 1;
 345
 346             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 347               print_rtx (XVECEXP (in_rtx, i, j));
 348
 349             indent -= 2;
 350           }
 351         if (sawclose)
 352           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 353
 354         fputs ("]", outfile);
 355         sawclose = 1;
 356         indent -= 2;
 357         break;
 358
 359       case 'w':
 360         if (! flag_simple)
 361           fprintf (outfile, " ");
 362         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 363         if (! flag_simple)
 364           {
 365             fprintf (outfile, " [");
 366             fprintf (outfile, HOST_WIDE_INT_PRINT_HEX, XWINT (in_rtx, i));
 367             fprintf (outfile, "]");
 368           }
 369         break;
 370
 371       case 'i':
 372         if (i == 6 && GET_CODE (in_rtx) == NOTE)
 373           {
 374             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 375                other times often contains garbage from INSN->NOTE death.  */
 376             if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
 377               fprintf (outfile, " %d",  XINT (in_rtx, i));
 378           }
 379         else
 380           {
 381             int value = XINT (in_rtx, i);
 382             const char *name;
 383
 384             if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 385               {
 386                 fputc (' ', outfile);
 387                 DEBUG_PRINT_REG (in_rtx, 0, outfile);
 388               }
 389             else if (GET_CODE (in_rtx) == REG
 390                      && value <= LAST_VIRTUAL_REGISTER)
 391               {
 392                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 393                   fprintf (outfile, " %d virtual-incoming-args", value);
 394                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 395                   fprintf (outfile, " %d virtual-stack-vars", value);
 396                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 397                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 398                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 399                   fprintf (outfile, " %d virtual-outgoing-args", value);
 400                 else if (value == VIRTUAL_CFA_REGNUM)
 401                   fprintf (outfile, " %d virtual-cfa", value);
 402                 else
 403                   fprintf (outfile, " %d virtual-reg-%d", value,
 404                            value-FIRST_VIRTUAL_REGISTER);
 405               }
 406             else if (flag_dump_unnumbered
 407                      && (is_insn || GET_CODE (in_rtx) == NOTE))
 408               fputc ('#', outfile);
 409             else
 410               fprintf (outfile, " %d", value);
 411
 412             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 413                 && XINT (in_rtx, i) >= 0
 414                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 415               fprintf (outfile, " {%s}", name);
 416             sawclose = 0;
 417           }
 418         break;
 419
 420       /* Print NOTE_INSN names rather than integer codes.  */
 421
 422       case 'n':
 423         if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
 424             && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
 425           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 426         else
 427           fprintf (outfile, " %d", XINT (in_rtx, i));
 428         sawclose = 0;
 429         break;
 430
 431       case 'u':
 432         if (XEXP (in_rtx, i) != NULL)
 433           {
 434             rtx sub = XEXP (in_rtx, i);
 435             enum rtx_code subc = GET_CODE (sub);
 436
 437             if (GET_CODE (in_rtx) == LABEL_REF)
 438               {
 439                 if (subc == NOTE
 440                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 441                   {
 442                     if (flag_dump_unnumbered)
 443                       fprintf (outfile, " [# deleted]");
 444                     else
 445                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 446                     sawclose = 0;
 447                     break;
 448                   }
 449
 450                 if (subc != CODE_LABEL)
 451                   goto do_e;
 452               }
 453
 454             if (flag_dump_unnumbered)
 455               fputs (" #", outfile);
 456             else
 457               fprintf (outfile, " %d", INSN_UID (sub));
 458           }
 459         else
 460           fputs (" 0", outfile);
 461         sawclose = 0;
 462         break;
 463
 464       case 'b':
 465         if (XBITMAP (in_rtx, i) == NULL)
 466           fputs (" {null}", outfile);
 467         else
 468           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 469         sawclose = 0;
 470         break;
 471
 472       case 't':
 473         putc (' ', outfile);
 474         fprintf (outfile, HOST_PTR_PRINTF, (char *) XTREE (in_rtx, i));
 475         break;
 476
 477       case '*':
 478         fputs (" Unknown", outfile);
 479         sawclose = 0;
 480         break;
 481
 482       case 'B':
 483         if (XBBDEF (in_rtx, i))
 484           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 485         break;
 486
 487       default:
 488         fprintf (stderr,
 489                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 490                  format_ptr[-1]);
 491         abort ();
 492       }
 493
 494   switch (GET_CODE (in_rtx))
 495     {
 496     case MEM:
 497       fputs (" [", outfile);
 498       fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 499
 500       if (MEM_EXPR (in_rtx))
 501         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 502
 503       if (MEM_OFFSET (in_rtx))
 504         {
 505           fputc ('+', outfile);
 506           fprintf (outfile, HOST_WIDE_INT_PRINT_DEC,
 507                    INTVAL (MEM_OFFSET (in_rtx)));
 508         }
 509
 510       if (MEM_SIZE (in_rtx))
 511         {
 512           fputs (" S", outfile);
 513           fprintf (outfile, HOST_WIDE_INT_PRINT_DEC,
 514                    INTVAL (MEM_SIZE (in_rtx)));
 515         }
 516
 517       if (MEM_ALIGN (in_rtx) != 1)
 518         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 519
 520       fputc (']', outfile);
 521       break;
 522
 523 #ifndef GENERATOR_FILE
 524     case CONST_DOUBLE:
 525       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 526         {
 527           char s[60];
 528
 529           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 530                            sizeof (s), 0, 1);
 531           fprintf (outfile, " %s", s);
 532
 533           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 534                                sizeof (s), 0, 1);
 535           fprintf (outfile, " [%s]", s);
 536         }
 537       break;
 538 #endif
 539
 540     case CODE_LABEL:
 541       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 542       switch (LABEL_KIND (in_rtx))
 543         {
 544           case LABEL_NORMAL: break;
 545           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 546           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 547           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 548           default: abort();
 549         }
 550       break;
 551
 552     case CALL_PLACEHOLDER:
 553       if (debug_call_placeholder_verbose)
 554         {
 555           fputs (" (cond [\n  (const_string \"normal\") (sequence [", outfile);
 556           for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 557             {
 558               fputs ("\n    ", outfile);
 559               print_inline_rtx (outfile, tem, 4);
 560             }
 561
 562           tem = XEXP (in_rtx, 1);
 563           if (tem)
 564             fputs ("\n    ])\n  (const_string \"tail_call\") (sequence [",
 565                    outfile);
 566           for (; tem != 0; tem = NEXT_INSN (tem))
 567             {
 568               fputs ("\n    ", outfile);
 569               print_inline_rtx (outfile, tem, 4);
 570             }
 571
 572           tem = XEXP (in_rtx, 2);
 573           if (tem)
 574             fputs ("\n    ])\n  (const_string \"tail_recursion\") (sequence [",
 575                    outfile);
 576           for (; tem != 0; tem = NEXT_INSN (tem))
 577             {
 578               fputs ("\n    ", outfile);
 579               print_inline_rtx (outfile, tem, 4);
 580             }
 581
 582           fputs ("\n    ])\n  ])", outfile);
 583           break;
 584         }
 585
 586       for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 587         if (GET_CODE (tem) == CALL_INSN)
 588           {
 589             fprintf (outfile, " ");
 590             print_rtx (tem);
 591             break;
 592           }
 593       break;
 594
 595     default:
 596       break;
 597     }
 598
 599   if (dump_for_graph
 600       && (is_insn || GET_CODE (in_rtx) == NOTE
 601           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 602     sawclose = 0;
 603   else
 604     {
 605       fputc (')', outfile);
 606       sawclose = 1;
 607     }
 608 }
 609
 610 /* Print an rtx on the current line of FILE.  Initially indent IND
 611    characters.  */
 612
 613 void
 614 print_inline_rtx (outf, x, ind)
 615      FILE *outf;
 616      rtx x;
 617      int ind;
 618 {
 619   int oldsaw = sawclose;
 620   int oldindent = indent;
 621
 622   sawclose = 0;
 623   indent = ind;
 624   outfile = outf;
 625   print_rtx (x);
 626   sawclose = oldsaw;
 627   indent = oldindent;
 628 }
 629
 630 /* Call this function from the debugger to see what X looks like.  */
 631
 632 void
 633 debug_rtx (x)
 634      rtx x;
 635 {
 636   outfile = stderr;
 637   sawclose = 0;
 638   print_rtx (x);
 639   fprintf (stderr, "\n");
 640 }
 641
 642 /* Count of rtx's to print with debug_rtx_list.
 643    This global exists because gdb user defined commands have no arguments.  */
 644
 645 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 646
 647 /* Call this function to print list from X on.
 648
 649    N is a count of the rtx's to print. Positive values print from the specified
 650    rtx on.  Negative values print a window around the rtx.
 651    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 652
 653 void
 654 debug_rtx_list (x, n)
 655      rtx x;
 656      int n;
 657 {
 658   int i,count;
 659   rtx insn;
 660
 661   count = n == 0 ? 1 : n < 0 ? -n : n;
 662
 663   /* If we are printing a window, back up to the start.  */
 664
 665   if (n < 0)
 666     for (i = count / 2; i > 0; i--)
 667       {
 668         if (PREV_INSN (x) == 0)
 669           break;
 670         x = PREV_INSN (x);
 671       }
 672
 673   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 674     {
 675       debug_rtx (insn);
 676       fprintf (stderr, "\n");
 677     }
 678 }
 679
 680 /* Call this function to print an rtx list from START to END inclusive.  */
 681
 682 void
 683 debug_rtx_range (start, end)
 684      rtx start, end;
 685 {
 686   while (1)
 687     {
 688       debug_rtx (start);
 689       fprintf (stderr, "\n");
 690       if (!start || start == end)
 691         break;
 692       start = NEXT_INSN (start);
 693     }
 694 }
 695
 696 /* Call this function to search an rtx list to find one with insn uid UID,
 697    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 698    The found insn is returned to enable further debugging analysis.  */
 699
 700 rtx
 701 debug_rtx_find (x, uid)
 702      rtx x;
 703      int uid;
 704 {
 705   while (x != 0 && INSN_UID (x) != uid)
 706     x = NEXT_INSN (x);
 707   if (x != 0)
 708     {
 709       debug_rtx_list (x, debug_rtx_count);
 710       return x;
 711     }
 712   else
 713     {
 714       fprintf (stderr, "insn uid %d not found\n", uid);
 715       return 0;
 716     }
 717 }
 718
 719 /* External entry point for printing a chain of insns
 720    starting with RTX_FIRST onto file OUTF.
 721    A blank line separates insns.
 722
 723    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 724
 725 void
 726 print_rtl (outf, rtx_first)
 727      FILE *outf;
 728      rtx rtx_first;
 729 {
 730   rtx tmp_rtx;
 731
 732   outfile = outf;
 733   sawclose = 0;
 734
 735   if (rtx_first == 0)
 736     {
 737       fputs (print_rtx_head, outf);
 738       fputs ("(nil)\n", outf);
 739     }
 740   else
 741     switch (GET_CODE (rtx_first))
 742       {
 743       case INSN:
 744       case JUMP_INSN:
 745       case CALL_INSN:
 746       case NOTE:
 747       case CODE_LABEL:
 748       case BARRIER:
 749         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 750           if (! flag_dump_unnumbered
 751               || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 752             {
 753               fputs (print_rtx_head, outfile);
 754               print_rtx (tmp_rtx);
 755               fprintf (outfile, "\n");
 756             }
 757         break;
 758
 759       default:
 760         fputs (print_rtx_head, outfile);
 761         print_rtx (rtx_first);
 762       }
 763 }
 764
 765 /* Like print_rtx, except specify a file.  */
 766 /* Return nonzero if we actually printed anything.  */
 767
 768 int
 769 print_rtl_single (outf, x)
 770      FILE *outf;
 771      rtx x;
 772 {
 773   outfile = outf;
 774   sawclose = 0;
 775   if (! flag_dump_unnumbered
 776       || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
 777     {
 778       fputs (print_rtx_head, outfile);
 779       print_rtx (x);
 780       putc ('\n', outf);
 781       return 1;
 782     }
 783   return 0;
 784 }
 785
 786
 787 /* Like print_rtl except without all the detail; for example,
 788    if RTX is a CONST_INT then print in decimal format.  */
 789
 790 void
 791 print_simple_rtl (outf, x)
 792      FILE *outf;
 793      rtx x;
 794 {
 795   flag_simple = 1;
 796   print_rtl (outf, x);
 797   flag_simple = 0;
 798 }