gcc/print-rtl.c

   1 /* Print RTL for GCC.
   2    Copyright (C) 1987, 1988, 1992, 1997, 1998, 1999, 2000, 2002, 2003,
   3    2004, 2005
   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 2, 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 COPYING.  If not, write to the Free
  20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA.  */
  22
  23 /* This file is compiled twice: once for the generator programs,
  24    once for the compiler.  */
  25 #ifdef GENERATOR_FILE
  26 #include "bconfig.h"
  27 #else
  28 #include "config.h"
  29 #endif
  30
  31 #include "system.h"
  32 #include "coretypes.h"
  33 #include "tm.h"
  34 #include "rtl.h"
  35
  36 /* These headers all define things which are not available in
  37    generator programs.  */
  38 #ifndef GENERATOR_FILE
  39 #include "tree.h"
  40 #include "real.h"
  41 #include "flags.h"
  42 #include "hard-reg-set.h"
  43 #include "basic-block.h"
  44 #endif
  45
  46 static FILE *outfile;
  47
  48 static int sawclose = 0;
  49
  50 static int indent;
  51
  52 static void print_rtx (rtx);
  53
  54 /* String printed at beginning of each RTL when it is dumped.
  55    This string is set to ASM_COMMENT_START when the RTL is dumped in
  56    the assembly output file.  */
  57 const char *print_rtx_head = "";
  58
  59 /* Nonzero means suppress output of instruction numbers and line number
  60    notes in debugging dumps.
  61    This must be defined here so that programs like gencodes can be linked.  */
  62 int flag_dump_unnumbered = 0;
  63
  64 /* Nonzero means use simplified format without flags, modes, etc.  */
  65 int flag_simple = 0;
  66
  67 /* Nonzero if we are dumping graphical description.  */
  68 int dump_for_graph;
  69
  70 #ifndef GENERATOR_FILE
  71 static void
  72 print_decl_name (FILE *outfile, tree node)
  73 {
  74   if (DECL_NAME (node))
  75     fputs (IDENTIFIER_POINTER (DECL_NAME (node)), outfile);
  76   else
  77     {
  78       if (TREE_CODE (node) == LABEL_DECL && LABEL_DECL_UID (node) != -1)
  79         fprintf (outfile, "L." HOST_WIDE_INT_PRINT_DEC, LABEL_DECL_UID (node));
  80       else
  81         {
  82           char c = TREE_CODE (node) == CONST_DECL ? 'C' : 'D';
  83           fprintf (outfile, "%c.%u", c, DECL_UID (node));
  84         }
  85     }
  86 }
  87
  88 void
  89 print_mem_expr (FILE *outfile, tree expr)
  90 {
  91   if (TREE_CODE (expr) == COMPONENT_REF)
  92     {
  93       if (TREE_OPERAND (expr, 0))
  94         print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  95       else
  96         fputs (" <variable>", outfile);
  97       fputc ('.', outfile);
  98       print_decl_name (outfile, TREE_OPERAND (expr, 1));
  99     }
 100   else if (TREE_CODE (expr) == INDIRECT_REF)
 101     {
 102       fputs (" (*", outfile);
 103       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 104       fputs (")", outfile);
 105     }
 106   else if (TREE_CODE (expr) == ALIGN_INDIRECT_REF)
 107     {
 108       fputs (" (A*", outfile);
 109       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 110       fputs (")", outfile);
 111     }
 112   else if (TREE_CODE (expr) == MISALIGNED_INDIRECT_REF)
 113     {
 114       fputs (" (M*", outfile);
 115       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 116       fputs (")", outfile);
 117     }
 118   else if (TREE_CODE (expr) == RESULT_DECL)
 119     fputs (" <result>", outfile);
 120   else
 121     {
 122       fputc (' ', outfile);
 123       print_decl_name (outfile, expr);
 124     }
 125 }
 126 #endif
 127
 128 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
 129
 130 static void
 131 print_rtx (rtx in_rtx)
 132 {
 133   int i = 0;
 134   int j;
 135   const char *format_ptr;
 136   int is_insn;
 137
 138   if (sawclose)
 139     {
 140       if (flag_simple)
 141         fputc (' ', outfile);
 142       else
 143         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 144       sawclose = 0;
 145     }
 146
 147   if (in_rtx == 0)
 148     {
 149       fputs ("(nil)", outfile);
 150       sawclose = 1;
 151       return;
 152     }
 153   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 154     {
 155        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 156        sawclose = 1;
 157        return;
 158     }
 159
 160   is_insn = INSN_P (in_rtx);
 161
 162   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 163      in separate nodes and therefore have to handle them special here.  */
 164   if (dump_for_graph
 165       && (is_insn || NOTE_P (in_rtx)
 166           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 167     {
 168       i = 3;
 169       indent = 0;
 170     }
 171   else
 172     {
 173       /* Print name of expression code.  */
 174       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 175         fputc ('(', outfile);
 176       else
 177         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 178
 179       if (! flag_simple)
 180         {
 181           if (RTX_FLAG (in_rtx, in_struct))
 182             fputs ("/s", outfile);
 183
 184           if (RTX_FLAG (in_rtx, volatil))
 185             fputs ("/v", outfile);
 186
 187           if (RTX_FLAG (in_rtx, unchanging))
 188             fputs ("/u", outfile);
 189
 190           if (RTX_FLAG (in_rtx, frame_related))
 191             fputs ("/f", outfile);
 192
 193           if (RTX_FLAG (in_rtx, jump))
 194             fputs ("/j", outfile);
 195
 196           if (RTX_FLAG (in_rtx, call))
 197             fputs ("/c", outfile);
 198
 199           if (RTX_FLAG (in_rtx, return_val))
 200             fputs ("/i", outfile);
 201
 202           /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 203           if (GET_CODE (in_rtx) == EXPR_LIST
 204               || GET_CODE (in_rtx) == INSN_LIST)
 205             fprintf (outfile, ":%s",
 206                      GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 207
 208           /* For other rtl, print the mode if it's not VOID.  */
 209           else if (GET_MODE (in_rtx) != VOIDmode)
 210             fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 211         }
 212     }
 213
 214 #ifndef GENERATOR_FILE
 215   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 216     i = 5;
 217 #endif
 218
 219   /* Get the format string and skip the first elements if we have handled
 220      them already.  */
 221   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 222   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 223     switch (*format_ptr++)
 224       {
 225         const char *str;
 226
 227       case 'T':
 228         str = XTMPL (in_rtx, i);
 229         goto string;
 230
 231       case 'S':
 232       case 's':
 233         str = XSTR (in_rtx, i);
 234       string:
 235
 236         if (str == 0)
 237           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 238         else
 239           {
 240             if (dump_for_graph)
 241               fprintf (outfile, " (\\\"%s\\\")", str);
 242             else
 243               fprintf (outfile, " (\"%s\")", str);
 244           }
 245         sawclose = 1;
 246         break;
 247
 248         /* 0 indicates a field for internal use that should not be printed.
 249            An exception is the third field of a NOTE, where it indicates
 250            that the field has several different valid contents.  */
 251       case '0':
 252         if (i == 1 && REG_P (in_rtx))
 253           {
 254             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 255               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 256           }
 257 #ifndef GENERATOR_FILE
 258         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 259           {
 260             int flags = SYMBOL_REF_FLAGS (in_rtx);
 261             if (flags)
 262               fprintf (outfile, " [flags 0x%x]", flags);
 263           }
 264         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 265           {
 266             tree decl = SYMBOL_REF_DECL (in_rtx);
 267             if (decl)
 268               print_node_brief (outfile, "", decl, 0);
 269           }
 270 #endif
 271         else if (i == 4 && NOTE_P (in_rtx))
 272           {
 273             switch (NOTE_LINE_NUMBER (in_rtx))
 274               {
 275               case NOTE_INSN_EH_REGION_BEG:
 276               case NOTE_INSN_EH_REGION_END:
 277                 if (flag_dump_unnumbered)
 278                   fprintf (outfile, " #");
 279                 else
 280                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 281                 sawclose = 1;
 282                 break;
 283
 284               case NOTE_INSN_BLOCK_BEG:
 285               case NOTE_INSN_BLOCK_END:
 286                 fprintf (outfile, " ");
 287                 if (flag_dump_unnumbered)
 288                   fprintf (outfile, "#");
 289                 else
 290                   fprintf (outfile, "%p",
 291                            (char *) NOTE_BLOCK (in_rtx));
 292                 sawclose = 1;
 293                 break;
 294
 295               case NOTE_INSN_BASIC_BLOCK:
 296                 {
 297 #ifndef GENERATOR_FILE
 298                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 299                   if (bb != 0)
 300                     fprintf (outfile, " [bb %d]", bb->index);
 301 #endif
 302                   break;
 303                 }
 304
 305               case NOTE_INSN_EXPECTED_VALUE:
 306                 indent += 2;
 307                 if (!sawclose)
 308                   fprintf (outfile, " ");
 309                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 310                 indent -= 2;
 311                 break;
 312
 313               case NOTE_INSN_DELETED_LABEL:
 314                 {
 315                   const char *label = NOTE_DELETED_LABEL_NAME (in_rtx);
 316                   if (label)
 317                     fprintf (outfile, " (\"%s\")", label);
 318                   else
 319                     fprintf (outfile, " \"\"");
 320                 }
 321                 break;
 322
 323               case NOTE_INSN_SWITCH_TEXT_SECTIONS:
 324                 {
 325 #ifndef GENERATOR_FILE
 326                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 327                   if (bb != 0)
 328                     fprintf (outfile, " [bb %d]", bb->index);
 329 #endif
 330                   break;
 331                 }
 332
 333               case NOTE_INSN_VAR_LOCATION:
 334 #ifndef GENERATOR_FILE
 335                 fprintf (outfile, " (");
 336                 print_mem_expr (outfile, NOTE_VAR_LOCATION_DECL (in_rtx));
 337                 fprintf (outfile, " ");
 338                 print_rtx (NOTE_VAR_LOCATION_LOC (in_rtx));
 339                 fprintf (outfile, ")");
 340 #endif
 341                 break;
 342
 343               default:
 344                 {
 345                   const char * const str = X0STR (in_rtx, i);
 346
 347                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 348                     ;
 349                   else if (str == 0)
 350                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 351                   else
 352                     {
 353                       if (dump_for_graph)
 354                         fprintf (outfile, " (\\\"%s\\\")", str);
 355                       else
 356                         fprintf (outfile, " (\"%s\")", str);
 357                     }
 358                   break;
 359                 }
 360               }
 361           }
 362         break;
 363
 364       case 'e':
 365       do_e:
 366         indent += 2;
 367         if (!sawclose)
 368           fprintf (outfile, " ");
 369         print_rtx (XEXP (in_rtx, i));
 370         indent -= 2;
 371         break;
 372
 373       case 'E':
 374       case 'V':
 375         indent += 2;
 376         if (sawclose)
 377           {
 378             fprintf (outfile, "\n%s%*s",
 379                      print_rtx_head, indent * 2, "");
 380             sawclose = 0;
 381           }
 382         fputs (" [", outfile);
 383         if (NULL != XVEC (in_rtx, i))
 384           {
 385             indent += 2;
 386             if (XVECLEN (in_rtx, i))
 387               sawclose = 1;
 388
 389             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 390               print_rtx (XVECEXP (in_rtx, i, j));
 391
 392             indent -= 2;
 393           }
 394         if (sawclose)
 395           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 396
 397         fputs ("]", outfile);
 398         sawclose = 1;
 399         indent -= 2;
 400         break;
 401
 402       case 'w':
 403         if (! flag_simple)
 404           fprintf (outfile, " ");
 405         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 406         if (! flag_simple)
 407           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 408                    XWINT (in_rtx, i));
 409         break;
 410
 411       case 'i':
 412         if (i == 4 && INSN_P (in_rtx))
 413           {
 414 #ifndef GENERATOR_FILE
 415             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 416                 redundant with line number information and do not print anything
 417                 when there is no location information available.  */
 418             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 419               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 420 #endif
 421           }
 422         else if (i == 6 && NOTE_P (in_rtx))
 423           {
 424             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 425                other times often contains garbage from INSN->NOTE death.  */
 426             if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
 427               fprintf (outfile, " %d",  XINT (in_rtx, i));
 428           }
 429         else
 430           {
 431             int value = XINT (in_rtx, i);
 432             const char *name;
 433
 434 #ifndef GENERATOR_FILE
 435             if (REG_P (in_rtx) && value < FIRST_PSEUDO_REGISTER)
 436               fprintf (outfile, " %d %s", REGNO (in_rtx),
 437                        reg_names[REGNO (in_rtx)]);
 438             else if (REG_P (in_rtx)
 439                      && value <= LAST_VIRTUAL_REGISTER)
 440               {
 441                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 442                   fprintf (outfile, " %d virtual-incoming-args", value);
 443                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 444                   fprintf (outfile, " %d virtual-stack-vars", value);
 445                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 446                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 447                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 448                   fprintf (outfile, " %d virtual-outgoing-args", value);
 449                 else if (value == VIRTUAL_CFA_REGNUM)
 450                   fprintf (outfile, " %d virtual-cfa", value);
 451                 else
 452                   fprintf (outfile, " %d virtual-reg-%d", value,
 453                            value-FIRST_VIRTUAL_REGISTER);
 454               }
 455             else
 456 #endif
 457               if (flag_dump_unnumbered
 458                      && (is_insn || NOTE_P (in_rtx)))
 459               fputc ('#', outfile);
 460             else
 461               fprintf (outfile, " %d", value);
 462
 463 #ifndef GENERATOR_FILE
 464             if (REG_P (in_rtx) && REG_ATTRS (in_rtx))
 465               {
 466                 fputs (" [", outfile);
 467                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 468                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 469                 if (REG_EXPR (in_rtx))
 470                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 471
 472                 if (REG_OFFSET (in_rtx))
 473                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 474                            REG_OFFSET (in_rtx));
 475                 fputs (" ]", outfile);
 476               }
 477 #endif
 478
 479             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 480                 && XINT (in_rtx, i) >= 0
 481                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 482               fprintf (outfile, " {%s}", name);
 483             sawclose = 0;
 484           }
 485         break;
 486
 487       /* Print NOTE_INSN names rather than integer codes.  */
 488
 489       case 'n':
 490         if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
 491             && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
 492           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 493         else
 494           fprintf (outfile, " %d", XINT (in_rtx, i));
 495         sawclose = 0;
 496         break;
 497
 498       case 'u':
 499         if (XEXP (in_rtx, i) != NULL)
 500           {
 501             rtx sub = XEXP (in_rtx, i);
 502             enum rtx_code subc = GET_CODE (sub);
 503
 504             if (GET_CODE (in_rtx) == LABEL_REF)
 505               {
 506                 if (subc == NOTE
 507                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 508                   {
 509                     if (flag_dump_unnumbered)
 510                       fprintf (outfile, " [# deleted]");
 511                     else
 512                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 513                     sawclose = 0;
 514                     break;
 515                   }
 516
 517                 if (subc != CODE_LABEL)
 518                   goto do_e;
 519               }
 520
 521             if (flag_dump_unnumbered)
 522               fputs (" #", outfile);
 523             else
 524               fprintf (outfile, " %d", INSN_UID (sub));
 525           }
 526         else
 527           fputs (" 0", outfile);
 528         sawclose = 0;
 529         break;
 530
 531       case 'b':
 532 #ifndef GENERATOR_FILE
 533         if (XBITMAP (in_rtx, i) == NULL)
 534           fputs (" {null}", outfile);
 535         else
 536           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 537 #endif
 538         sawclose = 0;
 539         break;
 540
 541       case 't':
 542         fprintf (outfile, " %p", (void *) XTREE (in_rtx, i));
 543         break;
 544
 545       case '*':
 546         fputs (" Unknown", outfile);
 547         sawclose = 0;
 548         break;
 549
 550       case 'B':
 551 #ifndef GENERATOR_FILE
 552         if (XBBDEF (in_rtx, i))
 553           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 554 #endif
 555         break;
 556
 557       default:
 558         gcc_unreachable ();
 559       }
 560
 561   switch (GET_CODE (in_rtx))
 562     {
 563 #ifndef GENERATOR_FILE
 564     case MEM:
 565       fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 566
 567       if (MEM_EXPR (in_rtx))
 568         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 569
 570       if (MEM_OFFSET (in_rtx))
 571         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 572                  INTVAL (MEM_OFFSET (in_rtx)));
 573
 574       if (MEM_SIZE (in_rtx))
 575         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 576                  INTVAL (MEM_SIZE (in_rtx)));
 577
 578       if (MEM_ALIGN (in_rtx) != 1)
 579         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 580
 581       fputc (']', outfile);
 582       break;
 583
 584     case CONST_DOUBLE:
 585       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 586         {
 587           char s[60];
 588
 589           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 590                            sizeof (s), 0, 1);
 591           fprintf (outfile, " %s", s);
 592
 593           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 594                                sizeof (s), 0, 1);
 595           fprintf (outfile, " [%s]", s);
 596         }
 597       break;
 598 #endif
 599
 600     case CODE_LABEL:
 601       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 602       switch (LABEL_KIND (in_rtx))
 603         {
 604           case LABEL_NORMAL: break;
 605           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 606           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 607           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 608           default: gcc_unreachable ();
 609         }
 610       break;
 611
 612     default:
 613       break;
 614     }
 615
 616   if (dump_for_graph
 617       && (is_insn || NOTE_P (in_rtx)
 618           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 619     sawclose = 0;
 620   else
 621     {
 622       fputc (')', outfile);
 623       sawclose = 1;
 624     }
 625 }
 626
 627 /* Print an rtx on the current line of FILE.  Initially indent IND
 628    characters.  */
 629
 630 void
 631 print_inline_rtx (FILE *outf, rtx x, int ind)
 632 {
 633   int oldsaw = sawclose;
 634   int oldindent = indent;
 635
 636   sawclose = 0;
 637   indent = ind;
 638   outfile = outf;
 639   print_rtx (x);
 640   sawclose = oldsaw;
 641   indent = oldindent;
 642 }
 643
 644 /* Call this function from the debugger to see what X looks like.  */
 645
 646 void
 647 debug_rtx (rtx x)
 648 {
 649   outfile = stderr;
 650   sawclose = 0;
 651   print_rtx (x);
 652   fprintf (stderr, "\n");
 653 }
 654
 655 /* Count of rtx's to print with debug_rtx_list.
 656    This global exists because gdb user defined commands have no arguments.  */
 657
 658 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 659
 660 /* Call this function to print list from X on.
 661
 662    N is a count of the rtx's to print. Positive values print from the specified
 663    rtx on.  Negative values print a window around the rtx.
 664    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 665
 666 void
 667 debug_rtx_list (rtx x, int n)
 668 {
 669   int i,count;
 670   rtx insn;
 671
 672   count = n == 0 ? 1 : n < 0 ? -n : n;
 673
 674   /* If we are printing a window, back up to the start.  */
 675
 676   if (n < 0)
 677     for (i = count / 2; i > 0; i--)
 678       {
 679         if (PREV_INSN (x) == 0)
 680           break;
 681         x = PREV_INSN (x);
 682       }
 683
 684   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 685     {
 686       debug_rtx (insn);
 687       fprintf (stderr, "\n");
 688     }
 689 }
 690
 691 /* Call this function to print an rtx list from START to END inclusive.  */
 692
 693 void
 694 debug_rtx_range (rtx start, rtx end)
 695 {
 696   while (1)
 697     {
 698       debug_rtx (start);
 699       fprintf (stderr, "\n");
 700       if (!start || start == end)
 701         break;
 702       start = NEXT_INSN (start);
 703     }
 704 }
 705
 706 /* Call this function to search an rtx list to find one with insn uid UID,
 707    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 708    The found insn is returned to enable further debugging analysis.  */
 709
 710 rtx
 711 debug_rtx_find (rtx x, int uid)
 712 {
 713   while (x != 0 && INSN_UID (x) != uid)
 714     x = NEXT_INSN (x);
 715   if (x != 0)
 716     {
 717       debug_rtx_list (x, debug_rtx_count);
 718       return x;
 719     }
 720   else
 721     {
 722       fprintf (stderr, "insn uid %d not found\n", uid);
 723       return 0;
 724     }
 725 }
 726
 727 /* External entry point for printing a chain of insns
 728    starting with RTX_FIRST onto file OUTF.
 729    A blank line separates insns.
 730
 731    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 732
 733 void
 734 print_rtl (FILE *outf, rtx rtx_first)
 735 {
 736   rtx tmp_rtx;
 737
 738   outfile = outf;
 739   sawclose = 0;
 740
 741   if (rtx_first == 0)
 742     {
 743       fputs (print_rtx_head, outf);
 744       fputs ("(nil)\n", outf);
 745     }
 746   else
 747     switch (GET_CODE (rtx_first))
 748       {
 749       case INSN:
 750       case JUMP_INSN:
 751       case CALL_INSN:
 752       case NOTE:
 753       case CODE_LABEL:
 754       case BARRIER:
 755         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 756           if (! flag_dump_unnumbered
 757               || !NOTE_P (tmp_rtx) || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 758             {
 759               fputs (print_rtx_head, outfile);
 760               print_rtx (tmp_rtx);
 761               fprintf (outfile, "\n");
 762             }
 763         break;
 764
 765       default:
 766         fputs (print_rtx_head, outfile);
 767         print_rtx (rtx_first);
 768       }
 769 }
 770
 771 /* Like print_rtx, except specify a file.  */
 772 /* Return nonzero if we actually printed anything.  */
 773
 774 int
 775 print_rtl_single (FILE *outf, rtx x)
 776 {
 777   outfile = outf;
 778   sawclose = 0;
 779   if (! flag_dump_unnumbered
 780       || !NOTE_P (x) || NOTE_LINE_NUMBER (x) < 0)
 781     {
 782       fputs (print_rtx_head, outfile);
 783       print_rtx (x);
 784       putc ('\n', outf);
 785       return 1;
 786     }
 787   return 0;
 788 }
 789
 790
 791 /* Like print_rtl except without all the detail; for example,
 792    if RTX is a CONST_INT then print in decimal format.  */
 793
 794 void
 795 print_simple_rtl (FILE *outf, rtx x)
 796 {
 797   flag_simple = 1;
 798   print_rtl (outf, x);
 799   flag_simple = 0;
 800 }