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, 2008, 2009, 2010
   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 "flags.h"
  40 #include "hard-reg-set.h"
  41 #include "basic-block.h"
  42 #include "diagnostic.h"
  43 #include "tree-pretty-print.h"
  44 #include "cselib.h"
  45 #include "tree-pass.h"
  46 #endif
  47
  48 static FILE *outfile;
  49
  50 static int sawclose = 0;
  51
  52 static int indent;
  53
  54 static void print_rtx (const_rtx);
  55
  56 /* String printed at beginning of each RTL when it is dumped.
  57    This string is set to ASM_COMMENT_START when the RTL is dumped in
  58    the assembly output file.  */
  59 const char *print_rtx_head = "";
  60
  61 /* Nonzero means suppress output of instruction numbers
  62    in debugging dumps.
  63    This must be defined here so that programs like gencodes can be linked.  */
  64 int flag_dump_unnumbered = 0;
  65
  66 /* Nonzero means suppress output of instruction numbers for previous
  67    and next insns in debugging dumps.
  68    This must be defined here so that programs like gencodes can be linked.  */
  69 int flag_dump_unnumbered_links = 0;
  70
  71 /* Nonzero means use simplified format without flags, modes, etc.  */
  72 int flag_simple = 0;
  73
  74 /* Nonzero if we are dumping graphical description.  */
  75 int dump_for_graph;
  76
  77 #ifndef GENERATOR_FILE
  78 void
  79 print_mem_expr (FILE *outfile, const_tree expr)
  80 {
  81   fputc (' ', outfile);
  82   print_generic_expr (outfile, CONST_CAST_TREE (expr), dump_flags);
  83 }
  84 #endif
  85
  86 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  87
  88 static void
  89 print_rtx (const_rtx in_rtx)
  90 {
  91   int i = 0;
  92   int j;
  93   const char *format_ptr;
  94   int is_insn;
  95
  96   if (sawclose)
  97     {
  98       if (flag_simple)
  99         fputc (' ', outfile);
 100       else
 101         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 102       sawclose = 0;
 103     }
 104
 105   if (in_rtx == 0)
 106     {
 107       fputs ("(nil)", outfile);
 108       sawclose = 1;
 109       return;
 110     }
 111   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 112     {
 113        fprintf (outfile, "(??? bad code %d\n%s%*s)", GET_CODE (in_rtx),
 114                 print_rtx_head, indent * 2, "");
 115        sawclose = 1;
 116        return;
 117     }
 118
 119   is_insn = INSN_P (in_rtx);
 120
 121   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 122      in separate nodes and therefore have to handle them special here.  */
 123   if (dump_for_graph
 124       && (is_insn || NOTE_P (in_rtx)
 125           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 126     {
 127       i = 3;
 128       indent = 0;
 129     }
 130   else
 131     {
 132       /* Print name of expression code.  */
 133       if (flag_simple && CONST_INT_P (in_rtx))
 134         fputc ('(', outfile);
 135       else
 136         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 137
 138       if (! flag_simple)
 139         {
 140           if (RTX_FLAG (in_rtx, in_struct))
 141             fputs ("/s", outfile);
 142
 143           if (RTX_FLAG (in_rtx, volatil))
 144             fputs ("/v", outfile);
 145
 146           if (RTX_FLAG (in_rtx, unchanging))
 147             fputs ("/u", outfile);
 148
 149           if (RTX_FLAG (in_rtx, frame_related))
 150             fputs ("/f", outfile);
 151
 152           if (RTX_FLAG (in_rtx, jump))
 153             fputs ("/j", outfile);
 154
 155           if (RTX_FLAG (in_rtx, call))
 156             fputs ("/c", outfile);
 157
 158           if (RTX_FLAG (in_rtx, return_val))
 159             fputs ("/i", outfile);
 160
 161           /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 162           if ((GET_CODE (in_rtx) == EXPR_LIST
 163                || GET_CODE (in_rtx) == INSN_LIST)
 164               && (int)GET_MODE (in_rtx) < REG_NOTE_MAX)
 165             fprintf (outfile, ":%s",
 166                      GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 167
 168           /* For other rtl, print the mode if it's not VOID.  */
 169           else if (GET_MODE (in_rtx) != VOIDmode)
 170             fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 171
 172 #ifndef GENERATOR_FILE
 173           if (GET_CODE (in_rtx) == VAR_LOCATION)
 174             {
 175               if (TREE_CODE (PAT_VAR_LOCATION_DECL (in_rtx)) == STRING_CST)
 176                 fputs (" <debug string placeholder>", outfile);
 177               else
 178                 print_mem_expr (outfile, PAT_VAR_LOCATION_DECL (in_rtx));
 179               fputc (' ', outfile);
 180               print_rtx (PAT_VAR_LOCATION_LOC (in_rtx));
 181               if (PAT_VAR_LOCATION_STATUS (in_rtx)
 182                   == VAR_INIT_STATUS_UNINITIALIZED)
 183                 fprintf (outfile, " [uninit]");
 184               sawclose = 1;
 185               i = GET_RTX_LENGTH (VAR_LOCATION);
 186             }
 187 #endif
 188         }
 189     }
 190
 191 #ifndef GENERATOR_FILE
 192   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 193     i = 5;
 194 #endif
 195
 196   /* Get the format string and skip the first elements if we have handled
 197      them already.  */
 198   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 199   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 200     switch (*format_ptr++)
 201       {
 202         const char *str;
 203
 204       case 'T':
 205         str = XTMPL (in_rtx, i);
 206         goto string;
 207
 208       case 'S':
 209       case 's':
 210         str = XSTR (in_rtx, i);
 211       string:
 212
 213         if (str == 0)
 214           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 215         else
 216           {
 217             if (dump_for_graph)
 218               fprintf (outfile, " (\\\"%s\\\")", str);
 219             else
 220               fprintf (outfile, " (\"%s\")", str);
 221           }
 222         sawclose = 1;
 223         break;
 224
 225         /* 0 indicates a field for internal use that should not be printed.
 226            An exception is the third field of a NOTE, where it indicates
 227            that the field has several different valid contents.  */
 228       case '0':
 229         if (i == 1 && REG_P (in_rtx))
 230           {
 231             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 232               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 233           }
 234 #ifndef GENERATOR_FILE
 235         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 236           {
 237             int flags = SYMBOL_REF_FLAGS (in_rtx);
 238             if (flags)
 239               fprintf (outfile, " [flags %#x]", flags);
 240           }
 241         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 242           {
 243             tree decl = SYMBOL_REF_DECL (in_rtx);
 244             if (decl)
 245               print_node_brief (outfile, "", decl, dump_flags);
 246           }
 247 #endif
 248         else if (i == 4 && NOTE_P (in_rtx))
 249           {
 250             switch (NOTE_KIND (in_rtx))
 251               {
 252               case NOTE_INSN_EH_REGION_BEG:
 253               case NOTE_INSN_EH_REGION_END:
 254                 if (flag_dump_unnumbered)
 255                   fprintf (outfile, " #");
 256                 else
 257                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 258                 sawclose = 1;
 259                 break;
 260
 261               case NOTE_INSN_BLOCK_BEG:
 262               case NOTE_INSN_BLOCK_END:
 263 #ifndef GENERATOR_FILE
 264                 dump_addr (outfile, " ", NOTE_BLOCK (in_rtx));
 265 #endif
 266                 sawclose = 1;
 267                 break;
 268
 269               case NOTE_INSN_BASIC_BLOCK:
 270                 {
 271 #ifndef GENERATOR_FILE
 272                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 273                   if (bb != 0)
 274                     fprintf (outfile, " [bb %d]", bb->index);
 275 #endif
 276                   break;
 277                 }
 278
 279               case NOTE_INSN_DELETED_LABEL:
 280                 {
 281                   const char *label = NOTE_DELETED_LABEL_NAME (in_rtx);
 282                   if (label)
 283                     fprintf (outfile, " (\"%s\")", label);
 284                   else
 285                     fprintf (outfile, " \"\"");
 286                 }
 287                 break;
 288
 289               case NOTE_INSN_SWITCH_TEXT_SECTIONS:
 290                 {
 291 #ifndef GENERATOR_FILE
 292                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 293                   if (bb != 0)
 294                     fprintf (outfile, " [bb %d]", bb->index);
 295 #endif
 296                   break;
 297                 }
 298
 299               case NOTE_INSN_VAR_LOCATION:
 300 #ifndef GENERATOR_FILE
 301                 fputc (' ', outfile);
 302                 print_rtx (NOTE_VAR_LOCATION (in_rtx));
 303 #endif
 304                 break;
 305
 306               default:
 307                 break;
 308               }
 309           }
 310         else if (i == 8 && JUMP_P (in_rtx) && JUMP_LABEL (in_rtx) != NULL)
 311           /* Output the JUMP_LABEL reference.  */
 312           fprintf (outfile, "\n%s%*s -> %d", print_rtx_head, indent * 2, "",
 313                    INSN_UID (JUMP_LABEL (in_rtx)));
 314         else if (i == 0 && GET_CODE (in_rtx) == VALUE)
 315           {
 316 #ifndef GENERATOR_FILE
 317             cselib_val *val = CSELIB_VAL_PTR (in_rtx);
 318
 319             fprintf (outfile, " %u:%u", val->uid, val->hash);
 320             dump_addr (outfile, " @", in_rtx);
 321             dump_addr (outfile, "/", (void*)val);
 322 #endif
 323           }
 324         else if (i == 0 && GET_CODE (in_rtx) == DEBUG_EXPR)
 325           {
 326 #ifndef GENERATOR_FILE
 327             fprintf (outfile, " D#%i",
 328                      DEBUG_TEMP_UID (DEBUG_EXPR_TREE_DECL (in_rtx)));
 329 #endif
 330           }
 331         break;
 332
 333       case 'e':
 334       do_e:
 335         indent += 2;
 336         if (!sawclose)
 337           fprintf (outfile, " ");
 338         print_rtx (XEXP (in_rtx, i));
 339         indent -= 2;
 340         break;
 341
 342       case 'E':
 343       case 'V':
 344         indent += 2;
 345         if (sawclose)
 346           {
 347             fprintf (outfile, "\n%s%*s",
 348                      print_rtx_head, indent * 2, "");
 349             sawclose = 0;
 350           }
 351         fputs (" [", outfile);
 352         if (NULL != XVEC (in_rtx, i))
 353           {
 354             indent += 2;
 355             if (XVECLEN (in_rtx, i))
 356               sawclose = 1;
 357
 358             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 359               print_rtx (XVECEXP (in_rtx, i, j));
 360
 361             indent -= 2;
 362           }
 363         if (sawclose)
 364           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 365
 366         fputs ("]", outfile);
 367         sawclose = 1;
 368         indent -= 2;
 369         break;
 370
 371       case 'w':
 372         if (! flag_simple)
 373           fprintf (outfile, " ");
 374         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 375         if (! flag_simple)
 376           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 377                    (unsigned HOST_WIDE_INT) XWINT (in_rtx, i));
 378         break;
 379
 380       case 'i':
 381         if (i == 4 && INSN_P (in_rtx))
 382           {
 383 #ifndef GENERATOR_FILE
 384             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 385                 redundant with line number information and do not print anything
 386                 when there is no location information available.  */
 387             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 388               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 389 #endif
 390           }
 391         else if (i == 6 && GET_CODE (in_rtx) == ASM_OPERANDS)
 392           {
 393 #ifndef GENERATOR_FILE
 394             fprintf (outfile, " %s:%i",
 395                      locator_file (ASM_OPERANDS_SOURCE_LOCATION (in_rtx)),
 396                      locator_line (ASM_OPERANDS_SOURCE_LOCATION (in_rtx)));
 397 #endif
 398           }
 399         else if (i == 1 && GET_CODE (in_rtx) == ASM_INPUT)
 400           {
 401 #ifndef GENERATOR_FILE
 402             fprintf (outfile, " %s:%i",
 403                      locator_file (ASM_INPUT_SOURCE_LOCATION (in_rtx)),
 404                      locator_line (ASM_INPUT_SOURCE_LOCATION (in_rtx)));
 405 #endif
 406           }
 407         else if (i == 6 && NOTE_P (in_rtx))
 408           {
 409             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 410                other times often contains garbage from INSN->NOTE death.  */
 411             if (NOTE_KIND (in_rtx) == NOTE_INSN_DELETED_LABEL)
 412               fprintf (outfile, " %d",  XINT (in_rtx, i));
 413           }
 414         else
 415           {
 416             int value = XINT (in_rtx, i);
 417             const char *name;
 418
 419 #ifndef GENERATOR_FILE
 420             if (REG_P (in_rtx) && value < FIRST_PSEUDO_REGISTER)
 421               fprintf (outfile, " %d %s", REGNO (in_rtx),
 422                        reg_names[REGNO (in_rtx)]);
 423             else if (REG_P (in_rtx)
 424                      && value <= LAST_VIRTUAL_REGISTER)
 425               {
 426                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 427                   fprintf (outfile, " %d virtual-incoming-args", value);
 428                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 429                   fprintf (outfile, " %d virtual-stack-vars", value);
 430                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 431                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 432                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 433                   fprintf (outfile, " %d virtual-outgoing-args", value);
 434                 else if (value == VIRTUAL_CFA_REGNUM)
 435                   fprintf (outfile, " %d virtual-cfa", value);
 436                 else
 437                   fprintf (outfile, " %d virtual-reg-%d", value,
 438                            value-FIRST_VIRTUAL_REGISTER);
 439               }
 440             else
 441 #endif
 442               if (flag_dump_unnumbered
 443                      && (is_insn || NOTE_P (in_rtx)))
 444               fputc ('#', outfile);
 445             else
 446               fprintf (outfile, " %d", value);
 447
 448 #ifndef GENERATOR_FILE
 449             if (REG_P (in_rtx) && REG_ATTRS (in_rtx))
 450               {
 451                 fputs (" [", outfile);
 452                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 453                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 454                 if (REG_EXPR (in_rtx))
 455                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 456
 457                 if (REG_OFFSET (in_rtx))
 458                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 459                            REG_OFFSET (in_rtx));
 460                 fputs (" ]", outfile);
 461               }
 462 #endif
 463
 464             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 465                 && XINT (in_rtx, i) >= 0
 466                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 467               fprintf (outfile, " {%s}", name);
 468             sawclose = 0;
 469           }
 470         break;
 471
 472       /* Print NOTE_INSN names rather than integer codes.  */
 473
 474       case 'n':
 475         fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 476         sawclose = 0;
 477         break;
 478
 479       case 'u':
 480         if (XEXP (in_rtx, i) != NULL)
 481           {
 482             rtx sub = XEXP (in_rtx, i);
 483             enum rtx_code subc = GET_CODE (sub);
 484
 485             if (GET_CODE (in_rtx) == LABEL_REF)
 486               {
 487                 if (subc == NOTE
 488                     && NOTE_KIND (sub) == NOTE_INSN_DELETED_LABEL)
 489                   {
 490                     if (flag_dump_unnumbered)
 491                       fprintf (outfile, " [# deleted]");
 492                     else
 493                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 494                     sawclose = 0;
 495                     break;
 496                   }
 497
 498                 if (subc != CODE_LABEL)
 499                   goto do_e;
 500               }
 501
 502             if (flag_dump_unnumbered
 503                 || (flag_dump_unnumbered_links && (i == 1 || i == 2)
 504                     && (INSN_P (in_rtx) || NOTE_P (in_rtx)
 505                         || LABEL_P (in_rtx) || BARRIER_P (in_rtx))))
 506               fputs (" #", outfile);
 507             else
 508               fprintf (outfile, " %d", INSN_UID (sub));
 509           }
 510         else
 511           fputs (" 0", outfile);
 512         sawclose = 0;
 513         break;
 514
 515       case 't':
 516 #ifndef GENERATOR_FILE
 517         dump_addr (outfile, " ", XTREE (in_rtx, i));
 518 #endif
 519         break;
 520
 521       case '*':
 522         fputs (" Unknown", outfile);
 523         sawclose = 0;
 524         break;
 525
 526       case 'B':
 527 #ifndef GENERATOR_FILE
 528         if (XBBDEF (in_rtx, i))
 529           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 530 #endif
 531         break;
 532
 533       default:
 534         gcc_unreachable ();
 535       }
 536
 537   switch (GET_CODE (in_rtx))
 538     {
 539 #ifndef GENERATOR_FILE
 540     case MEM:
 541       if (__builtin_expect (final_insns_dump_p, false))
 542         fprintf (outfile, " [");
 543       else
 544         fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC,
 545                  (HOST_WIDE_INT) MEM_ALIAS_SET (in_rtx));
 546
 547       if (MEM_EXPR (in_rtx))
 548         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 549
 550       if (MEM_OFFSET (in_rtx))
 551         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 552                  INTVAL (MEM_OFFSET (in_rtx)));
 553
 554       if (MEM_SIZE (in_rtx))
 555         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 556                  INTVAL (MEM_SIZE (in_rtx)));
 557
 558       if (MEM_ALIGN (in_rtx) != 1)
 559         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 560
 561       if (!ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (in_rtx)))
 562         fprintf (outfile, " AS%u", MEM_ADDR_SPACE (in_rtx));
 563
 564       fputc (']', outfile);
 565       break;
 566
 567     case CONST_DOUBLE:
 568       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 569         {
 570           char s[60];
 571
 572           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 573                            sizeof (s), 0, 1);
 574           fprintf (outfile, " %s", s);
 575
 576           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 577                                sizeof (s), 0, 1);
 578           fprintf (outfile, " [%s]", s);
 579         }
 580       break;
 581 #endif
 582
 583     case CODE_LABEL:
 584       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 585       switch (LABEL_KIND (in_rtx))
 586         {
 587           case LABEL_NORMAL: break;
 588           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 589           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 590           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 591           default: gcc_unreachable ();
 592         }
 593       break;
 594
 595     default:
 596       break;
 597     }
 598
 599   if (dump_for_graph
 600       && (is_insn || NOTE_P (in_rtx)
 601           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 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 (FILE *outf, const_rtx x, int ind)
 615 {
 616   int oldsaw = sawclose;
 617   int oldindent = indent;
 618
 619   sawclose = 0;
 620   indent = ind;
 621   outfile = outf;
 622   print_rtx (x);
 623   sawclose = oldsaw;
 624   indent = oldindent;
 625 }
 626
 627 /* Call this function from the debugger to see what X looks like.  */
 628
 629 void
 630 debug_rtx (const_rtx x)
 631 {
 632   outfile = stderr;
 633   sawclose = 0;
 634   print_rtx (x);
 635   fprintf (stderr, "\n");
 636 }
 637
 638 /* Count of rtx's to print with debug_rtx_list.
 639    This global exists because gdb user defined commands have no arguments.  */
 640
 641 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 642
 643 /* Call this function to print list from X on.
 644
 645    N is a count of the rtx's to print. Positive values print from the specified
 646    rtx on.  Negative values print a window around the rtx.
 647    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 648
 649 void
 650 debug_rtx_list (const_rtx x, int n)
 651 {
 652   int i,count;
 653   const_rtx insn;
 654
 655   count = n == 0 ? 1 : n < 0 ? -n : n;
 656
 657   /* If we are printing a window, back up to the start.  */
 658
 659   if (n < 0)
 660     for (i = count / 2; i > 0; i--)
 661       {
 662         if (PREV_INSN (x) == 0)
 663           break;
 664         x = PREV_INSN (x);
 665       }
 666
 667   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 668     {
 669       debug_rtx (insn);
 670       fprintf (stderr, "\n");
 671     }
 672 }
 673
 674 /* Call this function to print an rtx list from START to END inclusive.  */
 675
 676 void
 677 debug_rtx_range (const_rtx start, const_rtx end)
 678 {
 679   while (1)
 680     {
 681       debug_rtx (start);
 682       fprintf (stderr, "\n");
 683       if (!start || start == end)
 684         break;
 685       start = NEXT_INSN (start);
 686     }
 687 }
 688
 689 /* Call this function to search an rtx list to find one with insn uid UID,
 690    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 691    The found insn is returned to enable further debugging analysis.  */
 692
 693 const_rtx
 694 debug_rtx_find (const_rtx x, int uid)
 695 {
 696   while (x != 0 && INSN_UID (x) != uid)
 697     x = NEXT_INSN (x);
 698   if (x != 0)
 699     {
 700       debug_rtx_list (x, debug_rtx_count);
 701       return x;
 702     }
 703   else
 704     {
 705       fprintf (stderr, "insn uid %d not found\n", uid);
 706       return 0;
 707     }
 708 }
 709
 710 /* External entry point for printing a chain of insns
 711    starting with RTX_FIRST onto file OUTF.
 712    A blank line separates insns.
 713
 714    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 715
 716 void
 717 print_rtl (FILE *outf, const_rtx rtx_first)
 718 {
 719   const_rtx tmp_rtx;
 720
 721   outfile = outf;
 722   sawclose = 0;
 723
 724   if (rtx_first == 0)
 725     {
 726       fputs (print_rtx_head, outf);
 727       fputs ("(nil)\n", outf);
 728     }
 729   else
 730     switch (GET_CODE (rtx_first))
 731       {
 732       case INSN:
 733       case JUMP_INSN:
 734       case CALL_INSN:
 735       case NOTE:
 736       case CODE_LABEL:
 737       case BARRIER:
 738         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 739           {
 740             fputs (print_rtx_head, outfile);
 741             print_rtx (tmp_rtx);
 742             fprintf (outfile, "\n");
 743           }
 744         break;
 745
 746       default:
 747         fputs (print_rtx_head, outfile);
 748         print_rtx (rtx_first);
 749       }
 750 }
 751
 752 /* Like print_rtx, except specify a file.  */
 753 /* Return nonzero if we actually printed anything.  */
 754
 755 int
 756 print_rtl_single (FILE *outf, const_rtx x)
 757 {
 758   outfile = outf;
 759   sawclose = 0;
 760   fputs (print_rtx_head, outfile);
 761   print_rtx (x);
 762   putc ('\n', outf);
 763   return 1;
 764 }
 765
 766
 767 /* Like print_rtl except without all the detail; for example,
 768    if RTX is a CONST_INT then print in decimal format.  */
 769
 770 void
 771 print_simple_rtl (FILE *outf, const_rtx x)
 772 {
 773   flag_simple = 1;
 774   print_rtl (outf, x);
 775   flag_simple = 0;
 776 }