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