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
   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 #include "diagnostic.h"
  44 #include "cselib.h"
  45 #endif
  46
  47 static FILE *outfile;
  48
  49 static int sawclose = 0;
  50
  51 static int indent;
  52
  53 static void print_rtx (const_rtx);
  54
  55 /* String printed at beginning of each RTL when it is dumped.
  56    This string is set to ASM_COMMENT_START when the RTL is dumped in
  57    the assembly output file.  */
  58 const char *print_rtx_head = "";
  59
  60 /* Nonzero means suppress output of instruction numbers
  61    in debugging dumps.
  62    This must be defined here so that programs like gencodes can be linked.  */
  63 int flag_dump_unnumbered = 0;
  64
  65 /* Nonzero means suppress output of instruction numbers for previous
  66    and next insns in debugging dumps.
  67    This must be defined here so that programs like gencodes can be linked.  */
  68 int flag_dump_unnumbered_links = 0;
  69
  70 /* Nonzero means use simplified format without flags, modes, etc.  */
  71 int flag_simple = 0;
  72
  73 /* Nonzero if we are dumping graphical description.  */
  74 int dump_for_graph;
  75
  76 #ifndef GENERATOR_FILE
  77 void
  78 print_mem_expr (FILE *outfile, const_tree expr)
  79 {
  80   fputc (' ', outfile);
  81   print_generic_expr (outfile, CONST_CAST_TREE (expr), 0);
  82 }
  83 #endif
  84
  85 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  86
  87 static void
  88 print_rtx (const_rtx in_rtx)
  89 {
  90   int i = 0;
  91   int j;
  92   const char *format_ptr;
  93   int is_insn;
  94
  95   if (sawclose)
  96     {
  97       if (flag_simple)
  98         fputc (' ', outfile);
  99       else
 100         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 101       sawclose = 0;
 102     }
 103
 104   if (in_rtx == 0)
 105     {
 106       fputs ("(nil)", outfile);
 107       sawclose = 1;
 108       return;
 109     }
 110   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 111     {
 112        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 113        sawclose = 1;
 114        return;
 115     }
 116
 117   is_insn = INSN_P (in_rtx);
 118
 119   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 120      in separate nodes and therefore have to handle them special here.  */
 121   if (dump_for_graph
 122       && (is_insn || NOTE_P (in_rtx)
 123           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 124     {
 125       i = 3;
 126       indent = 0;
 127     }
 128   else
 129     {
 130       /* Print name of expression code.  */
 131       if (flag_simple && CONST_INT_P (in_rtx))
 132         fputc ('(', outfile);
 133       else
 134         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 135
 136       if (! flag_simple)
 137         {
 138           if (RTX_FLAG (in_rtx, in_struct))
 139             fputs ("/s", outfile);
 140
 141           if (RTX_FLAG (in_rtx, volatil))
 142             fputs ("/v", outfile);
 143
 144           if (RTX_FLAG (in_rtx, unchanging))
 145             fputs ("/u", outfile);
 146
 147           if (RTX_FLAG (in_rtx, frame_related))
 148             fputs ("/f", outfile);
 149
 150           if (RTX_FLAG (in_rtx, jump))
 151             fputs ("/j", outfile);
 152
 153           if (RTX_FLAG (in_rtx, call))
 154             fputs ("/c", outfile);
 155
 156           if (RTX_FLAG (in_rtx, return_val))
 157             fputs ("/i", outfile);
 158
 159           /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 160           if ((GET_CODE (in_rtx) == EXPR_LIST
 161                || GET_CODE (in_rtx) == INSN_LIST)
 162               && (int)GET_MODE (in_rtx) < REG_NOTE_MAX)
 163             fprintf (outfile, ":%s",
 164                      GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 165
 166           /* For other rtl, print the mode if it's not VOID.  */
 167           else if (GET_MODE (in_rtx) != VOIDmode)
 168             fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 169
 170 #ifndef GENERATOR_FILE
 171           if (GET_CODE (in_rtx) == VAR_LOCATION)
 172             {
 173               if (TREE_CODE (PAT_VAR_LOCATION_DECL (in_rtx)) == STRING_CST)
 174                 fputs (" <debug string placeholder>", outfile);
 175               else
 176                 print_mem_expr (outfile, PAT_VAR_LOCATION_DECL (in_rtx));
 177               fputc (' ', outfile);
 178               print_rtx (PAT_VAR_LOCATION_LOC (in_rtx));
 179               if (PAT_VAR_LOCATION_STATUS (in_rtx)
 180                   == VAR_INIT_STATUS_UNINITIALIZED)
 181                 fprintf (outfile, " [uninit]");
 182               sawclose = 1;
 183               i = GET_RTX_LENGTH (VAR_LOCATION);
 184             }
 185 #endif
 186         }
 187     }
 188
 189 #ifndef GENERATOR_FILE
 190   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 191     i = 5;
 192 #endif
 193
 194   /* Get the format string and skip the first elements if we have handled
 195      them already.  */
 196   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 197   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 198     switch (*format_ptr++)
 199       {
 200         const char *str;
 201
 202       case 'T':
 203         str = XTMPL (in_rtx, i);
 204         goto string;
 205
 206       case 'S':
 207       case 's':
 208         str = XSTR (in_rtx, i);
 209       string:
 210
 211         if (str == 0)
 212           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 213         else
 214           {
 215             if (dump_for_graph)
 216               fprintf (outfile, " (\\\"%s\\\")", str);
 217             else
 218               fprintf (outfile, " (\"%s\")", str);
 219           }
 220         sawclose = 1;
 221         break;
 222
 223         /* 0 indicates a field for internal use that should not be printed.
 224            An exception is the third field of a NOTE, where it indicates
 225            that the field has several different valid contents.  */
 226       case '0':
 227         if (i == 1 && REG_P (in_rtx))
 228           {
 229             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 230               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 231           }
 232 #ifndef GENERATOR_FILE
 233         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 234           {
 235             int flags = SYMBOL_REF_FLAGS (in_rtx);
 236             if (flags)
 237               fprintf (outfile, " [flags 0x%x]", flags);
 238           }
 239         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 240           {
 241             tree decl = SYMBOL_REF_DECL (in_rtx);
 242             if (decl)
 243               print_node_brief (outfile, "", decl, 0);
 244           }
 245 #endif
 246         else if (i == 4 && NOTE_P (in_rtx))
 247           {
 248             switch (NOTE_KIND (in_rtx))
 249               {
 250               case NOTE_INSN_EH_REGION_BEG:
 251               case NOTE_INSN_EH_REGION_END:
 252                 if (flag_dump_unnumbered)
 253                   fprintf (outfile, " #");
 254                 else
 255                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 256                 sawclose = 1;
 257                 break;
 258
 259               case NOTE_INSN_BLOCK_BEG:
 260               case NOTE_INSN_BLOCK_END:
 261 #ifndef GENERATOR_FILE
 262                 dump_addr (outfile, " ", NOTE_BLOCK (in_rtx));
 263 #endif
 264                 sawclose = 1;
 265                 break;
 266
 267               case NOTE_INSN_BASIC_BLOCK:
 268                 {
 269 #ifndef GENERATOR_FILE
 270                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 271                   if (bb != 0)
 272                     fprintf (outfile, " [bb %d]", bb->index);
 273 #endif
 274                   break;
 275                 }
 276
 277               case NOTE_INSN_DELETED_LABEL:
 278                 {
 279                   const char *label = NOTE_DELETED_LABEL_NAME (in_rtx);
 280                   if (label)
 281                     fprintf (outfile, " (\"%s\")", label);
 282                   else
 283                     fprintf (outfile, " \"\"");
 284                 }
 285                 break;
 286
 287               case NOTE_INSN_SWITCH_TEXT_SECTIONS:
 288                 {
 289 #ifndef GENERATOR_FILE
 290                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 291                   if (bb != 0)
 292                     fprintf (outfile, " [bb %d]", bb->index);
 293 #endif
 294                   break;
 295                 }
 296
 297               case NOTE_INSN_VAR_LOCATION:
 298 #ifndef GENERATOR_FILE
 299                 fputc (' ', outfile);
 300                 print_rtx (NOTE_VAR_LOCATION (in_rtx));
 301 #endif
 302                 break;
 303
 304               default:
 305                 break;
 306               }
 307           }
 308         else if (i == 8 && JUMP_P (in_rtx) && JUMP_LABEL (in_rtx) != NULL)
 309           /* Output the JUMP_LABEL reference.  */
 310           fprintf (outfile, "\n -> %d", INSN_UID (JUMP_LABEL (in_rtx)));
 311         else if (i == 0 && GET_CODE (in_rtx) == VALUE)
 312           {
 313 #ifndef GENERATOR_FILE
 314             cselib_val *val = CSELIB_VAL_PTR (in_rtx);
 315
 316             fprintf (outfile, " %i", val->value);
 317             dump_addr (outfile, " @", in_rtx);
 318             dump_addr (outfile, "/", (void*)val);
 319 #endif
 320           }
 321         else if (i == 0 && GET_CODE (in_rtx) == DEBUG_EXPR)
 322           {
 323 #ifndef GENERATOR_FILE
 324             fprintf (outfile, " D#%i",
 325                      DEBUG_TEMP_UID (DEBUG_EXPR_TREE_DECL (in_rtx)));
 326 #endif
 327           }
 328         break;
 329
 330       case 'e':
 331       do_e:
 332         indent += 2;
 333         if (!sawclose)
 334           fprintf (outfile, " ");
 335         print_rtx (XEXP (in_rtx, i));
 336         indent -= 2;
 337         break;
 338
 339       case 'E':
 340       case 'V':
 341         indent += 2;
 342         if (sawclose)
 343           {
 344             fprintf (outfile, "\n%s%*s",
 345                      print_rtx_head, indent * 2, "");
 346             sawclose = 0;
 347           }
 348         fputs (" [", outfile);
 349         if (NULL != XVEC (in_rtx, i))
 350           {
 351             indent += 2;
 352             if (XVECLEN (in_rtx, i))
 353               sawclose = 1;
 354
 355             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 356               print_rtx (XVECEXP (in_rtx, i, j));
 357
 358             indent -= 2;
 359           }
 360         if (sawclose)
 361           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 362
 363         fputs ("]", outfile);
 364         sawclose = 1;
 365         indent -= 2;
 366         break;
 367
 368       case 'w':
 369         if (! flag_simple)
 370           fprintf (outfile, " ");
 371         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 372         if (! flag_simple)
 373           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 374                    (unsigned HOST_WIDE_INT) XWINT (in_rtx, i));
 375         break;
 376
 377       case 'i':
 378         if (i == 4 && INSN_P (in_rtx))
 379           {
 380 #ifndef GENERATOR_FILE
 381             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 382                 redundant with line number information and do not print anything
 383                 when there is no location information available.  */
 384             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 385               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 386 #endif
 387           }
 388         else if (i == 6 && GET_CODE (in_rtx) == ASM_OPERANDS)
 389           {
 390 #ifndef GENERATOR_FILE
 391             fprintf (outfile, " %s:%i",
 392                      locator_file (ASM_OPERANDS_SOURCE_LOCATION (in_rtx)),
 393                      locator_line (ASM_OPERANDS_SOURCE_LOCATION (in_rtx)));
 394 #endif
 395           }
 396         else if (i == 1 && GET_CODE (in_rtx) == ASM_INPUT)
 397           {
 398 #ifndef GENERATOR_FILE
 399             fprintf (outfile, " %s:%i",
 400                      locator_file (ASM_INPUT_SOURCE_LOCATION (in_rtx)),
 401                      locator_line (ASM_INPUT_SOURCE_LOCATION (in_rtx)));
 402 #endif
 403           }
 404         else if (i == 6 && NOTE_P (in_rtx))
 405           {
 406             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 407                other times often contains garbage from INSN->NOTE death.  */
 408             if (NOTE_KIND (in_rtx) == NOTE_INSN_DELETED_LABEL)
 409               fprintf (outfile, " %d",  XINT (in_rtx, i));
 410           }
 411         else
 412           {
 413             int value = XINT (in_rtx, i);
 414             const char *name;
 415
 416 #ifndef GENERATOR_FILE
 417             if (REG_P (in_rtx) && value < FIRST_PSEUDO_REGISTER)
 418               fprintf (outfile, " %d %s", REGNO (in_rtx),
 419                        reg_names[REGNO (in_rtx)]);
 420             else if (REG_P (in_rtx)
 421                      && value <= LAST_VIRTUAL_REGISTER)
 422               {
 423                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 424                   fprintf (outfile, " %d virtual-incoming-args", value);
 425                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 426                   fprintf (outfile, " %d virtual-stack-vars", value);
 427                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 428                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 429                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 430                   fprintf (outfile, " %d virtual-outgoing-args", value);
 431                 else if (value == VIRTUAL_CFA_REGNUM)
 432                   fprintf (outfile, " %d virtual-cfa", value);
 433                 else
 434                   fprintf (outfile, " %d virtual-reg-%d", value,
 435                            value-FIRST_VIRTUAL_REGISTER);
 436               }
 437             else
 438 #endif
 439               if (flag_dump_unnumbered
 440                      && (is_insn || NOTE_P (in_rtx)))
 441               fputc ('#', outfile);
 442             else
 443               fprintf (outfile, " %d", value);
 444
 445 #ifndef GENERATOR_FILE
 446             if (REG_P (in_rtx) && REG_ATTRS (in_rtx))
 447               {
 448                 fputs (" [", outfile);
 449                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 450                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 451                 if (REG_EXPR (in_rtx))
 452                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 453
 454                 if (REG_OFFSET (in_rtx))
 455                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 456                            REG_OFFSET (in_rtx));
 457                 fputs (" ]", outfile);
 458               }
 459 #endif
 460
 461             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 462                 && XINT (in_rtx, i) >= 0
 463                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 464               fprintf (outfile, " {%s}", name);
 465             sawclose = 0;
 466           }
 467         break;
 468
 469       /* Print NOTE_INSN names rather than integer codes.  */
 470
 471       case 'n':
 472         fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 473         sawclose = 0;
 474         break;
 475
 476       case 'u':
 477         if (XEXP (in_rtx, i) != NULL)
 478           {
 479             rtx sub = XEXP (in_rtx, i);
 480             enum rtx_code subc = GET_CODE (sub);
 481
 482             if (GET_CODE (in_rtx) == LABEL_REF)
 483               {
 484                 if (subc == NOTE
 485                     && NOTE_KIND (sub) == NOTE_INSN_DELETED_LABEL)
 486                   {
 487                     if (flag_dump_unnumbered)
 488                       fprintf (outfile, " [# deleted]");
 489                     else
 490                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 491                     sawclose = 0;
 492                     break;
 493                   }
 494
 495                 if (subc != CODE_LABEL)
 496                   goto do_e;
 497               }
 498
 499             if (flag_dump_unnumbered
 500                 || (flag_dump_unnumbered_links && (i == 1 || i == 2)
 501                     && (INSN_P (in_rtx) || NOTE_P (in_rtx)
 502                         || LABEL_P (in_rtx) || BARRIER_P (in_rtx))))
 503               fputs (" #", outfile);
 504             else
 505               fprintf (outfile, " %d", INSN_UID (sub));
 506           }
 507         else
 508           fputs (" 0", outfile);
 509         sawclose = 0;
 510         break;
 511
 512       case 'b':
 513 #ifndef GENERATOR_FILE
 514         if (XBITMAP (in_rtx, i) == NULL)
 515           fputs (" {null}", outfile);
 516         else
 517           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 518 #endif
 519         sawclose = 0;
 520         break;
 521
 522       case 't':
 523 #ifndef GENERATOR_FILE
 524         dump_addr (outfile, " ", XTREE (in_rtx, i));
 525 #endif
 526         break;
 527
 528       case '*':
 529         fputs (" Unknown", outfile);
 530         sawclose = 0;
 531         break;
 532
 533       case 'B':
 534 #ifndef GENERATOR_FILE
 535         if (XBBDEF (in_rtx, i))
 536           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 537 #endif
 538         break;
 539
 540       default:
 541         gcc_unreachable ();
 542       }
 543
 544   switch (GET_CODE (in_rtx))
 545     {
 546 #ifndef GENERATOR_FILE
 547     case MEM:
 548       fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC,
 549                (HOST_WIDE_INT) MEM_ALIAS_SET (in_rtx));
 550
 551       if (MEM_EXPR (in_rtx))
 552         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 553
 554       if (MEM_OFFSET (in_rtx))
 555         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 556                  INTVAL (MEM_OFFSET (in_rtx)));
 557
 558       if (MEM_SIZE (in_rtx))
 559         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 560                  INTVAL (MEM_SIZE (in_rtx)));
 561
 562       if (MEM_ALIGN (in_rtx) != 1)
 563         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 564
 565       if (!ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (in_rtx)))
 566         fprintf (outfile, " AS%u", MEM_ADDR_SPACE (in_rtx));
 567
 568       fputc (']', outfile);
 569       break;
 570
 571     case CONST_DOUBLE:
 572       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 573         {
 574           char s[60];
 575
 576           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 577                            sizeof (s), 0, 1);
 578           fprintf (outfile, " %s", s);
 579
 580           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 581                                sizeof (s), 0, 1);
 582           fprintf (outfile, " [%s]", s);
 583         }
 584       break;
 585 #endif
 586
 587     case CODE_LABEL:
 588       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 589       switch (LABEL_KIND (in_rtx))
 590         {
 591           case LABEL_NORMAL: break;
 592           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 593           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 594           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 595           default: gcc_unreachable ();
 596         }
 597       break;
 598
 599     default:
 600       break;
 601     }
 602
 603   if (dump_for_graph
 604       && (is_insn || NOTE_P (in_rtx)
 605           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 606     sawclose = 0;
 607   else
 608     {
 609       fputc (')', outfile);
 610       sawclose = 1;
 611     }
 612 }
 613
 614 /* Print an rtx on the current line of FILE.  Initially indent IND
 615    characters.  */
 616
 617 void
 618 print_inline_rtx (FILE *outf, const_rtx x, int ind)
 619 {
 620   int oldsaw = sawclose;
 621   int oldindent = indent;
 622
 623   sawclose = 0;
 624   indent = ind;
 625   outfile = outf;
 626   print_rtx (x);
 627   sawclose = oldsaw;
 628   indent = oldindent;
 629 }
 630
 631 /* Call this function from the debugger to see what X looks like.  */
 632
 633 void
 634 debug_rtx (const_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 (const_rtx x, int n)
 655 {
 656   int i,count;
 657   const_rtx insn;
 658
 659   count = n == 0 ? 1 : n < 0 ? -n : n;
 660
 661   /* If we are printing a window, back up to the start.  */
 662
 663   if (n < 0)
 664     for (i = count / 2; i > 0; i--)
 665       {
 666         if (PREV_INSN (x) == 0)
 667           break;
 668         x = PREV_INSN (x);
 669       }
 670
 671   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 672     {
 673       debug_rtx (insn);
 674       fprintf (stderr, "\n");
 675     }
 676 }
 677
 678 /* Call this function to print an rtx list from START to END inclusive.  */
 679
 680 void
 681 debug_rtx_range (const_rtx start, const_rtx end)
 682 {
 683   while (1)
 684     {
 685       debug_rtx (start);
 686       fprintf (stderr, "\n");
 687       if (!start || start == end)
 688         break;
 689       start = NEXT_INSN (start);
 690     }
 691 }
 692
 693 /* Call this function to search an rtx list to find one with insn uid UID,
 694    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 695    The found insn is returned to enable further debugging analysis.  */
 696
 697 const_rtx
 698 debug_rtx_find (const_rtx x, int uid)
 699 {
 700   while (x != 0 && INSN_UID (x) != uid)
 701     x = NEXT_INSN (x);
 702   if (x != 0)
 703     {
 704       debug_rtx_list (x, debug_rtx_count);
 705       return x;
 706     }
 707   else
 708     {
 709       fprintf (stderr, "insn uid %d not found\n", uid);
 710       return 0;
 711     }
 712 }
 713
 714 /* External entry point for printing a chain of insns
 715    starting with RTX_FIRST onto file OUTF.
 716    A blank line separates insns.
 717
 718    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 719
 720 void
 721 print_rtl (FILE *outf, const_rtx rtx_first)
 722 {
 723   const_rtx tmp_rtx;
 724
 725   outfile = outf;
 726   sawclose = 0;
 727
 728   if (rtx_first == 0)
 729     {
 730       fputs (print_rtx_head, outf);
 731       fputs ("(nil)\n", outf);
 732     }
 733   else
 734     switch (GET_CODE (rtx_first))
 735       {
 736       case INSN:
 737       case JUMP_INSN:
 738       case CALL_INSN:
 739       case NOTE:
 740       case CODE_LABEL:
 741       case BARRIER:
 742         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 743           {
 744             fputs (print_rtx_head, outfile);
 745             print_rtx (tmp_rtx);
 746             fprintf (outfile, "\n");
 747           }
 748         break;
 749
 750       default:
 751         fputs (print_rtx_head, outfile);
 752         print_rtx (rtx_first);
 753       }
 754 }
 755
 756 /* Like print_rtx, except specify a file.  */
 757 /* Return nonzero if we actually printed anything.  */
 758
 759 int
 760 print_rtl_single (FILE *outf, const_rtx x)
 761 {
 762   outfile = outf;
 763   sawclose = 0;
 764   fputs (print_rtx_head, outfile);
 765   print_rtx (x);
 766   putc ('\n', outf);
 767   return 1;
 768 }
 769
 770
 771 /* Like print_rtl except without all the detail; for example,
 772    if RTX is a CONST_INT then print in decimal format.  */
 773
 774 void
 775 print_simple_rtl (FILE *outf, const_rtx x)
 776 {
 777   flag_simple = 1;
 778   print_rtl (outf, x);
 779   flag_simple = 0;
 780 }