gcc/print-rtl.c

   1 /* Print RTL for GCC.
   2    Copyright (C) 1987, 1988, 1992, 1997, 1998, 1999, 2000, 2002, 2003
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27 #include "rtl.h"
  28
  29 /* We don't want the tree code checking code for the access to the
  30    DECL_NAME to be included in the gen* programs.  */
  31 #undef ENABLE_TREE_CHECKING
  32 #include "tree.h"
  33 #include "real.h"
  34 #include "flags.h"
  35 #include "hard-reg-set.h"
  36 #include "basic-block.h"
  37 #include "tm_p.h"
  38
  39 static FILE *outfile;
  40
  41 static int sawclose = 0;
  42
  43 static int indent;
  44
  45 static void print_rtx (rtx);
  46
  47 /* String printed at beginning of each RTL when it is dumped.
  48    This string is set to ASM_COMMENT_START when the RTL is dumped in
  49    the assembly output file.  */
  50 const char *print_rtx_head = "";
  51
  52 /* Nonzero means suppress output of instruction numbers and line number
  53    notes in debugging dumps.
  54    This must be defined here so that programs like gencodes can be linked.  */
  55 int flag_dump_unnumbered = 0;
  56
  57 /* Nonzero means use simplified format without flags, modes, etc.  */
  58 int flag_simple = 0;
  59
  60 /* Nonzero if we are dumping graphical description.  */
  61 int dump_for_graph;
  62
  63 /* Nonzero to dump all call_placeholder alternatives.  */
  64 static int debug_call_placeholder_verbose;
  65
  66 void
  67 print_mem_expr (FILE *outfile, tree expr)
  68 {
  69   if (TREE_CODE (expr) == COMPONENT_REF)
  70     {
  71       if (TREE_OPERAND (expr, 0))
  72         print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  73       else
  74         fputs (" <variable>", outfile);
  75       if (DECL_NAME (TREE_OPERAND (expr, 1)))
  76         fprintf (outfile, ".%s",
  77                  IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (expr, 1))));
  78     }
  79   else if (TREE_CODE (expr) == INDIRECT_REF)
  80     {
  81       fputs (" (*", outfile);
  82       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  83       fputs (")", outfile);
  84     }
  85   else if (DECL_NAME (expr))
  86     fprintf (outfile, " %s", IDENTIFIER_POINTER (DECL_NAME (expr)));
  87   else if (TREE_CODE (expr) == RESULT_DECL)
  88     fputs (" <result>", outfile);
  89   else
  90     fputs (" <anonymous>", outfile);
  91 }
  92
  93 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
  94
  95 static void
  96 print_rtx (rtx in_rtx)
  97 {
  98   int i = 0;
  99   int j;
 100   const char *format_ptr;
 101   int is_insn;
 102   rtx tem;
 103
 104   if (sawclose)
 105     {
 106       if (flag_simple)
 107         fputc (' ', outfile);
 108       else
 109         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 110       sawclose = 0;
 111     }
 112
 113   if (in_rtx == 0)
 114     {
 115       fputs ("(nil)", outfile);
 116       sawclose = 1;
 117       return;
 118     }
 119   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 120     {
 121        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 122        sawclose = 1;
 123        return;
 124     }
 125
 126   is_insn = INSN_P (in_rtx);
 127
 128   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 129      in separate nodes and therefore have to handle them special here.  */
 130   if (dump_for_graph
 131       && (is_insn || GET_CODE (in_rtx) == NOTE
 132           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 133     {
 134       i = 3;
 135       indent = 0;
 136     }
 137   else
 138     {
 139       /* Print name of expression code.  */
 140       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 141         fputc ('(', outfile);
 142       else
 143         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 144
 145       if (! flag_simple)
 146         {
 147           if (RTX_FLAG (in_rtx, in_struct))
 148             fputs ("/s", outfile);
 149
 150           if (RTX_FLAG (in_rtx, volatil))
 151             fputs ("/v", outfile);
 152
 153           if (RTX_FLAG (in_rtx, unchanging))
 154             fputs ("/u", outfile);
 155
 156           if (RTX_FLAG (in_rtx, integrated))
 157             fputs ("/i", outfile);
 158
 159           if (RTX_FLAG (in_rtx, frame_related))
 160             fputs ("/f", outfile);
 161
 162           if (RTX_FLAG (in_rtx, jump))
 163             fputs ("/j", outfile);
 164
 165           if (RTX_FLAG (in_rtx, call))
 166             fputs ("/c", outfile);
 167
 168           if (GET_MODE (in_rtx) != VOIDmode)
 169             {
 170               /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 171               if (GET_CODE (in_rtx) == EXPR_LIST
 172                   || GET_CODE (in_rtx) == INSN_LIST)
 173                 fprintf (outfile, ":%s",
 174                          GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 175               else
 176                 fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 177             }
 178         }
 179     }
 180
 181 #ifndef GENERATOR_FILE
 182   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 183     i = 5;
 184 #endif
 185
 186   /* Get the format string and skip the first elements if we have handled
 187      them already.  */
 188   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 189   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 190     switch (*format_ptr++)
 191       {
 192         const char *str;
 193
 194       case 'T':
 195         str = XTMPL (in_rtx, i);
 196         goto string;
 197
 198       case 'S':
 199       case 's':
 200         str = XSTR (in_rtx, i);
 201       string:
 202
 203         if (str == 0)
 204           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 205         else
 206           {
 207             if (dump_for_graph)
 208               fprintf (outfile, " (\\\"%s\\\")", str);
 209             else
 210               fprintf (outfile, " (\"%s\")", str);
 211           }
 212         sawclose = 1;
 213         break;
 214
 215         /* 0 indicates a field for internal use that should not be printed.
 216            An exception is the third field of a NOTE, where it indicates
 217            that the field has several different valid contents.  */
 218       case '0':
 219         if (i == 1 && GET_CODE (in_rtx) == REG)
 220           {
 221             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 222               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 223           }
 224 #ifndef GENERATOR_FILE
 225         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 226           {
 227             int flags = SYMBOL_REF_FLAGS (in_rtx);
 228             if (flags)
 229               fprintf (outfile, " [flags 0x%x]", flags);
 230           }
 231         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 232           {
 233             tree decl = SYMBOL_REF_DECL (in_rtx);
 234             if (decl)
 235               print_node_brief (outfile, "", decl, 0);
 236           }
 237 #endif
 238         else if (i == 4 && GET_CODE (in_rtx) == NOTE)
 239           {
 240             switch (NOTE_LINE_NUMBER (in_rtx))
 241               {
 242               case NOTE_INSN_EH_REGION_BEG:
 243               case NOTE_INSN_EH_REGION_END:
 244                 if (flag_dump_unnumbered)
 245                   fprintf (outfile, " #");
 246                 else
 247                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 248                 sawclose = 1;
 249                 break;
 250
 251               case NOTE_INSN_BLOCK_BEG:
 252               case NOTE_INSN_BLOCK_END:
 253                 fprintf (outfile, " ");
 254                 if (flag_dump_unnumbered)
 255                   fprintf (outfile, "#");
 256                 else
 257                   fprintf (outfile, HOST_PTR_PRINTF,
 258                            (char *) NOTE_BLOCK (in_rtx));
 259                 sawclose = 1;
 260                 break;
 261
 262               case NOTE_INSN_BASIC_BLOCK:
 263                 {
 264                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 265                   if (bb != 0)
 266                     fprintf (outfile, " [bb %d]", bb->index);
 267                   break;
 268                 }
 269
 270               case NOTE_INSN_EXPECTED_VALUE:
 271                 indent += 2;
 272                 if (!sawclose)
 273                   fprintf (outfile, " ");
 274                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 275                 indent -= 2;
 276                 break;
 277
 278               case NOTE_INSN_DELETED_LABEL:
 279                 if (NOTE_SOURCE_FILE (in_rtx))
 280                   fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
 281                 else
 282                   fprintf (outfile, " \"\"");
 283                 break;
 284
 285               case NOTE_INSN_PREDICTION:
 286                 if (NOTE_PREDICTION (in_rtx))
 287                   fprintf (outfile, " [ %d %d ] ",
 288                            (int)NOTE_PREDICTION_ALG (in_rtx),
 289                            (int) NOTE_PREDICTION_FLAGS (in_rtx));
 290                 else
 291                   fprintf (outfile, " [ ERROR ]");
 292                 break;
 293
 294               default:
 295                 {
 296                   const char * const str = X0STR (in_rtx, i);
 297
 298                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 299                     ;
 300                   else if (str == 0)
 301                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 302                   else
 303                     {
 304                       if (dump_for_graph)
 305                         fprintf (outfile, " (\\\"%s\\\")", str);
 306                       else
 307                         fprintf (outfile, " (\"%s\")", str);
 308                     }
 309                   break;
 310                 }
 311               }
 312           }
 313         break;
 314
 315       case 'e':
 316       do_e:
 317         indent += 2;
 318         if (!sawclose)
 319           fprintf (outfile, " ");
 320         print_rtx (XEXP (in_rtx, i));
 321         indent -= 2;
 322         break;
 323
 324       case 'E':
 325       case 'V':
 326         indent += 2;
 327         if (sawclose)
 328           {
 329             fprintf (outfile, "\n%s%*s",
 330                      print_rtx_head, indent * 2, "");
 331             sawclose = 0;
 332           }
 333         fputs (" [", outfile);
 334         if (NULL != XVEC (in_rtx, i))
 335           {
 336             indent += 2;
 337             if (XVECLEN (in_rtx, i))
 338               sawclose = 1;
 339
 340             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 341               print_rtx (XVECEXP (in_rtx, i, j));
 342
 343             indent -= 2;
 344           }
 345         if (sawclose)
 346           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 347
 348         fputs ("]", outfile);
 349         sawclose = 1;
 350         indent -= 2;
 351         break;
 352
 353       case 'w':
 354         if (! flag_simple)
 355           fprintf (outfile, " ");
 356         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 357         if (! flag_simple)
 358           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 359                    XWINT (in_rtx, i));
 360         break;
 361
 362       case 'i':
 363         if (i == 4 && INSN_P (in_rtx))
 364           {
 365 #ifndef GENERATOR_FILE
 366             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 367                 redundant with line number information and do not print anything
 368                 when there is no location information available.  */
 369             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 370               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 371 #endif
 372           }
 373         else if (i == 6 && GET_CODE (in_rtx) == NOTE)
 374           {
 375             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 376                other times often contains garbage from INSN->NOTE death.  */
 377             if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
 378               fprintf (outfile, " %d",  XINT (in_rtx, i));
 379           }
 380         else
 381           {
 382             int value = XINT (in_rtx, i);
 383             const char *name;
 384
 385 #ifndef GENERATOR_FILE
 386             if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 387               {
 388                 fputc (' ', outfile);
 389                 PRINT_REG (in_rtx, -1, outfile);
 390               }
 391             else if (GET_CODE (in_rtx) == REG
 392                      && value <= LAST_VIRTUAL_REGISTER)
 393               {
 394                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 395                   fprintf (outfile, " %d virtual-incoming-args", value);
 396                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 397                   fprintf (outfile, " %d virtual-stack-vars", value);
 398                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 399                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 400                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 401                   fprintf (outfile, " %d virtual-outgoing-args", value);
 402                 else if (value == VIRTUAL_CFA_REGNUM)
 403                   fprintf (outfile, " %d virtual-cfa", value);
 404                 else
 405                   fprintf (outfile, " %d virtual-reg-%d", value,
 406                            value-FIRST_VIRTUAL_REGISTER);
 407               }
 408             else
 409 #endif
 410               if (flag_dump_unnumbered
 411                      && (is_insn || GET_CODE (in_rtx) == NOTE))
 412               fputc ('#', outfile);
 413             else
 414               fprintf (outfile, " %d", value);
 415
 416             if (GET_CODE (in_rtx) == REG && REG_ATTRS (in_rtx))
 417               {
 418                 fputs (" [", outfile);
 419                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 420                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 421                 if (REG_EXPR (in_rtx))
 422                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 423
 424                 if (REG_OFFSET (in_rtx))
 425                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 426                            REG_OFFSET (in_rtx));
 427                 fputs (" ]", outfile);
 428               }
 429
 430             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 431                 && XINT (in_rtx, i) >= 0
 432                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 433               fprintf (outfile, " {%s}", name);
 434             sawclose = 0;
 435           }
 436         break;
 437
 438       /* Print NOTE_INSN names rather than integer codes.  */
 439
 440       case 'n':
 441         if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
 442             && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
 443           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 444         else
 445           fprintf (outfile, " %d", XINT (in_rtx, i));
 446         sawclose = 0;
 447         break;
 448
 449       case 'u':
 450         if (XEXP (in_rtx, i) != NULL)
 451           {
 452             rtx sub = XEXP (in_rtx, i);
 453             enum rtx_code subc = GET_CODE (sub);
 454
 455             if (GET_CODE (in_rtx) == LABEL_REF)
 456               {
 457                 if (subc == NOTE
 458                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 459                   {
 460                     if (flag_dump_unnumbered)
 461                       fprintf (outfile, " [# deleted]");
 462                     else
 463                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 464                     sawclose = 0;
 465                     break;
 466                   }
 467
 468                 if (subc != CODE_LABEL)
 469                   goto do_e;
 470               }
 471
 472             if (flag_dump_unnumbered)
 473               fputs (" #", outfile);
 474             else
 475               fprintf (outfile, " %d", INSN_UID (sub));
 476           }
 477         else
 478           fputs (" 0", outfile);
 479         sawclose = 0;
 480         break;
 481
 482       case 'b':
 483         if (XBITMAP (in_rtx, i) == NULL)
 484           fputs (" {null}", outfile);
 485         else
 486           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 487         sawclose = 0;
 488         break;
 489
 490       case 't':
 491         fprintf (outfile, " " HOST_PTR_PRINTF, (void *) XTREE (in_rtx, i));
 492         break;
 493
 494       case '*':
 495         fputs (" Unknown", outfile);
 496         sawclose = 0;
 497         break;
 498
 499       case 'B':
 500         if (XBBDEF (in_rtx, i))
 501           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 502         break;
 503
 504       default:
 505         fprintf (stderr,
 506                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 507                  format_ptr[-1]);
 508         abort ();
 509       }
 510
 511   switch (GET_CODE (in_rtx))
 512     {
 513 #ifndef GENERATOR_FILE
 514     case MEM:
 515       fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 516
 517       if (MEM_EXPR (in_rtx))
 518         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 519
 520       if (MEM_OFFSET (in_rtx))
 521         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 522                  INTVAL (MEM_OFFSET (in_rtx)));
 523
 524       if (MEM_SIZE (in_rtx))
 525         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 526                  INTVAL (MEM_SIZE (in_rtx)));
 527
 528       if (MEM_ALIGN (in_rtx) != 1)
 529         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 530
 531       fputc (']', outfile);
 532       break;
 533
 534     case CONST_DOUBLE:
 535       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 536         {
 537           char s[60];
 538
 539           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 540                            sizeof (s), 0, 1);
 541           fprintf (outfile, " %s", s);
 542
 543           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 544                                sizeof (s), 0, 1);
 545           fprintf (outfile, " [%s]", s);
 546         }
 547       break;
 548 #endif
 549
 550     case CODE_LABEL:
 551       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 552       switch (LABEL_KIND (in_rtx))
 553         {
 554           case LABEL_NORMAL: break;
 555           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 556           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 557           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 558           default: abort();
 559         }
 560       break;
 561
 562     case CALL_PLACEHOLDER:
 563       if (debug_call_placeholder_verbose)
 564         {
 565           fputs (" (cond [\n  (const_string \"normal\") (sequence [", outfile);
 566           for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 567             {
 568               fputs ("\n    ", outfile);
 569               print_inline_rtx (outfile, tem, 4);
 570             }
 571
 572           tem = XEXP (in_rtx, 1);
 573           if (tem)
 574             fputs ("\n    ])\n  (const_string \"tail_call\") (sequence [",
 575                    outfile);
 576           for (; tem != 0; tem = NEXT_INSN (tem))
 577             {
 578               fputs ("\n    ", outfile);
 579               print_inline_rtx (outfile, tem, 4);
 580             }
 581
 582           tem = XEXP (in_rtx, 2);
 583           if (tem)
 584             fputs ("\n    ])\n  (const_string \"tail_recursion\") (sequence [",
 585                    outfile);
 586           for (; tem != 0; tem = NEXT_INSN (tem))
 587             {
 588               fputs ("\n    ", outfile);
 589               print_inline_rtx (outfile, tem, 4);
 590             }
 591
 592           fputs ("\n    ])\n  ])", outfile);
 593           break;
 594         }
 595
 596       for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 597         if (GET_CODE (tem) == CALL_INSN)
 598           {
 599             fprintf (outfile, " ");
 600             print_rtx (tem);
 601             break;
 602           }
 603       break;
 604
 605     default:
 606       break;
 607     }
 608
 609   if (dump_for_graph
 610       && (is_insn || GET_CODE (in_rtx) == NOTE
 611           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 612     sawclose = 0;
 613   else
 614     {
 615       fputc (')', outfile);
 616       sawclose = 1;
 617     }
 618 }
 619
 620 /* Print an rtx on the current line of FILE.  Initially indent IND
 621    characters.  */
 622
 623 void
 624 print_inline_rtx (FILE *outf, rtx x, int ind)
 625 {
 626   int oldsaw = sawclose;
 627   int oldindent = indent;
 628
 629   sawclose = 0;
 630   indent = ind;
 631   outfile = outf;
 632   print_rtx (x);
 633   sawclose = oldsaw;
 634   indent = oldindent;
 635 }
 636
 637 /* Call this function from the debugger to see what X looks like.  */
 638
 639 void
 640 debug_rtx (rtx x)
 641 {
 642   outfile = stderr;
 643   sawclose = 0;
 644   print_rtx (x);
 645   fprintf (stderr, "\n");
 646 }
 647
 648 /* Count of rtx's to print with debug_rtx_list.
 649    This global exists because gdb user defined commands have no arguments.  */
 650
 651 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 652
 653 /* Call this function to print list from X on.
 654
 655    N is a count of the rtx's to print. Positive values print from the specified
 656    rtx on.  Negative values print a window around the rtx.
 657    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 658
 659 void
 660 debug_rtx_list (rtx x, int n)
 661 {
 662   int i,count;
 663   rtx insn;
 664
 665   count = n == 0 ? 1 : n < 0 ? -n : n;
 666
 667   /* If we are printing a window, back up to the start.  */
 668
 669   if (n < 0)
 670     for (i = count / 2; i > 0; i--)
 671       {
 672         if (PREV_INSN (x) == 0)
 673           break;
 674         x = PREV_INSN (x);
 675       }
 676
 677   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 678     {
 679       debug_rtx (insn);
 680       fprintf (stderr, "\n");
 681     }
 682 }
 683
 684 /* Call this function to print an rtx list from START to END inclusive.  */
 685
 686 void
 687 debug_rtx_range (rtx start, rtx end)
 688 {
 689   while (1)
 690     {
 691       debug_rtx (start);
 692       fprintf (stderr, "\n");
 693       if (!start || start == end)
 694         break;
 695       start = NEXT_INSN (start);
 696     }
 697 }
 698
 699 /* Call this function to search an rtx list to find one with insn uid UID,
 700    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 701    The found insn is returned to enable further debugging analysis.  */
 702
 703 rtx
 704 debug_rtx_find (rtx x, int uid)
 705 {
 706   while (x != 0 && INSN_UID (x) != uid)
 707     x = NEXT_INSN (x);
 708   if (x != 0)
 709     {
 710       debug_rtx_list (x, debug_rtx_count);
 711       return x;
 712     }
 713   else
 714     {
 715       fprintf (stderr, "insn uid %d not found\n", uid);
 716       return 0;
 717     }
 718 }
 719
 720 /* External entry point for printing a chain of insns
 721    starting with RTX_FIRST onto file OUTF.
 722    A blank line separates insns.
 723
 724    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 725
 726 void
 727 print_rtl (FILE *outf, rtx rtx_first)
 728 {
 729   rtx tmp_rtx;
 730
 731   outfile = outf;
 732   sawclose = 0;
 733
 734   if (rtx_first == 0)
 735     {
 736       fputs (print_rtx_head, outf);
 737       fputs ("(nil)\n", outf);
 738     }
 739   else
 740     switch (GET_CODE (rtx_first))
 741       {
 742       case INSN:
 743       case JUMP_INSN:
 744       case CALL_INSN:
 745       case NOTE:
 746       case CODE_LABEL:
 747       case BARRIER:
 748         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 749           if (! flag_dump_unnumbered
 750               || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 751             {
 752               fputs (print_rtx_head, outfile);
 753               print_rtx (tmp_rtx);
 754               fprintf (outfile, "\n");
 755             }
 756         break;
 757
 758       default:
 759         fputs (print_rtx_head, outfile);
 760         print_rtx (rtx_first);
 761       }
 762 }
 763
 764 /* Like print_rtx, except specify a file.  */
 765 /* Return nonzero if we actually printed anything.  */
 766
 767 int
 768 print_rtl_single (FILE *outf, rtx x)
 769 {
 770   outfile = outf;
 771   sawclose = 0;
 772   if (! flag_dump_unnumbered
 773       || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
 774     {
 775       fputs (print_rtx_head, outfile);
 776       print_rtx (x);
 777       putc ('\n', outf);
 778       return 1;
 779     }
 780   return 0;
 781 }
 782
 783
 784 /* Like print_rtl except without all the detail; for example,
 785    if RTX is a CONST_INT then print in decimal format.  */
 786
 787 void
 788 print_simple_rtl (FILE *outf, rtx x)
 789 {
 790   flag_simple = 1;
 791   print_rtl (outf, x);
 792   flag_simple = 0;
 793 }