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
  38 /* How to print out a register name.
  39    We don't use PRINT_REG because some definitions of PRINT_REG
  40    don't work here.  */
  41 #ifndef DEBUG_PRINT_REG
  42 #define DEBUG_PRINT_REG(RTX, CODE, FILE) \
  43   fprintf ((FILE), "%d %s", REGNO (RTX), reg_names[REGNO (RTX)])
  44 #endif
  45
  46 /* Array containing all of the register names */
  47
  48 #ifdef DEBUG_REGISTER_NAMES
  49 static const char * const debug_reg_names[] = DEBUG_REGISTER_NAMES;
  50 #define reg_names debug_reg_names
  51 #else
  52 const char * reg_names[] = REGISTER_NAMES;
  53 #endif
  54
  55 static FILE *outfile;
  56
  57 static int sawclose = 0;
  58
  59 static int indent;
  60
  61 static void print_rtx (rtx);
  62
  63 /* String printed at beginning of each RTL when it is dumped.
  64    This string is set to ASM_COMMENT_START when the RTL is dumped in
  65    the assembly output file.  */
  66 const char *print_rtx_head = "";
  67
  68 /* Nonzero means suppress output of instruction numbers and line number
  69    notes in debugging dumps.
  70    This must be defined here so that programs like gencodes can be linked.  */
  71 int flag_dump_unnumbered = 0;
  72
  73 /* Nonzero means use simplified format without flags, modes, etc.  */
  74 int flag_simple = 0;
  75
  76 /* Nonzero if we are dumping graphical description.  */
  77 int dump_for_graph;
  78
  79 /* Nonzero to dump all call_placeholder alternatives.  */
  80 static int debug_call_placeholder_verbose;
  81
  82 void
  83 print_mem_expr (FILE *outfile, tree expr)
  84 {
  85   if (TREE_CODE (expr) == COMPONENT_REF)
  86     {
  87       if (TREE_OPERAND (expr, 0))
  88         print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  89       else
  90         fputs (" <variable>", outfile);
  91       if (DECL_NAME (TREE_OPERAND (expr, 1)))
  92         fprintf (outfile, ".%s",
  93                  IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (expr, 1))));
  94     }
  95   else if (TREE_CODE (expr) == INDIRECT_REF)
  96     {
  97       fputs (" (*", outfile);
  98       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  99       fputs (")", outfile);
 100     }
 101   else if (DECL_NAME (expr))
 102     fprintf (outfile, " %s", IDENTIFIER_POINTER (DECL_NAME (expr)));
 103   else if (TREE_CODE (expr) == RESULT_DECL)
 104     fputs (" <result>", outfile);
 105   else
 106     fputs (" <anonymous>", outfile);
 107 }
 108
 109 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
 110
 111 static void
 112 print_rtx (rtx in_rtx)
 113 {
 114   int i = 0;
 115   int j;
 116   const char *format_ptr;
 117   int is_insn;
 118   rtx tem;
 119
 120   if (sawclose)
 121     {
 122       if (flag_simple)
 123         fputc (' ', outfile);
 124       else
 125         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 126       sawclose = 0;
 127     }
 128
 129   if (in_rtx == 0)
 130     {
 131       fputs ("(nil)", outfile);
 132       sawclose = 1;
 133       return;
 134     }
 135   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 136     {
 137        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 138        sawclose = 1;
 139        return;
 140     }
 141
 142   is_insn = INSN_P (in_rtx);
 143
 144   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 145      in separate nodes and therefore have to handle them special here.  */
 146   if (dump_for_graph
 147       && (is_insn || GET_CODE (in_rtx) == NOTE
 148           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 149     {
 150       i = 3;
 151       indent = 0;
 152     }
 153   else
 154     {
 155       /* Print name of expression code.  */
 156       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 157         fputc ('(', outfile);
 158       else
 159         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 160
 161       if (! flag_simple)
 162         {
 163           if (RTX_FLAG (in_rtx, in_struct))
 164             fputs ("/s", outfile);
 165
 166           if (RTX_FLAG (in_rtx, volatil))
 167             fputs ("/v", outfile);
 168
 169           if (RTX_FLAG (in_rtx, unchanging))
 170             fputs ("/u", outfile);
 171
 172           if (RTX_FLAG (in_rtx, integrated))
 173             fputs ("/i", outfile);
 174
 175           if (RTX_FLAG (in_rtx, frame_related))
 176             fputs ("/f", outfile);
 177
 178           if (RTX_FLAG (in_rtx, jump))
 179             fputs ("/j", outfile);
 180
 181           if (RTX_FLAG (in_rtx, call))
 182             fputs ("/c", outfile);
 183
 184           if (GET_MODE (in_rtx) != VOIDmode)
 185             {
 186               /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 187               if (GET_CODE (in_rtx) == EXPR_LIST
 188                   || GET_CODE (in_rtx) == INSN_LIST)
 189                 fprintf (outfile, ":%s",
 190                          GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 191               else
 192                 fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 193             }
 194         }
 195     }
 196
 197 #ifndef GENERATOR_FILE
 198   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 199     i = 5;
 200 #endif
 201
 202   /* Get the format string and skip the first elements if we have handled
 203      them already.  */
 204   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 205   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 206     switch (*format_ptr++)
 207       {
 208         const char *str;
 209
 210       case 'T':
 211         str = XTMPL (in_rtx, i);
 212         goto string;
 213
 214       case 'S':
 215       case 's':
 216         str = XSTR (in_rtx, i);
 217       string:
 218
 219         if (str == 0)
 220           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 221         else
 222           {
 223             if (dump_for_graph)
 224               fprintf (outfile, " (\\\"%s\\\")", str);
 225             else
 226               fprintf (outfile, " (\"%s\")", str);
 227           }
 228         sawclose = 1;
 229         break;
 230
 231         /* 0 indicates a field for internal use that should not be printed.
 232            An exception is the third field of a NOTE, where it indicates
 233            that the field has several different valid contents.  */
 234       case '0':
 235         if (i == 1 && GET_CODE (in_rtx) == REG)
 236           {
 237             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 238               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 239           }
 240 #ifndef GENERATOR_FILE
 241         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 242           {
 243             int flags = SYMBOL_REF_FLAGS (in_rtx);
 244             if (flags)
 245               fprintf (outfile, " [flags 0x%x]", flags);
 246           }
 247         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 248           {
 249             tree decl = SYMBOL_REF_DECL (in_rtx);
 250             if (decl)
 251               print_node_brief (outfile, "", decl, 0);
 252           }
 253 #endif
 254         else if (i == 4 && GET_CODE (in_rtx) == NOTE)
 255           {
 256             switch (NOTE_LINE_NUMBER (in_rtx))
 257               {
 258               case NOTE_INSN_EH_REGION_BEG:
 259               case NOTE_INSN_EH_REGION_END:
 260                 if (flag_dump_unnumbered)
 261                   fprintf (outfile, " #");
 262                 else
 263                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 264                 sawclose = 1;
 265                 break;
 266
 267               case NOTE_INSN_BLOCK_BEG:
 268               case NOTE_INSN_BLOCK_END:
 269                 fprintf (outfile, " ");
 270                 if (flag_dump_unnumbered)
 271                   fprintf (outfile, "#");
 272                 else
 273                   fprintf (outfile, HOST_PTR_PRINTF,
 274                            (char *) NOTE_BLOCK (in_rtx));
 275                 sawclose = 1;
 276                 break;
 277
 278               case NOTE_INSN_BASIC_BLOCK:
 279                 {
 280                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 281                   if (bb != 0)
 282                     fprintf (outfile, " [bb %d]", bb->index);
 283                   break;
 284                 }
 285
 286               case NOTE_INSN_EXPECTED_VALUE:
 287                 indent += 2;
 288                 if (!sawclose)
 289                   fprintf (outfile, " ");
 290                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 291                 indent -= 2;
 292                 break;
 293
 294               case NOTE_INSN_DELETED_LABEL:
 295                 if (NOTE_SOURCE_FILE (in_rtx))
 296                   fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
 297                 else
 298                   fprintf (outfile, " \"\"");
 299                 break;
 300
 301               case NOTE_INSN_PREDICTION:
 302                 if (NOTE_PREDICTION (in_rtx))
 303                   fprintf (outfile, " [ %d %d ] ",
 304                            (int)NOTE_PREDICTION_ALG (in_rtx),
 305                            (int) NOTE_PREDICTION_FLAGS (in_rtx));
 306                 else
 307                   fprintf (outfile, " [ ERROR ]");
 308                 break;
 309
 310               default:
 311                 {
 312                   const char * const str = X0STR (in_rtx, i);
 313
 314                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 315                     ;
 316                   else if (str == 0)
 317                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 318                   else
 319                     {
 320                       if (dump_for_graph)
 321                         fprintf (outfile, " (\\\"%s\\\")", str);
 322                       else
 323                         fprintf (outfile, " (\"%s\")", str);
 324                     }
 325                   break;
 326                 }
 327               }
 328           }
 329         break;
 330
 331       case 'e':
 332       do_e:
 333         indent += 2;
 334         if (!sawclose)
 335           fprintf (outfile, " ");
 336         print_rtx (XEXP (in_rtx, i));
 337         indent -= 2;
 338         break;
 339
 340       case 'E':
 341       case 'V':
 342         indent += 2;
 343         if (sawclose)
 344           {
 345             fprintf (outfile, "\n%s%*s",
 346                      print_rtx_head, indent * 2, "");
 347             sawclose = 0;
 348           }
 349         fputs (" [", outfile);
 350         if (NULL != XVEC (in_rtx, i))
 351           {
 352             indent += 2;
 353             if (XVECLEN (in_rtx, i))
 354               sawclose = 1;
 355
 356             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 357               print_rtx (XVECEXP (in_rtx, i, j));
 358
 359             indent -= 2;
 360           }
 361         if (sawclose)
 362           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 363
 364         fputs ("]", outfile);
 365         sawclose = 1;
 366         indent -= 2;
 367         break;
 368
 369       case 'w':
 370         if (! flag_simple)
 371           fprintf (outfile, " ");
 372         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 373         if (! flag_simple)
 374           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 375                    XWINT (in_rtx, i));
 376         break;
 377
 378       case 'i':
 379         if (i == 4 && INSN_P (in_rtx))
 380           {
 381 #ifndef GENERATOR_FILE
 382             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 383                 redundant with line number information and do not print anything
 384                 when there is no location information available.  */
 385             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 386               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 387 #endif
 388           }
 389         else if (i == 6 && GET_CODE (in_rtx) == NOTE)
 390           {
 391             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 392                other times often contains garbage from INSN->NOTE death.  */
 393             if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
 394               fprintf (outfile, " %d",  XINT (in_rtx, i));
 395           }
 396         else
 397           {
 398             int value = XINT (in_rtx, i);
 399             const char *name;
 400
 401             if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 402               {
 403                 fputc (' ', outfile);
 404                 DEBUG_PRINT_REG (in_rtx, 0, outfile);
 405               }
 406             else if (GET_CODE (in_rtx) == REG
 407                      && value <= LAST_VIRTUAL_REGISTER)
 408               {
 409                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 410                   fprintf (outfile, " %d virtual-incoming-args", value);
 411                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 412                   fprintf (outfile, " %d virtual-stack-vars", value);
 413                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 414                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 415                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 416                   fprintf (outfile, " %d virtual-outgoing-args", value);
 417                 else if (value == VIRTUAL_CFA_REGNUM)
 418                   fprintf (outfile, " %d virtual-cfa", value);
 419                 else
 420                   fprintf (outfile, " %d virtual-reg-%d", value,
 421                            value-FIRST_VIRTUAL_REGISTER);
 422               }
 423             else if (flag_dump_unnumbered
 424                      && (is_insn || GET_CODE (in_rtx) == NOTE))
 425               fputc ('#', outfile);
 426             else
 427               fprintf (outfile, " %d", value);
 428
 429             if (GET_CODE (in_rtx) == REG && REG_ATTRS (in_rtx))
 430               {
 431                 fputs (" [", outfile);
 432                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 433                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 434                 if (REG_EXPR (in_rtx))
 435                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 436
 437                 if (REG_OFFSET (in_rtx))
 438                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 439                            REG_OFFSET (in_rtx));
 440                 fputs (" ]", outfile);
 441               }
 442
 443             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 444                 && XINT (in_rtx, i) >= 0
 445                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 446               fprintf (outfile, " {%s}", name);
 447             sawclose = 0;
 448           }
 449         break;
 450
 451       /* Print NOTE_INSN names rather than integer codes.  */
 452
 453       case 'n':
 454         if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
 455             && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
 456           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 457         else
 458           fprintf (outfile, " %d", XINT (in_rtx, i));
 459         sawclose = 0;
 460         break;
 461
 462       case 'u':
 463         if (XEXP (in_rtx, i) != NULL)
 464           {
 465             rtx sub = XEXP (in_rtx, i);
 466             enum rtx_code subc = GET_CODE (sub);
 467
 468             if (GET_CODE (in_rtx) == LABEL_REF)
 469               {
 470                 if (subc == NOTE
 471                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 472                   {
 473                     if (flag_dump_unnumbered)
 474                       fprintf (outfile, " [# deleted]");
 475                     else
 476                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 477                     sawclose = 0;
 478                     break;
 479                   }
 480
 481                 if (subc != CODE_LABEL)
 482                   goto do_e;
 483               }
 484
 485             if (flag_dump_unnumbered)
 486               fputs (" #", outfile);
 487             else
 488               fprintf (outfile, " %d", INSN_UID (sub));
 489           }
 490         else
 491           fputs (" 0", outfile);
 492         sawclose = 0;
 493         break;
 494
 495       case 'b':
 496         if (XBITMAP (in_rtx, i) == NULL)
 497           fputs (" {null}", outfile);
 498         else
 499           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 500         sawclose = 0;
 501         break;
 502
 503       case 't':
 504         fprintf (outfile, " " HOST_PTR_PRINTF, (void *) XTREE (in_rtx, i));
 505         break;
 506
 507       case '*':
 508         fputs (" Unknown", outfile);
 509         sawclose = 0;
 510         break;
 511
 512       case 'B':
 513         if (XBBDEF (in_rtx, i))
 514           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 515         break;
 516
 517       default:
 518         fprintf (stderr,
 519                  "switch format wrong in rtl.print_rtx(). format was: %c.\n",
 520                  format_ptr[-1]);
 521         abort ();
 522       }
 523
 524   switch (GET_CODE (in_rtx))
 525     {
 526 #ifndef GENERATOR_FILE
 527     case MEM:
 528       fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 529
 530       if (MEM_EXPR (in_rtx))
 531         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 532
 533       if (MEM_OFFSET (in_rtx))
 534         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 535                  INTVAL (MEM_OFFSET (in_rtx)));
 536
 537       if (MEM_SIZE (in_rtx))
 538         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 539                  INTVAL (MEM_SIZE (in_rtx)));
 540
 541       if (MEM_ALIGN (in_rtx) != 1)
 542         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 543
 544       fputc (']', outfile);
 545       break;
 546
 547     case CONST_DOUBLE:
 548       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 549         {
 550           char s[60];
 551
 552           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 553                            sizeof (s), 0, 1);
 554           fprintf (outfile, " %s", s);
 555
 556           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 557                                sizeof (s), 0, 1);
 558           fprintf (outfile, " [%s]", s);
 559         }
 560       break;
 561 #endif
 562
 563     case CODE_LABEL:
 564       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 565       switch (LABEL_KIND (in_rtx))
 566         {
 567           case LABEL_NORMAL: break;
 568           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 569           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 570           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 571           default: abort();
 572         }
 573       break;
 574
 575     case CALL_PLACEHOLDER:
 576       if (debug_call_placeholder_verbose)
 577         {
 578           fputs (" (cond [\n  (const_string \"normal\") (sequence [", outfile);
 579           for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 580             {
 581               fputs ("\n    ", outfile);
 582               print_inline_rtx (outfile, tem, 4);
 583             }
 584
 585           tem = XEXP (in_rtx, 1);
 586           if (tem)
 587             fputs ("\n    ])\n  (const_string \"tail_call\") (sequence [",
 588                    outfile);
 589           for (; tem != 0; tem = NEXT_INSN (tem))
 590             {
 591               fputs ("\n    ", outfile);
 592               print_inline_rtx (outfile, tem, 4);
 593             }
 594
 595           tem = XEXP (in_rtx, 2);
 596           if (tem)
 597             fputs ("\n    ])\n  (const_string \"tail_recursion\") (sequence [",
 598                    outfile);
 599           for (; tem != 0; tem = NEXT_INSN (tem))
 600             {
 601               fputs ("\n    ", outfile);
 602               print_inline_rtx (outfile, tem, 4);
 603             }
 604
 605           fputs ("\n    ])\n  ])", outfile);
 606           break;
 607         }
 608
 609       for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 610         if (GET_CODE (tem) == CALL_INSN)
 611           {
 612             fprintf (outfile, " ");
 613             print_rtx (tem);
 614             break;
 615           }
 616       break;
 617
 618     default:
 619       break;
 620     }
 621
 622   if (dump_for_graph
 623       && (is_insn || GET_CODE (in_rtx) == NOTE
 624           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 625     sawclose = 0;
 626   else
 627     {
 628       fputc (')', outfile);
 629       sawclose = 1;
 630     }
 631 }
 632
 633 /* Print an rtx on the current line of FILE.  Initially indent IND
 634    characters.  */
 635
 636 void
 637 print_inline_rtx (FILE *outf, rtx x, int ind)
 638 {
 639   int oldsaw = sawclose;
 640   int oldindent = indent;
 641
 642   sawclose = 0;
 643   indent = ind;
 644   outfile = outf;
 645   print_rtx (x);
 646   sawclose = oldsaw;
 647   indent = oldindent;
 648 }
 649
 650 /* Call this function from the debugger to see what X looks like.  */
 651
 652 void
 653 debug_rtx (rtx x)
 654 {
 655   outfile = stderr;
 656   sawclose = 0;
 657   print_rtx (x);
 658   fprintf (stderr, "\n");
 659 }
 660
 661 /* Count of rtx's to print with debug_rtx_list.
 662    This global exists because gdb user defined commands have no arguments.  */
 663
 664 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 665
 666 /* Call this function to print list from X on.
 667
 668    N is a count of the rtx's to print. Positive values print from the specified
 669    rtx on.  Negative values print a window around the rtx.
 670    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 671
 672 void
 673 debug_rtx_list (rtx x, int n)
 674 {
 675   int i,count;
 676   rtx insn;
 677
 678   count = n == 0 ? 1 : n < 0 ? -n : n;
 679
 680   /* If we are printing a window, back up to the start.  */
 681
 682   if (n < 0)
 683     for (i = count / 2; i > 0; i--)
 684       {
 685         if (PREV_INSN (x) == 0)
 686           break;
 687         x = PREV_INSN (x);
 688       }
 689
 690   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 691     {
 692       debug_rtx (insn);
 693       fprintf (stderr, "\n");
 694     }
 695 }
 696
 697 /* Call this function to print an rtx list from START to END inclusive.  */
 698
 699 void
 700 debug_rtx_range (rtx start, rtx end)
 701 {
 702   while (1)
 703     {
 704       debug_rtx (start);
 705       fprintf (stderr, "\n");
 706       if (!start || start == end)
 707         break;
 708       start = NEXT_INSN (start);
 709     }
 710 }
 711
 712 /* Call this function to search an rtx list to find one with insn uid UID,
 713    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 714    The found insn is returned to enable further debugging analysis.  */
 715
 716 rtx
 717 debug_rtx_find (rtx x, int uid)
 718 {
 719   while (x != 0 && INSN_UID (x) != uid)
 720     x = NEXT_INSN (x);
 721   if (x != 0)
 722     {
 723       debug_rtx_list (x, debug_rtx_count);
 724       return x;
 725     }
 726   else
 727     {
 728       fprintf (stderr, "insn uid %d not found\n", uid);
 729       return 0;
 730     }
 731 }
 732
 733 /* External entry point for printing a chain of insns
 734    starting with RTX_FIRST onto file OUTF.
 735    A blank line separates insns.
 736
 737    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 738
 739 void
 740 print_rtl (FILE *outf, rtx rtx_first)
 741 {
 742   rtx tmp_rtx;
 743
 744   outfile = outf;
 745   sawclose = 0;
 746
 747   if (rtx_first == 0)
 748     {
 749       fputs (print_rtx_head, outf);
 750       fputs ("(nil)\n", outf);
 751     }
 752   else
 753     switch (GET_CODE (rtx_first))
 754       {
 755       case INSN:
 756       case JUMP_INSN:
 757       case CALL_INSN:
 758       case NOTE:
 759       case CODE_LABEL:
 760       case BARRIER:
 761         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 762           if (! flag_dump_unnumbered
 763               || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 764             {
 765               fputs (print_rtx_head, outfile);
 766               print_rtx (tmp_rtx);
 767               fprintf (outfile, "\n");
 768             }
 769         break;
 770
 771       default:
 772         fputs (print_rtx_head, outfile);
 773         print_rtx (rtx_first);
 774       }
 775 }
 776
 777 /* Like print_rtx, except specify a file.  */
 778 /* Return nonzero if we actually printed anything.  */
 779
 780 int
 781 print_rtl_single (FILE *outf, rtx x)
 782 {
 783   outfile = outf;
 784   sawclose = 0;
 785   if (! flag_dump_unnumbered
 786       || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
 787     {
 788       fputs (print_rtx_head, outfile);
 789       print_rtx (x);
 790       putc ('\n', outf);
 791       return 1;
 792     }
 793   return 0;
 794 }
 795
 796
 797 /* Like print_rtl except without all the detail; for example,
 798    if RTX is a CONST_INT then print in decimal format.  */
 799
 800 void
 801 print_simple_rtl (FILE *outf, rtx x)
 802 {
 803   flag_simple = 1;
 804   print_rtl (outf, x);
 805   flag_simple = 0;
 806 }