gcc/print-rtl.c

   1 /* Print RTL for GNU C Compiler.
   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           PARAMS ((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 (outfile, expr)
  84      FILE *outfile;
  85      tree expr;
  86 {
  87   if (TREE_CODE (expr) == COMPONENT_REF)
  88     {
  89       if (TREE_OPERAND (expr, 0))
  90         print_mem_expr (outfile, TREE_OPERAND (expr, 0));
  91       else
  92         fputs (" <variable>", outfile);
  93       if (DECL_NAME (TREE_OPERAND (expr, 1)))
  94         fprintf (outfile, ".%s",
  95                  IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (expr, 1))));
  96     }
  97   else if (TREE_CODE (expr) == INDIRECT_REF)
  98     {
  99       fputs (" (*", outfile);
 100       print_mem_expr (outfile, TREE_OPERAND (expr, 0));
 101       fputs (")", outfile);
 102     }
 103   else if (DECL_NAME (expr))
 104     fprintf (outfile, " %s", IDENTIFIER_POINTER (DECL_NAME (expr)));
 105   else if (TREE_CODE (expr) == RESULT_DECL)
 106     fputs (" <result>", outfile);
 107   else
 108     fputs (" <anonymous>", outfile);
 109 }
 110
 111 /* Print IN_RTX onto OUTFILE.  This is the recursive part of printing.  */
 112
 113 static void
 114 print_rtx (in_rtx)
 115      rtx in_rtx;
 116 {
 117   int i = 0;
 118   int j;
 119   const char *format_ptr;
 120   int is_insn;
 121   rtx tem;
 122
 123   if (sawclose)
 124     {
 125       if (flag_simple)
 126         fputc (' ', outfile);
 127       else
 128         fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 129       sawclose = 0;
 130     }
 131
 132   if (in_rtx == 0)
 133     {
 134       fputs ("(nil)", outfile);
 135       sawclose = 1;
 136       return;
 137     }
 138   else if (GET_CODE (in_rtx) > NUM_RTX_CODE)
 139     {
 140        fprintf (outfile, "(??? bad code %d\n)", GET_CODE (in_rtx));
 141        sawclose = 1;
 142        return;
 143     }
 144
 145   is_insn = INSN_P (in_rtx);
 146
 147   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 148      in separate nodes and therefore have to handle them special here.  */
 149   if (dump_for_graph
 150       && (is_insn || GET_CODE (in_rtx) == NOTE
 151           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 152     {
 153       i = 3;
 154       indent = 0;
 155     }
 156   else
 157     {
 158       /* Print name of expression code.  */
 159       if (flag_simple && GET_CODE (in_rtx) == CONST_INT)
 160         fputc ('(', outfile);
 161       else
 162         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 163
 164       if (! flag_simple)
 165         {
 166           if (RTX_FLAG (in_rtx, in_struct))
 167             fputs ("/s", outfile);
 168
 169           if (RTX_FLAG (in_rtx, volatil))
 170             fputs ("/v", outfile);
 171
 172           if (RTX_FLAG (in_rtx, unchanging))
 173             fputs ("/u", outfile);
 174
 175           if (RTX_FLAG (in_rtx, integrated))
 176             fputs ("/i", outfile);
 177
 178           if (RTX_FLAG (in_rtx, frame_related))
 179             fputs ("/f", outfile);
 180
 181           if (RTX_FLAG (in_rtx, jump))
 182             fputs ("/j", outfile);
 183
 184           if (RTX_FLAG (in_rtx, call))
 185             fputs ("/c", outfile);
 186
 187           if (GET_MODE (in_rtx) != VOIDmode)
 188             {
 189               /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 190               if (GET_CODE (in_rtx) == EXPR_LIST
 191                   || GET_CODE (in_rtx) == INSN_LIST)
 192                 fprintf (outfile, ":%s",
 193                          GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 194               else
 195                 fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 196             }
 197         }
 198     }
 199
 200 #ifndef GENERATOR_FILE
 201   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 202     i = 5;
 203 #endif
 204
 205   /* Get the format string and skip the first elements if we have handled
 206      them already.  */
 207   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 208   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 209     switch (*format_ptr++)
 210       {
 211         const char *str;
 212
 213       case 'T':
 214         str = XTMPL (in_rtx, i);
 215         goto string;
 216
 217       case 'S':
 218       case 's':
 219         str = XSTR (in_rtx, i);
 220       string:
 221
 222         if (str == 0)
 223           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 224         else
 225           {
 226             if (dump_for_graph)
 227               fprintf (outfile, " (\\\"%s\\\")", str);
 228             else
 229               fprintf (outfile, " (\"%s\")", str);
 230           }
 231         sawclose = 1;
 232         break;
 233
 234         /* 0 indicates a field for internal use that should not be printed.
 235            An exception is the third field of a NOTE, where it indicates
 236            that the field has several different valid contents.  */
 237       case '0':
 238         if (i == 1 && GET_CODE (in_rtx) == REG)
 239           {
 240             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 241               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 242             break;
 243           }
 244         if (i == 4 && GET_CODE (in_rtx) == NOTE)
 245           {
 246             switch (NOTE_LINE_NUMBER (in_rtx))
 247               {
 248               case NOTE_INSN_EH_REGION_BEG:
 249               case NOTE_INSN_EH_REGION_END:
 250                 if (flag_dump_unnumbered)
 251                   fprintf (outfile, " #");
 252                 else
 253                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 254                 sawclose = 1;
 255                 break;
 256
 257               case NOTE_INSN_BLOCK_BEG:
 258               case NOTE_INSN_BLOCK_END:
 259                 fprintf (outfile, " ");
 260                 if (flag_dump_unnumbered)
 261                   fprintf (outfile, "#");
 262                 else
 263                   fprintf (outfile, HOST_PTR_PRINTF,
 264                            (char *) NOTE_BLOCK (in_rtx));
 265                 sawclose = 1;
 266                 break;
 267
 268               case NOTE_INSN_BASIC_BLOCK:
 269                 {
 270                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 271                   if (bb != 0)
 272                     fprintf (outfile, " [bb %d]", bb->index);
 273                   break;
 274                 }
 275
 276               case NOTE_INSN_EXPECTED_VALUE:
 277                 indent += 2;
 278                 if (!sawclose)
 279                   fprintf (outfile, " ");
 280                 print_rtx (NOTE_EXPECTED_VALUE (in_rtx));
 281                 indent -= 2;
 282                 break;
 283
 284               case NOTE_INSN_DELETED_LABEL:
 285                 if (NOTE_SOURCE_FILE (in_rtx))
 286                   fprintf (outfile, " (\"%s\")", NOTE_SOURCE_FILE (in_rtx));
 287                 else
 288                   fprintf (outfile, " \"\"");
 289                 break;
 290
 291               case NOTE_INSN_PREDICTION:
 292                 if (NOTE_PREDICTION (in_rtx))
 293                   fprintf (outfile, " [ %d %d ] ",
 294                            (int)NOTE_PREDICTION_ALG (in_rtx),
 295                            (int) NOTE_PREDICTION_FLAGS (in_rtx));
 296                 else
 297                   fprintf (outfile, " [ ERROR ]");
 298                 break;
 299
 300               default:
 301                 {
 302                   const char * const str = X0STR (in_rtx, i);
 303
 304                   if (NOTE_LINE_NUMBER (in_rtx) < 0)
 305                     ;
 306                   else if (str == 0)
 307                     fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 308                   else
 309                     {
 310                       if (dump_for_graph)
 311                         fprintf (outfile, " (\\\"%s\\\")", str);
 312                       else
 313                         fprintf (outfile, " (\"%s\")", str);
 314                     }
 315                   break;
 316                 }
 317               }
 318           }
 319         break;
 320
 321       case 'e':
 322       do_e:
 323         indent += 2;
 324         if (!sawclose)
 325           fprintf (outfile, " ");
 326         print_rtx (XEXP (in_rtx, i));
 327         indent -= 2;
 328         break;
 329
 330       case 'E':
 331       case 'V':
 332         indent += 2;
 333         if (sawclose)
 334           {
 335             fprintf (outfile, "\n%s%*s",
 336                      print_rtx_head, indent * 2, "");
 337             sawclose = 0;
 338           }
 339         fputs (" [", outfile);
 340         if (NULL != XVEC (in_rtx, i))
 341           {
 342             indent += 2;
 343             if (XVECLEN (in_rtx, i))
 344               sawclose = 1;
 345
 346             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 347               print_rtx (XVECEXP (in_rtx, i, j));
 348
 349             indent -= 2;
 350           }
 351         if (sawclose)
 352           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 353
 354         fputs ("]", outfile);
 355         sawclose = 1;
 356         indent -= 2;
 357         break;
 358
 359       case 'w':
 360         if (! flag_simple)
 361           fprintf (outfile, " ");
 362         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 363         if (! flag_simple)
 364           {
 365             fprintf (outfile, " [");
 366             fprintf (outfile, HOST_WIDE_INT_PRINT_HEX, XWINT (in_rtx, i));
 367             fprintf (outfile, "]");
 368           }
 369         break;
 370
 371       case 'i':
 372         if (i == 6 && GET_CODE (in_rtx) == NOTE)
 373           {
 374             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 375                other times often contains garbage from INSN->NOTE death.  */
 376             if (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_DELETED_LABEL)
 377               fprintf (outfile, " %d",  XINT (in_rtx, i));
 378           }
 379         else
 380           {
 381             int value = XINT (in_rtx, i);
 382             const char *name;
 383
 384             if (GET_CODE (in_rtx) == REG && value < FIRST_PSEUDO_REGISTER)
 385               {
 386                 fputc (' ', outfile);
 387                 DEBUG_PRINT_REG (in_rtx, 0, outfile);
 388               }
 389             else if (GET_CODE (in_rtx) == REG
 390                      && value <= LAST_VIRTUAL_REGISTER)
 391               {
 392                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 393                   fprintf (outfile, " %d virtual-incoming-args", value);
 394                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 395                   fprintf (outfile, " %d virtual-stack-vars", value);
 396                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 397                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 398                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 399                   fprintf (outfile, " %d virtual-outgoing-args", value);
 400                 else if (value == VIRTUAL_CFA_REGNUM)
 401                   fprintf (outfile, " %d virtual-cfa", value);
 402                 else
 403                   fprintf (outfile, " %d virtual-reg-%d", value,
 404                            value-FIRST_VIRTUAL_REGISTER);
 405               }
 406             else if (flag_dump_unnumbered
 407                      && (is_insn || GET_CODE (in_rtx) == NOTE))
 408               fputc ('#', outfile);
 409             else
 410               fprintf (outfile, " %d", value);
 411
 412             if (GET_CODE (in_rtx) == REG && REG_ATTRS (in_rtx))
 413               {
 414                 fputs (" [", outfile);
 415                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 416                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 417                 if (REG_EXPR (in_rtx))
 418                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 419
 420                 if (REG_OFFSET (in_rtx))
 421                   {
 422                     fputc ('+', outfile);
 423                     fprintf (outfile, HOST_WIDE_INT_PRINT_DEC,
 424                              REG_OFFSET (in_rtx));
 425                   }
 426                 fputs (" ]", outfile);
 427               }
 428
 429             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 430                 && XINT (in_rtx, i) >= 0
 431                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 432               fprintf (outfile, " {%s}", name);
 433             sawclose = 0;
 434           }
 435         break;
 436
 437       /* Print NOTE_INSN names rather than integer codes.  */
 438
 439       case 'n':
 440         if (XINT (in_rtx, i) >= (int) NOTE_INSN_BIAS
 441             && XINT (in_rtx, i) < (int) NOTE_INSN_MAX)
 442           fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 443         else
 444           fprintf (outfile, " %d", XINT (in_rtx, i));
 445         sawclose = 0;
 446         break;
 447
 448       case 'u':
 449         if (XEXP (in_rtx, i) != NULL)
 450           {
 451             rtx sub = XEXP (in_rtx, i);
 452             enum rtx_code subc = GET_CODE (sub);
 453
 454             if (GET_CODE (in_rtx) == LABEL_REF)
 455               {
 456                 if (subc == NOTE
 457                     && NOTE_LINE_NUMBER (sub) == NOTE_INSN_DELETED_LABEL)
 458                   {
 459                     if (flag_dump_unnumbered)
 460                       fprintf (outfile, " [# deleted]");
 461                     else
 462                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 463                     sawclose = 0;
 464                     break;
 465                   }
 466
 467                 if (subc != CODE_LABEL)
 468                   goto do_e;
 469               }
 470
 471             if (flag_dump_unnumbered)
 472               fputs (" #", outfile);
 473             else
 474               fprintf (outfile, " %d", INSN_UID (sub));
 475           }
 476         else
 477           fputs (" 0", outfile);
 478         sawclose = 0;
 479         break;
 480
 481       case 'b':
 482         if (XBITMAP (in_rtx, i) == NULL)
 483           fputs (" {null}", outfile);
 484         else
 485           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 486         sawclose = 0;
 487         break;
 488
 489       case 't':
 490         putc (' ', outfile);
 491         fprintf (outfile, HOST_PTR_PRINTF, (char *) 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       fputs (" [", outfile);
 516       fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, MEM_ALIAS_SET (in_rtx));
 517
 518       if (MEM_EXPR (in_rtx))
 519         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 520
 521       if (MEM_OFFSET (in_rtx))
 522         {
 523           fputc ('+', outfile);
 524           fprintf (outfile, HOST_WIDE_INT_PRINT_DEC,
 525                    INTVAL (MEM_OFFSET (in_rtx)));
 526         }
 527
 528       if (MEM_SIZE (in_rtx))
 529         {
 530           fputs (" S", outfile);
 531           fprintf (outfile, HOST_WIDE_INT_PRINT_DEC,
 532                    INTVAL (MEM_SIZE (in_rtx)));
 533         }
 534
 535       if (MEM_ALIGN (in_rtx) != 1)
 536         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 537
 538       fputc (']', outfile);
 539       break;
 540
 541     case CONST_DOUBLE:
 542       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 543         {
 544           char s[60];
 545
 546           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 547                            sizeof (s), 0, 1);
 548           fprintf (outfile, " %s", s);
 549
 550           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 551                                sizeof (s), 0, 1);
 552           fprintf (outfile, " [%s]", s);
 553         }
 554       break;
 555 #endif
 556
 557     case CODE_LABEL:
 558       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 559       switch (LABEL_KIND (in_rtx))
 560         {
 561           case LABEL_NORMAL: break;
 562           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 563           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 564           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 565           default: abort();
 566         }
 567       break;
 568
 569     case CALL_PLACEHOLDER:
 570       if (debug_call_placeholder_verbose)
 571         {
 572           fputs (" (cond [\n  (const_string \"normal\") (sequence [", outfile);
 573           for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 574             {
 575               fputs ("\n    ", outfile);
 576               print_inline_rtx (outfile, tem, 4);
 577             }
 578
 579           tem = XEXP (in_rtx, 1);
 580           if (tem)
 581             fputs ("\n    ])\n  (const_string \"tail_call\") (sequence [",
 582                    outfile);
 583           for (; tem != 0; tem = NEXT_INSN (tem))
 584             {
 585               fputs ("\n    ", outfile);
 586               print_inline_rtx (outfile, tem, 4);
 587             }
 588
 589           tem = XEXP (in_rtx, 2);
 590           if (tem)
 591             fputs ("\n    ])\n  (const_string \"tail_recursion\") (sequence [",
 592                    outfile);
 593           for (; tem != 0; tem = NEXT_INSN (tem))
 594             {
 595               fputs ("\n    ", outfile);
 596               print_inline_rtx (outfile, tem, 4);
 597             }
 598
 599           fputs ("\n    ])\n  ])", outfile);
 600           break;
 601         }
 602
 603       for (tem = XEXP (in_rtx, 0); tem != 0; tem = NEXT_INSN (tem))
 604         if (GET_CODE (tem) == CALL_INSN)
 605           {
 606             fprintf (outfile, " ");
 607             print_rtx (tem);
 608             break;
 609           }
 610       break;
 611
 612     default:
 613       break;
 614     }
 615
 616   if (dump_for_graph
 617       && (is_insn || GET_CODE (in_rtx) == NOTE
 618           || GET_CODE (in_rtx) == CODE_LABEL || GET_CODE (in_rtx) == BARRIER))
 619     sawclose = 0;
 620   else
 621     {
 622       fputc (')', outfile);
 623       sawclose = 1;
 624     }
 625 }
 626
 627 /* Print an rtx on the current line of FILE.  Initially indent IND
 628    characters.  */
 629
 630 void
 631 print_inline_rtx (outf, x, ind)
 632      FILE *outf;
 633      rtx x;
 634      int ind;
 635 {
 636   int oldsaw = sawclose;
 637   int oldindent = indent;
 638
 639   sawclose = 0;
 640   indent = ind;
 641   outfile = outf;
 642   print_rtx (x);
 643   sawclose = oldsaw;
 644   indent = oldindent;
 645 }
 646
 647 /* Call this function from the debugger to see what X looks like.  */
 648
 649 void
 650 debug_rtx (x)
 651      rtx x;
 652 {
 653   outfile = stderr;
 654   sawclose = 0;
 655   print_rtx (x);
 656   fprintf (stderr, "\n");
 657 }
 658
 659 /* Count of rtx's to print with debug_rtx_list.
 660    This global exists because gdb user defined commands have no arguments.  */
 661
 662 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 663
 664 /* Call this function to print list from X on.
 665
 666    N is a count of the rtx's to print. Positive values print from the specified
 667    rtx on.  Negative values print a window around the rtx.
 668    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 669
 670 void
 671 debug_rtx_list (x, n)
 672      rtx x;
 673      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 (start, end)
 701      rtx start, end;
 702 {
 703   while (1)
 704     {
 705       debug_rtx (start);
 706       fprintf (stderr, "\n");
 707       if (!start || start == end)
 708         break;
 709       start = NEXT_INSN (start);
 710     }
 711 }
 712
 713 /* Call this function to search an rtx list to find one with insn uid UID,
 714    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 715    The found insn is returned to enable further debugging analysis.  */
 716
 717 rtx
 718 debug_rtx_find (x, uid)
 719      rtx x;
 720      int uid;
 721 {
 722   while (x != 0 && INSN_UID (x) != uid)
 723     x = NEXT_INSN (x);
 724   if (x != 0)
 725     {
 726       debug_rtx_list (x, debug_rtx_count);
 727       return x;
 728     }
 729   else
 730     {
 731       fprintf (stderr, "insn uid %d not found\n", uid);
 732       return 0;
 733     }
 734 }
 735
 736 /* External entry point for printing a chain of insns
 737    starting with RTX_FIRST onto file OUTF.
 738    A blank line separates insns.
 739
 740    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 741
 742 void
 743 print_rtl (outf, rtx_first)
 744      FILE *outf;
 745      rtx rtx_first;
 746 {
 747   rtx tmp_rtx;
 748
 749   outfile = outf;
 750   sawclose = 0;
 751
 752   if (rtx_first == 0)
 753     {
 754       fputs (print_rtx_head, outf);
 755       fputs ("(nil)\n", outf);
 756     }
 757   else
 758     switch (GET_CODE (rtx_first))
 759       {
 760       case INSN:
 761       case JUMP_INSN:
 762       case CALL_INSN:
 763       case NOTE:
 764       case CODE_LABEL:
 765       case BARRIER:
 766         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 767           if (! flag_dump_unnumbered
 768               || GET_CODE (tmp_rtx) != NOTE || NOTE_LINE_NUMBER (tmp_rtx) < 0)
 769             {
 770               fputs (print_rtx_head, outfile);
 771               print_rtx (tmp_rtx);
 772               fprintf (outfile, "\n");
 773             }
 774         break;
 775
 776       default:
 777         fputs (print_rtx_head, outfile);
 778         print_rtx (rtx_first);
 779       }
 780 }
 781
 782 /* Like print_rtx, except specify a file.  */
 783 /* Return nonzero if we actually printed anything.  */
 784
 785 int
 786 print_rtl_single (outf, x)
 787      FILE *outf;
 788      rtx x;
 789 {
 790   outfile = outf;
 791   sawclose = 0;
 792   if (! flag_dump_unnumbered
 793       || GET_CODE (x) != NOTE || NOTE_LINE_NUMBER (x) < 0)
 794     {
 795       fputs (print_rtx_head, outfile);
 796       print_rtx (x);
 797       putc ('\n', outf);
 798       return 1;
 799     }
 800   return 0;
 801 }
 802
 803
 804 /* Like print_rtl except without all the detail; for example,
 805    if RTX is a CONST_INT then print in decimal format.  */
 806
 807 void
 808 print_simple_rtl (outf, x)
 809      FILE *outf;
 810      rtx x;
 811 {
 812   flag_simple = 1;
 813   print_rtl (outf, x);
 814   flag_simple = 0;
 815 }