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%s%*s)", GET_CODE (in_rtx),
 113                 print_rtx_head, indent * 2, "");
 114        sawclose = 1;
 115        return;
 116     }
 117
 118   is_insn = INSN_P (in_rtx);
 119
 120   /* When printing in VCG format we write INSNs, NOTE, LABEL, and BARRIER
 121      in separate nodes and therefore have to handle them special here.  */
 122   if (dump_for_graph
 123       && (is_insn || NOTE_P (in_rtx)
 124           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 125     {
 126       i = 3;
 127       indent = 0;
 128     }
 129   else
 130     {
 131       /* Print name of expression code.  */
 132       if (flag_simple && CONST_INT_P (in_rtx))
 133         fputc ('(', outfile);
 134       else
 135         fprintf (outfile, "(%s", GET_RTX_NAME (GET_CODE (in_rtx)));
 136
 137       if (! flag_simple)
 138         {
 139           if (RTX_FLAG (in_rtx, in_struct))
 140             fputs ("/s", outfile);
 141
 142           if (RTX_FLAG (in_rtx, volatil))
 143             fputs ("/v", outfile);
 144
 145           if (RTX_FLAG (in_rtx, unchanging))
 146             fputs ("/u", outfile);
 147
 148           if (RTX_FLAG (in_rtx, frame_related))
 149             fputs ("/f", outfile);
 150
 151           if (RTX_FLAG (in_rtx, jump))
 152             fputs ("/j", outfile);
 153
 154           if (RTX_FLAG (in_rtx, call))
 155             fputs ("/c", outfile);
 156
 157           if (RTX_FLAG (in_rtx, return_val))
 158             fputs ("/i", outfile);
 159
 160           /* Print REG_NOTE names for EXPR_LIST and INSN_LIST.  */
 161           if ((GET_CODE (in_rtx) == EXPR_LIST
 162                || GET_CODE (in_rtx) == INSN_LIST)
 163               && (int)GET_MODE (in_rtx) < REG_NOTE_MAX)
 164             fprintf (outfile, ":%s",
 165                      GET_REG_NOTE_NAME (GET_MODE (in_rtx)));
 166
 167           /* For other rtl, print the mode if it's not VOID.  */
 168           else if (GET_MODE (in_rtx) != VOIDmode)
 169             fprintf (outfile, ":%s", GET_MODE_NAME (GET_MODE (in_rtx)));
 170
 171 #ifndef GENERATOR_FILE
 172           if (GET_CODE (in_rtx) == VAR_LOCATION)
 173             {
 174               if (TREE_CODE (PAT_VAR_LOCATION_DECL (in_rtx)) == STRING_CST)
 175                 fputs (" <debug string placeholder>", outfile);
 176               else
 177                 print_mem_expr (outfile, PAT_VAR_LOCATION_DECL (in_rtx));
 178               fputc (' ', outfile);
 179               print_rtx (PAT_VAR_LOCATION_LOC (in_rtx));
 180               if (PAT_VAR_LOCATION_STATUS (in_rtx)
 181                   == VAR_INIT_STATUS_UNINITIALIZED)
 182                 fprintf (outfile, " [uninit]");
 183               sawclose = 1;
 184               i = GET_RTX_LENGTH (VAR_LOCATION);
 185             }
 186 #endif
 187         }
 188     }
 189
 190 #ifndef GENERATOR_FILE
 191   if (GET_CODE (in_rtx) == CONST_DOUBLE && FLOAT_MODE_P (GET_MODE (in_rtx)))
 192     i = 5;
 193 #endif
 194
 195   /* Get the format string and skip the first elements if we have handled
 196      them already.  */
 197   format_ptr = GET_RTX_FORMAT (GET_CODE (in_rtx)) + i;
 198   for (; i < GET_RTX_LENGTH (GET_CODE (in_rtx)); i++)
 199     switch (*format_ptr++)
 200       {
 201         const char *str;
 202
 203       case 'T':
 204         str = XTMPL (in_rtx, i);
 205         goto string;
 206
 207       case 'S':
 208       case 's':
 209         str = XSTR (in_rtx, i);
 210       string:
 211
 212         if (str == 0)
 213           fputs (dump_for_graph ? " \\\"\\\"" : " \"\"", outfile);
 214         else
 215           {
 216             if (dump_for_graph)
 217               fprintf (outfile, " (\\\"%s\\\")", str);
 218             else
 219               fprintf (outfile, " (\"%s\")", str);
 220           }
 221         sawclose = 1;
 222         break;
 223
 224         /* 0 indicates a field for internal use that should not be printed.
 225            An exception is the third field of a NOTE, where it indicates
 226            that the field has several different valid contents.  */
 227       case '0':
 228         if (i == 1 && REG_P (in_rtx))
 229           {
 230             if (REGNO (in_rtx) != ORIGINAL_REGNO (in_rtx))
 231               fprintf (outfile, " [%d]", ORIGINAL_REGNO (in_rtx));
 232           }
 233 #ifndef GENERATOR_FILE
 234         else if (i == 1 && GET_CODE (in_rtx) == SYMBOL_REF)
 235           {
 236             int flags = SYMBOL_REF_FLAGS (in_rtx);
 237             if (flags)
 238               fprintf (outfile, " [flags 0x%x]", flags);
 239           }
 240         else if (i == 2 && GET_CODE (in_rtx) == SYMBOL_REF)
 241           {
 242             tree decl = SYMBOL_REF_DECL (in_rtx);
 243             if (decl)
 244               print_node_brief (outfile, "", decl, 0);
 245           }
 246 #endif
 247         else if (i == 4 && NOTE_P (in_rtx))
 248           {
 249             switch (NOTE_KIND (in_rtx))
 250               {
 251               case NOTE_INSN_EH_REGION_BEG:
 252               case NOTE_INSN_EH_REGION_END:
 253                 if (flag_dump_unnumbered)
 254                   fprintf (outfile, " #");
 255                 else
 256                   fprintf (outfile, " %d", NOTE_EH_HANDLER (in_rtx));
 257                 sawclose = 1;
 258                 break;
 259
 260               case NOTE_INSN_BLOCK_BEG:
 261               case NOTE_INSN_BLOCK_END:
 262 #ifndef GENERATOR_FILE
 263                 dump_addr (outfile, " ", NOTE_BLOCK (in_rtx));
 264 #endif
 265                 sawclose = 1;
 266                 break;
 267
 268               case NOTE_INSN_BASIC_BLOCK:
 269                 {
 270 #ifndef GENERATOR_FILE
 271                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 272                   if (bb != 0)
 273                     fprintf (outfile, " [bb %d]", bb->index);
 274 #endif
 275                   break;
 276                 }
 277
 278               case NOTE_INSN_DELETED_LABEL:
 279                 {
 280                   const char *label = NOTE_DELETED_LABEL_NAME (in_rtx);
 281                   if (label)
 282                     fprintf (outfile, " (\"%s\")", label);
 283                   else
 284                     fprintf (outfile, " \"\"");
 285                 }
 286                 break;
 287
 288               case NOTE_INSN_SWITCH_TEXT_SECTIONS:
 289                 {
 290 #ifndef GENERATOR_FILE
 291                   basic_block bb = NOTE_BASIC_BLOCK (in_rtx);
 292                   if (bb != 0)
 293                     fprintf (outfile, " [bb %d]", bb->index);
 294 #endif
 295                   break;
 296                 }
 297
 298               case NOTE_INSN_VAR_LOCATION:
 299 #ifndef GENERATOR_FILE
 300                 fputc (' ', outfile);
 301                 print_rtx (NOTE_VAR_LOCATION (in_rtx));
 302 #endif
 303                 break;
 304
 305               default:
 306                 break;
 307               }
 308           }
 309         else if (i == 8 && JUMP_P (in_rtx) && JUMP_LABEL (in_rtx) != NULL)
 310           /* Output the JUMP_LABEL reference.  */
 311           fprintf (outfile, "\n%s%*s -> %d", print_rtx_head, indent * 2, "",
 312                    INSN_UID (JUMP_LABEL (in_rtx)));
 313         else if (i == 0 && GET_CODE (in_rtx) == VALUE)
 314           {
 315 #ifndef GENERATOR_FILE
 316             cselib_val *val = CSELIB_VAL_PTR (in_rtx);
 317
 318             fprintf (outfile, " %i", val->value);
 319             dump_addr (outfile, " @", in_rtx);
 320             dump_addr (outfile, "/", (void*)val);
 321 #endif
 322           }
 323         else if (i == 0 && GET_CODE (in_rtx) == DEBUG_EXPR)
 324           {
 325 #ifndef GENERATOR_FILE
 326             fprintf (outfile, " D#%i",
 327                      DEBUG_TEMP_UID (DEBUG_EXPR_TREE_DECL (in_rtx)));
 328 #endif
 329           }
 330         break;
 331
 332       case 'e':
 333       do_e:
 334         indent += 2;
 335         if (!sawclose)
 336           fprintf (outfile, " ");
 337         print_rtx (XEXP (in_rtx, i));
 338         indent -= 2;
 339         break;
 340
 341       case 'E':
 342       case 'V':
 343         indent += 2;
 344         if (sawclose)
 345           {
 346             fprintf (outfile, "\n%s%*s",
 347                      print_rtx_head, indent * 2, "");
 348             sawclose = 0;
 349           }
 350         fputs (" [", outfile);
 351         if (NULL != XVEC (in_rtx, i))
 352           {
 353             indent += 2;
 354             if (XVECLEN (in_rtx, i))
 355               sawclose = 1;
 356
 357             for (j = 0; j < XVECLEN (in_rtx, i); j++)
 358               print_rtx (XVECEXP (in_rtx, i, j));
 359
 360             indent -= 2;
 361           }
 362         if (sawclose)
 363           fprintf (outfile, "\n%s%*s", print_rtx_head, indent * 2, "");
 364
 365         fputs ("]", outfile);
 366         sawclose = 1;
 367         indent -= 2;
 368         break;
 369
 370       case 'w':
 371         if (! flag_simple)
 372           fprintf (outfile, " ");
 373         fprintf (outfile, HOST_WIDE_INT_PRINT_DEC, XWINT (in_rtx, i));
 374         if (! flag_simple)
 375           fprintf (outfile, " [" HOST_WIDE_INT_PRINT_HEX "]",
 376                    (unsigned HOST_WIDE_INT) XWINT (in_rtx, i));
 377         break;
 378
 379       case 'i':
 380         if (i == 4 && INSN_P (in_rtx))
 381           {
 382 #ifndef GENERATOR_FILE
 383             /*  Pretty-print insn locators.  Ignore scoping as it is mostly
 384                 redundant with line number information and do not print anything
 385                 when there is no location information available.  */
 386             if (INSN_LOCATOR (in_rtx) && insn_file (in_rtx))
 387               fprintf(outfile, " %s:%i", insn_file (in_rtx), insn_line (in_rtx));
 388 #endif
 389           }
 390         else if (i == 6 && GET_CODE (in_rtx) == ASM_OPERANDS)
 391           {
 392 #ifndef GENERATOR_FILE
 393             fprintf (outfile, " %s:%i",
 394                      locator_file (ASM_OPERANDS_SOURCE_LOCATION (in_rtx)),
 395                      locator_line (ASM_OPERANDS_SOURCE_LOCATION (in_rtx)));
 396 #endif
 397           }
 398         else if (i == 1 && GET_CODE (in_rtx) == ASM_INPUT)
 399           {
 400 #ifndef GENERATOR_FILE
 401             fprintf (outfile, " %s:%i",
 402                      locator_file (ASM_INPUT_SOURCE_LOCATION (in_rtx)),
 403                      locator_line (ASM_INPUT_SOURCE_LOCATION (in_rtx)));
 404 #endif
 405           }
 406         else if (i == 6 && NOTE_P (in_rtx))
 407           {
 408             /* This field is only used for NOTE_INSN_DELETED_LABEL, and
 409                other times often contains garbage from INSN->NOTE death.  */
 410             if (NOTE_KIND (in_rtx) == NOTE_INSN_DELETED_LABEL)
 411               fprintf (outfile, " %d",  XINT (in_rtx, i));
 412           }
 413         else
 414           {
 415             int value = XINT (in_rtx, i);
 416             const char *name;
 417
 418 #ifndef GENERATOR_FILE
 419             if (REG_P (in_rtx) && value < FIRST_PSEUDO_REGISTER)
 420               fprintf (outfile, " %d %s", REGNO (in_rtx),
 421                        reg_names[REGNO (in_rtx)]);
 422             else if (REG_P (in_rtx)
 423                      && value <= LAST_VIRTUAL_REGISTER)
 424               {
 425                 if (value == VIRTUAL_INCOMING_ARGS_REGNUM)
 426                   fprintf (outfile, " %d virtual-incoming-args", value);
 427                 else if (value == VIRTUAL_STACK_VARS_REGNUM)
 428                   fprintf (outfile, " %d virtual-stack-vars", value);
 429                 else if (value == VIRTUAL_STACK_DYNAMIC_REGNUM)
 430                   fprintf (outfile, " %d virtual-stack-dynamic", value);
 431                 else if (value == VIRTUAL_OUTGOING_ARGS_REGNUM)
 432                   fprintf (outfile, " %d virtual-outgoing-args", value);
 433                 else if (value == VIRTUAL_CFA_REGNUM)
 434                   fprintf (outfile, " %d virtual-cfa", value);
 435                 else
 436                   fprintf (outfile, " %d virtual-reg-%d", value,
 437                            value-FIRST_VIRTUAL_REGISTER);
 438               }
 439             else
 440 #endif
 441               if (flag_dump_unnumbered
 442                      && (is_insn || NOTE_P (in_rtx)))
 443               fputc ('#', outfile);
 444             else
 445               fprintf (outfile, " %d", value);
 446
 447 #ifndef GENERATOR_FILE
 448             if (REG_P (in_rtx) && REG_ATTRS (in_rtx))
 449               {
 450                 fputs (" [", outfile);
 451                 if (ORIGINAL_REGNO (in_rtx) != REGNO (in_rtx))
 452                   fprintf (outfile, "orig:%i", ORIGINAL_REGNO (in_rtx));
 453                 if (REG_EXPR (in_rtx))
 454                   print_mem_expr (outfile, REG_EXPR (in_rtx));
 455
 456                 if (REG_OFFSET (in_rtx))
 457                   fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 458                            REG_OFFSET (in_rtx));
 459                 fputs (" ]", outfile);
 460               }
 461 #endif
 462
 463             if (is_insn && &INSN_CODE (in_rtx) == &XINT (in_rtx, i)
 464                 && XINT (in_rtx, i) >= 0
 465                 && (name = get_insn_name (XINT (in_rtx, i))) != NULL)
 466               fprintf (outfile, " {%s}", name);
 467             sawclose = 0;
 468           }
 469         break;
 470
 471       /* Print NOTE_INSN names rather than integer codes.  */
 472
 473       case 'n':
 474         fprintf (outfile, " %s", GET_NOTE_INSN_NAME (XINT (in_rtx, i)));
 475         sawclose = 0;
 476         break;
 477
 478       case 'u':
 479         if (XEXP (in_rtx, i) != NULL)
 480           {
 481             rtx sub = XEXP (in_rtx, i);
 482             enum rtx_code subc = GET_CODE (sub);
 483
 484             if (GET_CODE (in_rtx) == LABEL_REF)
 485               {
 486                 if (subc == NOTE
 487                     && NOTE_KIND (sub) == NOTE_INSN_DELETED_LABEL)
 488                   {
 489                     if (flag_dump_unnumbered)
 490                       fprintf (outfile, " [# deleted]");
 491                     else
 492                       fprintf (outfile, " [%d deleted]", INSN_UID (sub));
 493                     sawclose = 0;
 494                     break;
 495                   }
 496
 497                 if (subc != CODE_LABEL)
 498                   goto do_e;
 499               }
 500
 501             if (flag_dump_unnumbered
 502                 || (flag_dump_unnumbered_links && (i == 1 || i == 2)
 503                     && (INSN_P (in_rtx) || NOTE_P (in_rtx)
 504                         || LABEL_P (in_rtx) || BARRIER_P (in_rtx))))
 505               fputs (" #", outfile);
 506             else
 507               fprintf (outfile, " %d", INSN_UID (sub));
 508           }
 509         else
 510           fputs (" 0", outfile);
 511         sawclose = 0;
 512         break;
 513
 514       case 'b':
 515 #ifndef GENERATOR_FILE
 516         if (XBITMAP (in_rtx, i) == NULL)
 517           fputs (" {null}", outfile);
 518         else
 519           bitmap_print (outfile, XBITMAP (in_rtx, i), " {", "}");
 520 #endif
 521         sawclose = 0;
 522         break;
 523
 524       case 't':
 525 #ifndef GENERATOR_FILE
 526         dump_addr (outfile, " ", XTREE (in_rtx, i));
 527 #endif
 528         break;
 529
 530       case '*':
 531         fputs (" Unknown", outfile);
 532         sawclose = 0;
 533         break;
 534
 535       case 'B':
 536 #ifndef GENERATOR_FILE
 537         if (XBBDEF (in_rtx, i))
 538           fprintf (outfile, " %i", XBBDEF (in_rtx, i)->index);
 539 #endif
 540         break;
 541
 542       default:
 543         gcc_unreachable ();
 544       }
 545
 546   switch (GET_CODE (in_rtx))
 547     {
 548 #ifndef GENERATOR_FILE
 549     case MEM:
 550       fprintf (outfile, " [" HOST_WIDE_INT_PRINT_DEC,
 551                (HOST_WIDE_INT) MEM_ALIAS_SET (in_rtx));
 552
 553       if (MEM_EXPR (in_rtx))
 554         print_mem_expr (outfile, MEM_EXPR (in_rtx));
 555
 556       if (MEM_OFFSET (in_rtx))
 557         fprintf (outfile, "+" HOST_WIDE_INT_PRINT_DEC,
 558                  INTVAL (MEM_OFFSET (in_rtx)));
 559
 560       if (MEM_SIZE (in_rtx))
 561         fprintf (outfile, " S" HOST_WIDE_INT_PRINT_DEC,
 562                  INTVAL (MEM_SIZE (in_rtx)));
 563
 564       if (MEM_ALIGN (in_rtx) != 1)
 565         fprintf (outfile, " A%u", MEM_ALIGN (in_rtx));
 566
 567       if (!ADDR_SPACE_GENERIC_P (MEM_ADDR_SPACE (in_rtx)))
 568         fprintf (outfile, " AS%u", MEM_ADDR_SPACE (in_rtx));
 569
 570       fputc (']', outfile);
 571       break;
 572
 573     case CONST_DOUBLE:
 574       if (FLOAT_MODE_P (GET_MODE (in_rtx)))
 575         {
 576           char s[60];
 577
 578           real_to_decimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 579                            sizeof (s), 0, 1);
 580           fprintf (outfile, " %s", s);
 581
 582           real_to_hexadecimal (s, CONST_DOUBLE_REAL_VALUE (in_rtx),
 583                                sizeof (s), 0, 1);
 584           fprintf (outfile, " [%s]", s);
 585         }
 586       break;
 587 #endif
 588
 589     case CODE_LABEL:
 590       fprintf (outfile, " [%d uses]", LABEL_NUSES (in_rtx));
 591       switch (LABEL_KIND (in_rtx))
 592         {
 593           case LABEL_NORMAL: break;
 594           case LABEL_STATIC_ENTRY: fputs (" [entry]", outfile); break;
 595           case LABEL_GLOBAL_ENTRY: fputs (" [global entry]", outfile); break;
 596           case LABEL_WEAK_ENTRY: fputs (" [weak entry]", outfile); break;
 597           default: gcc_unreachable ();
 598         }
 599       break;
 600
 601     default:
 602       break;
 603     }
 604
 605   if (dump_for_graph
 606       && (is_insn || NOTE_P (in_rtx)
 607           || LABEL_P (in_rtx) || BARRIER_P (in_rtx)))
 608     sawclose = 0;
 609   else
 610     {
 611       fputc (')', outfile);
 612       sawclose = 1;
 613     }
 614 }
 615
 616 /* Print an rtx on the current line of FILE.  Initially indent IND
 617    characters.  */
 618
 619 void
 620 print_inline_rtx (FILE *outf, const_rtx x, int ind)
 621 {
 622   int oldsaw = sawclose;
 623   int oldindent = indent;
 624
 625   sawclose = 0;
 626   indent = ind;
 627   outfile = outf;
 628   print_rtx (x);
 629   sawclose = oldsaw;
 630   indent = oldindent;
 631 }
 632
 633 /* Call this function from the debugger to see what X looks like.  */
 634
 635 void
 636 debug_rtx (const_rtx x)
 637 {
 638   outfile = stderr;
 639   sawclose = 0;
 640   print_rtx (x);
 641   fprintf (stderr, "\n");
 642 }
 643
 644 /* Count of rtx's to print with debug_rtx_list.
 645    This global exists because gdb user defined commands have no arguments.  */
 646
 647 int debug_rtx_count = 0;        /* 0 is treated as equivalent to 1 */
 648
 649 /* Call this function to print list from X on.
 650
 651    N is a count of the rtx's to print. Positive values print from the specified
 652    rtx on.  Negative values print a window around the rtx.
 653    EG: -5 prints 2 rtx's on either side (in addition to the specified rtx).  */
 654
 655 void
 656 debug_rtx_list (const_rtx x, int n)
 657 {
 658   int i,count;
 659   const_rtx insn;
 660
 661   count = n == 0 ? 1 : n < 0 ? -n : n;
 662
 663   /* If we are printing a window, back up to the start.  */
 664
 665   if (n < 0)
 666     for (i = count / 2; i > 0; i--)
 667       {
 668         if (PREV_INSN (x) == 0)
 669           break;
 670         x = PREV_INSN (x);
 671       }
 672
 673   for (i = count, insn = x; i > 0 && insn != 0; i--, insn = NEXT_INSN (insn))
 674     {
 675       debug_rtx (insn);
 676       fprintf (stderr, "\n");
 677     }
 678 }
 679
 680 /* Call this function to print an rtx list from START to END inclusive.  */
 681
 682 void
 683 debug_rtx_range (const_rtx start, const_rtx end)
 684 {
 685   while (1)
 686     {
 687       debug_rtx (start);
 688       fprintf (stderr, "\n");
 689       if (!start || start == end)
 690         break;
 691       start = NEXT_INSN (start);
 692     }
 693 }
 694
 695 /* Call this function to search an rtx list to find one with insn uid UID,
 696    and then call debug_rtx_list to print it, using DEBUG_RTX_COUNT.
 697    The found insn is returned to enable further debugging analysis.  */
 698
 699 const_rtx
 700 debug_rtx_find (const_rtx x, int uid)
 701 {
 702   while (x != 0 && INSN_UID (x) != uid)
 703     x = NEXT_INSN (x);
 704   if (x != 0)
 705     {
 706       debug_rtx_list (x, debug_rtx_count);
 707       return x;
 708     }
 709   else
 710     {
 711       fprintf (stderr, "insn uid %d not found\n", uid);
 712       return 0;
 713     }
 714 }
 715
 716 /* External entry point for printing a chain of insns
 717    starting with RTX_FIRST onto file OUTF.
 718    A blank line separates insns.
 719
 720    If RTX_FIRST is not an insn, then it alone is printed, with no newline.  */
 721
 722 void
 723 print_rtl (FILE *outf, const_rtx rtx_first)
 724 {
 725   const_rtx tmp_rtx;
 726
 727   outfile = outf;
 728   sawclose = 0;
 729
 730   if (rtx_first == 0)
 731     {
 732       fputs (print_rtx_head, outf);
 733       fputs ("(nil)\n", outf);
 734     }
 735   else
 736     switch (GET_CODE (rtx_first))
 737       {
 738       case INSN:
 739       case JUMP_INSN:
 740       case CALL_INSN:
 741       case NOTE:
 742       case CODE_LABEL:
 743       case BARRIER:
 744         for (tmp_rtx = rtx_first; tmp_rtx != 0; tmp_rtx = NEXT_INSN (tmp_rtx))
 745           {
 746             fputs (print_rtx_head, outfile);
 747             print_rtx (tmp_rtx);
 748             fprintf (outfile, "\n");
 749           }
 750         break;
 751
 752       default:
 753         fputs (print_rtx_head, outfile);
 754         print_rtx (rtx_first);
 755       }
 756 }
 757
 758 /* Like print_rtx, except specify a file.  */
 759 /* Return nonzero if we actually printed anything.  */
 760
 761 int
 762 print_rtl_single (FILE *outf, const_rtx x)
 763 {
 764   outfile = outf;
 765   sawclose = 0;
 766   fputs (print_rtx_head, outfile);
 767   print_rtx (x);
 768   putc ('\n', outf);
 769   return 1;
 770 }
 771
 772
 773 /* Like print_rtl except without all the detail; for example,
 774    if RTX is a CONST_INT then print in decimal format.  */
 775
 776 void
 777 print_simple_rtl (FILE *outf, const_rtx x)
 778 {
 779   flag_simple = 1;
 780   print_rtl (outf, x);
 781   flag_simple = 0;
 782 }