gcc/bitmap.c

   1 /* Functions to support general ended bitmaps.
   2    Copyright (C) 1997, 1998, 1999, 2000, 2001, 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 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "rtl.h"
  27 #include "flags.h"
  28 #include "obstack.h"
  29 #include "ggc.h"
  30 #include "bitmap.h"
  31
  32 /* Obstack to allocate bitmap elements from.  */
  33 static struct obstack bitmap_obstack;
  34 static int bitmap_obstack_init = FALSE;
  35 \f
  36 #ifndef INLINE
  37 #ifndef __GNUC__
  38 #define INLINE
  39 #else
  40 #define INLINE __inline__
  41 #endif
  42 #endif
  43
  44 /* Global data */
  45 bitmap_element bitmap_zero_bits;        /* An element of all zero bits.  */
  46 static bitmap_element *bitmap_free;     /* Freelist of bitmap elements.  */
  47 static GTY((deletable (""))) bitmap_element *bitmap_ggc_free;
  48
  49 static void bitmap_elem_to_freelist (bitmap, bitmap_element *);
  50 static void bitmap_element_free (bitmap, bitmap_element *);
  51 static bitmap_element *bitmap_element_allocate (bitmap);
  52 static int bitmap_element_zerop (bitmap_element *);
  53 static void bitmap_element_link (bitmap, bitmap_element *);
  54 static bitmap_element *bitmap_find_bit (bitmap, unsigned int);
  55 \f
  56 /* Add ELEM to the appropriate freelist.  */
  57 static INLINE void
  58 bitmap_elem_to_freelist (bitmap head, bitmap_element *elt)
  59 {
  60   if (head->using_obstack)
  61     {
  62       elt->next = bitmap_free;
  63       bitmap_free = elt;
  64     }
  65   else
  66     {
  67       elt->next = bitmap_ggc_free;
  68       bitmap_ggc_free = elt;
  69     }
  70 }
  71
  72 /* Free a bitmap element.  Since these are allocated off the
  73    bitmap_obstack, "free" actually means "put onto the freelist".  */
  74
  75 static INLINE void
  76 bitmap_element_free (bitmap head, bitmap_element *elt)
  77 {
  78   bitmap_element *next = elt->next;
  79   bitmap_element *prev = elt->prev;
  80
  81   if (prev)
  82     prev->next = next;
  83
  84   if (next)
  85     next->prev = prev;
  86
  87   if (head->first == elt)
  88     head->first = next;
  89
  90   /* Since the first thing we try is to insert before current,
  91      make current the next entry in preference to the previous.  */
  92   if (head->current == elt)
  93     {
  94       head->current = next != 0 ? next : prev;
  95       if (head->current)
  96         head->indx = head->current->indx;
  97     }
  98   bitmap_elem_to_freelist (head, elt);
  99 }
 100 \f
 101 /* Allocate a bitmap element.  The bits are cleared, but nothing else is.  */
 102
 103 static INLINE bitmap_element *
 104 bitmap_element_allocate (bitmap head)
 105 {
 106   bitmap_element *element;
 107
 108   if (head->using_obstack)
 109     {
 110       if (bitmap_free != 0)
 111         {
 112           element = bitmap_free;
 113           bitmap_free = element->next;
 114         }
 115       else
 116         {
 117           /* We can't use gcc_obstack_init to initialize the obstack since
 118              print-rtl.c now calls bitmap functions, and bitmap is linked
 119              into the gen* functions.  */
 120           if (!bitmap_obstack_init)
 121             {
 122               bitmap_obstack_init = TRUE;
 123
 124 #if !defined(__GNUC__) || (__GNUC__ < 2)
 125 #define __alignof__(type) 0
 126 #endif
 127
 128               obstack_specify_allocation (&bitmap_obstack, OBSTACK_CHUNK_SIZE,
 129                                           __alignof__ (bitmap_element),
 130                                           obstack_chunk_alloc,
 131                                           obstack_chunk_free);
 132             }
 133
 134           element = obstack_alloc (&bitmap_obstack, sizeof (bitmap_element));
 135         }
 136     }
 137   else
 138     {
 139       if (bitmap_ggc_free != NULL)
 140         {
 141           element = bitmap_ggc_free;
 142           bitmap_ggc_free = element->next;
 143         }
 144       else
 145         element = ggc_alloc (sizeof (bitmap_element));
 146     }
 147
 148   memset (element->bits, 0, sizeof (element->bits));
 149
 150   return element;
 151 }
 152
 153 /* Release any memory allocated by bitmaps.  */
 154
 155 void
 156 bitmap_release_memory (void)
 157 {
 158   bitmap_free = 0;
 159   if (bitmap_obstack_init)
 160     {
 161       bitmap_obstack_init = FALSE;
 162       obstack_free (&bitmap_obstack, NULL);
 163     }
 164 }
 165
 166 /* Return nonzero if all bits in an element are zero.  */
 167
 168 static INLINE int
 169 bitmap_element_zerop (bitmap_element *element)
 170 {
 171 #if BITMAP_ELEMENT_WORDS == 2
 172   return (element->bits[0] | element->bits[1]) == 0;
 173 #else
 174   int i;
 175
 176   for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
 177     if (element->bits[i] != 0)
 178       return 0;
 179
 180   return 1;
 181 #endif
 182 }
 183 \f
 184 /* Link the bitmap element into the current bitmap linked list.  */
 185
 186 static INLINE void
 187 bitmap_element_link (bitmap head, bitmap_element *element)
 188 {
 189   unsigned int indx = element->indx;
 190   bitmap_element *ptr;
 191
 192   /* If this is the first and only element, set it in.  */
 193   if (head->first == 0)
 194     {
 195       element->next = element->prev = 0;
 196       head->first = element;
 197     }
 198
 199   /* If this index is less than that of the current element, it goes someplace
 200      before the current element.  */
 201   else if (indx < head->indx)
 202     {
 203       for (ptr = head->current;
 204            ptr->prev != 0 && ptr->prev->indx > indx;
 205            ptr = ptr->prev)
 206         ;
 207
 208       if (ptr->prev)
 209         ptr->prev->next = element;
 210       else
 211         head->first = element;
 212
 213       element->prev = ptr->prev;
 214       element->next = ptr;
 215       ptr->prev = element;
 216     }
 217
 218   /* Otherwise, it must go someplace after the current element.  */
 219   else
 220     {
 221       for (ptr = head->current;
 222            ptr->next != 0 && ptr->next->indx < indx;
 223            ptr = ptr->next)
 224         ;
 225
 226       if (ptr->next)
 227         ptr->next->prev = element;
 228
 229       element->next = ptr->next;
 230       element->prev = ptr;
 231       ptr->next = element;
 232     }
 233
 234   /* Set up so this is the first element searched.  */
 235   head->current = element;
 236   head->indx = indx;
 237 }
 238 \f
 239 /* Clear a bitmap by freeing the linked list.  */
 240
 241 INLINE void
 242 bitmap_clear (bitmap head)
 243 {
 244   bitmap_element *element, *next;
 245
 246   for (element = head->first; element != 0; element = next)
 247     {
 248       next = element->next;
 249       bitmap_elem_to_freelist (head, element);
 250     }
 251
 252   head->first = head->current = 0;
 253 }
 254 \f
 255 /* Copy a bitmap to another bitmap.  */
 256
 257 void
 258 bitmap_copy (bitmap to, bitmap from)
 259 {
 260   bitmap_element *from_ptr, *to_ptr = 0;
 261 #if BITMAP_ELEMENT_WORDS != 2
 262   int i;
 263 #endif
 264
 265   bitmap_clear (to);
 266
 267   /* Copy elements in forward direction one at a time.  */
 268   for (from_ptr = from->first; from_ptr; from_ptr = from_ptr->next)
 269     {
 270       bitmap_element *to_elt = bitmap_element_allocate (to);
 271
 272       to_elt->indx = from_ptr->indx;
 273
 274 #if BITMAP_ELEMENT_WORDS == 2
 275       to_elt->bits[0] = from_ptr->bits[0];
 276       to_elt->bits[1] = from_ptr->bits[1];
 277 #else
 278       for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
 279         to_elt->bits[i] = from_ptr->bits[i];
 280 #endif
 281
 282       /* Here we have a special case of bitmap_element_link, for the case
 283          where we know the links are being entered in sequence.  */
 284       if (to_ptr == 0)
 285         {
 286           to->first = to->current = to_elt;
 287           to->indx = from_ptr->indx;
 288           to_elt->next = to_elt->prev = 0;
 289         }
 290       else
 291         {
 292           to_elt->prev = to_ptr;
 293           to_elt->next = 0;
 294           to_ptr->next = to_elt;
 295         }
 296
 297       to_ptr = to_elt;
 298     }
 299 }
 300 \f
 301 /* Find a bitmap element that would hold a bitmap's bit.
 302    Update the `current' field even if we can't find an element that
 303    would hold the bitmap's bit to make eventual allocation
 304    faster.  */
 305
 306 static INLINE bitmap_element *
 307 bitmap_find_bit (bitmap head, unsigned int bit)
 308 {
 309   bitmap_element *element;
 310   unsigned int indx = bit / BITMAP_ELEMENT_ALL_BITS;
 311
 312   if (head->current == 0
 313       || head->indx == indx)
 314     return head->current;
 315
 316   if (head->indx > indx)
 317     for (element = head->current;
 318          element->prev != 0 && element->indx > indx;
 319          element = element->prev)
 320       ;
 321
 322   else
 323     for (element = head->current;
 324          element->next != 0 && element->indx < indx;
 325          element = element->next)
 326       ;
 327
 328   /* `element' is the nearest to the one we want.  If it's not the one we
 329      want, the one we want doesn't exist.  */
 330   head->current = element;
 331   head->indx = element->indx;
 332   if (element != 0 && element->indx != indx)
 333     element = 0;
 334
 335   return element;
 336 }
 337 \f
 338 /* Clear a single bit in a bitmap.  */
 339
 340 void
 341 bitmap_clear_bit (bitmap head, int bit)
 342 {
 343   bitmap_element *ptr = bitmap_find_bit (head, bit);
 344
 345   if (ptr != 0)
 346     {
 347       unsigned bit_num  = bit % BITMAP_WORD_BITS;
 348       unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS;
 349       ptr->bits[word_num] &= ~ (((BITMAP_WORD) 1) << bit_num);
 350
 351       /* If we cleared the entire word, free up the element.  */
 352       if (bitmap_element_zerop (ptr))
 353         bitmap_element_free (head, ptr);
 354     }
 355 }
 356
 357 /* Set a single bit in a bitmap.  */
 358
 359 void
 360 bitmap_set_bit (bitmap head, int bit)
 361 {
 362   bitmap_element *ptr = bitmap_find_bit (head, bit);
 363   unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS;
 364   unsigned bit_num  = bit % BITMAP_WORD_BITS;
 365   BITMAP_WORD bit_val = ((BITMAP_WORD) 1) << bit_num;
 366
 367   if (ptr == 0)
 368     {
 369       ptr = bitmap_element_allocate (head);
 370       ptr->indx = bit / BITMAP_ELEMENT_ALL_BITS;
 371       ptr->bits[word_num] = bit_val;
 372       bitmap_element_link (head, ptr);
 373     }
 374   else
 375     ptr->bits[word_num] |= bit_val;
 376 }
 377
 378 /* Return whether a bit is set within a bitmap.  */
 379
 380 int
 381 bitmap_bit_p (bitmap head, int bit)
 382 {
 383   bitmap_element *ptr;
 384   unsigned bit_num;
 385   unsigned word_num;
 386
 387   ptr = bitmap_find_bit (head, bit);
 388   if (ptr == 0)
 389     return 0;
 390
 391   bit_num = bit % BITMAP_WORD_BITS;
 392   word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS;
 393
 394   return (ptr->bits[word_num] >> bit_num) & 1;
 395 }
 396 \f
 397 /* Return the bit number of the first set bit in the bitmap, or -1
 398    if the bitmap is empty.  */
 399
 400 int
 401 bitmap_first_set_bit (bitmap a)
 402 {
 403   bitmap_element *ptr = a->first;
 404   BITMAP_WORD word;
 405   unsigned word_num, bit_num;
 406
 407   if (ptr == NULL)
 408     return -1;
 409
 410 #if BITMAP_ELEMENT_WORDS == 2
 411   word_num = 0, word = ptr->bits[0];
 412   if (word == 0)
 413     word_num = 1, word = ptr->bits[1];
 414 #else
 415   for (word_num = 0; word_num < BITMAP_ELEMENT_WORDS; ++word_num)
 416     if ((word = ptr->bits[word_num]) != 0)
 417       break;
 418 #endif
 419
 420   /* Binary search for the first set bit.  */
 421   /* ??? It'd be nice to know if ffs or ffsl was available.  */
 422
 423   bit_num = 0;
 424   word = word & -word;
 425
 426 #if nBITMAP_WORD_BITS > 64
 427  #error "Fill out the table."
 428 #endif
 429 #if nBITMAP_WORD_BITS > 32
 430   if ((word & 0xffffffff) == 0)
 431     word >>= 32, bit_num += 32;
 432 #endif
 433   if ((word & 0xffff) == 0)
 434     word >>= 16, bit_num += 16;
 435   if ((word & 0xff) == 0)
 436     word >>= 8, bit_num += 8;
 437   if (word & 0xf0)
 438     bit_num += 4;
 439   if (word & 0xcc)
 440     bit_num += 2;
 441   if (word & 0xaa)
 442     bit_num += 1;
 443
 444   return (ptr->indx * BITMAP_ELEMENT_ALL_BITS
 445           + word_num * BITMAP_WORD_BITS
 446           + bit_num);
 447 }
 448
 449 /* Return the bit number of the last set bit in the bitmap, or -1
 450    if the bitmap is empty.  */
 451
 452 int
 453 bitmap_last_set_bit (bitmap a)
 454 {
 455   bitmap_element *ptr = a->first;
 456   BITMAP_WORD word;
 457   unsigned word_num, bit_num;
 458
 459   if (ptr == NULL)
 460     return -1;
 461
 462   while (ptr->next != NULL)
 463     ptr = ptr->next;
 464
 465 #if BITMAP_ELEMENT_WORDS == 2
 466   word_num = 1, word = ptr->bits[1];
 467   if (word == 0)
 468     word_num = 0, word = ptr->bits[0];
 469 #else
 470   for (word_num = BITMAP_ELEMENT_WORDS; word_num-- > 0; )
 471     if ((word = ptr->bits[word_num]) != 0)
 472       break;
 473 #endif
 474
 475   /* Binary search for the last set bit.  */
 476
 477   bit_num = 0;
 478 #if nBITMAP_WORD_BITS > 64
 479  #error "Fill out the table."
 480 #endif
 481 #if nBITMAP_WORD_BITS > 32
 482   if (word & ~(BITMAP_WORD)0xffffffff)
 483     word >>= 32, bit_num += 32;
 484 #endif
 485   if (word & 0xffff0000)
 486     word >>= 16, bit_num += 16;
 487   if (word & 0xff00)
 488     word >>= 8, bit_num += 8;
 489   if (word & 0xf0)
 490     word >>= 4, bit_num += 4;
 491   if (word & 0xc)
 492     word >>= 2, bit_num += 2;
 493   if (word & 0x2)
 494     bit_num += 1;
 495
 496   return (ptr->indx * BITMAP_ELEMENT_ALL_BITS
 497           + word_num * BITMAP_WORD_BITS
 498           + bit_num);
 499 }
 500 \f
 501 /* Store in bitmap TO the result of combining bitmap FROM1 and FROM2 using
 502    a specific bit manipulation.  Return true if TO changes.  */
 503
 504 int
 505 bitmap_operation (bitmap to, bitmap from1, bitmap from2,
 506                   enum bitmap_bits operation)
 507 {
 508 #define HIGHEST_INDEX (unsigned int) ~0
 509
 510   bitmap_element *from1_ptr = from1->first;
 511   bitmap_element *from2_ptr = from2->first;
 512   unsigned int indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
 513   unsigned int indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
 514   bitmap_element *to_ptr = to->first;
 515   bitmap_element *from1_tmp;
 516   bitmap_element *from2_tmp;
 517   bitmap_element *to_tmp;
 518   unsigned int indx;
 519   int changed = 0;
 520
 521 #if BITMAP_ELEMENT_WORDS == 2
 522 #define DOIT(OP)                                        \
 523   do {                                                  \
 524     BITMAP_WORD t0, t1, f10, f11, f20, f21;             \
 525     f10 = from1_tmp->bits[0];                           \
 526     f20 = from2_tmp->bits[0];                           \
 527     t0 = f10 OP f20;                                    \
 528     changed |= (t0 != to_tmp->bits[0]);                 \
 529     f11 = from1_tmp->bits[1];                           \
 530     f21 = from2_tmp->bits[1];                           \
 531     t1 = f11 OP f21;                                    \
 532     changed |= (t1 != to_tmp->bits[1]);                 \
 533     to_tmp->bits[0] = t0;                               \
 534     to_tmp->bits[1] = t1;                               \
 535   } while (0)
 536 #else
 537 #define DOIT(OP)                                        \
 538   do {                                                  \
 539     BITMAP_WORD t, f1, f2;                              \
 540     int i;                                              \
 541     for (i = 0; i < BITMAP_ELEMENT_WORDS; ++i)          \
 542       {                                                 \
 543         f1 = from1_tmp->bits[i];                        \
 544         f2 = from2_tmp->bits[i];                        \
 545         t = f1 OP f2;                                   \
 546         changed |= (t != to_tmp->bits[i]);              \
 547         to_tmp->bits[i] = t;                            \
 548       }                                                 \
 549   } while (0)
 550 #endif
 551
 552   to->first = to->current = 0;
 553
 554   while (from1_ptr != 0 || from2_ptr != 0)
 555     {
 556       /* Figure out whether we need to substitute zero elements for
 557          missing links.  */
 558       if (indx1 == indx2)
 559         {
 560           indx = indx1;
 561           from1_tmp = from1_ptr;
 562           from2_tmp = from2_ptr;
 563           from1_ptr = from1_ptr->next;
 564           indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
 565           from2_ptr = from2_ptr->next;
 566           indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
 567         }
 568       else if (indx1 < indx2)
 569         {
 570           indx = indx1;
 571           from1_tmp = from1_ptr;
 572           from2_tmp = &bitmap_zero_bits;
 573           from1_ptr = from1_ptr->next;
 574           indx1 = (from1_ptr) ? from1_ptr->indx : HIGHEST_INDEX;
 575         }
 576       else
 577         {
 578           indx = indx2;
 579           from1_tmp = &bitmap_zero_bits;
 580           from2_tmp = from2_ptr;
 581           from2_ptr = from2_ptr->next;
 582           indx2 = (from2_ptr) ? from2_ptr->indx : HIGHEST_INDEX;
 583         }
 584
 585       /* Find the appropriate element from TO.  Begin by discarding
 586          elements that we've skipped.  */
 587       while (to_ptr && to_ptr->indx < indx)
 588         {
 589           changed = 1;
 590           to_tmp = to_ptr;
 591           to_ptr = to_ptr->next;
 592           bitmap_elem_to_freelist (to, to_tmp);
 593         }
 594       if (to_ptr && to_ptr->indx == indx)
 595         {
 596           to_tmp = to_ptr;
 597           to_ptr = to_ptr->next;
 598         }
 599       else
 600         to_tmp = bitmap_element_allocate (to);
 601
 602       /* Do the operation, and if any bits are set, link it into the
 603          linked list.  */
 604       switch (operation)
 605         {
 606         default:
 607           abort ();
 608
 609         case BITMAP_AND:
 610           DOIT (&);
 611           break;
 612
 613         case BITMAP_AND_COMPL:
 614           DOIT (&~);
 615           break;
 616
 617         case BITMAP_IOR:
 618           DOIT (|);
 619           break;
 620         case BITMAP_IOR_COMPL:
 621           DOIT (|~);
 622           break;
 623         case BITMAP_XOR:
 624           DOIT (^);
 625           break;
 626         }
 627
 628       if (! bitmap_element_zerop (to_tmp))
 629         {
 630           to_tmp->indx = indx;
 631           bitmap_element_link (to, to_tmp);
 632         }
 633       else
 634         {
 635           bitmap_elem_to_freelist (to, to_tmp);
 636         }
 637     }
 638
 639   /* If we have elements of TO left over, free the lot.  */
 640   if (to_ptr)
 641     {
 642       changed = 1;
 643       for (to_tmp = to_ptr; to_tmp->next ; to_tmp = to_tmp->next)
 644         continue;
 645       if (to->using_obstack)
 646         {
 647           to_tmp->next = bitmap_free;
 648           bitmap_free = to_ptr;
 649         }
 650       else
 651         {
 652           to_tmp->next = bitmap_ggc_free;
 653           bitmap_ggc_free = to_ptr;
 654         }
 655     }
 656
 657 #undef DOIT
 658
 659   return changed;
 660 }
 661
 662 /* Return true if two bitmaps are identical.  */
 663
 664 int
 665 bitmap_equal_p (bitmap a, bitmap b)
 666 {
 667   bitmap_head c;
 668   int ret;
 669
 670   memset (&c, 0, sizeof (c));
 671   ret = ! bitmap_operation (&c, a, b, BITMAP_XOR);
 672   bitmap_clear (&c);
 673
 674   return ret;
 675 }
 676 \f
 677 /* Or into bitmap TO bitmap FROM1 and'ed with the complement of
 678    bitmap FROM2.  */
 679
 680 void
 681 bitmap_ior_and_compl (bitmap to, bitmap from1, bitmap from2)
 682 {
 683   bitmap_head tmp;
 684
 685   tmp.first = tmp.current = 0;
 686   tmp.using_obstack = 0;
 687
 688   bitmap_operation (&tmp, from1, from2, BITMAP_AND_COMPL);
 689   bitmap_operation (to, to, &tmp, BITMAP_IOR);
 690   bitmap_clear (&tmp);
 691 }
 692
 693 int
 694 bitmap_union_of_diff (bitmap dst, bitmap a, bitmap b, bitmap c)
 695 {
 696   bitmap_head tmp;
 697   int changed;
 698
 699   tmp.first = tmp.current = 0;
 700   tmp.using_obstack = 0;
 701
 702   bitmap_operation (&tmp, b, c, BITMAP_AND_COMPL);
 703   changed = bitmap_operation (dst, &tmp, a, BITMAP_IOR);
 704   bitmap_clear (&tmp);
 705
 706   return changed;
 707 }
 708 \f
 709 /* Initialize a bitmap header.  */
 710
 711 bitmap
 712 bitmap_initialize (bitmap head, int using_obstack)
 713 {
 714   if (head == NULL && ! using_obstack)
 715     head = ggc_alloc (sizeof (*head));
 716
 717   head->first = head->current = 0;
 718   head->using_obstack = using_obstack;
 719
 720   return head;
 721 }
 722 \f
 723 /* Debugging function to print out the contents of a bitmap.  */
 724
 725 void
 726 debug_bitmap_file (FILE *file, bitmap head)
 727 {
 728   bitmap_element *ptr;
 729
 730   fprintf (file, "\nfirst = " HOST_PTR_PRINTF
 731            " current = " HOST_PTR_PRINTF " indx = %u\n",
 732            (void *) head->first, (void *) head->current, head->indx);
 733
 734   for (ptr = head->first; ptr; ptr = ptr->next)
 735     {
 736       unsigned int i, j, col = 26;
 737
 738       fprintf (file, "\t" HOST_PTR_PRINTF " next = " HOST_PTR_PRINTF
 739                " prev = " HOST_PTR_PRINTF " indx = %u\n\t\tbits = {",
 740                (void*) ptr, (void*) ptr->next, (void*) ptr->prev, ptr->indx);
 741
 742       for (i = 0; i < BITMAP_ELEMENT_WORDS; i++)
 743         for (j = 0; j < BITMAP_WORD_BITS; j++)
 744           if ((ptr->bits[i] >> j) & 1)
 745             {
 746               if (col > 70)
 747                 {
 748                   fprintf (file, "\n\t\t\t");
 749                   col = 24;
 750                 }
 751
 752               fprintf (file, " %u", (ptr->indx * BITMAP_ELEMENT_ALL_BITS
 753                                      + i * BITMAP_WORD_BITS + j));
 754               col += 4;
 755             }
 756
 757       fprintf (file, " }\n");
 758     }
 759 }
 760
 761 /* Function to be called from the debugger to print the contents
 762    of a bitmap.  */
 763
 764 void
 765 debug_bitmap (bitmap head)
 766 {
 767   debug_bitmap_file (stdout, head);
 768 }
 769
 770 /* Function to print out the contents of a bitmap.  Unlike debug_bitmap_file,
 771    it does not print anything but the bits.  */
 772
 773 void
 774 bitmap_print (FILE *file, bitmap head, const char *prefix, const char *suffix)
 775 {
 776   const char *comma = "";
 777   int i;
 778
 779   fputs (prefix, file);
 780   EXECUTE_IF_SET_IN_BITMAP (head, 0, i,
 781                             {
 782                               fprintf (file, "%s%d", comma, i);
 783                               comma = ", ";
 784                             });
 785   fputs (suffix, file);
 786 }
 787
 788 #include "gt-bitmap.h"