gcc/sbitmap.h

   1 /* Simple bitmaps.
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef _SBITMAP_H
  22 #define _SBITMAP_H 1
  23
  24 /* It's not clear yet whether using bitmap.[ch] will be a win.
  25    It should be straightforward to convert so for now we keep things simple
  26    while more important issues are dealt with.  */
  27
  28 #define SBITMAP_ELT_BITS ((unsigned) HOST_BITS_PER_WIDE_INT)
  29 #define SBITMAP_ELT_TYPE unsigned HOST_WIDE_INT
  30
  31 typedef struct simple_bitmap_def
  32 {
  33   unsigned int n_bits;          /* Number of bits.  */
  34   unsigned int size;            /* Size in elements.  */
  35   unsigned int bytes;           /* Size in bytes.  */
  36   SBITMAP_ELT_TYPE elms[1];     /* The elements.  */
  37 } *sbitmap;
  38
  39 typedef SBITMAP_ELT_TYPE *sbitmap_ptr;
  40
  41 /* Return the set size needed for N elements.  */
  42 #define SBITMAP_SET_SIZE(N) (((N) + SBITMAP_ELT_BITS - 1) / SBITMAP_ELT_BITS)
  43
  44 /* Set bit number bitno in the bitmap.  */
  45 #define SET_BIT(BITMAP, BITNO)                                  \
  46   ((BITMAP)->elms [(BITNO) / SBITMAP_ELT_BITS]                  \
  47    |= (SBITMAP_ELT_TYPE) 1 << (BITNO) % SBITMAP_ELT_BITS)
  48
  49 /* Test if bit number bitno in the bitmap is set.  */
  50 #define TEST_BIT(BITMAP, BITNO) \
  51 ((BITMAP)->elms [(BITNO) / SBITMAP_ELT_BITS] >> (BITNO) % SBITMAP_ELT_BITS & 1)
  52
  53 /* Reset bit number bitno in the bitmap.  */
  54 #define RESET_BIT(BITMAP, BITNO)                                \
  55   ((BITMAP)->elms [(BITNO) / SBITMAP_ELT_BITS]                  \
  56    &= ~((SBITMAP_ELT_TYPE) 1 << (BITNO) % SBITMAP_ELT_BITS))
  57
  58 /* Loop over all elements of SBITSET, starting with MIN.  */
  59 #define EXECUTE_IF_SET_IN_SBITMAP(SBITMAP, MIN, N, CODE)                \
  60 do {                                                                    \
  61   unsigned int word_num_;                                               \
  62   unsigned int bit_num_ = (MIN) % (unsigned int) SBITMAP_ELT_BITS;      \
  63   unsigned int size_ = (SBITMAP)->size;                                 \
  64   SBITMAP_ELT_TYPE *ptr_ = (SBITMAP)->elms;                             \
  65                                                                         \
  66   for (word_num_ = (MIN) / (unsigned int) SBITMAP_ELT_BITS;             \
  67        word_num_ < size_; word_num_++, bit_num_ = 0)                    \
  68     {                                                                   \
  69       SBITMAP_ELT_TYPE word_ = ptr_[word_num_];                         \
  70                                                                         \
  71       if (word_ != 0)                                                   \
  72         for (; bit_num_ < SBITMAP_ELT_BITS; bit_num_++)                 \
  73           {                                                             \
  74             SBITMAP_ELT_TYPE _mask = (SBITMAP_ELT_TYPE)1 << bit_num_;   \
  75                                                                         \
  76             if ((word_ & _mask) != 0)                                   \
  77               {                                                         \
  78                 word_ &= ~ _mask;                                       \
  79                 (N) = word_num_ * SBITMAP_ELT_BITS + bit_num_;          \
  80                 CODE;                                                   \
  81                 if (word_ == 0)                                         \
  82                   break;                                                \
  83               }                                                         \
  84           }                                                             \
  85     }                                                                   \
  86 } while (0)
  87
  88 #define sbitmap_free(MAP)               free(MAP)
  89 #define sbitmap_vector_free(VEC)        free(VEC)
  90
  91 struct int_list;
  92
  93 extern void dump_sbitmap                PARAMS ((FILE *, sbitmap));
  94 extern void dump_sbitmap_vector         PARAMS ((FILE *, const char *,
  95                                                  const char *, sbitmap *,
  96                                                  int));
  97 extern sbitmap sbitmap_alloc            PARAMS ((unsigned int));
  98 extern sbitmap *sbitmap_vector_alloc    PARAMS ((unsigned int, unsigned int));
  99 extern void sbitmap_copy                PARAMS ((sbitmap, sbitmap));
 100 extern void sbitmap_zero                PARAMS ((sbitmap));
 101 extern void sbitmap_ones                PARAMS ((sbitmap));
 102 extern void sbitmap_vector_zero         PARAMS ((sbitmap *, unsigned int));
 103 extern void sbitmap_vector_ones         PARAMS ((sbitmap *, unsigned int));
 104
 105 extern int sbitmap_union_of_diff        PARAMS ((sbitmap, sbitmap, sbitmap,
 106                                                  sbitmap));
 107 extern void sbitmap_difference          PARAMS ((sbitmap, sbitmap, sbitmap));
 108 extern void sbitmap_not                 PARAMS ((sbitmap, sbitmap));
 109 extern int sbitmap_a_or_b_and_c         PARAMS ((sbitmap, sbitmap, sbitmap,
 110                                                  sbitmap));
 111 extern int sbitmap_a_and_b_or_c         PARAMS ((sbitmap, sbitmap, sbitmap,
 112                                                  sbitmap));
 113 extern int sbitmap_a_and_b              PARAMS ((sbitmap, sbitmap, sbitmap));
 114 extern int sbitmap_a_or_b               PARAMS ((sbitmap, sbitmap, sbitmap));
 115 extern int sbitmap_a_subset_b_p         PARAMS ((sbitmap, sbitmap));
 116
 117 extern int sbitmap_first_set_bit        PARAMS ((sbitmap));
 118 extern int sbitmap_last_set_bit         PARAMS ((sbitmap));
 119
 120 extern void sbitmap_intersect_of_predsucc PARAMS ((sbitmap, sbitmap *,
 121                                                   int, struct int_list **));
 122 #define sbitmap_intersect_of_predecessors  sbitmap_intersect_of_predsucc
 123 #define sbitmap_intersect_of_successors    sbitmap_intersect_of_predsucc
 124
 125 extern void sbitmap_union_of_predsucc   PARAMS ((sbitmap, sbitmap *, int,
 126                                                  struct int_list **));
 127 #define sbitmap_union_of_predecessors  sbitmap_union_of_predsucc
 128 #define sbitmap_union_of_successors    sbitmap_union_of_predsucc
 129
 130 /* Intersection and Union of preds/succs using the new flow graph
 131    structure instead of the pred/succ arrays.  */
 132
 133 extern void sbitmap_intersection_of_succs  PARAMS ((sbitmap, sbitmap *, int));
 134 extern void sbitmap_intersection_of_preds  PARAMS ((sbitmap, sbitmap *, int));
 135 extern void sbitmap_union_of_succs         PARAMS ((sbitmap, sbitmap *, int));
 136 extern void sbitmap_union_of_preds         PARAMS ((sbitmap, sbitmap *, int));
 137
 138 extern void debug_sbitmap                  PARAMS ((sbitmap));
 139 #endif /* _SBITMAP_H */