gcc/sbitmap.h

   1 /* Simple bitmaps.
   2    Copyright (C) 1999 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 /* It's not clear yet whether using bitmap.[ch] will be a win.
  22    It should be straightforward to convert so for now we keep things simple
  23    while more important issues are dealt with.  */
  24
  25 #define SBITMAP_ELT_BITS HOST_BITS_PER_WIDE_INT
  26 #define SBITMAP_ELT_TYPE unsigned HOST_WIDE_INT
  27
  28 typedef struct simple_bitmap_def {
  29   /* Number of bits.  */
  30   int n_bits;
  31   /* Size in elements.  */
  32   int size;
  33   /* Size in bytes.  */
  34   int bytes;
  35   /* The elements.  */
  36   SBITMAP_ELT_TYPE elms[1];
  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 bit_num_ = (MIN) % (unsigned) SBITMAP_ELT_BITS;          \
  62   unsigned int word_num_ = (MIN) / (unsigned) SBITMAP_ELT_BITS;         \
  63   unsigned int size_ = (SBITMAP)->size;                                 \
  64   SBITMAP_ELT_TYPE *ptr_ = (SBITMAP)->elms;                             \
  65                                                                         \
  66   while (word_num_ < size_)                                             \
  67     {                                                                   \
  68       SBITMAP_ELT_TYPE word_ = ptr_[word_num_];                         \
  69       if (word_ != 0)                                                   \
  70         {                                                               \
  71           for (; bit_num_ < SBITMAP_ELT_BITS; ++bit_num_)               \
  72             {                                                           \
  73               SBITMAP_ELT_TYPE mask_ = (SBITMAP_ELT_TYPE)1 << bit_num_; \
  74               if ((word_ & mask_) != 0)                                 \
  75                 {                                                       \
  76                   word_ &= ~mask_;                                      \
  77                   (N) = word_num_ * SBITMAP_ELT_BITS + bit_num_;        \
  78                   CODE;                                                 \
  79                   if (word_ == 0)                                       \
  80                     break;                                              \
  81                 }                                                       \
  82             }                                                           \
  83         }                                                               \
  84       bit_num_ = 0;                                                     \
  85       word_num_++;                                                      \
  86    }                                                                    \
  87 } while (0)
  88
  89 #define sbitmap_free(map)               free(map)
  90 #define sbitmap_vector_free(vec)        free(vec)
  91
  92 extern void dump_sbitmap PROTO ((FILE *, sbitmap));
  93 extern void dump_sbitmap_vector PROTO ((FILE *, const char *, const char *,
  94                                         sbitmap *, int));
  95
  96 extern sbitmap sbitmap_alloc PROTO ((int));
  97 extern sbitmap *sbitmap_vector_alloc PROTO ((int, int));
  98
  99 extern void sbitmap_copy PROTO ((sbitmap, sbitmap));
 100 extern void sbitmap_zero PROTO ((sbitmap));
 101 extern void sbitmap_ones PROTO ((sbitmap));
 102 extern void sbitmap_vector_zero PROTO ((sbitmap *, int));
 103 extern void sbitmap_vector_ones PROTO ((sbitmap *, int));
 104
 105 extern int sbitmap_union_of_diff PROTO ((sbitmap, sbitmap, sbitmap, sbitmap));
 106 extern void sbitmap_difference PROTO ((sbitmap, sbitmap, sbitmap));
 107 extern void sbitmap_not PROTO ((sbitmap, sbitmap));
 108 extern int sbitmap_a_or_b_and_c PROTO ((sbitmap, sbitmap, sbitmap, sbitmap));
 109 extern int sbitmap_a_and_b_or_c PROTO ((sbitmap, sbitmap, sbitmap, sbitmap));
 110 extern int sbitmap_a_and_b PROTO ((sbitmap, sbitmap, sbitmap));
 111 extern int sbitmap_a_or_b PROTO ((sbitmap, sbitmap, sbitmap));
 112
 113 struct int_list;
 114 extern void sbitmap_intersect_of_predsucc PROTO ((sbitmap, sbitmap *,
 115                                                   int, struct int_list **));
 116 #define sbitmap_intersect_of_predecessors  sbitmap_intersect_of_predsucc
 117 #define sbitmap_intersect_of_successors    sbitmap_intersect_of_predsucc
 118
 119 extern void sbitmap_union_of_predsucc PROTO ((sbitmap, sbitmap *, int,
 120                                               struct int_list **));
 121 #define sbitmap_union_of_predecessors  sbitmap_union_of_predsucc
 122 #define sbitmap_union_of_successors    sbitmap_union_of_predsucc