1/* Simple bitmaps.
2   Copyright (C) 1999 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6GNU CC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2, or (at your option)
9any later version.
10
11GNU CC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU CC; see the file COPYING.  If not, write to
18the Free Software Foundation, 59 Temple Place - Suite 330,
19Boston, 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
28typedef 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
39typedef 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)		\
60do {									\
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
92extern void dump_sbitmap PROTO ((FILE *, sbitmap));
93extern void dump_sbitmap_vector PROTO ((FILE *, const char *, const char *,
94					sbitmap *, int));
95
96extern sbitmap sbitmap_alloc PROTO ((int));
97extern sbitmap *sbitmap_vector_alloc PROTO ((int, int));
98
99extern void sbitmap_copy PROTO ((sbitmap, sbitmap));
100extern void sbitmap_zero PROTO ((sbitmap));
101extern void sbitmap_ones PROTO ((sbitmap));
102extern void sbitmap_vector_zero PROTO ((sbitmap *, int));
103extern void sbitmap_vector_ones PROTO ((sbitmap *, int));
104
105extern int sbitmap_union_of_diff PROTO ((sbitmap, sbitmap, sbitmap, sbitmap));
106extern void sbitmap_difference PROTO ((sbitmap, sbitmap, sbitmap));
107extern void sbitmap_not PROTO ((sbitmap, sbitmap));
108extern int sbitmap_a_or_b_and_c PROTO ((sbitmap, sbitmap, sbitmap, sbitmap));
109extern int sbitmap_a_and_b_or_c PROTO ((sbitmap, sbitmap, sbitmap, sbitmap));
110extern int sbitmap_a_and_b PROTO ((sbitmap, sbitmap, sbitmap));
111extern int sbitmap_a_or_b PROTO ((sbitmap, sbitmap, sbitmap));
112
113struct int_list;
114extern 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
119extern 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
123