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/* Simple bitmaps.
Copyright (C) 1999, 2000, 2002, 2003, 2004, 2006, 2007
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_SBITMAP_H
#define GCC_SBITMAP_H
/* It's not clear yet whether using bitmap.[ch] will be a win.
It should be straightforward to convert so for now we keep things simple
while more important issues are dealt with. */
#define SBITMAP_ELT_BITS ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)
#define SBITMAP_ELT_TYPE unsigned HOST_WIDEST_FAST_INT
/* Can't use SBITMAP_ELT_BITS in this macro because it contains a
cast. There is no perfect macro in GCC to test against. This
suffices for roughly 99% of the hosts we run on, and the rest
don't have 256 bit integers. */
#if HOST_BITS_PER_WIDEST_FAST_INT > 255
#error Need to increase size of datatype used for popcount
#endif
typedef struct simple_bitmap_def
{
unsigned char *popcount; /* Population count. */
unsigned int n_bits; /* Number of bits. */
unsigned int size; /* Size in elements. */
SBITMAP_ELT_TYPE elms[1]; /* The elements. */
} *sbitmap;
typedef const struct simple_bitmap_def *const_sbitmap;
typedef SBITMAP_ELT_TYPE *sbitmap_ptr;
typedef const SBITMAP_ELT_TYPE *const_sbitmap_ptr;
/* Return the set size needed for N elements. */
#define SBITMAP_SET_SIZE(N) (((N) + SBITMAP_ELT_BITS - 1) / SBITMAP_ELT_BITS)
#define SBITMAP_SIZE_BYTES(BITMAP) ((BITMAP)->size * sizeof (SBITMAP_ELT_TYPE))
/* Test if bit number bitno in the bitmap is set. */
#define TEST_BIT(BITMAP, BITNO) \
((BITMAP)->elms [(BITNO) / SBITMAP_ELT_BITS] >> (BITNO) % SBITMAP_ELT_BITS & 1)
/* Set bit number BITNO in the sbitmap MAP. Updates population count
if this bitmap has one. */
static inline void
SET_BIT (sbitmap map, unsigned int bitno)
{
if (map->popcount)
{
bool oldbit;
oldbit = TEST_BIT (map, bitno);
if (!oldbit)
map->popcount[bitno / SBITMAP_ELT_BITS]++;
}
map->elms[bitno / SBITMAP_ELT_BITS]
|= (SBITMAP_ELT_TYPE) 1 << (bitno) % SBITMAP_ELT_BITS;
}
/* Reset bit number BITNO in the sbitmap MAP. Updates population
count if this bitmap has one. */
static inline void
RESET_BIT (sbitmap map, unsigned int bitno)
{
if (map->popcount)
{
bool oldbit;
oldbit = TEST_BIT (map, bitno);
if (oldbit)
map->popcount[bitno / SBITMAP_ELT_BITS]--;
}
map->elms[bitno / SBITMAP_ELT_BITS]
&= ~((SBITMAP_ELT_TYPE) 1 << (bitno) % SBITMAP_ELT_BITS);
}
/* The iterator for sbitmap. */
typedef struct {
/* The pointer to the first word of the bitmap. */
const SBITMAP_ELT_TYPE *ptr;
/* The size of the bitmap. */
unsigned int size;
/* The current word index. */
unsigned int word_num;
/* The current bit index (not modulo SBITMAP_ELT_BITS). */
unsigned int bit_num;
/* The words currently visited. */
SBITMAP_ELT_TYPE word;
} sbitmap_iterator;
/* Initialize the iterator I with sbitmap BMP and the initial index
MIN. */
static inline void
sbitmap_iter_init (sbitmap_iterator *i, const_sbitmap bmp, unsigned int min)
{
i->word_num = min / (unsigned int) SBITMAP_ELT_BITS;
i->bit_num = min;
i->size = bmp->size;
i->ptr = bmp->elms;
if (i->word_num >= i->size)
i->word = 0;
else
i->word = (i->ptr[i->word_num]
>> (i->bit_num % (unsigned int) SBITMAP_ELT_BITS));
}
/* Return true if we have more bits to visit, in which case *N is set
to the index of the bit to be visited. Otherwise, return
false. */
static inline bool
sbitmap_iter_cond (sbitmap_iterator *i, unsigned int *n)
{
/* Skip words that are zeros. */
for (; i->word == 0; i->word = i->ptr[i->word_num])
{
i->word_num++;
/* If we have reached the end, break. */
if (i->word_num >= i->size)
return false;
i->bit_num = i->word_num * SBITMAP_ELT_BITS;
}
/* Skip bits that are zero. */
for (; (i->word & 1) == 0; i->word >>= 1)
i->bit_num++;
*n = i->bit_num;
return true;
}
/* Advance to the next bit. */
static inline void
sbitmap_iter_next (sbitmap_iterator *i)
{
i->word >>= 1;
i->bit_num++;
}
/* Loop over all elements of SBITMAP, starting with MIN. In each
iteration, N is set to the index of the bit being visited. ITER is
an instance of sbitmap_iterator used to iterate the bitmap. */
#define EXECUTE_IF_SET_IN_SBITMAP(SBITMAP, MIN, N, ITER) \
for (sbitmap_iter_init (&(ITER), (SBITMAP), (MIN)); \
sbitmap_iter_cond (&(ITER), &(N)); \
sbitmap_iter_next (&(ITER)))
#define EXECUTE_IF_SET_IN_SBITMAP_REV(SBITMAP, N, CODE) \
do { \
unsigned int word_num_; \
unsigned int bit_num_; \
unsigned int size_ = (SBITMAP)->size; \
SBITMAP_ELT_TYPE *ptr_ = (SBITMAP)->elms; \
\
for (word_num_ = size_; word_num_ > 0; word_num_--) \
{ \
SBITMAP_ELT_TYPE word_ = ptr_[word_num_ - 1]; \
\
if (word_ != 0) \
for (bit_num_ = SBITMAP_ELT_BITS; bit_num_ > 0; bit_num_--) \
{ \
SBITMAP_ELT_TYPE _mask = (SBITMAP_ELT_TYPE)1 << (bit_num_ - 1);\
\
if ((word_ & _mask) != 0) \
{ \
word_ &= ~ _mask; \
(N) = (word_num_ - 1) * SBITMAP_ELT_BITS + bit_num_ - 1;\
CODE; \
if (word_ == 0) \
break; \
} \
} \
} \
} while (0)
#define sbitmap_free(MAP) (free((MAP)->popcount), free((MAP)))
#define sbitmap_vector_free(VEC) free(VEC)
struct int_list;
extern void dump_sbitmap (FILE *, const_sbitmap);
extern void dump_sbitmap_file (FILE *, const_sbitmap);
extern void dump_sbitmap_vector (FILE *, const char *, const char *, sbitmap *,
int);
extern sbitmap sbitmap_alloc (unsigned int);
extern sbitmap sbitmap_alloc_with_popcount (unsigned int);
extern sbitmap *sbitmap_vector_alloc (unsigned int, unsigned int);
extern sbitmap sbitmap_resize (sbitmap, unsigned int, int);
extern void sbitmap_copy (sbitmap, const_sbitmap);
extern void sbitmap_copy_n (sbitmap, const_sbitmap, unsigned int);
extern int sbitmap_equal (const_sbitmap, const_sbitmap);
extern bool sbitmap_empty_p (const_sbitmap);
extern void sbitmap_zero (sbitmap);
extern void sbitmap_ones (sbitmap);
extern void sbitmap_vector_zero (sbitmap *, unsigned int);
extern void sbitmap_vector_ones (sbitmap *, unsigned int);
extern void sbitmap_union_of_diff (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_union_of_diff_cg (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);
extern void sbitmap_difference (sbitmap, const_sbitmap, const_sbitmap);
extern void sbitmap_not (sbitmap, const_sbitmap);
extern void sbitmap_a_or_b_and_c (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_a_or_b_and_c_cg (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);
extern void sbitmap_a_and_b_or_c (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_a_and_b_or_c_cg (sbitmap, const_sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_any_common_bits (const_sbitmap, const_sbitmap);
extern void sbitmap_a_and_b (sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_a_and_b_cg (sbitmap, const_sbitmap, const_sbitmap);
extern void sbitmap_a_or_b (sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_a_or_b_cg (sbitmap, const_sbitmap, const_sbitmap);
extern void sbitmap_a_xor_b (sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_a_xor_b_cg (sbitmap, const_sbitmap, const_sbitmap);
extern bool sbitmap_a_subset_b_p (const_sbitmap, const_sbitmap);
extern int sbitmap_first_set_bit (const_sbitmap);
extern int sbitmap_last_set_bit (const_sbitmap);
extern void sbitmap_intersect_of_predsucc (sbitmap, sbitmap *, int,
struct int_list **);
#define sbitmap_intersect_of_predecessors sbitmap_intersect_of_predsucc
#define sbitmap_intersect_of_successors sbitmap_intersect_of_predsucc
extern void sbitmap_union_of_predsucc (sbitmap, sbitmap *, int,
struct int_list **);
#define sbitmap_union_of_predecessors sbitmap_union_of_predsucc
#define sbitmap_union_of_successors sbitmap_union_of_predsucc
/* Intersection and Union of preds/succs using the new flow graph
structure instead of the pred/succ arrays. */
extern void sbitmap_intersection_of_succs (sbitmap, sbitmap *, int);
extern void sbitmap_intersection_of_preds (sbitmap, sbitmap *, int);
extern void sbitmap_union_of_succs (sbitmap, sbitmap *, int);
extern void sbitmap_union_of_preds (sbitmap, sbitmap *, int);
extern void debug_sbitmap (const_sbitmap);
extern sbitmap sbitmap_realloc (sbitmap, unsigned int);
extern unsigned long sbitmap_popcount(const_sbitmap, unsigned long);
extern void sbitmap_verify_popcount (const_sbitmap);
#endif /* ! GCC_SBITMAP_H */
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