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/* Sparse array based bitmaps.
Copyright (C) 2007, 2008 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_EBITMAP_H
#define GCC_EBITMAP_H
#include "sbitmap.h"
#define EBITMAP_ELT_BITS ((unsigned) HOST_BITS_PER_WIDEST_FAST_INT)
#define EBITMAP_ELT_TYPE unsigned HOST_WIDEST_FAST_INT
typedef struct ebitmap_def
{
unsigned int n_elts; /* number of elements in the array. */
sbitmap wordmask; /* wordmask saying which words are
nonzero. */
unsigned int numwords; /* number of nonzero words. */
unsigned int cacheindex; /* which word cache is. */
EBITMAP_ELT_TYPE *elts; /* nonzero element array. */
EBITMAP_ELT_TYPE *cache; /* last tested element, or NULL. */
} *ebitmap;
#define ebitmap_empty_p(MAP) ((MAP)->numwords == 0)
#define ebitmap_free(MAP) (free((MAP)->elts), \
sbitmap_free ((MAP)->wordmask), \
free((MAP)))
extern void ebitmap_set_bit (ebitmap, unsigned int);
extern void ebitmap_clear_bit (ebitmap, unsigned int);
extern bool ebitmap_bit_p (ebitmap, unsigned int);
extern void dump_ebitmap (FILE *, ebitmap);
extern void dump_ebitmap_file (FILE *, ebitmap);
extern void dump_ebitmap_vector (FILE *, const char *, const char *, ebitmap *,
int);
extern ebitmap ebitmap_alloc (unsigned int);
extern ebitmap *ebitmap_vector_alloc (unsigned int, unsigned int);
extern void ebitmap_copy (ebitmap, ebitmap);
extern void ebitmap_and (ebitmap, ebitmap, ebitmap);
extern void ebitmap_and_into (ebitmap, ebitmap);
extern bool ebitmap_and_compl (ebitmap, ebitmap, ebitmap);
extern bool ebitmap_and_compl_into (ebitmap, ebitmap);
extern bool ebitmap_ior_into (ebitmap, ebitmap);
extern bool ebitmap_ior (ebitmap, ebitmap, ebitmap);
extern bool ebitmap_ior_and_compl (ebitmap, ebitmap, ebitmap, ebitmap);
extern bool ebitmap_ior_and_compl_into (ebitmap, ebitmap, ebitmap);
extern bool ebitmap_equal_p (ebitmap, ebitmap);
extern void ebitmap_clear (ebitmap);
extern int ebitmap_last_set_bit (ebitmap);
extern void debug_ebitmap (ebitmap);
extern void dump_ebitmap (FILE *, ebitmap);
extern unsigned long ebitmap_popcount(ebitmap, unsigned long);
/* The iterator for ebitmap. */
typedef struct {
/* The pointer to the first word of the bitmap. */
EBITMAP_ELT_TYPE *ptr;
/* Element number inside ptr that we are at. */
unsigned int eltnum;
/* The size of the bitmap. */
unsigned int size;
/* Current bit index. */
unsigned int bit_num;
/* The words currently visited. */
EBITMAP_ELT_TYPE word;
/* The word mask iterator. */
sbitmap_iterator maskiter;
} ebitmap_iterator;
static inline void
ebitmap_iter_init (ebitmap_iterator *i, ebitmap bmp, unsigned int min)
{
sbitmap_iter_init (&i->maskiter, bmp->wordmask,
min / EBITMAP_ELT_BITS);
i->size = bmp->numwords;
if (i->size == 0)
{
i->ptr = NULL;
i->eltnum = 0;
i->bit_num = 0;
i->word = 0;
return;
}
i->ptr = bmp->elts;
i->bit_num = min;
i->eltnum = 0;
if ((min / EBITMAP_ELT_BITS) >= bmp->wordmask->n_bits)
{
i->word = 0;
}
else
{
if (TEST_BIT (bmp->wordmask, min / EBITMAP_ELT_BITS) == 0)
i->word = 0;
else
{
unsigned int wordindex = min / EBITMAP_ELT_BITS;
unsigned int count = sbitmap_popcount (bmp->wordmask, wordindex);
i->word = i->ptr[count] >> (i->bit_num % (unsigned int)EBITMAP_ELT_BITS);
i->eltnum = count + 1;
}
}
}
static inline bool
ebitmap_iter_cond (ebitmap_iterator *i, unsigned int *n)
{
unsigned int ourn = 0;
if (i->size == 0)
return false;
if (i->word == 0)
{
sbitmap_iter_next (&i->maskiter);
if (!sbitmap_iter_cond (&i->maskiter, &ourn))
return false;
i->bit_num = ourn * EBITMAP_ELT_BITS;
i->word = i->ptr[i->eltnum++];
}
/* Skip bits that are zero. */
for (; (i->word & 1) == 0; i->word >>= 1)
i->bit_num++;
*n = i->bit_num;
return true;
}
static inline void
ebitmap_iter_next (ebitmap_iterator *i)
{
i->word >>= 1;
i->bit_num++;
}
/* Loop over all elements of EBITMAP, starting with MIN. In each
iteration, N is set to the index of the bit being visited. ITER is
an instance of ebitmap_iterator used to iterate the bitmap. */
#define EXECUTE_IF_SET_IN_EBITMAP(EBITMAP, MIN, N, ITER) \
for (ebitmap_iter_init (&(ITER), (EBITMAP), (MIN)); \
ebitmap_iter_cond (&(ITER), &(N)); \
ebitmap_iter_next (&(ITER)))
#endif /* ! GCC_EBITMAP_H */
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