php-src/Zend/zend_bitset.h

/*
   +----------------------------------------------------------------------+
   | Zend OPcache JIT                                                     |
   +----------------------------------------------------------------------+
   | Copyright (c) 1998-2014 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Dmitry Stogov <dmitry@zend.com>                             |
   +----------------------------------------------------------------------+
*/

/* $Id:$ */

#ifndef _ZEND_BITSET_H_
#define _ZEND_BITSET_H_

typedef zend_ulong *zend_bitset;

#define ZEND_BITSET_ELM_SIZE sizeof(zend_ulong)

#if SIZEOF_ZEND_LONG == 4
# define ZEND_BITSET_ELM_NUM(n)		((n) >> 5)
# define ZEND_BITSET_BIT_NUM(n)		((zend_ulong)(n) & Z_UL(0x1f))
#elif SIZEOF_ZEND_LONG == 8
# define ZEND_BITSET_ELM_NUM(n)		((n) >> 6)
# define ZEND_BITSET_BIT_NUM(n)		((zend_ulong)(n) & Z_UL(0x3f))
#else
# define ZEND_BITSET_ELM_NUM(n)		((n) / (sizeof(zend_long) * 8))
# define ZEND_BITSET_BIT_NUM(n)		((n) % (sizeof(zend_long) * 8))
#endif

/* Returns the number of zend_ulong words needed to store a bitset that is N
   bits long.  */
static inline uint32_t zend_bitset_len(uint32_t n)
{
	return (n + ((sizeof(zend_long) * 8) - 1)) / (sizeof(zend_long) * 8);
}

#define ZEND_BITSET_ALLOCA(n, use_heap) \
	(zend_bitset)do_alloca((n) * ZEND_BITSET_ELM_SIZE, use_heap)

static inline zend_bool zend_bitset_in(zend_bitset set, uint32_t n)
{
	return (set[ZEND_BITSET_ELM_NUM(n)] & (Z_UL(1) << ZEND_BITSET_BIT_NUM(n))) != Z_UL(0);
}

static inline void zend_bitset_incl(zend_bitset set, uint32_t n)
{
	set[ZEND_BITSET_ELM_NUM(n)] |= Z_UL(1) << ZEND_BITSET_BIT_NUM(n);
}

static inline void zend_bitset_excl(zend_bitset set, uint32_t n)
{
	set[ZEND_BITSET_ELM_NUM(n)] &= ~(Z_UL(1) << ZEND_BITSET_BIT_NUM(n));
}

static inline void zend_bitset_clear(zend_bitset set, uint32_t len)
{
	memset(set, 0, len * ZEND_BITSET_ELM_SIZE);
}

static inline int zend_bitset_empty(zend_bitset set, uint32_t len)
{
	uint32_t i;
	for (i = 0; i < len; i++) {
		if (set[i]) {
			return 0;
		}
	}
	return 1;
}

static inline void zend_bitset_fill(zend_bitset set, uint32_t len)
{
	memset(set, 0xff, len * ZEND_BITSET_ELM_SIZE);
}

static inline zend_bool zend_bitset_equal(zend_bitset set1, zend_bitset set2, uint32_t len)
{
    return memcmp(set1, set2, len * ZEND_BITSET_ELM_SIZE) == 0;
}

static inline void zend_bitset_copy(zend_bitset set1, zend_bitset set2, uint32_t len)
{
    memcpy(set1, set2, len * ZEND_BITSET_ELM_SIZE);
}

static inline void zend_bitset_intersection(zend_bitset set1, zend_bitset set2, uint32_t len)
{
    uint32_t i;

    for (i = 0; i < len; i++) {
		set1[i] &= set2[i];
	}
}

static inline void zend_bitset_union(zend_bitset set1, zend_bitset set2, uint32_t len)
{
	uint32_t i;

	for (i = 0; i < len; i++) {
		set1[i] |= set2[i];
	}
}

static inline void zend_bitset_difference(zend_bitset set1, zend_bitset set2, uint32_t len)
{
	uint32_t i;

	for (i = 0; i < len; i++) {
		set1[i] = set1[i] & ~set2[i];
	}
}

static inline void zend_bitset_union_with_intersection(zend_bitset set1, zend_bitset set2, zend_bitset set3, zend_bitset set4, uint32_t len)
{
	uint32_t i;

	for (i = 0; i < len; i++) {
		set1[i] = set2[i] | (set3[i] & set4[i]);
	}
}

static inline void zend_bitset_union_with_difference(zend_bitset set1, zend_bitset set2, zend_bitset set3, zend_bitset set4, uint32_t len)
{
	uint32_t i;

	for (i = 0; i < len; i++) {
		set1[i] = set2[i] | (set3[i] & ~set4[i]);
	}
}

static inline int zend_bitset_first(zend_bitset set, uint32_t len)
{
	uint32_t i;

	for (i = 0; i < len; i++) {
		if (set[i]) {
			int j = ZEND_BITSET_ELM_SIZE * 8 * i;
			zend_ulong x = set[i];
			while ((x & Z_UL(1)) == 0) {
				x = x >> Z_UL(1);
				j++;
			}
			return j;
		}
	}
	return -1; /* empty set */
}

static inline int zend_bitset_last(zend_bitset set, uint32_t len)
{
	uint32_t i = len;

	while (i > 0) {
		i--;
		if (set[i]) {
			int j = ZEND_BITSET_ELM_SIZE * 8 * i - 1;
			zend_ulong x = set[i];
			while (x != Z_UL(0)) {
				x = x >> Z_UL(1);
				j++;
			}
			return j;
		}
	}
	return -1; /* empty set */
}

#endif /* _ZEND_BITSET_H_ */

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * indent-tabs-mode: t
 * End:
 */