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|
/*
+----------------------------------------------------------------------+
| Zend OPcache JIT |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2018 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> |
+----------------------------------------------------------------------+
*/
#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
#define ZEND_BITSET_ALLOCA(n, use_heap) \
(zend_bitset)do_alloca((n) * ZEND_BITSET_ELM_SIZE, use_heap)
/* Number of trailing zero bits (0x01 -> 0; 0x40 -> 6; 0x00 -> LEN) */
static zend_always_inline int zend_ulong_ntz(zend_ulong num)
{
#if (defined(__GNUC__) || __has_builtin(__builtin_ctzl)) \
&& SIZEOF_ZEND_LONG == SIZEOF_LONG && defined(PHP_HAVE_BUILTIN_CTZL)
return __builtin_ctzl(num);
#elif (defined(__GNUC__) || __has_builtin(__builtin_ctzll)) && defined(PHP_HAVE_BUILTIN_CTZLL)
return __builtin_ctzll(num);
#elif defined(_WIN32)
unsigned long index;
#if defined(_WIN64)
if (!BitScanForward64(&index, num)) {
#else
if (!BitScanForward(&index, num)) {
#endif
/* undefined behavior */
return SIZEOF_ZEND_LONG * 8;
}
return (int) index;
#else
int n;
if (num == Z_UL(0)) return SIZEOF_ZEND_LONG * 8;
n = 1;
#if SIZEOF_ZEND_LONG == 8
if ((num & 0xffffffff) == 0) {n += 32; num = num >> Z_UL(32);}
#endif
if ((num & 0x0000ffff) == 0) {n += 16; num = num >> 16;}
if ((num & 0x000000ff) == 0) {n += 8; num = num >> 8;}
if ((num & 0x0000000f) == 0) {n += 4; num = num >> 4;}
if ((num & 0x00000003) == 0) {n += 2; num = num >> 2;}
return n - (num & 1);
#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);
}
static inline zend_bool zend_bitset_in(zend_bitset set, uint32_t n)
{
return ZEND_BIT_TEST(set, n);
}
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 zend_bool zend_bitset_subset(zend_bitset set1, zend_bitset set2, uint32_t len)
{
uint32_t i;
for (i = 0; i < len; i++) {
if (set1[i] & ~set2[i]) {
return 0;
}
}
return 1;
}
static inline int zend_bitset_first(zend_bitset set, uint32_t len)
{
uint32_t i;
for (i = 0; i < len; i++) {
if (set[i]) {
return ZEND_BITSET_ELM_SIZE * 8 * i + zend_ulong_ntz(set[i]);
}
}
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 */
}
#define ZEND_BITSET_FOREACH(set, len, bit) do { \
zend_bitset _set = (set); \
uint32_t _i, _len = (len); \
for (_i = 0; _i < _len; _i++) { \
zend_ulong _x = _set[_i]; \
if (_x) { \
(bit) = ZEND_BITSET_ELM_SIZE * 8 * _i; \
for (; _x != 0; _x >>= Z_UL(1), (bit)++) { \
if (!(_x & Z_UL(1))) continue;
#define ZEND_BITSET_REVERSE_FOREACH(set, len, bit) do { \
zend_bitset _set = (set); \
uint32_t _i = (len); \
zend_ulong _test = Z_UL(1) << (ZEND_BITSET_ELM_SIZE * 8 - 1); \
while (_i-- > 0) { \
zend_ulong _x = _set[_i]; \
if (_x) { \
(bit) = ZEND_BITSET_ELM_SIZE * 8 * (_i + 1) - 1; \
for (; _x != 0; _x <<= Z_UL(1), (bit)--) { \
if (!(_x & _test)) continue; \
#define ZEND_BITSET_FOREACH_END() \
} \
} \
} \
} while (0)
static inline int zend_bitset_pop_first(zend_bitset set, uint32_t len) {
int i = zend_bitset_first(set, len);
if (i >= 0) {
zend_bitset_excl(set, i);
}
return i;
}
#endif /* _ZEND_BITSET_H_ */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
