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khash.h
635 lines (561 loc) · 30.4 KB
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khash.h
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/* The MIT License
Copyright (c) 2008, 2009, 2011 by Attractive Chaos <attractor@live.co.uk>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
/*
An example:
#include "khash.h"
KHASH_MAP_INIT_INT(32, char)
int main() {
int ret, is_missing;
khiter_t k;
khash_t(32) *h = kh_init(32);
k = kh_put(32, h, 5, &ret);
if (!ret) kh_del(32, h, k);
kh_value(h, k) = 10;
k = kh_get(32, h, 10);
is_missing = (k == kh_end(h));
k = kh_get(32, h, 5);
kh_del(32, h, k);
for (k = kh_begin(h); k != kh_end(h); ++k)
if (kh_exist(h, k)) kh_value(h, k) = 1;
kh_destroy(32, h);
return 0;
}
*/
/*
2011-09-16 (0.2.6):
* The capacity is a power of 2. This seems to dramatically improve the
speed for simple keys. Thank Zilong Tan for the suggestion. Reference:
- http://code.google.com/p/ulib/
- http://nothings.org/computer/judy/
* Allow to optionally use linear probing which usually has better
performance for random input. Double hashing is still the default as it
is more robust to certain non-random input.
* Added Wang's integer hash function (not used by default). This hash
function is more robust to certain non-random input.
2011-02-14 (0.2.5):
* Allow to declare global functions.
2009-09-26 (0.2.4):
* Improve portability
2008-09-19 (0.2.3):
* Corrected the example
* Improved interfaces
2008-09-11 (0.2.2):
* Improved speed a little in kh_put()
2008-09-10 (0.2.1):
* Added kh_clear()
* Fixed a compiling error
2008-09-02 (0.2.0):
* Changed to token concatenation which increases flexibility.
2008-08-31 (0.1.2):
* Fixed a bug in kh_get(), which has not been tested previously.
2008-08-31 (0.1.1):
* Added destructor
*/
#ifndef __AC_KHASH_H
#define __AC_KHASH_H
/*!
@header
Generic hash table library.
*/
#define AC_VERSION_KHASH_H "0.2.6"
#include <limits.h>
#include <stdlib.h>
#include <string.h>
/* compipler specific configuration */
#if UINT_MAX == 0xffffffffu
typedef unsigned int khint32_t;
#elif ULONG_MAX == 0xffffffffu
typedef unsigned long khint32_t;
#endif
#if ULONG_MAX == ULLONG_MAX
typedef unsigned long khint64_t;
#else
typedef unsigned long long khint64_t;
#endif
#ifdef _MSC_VER
#define inline __inline
#endif
typedef khint32_t khint_t;
typedef khint_t khiter_t;
#define __ac_isempty(flag, i) ((flag[i >> 4] >> ((i & 0xfU) << 1)) & 2)
#define __ac_isdel(flag, i) ((flag[i >> 4] >> ((i & 0xfU) << 1)) & 1)
#define __ac_iseither(flag, i) ((flag[i >> 4] >> ((i & 0xfU) << 1)) & 3)
#define __ac_set_isdel_false(flag, i) \
(flag[i >> 4] &= ~(1ul << ((i & 0xfU) << 1)))
#define __ac_set_isempty_false(flag, i) \
(flag[i >> 4] &= ~(2ul << ((i & 0xfU) << 1)))
#define __ac_set_isboth_false(flag, i) \
(flag[i >> 4] &= ~(3ul << ((i & 0xfU) << 1)))
#define __ac_set_isdel_true(flag, i) (flag[i >> 4] |= 1ul << ((i & 0xfU) << 1))
#ifdef KHASH_LINEAR
#define __ac_inc(k, m) 1
#else
#define __ac_inc(k, m) (((k) >> 3 ^ (k) << 3) | 1) & (m)
#endif
#define __ac_fsize(m) ((m) < 16 ? 1 : (m) >> 4)
#ifndef kroundup32
#define kroundup32(x) \
(--(x), (x) |= (x) >> 1, (x) |= (x) >> 2, (x) |= (x) >> 4, \
(x) |= (x) >> 8, (x) |= (x) >> 16, ++(x))
#endif
static const double __ac_HASH_UPPER = 0.77;
#define KHASH_DECLARE(name, khkey_t, khval_t) \
typedef struct \
{ \
khint_t n_buckets, size, n_occupied, upper_bound; \
khint32_t *flags; \
khkey_t *keys; \
khval_t *vals; \
} kh_##name##_t; \
extern kh_##name##_t *kh_init_##name(); \
extern void kh_destroy_##name(kh_##name##_t *h); \
extern void kh_clear_##name(kh_##name##_t *h); \
extern khint_t kh_get_##name(const kh_##name##_t *h, khkey_t key); \
extern void kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets); \
extern khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret); \
extern void kh_del_##name(kh_##name##_t *h, khint_t x);
#define KHASH_INIT2(name, SCOPE, khkey_t, khval_t, kh_is_map, __hash_func, \
__hash_equal) \
typedef struct \
{ \
khint_t n_buckets, size, n_occupied, upper_bound; \
khint32_t *flags; \
khkey_t *keys; \
khval_t *vals; \
} kh_##name##_t; \
SCOPE kh_##name##_t *kh_init_##name() \
{ \
return (kh_##name##_t *)calloc(1, sizeof(kh_##name##_t)); \
} \
SCOPE void kh_destroy_##name(kh_##name##_t *h) \
{ \
if (h) \
{ \
free(h->keys); \
free(h->flags); \
free(h->vals); \
free(h); \
} \
} \
SCOPE void kh_clear_##name(kh_##name##_t *h) \
{ \
if (h && h->flags) \
{ \
memset(h->flags, 0xaa, \
__ac_fsize(h->n_buckets) * sizeof(khint32_t)); \
h->size = h->n_occupied = 0; \
} \
} \
SCOPE khint_t kh_get_##name(const kh_##name##_t *h, khkey_t key) \
{ \
if (h->n_buckets) \
{ \
khint_t inc, k, i, last, mask; \
mask = h->n_buckets - 1; \
k = __hash_func(key); \
i = k & mask; \
inc = __ac_inc(k, mask); \
last = i; /* inc==1 for linear probing */ \
while ( \
!__ac_isempty(h->flags, i) && \
(__ac_isdel(h->flags, i) || !__hash_equal(h->keys[i], key))) \
{ \
i = (i + inc) & mask; \
if (i == last) return h->n_buckets; \
} \
return __ac_iseither(h->flags, i) ? h->n_buckets : i; \
} \
else \
return 0; \
} \
SCOPE void kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets) \
{ /* This function uses 0.25*n_bucktes bytes of working space instead of \
[sizeof(key_t+val_t)+.25]*n_buckets. */ \
khint32_t *new_flags = 0; \
khint_t j = 1; \
{ \
kroundup32(new_n_buckets); \
if (new_n_buckets < 4) new_n_buckets = 4; \
if (h->size >= (khint_t)(new_n_buckets * __ac_HASH_UPPER + 0.5)) \
j = 0; /* requested size is too small */ \
else \
{ /* hash table size to be changed (shrink or expand); rehash */ \
new_flags = (khint32_t *)malloc(__ac_fsize(new_n_buckets) * \
sizeof(khint32_t)); \
memset(new_flags, 0xaa, \
__ac_fsize(new_n_buckets) * sizeof(khint32_t)); \
if (h->n_buckets < new_n_buckets) \
{ /* expand */ \
h->keys = (khkey_t *)realloc( \
h->keys, new_n_buckets * sizeof(khkey_t)); \
if (kh_is_map) \
h->vals = (khval_t *)realloc( \
h->vals, new_n_buckets * sizeof(khval_t)); \
} /* otherwise shrink */ \
} \
} \
if (j) \
{ /* rehashing is needed */ \
for (j = 0; j != h->n_buckets; ++j) \
{ \
if (__ac_iseither(h->flags, j) == 0) \
{ \
khkey_t key = h->keys[j]; \
khval_t val; \
khint_t new_mask; \
new_mask = new_n_buckets - 1; \
if (kh_is_map) val = h->vals[j]; \
__ac_set_isdel_true(h->flags, j); \
while (1) \
{ /* kick-out process; sort of like in Cuckoo hashing */ \
khint_t inc, k, i; \
k = __hash_func(key); \
i = k & new_mask; \
inc = __ac_inc(k, new_mask); \
while (!__ac_isempty(new_flags, i)) \
i = (i + inc) & new_mask; \
__ac_set_isempty_false(new_flags, i); \
if (i < h->n_buckets && \
__ac_iseither(h->flags, i) == 0) \
{ /* kick out the existing element */ \
{ \
khkey_t tmp = h->keys[i]; \
h->keys[i] = key; \
key = tmp; \
} \
if (kh_is_map) \
{ \
khval_t tmp = h->vals[i]; \
h->vals[i] = val; \
val = tmp; \
} \
__ac_set_isdel_true(h->flags, \
i); /* mark it as deleted in \
the old hash table */ \
} \
else \
{ /* write the element and jump out of the loop */ \
h->keys[i] = key; \
if (kh_is_map) h->vals[i] = val; \
break; \
} \
} \
} \
} \
if (h->n_buckets > new_n_buckets) \
{ /* shrink the hash table */ \
h->keys = (khkey_t *)realloc(h->keys, \
new_n_buckets * sizeof(khkey_t)); \
if (kh_is_map) \
h->vals = (khval_t *)realloc( \
h->vals, new_n_buckets * sizeof(khval_t)); \
} \
free(h->flags); /* free the working space */ \
h->flags = new_flags; \
h->n_buckets = new_n_buckets; \
h->n_occupied = h->size; \
h->upper_bound = (khint_t)(h->n_buckets * __ac_HASH_UPPER + 0.5); \
} \
} \
SCOPE khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret) \
{ \
khint_t x; \
if (h->n_occupied >= h->upper_bound) \
{ /* update the hash table */ \
if (h->n_buckets > (h->size << 1)) \
kh_resize_##name(h, h->n_buckets - \
1); /* clear "deleted" elements */ \
else \
kh_resize_##name(h, h->n_buckets + \
1); /* expand the hash table */ \
} /* TODO: to implement automatically shrinking; resize() already \
support shrinking */ \
{ \
khint_t inc, k, i, site, last, mask = h->n_buckets - 1; \
x = site = h->n_buckets; \
k = __hash_func(key); \
i = k & mask; \
if (__ac_isempty(h->flags, i)) \
x = i; /* for speed up */ \
else \
{ \
inc = __ac_inc(k, mask); \
last = i; \
while (!__ac_isempty(h->flags, i) && \
(__ac_isdel(h->flags, i) || \
!__hash_equal(h->keys[i], key))) \
{ \
if (__ac_isdel(h->flags, i)) site = i; \
i = (i + inc) & mask; \
if (i == last) \
{ \
x = site; \
break; \
} \
} \
if (x == h->n_buckets) \
{ \
if (__ac_isempty(h->flags, i) && site != h->n_buckets) \
x = site; \
else \
x = i; \
} \
} \
} \
if (__ac_isempty(h->flags, x)) \
{ /* not present at all */ \
h->keys[x] = key; \
__ac_set_isboth_false(h->flags, x); \
++h->size; \
++h->n_occupied; \
*ret = 1; \
} \
else if (__ac_isdel(h->flags, x)) \
{ /* deleted */ \
h->keys[x] = key; \
__ac_set_isboth_false(h->flags, x); \
++h->size; \
*ret = 2; \
} \
else \
*ret = 0; /* Don't touch h->keys[x] if present and not deleted */ \
return x; \
} \
SCOPE void kh_del_##name(kh_##name##_t *h, khint_t x) \
{ \
if (x != h->n_buckets && !__ac_iseither(h->flags, x)) \
{ \
__ac_set_isdel_true(h->flags, x); \
--h->size; \
} \
}
#define KHASH_INIT(name, khkey_t, khval_t, kh_is_map, __hash_func, \
__hash_equal) \
KHASH_INIT2(name, static inline, khkey_t, khval_t, kh_is_map, __hash_func, \
__hash_equal)
/* --- BEGIN OF HASH FUNCTIONS --- */
/*! @function
@abstract Integer hash function
@param key The integer [khint32_t]
@return The hash value [khint_t]
*/
#define kh_int_hash_func(key) (khint32_t)(key)
/*! @function
@abstract Integer comparison function
*/
#define kh_int_hash_equal(a, b) ((a) == (b))
/*! @function
@abstract 64-bit integer hash function
@param key The integer [khint64_t]
@return The hash value [khint_t]
*/
#define kh_int64_hash_func(key) (khint32_t)((key) >> 33 ^ (key) ^ (key) << 11)
/*! @function
@abstract 64-bit integer comparison function
*/
#define kh_int64_hash_equal(a, b) ((a) == (b))
/*! @function
@abstract const char* hash function
@param s Pointer to a null terminated string
@return The hash value
*/
static inline khint_t __ac_X31_hash_string(const char *s)
{
khint_t h = *s;
if (h)
for (++s; *s; ++s)
h = (h << 5) - h + *s;
return h;
}
/*! @function
@abstract Another interface to const char* hash function
@param key Pointer to a null terminated string [const char*]
@return The hash value [khint_t]
*/
#define kh_str_hash_func(key) __ac_X31_hash_string(key)
/*! @function
@abstract Const char* comparison function
*/
#define kh_str_hash_equal(a, b) (strcmp(a, b) == 0)
static inline khint_t __ac_Wang_hash(khint_t key)
{
key += ~(key << 15);
key ^= (key >> 10);
key += (key << 3);
key ^= (key >> 6);
key += ~(key << 11);
key ^= (key >> 16);
return key;
}
#define kh_int_hash_func2(k) __ac_Wang_hash((khint_t)key)
/* --- END OF HASH FUNCTIONS --- */
/* Other convenient macros... */
/*!
@abstract Type of the hash table.
@param name Name of the hash table [symbol]
*/
#define khash_t(name) kh_##name##_t
/*! @function
@abstract Initiate a hash table.
@param name Name of the hash table [symbol]
@return Pointer to the hash table [khash_t(name)*]
*/
#define kh_init(name) kh_init_##name()
/*! @function
@abstract Destroy a hash table.
@param name Name of the hash table [symbol]
@param h Pointer to the hash table [khash_t(name)*]
*/
#define kh_destroy(name, h) kh_destroy_##name(h)
/*! @function
@abstract Reset a hash table without deallocating memory.
@param name Name of the hash table [symbol]
@param h Pointer to the hash table [khash_t(name)*]
*/
#define kh_clear(name, h) kh_clear_##name(h)
/*! @function
@abstract Resize a hash table.
@param name Name of the hash table [symbol]
@param h Pointer to the hash table [khash_t(name)*]
@param s New size [khint_t]
*/
#define kh_resize(name, h, s) kh_resize_##name(h, s)
/*! @function
@abstract Insert a key to the hash table.
@param name Name of the hash table [symbol]
@param h Pointer to the hash table [khash_t(name)*]
@param k Key [type of keys]
@param r Extra return code: 0 if the key is present in the hash table;
1 if the bucket is empty (never used); 2 if the element in
the bucket has been deleted [int*]
@return Iterator to the inserted element [khint_t]
*/
#define kh_put(name, h, k, r) kh_put_##name(h, k, r)
/*! @function
@abstract Retrieve a key from the hash table.
@param name Name of the hash table [symbol]
@param h Pointer to the hash table [khash_t(name)*]
@param k Key [type of keys]
@return Iterator to the found element, or kh_end(h) is the element is
absent [khint_t]
*/
#define kh_get(name, h, k) kh_get_##name(h, k)
/*! @function
@abstract Remove a key from the hash table.
@param name Name of the hash table [symbol]
@param h Pointer to the hash table [khash_t(name)*]
@param k Iterator to the element to be deleted [khint_t]
*/
#define kh_del(name, h, k) kh_del_##name(h, k)
/*! @function
@abstract Test whether a bucket contains data.
@param h Pointer to the hash table [khash_t(name)*]
@param x Iterator to the bucket [khint_t]
@return 1 if containing data; 0 otherwise [int]
*/
#define kh_exist(h, x) (!__ac_iseither((h)->flags, (x)))
/*! @function
@abstract Get key given an iterator
@param h Pointer to the hash table [khash_t(name)*]
@param x Iterator to the bucket [khint_t]
@return Key [type of keys]
*/
#define kh_key(h, x) ((h)->keys[x])
/*! @function
@abstract Get value given an iterator
@param h Pointer to the hash table [khash_t(name)*]
@param x Iterator to the bucket [khint_t]
@return Value [type of values]
@discussion For hash sets, calling this results in segfault.
*/
#define kh_val(h, x) ((h)->vals[x])
/*! @function
@abstract Alias of kh_val()
*/
#define kh_value(h, x) ((h)->vals[x])
/*! @function
@abstract Get the start iterator
@param h Pointer to the hash table [khash_t(name)*]
@return The start iterator [khint_t]
*/
#define kh_begin(h) (khint_t)(0)
/*! @function
@abstract Get the end iterator
@param h Pointer to the hash table [khash_t(name)*]
@return The end iterator [khint_t]
*/
#define kh_end(h) ((h)->n_buckets)
/*! @function
@abstract Get the number of elements in the hash table
@param h Pointer to the hash table [khash_t(name)*]
@return Number of elements in the hash table [khint_t]
*/
#define kh_size(h) ((h)->size)
/*! @function
@abstract Get the number of buckets in the hash table
@param h Pointer to the hash table [khash_t(name)*]
@return Number of buckets in the hash table [khint_t]
*/
#define kh_n_buckets(h) ((h)->n_buckets)
/* More conenient interfaces */
/*! @function
@abstract Instantiate a hash set containing integer keys
@param name Name of the hash table [symbol]
*/
#define KHASH_SET_INIT_INT(name) \
KHASH_INIT(name, khint32_t, char, 0, kh_int_hash_func, kh_int_hash_equal)
/*! @function
@abstract Instantiate a hash map containing integer keys
@param name Name of the hash table [symbol]
@param khval_t Type of values [type]
*/
#define KHASH_MAP_INIT_INT(name, khval_t) \
KHASH_INIT(name, khint32_t, khval_t, 1, kh_int_hash_func, kh_int_hash_equal)
/*! @function
@abstract Instantiate a hash map containing 64-bit integer keys
@param name Name of the hash table [symbol]
*/
#define KHASH_SET_INIT_INT64(name) \
KHASH_INIT(name, khint64_t, char, 0, kh_int64_hash_func, \
kh_int64_hash_equal)
/*! @function
@abstract Instantiate a hash map containing 64-bit integer keys
@param name Name of the hash table [symbol]
@param khval_t Type of values [type]
*/
#define KHASH_MAP_INIT_INT64(name, khval_t) \
KHASH_INIT(name, khint64_t, khval_t, 1, kh_int64_hash_func, \
kh_int64_hash_equal)
typedef const char *kh_cstr_t;
/*! @function
@abstract Instantiate a hash map containing const char* keys
@param name Name of the hash table [symbol]
*/
#define KHASH_SET_INIT_STR(name) \
KHASH_INIT(name, kh_cstr_t, char, 0, kh_str_hash_func, kh_str_hash_equal)
/*! @function
@abstract Instantiate a hash map containing const char* keys
@param name Name of the hash table [symbol]
@param khval_t Type of values [type]
*/
#define KHASH_MAP_INIT_STR(name, khval_t) \
KHASH_INIT(name, kh_cstr_t, khval_t, 1, kh_str_hash_func, kh_str_hash_equal)
#endif /* __AC_KHASH_H */