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Diffstat (limited to 'ext/raindrops/khashl.h')
| -rw-r--r-- | ext/raindrops/khashl.h | 444 |
1 files changed, 444 insertions, 0 deletions
diff --git a/ext/raindrops/khashl.h b/ext/raindrops/khashl.h new file mode 100644 index 0000000..9a6e4fe --- /dev/null +++ b/ext/raindrops/khashl.h @@ -0,0 +1,444 @@ +/* The MIT License + + Copyright (c) 2019-2023 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. +*/ + +#ifndef __AC_KHASHL_H +#define __AC_KHASHL_H + +#define AC_VERSION_KHASHL_H "0.2" + +#include <stdlib.h> +#include <string.h> +#include <limits.h> + +/************************************ + * Compiler specific configurations * + ************************************/ + +#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 + +#ifndef kh_inline +#ifdef _MSC_VER +#define kh_inline __inline +#else +#define kh_inline inline +#endif +#endif /* kh_inline */ + +#ifndef klib_unused +#if (defined __clang__ && __clang_major__ >= 3) || (defined __GNUC__ && __GNUC__ >= 3) +#define klib_unused __attribute__ ((__unused__)) +#else +#define klib_unused +#endif +#endif /* klib_unused */ + +#define KH_LOCAL static kh_inline klib_unused + +typedef khint32_t khint_t; + +/****************** + * malloc aliases * + ******************/ + +#ifndef kcalloc +#define kcalloc(N,Z) calloc(N,Z) +#endif +#ifndef kmalloc +#define kmalloc(Z) malloc(Z) +#endif +#ifndef krealloc +#define krealloc(P,Z) realloc(P,Z) +#endif +#ifndef kfree +#define kfree(P) free(P) +#endif + +/**************************** + * Simple private functions * + ****************************/ + +#define __kh_used(flag, i) (flag[i>>5] >> (i&0x1fU) & 1U) +#define __kh_set_used(flag, i) (flag[i>>5] |= 1U<<(i&0x1fU)) +#define __kh_set_unused(flag, i) (flag[i>>5] &= ~(1U<<(i&0x1fU))) + +#define __kh_fsize(m) ((m) < 32? 1 : (m)>>5) + +static kh_inline khint_t __kh_h2b(khint_t hash, khint_t bits) { return hash * 2654435769U >> (32 - bits); } + +/******************* + * Hash table base * + *******************/ + +#define __KHASHL_TYPE(HType, khkey_t) \ + typedef struct HType { \ + khint_t bits, count; \ + khint32_t *used; \ + khkey_t *keys; \ + } HType; + +#define __KHASHL_PROTOTYPES(HType, prefix, khkey_t) \ + extern HType *prefix##_init(void); \ + extern void prefix##_destroy(HType *h); \ + extern void prefix##_clear(HType *h); \ + extern khint_t prefix##_getp(const HType *h, const khkey_t *key); \ + extern int prefix##_resize(HType *h, khint_t new_n_buckets); \ + extern khint_t prefix##_putp(HType *h, const khkey_t *key, int *absent); \ + extern void prefix##_del(HType *h, khint_t k); + +#define __KHASHL_IMPL_BASIC(SCOPE, HType, prefix) \ + SCOPE HType *prefix##_init(void) { \ + return (HType*)kcalloc(1, sizeof(HType)); \ + } \ + SCOPE void prefix##_destroy(HType *h) { \ + if (!h) return; \ + kfree((void *)h->keys); kfree(h->used); \ + kfree(h); \ + } \ + SCOPE void prefix##_clear(HType *h) { \ + if (h && h->used) { \ + khint_t n_buckets = (khint_t)1U << h->bits; \ + memset(h->used, 0, __kh_fsize(n_buckets) * sizeof(khint32_t)); \ + h->count = 0; \ + } \ + } + +#define __KHASHL_IMPL_GET(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + SCOPE khint_t prefix##_getp_core(const HType *h, const khkey_t *key, khint_t hash) { \ + khint_t i, last, n_buckets, mask; \ + if (h->keys == 0) return 0; \ + n_buckets = (khint_t)1U << h->bits; \ + mask = n_buckets - 1U; \ + i = last = __kh_h2b(hash, h->bits); \ + while (__kh_used(h->used, i) && !__hash_eq(h->keys[i], *key)) { \ + i = (i + 1U) & mask; \ + if (i == last) return n_buckets; \ + } \ + return !__kh_used(h->used, i)? n_buckets : i; \ + } \ + SCOPE khint_t prefix##_getp(const HType *h, const khkey_t *key) { return prefix##_getp_core(h, key, __hash_fn(*key)); } \ + SCOPE khint_t prefix##_get(const HType *h, khkey_t key) { return prefix##_getp_core(h, &key, __hash_fn(key)); } + +#define __KHASHL_IMPL_RESIZE(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + SCOPE int prefix##_resize(HType *h, khint_t new_n_buckets) { \ + khint32_t *new_used = 0; \ + khint_t j = 0, x = new_n_buckets, n_buckets, new_bits, new_mask; \ + while ((x >>= 1) != 0) ++j; \ + if (new_n_buckets & (new_n_buckets - 1)) ++j; \ + new_bits = j > 2? j : 2; \ + new_n_buckets = (khint_t)1U << new_bits; \ + if (h->count > (new_n_buckets>>1) + (new_n_buckets>>2)) return 0; /* requested size is too small */ \ + new_used = (khint32_t*)kcalloc(__kh_fsize(new_n_buckets), \ + sizeof(khint32_t)); \ + if (!new_used) return -1; /* not enough memory */ \ + n_buckets = h->keys? (khint_t)1U<<h->bits : 0U; \ + if (n_buckets < new_n_buckets) { /* expand */ \ + h->keys = ruby_xrealloc2(h->keys, new_n_buckets, \ + sizeof(khkey_t)); \ + } /* otherwise shrink */ \ + new_mask = new_n_buckets - 1; \ + for (j = 0; j != n_buckets; ++j) { \ + khkey_t key; \ + if (!__kh_used(h->used, j)) continue; \ + key = h->keys[j]; \ + __kh_set_unused(h->used, j); \ + while (1) { /* kick-out process; sort of like in Cuckoo hashing */ \ + khint_t i; \ + i = __kh_h2b(__hash_fn(key), new_bits); \ + while (__kh_used(new_used, i)) i = (i + 1) & new_mask; \ + __kh_set_used(new_used, i); \ + if (i < n_buckets && __kh_used(h->used, i)) { /* kick out the existing element */ \ + { khkey_t tmp = h->keys[i]; h->keys[i] = key; key = tmp; } \ + __kh_set_unused(h->used, i); /* mark it as deleted in the old hash table */ \ + } else { /* write the element and jump out of the loop */ \ + h->keys[i] = key; \ + break; \ + } \ + } \ + } \ + if (n_buckets > new_n_buckets) /* shrink the hash table */ \ + h->keys = ruby_xrealloc2(h->keys, new_n_buckets, \ + sizeof(khkey_t)); \ + kfree(h->used); /* free the working space */ \ + h->used = new_used, h->bits = new_bits; \ + return 0; \ + } + +#define __KHASHL_IMPL_PUT(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + SCOPE khint_t prefix##_putp_core(HType *h, const khkey_t *key, khint_t hash, int *absent) { \ + khint_t n_buckets, i, last, mask; \ + n_buckets = h->keys? (khint_t)1U<<h->bits : 0U; \ + *absent = -1; \ + if (h->count >= (n_buckets>>1) + (n_buckets>>2)) { /* rehashing */ \ + if (prefix##_resize(h, n_buckets + 1U) < 0) \ + return n_buckets; \ + n_buckets = (khint_t)1U<<h->bits; \ + } /* TODO: to implement automatically shrinking; resize() already support shrinking */ \ + mask = n_buckets - 1; \ + i = last = __kh_h2b(hash, h->bits); \ + while (__kh_used(h->used, i) && !__hash_eq(h->keys[i], *key)) { \ + i = (i + 1U) & mask; \ + if (i == last) break; \ + } \ + if (!__kh_used(h->used, i)) { /* not present at all */ \ + h->keys[i] = *key; \ + __kh_set_used(h->used, i); \ + ++h->count; \ + *absent = 1; \ + } else *absent = 0; /* Don't touch h->keys[i] if present */ \ + return i; \ + } \ + SCOPE khint_t prefix##_putp(HType *h, const khkey_t *key, int *absent) { return prefix##_putp_core(h, key, __hash_fn(*key), absent); } \ + SCOPE khint_t prefix##_put(HType *h, khkey_t key, int *absent) { return prefix##_putp_core(h, &key, __hash_fn(key), absent); } + +#define __KHASHL_IMPL_DEL(SCOPE, HType, prefix, khkey_t, __hash_fn) \ + SCOPE int prefix##_del(HType *h, khint_t i) { \ + khint_t j = i, k, mask, n_buckets; \ + if (h->keys == 0) return 0; \ + n_buckets = (khint_t)1U<<h->bits; \ + mask = n_buckets - 1U; \ + while (1) { \ + j = (j + 1U) & mask; \ + if (j == i || !__kh_used(h->used, j)) break; /* j==i only when the table is completely full */ \ + k = __kh_h2b(__hash_fn(h->keys[j]), h->bits); \ + if ((j > i && (k <= i || k > j)) || (j < i && (k <= i && k > j))) \ + h->keys[i] = h->keys[j], i = j; \ + } \ + __kh_set_unused(h->used, i); \ + --h->count; \ + return 1; \ + } + +#define KHASHL_DECLARE(HType, prefix, khkey_t) \ + __KHASHL_TYPE(HType, khkey_t) \ + __KHASHL_PROTOTYPES(HType, prefix, khkey_t) + +#define KHASHL_INIT(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + __KHASHL_TYPE(HType, khkey_t) \ + __KHASHL_IMPL_BASIC(SCOPE, HType, prefix) \ + __KHASHL_IMPL_GET(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + __KHASHL_IMPL_RESIZE(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + __KHASHL_IMPL_PUT(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + __KHASHL_IMPL_DEL(SCOPE, HType, prefix, khkey_t, __hash_fn) + +/*************************** + * Ensemble of hash tables * + ***************************/ + +typedef struct { + khint_t sub, pos; +} kh_ensitr_t; + +#define KHASHE_INIT(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + KHASHL_INIT(KH_LOCAL, HType##_sub, prefix##_sub, khkey_t, __hash_fn, __hash_eq) \ + typedef struct HType { \ + khint64_t count:54, bits:8; \ + HType##_sub *sub; \ + } HType; \ + SCOPE HType *prefix##_init(int bits) { \ + HType *g; \ + g = (HType*)kcalloc(1, sizeof(*g)); \ + g->bits = bits; \ + g->sub = (HType##_sub*)kcalloc(1U<<bits, sizeof(*g->sub)); \ + return g; \ + } \ + SCOPE void prefix##_destroy(HType *g) { \ + int t; \ + if (!g) return; \ + for (t = 0; t < 1<<g->bits; ++t) { kfree((void*)g->sub[t].keys); kfree(g->sub[t].used); } \ + kfree(g->sub); kfree(g); \ + } \ + SCOPE kh_ensitr_t prefix##_getp(const HType *g, const khkey_t *key) { \ + khint_t hash, low, ret; \ + kh_ensitr_t r; \ + HType##_sub *h; \ + hash = __hash_fn(*key); \ + low = hash & ((1U<<g->bits) - 1); \ + h = &g->sub[low]; \ + ret = prefix##_sub_getp_core(h, key, hash); \ + if (ret == 1U<<h->bits) r.sub = low, r.pos = (khint_t)-1; \ + else r.sub = low, r.pos = ret; \ + return r; \ + } \ + SCOPE kh_ensitr_t prefix##_get(const HType *g, const khkey_t key) { return prefix##_getp(g, &key); } \ + SCOPE kh_ensitr_t prefix##_putp(HType *g, const khkey_t *key, int *absent) { \ + khint_t hash, low, ret; \ + kh_ensitr_t r; \ + HType##_sub *h; \ + hash = __hash_fn(*key); \ + low = hash & ((1U<<g->bits) - 1); \ + h = &g->sub[low]; \ + ret = prefix##_sub_putp_core(h, key, hash, absent); \ + if (*absent) ++g->count; \ + if (ret == 1U<<h->bits) r.sub = low, r.pos = (khint_t)-1; \ + else r.sub = low, r.pos = ret; \ + return r; \ + } \ + SCOPE kh_ensitr_t prefix##_put(HType *g, const khkey_t key, int *absent) { return prefix##_putp(g, &key, absent); } \ + SCOPE int prefix##_del(HType *g, kh_ensitr_t itr) { \ + HType##_sub *h = &g->sub[itr.sub]; \ + int ret; \ + ret = prefix##_sub_del(h, itr.pos); \ + if (ret) --g->count; \ + return ret; \ + } + +/***************************** + * More convenient interface * + *****************************/ + +#define __kh_packed __attribute__ ((__packed__)) +#define __kh_cached_hash(x) ((x).hash) + +#define KHASHL_SET_INIT(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + typedef struct { khkey_t key; } __kh_packed HType##_s_bucket_t; \ + static kh_inline khint_t prefix##_s_hash(HType##_s_bucket_t x) { return __hash_fn(x.key); } \ + static kh_inline int prefix##_s_eq(HType##_s_bucket_t x, HType##_s_bucket_t y) { return __hash_eq(x.key, y.key); } \ + KHASHL_INIT(KH_LOCAL, HType, prefix##_s, HType##_s_bucket_t, prefix##_s_hash, prefix##_s_eq) \ + SCOPE HType *prefix##_init(void) { return prefix##_s_init(); } \ + SCOPE void prefix##_destroy(HType *h) { prefix##_s_destroy(h); } \ + SCOPE void prefix##_resize(HType *h, khint_t new_n_buckets) { prefix##_s_resize(h, new_n_buckets); } \ + SCOPE khint_t prefix##_get(const HType *h, khkey_t key) { HType##_s_bucket_t t; t.key = key; return prefix##_s_getp(h, &t); } \ + SCOPE int prefix##_del(HType *h, khint_t k) { return prefix##_s_del(h, k); } \ + SCOPE khint_t prefix##_put(HType *h, khkey_t key, int *absent) { HType##_s_bucket_t t; t.key = key; return prefix##_s_putp(h, &t, absent); } + +#define KHASHL_MAP_INIT(SCOPE, HType, prefix, khkey_t, kh_val_t, __hash_fn, __hash_eq) \ + typedef struct { khkey_t key; kh_val_t val; } __kh_packed HType##_m_bucket_t; \ + static kh_inline khint_t prefix##_m_hash(HType##_m_bucket_t x) { return __hash_fn(x.key); } \ + static kh_inline int prefix##_m_eq(HType##_m_bucket_t x, HType##_m_bucket_t y) { return __hash_eq(x.key, y.key); } \ + KHASHL_INIT(KH_LOCAL, HType, prefix##_m, HType##_m_bucket_t, prefix##_m_hash, prefix##_m_eq) \ + SCOPE HType *prefix##_init(void) { return prefix##_m_init(); } \ + SCOPE void prefix##_destroy(HType *h) { prefix##_m_destroy(h); } \ + SCOPE khint_t prefix##_get(const HType *h, khkey_t key) { HType##_m_bucket_t t; t.key = key; return prefix##_m_getp(h, &t); } \ + SCOPE int prefix##_del(HType *h, khint_t k) { return prefix##_m_del(h, k); } \ + SCOPE khint_t prefix##_put(HType *h, khkey_t key, int *absent) { HType##_m_bucket_t t; t.key = key; return prefix##_m_putp(h, &t, absent); } + +#define KHASHL_CSET_INIT(SCOPE, HType, prefix, khkey_t, __hash_fn, __hash_eq) \ + typedef struct { khkey_t key; khint_t hash; } __kh_packed HType##_cs_bucket_t; \ + static kh_inline int prefix##_cs_eq(HType##_cs_bucket_t x, HType##_cs_bucket_t y) { return x.hash == y.hash && __hash_eq(x.key, y.key); } \ + KHASHL_INIT(KH_LOCAL, HType, prefix##_cs, HType##_cs_bucket_t, __kh_cached_hash, prefix##_cs_eq) \ + SCOPE HType *prefix##_init(void) { return prefix##_cs_init(); } \ + SCOPE void prefix##_destroy(HType *h) { prefix##_cs_destroy(h); } \ + SCOPE khint_t prefix##_get(const HType *h, khkey_t key) { HType##_cs_bucket_t t; t.key = key; t.hash = __hash_fn(key); return prefix##_cs_getp(h, &t); } \ + SCOPE int prefix##_del(HType *h, khint_t k) { return prefix##_cs_del(h, k); } \ + SCOPE khint_t prefix##_put(HType *h, khkey_t key, int *absent) { HType##_cs_bucket_t t; t.key = key, t.hash = __hash_fn(key); return prefix##_cs_putp(h, &t, absent); } + +#define KHASHL_CMAP_INIT(SCOPE, HType, prefix, khkey_t, kh_val_t, __hash_fn, __hash_eq) \ + typedef struct { khkey_t key; kh_val_t val; khint_t hash; } __kh_packed HType##_cm_bucket_t; \ + static kh_inline int prefix##_cm_eq(HType##_cm_bucket_t x, HType##_cm_bucket_t y) { return x.hash == y.hash && __hash_eq(x.key, y.key); } \ + KHASHL_INIT(KH_LOCAL, HType, prefix##_cm, HType##_cm_bucket_t, __kh_cached_hash, prefix##_cm_eq) \ + SCOPE HType *prefix##_init(void) { return prefix##_cm_init(); } \ + SCOPE void prefix##_destroy(HType *h) { prefix##_cm_destroy(h); } \ + SCOPE khint_t prefix##_get(const HType *h, khkey_t key) { HType##_cm_bucket_t t; t.key = key; t.hash = __hash_fn(key); return prefix##_cm_getp(h, &t); } \ + SCOPE int prefix##_del(HType *h, khint_t k) { return prefix##_cm_del(h, k); } \ + SCOPE khint_t prefix##_put(HType *h, khkey_t key, int *absent) { HType##_cm_bucket_t t; t.key = key, t.hash = __hash_fn(key); return prefix##_cm_putp(h, &t, absent); } + +#define KHASHE_MAP_INIT(SCOPE, HType, prefix, khkey_t, kh_val_t, __hash_fn, __hash_eq) \ + typedef struct { khkey_t key; kh_val_t val; } __kh_packed HType##_m_bucket_t; \ + static kh_inline khint_t prefix##_m_hash(HType##_m_bucket_t x) { return __hash_fn(x.key); } \ + static kh_inline int prefix##_m_eq(HType##_m_bucket_t x, HType##_m_bucket_t y) { return __hash_eq(x.key, y.key); } \ + KHASHE_INIT(KH_LOCAL, HType, prefix##_m, HType##_m_bucket_t, prefix##_m_hash, prefix##_m_eq) \ + SCOPE HType *prefix##_init(int bits) { return prefix##_m_init(bits); } \ + SCOPE void prefix##_destroy(HType *h) { prefix##_m_destroy(h); } \ + SCOPE kh_ensitr_t prefix##_get(const HType *h, khkey_t key) { HType##_m_bucket_t t; t.key = key; return prefix##_m_getp(h, &t); } \ + SCOPE int prefix##_del(HType *h, kh_ensitr_t k) { return prefix##_m_del(h, k); } \ + SCOPE kh_ensitr_t prefix##_put(HType *h, khkey_t key, int *absent) { HType##_m_bucket_t t; t.key = key; return prefix##_m_putp(h, &t, absent); } + +/************************** + * Public macro functions * + **************************/ + +#define kh_bucket(h, x) ((h)->keys[x]) +#define kh_size(h) ((h)->count) +#define kh_capacity(h) ((h)->keys? 1U<<(h)->bits : 0U) +#define kh_end(h) kh_capacity(h) + +#define kh_key(h, x) ((h)->keys[x].key) +#define kh_val(h, x) ((h)->keys[x].val) +#define kh_exist(h, x) __kh_used((h)->used, (x)) + +#define kh_ens_key(g, x) kh_key(&(g)->sub[(x).sub], (x).pos) +#define kh_ens_val(g, x) kh_val(&(g)->sub[(x).sub], (x).pos) +#define kh_ens_exist(g, x) kh_exist(&(g)->sub[(x).sub], (x).pos) +#define kh_ens_is_end(x) ((x).pos == (khint_t)-1) +#define kh_ens_size(g) ((g)->count) + +/************************************** + * Common hash and equality functions * + **************************************/ + +#define kh_eq_generic(a, b) ((a) == (b)) +#define kh_eq_str(a, b) (strcmp((a), (b)) == 0) +#define kh_hash_dummy(x) ((khint_t)(x)) + +static kh_inline khint_t kh_hash_uint32(khint_t key) { + key += ~(key << 15); + key ^= (key >> 10); + key += (key << 3); + key ^= (key >> 6); + key += ~(key << 11); + key ^= (key >> 16); + return key; +} + +static kh_inline khint_t kh_hash_uint64(khint64_t key) { + key = ~key + (key << 21); + key = key ^ key >> 24; + key = (key + (key << 3)) + (key << 8); + key = key ^ key >> 14; + key = (key + (key << 2)) + (key << 4); + key = key ^ key >> 28; + key = key + (key << 31); + return (khint_t)key; +} + +#define KH_FNV_SEED 11 + +static kh_inline khint_t kh_hash_str(const char *s) { /* FNV1a */ + khint_t h = KH_FNV_SEED ^ 2166136261U; + const unsigned char *t = (const unsigned char*)s; + for (; *t; ++t) + h ^= *t, h *= 16777619; + return h; +} + +static kh_inline khint_t kh_hash_bytes(int len, const unsigned char *s) { + khint_t h = KH_FNV_SEED ^ 2166136261U; + int i; + for (i = 0; i < len; ++i) + h ^= s[i], h *= 16777619; + return h; +} + +#endif /* __AC_KHASHL_H */ |