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mir-htab.h
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mir-htab.h
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/* This file is a part of MIR project.
Copyright (C) 2018-2020 Vladimir Makarov <[email protected]>.
*/
#ifndef MIR_HTAB_H
#define MIR_HTAB_H
#include "mir-varr.h"
#define FALSE 0
#define TRUE 1
#if !defined(VARR_ENABLE_CHECKING) && !defined(NDEBUG)
#define VARR_ENABLE_CHECKING
#endif
#ifndef HTAB_ENABLE_CHECKING
#define HTAB_ASSERT(EXPR, OP, T) ((void) (EXPR))
#else
static inline void mir_htab_assert_fail (const char *op, const char *var) {
fprintf (stderr, "wrong %s for %s\n", op, var);
assert (0);
}
#define HTAB_ASSERT(EXPR, OP, T) (void) ((EXPR) ? 0 : (mir_htab_assert_fail (OP, #T), 0))
#endif
#ifdef __GNUC__
#define MIR_HTAB_UNUSED __attribute__ ((unused))
#define MIR_HTAB_NO_RETURN __attribute__ ((noreturn))
#else
#define MIR_HTAB_UNUSED
#define MIR_HTAB_NO_RETURN
#endif
static inline void MIR_HTAB_NO_RETURN mir_htab_error (const char *message) {
#ifdef MIR_HTAB_ERROR
MIR_HTAB_ERROR (message);
assert (FALSE);
#else
fprintf (stderr, "%s\n", message);
#endif
exit (1);
}
/*---------------- Typed hash table -----------------------------*/
typedef unsigned htab_ind_t;
typedef unsigned htab_size_t;
typedef unsigned htab_hash_t;
#define HTAB_EMPTY_IND (~(htab_ind_t) 0)
#define HTAB_DELETED_IND (HTAB_EMPTY_IND - 1)
#define HTAB_DELETED_HASH 0
enum htab_action { HTAB_FIND, HTAB_INSERT, HTAB_REPLACE, HTAB_DELETE };
#define HTAB(T) HTAB_##T
#define HTAB_OP(T, OP) HTAB_##T##_##OP
#define HTAB_OP_DEF(T, OP) MIR_HTAB_UNUSED HTAB_OP (T, OP)
DEF_VARR (htab_ind_t)
#define HTAB_EL(T) HTAB_EL_##T
#define HTAB_T(T) \
typedef struct HTAB_EL (T) { \
htab_hash_t hash; \
T el; \
} HTAB_EL (T); \
DEF_VARR (HTAB_EL (T)) \
typedef struct { \
htab_size_t els_num, els_start, els_bound, collisions; \
void *arg; \
htab_hash_t (*hash_func) (T el, void *arg); \
int (*eq_func) (T el1, T el2, void *arg); \
void (*free_func) (T el, void *arg); \
VARR (HTAB_EL (T)) * els; \
VARR (htab_ind_t) * entries; \
} HTAB (T);
#define DEF_HTAB(T) \
HTAB_T (T) \
\
static inline void HTAB_OP_DEF (T, create) (HTAB (T) * *htab, htab_size_t min_size, \
htab_hash_t (*hash_func) (T el, void *arg), \
int (*eq_func) (T el1, T el2, void *arg), \
void (*free_func) (T el, void *arg), void *arg) { \
HTAB (T) * ht; \
htab_size_t i, size; \
\
for (size = 2; min_size > size; size *= 2) \
; \
ht = malloc (sizeof (*ht)); \
if (ht == NULL) mir_htab_error ("htab: no memory"); \
VARR_CREATE (HTAB_EL (T), ht->els, size); \
VARR_TAILOR (HTAB_EL (T), ht->els, size); \
VARR_CREATE (htab_ind_t, ht->entries, 2 * size); \
ht->arg = arg; \
ht->hash_func = hash_func; \
ht->eq_func = eq_func; \
ht->free_func = free_func; \
ht->els_num = ht->els_start = ht->els_bound = ht->collisions = 0; \
for (i = 0; i < 2 * size; i++) VARR_PUSH (htab_ind_t, ht->entries, HTAB_EMPTY_IND); \
*htab = ht; \
} \
\
static inline void HTAB_OP_DEF (T, clear) (HTAB (T) * htab) { \
htab_ind_t *addr; \
htab_size_t i, size; \
HTAB_EL (T) * els_addr; \
void *arg; \
\
HTAB_ASSERT (htab != NULL, "clear", T); \
arg = htab->arg; \
if (htab->free_func != NULL) { \
els_addr = VARR_ADDR (HTAB_EL (T), htab->els); \
size = VARR_LENGTH (HTAB_EL (T), htab->els); \
for (i = 0; i < htab->els_bound; i++) \
if (els_addr[i].hash != HTAB_DELETED_HASH) htab->free_func (els_addr[i].el, arg); \
} \
htab->els_num = htab->els_start = htab->els_bound = 0; \
addr = VARR_ADDR (htab_ind_t, htab->entries); \
size = VARR_LENGTH (htab_ind_t, htab->entries); \
for (i = 0; i < size; i++) addr[i] = HTAB_EMPTY_IND; \
} \
\
static inline void HTAB_OP_DEF (T, destroy) (HTAB (T) * *htab) { \
HTAB_ASSERT (*htab != NULL, "destroy", T); \
if ((*htab)->free_func != NULL) HTAB_OP (T, clear) (*htab); \
VARR_DESTROY (HTAB_EL (T), (*htab)->els); \
VARR_DESTROY (htab_ind_t, (*htab)->entries); \
free (*htab); \
*htab = NULL; \
} \
\
static inline int HTAB_OP_DEF (T, do) (HTAB (T) * htab, T el, enum htab_action action, \
T * res) { \
htab_ind_t ind, el_ind, *entry, *first_deleted_entry = NULL; \
htab_hash_t hash, peterb; \
htab_size_t els_size, size, mask, start, bound, i; \
htab_ind_t *addr; \
HTAB_EL (T) * els_addr; \
void *arg; \
\
HTAB_ASSERT (htab != NULL, "do htab", T); \
size = VARR_LENGTH (htab_ind_t, htab->entries); \
els_size = VARR_LENGTH (HTAB_EL (T), htab->els); \
arg = htab->arg; \
HTAB_ASSERT (els_size * 2 == size, "do size", T); \
if ((action == HTAB_INSERT || action == HTAB_REPLACE) && htab->els_bound == els_size) { \
size *= 2; \
VARR_TAILOR (htab_ind_t, htab->entries, size); \
addr = VARR_ADDR (htab_ind_t, htab->entries); \
for (i = 0; i < size; i++) addr[i] = HTAB_EMPTY_IND; \
VARR_TAILOR (HTAB_EL (T), htab->els, els_size * 2); \
els_addr = VARR_ADDR (HTAB_EL (T), htab->els); \
start = htab->els_start; \
bound = htab->els_bound; \
htab->els_start = htab->els_bound = htab->els_num = 0; \
for (i = start; i < bound; i++) \
if (els_addr[i].hash != HTAB_DELETED_HASH) { \
HTAB_OP (T, do) (htab, els_addr[i].el, HTAB_INSERT, res); \
HTAB_ASSERT ((*htab->eq_func) (*res, els_addr[i].el, arg), "do expand", T); \
} \
HTAB_ASSERT (bound - start >= htab->els_bound, "do bound", T); \
} \
mask = size - 1; \
hash = (*htab->hash_func) (el, arg); \
if (hash == HTAB_DELETED_HASH) hash += 1; \
peterb = hash; \
ind = hash & mask; \
addr = VARR_ADDR (htab_ind_t, htab->entries); \
els_addr = VARR_ADDR (HTAB_EL (T), htab->els); \
for (;; htab->collisions++) { \
entry = addr + ind; \
el_ind = *entry; \
if (el_ind != HTAB_EMPTY_IND) { \
if (el_ind == HTAB_DELETED_IND) { \
first_deleted_entry = entry; \
} else if (els_addr[el_ind].hash == hash \
&& (*htab->eq_func) (els_addr[el_ind].el, el, arg)) { \
if (action == HTAB_REPLACE) { \
if (htab->free_func != NULL) htab->free_func (els_addr[el_ind].el, arg); \
els_addr[el_ind].el = el; \
} \
if (action != HTAB_DELETE) { \
*res = els_addr[el_ind].el; \
} else { \
htab->els_num--; \
*entry = HTAB_DELETED_IND; \
if (htab->free_func != NULL) htab->free_func (els_addr[el_ind].el, arg); \
els_addr[el_ind].hash = HTAB_DELETED_HASH; \
} \
return TRUE; \
} \
} else { \
if (action == HTAB_INSERT || action == HTAB_REPLACE) { \
htab->els_num++; \
if (first_deleted_entry != NULL) entry = first_deleted_entry; \
els_addr[htab->els_bound].hash = hash; \
els_addr[htab->els_bound].el = el; \
*entry = htab->els_bound++; \
*res = el; \
} \
return FALSE; \
} \
peterb >>= 11; \
ind = (5 * ind + peterb + 1) & mask; \
} \
} \
\
static inline htab_size_t HTAB_OP_DEF (T, els_num) (HTAB (T) * htab) { \
HTAB_ASSERT (htab != NULL, "els_num", T); \
return htab->els_num; \
} \
static inline htab_size_t HTAB_OP_DEF (T, collisions) (HTAB (T) * htab) { \
HTAB_ASSERT (htab != NULL, "collisions", T); \
return htab->collisions; \
} \
\
static inline void HTAB_OP_DEF (T, foreach_elem) (HTAB (T) * htab, \
void (*func) (T el, void *arg), void *arg) { \
htab_size_t i; \
HTAB_EL (T) * els_addr; \
\
HTAB_ASSERT (htab != NULL, "foreach_elem", T); \
els_addr = VARR_ADDR (HTAB_EL (T), htab->els); \
for (i = 0; i < htab->els_bound; i++) \
if (els_addr[i].hash != HTAB_DELETED_HASH) func (els_addr[i].el, arg); \
}
#define HTAB_CREATE(T, V, S, H, EQ, A) (HTAB_OP (T, create) (&(V), S, H, EQ, NULL, A))
#define HTAB_CREATE_WITH_FREE_FUNC(T, V, S, H, EQ, F, A) \
(HTAB_OP (T, create) (&(V), S, H, EQ, F, A))
#define HTAB_CLEAR(T, V) (HTAB_OP (T, clear) (V))
#define HTAB_DESTROY(T, V) (HTAB_OP (T, destroy) (&(V)))
/* It returns TRUE if the element existed in the table. */
#define HTAB_DO(T, V, EL, A, TAB_EL) (HTAB_OP (T, do) (V, EL, A, &(TAB_EL)))
#define HTAB_ELS_NUM(T, V) (HTAB_OP (T, els_num) (V))
#define HTAB_COLLISIONS(T, V) (HTAB_OP (T, collisions) (V))
#define HTAB_FOREACH_ELEM(T, V, F, A) (HTAB_OP (T, foreach_elem) (V, F, A))
#endif /* #ifndef MIR_HTAB_H */