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thashmap.c
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thashmap.c
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/*-
* Copyright (c) 2012 Gleb Kurtsou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#if defined(_KERNEL)
#include <sys/systm.h>
#define ASSERT(cond) MPASS(cond)
#define THM_POOL_LOCK(pool) mtx_lock(&(pool)->tp_mtx)
#define THM_POOL_UNLOCK(pool) mtx_unlock(&(pool)->tp_mtx)
#else
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#if defined(THASHMAP_DEBUG)
#define ASSERT(cond) assert(cond)
#else
#define ASSERT(cond) ((void)0)
#endif
#if !defined(__predict_false)
#define __predict_false(cond) (cond)
#endif
#if !defined(__unused)
#define __unused
#endif
#define THM_POOL_LOCK(pool) ((void)0)
#define THM_POOL_UNLOCK(pool) ((void)0)
#endif /* !_KERNEL */
#include "thashmap.h"
/* 4096 on 64-bit archs, 2048 on 32-bit archs */
#define THM_PAGE_SIZE (128 * THM_SLOT_SIZE)
#define THM_PAGE_PTRMASK (~(uintptr_t)(THM_PAGE_SIZE - 1))
#define THM_PAGE_STRUCT_SLOTS \
((1 << howmany(sizeof(struct thm_page), THM_SLOT_SIZE)) - 1)
#define THM_PAGE_MAP1_EMPTY (~(uint64_t)THM_PAGE_STRUCT_SLOTS)
#define THM_PAGE_MAP2_EMPTY (~(uint64_t)0ULL)
#define THM_PTR_MASK_PAGE (~(uintptr_t)(THM_PAGE_SIZE - 1))
#define THM_SLOT_SIZE \
(THM_SLOT_MIN_ENTRIES * (int)sizeof(uintptr_t))
#define THM_SLOT_MAX_ENTRIES 32
#define THM_SLOT_MIN_ENTRIES 4
#define THM_SUBKEY(k, n) \
(((k) >> (THM_SUBKEY_SHIFT * (5 - n))) & THM_SUBKEY_MASK)
#define THM_SUBKEY_MASK (THM_SLOT_MAX_ENTRIES - 1)
#define THM_SUBKEY_BITIND(ind) (((ind) - 2) / 5)
#define THM_SUBKEY_SHIFT 5
#define THM_KEY_BIT(ind) (1ULL << (ind))
#define THM_COUNT_1BITS_32(a) __builtin_popcount((a))
#define THM_COUNT_1BITS_64(a) __builtin_popcountll((a))
#define THM_COUNT_LEADING_0BITS_32(a) __builtin_clz((a))
#define THM_COUNT_LEADING_0BITS_64(a) __builtin_clzll((a))
#define THM_COUNT_TRAILING_0BITS_32(a) __builtin_ctz((a))
#define THM_COUNT_TRAILING_0BITS_64(a) __builtin_ctzll((a))
#define MASK_01010101 0x5555555555555555ULL
#define MASK_01000100 0x4444444444444444ULL
#define MASK_00110011 0x3333333333333333ULL
#define MASK_11001100 0xccccccccccccccccULL
#define MASK_00001111 0x0f0f0f0f0f0f0f0fULL
#define MASK_11110000 0xf0f0f0f0f0f0f0f0ULL
#define MASK_00010000 0x1010101010101010ULL
#define MASK_00100000 0x2020202020202020ULL
#define MASK_01000000 0x4040404040404040ULL
#if !defined(CTASSERT) && defined(_Static_assert)
#define CTASSERT(cond) \
_Static_assert((cond), "compile-time assertion failed")
#elif !defined(CTASSERT)
#define CTASSERT(x) _CTASSERT(x, __LINE__)
#define _CTASSERT(x, y) __CTASSERT(x, y)
#define __CTASSERT(x, y) typedef char __assert ## y[(x) ? 1 : -1]
#endif
struct thm_page {
uint64_t tp_map1;
uint64_t tp_map2;
uintptr_t tp_q_next;
uintptr_t *tp_q_prevp;
};
struct thm_slot {
uintptr_t ts_map;
uintptr_t ts_entry[0];
};
struct thm_slotmax {
uintptr_t ts_entry[0];
};
static struct thm_slot *thm_slot_alloc(struct thm_pool *pool, u_int slen,
void *hint);
static struct thm_slot *thm_slot_alloc_zero(struct thm_pool *pool, u_int slen,
void *hint);
static __inline void thm_slot_free(struct thm_pool *pool, struct thm_slot *slot,
u_int slen);
static int thm_slot_tryextend(struct thm_pool *pool, struct thm_slot *slot,
u_int slen_old, u_int slen_new);
static void thm_slot_shrink(struct thm_pool *pool, struct thm_slot *slot,
u_int slen_old, u_int slen_new);
static void thm_slotmax_fix_extend(struct thm_slot *slot_old,
struct thm_slotmax *slotmax);
static __inline u_int thm_slot_get_slen(struct thm_slot *slot);
static struct thm_page *thm_page_alloc(struct thm_pool *pool);
static void thm_page_free(struct thm_pool *pool, struct thm_page *);
static __inline struct thm_page *thm_pool_first(struct thm_pool *pool,
u_int rank);
static __inline struct thm_page *thm_pool_next(struct thm_page *page);
static __inline void thm_pool_insert_head(struct thm_pool *pool, u_int rank,
struct thm_page *page);
static __inline void thm_pool_insert_tail(struct thm_pool *pool, u_int rank,
struct thm_page *page);
static __inline void thm_pool_remove(struct thm_pool *pool, u_int rank,
struct thm_page *page);
CTASSERT(THM_PAGE_STRUCT_SLOTS == 0x1 || THM_PAGE_STRUCT_SLOTS == 0x3);
void
thm_pool_init(struct thm_pool *pool, const char *name __unused)
{
struct thm_pool_queue *qhead;
u_int rank;
#if defined(_KERNEL)
mtx_init(&pool->tp_mtx, "thm_pool", NULL, MTX_DEF);
pool->tp_zone = uma_zcreate(__DECONST(char *, name), THM_PAGE_SIZE,
NULL, NULL, NULL, NULL, THM_PAGE_SIZE - 1, 0);
#endif
for (rank = 0; rank < THM_POOL_RANK_MAX; rank++) {
qhead = &pool->tp_queue[rank];
qhead->tpq_first = 0;
qhead->tpq_last = &qhead->tpq_first;
}
thm_pool_new_block(pool);
}
void
thm_pool_destroy(struct thm_pool *pool)
{
struct thm_page *page;
u_int rank;
for (rank = 0; rank < THM_POOL_RANK_MAX; rank++) {
while ((page = thm_pool_first(pool, rank)) != NULL) {
thm_pool_remove(pool, rank, page);
thm_page_free(pool, page);
}
}
#if defined(_KERNEL)
mtx_destroy(&pool->tp_mtx);
uma_zdestroy(pool->tp_zone);
#endif
}
void
thm_pool_new_block(struct thm_pool *pool)
{
struct thm_page *page;
page = thm_page_alloc(pool);
THM_POOL_LOCK(pool);
thm_pool_insert_head(pool, THM_POOL_RANK_MAX - 1, page);
THM_POOL_UNLOCK(pool);
}
void
thm_head_init(struct thm_head *head, struct thm_pool *pool, int keyoffset)
{
ASSERT((keyoffset & 0x3) == 0);
head->th_pool = pool;
head->th_keyoffset = keyoffset / sizeof(uint32_t);
head->th_root = (uintptr_t)thm_slot_alloc_zero(pool, 1, NULL);
}
void
thm_head_destroy(struct thm_head *head)
{
struct thm_slot *slot = thm_ptr_get_value(head->th_root);
u_int slen;
slen = thm_slot_get_slen(slot);
thm_slot_free(head->th_pool, slot, slen);
}
static __inline struct thm_page *
thm_ptr_get_page(uintptr_t ptr)
{
return ((struct thm_page *)(ptr & THM_PTR_MASK_PAGE));
}
static __inline uintptr_t
thm_ptr_get_pageflag(uintptr_t ptr)
{
return (ptr & ~THM_PTR_MASK_PAGE);
}
static __inline void
thm_ptr_init_page(uintptr_t *ptr, void *addr, u_int flag)
{
ASSERT((flag & THM_PTR_MASK_PAGE) == 0);
*ptr = (((uintptr_t)addr) & THM_PTR_MASK_PAGE) |
thm_ptr_get_pageflag(flag);
}
static __inline void
thm_ptr_set_page(uintptr_t *ptr, void *addr)
{
thm_ptr_init_page(ptr, addr, *ptr & ~THM_PTR_MASK_PAGE);
}
static __inline void
thm_ptr_set_slot(uintptr_t *ptr, struct thm_slot *slot)
{
ASSERT((((uintptr_t)slot) & THM_PTR_MASK_RESERVED) == 0);
*ptr = (*ptr & THM_PTR_MASK_SLEN) | THM_PTR_MASK_SLOT |
(uintptr_t)slot;
}
static __inline void
thm_ptr_set_value(uintptr_t *ptr, void *value)
{
ASSERT((((uintptr_t)value) & THM_PTR_MASK_RESERVED) == 0);
*ptr = (*ptr & THM_PTR_MASK_SLEN) | (uintptr_t)value;
}
static __inline struct thm_page *
thm_addr_get_page(void *addr)
{
return (thm_ptr_get_page((uintptr_t)addr));
}
static __inline void
thm_bucket_set(uintptr_t *ptr, struct thm_entry *entry)
{
/* Dont trash entry->te_next */
thm_ptr_set_value(ptr, entry);
}
static __inline void
thm_bucket_insert(uintptr_t *ptr, struct thm_entry *entry)
{
entry->te_next = thm_ptr_get_value(*ptr);
thm_ptr_set_value(ptr, entry);
}
static __inline void
thm_bucket_remove(uintptr_t *ptr, struct thm_entry *entry)
{
struct thm_entry *i;
i = thm_ptr_get_value(*ptr);
if (entry == i) {
thm_ptr_set_value(ptr, entry->te_next);
return;
}
while (i->te_next != entry)
i = i->te_next;
i->te_next = entry->te_next;
}
static __inline uint32_t
thm_entry_get_key(struct thm_head *head, struct thm_entry *entry)
{
uint32_t *keyp;
keyp = (uint32_t *)entry + head->th_keyoffset;
return (*keyp & THM_KEY_MASK);
}
static __inline uintptr_t *
thm_slotmax_entry(struct thm_slot *slot, u_int ind)
{
struct thm_slotmax *slotmax = (struct thm_slotmax *)slot;
return (&slotmax->ts_entry[ind]);
}
static __inline u_int
thm_slot_get_slen(struct thm_slot *slot)
{
u_int slen;
slen = (((slot->ts_entry[0] & THM_PTR_MASK_SLEN) >> 1) |
(slot->ts_entry[1] & THM_PTR_MASK_SLEN) |
((slot->ts_entry[2] & THM_PTR_MASK_SLEN) << 1)) + 1;
return (slen);
}
static __inline void
thm_slot_set_slen(struct thm_slot *slot, u_int slen)
{
slen -= 1;
slot->ts_entry[0] = (slot->ts_entry[0] & ~THM_PTR_MASK_SLEN) |
((slen << 1) & THM_PTR_MASK_SLEN);
slot->ts_entry[1] = (slot->ts_entry[1] & ~THM_PTR_MASK_SLEN) |
(slen & THM_PTR_MASK_SLEN);
slot->ts_entry[2] = (slot->ts_entry[2] & ~THM_PTR_MASK_SLEN) |
((slen >> 1) & THM_PTR_MASK_SLEN);
}
static __inline void
thm_cursor_push(struct thm_cursor *cr, uintptr_t *entp)
{
cr->tc_level++;
ASSERT(cr->tc_level < THM_SUBKEY_MAX + 1);
cr->tc_path[cr->tc_level] = entp;
}
int
thm_empty(struct thm_head *head)
{
struct thm_slot *slot;
uintptr_t *entp;
slot = thm_ptr_get_value(head->th_root);
if (thm_slot_get_slen(slot) == THM_SLEN_MAX) {
for (u_int i = 0; i < THM_SLOT_MAX_ENTRIES; i++) {
entp = thm_slotmax_entry(slot, i);
if (thm_ptr_get_value(*entp) != NULL)
return (0);
}
return (1);
}
return (slot->ts_map == 0);
}
static struct thm_bucket *
thm_first_impl(struct thm_cursor *cr)
{
struct thm_slot *slot;
void *entval;
uintptr_t *entp;
entval = thm_ptr_get_value(*cr->tc_path[cr->tc_level]);
do {
slot = entval;
if (thm_slot_get_slen(slot) == THM_SLEN_MAX) {
for (int i = 0; i < THM_SLOT_MAX_ENTRIES; i++) {
entp = thm_slotmax_entry(slot, i);
if (thm_ptr_get_value(*entp) != NULL)
goto found;
}
return (NULL);
}
if (slot->ts_map == 0)
return (NULL);
entp = &slot->ts_entry[0];
found:
thm_cursor_push(cr, entp);
entval = thm_ptr_get_value(*entp);
} while ((*entp & THM_PTR_MASK_SLOT) != 0);
return (entval);
}
struct thm_bucket *
thm_first(struct thm_head *head, struct thm_cursor *cr)
{
struct thm_cursor xcr;
struct thm_bucket *bucket;
if (cr == NULL)
cr = &xcr;
cr->tc_level = 0;
cr->tc_path[0] = &head->th_root;
bucket = thm_first_impl(cr);
ASSERT(bucket != NULL || cr->tc_level == 0);
return (bucket);
}
static struct thm_bucket *
thm_last_impl(struct thm_cursor *cr)
{
struct thm_slot *slot;
void *entval;
uintptr_t *entp;
int i;
entval = thm_ptr_get_value(*cr->tc_path[cr->tc_level]);
do {
slot = entval;
if (thm_slot_get_slen(slot) == THM_SLEN_MAX) {
for (i = THM_SLOT_MAX_ENTRIES - 1; i >= 0; i--) {
entp = thm_slotmax_entry(slot, i);
if (thm_ptr_get_value(*entp) != NULL)
goto found;
}
return (NULL);
}
if (slot->ts_map == 0)
return (NULL);
i = THM_COUNT_1BITS_32(slot->ts_map);
entp = &slot->ts_entry[i - 1];
found:
thm_cursor_push(cr, entp);
entval = thm_ptr_get_value(*entp);
} while ((*entp & THM_PTR_MASK_SLOT) != 0);
return (entval);
}
struct thm_bucket *
thm_last(struct thm_head *head, struct thm_cursor *cr)
{
struct thm_cursor xcr;
struct thm_bucket *bucket;
if (cr == NULL)
cr = &xcr;
cr->tc_level = 0;
cr->tc_path[0] = &head->th_root;
bucket = thm_last_impl(cr);
ASSERT(bucket != NULL || cr->tc_level == 0);
return (bucket);
}
static uintptr_t *
thm_next_step(struct thm_slot *slot, uintptr_t *entp)
{
int count, i;
if (thm_slot_get_slen(slot) == THM_SLEN_MAX) {
i = entp - thm_slotmax_entry(slot, 0);
ASSERT(i >= 0 && i < THM_SLOT_MAX_ENTRIES);
for (i += 1; i < THM_SLOT_MAX_ENTRIES; i++) {
entp = thm_slotmax_entry(slot, i);
if (thm_ptr_get_value(*entp) != NULL)
return (entp);
}
return (NULL);
}
count = THM_COUNT_1BITS_32(slot->ts_map);
i = entp - slot->ts_entry;
ASSERT(i >= 0 && i < count);
if (i + 1 >= count)
return (NULL);
entp = &slot->ts_entry[i + 1];
return (entp);
}
struct thm_bucket *
thm_next(struct thm_cursor *cr)
{
struct thm_slot *slot;
uintptr_t *entp;
ASSERT(cr->tc_level > 0 && cr->tc_level < THM_SUBKEY_MAX + 1);
for (; cr->tc_level > 0; cr->tc_level--) {
ASSERT(*cr->tc_path[cr->tc_level - 1] & THM_PTR_MASK_SLOT ||
cr->tc_level == 1);
slot = thm_ptr_get_value(*cr->tc_path[cr->tc_level - 1]);
entp = thm_next_step(slot, cr->tc_path[cr->tc_level]);
if (entp == NULL)
continue;
cr->tc_path[cr->tc_level] = entp;
if ((*entp & THM_PTR_MASK_SLOT) == 0)
return (thm_ptr_get_value(*entp));
else
return (thm_first_impl(cr));
}
return (NULL);
}
static uintptr_t *
thm_prev_step(struct thm_slot *slot, uintptr_t *entp)
{
int i;
if (thm_slot_get_slen(slot) == THM_SLEN_MAX) {
i = entp - thm_slotmax_entry(slot, 0);
ASSERT(i >= 0 && i < THM_SLOT_MAX_ENTRIES);
for (i -= 1; i >= 0; i--) {
entp = thm_slotmax_entry(slot, i);
if (thm_ptr_get_value(*entp) != NULL)
return (entp);
}
return (NULL);
}
i = entp - slot->ts_entry;
ASSERT(i >= 0);
if (i == 0)
return (NULL);
entp = &slot->ts_entry[i - 1];
return (entp);
}
struct thm_bucket *
thm_prev(struct thm_cursor *cr)
{
struct thm_slot *slot;
uintptr_t *entp;
ASSERT(cr->tc_level > 0 && cr->tc_level < THM_SUBKEY_MAX + 1);
for (; cr->tc_level > 0; cr->tc_level--) {
ASSERT(*cr->tc_path[cr->tc_level - 1] & THM_PTR_MASK_SLOT ||
cr->tc_level == 1);
slot = thm_ptr_get_value(*cr->tc_path[cr->tc_level - 1]);
entp = thm_prev_step(slot, cr->tc_path[cr->tc_level]);
if (entp == NULL)
continue;
cr->tc_path[cr->tc_level] = entp;
if ((*entp & THM_PTR_MASK_SLOT) == 0)
return (thm_ptr_get_value(*entp));
else
return (thm_last_impl(cr));
}
return (NULL);
}
static uintptr_t *
thm_find_step(struct thm_slot *slot, u_int key)
{
uintptr_t *entp;
uint32_t keybit, smap;
u_int keyind, slen;
ASSERT(key < THM_SLOT_MAX_ENTRIES);
slen = thm_slot_get_slen(slot);
if (slen == THM_SLEN_MAX) {
entp = thm_slotmax_entry(slot, key);
if (thm_ptr_get_value(*entp) == NULL)
return (NULL);
return (entp);
}
smap = slot->ts_map;
keybit = THM_KEY_BIT(key);
if ((smap & keybit) == 0)
return (NULL);
smap &= keybit - 1;
keyind = THM_COUNT_1BITS_32(smap);
return (&slot->ts_entry[keyind]);
}
static struct thm_bucket *
thm_find_impl(struct thm_head *head, uint32_t key, struct thm_cursor *cr)
{
uintptr_t *entp;
void *entval;
cr->tc_path[0] = &head->th_root;
entval = thm_ptr_get_value(head->th_root);
entp = thm_find_step(entval, THM_SUBKEY(key, 0));
if (entp == NULL) {
cr->tc_level = 0;
return (NULL);
}
cr->tc_path[1] = entp;
entval = thm_ptr_get_value(*entp);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
cr->tc_level = 1;
goto found;
}
entp = thm_find_step(entval, THM_SUBKEY(key, 1));
if (entp == NULL) {
cr->tc_level = 1;
return (NULL);
}
cr->tc_path[2] = entp;
entval = thm_ptr_get_value(*entp);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
cr->tc_level = 2;
goto found;
}
entp = thm_find_step(entval, THM_SUBKEY(key, 2));
if (entp == NULL) {
cr->tc_level = 2;
return (NULL);
}
cr->tc_path[3] = entp;
entval = thm_ptr_get_value(*entp);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
cr->tc_level = 3;
goto found;
}
entp = thm_find_step(entval, THM_SUBKEY(key, 3));
if (entp == NULL) {
cr->tc_level = 3;
return (NULL);
}
cr->tc_path[4] = entp;
entval = thm_ptr_get_value(*entp);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
cr->tc_level = 4;
goto found;
}
entp = thm_find_step(entval, THM_SUBKEY(key, 4));
if (entp == NULL) {
cr->tc_level = 4;
return (NULL);
}
cr->tc_path[5] = entp;
entval = thm_ptr_get_value(*entp);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
cr->tc_level = 5;
goto found;
}
entp = thm_find_step(entval, THM_SUBKEY(key, 5));
if (entp == NULL) {
cr->tc_level = 5;
return (NULL);
}
cr->tc_path[6] = entp;
entval = thm_ptr_get_value(*entp);
ASSERT((*entp & THM_PTR_MASK_SLOT) == 0);
cr->tc_level = 6;
found:
if (key != thm_entry_get_key(head, entval)) {
cr->tc_level--;
return (NULL);
}
return (entval);
}
struct thm_bucket *
thm_find(struct thm_head *head, uint32_t key, struct thm_cursor *cr)
{
struct thm_cursor xcr;
key &= THM_KEY_MASK;
if (cr == NULL)
cr = &xcr;
return (thm_find_impl(head, key, cr));
}
struct thm_bucket *
thm_nfind(struct thm_head *head, uint32_t key, struct thm_cursor *cr)
{
struct thm_cursor xcr;
struct thm_slot *slot;
uintptr_t *entp;
void *entval;
uint32_t keybit, smap;
u_int subkey;
int count, i;
if (cr == NULL)
cr = &xcr;
key &= THM_KEY_MASK;
entval = thm_find_impl(head, key, cr);
if (entval != NULL)
return (entval);
restart:
subkey = THM_SUBKEY(key, cr->tc_level);
slot = thm_ptr_get_value(*cr->tc_path[cr->tc_level]);
if (thm_slot_get_slen(slot) == THM_SLEN_MAX) {
entp = thm_slotmax_entry(slot, subkey);
if (thm_ptr_get_value(*entp) != NULL)
goto found_eq;
for (i = subkey + 1; i < THM_SLOT_MAX_ENTRIES; i++) {
entp = thm_slotmax_entry(slot, i);
if (thm_ptr_get_value(*entp) != NULL)
goto found_gt;
}
} else {
smap = slot->ts_map;
if (smap == 0) {
ASSERT(cr->tc_level == 0);
return (NULL);
}
count = THM_COUNT_1BITS_32(smap);
keybit = THM_KEY_BIT(subkey);
i = THM_COUNT_1BITS_32(smap & (keybit - 1));
if (i < count) {
entp = &slot->ts_entry[i];
if ((smap & keybit) != 0)
goto found_eq;
else
goto found_gt;
}
}
/* back track */
entval = thm_next(cr);
goto done;
found_gt:
if ((*entp & THM_PTR_MASK_SLOT) != 0) {
thm_cursor_push(cr, entp);
entval = thm_first_impl(cr);
} else {
entval = thm_ptr_get_value(*entp);
ASSERT(thm_entry_get_key(head, entval) > key);
}
goto done;
found_eq:
thm_cursor_push(cr, entp);
if ((*entp & THM_PTR_MASK_SLOT) != 0)
goto restart;
else {
entval = thm_ptr_get_value(*entp);
if (thm_entry_get_key(head, entval) < key)
entval = thm_next(cr);
}
done:
ASSERT(entval == NULL || thm_entry_get_key(head, entval) > key);
return (entval);
}
static uintptr_t *
thm_insert_step(struct thm_pool *pool, uintptr_t *slotp, u_int key)
{
struct thm_slot *slot, *oslot;
uint32_t keyind, smap;
u_int count, keybit, slen;
ASSERT(key < THM_SLOT_MAX_ENTRIES);
slot = thm_ptr_get_value(*slotp);
slen = thm_slot_get_slen(slot);
if (slen == THM_SLEN_MAX)
return (thm_slotmax_entry(slot, key));
smap = slot->ts_map;
keybit = THM_KEY_BIT(key);
keyind = THM_COUNT_1BITS_32(smap & (keybit - 1));
if ((smap & keybit) != 0)
return (&slot->ts_entry[keyind]);
/* Insert new entry */
count = THM_COUNT_1BITS_32(smap);
ASSERT(count + 1 <= slen * THM_SLOT_MIN_ENTRIES);
if (count + 1 + 1 > slen * THM_SLOT_MIN_ENTRIES &&
thm_slot_tryextend(pool, slot, slen, slen + 1)) {
slen += 1;
if (slen == THM_SLEN_MAX)
return (thm_slotmax_entry(slot, key));
}
if (count + 1 + 1 <= slen * THM_SLOT_MIN_ENTRIES) {
slot->ts_map |= keybit;
for (u_int i = count; i > keyind; i--)
slot->ts_entry[i] = slot->ts_entry[i - 1];
slot->ts_entry[keyind] = 0;
if (keyind < 3)
thm_slot_set_slen(slot, slen);
ASSERT((u_int)THM_COUNT_1BITS_32(slot->ts_map) + 1 <=
slen * THM_SLOT_MIN_ENTRIES);
return (&slot->ts_entry[keyind]);
}
/* Allocate larger slot */
oslot = slot;
slot = thm_slot_alloc(pool, slen + 1, oslot);
if (slot == NULL)
return (NULL);
thm_ptr_set_slot(slotp, slot);
slen += 1;
if (slen == THM_SLEN_MAX) {
thm_slotmax_fix_extend(oslot, (struct thm_slotmax *)slot);
thm_slot_free(pool, oslot, slen - 1);
return (thm_slotmax_entry(slot, key));
}
slot->ts_map = oslot->ts_map | keybit;
for (u_int i = 0; i < keyind; i++)
slot->ts_entry[i] = oslot->ts_entry[i];
slot->ts_entry[keyind] = 0;
for (u_int i = keyind; i < count; i++)
slot->ts_entry[i + 1] = oslot->ts_entry[i];
thm_slot_set_slen(slot, slen);
thm_slot_free(pool, oslot, slen - 1);
ASSERT((u_int)THM_COUNT_1BITS_32(slot->ts_map) + 1 <=
slen * THM_SLOT_MIN_ENTRIES);
return (&slot->ts_entry[keyind]);
}
static uintptr_t *
thm_insert_mkslot(struct thm_pool *pool, uintptr_t *slotp_top, u_int subkey_n,
struct thm_entry *entry1, u_int key1,
struct thm_entry *entry2, u_int key2)
{
struct thm_slot *slot;
uintptr_t *ent1, *ent2, *slotp;
u_int nslots, subkey1, subkey2;
slotp = slotp_top;
nslots = THM_COUNT_LEADING_0BITS_32(key1 ^ key2);
nslots = THM_SUBKEY_BITIND(nslots) - subkey_n + 1;
ASSERT(nslots >= 1);
slot = thm_slot_alloc(pool, nslots, slotp);
if (slot == NULL)
return (NULL);
memset(slot, 0, nslots * THM_SLOT_SIZE);
nested:
subkey1 = THM_SUBKEY(key1, subkey_n);
subkey2 = THM_SUBKEY(key2, subkey_n);
if (subkey1 == subkey2) {
slot->ts_map = (1 << subkey1);
thm_ptr_set_slot(slotp, slot);
slotp = &slot->ts_entry[0];
slot = (struct thm_slot *)((uintptr_t *)slot +
THM_SLOT_MIN_ENTRIES);
subkey_n++;
goto nested;
}
slot->ts_map = (1 << subkey1) | (1 << subkey2);
thm_ptr_set_slot(slotp, slot);
if (key1 < key2) {
ent1 = &slot->ts_entry[0];
ent2 = &slot->ts_entry[1];
} else {
ent1 = &slot->ts_entry[1];
ent2 = &slot->ts_entry[0];
}
thm_bucket_insert(ent1, entry1);
thm_bucket_set(ent2, entry2);
return (ent1);
}
struct thm_bucket *
thm_insert(struct thm_head *head, struct thm_entry *entry)
{
struct thm_pool *pool;
struct thm_entry *xentry;
uintptr_t *parentp, *entp;
uint32_t key, xkey;
u_int subkey_n;
pool = head->th_pool;
key = thm_entry_get_key(head, entry);
parentp = &head->th_root;
entp = thm_insert_step(pool, parentp, THM_SUBKEY(key, 0));
if (entp == NULL)
return (NULL);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
subkey_n = 0;
goto found;
}
parentp = entp;
entp = thm_insert_step(pool, parentp, THM_SUBKEY(key, 1));
if (entp == NULL)
return (NULL);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
subkey_n = 1;
goto found;
}
parentp = entp;
entp = thm_insert_step(pool, parentp, THM_SUBKEY(key, 2));
if (entp == NULL)
return (NULL);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
subkey_n = 2;
goto found;
}
parentp = entp;
entp = thm_insert_step(pool, parentp, THM_SUBKEY(key, 3));
if (entp == NULL)
return (NULL);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
subkey_n = 3;
goto found;
}
parentp = entp;
entp = thm_insert_step(pool, parentp, THM_SUBKEY(key, 4));
if (entp == NULL)
return (NULL);
if ((*entp & THM_PTR_MASK_SLOT) == 0) {
subkey_n = 4;
goto found;
}
parentp = entp;
entp = thm_insert_step(pool, parentp, THM_SUBKEY(key, 5));
if (entp == NULL)
return (NULL);
ASSERT((*entp & THM_PTR_MASK_SLOT) == 0);
subkey_n = 5;
found:
if ((xentry = thm_ptr_get_value(*entp)) != NULL &&
(xkey = thm_entry_get_key(head, xentry)) != key) {
entp = thm_insert_mkslot(pool, entp, subkey_n + 1,
entry, key, xentry, xkey);
if (entp == NULL)
return (NULL);
return (thm_ptr_get_value(*entp));
}
thm_bucket_insert(entp, entry);
return (thm_ptr_get_value(*entp));
}
static int
thm_remove_step(struct thm_pool *pool, struct thm_slot *slot, uintptr_t *entp,
u_int key)