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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2014-2017. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#ifndef __ERL_MAP_H__
#define __ERL_MAP_H__
#include "sys.h"
/* instrinsic wrappers */
#if ERTS_AT_LEAST_GCC_VSN__(3, 4, 0)
#define hashmap_clz(x) ((Uint32) __builtin_clz((unsigned int)(x)))
#define hashmap_bitcount(x) ((Uint32) __builtin_popcount((unsigned int) (x)))
#else
Uint32 hashmap_clz(Uint32 x);
Uint32 hashmap_bitcount(Uint32 x);
#endif
/* MAP */
typedef struct flatmap_s {
Eterm thing_word;
Uint size;
Eterm keys; /* tuple */
} flatmap_t;
/* map node
*
* -----------
* Eterm THING
* Uint size
* Eterm Keys -> {K1, K2, K3, ..., Kn} where n = size
* ----
* Eterm V1
* ...
* Eterm Vn, where n = size
* -----------
*/
/* the head-node is a bitmap or array with an untagged size */
#define hashmap_size(x) (((hashmap_head_t*) hashmap_val(x))->size == -1 ? hashmap_subtree_size(x) : ((hashmap_head_t*) hashmap_val(x))->size)
#define hashmap_make_hash(Key) make_internal_hash(Key, 0)
#define hashmap_restore_hash(Heap,Lvl,Key) \
(((Lvl) < 8) ? hashmap_make_hash(Key) >> (4*(Lvl)) : hashmap_make_hash(CONS(Heap, make_small((Lvl)>>3), (Key))) >> (4*((Lvl) & 7)))
#define hashmap_shift_hash(Heap,Hx,Lvl,Key) \
(((++(Lvl)) & 7) ? (Hx) >> 4 : hashmap_make_hash(CONS(Heap, make_small((Lvl)>>3), Key)))
/* erl_term.h stuff */
#define flatmap_get_values(x) (((Eterm *)(x)) + sizeof(flatmap_t)/sizeof(Eterm))
#define flatmap_get_keys(x) (((Eterm *)tuple_val(((flatmap_t *)(x))->keys)) + 1)
#define flatmap_get_size(x) (((flatmap_t*)(x))->size)
#ifdef DEBUG
#define MAP_SMALL_MAP_LIMIT (3)
#else
#define MAP_SMALL_MAP_LIMIT (32)
#endif
struct ErtsWStack_;
struct ErtsEStack_;
Eterm erts_maps_put(Process *p, Eterm key, Eterm value, Eterm map);
int erts_maps_update(Process *p, Eterm key, Eterm value, Eterm map, Eterm *res);
int erts_maps_remove(Process *p, Eterm key, Eterm map, Eterm *res);
int erts_maps_take(Process *p, Eterm key, Eterm map, Eterm *res, Eterm *value);
Eterm erts_hashmap_insert(Process *p, Uint32 hx, Eterm key, Eterm value,
Eterm node, int is_update);
int erts_hashmap_insert_down(Uint32 hx, Eterm key, Eterm node, Uint *sz,
Uint *upsz, struct ErtsEStack_ *sp, int is_update);
Eterm erts_hashmap_insert_up(Eterm *hp, Eterm key, Eterm value,
Uint *upsz, struct ErtsEStack_ *sp);
int erts_validate_and_sort_flatmap(flatmap_t* map);
void hashmap_iterator_init(struct ErtsWStack_* s, Eterm node, int reverse);
Eterm* hashmap_iterator_next(struct ErtsWStack_* s);
Eterm* hashmap_iterator_prev(struct ErtsWStack_* s);
int hashmap_key_hash_cmp(Eterm* ap, Eterm* bp);
Eterm erts_hashmap_from_array(ErtsHeapFactory*, Eterm *leafs, Uint n, int reject_dupkeys);
#define erts_hashmap_from_ks_and_vs(F, KS, VS, N) \
erts_hashmap_from_ks_and_vs_extra((F), (KS), (VS), (N), THE_NON_VALUE, THE_NON_VALUE);
Eterm erts_map_from_ks_and_vs(ErtsHeapFactory *factory, Eterm *ks, Eterm *vs, Uint n);
Eterm erts_hashmap_from_ks_and_vs_extra(ErtsHeapFactory *factory,
Eterm *ks, Eterm *vs, Uint n,
Eterm k, Eterm v);
Uint hashmap_subtree_size(Eterm node);
const Eterm *erts_maps_get(Eterm key, Eterm map);
const Eterm *erts_hashmap_get(Uint32 hx, Eterm key, Eterm map);
/* hamt nodes v2.0
*
* node :: leaf | array | bitmap
* head
*/
typedef struct hashmap_head_s {
Eterm thing_word;
Uint size;
Eterm items[1];
} hashmap_head_t;
/* thing_word tagscheme
* Need two bits for map subtags
*
* Original HEADER representation:
*
* aaaaaaaaaaaaaaaa aaaaaaaaaatttt00 arity:26, tag:4
*
* For maps we have:
*
* vvvvvvvvvvvvvvvv aaaaaaaamm111100 val:16, arity:8, mtype:2
*
* unsure about trailing zeros
*
* map-tag:
* 00 - flat map tag (non-hamt) -> val:16 = #items
* 01 - map-node bitmap tag -> val:16 = bitmap
* 10 - map-head (array-node) -> val:16 = 0xffff
* 11 - map-head (bitmap-node) -> val:16 = bitmap
*/
/* erl_map.h stuff */
#define is_hashmap_header_head(x) ((MAP_HEADER_TYPE(x) & (0x2)))
#define MAKE_MAP_HEADER(Type,Arity,Val) \
(_make_header(((((Uint16)(Val)) << MAP_HEADER_ARITY_SZ) | (Arity)) << MAP_HEADER_TAG_SZ | (Type) , _TAG_HEADER_MAP))
#define MAP_HEADER_FLATMAP \
MAKE_MAP_HEADER(MAP_HEADER_TAG_FLATMAP_HEAD,0x1,0x0)
#define MAP_HEADER_HAMT_HEAD_ARRAY \
MAKE_MAP_HEADER(MAP_HEADER_TAG_HAMT_HEAD_ARRAY,0x1,0xffff)
#define MAP_HEADER_HAMT_HEAD_BITMAP(Bmp) \
MAKE_MAP_HEADER(MAP_HEADER_TAG_HAMT_HEAD_BITMAP,0x1,Bmp)
#define MAP_HEADER_HAMT_NODE_BITMAP(Bmp) \
MAKE_MAP_HEADER(MAP_HEADER_TAG_HAMT_NODE_BITMAP,0x0,Bmp)
#define MAP_HEADER_FLATMAP_SZ (sizeof(flatmap_t) / sizeof(Eterm))
#define HAMT_NODE_ARRAY_SZ (17)
#define HAMT_HEAD_ARRAY_SZ (18)
#define HAMT_NODE_BITMAP_SZ(n) (1 + n)
#define HAMT_HEAD_BITMAP_SZ(n) (2 + n)
/* 2 bits maps tag + 4 bits subtag + 2 ignore bits */
#define _HEADER_MAP_SUBTAG_MASK (0xfc)
/* 1 bit map tag + 1 ignore bit + 4 bits subtag + 2 ignore bits */
#define _HEADER_MAP_HASHMAP_HEAD_MASK (0xbc)
#define HAMT_SUBTAG_NODE_BITMAP ((MAP_HEADER_TAG_HAMT_NODE_BITMAP << _HEADER_ARITY_OFFS) | MAP_SUBTAG)
#define HAMT_SUBTAG_HEAD_ARRAY ((MAP_HEADER_TAG_HAMT_HEAD_ARRAY << _HEADER_ARITY_OFFS) | MAP_SUBTAG)
#define HAMT_SUBTAG_HEAD_BITMAP ((MAP_HEADER_TAG_HAMT_HEAD_BITMAP << _HEADER_ARITY_OFFS) | MAP_SUBTAG)
#define HAMT_SUBTAG_HEAD_FLATMAP ((MAP_HEADER_TAG_FLATMAP_HEAD << _HEADER_ARITY_OFFS) | MAP_SUBTAG)
#define hashmap_index(hash) (((Uint32)hash) & 0xf)
/* hashmap heap size:
[one cons cell + one list term in parent node] per key
[one header + one boxed term in parent node] per inner node
[one header + one size word] for root node
Observed average number of nodes per key is about 0.35.
*/
#define HASHMAP_WORDS_PER_KEY 3
#define HASHMAP_WORDS_PER_NODE 2
#ifdef DEBUG
# define HASHMAP_ESTIMATED_TOT_NODE_SIZE(KEYS) \
(HASHMAP_WORDS_PER_NODE * (KEYS) * 3/10) /* slightly under estimated */
#else
# define HASHMAP_ESTIMATED_TOT_NODE_SIZE(KEYS) \
(HASHMAP_WORDS_PER_NODE * (KEYS) * 4/10) /* slightly over estimated */
#endif
#define HASHMAP_ESTIMATED_HEAP_SIZE(KEYS) \
((KEYS)*HASHMAP_WORDS_PER_KEY + HASHMAP_ESTIMATED_TOT_NODE_SIZE(KEYS))
#endif
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