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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#ifndef __ERL_HASH_H__
#define __ERL_HASH_H__
#include "sys.h"
#include "erl_term.h"
Eterm erts_hashmap_get(Eterm key, Eterm map);
struct ErtsWStack_;
void hashmap_iterator_init(struct ErtsWStack_* s, Eterm node);
Eterm* hashmap_iterator_next(struct ErtsWStack_* s);
int hashmap_key_hash_cmp(Eterm* ap, Eterm* bp);
Eterm erts_hashmap_from_array(Process *p, Eterm *leafs, Uint n);
/* HASH */
#if defined(__GNUC__)
#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
/* hamt nodes v2.0
*
* node :: leaf | array | bitmap
* head
*/
/* the head-node is a bitmap or array with an untagged size */
typedef struct hashmap_head_s {
Eterm thing_word;
Uint size;
Eterm items[1];
} hashmap_head_t;
#define hashmap_size(x) (((hashmap_head_t*) hashmap_val(x))->size)
#define hashmap_size_rel(RTERM, BASE) hashmap_size(rterm2wterm(RTERM, BASE))
/* 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_HASHMAP))
#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_ARRAY \
make_arityval(16)
#define MAP_HEADER_HAMT_NODE_BITMAP(Bmp) \
MAKE_MAP_HEADER(MAP_HEADER_TAG_HAMT_NODE_BITMAP,0x0,Bmp)
#define HAMT_HEAD_EMPTY_SZ (2)
#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)
#define _HEADER_MAP_SUBTAG_MASK (0xfc) /* 2 bits maps tag + 4 bits subtag + 2 ignore bits */
/* SUBTAG_NODE_ARRAY is in fact a tuple with 16 elements */
#define HAMT_SUBTAG_NODE_ARRAY (((16 << _HEADER_ARITY_OFFS) | ARITYVAL_SUBTAG) & _HEADER_MAP_SUBTAG_MASK)
#define HAMT_SUBTAG_NODE_BITMAP ((MAP_HEADER_TAG_HAMT_NODE_BITMAP << _HEADER_ARITY_OFFS) | HASHMAP_SUBTAG)
#define HAMT_SUBTAG_HEAD_ARRAY ((MAP_HEADER_TAG_HAMT_HEAD_ARRAY << _HEADER_ARITY_OFFS) | HASHMAP_SUBTAG)
#define HAMT_SUBTAG_HEAD_BITMAP ((MAP_HEADER_TAG_HAMT_HEAD_BITMAP << _HEADER_ARITY_OFFS) | HASHMAP_SUBTAG)
#define hashmap_index(hash) (((Uint32)hash) & 0xf)
#endif
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