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#include <stdint.h>
#include <stdlib.h>
#include <assert.h>
#include "misc.h"
#include "mpyconfig.h"
#include "runtime.h"
#include "map.h"
#include "obj.h"
#include "objprivate.h"
// approximatelly doubling primes; made with Mathematica command: Table[Prime[Floor[(1.7)^n]], {n, 3, 24}]
static int doubling_primes[] = {7, 19, 43, 89, 179, 347, 647, 1229, 2297, 4243, 7829, 14347, 26017, 47149, 84947, 152443, 273253, 488399, 869927, 1547173, 2745121, 4861607};
int get_doubling_prime_greater_or_equal_to(int x) {
for (int i = 0; i < sizeof(doubling_primes) / sizeof(int); i++) {
if (doubling_primes[i] >= x) {
return doubling_primes[i];
}
}
// ran out of primes in the table!
// return something sensible, at least make it odd
return x | 1;
}
void py_map_init(py_map_t *map, py_map_kind_t kind, int n) {
map->kind = kind;
map->used = 0;
map->alloc = get_doubling_prime_greater_or_equal_to(n + 1);
map->table = m_new0(py_map_elem_t, map->alloc);
}
py_map_t *py_map_new(py_map_kind_t kind, int n) {
py_map_t *map = m_new(py_map_t, 1);
py_map_init(map, kind, n);
return map;
}
py_map_elem_t* py_map_lookup_helper(py_map_t *map, py_obj_t index, bool add_if_not_found) {
bool is_map_py_obj = (map->kind == MAP_PY_OBJ);
machine_uint_t hash;
if (is_map_py_obj) {
hash = py_obj_hash(index);
} else {
hash = (machine_uint_t)index;
}
uint pos = hash % map->alloc;
for (;;) {
py_map_elem_t *elem = &map->table[pos];
if (elem->key == NULL) {
// not in table
if (add_if_not_found) {
if (map->used + 1 >= map->alloc) {
// not enough room in table, rehash it
int old_alloc = map->alloc;
py_map_elem_t *old_table = map->table;
map->alloc = get_doubling_prime_greater_or_equal_to(map->alloc + 1);
map->used = 0;
map->table = m_new0(py_map_elem_t, map->alloc);
for (int i = 0; i < old_alloc; i++) {
if (old_table[i].key != NULL) {
py_map_lookup_helper(map, old_table[i].key, true)->value = old_table[i].value;
}
}
m_free(old_table);
// restart the search for the new element
pos = hash % map->alloc;
} else {
map->used += 1;
elem->key = index;
return elem;
}
} else {
return NULL;
}
} else if (elem->key == index || (is_map_py_obj && py_obj_equal(elem->key, index))) {
// found it
/* it seems CPython does not replace the index; try x={True:'true'};x[1]='one';x
if (add_if_not_found) {
elem->key = index;
}
*/
return elem;
} else {
// not yet found, keep searching in this table
pos = (pos + 1) % map->alloc;
}
}
}
py_map_elem_t* py_qstr_map_lookup(py_map_t *map, qstr index, bool add_if_not_found) {
py_obj_t o = (py_obj_t)(machine_uint_t)index;
return py_map_lookup_helper(map, o, add_if_not_found);
}
py_map_elem_t* py_map_lookup(py_obj_t o, py_obj_t index, bool add_if_not_found) {
assert(IS_O(o, O_MAP));
return py_map_lookup_helper(&((py_obj_base_t *)o)->u_map, index, add_if_not_found);
}
py_obj_t py_set_lookup(py_obj_t o_in, py_obj_t index, bool add_if_not_found) {
assert(IS_O(o_in, O_SET));
py_obj_base_t *o = o_in;
int hash = py_obj_hash(index);
int pos = hash % o->u_set.alloc;
for (;;) {
py_obj_t elem = o->u_set.table[pos];
if (elem == NULL) {
// not in table
if (add_if_not_found) {
if (o->u_set.used + 1 >= o->u_set.alloc) {
// not enough room in table, rehash it
int old_alloc = o->u_set.alloc;
py_obj_t *old_table = o->u_set.table;
o->u_set.alloc = get_doubling_prime_greater_or_equal_to(o->u_set.alloc + 1);
o->u_set.used = 0;
o->u_set.table = m_new(py_obj_t, o->u_set.alloc);
for (int i = 0; i < old_alloc; i++) {
if (old_table[i] != NULL) {
py_set_lookup(o, old_table[i], true);
}
}
m_free(old_table);
// restart the search for the new element
pos = hash % o->u_set.alloc;
} else {
o->u_set.used += 1;
o->u_set.table[pos] = index;
return index;
}
} else {
return NULL;
}
} else if (py_obj_equal(elem, index)) {
// found it
return elem;
} else {
// not yet found, keep searching in this table
pos = (pos + 1) % o->u_set.alloc;
}
}
}
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