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use marcos to control load factor

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方而静 2024-06-14 11:08:34 +08:00
parent 21fdaeaa21
commit 9390b0d638
1 changed files with 5 additions and 3 deletions
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8
src/objects/dict.c
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@ -4,6 +4,8 @@
#include <assert.h> #include <assert.h>
#include <string.h> #include <string.h>
#define DICT_MAX_LOAD 0.75
struct pkpy_DictEntry { struct pkpy_DictEntry {
pkpy_Var key; pkpy_Var key;
pkpy_Var val; pkpy_Var val;
@ -124,7 +126,7 @@ bool pkpy_Dict__set(pkpy_Dict* self, void* vm, pkpy_Var key, pkpy_Var val) {
h = pkpy_Dict__probe0(self, vm, key, hash); h = pkpy_Dict__probe0(self, vm, key, hash);
pkpy_Dict__htset(self, h, idx); pkpy_Dict__htset(self, h, idx);
self->count += 1; self->count += 1;
if(self->count >= self->_htcap * 0.75) pkpy_Dict__extendht(self, vm); if(self->count >= self->_htcap * DICT_MAX_LOAD) pkpy_Dict__extendht(self, vm);
return true; return true;
} }
@ -157,11 +159,11 @@ bool pkpy_Dict__contains(const pkpy_Dict* self, void* vm, pkpy_Var key) {
static bool pkpy_Dict__refactor(pkpy_Dict* self, void* vm) { static bool pkpy_Dict__refactor(pkpy_Dict* self, void* vm) {
int deleted_slots = self->_entries.count - self->count; int deleted_slots = self->_entries.count - self->count;
if(deleted_slots <= 8 || deleted_slots < self->_entries.count * 0.25) return false; if(deleted_slots <= 8 || deleted_slots < self->_entries.count * (1 - DICT_MAX_LOAD)) return false;
// shrink // shrink
free(self->_hashtable); free(self->_hashtable);
while(self->_htcap * 0.375 > self->count && self->_htcap >= 32) while(self->_htcap * DICT_MAX_LOAD / 2 > self->count && self->_htcap >= 32)
self->_htcap /= 2; self->_htcap /= 2;
self->_hashtable = malloc(pkpy_Dict__ht_byte_size(self)); self->_hashtable = malloc(pkpy_Dict__ht_byte_size(self));
memset(self->_hashtable, 0xff, pkpy_Dict__ht_byte_size(self)); memset(self->_hashtable, 0xff, pkpy_Dict__ht_byte_size(self));