Function replaceSatelliteDictKeyPtrAndOrDefragDictEntry

src/defrag.cpp:411–425

Utility function that replaces an old key pointer in the dictionary with a * new pointer. Additionally, we try to defrag the dictEntry in that dict. * Oldkey mey be a dead pointer and should not be accessed (we get a * pre-calculated hash value). Newkey may be null if the key pointer wasn't * moved. Return value is the the dictEntry if found, or NULL if not found. * NOTE: this is very ugly co

 * NOTE: this is very ugly code, but it let's us avoid the complication of
 * doing a scan on another dict. */
dictEntry* replaceSatelliteDictKeyPtrAndOrDefragDictEntry(dict *d, sds oldkey, sds newkey, uint64_t hash, long *defragged) {
    dictEntry **deref = dictFindEntryRefByPtrAndHash(d, oldkey, hash);
    if (deref) {
        dictEntry *de = *deref;
        dictEntry *newde = (dictEntry*)activeDefragAlloc(de);
        if (newde) {
            de = *deref = newde;
            (*defragged)++;
        }
        if (newkey)
            de->key = newkey;
        return de;
    }
    return NULL;
}

long activeDefragQuickListNode(quicklist *ql, quicklistNode **node_ref) {
    quicklistNode *newnode, *node = *node_ref;