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Issue #24483: C implementation of functools.lru_cache() now calculates key's

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hash only once.
This commit is contained in:
Serhiy Storchaka 2015-10-02 12:47:11 +03:00
parent c9fda9b903
commit b9d98d532c
4 changed files with 64 additions and 6 deletions
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37
Objects/dictobject.c
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@ -1242,6 +1242,7 @@ _PyDict_SetItem_KnownHash(PyObject *op, PyObject *key, PyObject *value,
}
assert(key);
assert(value);
assert(hash != -1);
mp = (PyDictObject *)op;
/* insertdict() handles any resizing that might be necessary */
@ -1290,6 +1291,42 @@ PyDict_DelItem(PyObject *op, PyObject *key)
return 0;
}
int
_PyDict_DelItem_KnownHash(PyObject *op, PyObject *key, Py_hash_t hash)
{
PyDictObject *mp;
PyDictKeyEntry *ep;
PyObject *old_key, *old_value;
PyObject **value_addr;
if (!PyDict_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
assert(key);
assert(hash != -1);
mp = (PyDictObject *)op;
ep = (mp->ma_keys->dk_lookup)(mp, key, hash, &value_addr);
if (ep == NULL)
return -1;
if (*value_addr == NULL) {
_PyErr_SetKeyError(key);
return -1;
}
old_value = *value_addr;
*value_addr = NULL;
mp->ma_used--;
if (!_PyDict_HasSplitTable(mp)) {
ENSURE_ALLOWS_DELETIONS(mp);
old_key = ep->me_key;
Py_INCREF(dummy);
ep->me_key = dummy;
Py_DECREF(old_key);
}
Py_DECREF(old_value);
return 0;
}
void
PyDict_Clear(PyObject *op)
{