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[3.12] gh-122208: Don't delivery PyDict_EVENT_ADDED until it can't fail #122327

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Merged
merged 2 commits into from
Jul 30, 2024
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[3.12] gh-122208: Don't delivery PyDict_EVENT_ADDED until it can't fail #122327

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aefbe1e
Don't delivery PyDict_EVENT_ADDED until it can't fail
DinoV Jul 26, 2024
edd939e
📜🤖 Added by blurb_it.
blurb-it[bot] Jul 26, 2024
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2024-07-26-21-38-47.gh-issue-122208.z8KHsY.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Dictionary watchers now only deliver the PyDict_EVENT_ADDED event when the insertion is in a known good state to succeed.
21 changes: 11 additions & 10 deletions Objects/dictobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1251,17 +1251,18 @@ insertdict(PyInterpreterState *interp, PyDictObject *mp,
MAINTAIN_TRACKING(mp, key, value);

if (ix == DKIX_EMPTY) {
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, value);
/* Insert into new slot. */
mp->ma_keys->dk_version = 0;
assert(old_value == NULL);
if (mp->ma_keys->dk_usable <= 0) {
/* Need to resize. */
if (insertion_resize(interp, mp, 1) < 0)
goto Fail;
}

uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, value);
/* Insert into new slot. */
mp->ma_keys->dk_version = 0;

Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash);
dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries);

Expand Down Expand Up @@ -1335,9 +1336,6 @@ insert_to_emptydict(PyInterpreterState *interp, PyDictObject *mp,
{
assert(mp->ma_keys == Py_EMPTY_KEYS);

uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, value);

int unicode = PyUnicode_CheckExact(key);
PyDictKeysObject *newkeys = new_keys_object(
interp, PyDict_LOG_MINSIZE, unicode);
Expand All @@ -1346,6 +1344,9 @@ insert_to_emptydict(PyInterpreterState *interp, PyDictObject *mp,
Py_DECREF(value);
return -1;
}
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, value);

/* We don't decref Py_EMPTY_KEYS here because it is immortal. */
mp->ma_keys = newkeys;
mp->ma_values = NULL;
Expand Down Expand Up @@ -3324,15 +3325,15 @@ PyDict_SetDefault(PyObject *d, PyObject *key, PyObject *defaultobj)
return NULL;

if (ix == DKIX_EMPTY) {
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, defaultobj);
mp->ma_keys->dk_version = 0;
value = defaultobj;
if (mp->ma_keys->dk_usable <= 0) {
if (insertion_resize(interp, mp, 1) < 0) {
return NULL;
}
}
uint64_t new_version = _PyDict_NotifyEvent(
interp, PyDict_EVENT_ADDED, mp, key, defaultobj);
mp->ma_keys->dk_version = 0;
Py_ssize_t hashpos = find_empty_slot(mp->ma_keys, hash);
dictkeys_set_index(mp->ma_keys, hashpos, mp->ma_keys->dk_nentries);
if (DK_IS_UNICODE(mp->ma_keys)) {
Expand Down