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GH-125868: Fix STORE_ATTR_WITH_HINT specialization (GH-125876)

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Mark Shannon 2024-10-24 11:57:02 +01:00 • committed by GitHub
parent c35b33bfb7
commit b61fece852
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6 changed files with 62 additions and 13 deletions
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7
Python/bytecodes.c
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@ -2303,17 +2303,16 @@ dummy_func(
assert(PyDict_CheckExact((PyObject *)dict));
PyObject *name = GETITEM(FRAME_CO_NAMES, oparg);
DEOPT_IF(hint >= (size_t)dict->ma_keys->dk_nentries);
PyObject *old_value;
DEOPT_IF(!DK_IS_UNICODE(dict->ma_keys));
PyDictUnicodeEntry *ep = DK_UNICODE_ENTRIES(dict->ma_keys) + hint;
DEOPT_IF(ep->me_key != name);
PyObject *old_value = ep->me_value;
DEOPT_IF(old_value == NULL);
/* Ensure dict is GC tracked if it needs to be */
if (!_PyObject_GC_IS_TRACKED(dict) && _PyObject_GC_MAY_BE_TRACKED(PyStackRef_AsPyObjectBorrow(value))) {
_PyObject_GC_TRACK(dict);
}
old_value = ep->me_value;
PyDict_WatchEvent event = old_value == NULL ? PyDict_EVENT_ADDED : PyDict_EVENT_MODIFIED;
_PyDict_NotifyEvent(tstate->interp, event, dict, name, PyStackRef_AsPyObjectBorrow(value));
_PyDict_NotifyEvent(tstate->interp, PyDict_EVENT_MODIFIED, dict, name, PyStackRef_AsPyObjectBorrow(value));
ep->me_value = PyStackRef_AsPyObjectSteal(value);
// old_value should be DECREFed after GC track checking is done, if not, it could raise a segmentation fault,
// when dict only holds the strong reference to value in ep->me_value.