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gh-121459: Add missing return to _PyDict_LoadGlobalStackRef #124085

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Merged
colesbury merged 1 commit into from
Sep 14, 2024
Merged

gh-121459: Add missing return to _PyDict_LoadGlobalStackRef #124085

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9 changes: 7 additions & 2 deletions 9 Objects/dictobject.c
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@colesbury colesbury Oct 21, 2024

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@fiona02 - Please do not post AI-generated PR reviews.

Original file line number Diff line number Diff line change
Expand Up @@ -1550,7 +1550,12 @@ _Py_dict_lookup_threadsafe_stackref(PyDictObject *mp, PyObject *key, Py_hash_t h
{
PyObject *val;
Py_ssize_t ix = _Py_dict_lookup(mp, key, hash, &val);
*value_addr = val == NULL ? PyStackRef_NULL : PyStackRef_FromPyObjectNew(val);
if (val == NULL) {
*value_addr = PyStackRef_NULL;
}
else {
*value_addr = PyStackRef_FromPyObjectNew(val);
}
Comment on lines +1553 to +1558

@colesbury colesbury Sep 14, 2024

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So... I think MSVC 1916 (Visual Studio 2017) on the Windows 10 buildbot is just really buggy and miscompiles the ternary if...

@colesbury colesbury Sep 14, 2024

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Ugh, MSVC miscompiles this up through v19.27 (fixed in v19.28):

https://gcc.godbolt.org/z/ezr9rsvM4

return ix;
}

Expand Down Expand Up @@ -2483,7 +2488,7 @@ _PyDict_LoadGlobalStackRef(PyDictObject *globals, PyDictObject *builtins, PyObje
/* namespace 1: globals */
ix = _Py_dict_lookup_threadsafe_stackref(globals, key, hash, res);
if (ix == DKIX_ERROR) {
*res = PyStackRef_NULL;
return;
}
if (ix != DKIX_EMPTY && !PyStackRef_IsNull(*res)) {
return;
Expand Down
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