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gh-106168: Revert the "size before item" setting (#111683)

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gh-106168: Update the size only after setting the item, to avoid temporary inconsistencies.
Also remove the "what's new" sentence regarding the size setting since tuples cannot grow after allocation.
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scoder 2023-11-03 12:02:39 +01:00 committed by GitHub
parent d49aba5a7a
commit 24ddaee5ca
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3 changed files with 2 additions and 4 deletions
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2
Doc/whatsnew/3.13.rst
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@ -1049,8 +1049,6 @@ New Features
* If Python is built in :ref:`debug mode <debug-build>` or :option:`with
assertions <--with-assertions>`, :c:func:`PyTuple_SET_ITEM` and
:c:func:`PyList_SET_ITEM` now check the index argument with an assertion.
If the assertion fails in :c:func:`PyTuple_SET_ITEM`, make sure that the
tuple size is set before.
(Contributed by Victor Stinner in :gh:`106168`.)
* Add :c:func:`PyModule_Add` function: similar to

2
Include/internal/pycore_list.h
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@ -51,8 +51,8 @@ _PyList_AppendTakeRef(PyListObject *self, PyObject *newitem)
Py_ssize_t allocated = self->allocated;
assert((size_t)len + 1 < PY_SSIZE_T_MAX);
if (allocated > len) {
Py_SET_SIZE(self, len + 1);
PyList_SET_ITEM(self, len, newitem);
Py_SET_SIZE(self, len + 1);
return 0;
}
return _PyList_AppendTakeRefListResize(self, newitem);

2
Objects/listobject.c
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@ -956,8 +956,8 @@ list_extend(PyListObject *self, PyObject *iterable)
if (Py_SIZE(self) < self->allocated) {
/* steals ref */
Py_ssize_t len = Py_SIZE(self);
Py_SET_SIZE(self, len + 1);
PyList_SET_ITEM(self, len, item);
Py_SET_SIZE(self, len + 1);
}
else {
if (_PyList_AppendTakeRef(self, item) < 0)