8000 gh-104252: Immortalize Py_EMPTY_KEYS by ericsnowcurrently · Pull Request #104253 · python/cpython · GitHub
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gh-104252: Immortalize Py_EMPTY_KEYS #104253

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Merged
merged 10 commits into from
May 10, 2023
Merged

gh-104252: Immortalize Py_EMPTY_KEYS #104253

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5bc2469
Factor out _dict_state_INIT.
ericsnowcurrently May 6, 2023
e472d94
Immortalize Py_EMPTY_KEYS.
ericsnowcurrently May 6, 2023
87351e0
Handle other uses of dk_refcnt.
ericsnowcurrently May 8, 2023
f5da088
Add a note.
ericsnowcurrently May 8, 2023
db8612f
Drop an old line.
ericsnowcurrently May 8, 2023
58585a9
Drop an unnecessary condition.
ericsnowcurrently May 8, 2023
6b5c952
Drop an unnecessary assert.
ericsnowcurrently May 9, 2023
bdbce5f
Do not bother inc/dec-refing Py_EMPTY_KEYS.
ericsnowcurrently May 9, 2023
aab493a
Do not update Py_Reftotal for Py_EMPTY_KEYS.
ericsnowcurrently May 9, 2023
5aabfd7
Clarify the comment about dictkeys_incref() and dictkeys_decref().
ericsnowcurrently May 9, 2023
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Clarify the comment about dictkeys_incref() and dictkeys_decref().
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@ericsnowcurrently
ericsnowcurrently committed May 9, 2023
commit 5aabfd77b1bba5de8b5ff1a5fbac9a6e32e82dd6
11 changes: 6 additions & 5 deletions Objects/dictobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -300,11 +300,12 @@ _PyDict_DebugMallocStats(FILE *out)

static void free_keys_object(PyInterpreterState *interp, PyDictKeysObject *keys);

/* We might consider modifying PyDictKeysObject so we could use
Py_INCREF() instead of dictkeys_incref() (and likewise with
Py_DECREF() and dictkeys_decref()). However, there doesn't
seem to be enough benefit (performance or otherwise) to justify
the change. */
/* PyDictKeysObject has refcounts like PyObject does, so we have the
following two functions to mirror what Py_INCREF() and Py_DECREF() do.
(Keep in mind that PyDictKeysObject isn't actually a PyObject.)
Likewise a PyDictKeysObject can be immortal (e.g. Py_EMPTY_KEYS),
so we apply a naive version of what Py_INCREF() and Py_DECREF() do
for immortal objects. */

static inline void
dictkeys_incref(PyDictKeysObject *dk)
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