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bpo-32374: m_traverse may be called with m_state=NULL (GH-5140)

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Multi-phase initialized modules allow m_traverse to be called while the
module is still being initialized, so module authors may need to account
for that.
(cherry picked from commit c2b0b12d1a)

Co-authored-by: Marcel Plch <gmarcel.plch@gmail.com>
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Miss Islington (bot) 2018-03-16 23:03:56 -07:00 • committed by GitHub
parent 6e65e44626
commit 136905fffd
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5 changed files with 96 additions and 7 deletions
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Doc/c-api/module.rst
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@ -196,17 +196,23 @@ or request "multi-phase initialization" by returning the definition struct itsel
.. c:member:: traverseproc m_traverse
A traversal function to call during GC traversal of the module object, or
*NULL* if not needed.
*NULL* if not needed. This function may be called before module state
is allocated (:c:func:`PyModule_GetState()` may return `NULL`),
and before the :c:member:`Py_mod_exec` function is executed.
.. c:member:: inquiry m_clear
A clear function to call during GC clearing of the module object, or
*NULL* if not needed.
*NULL* if not needed. This function may be called before module state
is allocated (:c:func:`PyModule_GetState()` may return `NULL`),
and before the :c:member:`Py_mod_exec` function is executed.
.. c:member:: freefunc m_free
A function to call during deallocation of the module object, or *NULL* if
not needed.
not needed. This function may be called before module state
is allocated (:c:func:`PyModule_GetState()` may return `NULL`),
and before the :c:member:`Py_mod_exec` function is executed.
Single-phase initialization
...........................