New submission from STINNER Victor <[email protected]>:
While reviewing changes of bpo-40077 "Convert static types to
PyType_FromSpec()", I noticed that some static types don't implement
tp_traverse.
The doc says:
Heap-allocated types (...) hold a reference to their type. Their traversal
function must therefore either visit Py_TYPE(self), or delegate this
responsibility by calling tp_traverse of another heap-allocated type (such as a
heap-allocated superclass). If they do not, the type object may not be
garbage-collected.
https://docs.python.org/dev/c-api/typeobj.html#c.PyTypeObject.tp_traverse
Porting to 3.9 says:
for types that have a custom tp_traverse function, ensure that all custom
tp_traverse functions of heap-allocated types visit the object’s type
https://docs.python.org/dev/whatsnew/3.9.html#changes-in-the-c-api
--
It seems like converting a static type to a heap allocated type requires to
*add* a new tp_traverse function, if it wasn't the case.
Maybe we can provide a base tp_traverse implementation in the base object type:
visit the type if it's a heap type?
See attached PR.
See bpo-35810 and bpo-40217 for more information.
----------
components: C API, Interpreter Core
messages: 371884
nosy: pablogsal, vstinner
priority: normal
severity: normal
status: open
title: Visit the type of instance of heap types if tp_traverse is not
implemented
versions: Python 3.10, Python 3.9
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<https://bugs.python.org/issue41036>
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