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gh-81057: Move the Extension Modules Cache to _PyRuntimeState (gh-99355)

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We also move the closely related max_module_number and add comments documenting the group of struct members.

https://github.com/python/cpython/issues/81057
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Eric Snow 2022-11-11 14:16:28 -07:00 • committed by GitHub
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7 changed files with 104 additions and 33 deletions
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19
Include/internal/pycore_interp.h
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@ -123,6 +123,25 @@ struct _is {
// sys.modules dictionary
PyObject *modules;
/* This is the list of module objects for all legacy (single-phase init)
extension modules ever loaded in this process (i.e. imported
in this interpreter or in any other). Py_None stands in for
modules that haven't actually been imported in this interpreter.
A module's index (PyModuleDef.m_base.m_index) is used to look up
the corresponding module object for this interpreter, if any.
(See PyState_FindModule().) When any extension module
is initialized during import, its moduledef gets initialized by
PyModuleDef_Init(), and the first time that happens for each
PyModuleDef, its index gets set to the current value of
a global counter (see _PyRuntimeState.imports.last_module_index).
The entry for that index in this interpreter remains unset until
the module is actually imported here. (Py_None is used as
a placeholder.) Note that multi-phase init modules always get
an index for which there will never be a module set.
This is initialized lazily in _PyState_AddModule(), which is also
where modules get added. */
PyObject *modules_by_index;
// Dictionary of the sys module
PyObject *sysdict;