bpo-41194: The _ast module cannot be loaded more than once #21290
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Fix a crash in the _ast module: it can no longer be loaded more than once. It now uses a global state rather than a module state. * Move _ast module state: use a global state instead. * Set _astmodule.m_size to -1, so the extension cannot be loaded more than once.
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I wrote this change to be able to backport it to Python 3.9, since Python 3.9 is also affected by https://bugs.python.org/issue41194 I don't think that this change goes against https://bugs.python.org/issue38113 intent "Update the Python-ast.c generator to PEP 384". |
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I will propose a following PR to add again a module state to the _ast module. But for Python 3.9, I prefer to keep a global state, since I'm not 100% confident in such intrusive change, knowing that we are past Python 3.9 feature freeze. |
vstinner
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Jul 3, 2020
…21290) (GH-21292) * bpo-41194: Pass module state in Python-ast.c (GH-21284) Rework asdl_c.py to pass the module state to functions in Python-ast.c, instead of using astmodulestate_global. Handle also PyState_AddModule() failure in init_types(). (cherry picked from commit 74419f0) * bpo-41194: The _ast module cannot be loaded more than once (GH-21290) Fix a crash in the _ast module: it can no longer be loaded more than once. It now uses a global state rather than a module state. * Move _ast module state: use a global state instead. * Set _astmodule.m_size to -1, so the extension cannot be loaded more than once. (cherry picked from commit 91e1bc1)
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Fix a crash in the _ast module: it can no longer be loaded more than
once. It now uses a global state rather than a module state.
than once.
https://bugs.python.org/issue41194