35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
#!/usr/bin/env python3
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"""Check only PyType_Modified's subclasses declaration and read timing."""
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import re
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from pathlib import Path
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source = Path("cpython/Objects/typeobject.c").read_text()
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match = re.search(
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r"\nvoid\nPyType_Modified\(PyTypeObject \*type\)\n\{(.*?)\n\}",
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source,
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re.S,
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)
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assert match, "PyType_Modified definition missing"
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body = re.sub(r"/\*.*?\*/", "", match.group(1), flags=re.S)
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assert re.match(r"\s*PyObject \*subclasses;", body), (
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"PyType_Modified: PyObject *subclasses; must be declared at function entry"
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)
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assert len(re.findall(r"\bPyObject\s*\*\s*subclasses\b", body)) == 1, (
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"PyType_Modified: declare subclasses exactly once"
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)
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assert re.match(
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r"\s*PyObject \*subclasses;\s*"
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r"(?:Py_ssize_t i;\s*)?"
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r"PyObject \*ref;\s*"
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r"PyObject \*obj;\s*"
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r"if \(!_PyType_HasFeature\(type, Py_TPFLAGS_VALID_VERSION_TAG\)\) \{\s*"
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r"return;\s*\}\s*"
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r"subclasses = type->tp_subclasses;\s*"
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r"if \(subclasses != NULL\) \{",
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body,
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), "PyType_Modified: read tp_subclasses immediately after the early-return guard"
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assert body.count("type->tp_subclasses") == 1, (
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"PyType_Modified: preserve the single tp_subclasses read"
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)
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print("PyType_Modified subclasses C89 declaration and read timing: PASS")
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