46 lines
1.4 KiB
Python
46 lines
1.4 KiB
Python
#!/usr/bin/env python3
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"""Check only mro_hierarchy's new_mro declaration and guarded 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"\nstatic int\nmro_hierarchy\(PyTypeObject \*type, PyObject \*temp\)\n\{(.*?)\n\}",
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source,
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re.S,
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)
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assert match, "mro_hierarchy 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 \*old_mro;\s*PyObject \*new_mro;", body), (
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"mro_hierarchy: PyObject *new_mro; must be in the opening declarations"
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)
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assert len(re.findall(r"\bPyObject\s*\*\s*new_mro\b", body)) == 1, (
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"mro_hierarchy: declare new_mro exactly once without initialization"
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)
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expected_prefix = """
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PyObject *old_mro;
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PyObject *new_mro;
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PyObject *tuple;
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Py_ssize_t n;
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Py_ssize_t i;
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int res = mro_internal(type, &old_mro);
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if (res <= 0) {
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return res;
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}
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new_mro = type->tp_mro;
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if (old_mro != NULL) {
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tuple = PyTuple_Pack(3, type, new_mro, old_mro);
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}
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else {
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tuple = PyTuple_Pack(2, type, new_mro);
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}
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"""
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assert body.split()[:len(expected_prefix.split())] == expected_prefix.split(), (
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"mro_hierarchy: preserve the guard, new_mro read timing, and tuple branches"
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)
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assert len(re.findall(r"\bnew_mro\s*=", body)) == 1, (
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"mro_hierarchy: assign new_mro exactly once"
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)
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print("mro_hierarchy new_mro C89 declaration and guarded read timing: PASS")
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