47 lines
1.9 KiB
Python
47 lines
1.9 KiB
Python
#!/usr/bin/env python3
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"""Check PyType_Modified's ref/obj declarations and unchanged use order."""
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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(
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r"\s*PyObject \*subclasses;\s*Py_ssize_t i;\s*PyObject \*ref;",
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body,
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), "PyType_Modified: PyObject *ref; must be in the opening declaration block"
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assert len(re.findall(r"\bPyObject\s*\*\s*ref\b", body)) == 1, (
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"PyType_Modified: declare ref exactly once without initialization"
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)
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assert re.match(
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r"\s*PyObject \*subclasses;\s*Py_ssize_t i;\s*PyObject \*ref;\s*"
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r"PyObject \*obj;",
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body,
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), "PyType_Modified: PyObject *obj; must be in the opening declaration block"
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assert len(re.findall(r"\bPyObject\s*\*\s*obj\b", body)) == 1, (
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"PyType_Modified: declare obj exactly once without initialization"
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)
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assert re.fullmatch(
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r"\s*PyObject \*subclasses;\s*Py_ssize_t i;\s*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 \(subclasses != NULL\) \{\s*"
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r"assert\(PyDict_CheckExact\(subclasses\)\);\s*i = 0;\s*"
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r"while \(PyDict_Next\(subclasses, &i, NULL, &ref\)\) \{\s*"
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r"assert\(PyWeakref_CheckRef\(ref\)\);\s*"
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r"obj = PyWeakref_GET_OBJECT\(ref\);\s*"
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r"if \(obj == Py_None\) \{\s*continue;\s*\}\s*"
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r"PyType_Modified\(_PyType_CAST\(obj\)\);\s*\}\s*\}\s*"
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r"type->tp_flags &= ~Py_TPFLAGS_VALID_VERSION_TAG;\s*"
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r"type->tp_version_tag = 0;\s*",
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body,
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), "PyType_Modified: preserve all assignments, uses and evaluation order"
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print("PyType_Modified ref/obj C89 declarations and unchanged use order: PASS")
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