33 lines
1.3 KiB
Python
33 lines
1.3 KiB
Python
#!/usr/bin/env python3
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"""Check only maybe_freelist_push's index declaration and evaluation order."""
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import re
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import sys
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from pathlib import Path
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source = Path(sys.argv[1] if len(sys.argv) > 1 else "cpython/Objects/tupleobject.c")
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match = re.search(
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r"static inline int\nmaybe_freelist_push\(PyTupleObject \*op\)\n\{(.*?)\n\}",
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source.read_text(),
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re.S,
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)
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assert match, "maybe_freelist_push definition missing"
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body = match.group(1)
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assert re.match(
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r"\s*#if PyTuple_NFREELISTS > 0\s*"
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r"PyInterpreterState \*interp = _PyInterpreterState_GET\(\);\s*"
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r"Py_ssize_t index;\s*#ifdef Py_DEBUG",
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body,
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), "maybe_freelist_push: index must be declared before the debug assertion and empty-tuple check"
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assert len(re.findall(r"\bPy_ssize_t\s+index\b", body)) == 1, (
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"maybe_freelist_push: exactly one index declaration required"
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)
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assert re.search(
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r"if \(Py_SIZE\(op\) == 0\)\s*\{\s*return 0;\s*\}\s*"
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r"index = Py_SIZE\(op\) - 1;\s*if \(index < PyTuple_NFREELISTS",
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body,
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), "maybe_freelist_push: assign index at its original evaluation point after the empty-tuple return"
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assert len(re.findall(r"\bindex\s*=", body)) == 1, (
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"maybe_freelist_push: exactly one index assignment required"
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)
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print("maybe_freelist_push index C89 declaration and evaluation order: PASS")
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