29 lines
1.2 KiB
Python
29 lines
1.2 KiB
Python
#!/usr/bin/env python3
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"""Regress VC6 C89 compatibility of type_new_get_bases() loop index."""
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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\ntype_new_get_bases\(type_new_ctx \*ctx, PyObject \*\*type\)\n\{(.*?)\n\}",
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source, re.S,
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)
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assert match, "type_new_get_bases definition missing"
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body = re.sub(r"/\*.*?\*/|//[^\n]*", "", match.group(1), flags=re.S)
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assert re.match(
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r"\s*Py_ssize_t nbases = PyTuple_GET_SIZE\(ctx->bases\);"
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r"\s*Py_ssize_t i;\s*PyTypeObject \*winner;\s*PyTypeObject \*base;"
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r"\s*if \(nbases == 0\)",
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body,
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), "type_new_get_bases: C89 loop index i must be declared before statements"
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assert len(re.findall(r"\bPy_ssize_t\s+i\b", body)) == 1, "declare i exactly once"
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assert re.search(
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r"for \(i = 0; i < nbases; i\+\+\) \{\s*"
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r"PyObject \*base = PyTuple_GET_ITEM\(ctx->bases, i\);",
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body,
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), "type_new_get_bases: preserve loop start, bound, increment, and base lookup"
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assert not re.search(r"for\s*\(\s*Py_ssize_t\b", body), (
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"type_new_get_bases: loop initializer must reuse the declared index"
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)
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print("type_new_get_bases C89 loop index: PASS")
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