31 lines
1.3 KiB
Python
31 lines
1.3 KiB
Python
#!/usr/bin/env python3
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"""Check type_new_get_bases base local is C89-compatible and assigned in place."""
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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: base must be in the opening declaration block (C89)"
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assert len(re.findall(r"\bPyTypeObject\s*\*\s*base\b", body)) == 1, (
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"declare base exactly once"
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)
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assert re.search(r"\n\s*base = best_base\(ctx->bases\);", body), (
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"preserve best_base evaluation at its original point"
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)
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assert re.search(
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r"base = best_base\(ctx->bases\);\s*if \(base == NULL\) \{\s*return -1;\s*\}\s*"
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r"ctx->base = base;\s*ctx->bases = Py_NewRef\(ctx->bases\);\s*return 0;",
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body,
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), "preserve best-base validation and subsequent reference updates"
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print("type_new_get_bases base C89 declaration and evaluation ordering: PASS")
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