port: advance VC6 typeobject frontier and preserve regression coverage

2026-10-26 18:09:33 +00:00
parent 35caf1a558
commit 5ab291a68c
162 changed files with 15675 additions and 85 deletions
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+"""Check PyStructSequence_New's C89 declaration and size lookup order."""
+import re
+import sys
+from pathlib import Path
+
+source = Path(sys.argv[1] if len(sys.argv) > 1 else "cpython/Objects/structseq.c")
+match = re.search(
+    r"PyStructSequence_New\(PyTypeObject \*type\)\s*\{(.*?)\n\}",
+    source.read_text(),
+    re.S,
+)
+assert match, "PyStructSequence_New definition not found"
+body = match.group(1)
+assert re.match(
+    r"\s*PyStructSequence \*obj;"
+    r"\s*Py_ssize_t size = REAL_SIZE_TP\(type\), i;"
+    r"\s*Py_ssize_t vsize;",
+    body,
+), "vsize must be declared without initializer before the size < 0 check"
+assert re.match(
+    r"\s*PyStructSequence \*obj;"
+    r"\s*Py_ssize_t size = REAL_SIZE_TP\(type\), i;"
+    r"\s*Py_ssize_t vsize;"
+    r"\s*if \(size < 0\) \{\s*return NULL;\s*\}"
+    r"\s*vsize = VISIBLE_SIZE_TP\(type\);"
+    r"\s*if \(vsize < 0\) \{\s*return NULL;\s*\}"
+    r"\s*obj = PyObject_GC_NewVar\(PyStructSequence, type, size\);",
+    body,
+), "preserve size early return, visible-size lookup, and allocation order"
+assert body.count("VISIBLE_SIZE_TP(type)") == 1, "visible size must be read exactly once"
+assert body.count("Py_ssize_t vsize;") == 1, "vsize must be declared exactly once"
+print("PyStructSequence_New C89 declaration and size lookup order: PASS")