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 +1,38 @@
+#!/usr/bin/env python3
+"""Check structseq_dealloc's C89 declarations and teardown 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"static void\nstructseq_dealloc\(PyStructSequence \*obj\)\n\{(.*?)\n\}",
+    source.read_text(),
+    re.S,
+)
+assert match, "structseq_dealloc definition not found"
+body = match.group(1)
+assert re.match(r"\s*Py_ssize_t i, size;\s*PyTypeObject \*tp;", body), (
+    "structseq_dealloc: tp must be declared without initializer alongside i and "
+    "size before GC untracking; declaration after statement is not C89 compatible"
+)
+expected = """
+    Py_ssize_t i, size;
+    PyTypeObject *tp;
+    PyObject_GC_UnTrack(obj);
+
+    tp = Py_TYPE(obj);
+    size = REAL_SIZE(obj);
+    for (i = 0; i < size; ++i) {
+        Py_XDECREF(obj->ob_item[i]);
+    }
+    PyObject_GC_Del(obj);
+    if (_PyType_HasFeature(tp, Py_TPFLAGS_HEAPTYPE)) {
+        Py_DECREF(tp);
+    }
+"""
+assert re.sub(r"\s+", "", body) == re.sub(r"\s+", "", expected), (
+    "preserve GC untracking before type capture and size lookup, item decref "
+    "order, GC deletion, and conditional heap-type decref"
+)
+print("structseq_dealloc C89 declarations and teardown order: PASS")