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 +1,54 @@
+#!/usr/bin/env python3
+"""Check PyTuple_Pack's C89 declaration and evaluation/refcount/error order."""
+import re
+import sys
+from pathlib import Path
+
+source = Path(sys.argv[1] if len(sys.argv) > 1 else "cpython/Objects/tupleobject.c")
+match = re.search(
+    r"PyObject \*\nPyTuple_Pack\(Py_ssize_t n, \.\.\.\)\n\{(.*?)\n\}",
+    source.read_text(),
+    re.S,
+)
+assert match, "PyTuple_Pack definition not found"
+body = match.group(1)
+assert re.match(
+    r"\s*Py_ssize_t i;\s*PyObject \*o;\s*PyObject \*\*items;"
+    r"\s*va_list vargs;\s*PyTupleObject \*result;", body
+), (
+    "PyTuple_Pack: result must be declared without initializer before the empty "
+    "tuple check; declaration after statement is not C89 compatible"
+)
+expected = """
+    Py_ssize_t i;
+    PyObject *o;
+    PyObject **items;
+    va_list vargs;
+    PyTupleObject *result;
+
+    if (n == 0) {
+        return tuple_get_empty();
+    }
+
+    va_start(vargs, n);
+    result = tuple_alloc(n);
+    if (result == NULL) {
+        va_end(vargs);
+        return NULL;
+    }
+    items = result->ob_item;
+    for (i = 0; i < n; i++) {
+        o = va_arg(vargs, PyObject *);
+        Py_INCREF(o);
+        items[i] = o;
+    }
+    va_end(vargs);
+    _PyObject_GC_TRACK(result);
+    return (PyObject *)result;
+"""
+assert re.sub(r"\s+", "", body) == re.sub(r"\s+", "", expected), (
+    "preserve empty-tuple return, va_start before single allocation, failure "
+    "va_end/NULL return, item extraction/INCREF/store, final va_end, GC tracking, "
+    "and return order"
+)
+print("PyTuple_Pack C89 declaration and evaluation/refcount/error order: PASS")