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 +1,49 @@
+#!/usr/bin/env python3
+"""Check _PyTuple_FromArray's C89 declarations and preserve its 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 \*\n_PyTuple_FromArray\(PyObject \*const \*src, Py_ssize_t n\)\n\{(.*?)\n\}",
+    source.read_text(),
+    re.S,
+)
+assert match, "_PyTuple_FromArray definition not found"
+body = match.group(1)
+assert re.match(
+    r"\s*PyTupleObject \*tuple;\s*PyObject \*\*dst;\s*Py_ssize_t i;"
+    r"\s*if \(n == 0\)", body
+), (
+    "_PyTuple_FromArray: tuple, dst and i must be declared without initializers "
+    "before the empty-tuple check; a loop declaration is not C89 compatible"
+)
+expected = """
+    PyTupleObject *tuple;
+    PyObject **dst;
+    Py_ssize_t i;
+    if (n == 0) {
+        return tuple_get_empty();
+    }
+
+    tuple = tuple_alloc(n);
+    if (tuple == NULL) {
+        return NULL;
+    }
+    dst = tuple->ob_item;
+    for (i = 0; i < n; i++) {
+        PyObject *item = src[i];
+        Py_INCREF(item);
+        dst[i] = item;
+    }
+    _PyObject_GC_TRACK(tuple);
+    return (PyObject *)tuple;
+"""
+assert re.sub(r"\s+", "", body) == re.sub(r"\s+", "", expected), (
+    "preserve early empty return before single allocation, NULL handling, "
+    "dst assignment immediately after NULL check, i initialization/condition/increment, "
+    "unchanged item declaration, "
+    "INCREF/store, GC tracking and return order"
+)
+print("_PyTuple_FromArray C89 declarations and evaluation/refcount/error order: PASS")