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 +1,60 @@
+#!/usr/bin/env python3
+"""Guard slice_richcompare C89 locals and allocation/refcount order."""
+import re
+import sys
+from pathlib import Path
+
+source = Path(sys.argv[1] if len(sys.argv) > 1 else "cpython/Objects/sliceobject.c")
+match = re.search(
+    r"\nslice_richcompare\(PyObject \*v, PyObject \*w, int op\)\s*\{(.*?)\n\}",
+    source.read_text(),
+    re.S,
+)
+assert match, "slice_richcompare definition not found"
+body = re.sub(r"/\*.*?\*/", "", match.group(1), flags=re.S)
+declarations = re.match(
+    r"\s*PyObject \*t1;\s*PyObject \*t2;\s*PyObject \*res;", body
+)
+assert declarations, "slice_richcompare must declare t1, t2, res without initializers at function entry"
+
+expected_statements = """
+    if (!PySlice_Check(v) || !PySlice_Check(w))
+        Py_RETURN_NOTIMPLEMENTED;
+    if (v == w) {
+        switch (op) {
+        case Py_EQ:
+        case Py_LE:
+        case Py_GE:
+            res = Py_True;
+            break;
+        default:
+            res = Py_False;
+            break;
+        }
+        Py_INCREF(res);
+        return res;
+    }
+    t1 = PyTuple_Pack(3,
+                     ((PySliceObject *)v)->start,
+                     ((PySliceObject *)v)->stop,
+                     ((PySliceObject *)v)->step);
+    if (t1 == NULL) {
+        return NULL;
+    }
+    t2 = PyTuple_Pack(3,
+                     ((PySliceObject *)w)->start,
+                     ((PySliceObject *)w)->stop,
+                     ((PySliceObject *)w)->step);
+    if (t2 == NULL) {
+        Py_DECREF(t1);
+        return NULL;
+    }
+    res = PyObject_RichCompare(t1, t2, op);
+    Py_DECREF(t1);
+    Py_DECREF(t2);
+    return res;
+"""
+assert body[declarations.end():].split() == expected_statements.split(), (
+    "slice_richcompare must preserve shortcut/allocation/failure/comparison/refcount order without late declarations"
+)
+print("slice_richcompare C89 declarations and allocation/refcount order: PASS")