[3.13] gh-117482: Fix Builtin Types Slot Wrappers (gh-121630)

When builtin static types are initialized for a subinterpreter, various "tp" slots have already been inherited (for the main interpreter).  This was interfering with the logic in add_operators() (in Objects/typeobject.c), causing a wrapper to get created when it shouldn't.  This change fixes that by preserving the original data from the static type struct and checking that.

(cherry picked from commit 5250a03133, AKA gh-121602)

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>

Include/internal/pycore_typeobject.h

@@ -33,6 +33,7 @@ struct _types_runtime_state {
     struct {
         struct {
             PyTypeObject *type;
+            PyTypeObject def;
             int64_t interp_count;
         } types[_Py_MAX_MANAGED_STATIC_TYPES];
     } managed_static;

Lib/test/test_types.py

@@ -10,6 +10,7 @@
 import pickle
 import locale
 import sys
+import textwrap
 import types
 import unittest.mock
 import weakref
@@ -2345,5 +2346,40 @@ def ex(a, /, b, *, c):
             )
 
 
+class SubinterpreterTests(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        global interpreters
+        try:
+            from test.support import interpreters
+        except ModuleNotFoundError:
+            raise unittest.SkipTest('subinterpreters required')
+        import test.support.interpreters.channels
+
+    @cpython_only
+    def test_slot_wrappers(self):
+        rch, sch = interpreters.channels.create()
+
+        # For now it's sufficient to check int.__str__.
+        # See https://github.com/python/cpython/issues/117482
+        # and https://github.com/python/cpython/pull/117660.
+        script = textwrap.dedent('''
+            text = repr(int.__str__)
+            sch.send_nowait(text)
+            ''')
+
+        exec(script)
+        expected = rch.recv()
+
+        interp = interpreters.create()
+        interp.exec('from test.support import interpreters')
+        interp.prepare_main(sch=sch)
+        interp.exec(script)
+        results = rch.recv()
+
+        self.assertEqual(results, expected)
+
+
 if __name__ == '__main__':
     unittest.main()

Misc/NEWS.d/next/Core and Builtins/2024-07-10-15-43-54.gh-issue-117482.5WYaXR.rst

@@ -0,0 +1,2 @@
+Unexpected slot wrappers are no longer created for builtin static types in
+subinterpreters.

Objects/typeobject.c

@@ -314,6 +314,16 @@ managed_static_type_state_clear(PyInterpreterState *interp, PyTypeObject *self,
     }
 }
 
+static PyTypeObject *
+managed_static_type_get_def(PyTypeObject *self, int isbuiltin)
+{
+    size_t index = managed_static_type_index_get(self);
+    size_t full_index = isbuiltin
+        ? index
+        : index + _Py_MAX_MANAGED_STATIC_BUILTIN_TYPES;
+    return &_PyRuntime.types.managed_static.types[full_index].def;
+}
+
 // Also see _PyStaticType_InitBuiltin() and _PyStaticType_FiniBuiltin().
 
 /* end static builtin helpers */
@@ -5668,7 +5678,6 @@ fini_static_type(PyInterpreterState *interp, PyTypeObject *type,
 
     _PyStaticType_ClearWeakRefs(interp, type);
     managed_static_type_state_clear(interp, type, isbuiltin, final);
-    /* We leave _Py_TPFLAGS_STATIC_BUILTIN set on tp_flags. */
 }
 
 void
@@ -7671,7 +7680,7 @@ inherit_slots(PyTypeObject *type, PyTypeObject *base)
     return 0;
 }
 
-static int add_operators(PyTypeObject *);
+static int add_operators(PyTypeObject *, PyTypeObject *);
 static int add_tp_new_wrapper(PyTypeObject *type);
 
 #define COLLECTION_FLAGS (Py_TPFLAGS_SEQUENCE | Py_TPFLAGS_MAPPING)
@@ -7836,10 +7845,10 @@ type_dict_set_doc(PyTypeObject *type)
 
 
 static int
-type_ready_fill_dict(PyTypeObject *type)
+type_ready_fill_dict(PyTypeObject *type, PyTypeObject *def)
 {
     /* Add type-specific descriptors to tp_dict */
-    if (add_operators(type) < 0) {
+    if (add_operators(type, def) < 0) {
         return -1;
     }
     if (type_add_methods(type) < 0) {
@@ -8158,7 +8167,7 @@ type_ready_post_checks(PyTypeObject *type)
 
 
 static int
-type_ready(PyTypeObject *type, int initial)
+type_ready(PyTypeObject *type, PyTypeObject *def, int initial)
 {
     ASSERT_TYPE_LOCK_HELD();
 
@@ -8197,7 +8206,7 @@ type_ready(PyTypeObject *type, int initial)
     if (type_ready_set_new(type, initial) < 0) {
         goto error;
     }
-    if (type_ready_fill_dict(type) < 0) {
+    if (type_ready_fill_dict(type, def) < 0) {
         goto error;
     }
     if (initial) {
@@ -8254,7 +8263,7 @@ PyType_Ready(PyTypeObject *type)
     int res;
     BEGIN_TYPE_LOCK();
     if (!(type->tp_flags & Py_TPFLAGS_READY)) {
-        res = type_ready(type, 1);
+        res = type_ready(type, NULL, 1);
     } else {
         res = 0;
         assert(_PyType_CheckConsistency(type));
@@ -8290,14 +8299,20 @@ init_static_type(PyInterpreterState *interp, PyTypeObject *self,
 
     managed_static_type_state_init(interp, self, isbuiltin, initial);
 
+    PyTypeObject *def = managed_static_type_get_def(self, isbuiltin);
+    if (initial) {
+        memcpy(def, self, sizeof(PyTypeObject));
+    }
+
     int res;
     BEGIN_TYPE_LOCK();
-    res = type_ready(self, initial);
+    res = type_ready(self, def, initial);
     END_TYPE_LOCK();
     if (res < 0) {
         _PyStaticType_ClearWeakRefs(interp, self);
         managed_static_type_state_clear(interp, self, isbuiltin, initial);
     }
+
     return res;
 }
 
@@ -10885,17 +10900,22 @@ recurse_down_subclasses(PyTypeObject *type, PyObject *attr_name,
    infinite recursion here.) */
 
 static int
-add_operators(PyTypeObject *type)
+add_operators(PyTypeObject *type, PyTypeObject *def)
 {
     PyObject *dict = lookup_tp_dict(type);
     pytype_slotdef *p;
     PyObject *descr;
     void **ptr;
 
+    assert(def == NULL || (type->tp_flags & _Py_TPFLAGS_STATIC_BUILTIN));
+    if (def == NULL) {
+        def = type;
+    }
+
     for (p = slotdefs; p->name; p++) {
         if (p->wrapper == NULL)
             continue;
-        ptr = slotptr(type, p->offset);
+        ptr = slotptr(def, p->offset);
         if (!ptr || !*ptr)
             continue;
         int r = PyDict_Contains(dict, p->name_strobj);