From a11419e220b9a8bca50c50b80fd24d09fa8bf408 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 12 Aug 2026 21:28:18 +0200
Subject: [PATCH 1/2] gh-155561: Use PySlot API in Modules/_testlimitedcapi.c

---
 Modules/_testlimitedcapi.c | 109 +++++++++++++++++--------------------
 1 file changed, 49 insertions(+), 60 deletions(-)

diff --git a/Modules/_testlimitedcapi.c b/Modules/_testlimitedcapi.c
index de8bed77d7d327..6841561d671093 100644
--- a/Modules/_testlimitedcapi.c
+++ b/Modules/_testlimitedcapi.c
@@ -2,122 +2,111 @@
  * Test the limited C API.
  *
  * The 'test_*' functions exported by this module are run as part of the
- * standard Python regression test, via Lib/test/test_capi.py.
+ * standard Python regression test, via Lib/test/test_capi/test_misc.py.
  */
 
-#include "pyconfig.h"   // Py_GIL_DISABLED
-
-#ifdef Py_GIL_DISABLED
-   // Cannot test the limited C API
-#else
-   // Use the oldest limited C API version
-#  define Py_LIMITED_API 0x03020000
-#endif
+// Need limited C API version 3.15 for PySlot
+#define Py_LIMITED_API 0x030f0000
 
 #include "_testlimitedcapi/parts.h"
 
-static PyMethodDef TestMethods[] = {
-    {NULL, NULL} /* sentinel */
-};
-
-static struct PyModuleDef _testlimitedcapimodule = {
-    PyModuleDef_HEAD_INIT,
-    .m_name = "_testlimitedcapi",
-    .m_size = 0,
-    .m_methods = TestMethods,
-};
-
-PyMODINIT_FUNC
-PyInit__testlimitedcapi(void)
+static int
+module_exec(PyObject *mod)
 {
-    PyObject *mod = PyModule_Create(&_testlimitedcapimodule);
-    if (mod == NULL) {
-        return NULL;
-    }
-#ifdef Py_GIL_DISABLED
-    PyUnstable_Module_SetGIL(mod, Py_MOD_GIL_NOT_USED);
-#endif
-
     if (_PyTestLimitedCAPI_Init_Abstract(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_ByteArray(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Bytes(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Capsule(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Codec(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Complex(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Dict(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Eval(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Float(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_HeaptypeRelative(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Import(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_List(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Long(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Object(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_PyOS(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Set(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Slots(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Sys(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_ThreadState(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Tuple(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Unicode(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_VectorcallLimited(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Version(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_File(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Weakref(mod) < 0) {
-        return NULL;
+        return -1;
     }
     if (_PyTestLimitedCAPI_Init_Run(mod) < 0) {
-        return NULL;
+        return -1;
     }
-    if (_PyTestLimitedCAPI_Init_Type(mod) < 0) {
-        return NULL;
-    }
-    return mod;
+    return 0;
+}
+
+PyABIInfo_VAR(abi_info);
+
+static PySlot _testlimitedcapimodule_slots[] = {
+    PySlot_DATA(Py_mod_abi, &abi_info),
+    PySlot_STATIC_DATA(Py_mod_name, "_testlimitedcapi"),
+    PySlot_SIZE(Py_mod_state_size, 0),
+    PySlot_FUNC(Py_mod_exec, module_exec),
+    PySlot_SIZE(Py_mod_gil, Py_MOD_GIL_NOT_USED),
+    PySlot_END
+};
+
+PyMODEXPORT_FUNC
+PyModExport__testlimitedcapi(void)
+{
+    return _testlimitedcapimodule_slots;
 }

From 27c121d7cef39b4d77cf54caf2cc9bc21976d494 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Thu, 13 Aug 2026 14:14:02 +0200
Subject: [PATCH 2/2] Add missing _PyTestLimitedCAPI_Init_Type() call

---
 Modules/_testlimitedcapi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Modules/_testlimitedcapi.c b/Modules/_testlimitedcapi.c
index 6841561d671093..e9c3e00d7f6daa 100644
--- a/Modules/_testlimitedcapi.c
+++ b/Modules/_testlimitedcapi.c
@@ -91,6 +91,9 @@ module_exec(PyObject *mod)
     if (_PyTestLimitedCAPI_Init_Run(mod) < 0) {
         return -1;
     }
+    if (_PyTestLimitedCAPI_Init_Type(mod) < 0) {
+        return -1;
+    }
     return 0;
 }