bpo-41861: Convert _sqlite3 PrepareProtocolType to heap type (GH-22428)

5 files changed, 33 insertions, 54 deletions

diff --git a/Modules/_sqlite/microprotocols.c b/Modules/_sqlite/microprotocols.c
index 3b2d7f4..64095ad 100644
--- a/Modules/_sqlite/microprotocols.c
+++ b/Modules/_sqlite/microprotocols.c
@@ -56,7 +56,7 @@ pysqlite_microprotocols_add(PyTypeObject *type, PyObject *proto, PyObject *cast)
     PyObject* key;
     int rc;
 
-    if (proto == NULL) proto = (PyObject*)&pysqlite_PrepareProtocolType;
+    if (proto == NULL) proto = (PyObject*)pysqlite_PrepareProtocolType;
 
     key = Py_BuildValue("(OO)", (PyObject*)type, proto);
     if (!key) {
@@ -152,7 +152,7 @@ PyObject *
 pysqlite_adapt(pysqlite_Cursor *self, PyObject *args)
 {
     PyObject *obj, *alt = NULL;
-    PyObject *proto = (PyObject*)&pysqlite_PrepareProtocolType;
+    PyObject *proto = (PyObject*)pysqlite_PrepareProtocolType;
 
     if (!PyArg_ParseTuple(args, "O|OO", &obj, &proto, &alt)) return NULL;
     return pysqlite_microprotocols_adapt(obj, proto, alt);
diff --git a/Modules/_sqlite/module.c b/Modules/_sqlite/module.c
index 625d065..d0a546c 100644
--- a/Modules/_sqlite/module.c
+++ b/Modules/_sqlite/module.c
@@ -176,7 +176,7 @@ static PyObject* module_register_adapter(PyObject* self, PyObject* args)
         pysqlite_BaseTypeAdapted = 1;
     }
 
-    rc = pysqlite_microprotocols_add(type, (PyObject*)&pysqlite_PrepareProtocolType, caster);
+    rc = pysqlite_microprotocols_add(type, (PyObject*)pysqlite_PrepareProtocolType, caster);
     if (rc == -1)
         return NULL;
 
@@ -357,7 +357,7 @@ PyMODINIT_FUNC PyInit__sqlite3(void)
         (pysqlite_connection_setup_types() < 0) ||
         (pysqlite_cache_setup_types(module) < 0) ||
         (pysqlite_statement_setup_types() < 0) ||
-        (pysqlite_prepare_protocol_setup_types() < 0)
+        (pysqlite_prepare_protocol_setup_types(module) < 0)
        ) {
         Py_XDECREF(module);
         return NULL;
@@ -365,7 +365,7 @@ PyMODINIT_FUNC PyInit__sqlite3(void)
 
     ADD_TYPE(module, pysqlite_ConnectionType);
     ADD_TYPE(module, pysqlite_CursorType);
-    ADD_TYPE(module, pysqlite_PrepareProtocolType);
+    ADD_TYPE(module, *pysqlite_PrepareProtocolType);
     ADD_TYPE(module, pysqlite_RowType);
 
     if (!(dict = PyModule_GetDict(module))) {
diff --git a/Modules/_sqlite/prepare_protocol.c b/Modules/_sqlite/prepare_protocol.c
index 05a2ca5..7daf8a6 100644
--- a/Modules/_sqlite/prepare_protocol.c
+++ b/Modules/_sqlite/prepare_protocol.c
@@ -30,54 +30,33 @@ int pysqlite_prepare_protocol_init(pysqlite_PrepareProtocol* self, PyObject* arg
 
 void pysqlite_prepare_protocol_dealloc(pysqlite_PrepareProtocol* self)
 {
-    Py_TYPE(self)->tp_free((PyObject*)self);
+    PyTypeObject *tp = Py_TYPE(self);
+
+    tp->tp_free(self);
+    Py_DECREF(tp);
 }
 
-PyTypeObject pysqlite_PrepareProtocolType= {
-        PyVarObject_HEAD_INIT(NULL, 0)
-        MODULE_NAME ".PrepareProtocol",                 /* tp_name */
-        sizeof(pysqlite_PrepareProtocol),               /* tp_basicsize */
-        0,                                              /* tp_itemsize */
-        (destructor)pysqlite_prepare_protocol_dealloc,  /* tp_dealloc */
-        0,                                              /* tp_vectorcall_offset */
-        0,                                              /* tp_getattr */
-        0,                                              /* tp_setattr */
-        0,                                              /* tp_as_async */
-        0,                                              /* tp_repr */
-        0,                                              /* tp_as_number */
-        0,                                              /* tp_as_sequence */
-        0,                                              /* tp_as_mapping */
-        0,                                              /* tp_hash */
-        0,                                              /* tp_call */
-        0,                                              /* tp_str */
-        0,                                              /* tp_getattro */
-        0,                                              /* tp_setattro */
-        0,                                              /* tp_as_buffer */
-        Py_TPFLAGS_DEFAULT,                             /* tp_flags */
-        0,                                              /* tp_doc */
-        0,                                              /* tp_traverse */
-        0,                                              /* tp_clear */
-        0,                                              /* tp_richcompare */
-        0,                                              /* tp_weaklistoffset */
-        0,                                              /* tp_iter */
-        0,                                              /* tp_iternext */
-        0,                                              /* tp_methods */
-        0,                                              /* tp_members */
-        0,                                              /* tp_getset */
-        0,                                              /* tp_base */
-        0,                                              /* tp_dict */
-        0,                                              /* tp_descr_get */
-        0,                                              /* tp_descr_set */
-        0,                                              /* tp_dictoffset */
-        (initproc)pysqlite_prepare_protocol_init,       /* tp_init */
-        0,                                              /* tp_alloc */
-        0,                                              /* tp_new */
-        0                                               /* tp_free */
+static PyType_Slot type_slots[] = {
+    {Py_tp_dealloc, pysqlite_prepare_protocol_dealloc},
+    {Py_tp_new, PyType_GenericNew},
+    {Py_tp_init, pysqlite_prepare_protocol_init},
+    {0, NULL},
+};
+
+static PyType_Spec type_spec = {
+    .name = MODULE_NAME ".PrepareProtocol",
+    .basicsize = sizeof(pysqlite_PrepareProtocol),
+    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HEAPTYPE,
+    .slots = type_slots,
 };
 
-extern int pysqlite_prepare_protocol_setup_types(void)
+PyTypeObject *pysqlite_PrepareProtocolType = NULL;
+
+extern int pysqlite_prepare_protocol_setup_types(PyObject *module)
 {
-    pysqlite_PrepareProtocolType.tp_new = PyType_GenericNew;
-    Py_SET_TYPE(&pysqlite_PrepareProtocolType, &PyType_Type);
-    return PyType_Ready(&pysqlite_PrepareProtocolType);
+    pysqlite_PrepareProtocolType = (PyTypeObject *)PyType_FromModuleAndSpec(module, &type_spec, NULL);
+    if (pysqlite_PrepareProtocolType == NULL) {
+        return -1;
+    }
+    return 0;
 }
diff --git a/Modules/_sqlite/prepare_protocol.h b/Modules/_sqlite/prepare_protocol.h
index 3998a55..d0f717c 100644
--- a/Modules/_sqlite/prepare_protocol.h
+++ b/Modules/_sqlite/prepare_protocol.h
@@ -31,12 +31,12 @@ typedef struct
     PyObject_HEAD
 } pysqlite_PrepareProtocol;
 
-extern PyTypeObject pysqlite_PrepareProtocolType;
+extern PyTypeObject *pysqlite_PrepareProtocolType;
 
 int pysqlite_prepare_protocol_init(pysqlite_PrepareProtocol* self, PyObject* args, PyObject* kwargs);
 void pysqlite_prepare_protocol_dealloc(pysqlite_PrepareProtocol* self);
 
-int pysqlite_prepare_protocol_setup_types(void);
+int pysqlite_prepare_protocol_setup_types(PyObject *module);
 
 #define UNKNOWN (-1)
 #endif
diff --git a/Modules/_sqlite/statement.c b/Modules/_sqlite/statement.c
index 02e47a0..0458e11 100644
--- a/Modules/_sqlite/statement.c
+++ b/Modules/_sqlite/statement.c
@@ -255,7 +255,7 @@ void pysqlite_statement_bind_parameters(pysqlite_Statement* self, PyObject* para
             if (!_need_adapt(current_param)) {
                 adapted = current_param;
             } else {
-                adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, current_param);
+                adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)pysqlite_PrepareProtocolType, current_param);
                 Py_DECREF(current_param);
                 if (!adapted) {
                     return;
@@ -306,7 +306,7 @@ void pysqlite_statement_bind_parameters(pysqlite_Statement* self, PyObject* para
             if (!_need_adapt(current_param)) {
                 adapted = current_param;
             } else {
-                adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, current_param);
+                adapted = pysqlite_microprotocols_adapt(current_param, (PyObject*)pysqlite_PrepareProtocolType, current_param);
                 Py_DECREF(current_param);
                 if (!adapted) {
                     return;