[GR-47888] Add missing tp_alloc to type class

PullRequest: graalpython/2912

Author: qunaibit

graalpython/com.oracle.graal.python.cext/src/capi.h

@@ -800,7 +800,7 @@ extern size_t PyTruffle_NativeMemoryGCBarrier;
 #undef bool // may be defined as "_Bool"
 // alphabetical, but base types first
 #define PY_TYPE_OBJECTS \
-PY_TRUFFLE_TYPE_WITH_ITEMSIZE(PyType_Type, type, 				&PyType_Type, sizeof(PyHeapTypeObject), sizeof(PyMemberDef)) \
+PY_TRUFFLE_TYPE_GENERIC(PyType_Type, type, 				&PyType_Type, sizeof(PyHeapTypeObject), sizeof(PyMemberDef), PyType_GenericAlloc, object_dealloc, PyObject_GC_Del, 0) \
 PY_TRUFFLE_TYPE_WITH_ALLOC(PyBaseObject_Type, object, 			&PyType_Type, sizeof(PyObject), PyType_GenericAlloc, object_dealloc, PyObject_Del) \
 PY_TRUFFLE_TYPE(PyCFunction_Type, 		builtin_function_or_method, &PyType_Type, sizeof(PyCFunctionObject)) \
 PY_TRUFFLE_TYPE(_PyBytesIOBuffer_Type,	_BytesIOBuffer, 		&PyType_Type, 0) \

graalpython/com.oracle.graal.python.test/src/tests/cpyext/test_object.py

@@ -587,6 +587,18 @@ class MyClass:
         assert tester.get_tp_name(int) == 'int'
         assert tester.get_tp_name(type(tester)) == 'TestTpName.TestTpName'
 
+    def test_tp_alloc(self):
+        TestTpAlloc = CPyExtType("TestTpAlloc",
+                                '''
+                                static PyObject* testslots_tp_alloc(PyObject* self) {
+                                    return (PyObject*) PyType_Type.tp_alloc(&PyType_Type, 0);
+                                }
+                                ''',
+                                tp_methods='{"get_tp_alloc", (PyCFunction)testslots_tp_alloc, METH_NOARGS, ""}',
+                                )
+        tester = TestTpAlloc()
+        assert tester.get_tp_alloc() != None
+
     def test_slots_initialized(self):
         TestSlotsInitialized = CPyExtType("TestSlotsInitialized", 
                               '''