bpo-39573: Use Py_TYPE() macro in Objects directory (GH-18392)

Replace direct access to PyObject.ob_type with Py_TYPE().

Objects/bytearrayobject.c

@@ -856,7 +856,7 @@ bytearray_init(PyByteArrayObject *self, PyObject *args, PyObject *kwds)
         if (PyErr_ExceptionMatches(PyExc_TypeError)) {
             PyErr_Format(PyExc_TypeError,
                          "cannot convert '%.200s' object to bytearray",
-                         arg->ob_type->tp_name);
+                         Py_TYPE(arg)->tp_name);
         }
         return -1;
     }
@@ -1630,7 +1630,7 @@ bytearray_extend(PyByteArrayObject *self, PyObject *iterable_of_ints)
         if (PyErr_ExceptionMatches(PyExc_TypeError)) {
             PyErr_Format(PyExc_TypeError,
                          "can't extend bytearray with %.100s",
-                         iterable_of_ints->ob_type->tp_name);
+                         Py_TYPE(iterable_of_ints)->tp_name);
         }
         return NULL;
     }

Objects/bytesobject.c

@@ -2762,7 +2762,7 @@ PyBytes_FromObject(PyObject *x)
 
     PyErr_Format(PyExc_TypeError,
                  "cannot convert '%.200s' object to bytes",
-                 x->ob_type->tp_name);
+                 Py_TYPE(x)->tp_name);
     return NULL;
 }
 

Objects/call.c

@@ -263,11 +263,11 @@ _PyObject_Call(PyThreadState *tstate, PyObject *callable,
         return PyVectorcall_Call(callable, args, kwargs);
     }
     else {
-        call = callable->ob_type->tp_call;
+        call = Py_TYPE(callable)->tp_call;
         if (call == NULL) {
             _PyErr_Format(tstate, PyExc_TypeError,
                           "'%.200s' object is not callable",
-                          callable->ob_type->tp_name);
+                          Py_TYPE(callable)->tp_name);
             return NULL;
         }
 

Objects/cellobject.c

@@ -112,7 +112,7 @@ cell_repr(PyCellObject *op)
         return PyUnicode_FromFormat("<cell at %p: empty>", op);
 
     return PyUnicode_FromFormat("<cell at %p: %.80s object at %p>",
-                               op, op->ob_ref->ob_type->tp_name,
+                               op, Py_TYPE(op->ob_ref)->tp_name,
                                op->ob_ref);
 }
 

Objects/classobject.c

@@ -178,7 +178,7 @@ static PyObject *
 method_getattro(PyObject *obj, PyObject *name)
 {
     PyMethodObject *im = (PyMethodObject *)obj;
-    PyTypeObject *tp = obj->ob_type;
+    PyTypeObject *tp = Py_TYPE(obj);
     PyObject *descr = NULL;
 
     {
@@ -190,9 +190,9 @@ method_getattro(PyObject *obj, PyObject *name)
     }
 
     if (descr != NULL) {
-        descrgetfunc f = TP_DESCR_GET(descr->ob_type);
+        descrgetfunc f = TP_DESCR_GET(Py_TYPE(descr));
         if (f != NULL)
-            return f(descr, obj, (PyObject *)obj->ob_type);
+            return f(descr, obj, (PyObject *)Py_TYPE(obj));
         else {
             Py_INCREF(descr);
             return descr;
@@ -425,7 +425,7 @@ static PyGetSetDef instancemethod_getset[] = {
 static PyObject *
 instancemethod_getattro(PyObject *self, PyObject *name)
 {
-    PyTypeObject *tp = self->ob_type;
+    PyTypeObject *tp = Py_TYPE(self);
     PyObject *descr = NULL;
 
     if (tp->tp_dict == NULL) {
@@ -435,9 +435,9 @@ instancemethod_getattro(PyObject *self, PyObject *name)
     descr = _PyType_Lookup(tp, name);
 
     if (descr != NULL) {
-        descrgetfunc f = TP_DESCR_GET(descr->ob_type);
+        descrgetfunc f = TP_DESCR_GET(Py_TYPE(descr));
         if (f != NULL)
-            return f(descr, self, (PyObject *)self->ob_type);
+            return f(descr, self, (PyObject *)Py_TYPE(self));
         else {
             Py_INCREF(descr);
             return descr;

Objects/codeobject.c

@@ -416,7 +416,7 @@ validate_and_copy_tuple(PyObject *tup)
                 PyExc_TypeError,
                 "name tuples must contain only "
                 "strings, not '%.500s'",
-                item->ob_type->tp_name);
+                Py_TYPE(item)->tp_name);
             Py_DECREF(newtuple);
             return NULL;
         }

Objects/complexobject.c

@@ -296,7 +296,7 @@ try_complex_special_method(PyObject *op)
         if (!PyComplex_Check(res)) {
             PyErr_Format(PyExc_TypeError,
                 "__complex__ returned non-complex (type %.200s)",
-                res->ob_type->tp_name);
+                Py_TYPE(res)->tp_name);
             Py_DECREF(res);
             return NULL;
         }
@@ -305,7 +305,7 @@ try_complex_special_method(PyObject *op)
                 "__complex__ returned non-complex (type %.200s).  "
                 "The ability to return an instance of a strict subclass of complex "
                 "is deprecated, and may be removed in a future version of Python.",
-                res->ob_type->tp_name)) {
+                Py_TYPE(res)->tp_name)) {
             Py_DECREF(res);
             return NULL;
         }
@@ -958,7 +958,7 @@ complex_new_impl(PyTypeObject *type, PyObject *r, PyObject *i)
         return NULL;
     }
 
-    nbr = r->ob_type->tp_as_number;
+    nbr = Py_TYPE(r)->tp_as_number;
     if (nbr == NULL || (nbr->nb_float == NULL && nbr->nb_index == NULL)) {
         PyErr_Format(PyExc_TypeError,
                      "complex() first argument must be a string or a number, "
@@ -970,7 +970,7 @@ complex_new_impl(PyTypeObject *type, PyObject *r, PyObject *i)
         return NULL;
     }
     if (i != NULL) {
-        nbi = i->ob_type->tp_as_number;
+        nbi = Py_TYPE(i)->tp_as_number;
         if (nbi == NULL || (nbi->nb_float == NULL && nbi->nb_index == NULL)) {
             PyErr_Format(PyExc_TypeError,
                          "complex() second argument must be a number, "

Objects/descrobject.c

@@ -84,7 +84,7 @@ descr_check(PyDescrObject *descr, PyObject *obj, PyObject **pres)
                      "doesn't apply to a '%.100s' object",
                      descr_name((PyDescrObject *)descr), "?",
                      descr->d_type->tp_name,
-                     obj->ob_type->tp_name);
+                     Py_TYPE(obj)->tp_name);
         *pres = NULL;
         return 1;
     }
@@ -97,7 +97,7 @@ classmethod_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
     /* Ensure a valid type.  Class methods ignore obj. */
     if (type == NULL) {
         if (obj != NULL)
-            type = (PyObject *)obj->ob_type;
+            type = (PyObject *)Py_TYPE(obj);
         else {
             /* Wot - no type?! */
             PyErr_Format(PyExc_TypeError,
@@ -114,7 +114,7 @@ classmethod_get(PyMethodDescrObject *descr, PyObject *obj, PyObject *type)
                      "needs a type, not a '%.100s' as arg 2",
                      descr_name((PyDescrObject *)descr), "?",
                      PyDescr_TYPE(descr)->tp_name,
-                     type->ob_type->tp_name);
+                     Py_TYPE(type)->tp_name);
         return NULL;
     }
     if (!PyType_IsSubtype((PyTypeObject *)type, PyDescr_TYPE(descr))) {
@@ -194,7 +194,7 @@ descr_setcheck(PyDescrObject *descr, PyObject *obj, PyObject *value,
                      "doesn't apply to a '%.100s' object",
                      descr_name(descr), "?",
                      descr->d_type->tp_name,
-                     obj->ob_type->tp_name);
+                     Py_TYPE(obj)->tp_name);
         *pres = -1;
         return 1;
     }
@@ -506,7 +506,7 @@ wrapperdescr_call(PyWrapperDescrObject *descr, PyObject *args, PyObject *kwds)
                      "but received a '%.100s'",
                      descr_name((PyDescrObject *)descr), "?",
                      PyDescr_TYPE(descr)->tp_name,
-                     self->ob_type->tp_name);
+                     Py_TYPE(self)->tp_name);
         return NULL;
     }
 
@@ -1234,7 +1234,7 @@ wrapper_repr(wrapperobject *wp)
 {
     return PyUnicode_FromFormat("<method-wrapper '%s' of %s object at %p>",
                                wp->descr->d_base->name,
-                               wp->self->ob_type->tp_name,
+                               Py_TYPE(wp->self)->tp_name,
                                wp->self);
 }
 
@@ -1476,7 +1476,7 @@ property_dealloc(PyObject *self)
     Py_XDECREF(gs->prop_set);
     Py_XDECREF(gs->prop_del);
     Py_XDECREF(gs->prop_doc);
-    self->ob_type->tp_free(self);
+    Py_TYPE(self)->tp_free(self);
 }
 
 static PyObject *

Objects/dictobject.c

@@ -4015,7 +4015,7 @@ _PyDictView_New(PyObject *dict, PyTypeObject *type)
         /* XXX Get rid of this restriction later */
         PyErr_Format(PyExc_TypeError,
                      "%s() requires a dict argument, not '%s'",
-                     type->tp_name, dict->ob_type->tp_name);
+                     type->tp_name, Py_TYPE(dict)->tp_name);
         return NULL;
     }
     dv = PyObject_GC_New(_PyDictViewObject, type);

Objects/floatobject.c

@@ -256,7 +256,7 @@ PyFloat_AsDouble(PyObject *op)
             return val;
         }
         PyErr_Format(PyExc_TypeError, "must be real number, not %.50s",
-                     op->ob_type->tp_name);
+                     Py_TYPE(op)->tp_name);
         return -1;
     }
 
@@ -268,7 +268,7 @@ PyFloat_AsDouble(PyObject *op)
         if (!PyFloat_Check(res)) {
             PyErr_Format(PyExc_TypeError,
                          "%.50s.__float__ returned non-float (type %.50s)",
-                         op->ob_type->tp_name, res->ob_type->tp_name);
+                         Py_TYPE(op)->tp_name, Py_TYPE(res)->tp_name);
             Py_DECREF(res);
             return -1;
         }
@@ -276,7 +276,7 @@ PyFloat_AsDouble(PyObject *op)
                 "%.50s.__float__ returned non-float (type %.50s).  "
                 "The ability to return an instance of a strict subclass of float "
                 "is deprecated, and may be removed in a future version of Python.",
-                op->ob_type->tp_name, res->ob_type->tp_name)) {
+                Py_TYPE(op)->tp_name, Py_TYPE(res)->tp_name)) {
             Py_DECREF(res);
             return -1;
         }

Objects/funcobject.c

@@ -196,7 +196,7 @@ PyFunction_SetClosure(PyObject *op, PyObject *closure)
     else {
         PyErr_Format(PyExc_SystemError,
                      "expected tuple for closure, got '%.100s'",
-                     closure->ob_type->tp_name);
+                     Py_TYPE(closure)->tp_name);
         return -1;
     }
     Py_XSETREF(((PyFunctionObject *)op)->func_closure, closure);
@@ -541,7 +541,7 @@ func_new_impl(PyTypeObject *type, PyCodeObject *code, PyObject *globals,
             if (!PyCell_Check(o)) {
                 return PyErr_Format(PyExc_TypeError,
                     "arg 5 (closure) expected cell, found %s",
-                                    o->ob_type->tp_name);
+                                    Py_TYPE(o)->tp_name);
             }
         }
     }

Objects/interpreteridobject.c

@@ -56,7 +56,7 @@ interp_id_converter(PyObject *arg, void *ptr)
     else {
         PyErr_Format(PyExc_TypeError,
                      "interpreter ID must be an int, got %.100s",
-                     arg->ob_type->tp_name);
+                     Py_TYPE(arg)->tp_name);
         return 0;
     }
     *(int64_t *)ptr = id;

Objects/listobject.c

@@ -493,7 +493,7 @@ list_concat(PyListObject *a, PyObject *bb)
     if (!PyList_Check(bb)) {
         PyErr_Format(PyExc_TypeError,
                   "can only concatenate list (not \"%.200s\") to list",
-                  bb->ob_type->tp_name);
+                  Py_TYPE(bb)->tp_name);
         return NULL;
     }
 #define b ((PyListObject *)bb)
@@ -892,7 +892,7 @@ list_extend(PyListObject *self, PyObject *iterable)
     it = PyObject_GetIter(iterable);
     if (it == NULL)
         return NULL;
-    iternext = *it->ob_type->tp_iternext;
+    iternext = *Py_TYPE(it)->tp_iternext;
 
     /* Guess a result list size. */
     n = PyObject_LengthHint(iterable, 8);
@@ -1179,7 +1179,7 @@ struct s_MergeState {
 
     /* This function is used by unsafe_object_compare to optimize comparisons
      * when we know our list is type-homogeneous but we can't assume anything else.
-     * In the pre-sort check it is set equal to key->ob_type->tp_richcompare */
+     * In the pre-sort check it is set equal to Py_TYPE(key)->tp_richcompare */
     PyObject *(*key_richcompare)(PyObject *, PyObject *, int);
 
     /* This function is used by unsafe_tuple_compare to compare the first elements
@@ -2015,7 +2015,7 @@ unsafe_object_compare(PyObject *v, PyObject *w, MergeState *ms)
     PyObject *res_obj; int res;
 
     /* No assumptions, because we check first: */
-    if (v->ob_type->tp_richcompare != ms->key_richcompare)
+    if (Py_TYPE(v)->tp_richcompare != ms->key_richcompare)
         return PyObject_RichCompareBool(v, w, Py_LT);
 
     assert(ms->key_richcompare != NULL);
@@ -2052,8 +2052,8 @@ unsafe_latin_compare(PyObject *v, PyObject *w, MergeState *ms)
     int res;
 
     /* Modified from Objects/unicodeobject.c:unicode_compare, assuming: */
-    assert(v->ob_type == w->ob_type);
-    assert(v->ob_type == &PyUnicode_Type);
+    assert(Py_TYPE(v) == Py_TYPE(w));
+    assert(Py_TYPE(v) == &PyUnicode_Type);
     assert(PyUnicode_KIND(v) == PyUnicode_KIND(w));
     assert(PyUnicode_KIND(v) == PyUnicode_1BYTE_KIND);
 
@@ -2075,8 +2075,8 @@ unsafe_long_compare(PyObject *v, PyObject *w, MergeState *ms)
     PyLongObject *vl, *wl; sdigit v0, w0; int res;
 
     /* Modified from Objects/longobject.c:long_compare, assuming: */
-    assert(v->ob_type == w->ob_type);
-    assert(v->ob_type == &PyLong_Type);
+    assert(Py_TYPE(v) == Py_TYPE(w));
+    assert(Py_TYPE(v) == &PyLong_Type);
     assert(Py_ABS(Py_SIZE(v)) <= 1);
     assert(Py_ABS(Py_SIZE(w)) <= 1);
 
@@ -2103,8 +2103,8 @@ unsafe_float_compare(PyObject *v, PyObject *w, MergeState *ms)
     int res;
 
     /* Modified from Objects/floatobject.c:float_richcompare, assuming: */
-    assert(v->ob_type == w->ob_type);
-    assert(v->ob_type == &PyFloat_Type);
+    assert(Py_TYPE(v) == Py_TYPE(w));
+    assert(Py_TYPE(v) == &PyFloat_Type);
 
     res = PyFloat_AS_DOUBLE(v) < PyFloat_AS_DOUBLE(w);
     assert(res == PyObject_RichCompareBool(v, w, Py_LT));
@@ -2125,8 +2125,8 @@ unsafe_tuple_compare(PyObject *v, PyObject *w, MergeState *ms)
     int k;
 
     /* Modified from Objects/tupleobject.c:tuplerichcompare, assuming: */
-    assert(v->ob_type == w->ob_type);
-    assert(v->ob_type == &PyTuple_Type);
+    assert(Py_TYPE(v) == Py_TYPE(w));
+    assert(Py_TYPE(v) == &PyTuple_Type);
     assert(Py_SIZE(v) > 0);
     assert(Py_SIZE(w) > 0);
 
@@ -2247,12 +2247,12 @@ list_sort_impl(PyListObject *self, PyObject *keyfunc, int reverse)
      * set ms appropriately. */
     if (saved_ob_size > 1) {
         /* Assume the first element is representative of the whole list. */
-        int keys_are_in_tuples = (lo.keys[0]->ob_type == &PyTuple_Type &&
+        int keys_are_in_tuples = (Py_TYPE(lo.keys[0]) == &PyTuple_Type &&
                                   Py_SIZE(lo.keys[0]) > 0);
 
         PyTypeObject* key_type = (keys_are_in_tuples ?
-                                  PyTuple_GET_ITEM(lo.keys[0], 0)->ob_type :
-                                  lo.keys[0]->ob_type);
+                                  Py_TYPE(PyTuple_GET_ITEM(lo.keys[0], 0)) :
+                                  Py_TYPE(lo.keys[0]));
 
         int keys_are_all_same_type = 1;
         int strings_are_latin = 1;
@@ -2262,7 +2262,7 @@ list_sort_impl(PyListObject *self, PyObject *keyfunc, int reverse)
         for (i=0; i < saved_ob_size; i++) {
 
             if (keys_are_in_tuples &&
-                !(lo.keys[i]->ob_type == &PyTuple_Type && Py_SIZE(lo.keys[i]) != 0)) {
+                !(Py_TYPE(lo.keys[i]) == &PyTuple_Type && Py_SIZE(lo.keys[i]) != 0)) {
                 keys_are_in_tuples = 0;
                 keys_are_all_same_type = 0;
                 break;
@@ -2275,7 +2275,7 @@ list_sort_impl(PyListObject *self, PyObject *keyfunc, int reverse)
                              PyTuple_GET_ITEM(lo.keys[i], 0) :
                              lo.keys[i]);
 
-            if (key->ob_type != key_type) {
+            if (Py_TYPE(key) != key_type) {
                 keys_are_all_same_type = 0;
                 /* If keys are in tuple we must loop over the whole list to make
                    sure all items are tuples */
@@ -2818,7 +2818,7 @@ list_subscript(PyListObject* self, PyObject* item)
     else {
         PyErr_Format(PyExc_TypeError,
                      "list indices must be integers or slices, not %.200s",
-                     item->ob_type->tp_name);
+                     Py_TYPE(item)->tp_name);
         return NULL;
     }
 }
@@ -2981,7 +2981,7 @@ list_ass_subscript(PyListObject* self, PyObject* item, PyObject* value)
     else {
         PyErr_Format(PyExc_TypeError,
                      "list indices must be integers or slices, not %.200s",
-                     item->ob_type->tp_name);
+                     Py_TYPE(item)->tp_name);
         return -1;
     }
 }

Objects/longobject.c

@@ -150,7 +150,7 @@ _PyLong_FromNbInt(PyObject *integral)
     if (!PyLong_Check(result)) {
         PyErr_Format(PyExc_TypeError,
                      "__int__ returned non-int (type %.200s)",
-                     result->ob_type->tp_name);
+                     Py_TYPE(result)->tp_name);
         Py_DECREF(result);
         return NULL;
     }
@@ -159,7 +159,7 @@ _PyLong_FromNbInt(PyObject *integral)
             "__int__ returned non-int (type %.200s).  "
             "The ability to return an instance of a strict subclass of int "
             "is deprecated, and may be removed in a future version of Python.",
-            result->ob_type->tp_name)) {
+            Py_TYPE(result)->tp_name)) {
         Py_DECREF(result);
         return NULL;
     }
@@ -203,7 +203,7 @@ _PyLong_FromNbIndexOrNbInt(PyObject *integral)
         if (!PyLong_Check(result)) {
             PyErr_Format(PyExc_TypeError,
                          "__index__ returned non-int (type %.200s)",
-                         result->ob_type->tp_name);
+                         Py_TYPE(result)->tp_name);
             Py_DECREF(result);
             return NULL;
         }
@@ -212,7 +212,7 @@ _PyLong_FromNbIndexOrNbInt(PyObject *integral)
                 "__index__ returned non-int (type %.200s).  "
                 "The ability to return an instance of a strict subclass of int "
                 "is deprecated, and may be removed in a future version of Python.",
-                result->ob_type->tp_name))
+                Py_TYPE(result)->tp_name))
         {
             Py_DECREF(result);
             return NULL;

Objects/methodobject.c

@@ -234,7 +234,7 @@ meth_repr(PyCFunctionObject *m)
                                    m->m_ml->ml_name);
     return PyUnicode_FromFormat("<built-in method %s of %s object at %p>",
                                m->m_ml->ml_name,
-                               m->m_self->ob_type->tp_name,
+                               Py_TYPE(m->m_self)->tp_name,
                                m->m_self);
 }
 

Objects/namespaceobject.c

@@ -73,7 +73,7 @@ namespace_repr(PyObject *ns)
     const char * name;
 
     name = (Py_TYPE(ns) == &_PyNamespace_Type) ? "namespace"
-                                               : ns->ob_type->tp_name;
+                                               : Py_TYPE(ns)->tp_name;
 
     i = Py_ReprEnter(ns);
     if (i != 0) {

Objects/object.c

@@ -33,8 +33,8 @@ _PyObject_CheckConsistency(PyObject *op, int check_content)
     CHECK(!_PyObject_IsFreed(op));
     CHECK(Py_REFCNT(op) >= 1);
 
-    CHECK(op->ob_type != NULL);
-    _PyType_CheckConsistency(op->ob_type);
+    CHECK(Py_TYPE(op) != NULL);
+    _PyType_CheckConsistency(Py_TYPE(op));
 
     if (PyUnicode_Check(op)) {
         _PyUnicode_CheckConsistency(op, check_content);
@@ -299,7 +299,7 @@ PyObject_Print(PyObject *op, FILE *fp, int flags)
             else {
                 PyErr_Format(PyExc_TypeError,
                              "str() or repr() returned '%.100s'",
-                             s->ob_type->tp_name);
+                             Py_TYPE(s)->tp_name);
                 ret = -1;
             }
             Py_XDECREF(s);
@@ -331,7 +331,7 @@ _Py_BreakPoint(void)
 int
 _PyObject_IsFreed(PyObject *op)
 {
-    if (_PyMem_IsPtrFreed(op) || _PyMem_IsPtrFreed(op->ob_type)) {
+    if (_PyMem_IsPtrFreed(op) || _PyMem_IsPtrFreed(Py_TYPE(op))) {
         return 1;
     }
     /* ignore op->ob_ref: its value can have be modified
@@ -406,7 +406,7 @@ PyObject_Repr(PyObject *v)
         return PyUnicode_FromString("<NULL>");
     if (Py_TYPE(v)->tp_repr == NULL)
         return PyUnicode_FromFormat("<%s object at %p>",
-                                    v->ob_type->tp_name, v);
+                                    Py_TYPE(v)->tp_name, v);
 
     PyThreadState *tstate = _PyThreadState_GET();
 #ifdef Py_DEBUG
@@ -422,7 +422,7 @@ PyObject_Repr(PyObject *v)
                                " while getting the repr of an object")) {
         return NULL;
     }
-    res = (*v->ob_type->tp_repr)(v);
+    res = (*Py_TYPE(v)->tp_repr)(v);
     _Py_LeaveRecursiveCall(tstate);
 
     if (res == NULL) {
@@ -431,7 +431,7 @@ PyObject_Repr(PyObject *v)
     if (!PyUnicode_Check(res)) {
         _PyErr_Format(tstate, PyExc_TypeError,
                       "__repr__ returned non-string (type %.200s)",
-                      res->ob_type->tp_name);
+                      Py_TYPE(res)->tp_name);
         Py_DECREF(res);
         return NULL;
     }
@@ -665,22 +665,22 @@ do_richcompare(PyThreadState *tstate, PyObject *v, PyObject *w, int op)
     PyObject *res;
     int checked_reverse_op = 0;
 
-    if (v->ob_type != w->ob_type &&
-        PyType_IsSubtype(w->ob_type, v->ob_type) &&
-        (f = w->ob_type->tp_richcompare) != NULL) {
+    if (Py_TYPE(v) != Py_TYPE(w) &&
+        PyType_IsSubtype(Py_TYPE(w), Py_TYPE(v)) &&
+        (f = Py_TYPE(w)->tp_richcompare) != NULL) {
         checked_reverse_op = 1;
         res = (*f)(w, v, _Py_SwappedOp[op]);
         if (res != Py_NotImplemented)
             return res;
         Py_DECREF(res);
     }
-    if ((f = v->ob_type->tp_richcompare) != NULL) {
+    if ((f = Py_TYPE(v)->tp_richcompare) != NULL) {
         res = (*f)(v, w, op);
         if (res != Py_NotImplemented)
             return res;
         Py_DECREF(res);
     }
-    if (!checked_reverse_op && (f = w->ob_type->tp_richcompare) != NULL) {
+    if (!checked_reverse_op && (f = Py_TYPE(w)->tp_richcompare) != NULL) {
         res = (*f)(w, v, _Py_SwappedOp[op]);
         if (res != Py_NotImplemented)
             return res;
@@ -699,8 +699,8 @@ do_richcompare(PyThreadState *tstate, PyObject *v, PyObject *w, int op)
         _PyErr_Format(tstate, PyExc_TypeError,
                       "'%s' not supported between instances of '%.100s' and '%.100s'",
                       opstrings[op],
-                      v->ob_type->tp_name,
-                      w->ob_type->tp_name);
+                      Py_TYPE(v)->tp_name,
+                      Py_TYPE(w)->tp_name);
         return NULL;
     }
     Py_INCREF(res);
@@ -888,7 +888,7 @@ PyObject_GetAttr(PyObject *v, PyObject *name)
     if (!PyUnicode_Check(name)) {
         PyErr_Format(PyExc_TypeError,
                      "attribute name must be string, not '%.200s'",
-                     name->ob_type->tp_name);
+                     Py_TYPE(name)->tp_name);
         return NULL;
     }
     if (tp->tp_getattro != NULL)
@@ -913,7 +913,7 @@ _PyObject_LookupAttr(PyObject *v, PyObject *name, PyObject **result)
     if (!PyUnicode_Check(name)) {
         PyErr_Format(PyExc_TypeError,
                      "attribute name must be string, not '%.200s'",
-                     name->ob_type->tp_name);
+                     Py_TYPE(name)->tp_name);
         *result = NULL;
         return -1;
     }
@@ -989,7 +989,7 @@ PyObject_SetAttr(PyObject *v, PyObject *name, PyObject *value)
     if (!PyUnicode_Check(name)) {
         PyErr_Format(PyExc_TypeError,
                      "attribute name must be string, not '%.200s'",
-                     name->ob_type->tp_name);
+                     Py_TYPE(name)->tp_name);
         return -1;
     }
     Py_INCREF(name);
@@ -1115,9 +1115,9 @@ _PyObject_GetMethod(PyObject *obj, PyObject *name, PyObject **method)
         if (PyType_HasFeature(Py_TYPE(descr), Py_TPFLAGS_METHOD_DESCRIPTOR)) {
             meth_found = 1;
         } else {
-            f = descr->ob_type->tp_descr_get;
+            f = Py_TYPE(descr)->tp_descr_get;
             if (f != NULL && PyDescr_IsData(descr)) {
-                *method = f(descr, obj, (PyObject *)obj->ob_type);
+                *method = f(descr, obj, (PyObject *)Py_TYPE(obj));
                 Py_DECREF(descr);
                 return 0;
             }
@@ -1188,7 +1188,7 @@ _PyObject_GenericGetAttrWithDict(PyObject *obj, PyObject *name,
     if (!PyUnicode_Check(name)){
         PyErr_Format(PyExc_TypeError,
                      "attribute name must be string, not '%.200s'",
-                     name->ob_type->tp_name);
+                     Py_TYPE(name)->tp_name);
         return NULL;
     }
     Py_INCREF(name);
@@ -1203,9 +1203,9 @@ _PyObject_GenericGetAttrWithDict(PyObject *obj, PyObject *name,
     f = NULL;
     if (descr != NULL) {
         Py_INCREF(descr);
-        f = descr->ob_type->tp_descr_get;
+        f = Py_TYPE(descr)->tp_descr_get;
         if (f != NULL && PyDescr_IsData(descr)) {
-            res = f(descr, obj, (PyObject *)obj->ob_type);
+            res = f(descr, obj, (PyObject *)Py_TYPE(obj));
             if (res == NULL && suppress &&
                     PyErr_ExceptionMatches(PyExc_AttributeError)) {
                 PyErr_Clear();
@@ -1302,7 +1302,7 @@ _PyObject_GenericSetAttrWithDict(PyObject *obj, PyObject *name,
     if (!PyUnicode_Check(name)){
         PyErr_Format(PyExc_TypeError,
                      "attribute name must be string, not '%.200s'",
-                     name->ob_type->tp_name);
+                     Py_TYPE(name)->tp_name);
         return -1;
     }
 
@@ -1315,7 +1315,7 @@ _PyObject_GenericSetAttrWithDict(PyObject *obj, PyObject *name,
 
     if (descr != NULL) {
         Py_INCREF(descr);
-        f = descr->ob_type->tp_descr_set;
+        f = Py_TYPE(descr)->tp_descr_set;
         if (f != NULL) {
             res = f(descr, obj, value);
             goto done;
@@ -1408,15 +1408,15 @@ PyObject_IsTrue(PyObject *v)
         return 0;
     if (v == Py_None)
         return 0;
-    else if (v->ob_type->tp_as_number != NULL &&
-             v->ob_type->tp_as_number->nb_bool != NULL)
-        res = (*v->ob_type->tp_as_number->nb_bool)(v);
-    else if (v->ob_type->tp_as_mapping != NULL &&
-             v->ob_type->tp_as_mapping->mp_length != NULL)
-        res = (*v->ob_type->tp_as_mapping->mp_length)(v);
-    else if (v->ob_type->tp_as_sequence != NULL &&
-             v->ob_type->tp_as_sequence->sq_length != NULL)
-        res = (*v->ob_type->tp_as_sequence->sq_length)(v);
+    else if (Py_TYPE(v)->tp_as_number != NULL &&
+             Py_TYPE(v)->tp_as_number->nb_bool != NULL)
+        res = (*Py_TYPE(v)->tp_as_number->nb_bool)(v);
+    else if (Py_TYPE(v)->tp_as_mapping != NULL &&
+             Py_TYPE(v)->tp_as_mapping->mp_length != NULL)
+        res = (*Py_TYPE(v)->tp_as_mapping->mp_length)(v);
+    else if (Py_TYPE(v)->tp_as_sequence != NULL &&
+             Py_TYPE(v)->tp_as_sequence->sq_length != NULL)
+        res = (*Py_TYPE(v)->tp_as_sequence->sq_length)(v);
     else
         return 1;
     /* if it is negative, it should be either -1 or -2 */
@@ -1443,7 +1443,7 @@ PyCallable_Check(PyObject *x)
 {
     if (x == NULL)
         return 0;
-    return x->ob_type->tp_call != NULL;
+    return Py_TYPE(x)->tp_call != NULL;
 }
 
 

Objects/rangeobject.c

@@ -121,7 +121,7 @@ range_new(PyTypeObject *type, PyObject *args, PyObject *kw)
                             "range expected at least 1 argument, got 0");
             return NULL;
         default:
-            PyErr_Format(PyExc_TypeError, 
+            PyErr_Format(PyExc_TypeError,
                          "range expected at most 3 arguments, got %zd",
                          num_args);
             return NULL;
@@ -631,7 +631,7 @@ range_subscript(rangeobject* self, PyObject* item)
     }
     PyErr_Format(PyExc_TypeError,
                  "range indices must be integers or slices, not %.200s",
-                 item->ob_type->tp_name);
+                 Py_TYPE(item)->tp_name);
     return NULL;
 }
 

Objects/typeobject.c

@@ -2345,7 +2345,7 @@ type_new(PyTypeObject *metatype, PyObject *args, PyObject *kwds)
     assert(args != NULL && PyTuple_Check(args));
     assert(kwds == NULL || PyDict_Check(kwds));
 
-    /* Special case: type(x) should return x->ob_type */
+    /* Special case: type(x) should return Py_TYPE(x) */
     /* We only want type itself to accept the one-argument form (#27157)
        Note: We don't call PyType_CheckExact as that also allows subclasses */
     if (metatype == &PyType_Type) {
@@ -3230,7 +3230,7 @@ type_getattro(PyTypeObject *type, PyObject *name)
     if (!PyUnicode_Check(name)) {
         PyErr_Format(PyExc_TypeError,
                      "attribute name must be string, not '%.200s'",
-                     name->ob_type->tp_name);
+                     Py_TYPE(name)->tp_name);
         return NULL;
     }
 
@@ -3888,12 +3888,12 @@ object_richcompare(PyObject *self, PyObject *other, int op)
     case Py_NE:
         /* By default, __ne__() delegates to __eq__() and inverts the result,
            unless the latter returns NotImplemented. */
-        if (self->ob_type->tp_richcompare == NULL) {
+        if (Py_TYPE(self)->tp_richcompare == NULL) {
             res = Py_NotImplemented;
             Py_INCREF(res);
             break;
         }
-        res = (*self->ob_type->tp_richcompare)(self, other, Py_EQ);
+        res = (*Py_TYPE(self)->tp_richcompare)(self, other, Py_EQ);
         if (res != NULL && res != Py_NotImplemented) {
             int ok = PyObject_IsTrue(res);
             Py_DECREF(res);
@@ -4215,7 +4215,7 @@ _PyObject_GetState(PyObject *obj, int required)
     if (getstate == NULL) {
         PyObject *slotnames;
 
-        if (required && obj->ob_type->tp_itemsize) {
+        if (required && Py_TYPE(obj)->tp_itemsize) {
             PyErr_Format(PyExc_TypeError,
                          "cannot pickle '%.200s' object",
                          Py_TYPE(obj)->tp_name);
@@ -4248,13 +4248,13 @@ _PyObject_GetState(PyObject *obj, int required)
         assert(slotnames == Py_None || PyList_Check(slotnames));
         if (required) {
             Py_ssize_t basicsize = PyBaseObject_Type.tp_basicsize;
-            if (obj->ob_type->tp_dictoffset)
+            if (Py_TYPE(obj)->tp_dictoffset)
                 basicsize += sizeof(PyObject *);
-            if (obj->ob_type->tp_weaklistoffset)
+            if (Py_TYPE(obj)->tp_weaklistoffset)
                 basicsize += sizeof(PyObject *);
             if (slotnames != Py_None)
                 basicsize += sizeof(PyObject *) * PyList_GET_SIZE(slotnames);
-            if (obj->ob_type->tp_basicsize > basicsize) {
+            if (Py_TYPE(obj)->tp_basicsize > basicsize) {
                 Py_DECREF(slotnames);
                 Py_DECREF(state);
                 PyErr_Format(PyExc_TypeError,
@@ -4725,7 +4725,7 @@ object___format___impl(PyObject *self, PyObject *format_spec)
     if (PyUnicode_GET_LENGTH(format_spec) > 0) {
         PyErr_Format(PyExc_TypeError,
                      "unsupported format string passed to %.200s.__format__",
-                     self->ob_type->tp_name);
+                     Py_TYPE(self)->tp_name);
         return NULL;
     }
     return PyObject_Str(self);
@@ -4744,10 +4744,10 @@ object___sizeof___impl(PyObject *self)
     Py_ssize_t res, isize;
 
     res = 0;
-    isize = self->ob_type->tp_itemsize;
+    isize = Py_TYPE(self)->tp_itemsize;
     if (isize > 0)
         res = Py_SIZE(self) * isize;
-    res += self->ob_type->tp_basicsize;
+    res += Py_TYPE(self)->tp_basicsize;
 
     return PyLong_FromSsize_t(res);
 }
@@ -4794,7 +4794,7 @@ object___dir___impl(PyObject *self)
     if (_PyObject_LookupAttrId(self, &PyId___class__, &itsclass) < 0) {
         goto error;
     }
-    /* XXX(tomer): Perhaps fall back to obj->ob_type if no
+    /* XXX(tomer): Perhaps fall back to Py_TYPE(obj) if no
                    __class__ exists? */
     if (itsclass != NULL && merge_class_dict(dict, itsclass) < 0)
         goto error;
@@ -7537,7 +7537,7 @@ set_names(PyTypeObject *type)
                 _PyErr_FormatFromCause(PyExc_RuntimeError,
                     "Error calling __set_name__ on '%.100s' instance %R "
                     "in '%.100s'",
-                    value->ob_type->tp_name, key, type->tp_name);
+                    Py_TYPE(value)->tp_name, key, type->tp_name);
                 Py_DECREF(names_to_set);
                 return -1;
             }

Objects/unicodeobject.c

@@ -8401,7 +8401,7 @@ charmapencode_lookup(Py_UCS4 c, PyObject *mapping)
         /* wrong return value */
         PyErr_Format(PyExc_TypeError,
                      "character mapping must return integer, bytes or None, not %.400s",
-                     x->ob_type->tp_name);
+                     Py_TYPE(x)->tp_name);
         Py_DECREF(x);
         return NULL;
     }
@@ -11082,8 +11082,8 @@ PyUnicode_Compare(PyObject *left, PyObject *right)
     }
     PyErr_Format(PyExc_TypeError,
                  "Can't compare %.100s and %.100s",
-                 left->ob_type->tp_name,
-                 right->ob_type->tp_name);
+                 Py_TYPE(left)->tp_name,
+                 Py_TYPE(right)->tp_name);
     return -1;
 }
 
@@ -11353,7 +11353,7 @@ PyUnicode_Concat(PyObject *left, PyObject *right)
     if (!PyUnicode_Check(right)) {
         PyErr_Format(PyExc_TypeError,
                      "can only concatenate str (not \"%.200s\") to str",
-                     right->ob_type->tp_name);
+                     Py_TYPE(right)->tp_name);
         return NULL;
     }
     if (PyUnicode_READY(right) < 0)