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Issue #20440: Massive replacing unsafe attribute setting code with special 

macro Py_SETREF.
This commit is contained in:
Serhiy Storchaka 2015-12-24 10:35:59 +02:00
parent a198645fa0
commit 5a57ade58e
28 changed files with 92 additions and 120 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
Include/object.h
View File

@ -846,6 +846,32 @@ PyAPI_FUNC(void) _Py_Dealloc(PyObject *);
Py_DECREF(_py_xdecref_tmp); \
} while (0)
#ifndef Py_LIMITED_API
/* Safely decref `op` and set `op` to `op2`.
*
* As in case of Py_CLEAR "the obvious" code can be deadly:
*
* Py_XDECREF(op);
* op = op2;
*
* The safe way is:
*
* Py_SETREF(op, op2);
*
* That arranges to set `op` to `op2` _before_ decref'ing, so that any code
* triggered as a side-effect of `op` getting torn down no longer believes
* `op` points to a valid object.
*/
#define Py_SETREF(op, op2) \
do { \
PyObject *_py_tmp = (PyObject *)(op); \
(op) = (op2); \
Py_XDECREF(_py_tmp); \
} while (0)
#endif /* ifndef Py_LIMITED_API */
/*
These are provided as conveniences to Python runtime embedders, so that
they can have object code that is not dependent on Python compilation flags.

3
Misc/NEWS
View File

@ -10,6 +10,9 @@ Release date: tba
Core and Builtins
-----------------
- Issue #20440: Massive replacing unsafe attribute setting code with special
macro Py_SETREF.
- Issue #25766: Special method __bytes__() now works in str subclasses.
- Issue #25421: __sizeof__ methods of builtin types now use dynamic basic size.

6
Modules/_csv.c
View File

@ -276,9 +276,8 @@ _set_str(const char *name, PyObject **target, PyObject *src, const char *dflt)
else {
if (PyUnicode_READY(src) == -1)
return -1;
Py_XDECREF(*target);
Py_INCREF(src);
*target = src;
Py_SETREF(*target, src);
}
}
return 0;
@ -784,8 +783,7 @@ parse_process_char(ReaderObj *self, Py_UCS4 c)
static int
parse_reset(ReaderObj *self)
{
Py_XDECREF(self->fields);
self->fields = PyList_New(0);
Py_SETREF(self->fields, PyList_New(0));
if (self->fields == NULL)
return -1;
self->field_len = 0;

41
Modules/_ctypes/_ctypes.c
View File

@ -391,8 +391,7 @@ StructUnionType_new(PyTypeObject *type, PyObject *args, PyObject *kwds, int isSt
Py_DECREF((PyObject *)dict);
return NULL;
}
Py_DECREF(result->tp_dict);
result->tp_dict = (PyObject *)dict;
Py_SETREF(result->tp_dict, (PyObject *)dict);
dict->format = _ctypes_alloc_format_string(NULL, "B");
if (dict->format == NULL) {
Py_DECREF(result);
@ -871,8 +870,7 @@ PyCPointerType_SetProto(StgDictObject *stgdict, PyObject *proto)
return -1;
}
Py_INCREF(proto);
Py_XDECREF(stgdict->proto);
stgdict->proto = proto;
Py_SETREF(stgdict->proto, proto);
return 0;
}
@ -962,8 +960,7 @@ PyCPointerType_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
Py_DECREF((PyObject *)stgdict);
return NULL;
}
Py_DECREF(result->tp_dict);
result->tp_dict = (PyObject *)stgdict;
Py_SETREF(result->tp_dict, (PyObject *)stgdict);
return (PyObject *)result;
}
@ -1406,8 +1403,7 @@ PyCArrayType_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
/* replace the class dict by our updated spam dict */
if (-1 == PyDict_Update((PyObject *)stgdict, result->tp_dict))
goto error;
Py_DECREF(result->tp_dict);
result->tp_dict = (PyObject *)stgdict; /* steal the reference */
Py_SETREF(result->tp_dict, (PyObject *)stgdict); /* steal the reference */
stgdict = NULL;
/* Special case for character arrays.
@ -1820,8 +1816,7 @@ static PyObject *CreateSwappedType(PyTypeObject *type, PyObject *args, PyObject
Py_DECREF((PyObject *)stgdict);
return NULL;
}
Py_DECREF(result->tp_dict);
result->tp_dict = (PyObject *)stgdict;
Py_SETREF(result->tp_dict, (PyObject *)stgdict);
return (PyObject *)result;
}
@ -1949,8 +1944,7 @@ PyCSimpleType_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
Py_DECREF((PyObject *)stgdict);
return NULL;
}
Py_DECREF(result->tp_dict);
result->tp_dict = (PyObject *)stgdict;
Py_SETREF(result->tp_dict, (PyObject *)stgdict);
/* Install from_param class methods in ctypes base classes.
Overrides the PyCSimpleType_from_param generic method.
@ -2313,8 +2307,7 @@ PyCFuncPtrType_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
Py_DECREF((PyObject *)stgdict);
return NULL;
}
Py_DECREF(result->tp_dict);
result->tp_dict = (PyObject *)stgdict;
Py_SETREF(result->tp_dict, (PyObject *)stgdict);
if (-1 == make_funcptrtype_dict(stgdict)) {
Py_DECREF(result);
@ -2458,8 +2451,7 @@ KeepRef(CDataObject *target, Py_ssize_t index, PyObject *keep)
return -1;
}
if (ob->b_objects == NULL || !PyDict_CheckExact(ob->b_objects)) {
Py_XDECREF(ob->b_objects);
ob->b_objects = keep; /* refcount consumed */
Py_SETREF(ob->b_objects, keep); /* refcount consumed */
return 0;
}
key = unique_key(target, index);
@ -2962,9 +2954,8 @@ PyCFuncPtr_set_errcheck(PyCFuncPtrObject *self, PyObject *ob)
"the errcheck attribute must be callable");
return -1;
}
Py_XDECREF(self->errcheck);
Py_XINCREF(ob);
self->errcheck = ob;
Py_SETREF(self->errcheck, ob);
return 0;
}
@ -2993,9 +2984,8 @@ PyCFuncPtr_set_restype(PyCFuncPtrObject *self, PyObject *ob)
return -1;
}
Py_XDECREF(self->checker);
Py_XDECREF(self->restype);
Py_INCREF(ob);
self->restype = ob;
Py_SETREF(self->restype, ob);
self->checker = PyObject_GetAttrString(ob, "_check_retval_");
if (self->checker == NULL)
PyErr_Clear();
@ -3033,11 +3023,9 @@ PyCFuncPtr_set_argtypes(PyCFuncPtrObject *self, PyObject *ob)
converters = converters_from_argtypes(ob);
if (!converters)
return -1;
Py_XDECREF(self->converters);
self->converters = converters;
Py_XDECREF(self->argtypes);
Py_SETREF(self->converters, converters);
Py_INCREF(ob);
self->argtypes = ob;
Py_SETREF(self->argtypes, ob);
}
return 0;
}
@ -5164,9 +5152,8 @@ comerror_init(PyObject *self, PyObject *args, PyObject *kwds)
return -1;
bself = (PyBaseExceptionObject *)self;
Py_DECREF(bself->args);
bself->args = args;
Py_INCREF(bself->args);
Py_INCREF(args);
Py_SETREF(bself->args, args);
return 0;
}

5
Modules/_curses_panel.c
View File

@ -312,9 +312,8 @@ PyCursesPanel_replace_panel(PyCursesPanelObject *self, PyObject *args)
PyErr_SetString(_curses_panelstate_global->PyCursesError, "replace_panel() returned ERR");
return NULL;
}
Py_DECREF(po->wo);
po->wo = temp;
Py_INCREF(po->wo);
Py_INCREF(temp);
Py_SETREF(po->wo, temp);
Py_INCREF(Py_None);
return Py_None;
}

3
Modules/_io/bytesio.c
View File

@ -969,8 +969,7 @@ _io_BytesIO___init___impl(bytesio *self, PyObject *initvalue)
if (initvalue && initvalue != Py_None) {
if (PyBytes_CheckExact(initvalue)) {
Py_INCREF(initvalue);
Py_XDECREF(self->buf);
self->buf = initvalue;
Py_SETREF(self->buf, initvalue);
self->string_size = PyBytes_GET_SIZE(initvalue);
}
else {

13
Modules/_sqlite/connection.c
View File

@ -204,8 +204,8 @@ void pysqlite_flush_statement_cache(pysqlite_Connection* self)
node = node->next;
}
Py_DECREF(self->statement_cache);
self->statement_cache = (pysqlite_Cache*)PyObject_CallFunction((PyObject*)&pysqlite_CacheType, "O", self);
Py_SETREF(self->statement_cache,
(pysqlite_Cache *)PyObject_CallFunction((PyObject *)&pysqlite_CacheType, "O", self));
Py_DECREF(self);
self->statement_cache->decref_factory = 0;
}
@ -318,9 +318,8 @@ PyObject* pysqlite_connection_cursor(pysqlite_Connection* self, PyObject* args,
_pysqlite_drop_unused_cursor_references(self);
if (cursor && self->row_factory != Py_None) {
Py_XDECREF(((pysqlite_Cursor*)cursor)->row_factory);
Py_INCREF(self->row_factory);
((pysqlite_Cursor*)cursor)->row_factory = self->row_factory;
Py_SETREF(((pysqlite_Cursor *)cursor)->row_factory, self->row_factory);
}
return cursor;
@ -795,8 +794,7 @@ static void _pysqlite_drop_unused_statement_references(pysqlite_Connection* self
}
}
Py_DECREF(self->statements);
self->statements = new_list;
Py_SETREF(self->statements, new_list);
}
static void _pysqlite_drop_unused_cursor_references(pysqlite_Connection* self)
@ -827,8 +825,7 @@ static void _pysqlite_drop_unused_cursor_references(pysqlite_Connection* self)
}
}
Py_DECREF(self->cursors);
self->cursors = new_list;
Py_SETREF(self->cursors, new_list);
}
PyObject* pysqlite_connection_create_function(pysqlite_Connection* self, PyObject* args, PyObject* kwargs)

13
Modules/_sqlite/cursor.c
View File

@ -170,8 +170,7 @@ int pysqlite_build_row_cast_map(pysqlite_Cursor* self)
return 0;
}
Py_XDECREF(self->row_cast_map);
self->row_cast_map = PyList_New(0);
Py_SETREF(self->row_cast_map, PyList_New(0));
for (i = 0; i < sqlite3_column_count(self->statement->st); i++) {
converter = NULL;
@ -510,9 +509,8 @@ PyObject* _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject*
goto error;
/* reset description and rowcount */
Py_DECREF(self->description);
Py_INCREF(Py_None);
self->description = Py_None;
Py_SETREF(self->description, Py_None);
self->rowcount = -1L;
func_args = PyTuple_New(1);
@ -537,8 +535,8 @@ PyObject* _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject*
}
if (self->statement->in_use) {
Py_DECREF(self->statement);
self->statement = PyObject_New(pysqlite_Statement, &pysqlite_StatementType);
Py_SETREF(self->statement,
PyObject_New(pysqlite_Statement, &pysqlite_StatementType));
if (!self->statement) {
goto error;
}
@ -654,8 +652,7 @@ PyObject* _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject*
numcols = sqlite3_column_count(self->statement->st);
Py_END_ALLOW_THREADS
Py_DECREF(self->description);
self->description = PyTuple_New(numcols);
Py_SETREF(self->description, PyTuple_New(numcols));
if (!self->description) {
goto error;
}

3
Modules/_sre.c
View File

@ -756,8 +756,7 @@ deepcopy(PyObject** object, PyObject* memo)
if (!copy)
return 0;
Py_DECREF(*object);
*object = copy;
Py_SETREF(*object, copy);
return 1; /* success */
}

6
Modules/_ssl.c
View File

@ -1589,8 +1589,7 @@ static int PySSL_set_context(PySSLSocket *self, PyObject *value,
return -1;
#else
Py_INCREF(value);
Py_DECREF(self->ctx);
self->ctx = (PySSLContext *) value;
Py_SETREF(self->ctx, (PySSLContext *)value);
SSL_set_SSL_CTX(self->ssl, self->ctx->ctx);
#endif
} else {
@ -1647,8 +1646,7 @@ PySSL_get_owner(PySSLSocket *self, void *c)
static int
PySSL_set_owner(PySSLSocket *self, PyObject *value, void *c)
{
Py_XDECREF(self->owner);
self->owner = PyWeakref_NewRef(value, NULL);
Py_SETREF(self->owner, PyWeakref_NewRef(value, NULL));
if (self->owner == NULL)
return -1;
return 0;

9
Modules/faulthandler.c
View File

@ -380,9 +380,8 @@ faulthandler_enable(PyObject *self, PyObject *args, PyObject *kwargs)
if (tstate == NULL)
return NULL;
Py_XDECREF(fatal_error.file);
Py_XINCREF(file);
fatal_error.file = file;
Py_SETREF(fatal_error.file, file);
fatal_error.fd = fd;
fatal_error.all_threads = all_threads;
fatal_error.interp = tstate->interp;
@ -599,9 +598,8 @@ faulthandler_dump_traceback_later(PyObject *self,
/* Cancel previous thread, if running */
cancel_dump_traceback_later();
Py_XDECREF(thread.file);
Py_XINCREF(file);
thread.file = file;
Py_SETREF(thread.file, file);
thread.fd = fd;
thread.timeout_us = timeout_us;
thread.repeat = repeat;
@ -778,9 +776,8 @@ faulthandler_register_py(PyObject *self,
user->previous = previous;
}
Py_XDECREF(user->file);
Py_XINCREF(file);
user->file = file;
Py_SETREF(user->file, file);
user->fd = fd;
user->all_threads = all_threads;
user->chain = chain;

3
Modules/itertoolsmodule.c
View File

@ -636,8 +636,7 @@ tee_next(teeobject *to)
link = teedataobject_jumplink(to->dataobj);
if (link == NULL)
return NULL;
Py_DECREF(to->dataobj);
to->dataobj = (teedataobject *)link;
Py_SETREF(to->dataobj, (teedataobject *)link);
to->index = 0;
}
value = teedataobject_getitem(to->dataobj, to->index);

3
Modules/signalmodule.c
View File

@ -1266,8 +1266,7 @@ PyInit__signal(void)
if (Handlers[SIGINT].func == DefaultHandler) {
/* Install default int handler */
Py_INCREF(IntHandler);
Py_DECREF(Handlers[SIGINT].func);
Handlers[SIGINT].func = IntHandler;
Py_SETREF(Handlers[SIGINT].func, IntHandler);
old_siginthandler = PyOS_setsig(SIGINT, signal_handler);
}

3
Modules/zipimport.c
View File

@ -155,8 +155,7 @@ zipimporter_init(ZipImporter *self, PyObject *args, PyObject *kwds)
tmp = PyUnicode_FromFormat("%U%c", self->prefix, SEP);
if (tmp == NULL)
goto error;
Py_DECREF(self->prefix);
self->prefix = tmp;
Py_SETREF(self->prefix, tmp);
}
}
else

6
Modules/zlibmodule.c
View File

@ -667,8 +667,7 @@ save_unconsumed_input(compobject *self, int err)
PyBytes_AS_STRING(self->unused_data), old_size);
Py_MEMCPY(PyBytes_AS_STRING(new_data) + old_size,
self->zst.next_in, self->zst.avail_in);
Py_DECREF(self->unused_data);
self->unused_data = new_data;
Py_SETREF(self->unused_data, new_data);
self->zst.avail_in = 0;
}
}
@ -680,8 +679,7 @@ save_unconsumed_input(compobject *self, int err)
(char *)self->zst.next_in, self->zst.avail_in);
if (new_data == NULL)
return -1;
Py_DECREF(self->unconsumed_tail);
self->unconsumed_tail = new_data;
Py_SETREF(self->unconsumed_tail, new_data);
}
return 0;
}

3
Objects/bytesobject.c
View File

@ -3520,8 +3520,7 @@ PyBytes_Concat(PyObject **pv, PyObject *w)
/* Multiple references, need to create new object */
PyObject *v;
v = bytes_concat(*pv, w);
Py_DECREF(*pv);
*pv = v;
Py_SETREF(*pv, v);
}
}

3
Objects/descrobject.c
View File

@ -1509,8 +1509,7 @@ property_init(PyObject *self, PyObject *args, PyObject *kwds)
PyObject *get_doc = _PyObject_GetAttrId(get, &PyId___doc__);
if (get_doc) {
if (Py_TYPE(self) == &PyProperty_Type) {
Py_XDECREF(prop->prop_doc);
prop->prop_doc = get_doc;
Py_SETREF(prop->prop_doc, get_doc);
}
else {
/* If this is a property subclass, put __doc__

3
Objects/exceptions.c
View File

@ -236,8 +236,7 @@ BaseException_set_tb(PyBaseExceptionObject *self, PyObject *tb)
}
Py_XINCREF(tb);
Py_XDECREF(self->traceback);
self->traceback = tb;
Py_SETREF(self->traceback, tb);
return 0;
}

3
Objects/frameobject.c
View File

@ -857,8 +857,7 @@ dict_to_map(PyObject *map, Py_ssize_t nmap, PyObject *dict, PyObject **values,
}
} else if (values[j] != value) {
Py_XINCREF(value);
Py_XDECREF(values[j]);
values[j] = value;
Py_SETREF(values[j], value);
}
Py_XDECREF(value);
}

15
Objects/funcobject.c
View File

@ -127,8 +127,7 @@ PyFunction_SetDefaults(PyObject *op, PyObject *defaults)
PyErr_SetString(PyExc_SystemError, "non-tuple default args");
return -1;
}
Py_XDECREF(((PyFunctionObject *) op) -> func_defaults);
((PyFunctionObject *) op) -> func_defaults = defaults;
Py_SETREF(((PyFunctionObject *)op)->func_defaults, defaults);
return 0;
}
@ -159,8 +158,7 @@ PyFunction_SetKwDefaults(PyObject *op, PyObject *defaults)
"non-dict keyword only default args");
return -1;
}
Py_XDECREF(((PyFunctionObject *)op) -> func_kwdefaults);
((PyFunctionObject *) op) -> func_kwdefaults = defaults;
Py_SETREF(((PyFunctionObject *)op)->func_kwdefaults, defaults);
return 0;
}
@ -192,8 +190,7 @@ PyFunction_SetClosure(PyObject *op, PyObject *closure)
closure->ob_type->tp_name);
return -1;
}
Py_XDECREF(((PyFunctionObject *) op) -> func_closure);
((PyFunctionObject *) op) -> func_closure = closure;
Py_SETREF(((PyFunctionObject *)op)->func_closure, closure);
return 0;
}
@ -224,8 +221,7 @@ PyFunction_SetAnnotations(PyObject *op, PyObject *annotations)
"non-dict annotations");
return -1;
}
Py_XDECREF(((PyFunctionObject *)op) -> func_annotations);
((PyFunctionObject *) op) -> func_annotations = annotations;
Py_SETREF(((PyFunctionObject *)op)->func_annotations, annotations);
return 0;
}
@ -531,8 +527,7 @@ func_new(PyTypeObject* type, PyObject* args, PyObject* kw)
if (name != Py_None) {
Py_INCREF(name);
Py_DECREF(newfunc->func_name);
newfunc->func_name = name;
Py_SETREF(newfunc->func_name, name);
}
if (defaults != Py_None) {
Py_INCREF(defaults);

3
Objects/moduleobject.c
View File

@ -69,8 +69,7 @@ module_init_dict(PyModuleObject *mod, PyObject *md_dict,
return -1;
if (PyUnicode_CheckExact(name)) {
Py_INCREF(name);
Py_XDECREF(mod->md_name);
mod->md_name = name;
Py_SETREF(mod->md_name, name);
}
return 0;

3
Objects/rangeobject.c
View File

@ -1066,8 +1066,7 @@ longrangeiter_next(longrangeiterobject *r)
result = PyNumber_Add(r->start, product);
Py_DECREF(product);
if (result) {
Py_DECREF(r->index);
r->index = new_index;
Py_SETREF(r->index, new_index);
}
else {
Py_DECREF(new_index);

9
Objects/typeobject.c
View File

@ -315,9 +315,8 @@ assign_version_tag(PyTypeObject *type)
are borrowed reference */
for (i = 0; i < (1 << MCACHE_SIZE_EXP); i++) {
method_cache[i].value = NULL;
Py_XDECREF(method_cache[i].name);
method_cache[i].name = Py_None;
Py_INCREF(Py_None);
Py_SETREF(method_cache[i].name, Py_None);
}
/* mark all version tags as invalid */
PyType_Modified(&PyBaseObject_Type);
@ -462,8 +461,7 @@ type_set_qualname(PyTypeObject *type, PyObject *value, void *context)
et = (PyHeapTypeObject*)type;
Py_INCREF(value);
Py_DECREF(et->ht_qualname);
et->ht_qualname = value;
Py_SETREF(et->ht_qualname, value);
return 0;
}
@ -2910,8 +2908,7 @@ _PyType_Lookup(PyTypeObject *type, PyObject *name)
else
method_cache_misses++;
#endif
Py_DECREF(method_cache[h].name);
method_cache[h].name = name;
Py_SETREF(method_cache[h].name, name);
}
return res;
}

12
Objects/unicodeobject.c
View File

@ -1665,8 +1665,7 @@ unicode_resize(PyObject **p_unicode, Py_ssize_t length)
_Py_INCREF_UNICODE_EMPTY();
if (!unicode_empty)
return -1;
Py_DECREF(*p_unicode);
*p_unicode = unicode_empty;
Py_SETREF(*p_unicode, unicode_empty);
return 0;
}
@ -1674,8 +1673,7 @@ unicode_resize(PyObject **p_unicode, Py_ssize_t length)
PyObject *copy = resize_copy(unicode, length);
if (copy == NULL)
return -1;
Py_DECREF(*p_unicode);
*p_unicode = copy;
Py_SETREF(*p_unicode, copy);
return 0;
}
@ -13322,8 +13320,7 @@ _PyUnicodeWriter_PrepareInternal(_PyUnicodeWriter *writer,
return -1;
_PyUnicode_FastCopyCharacters(newbuffer, 0,
writer->buffer, 0, writer->pos);
Py_DECREF(writer->buffer);
writer->buffer = newbuffer;
Py_SETREF(writer->buffer, newbuffer);
}
_PyUnicodeWriter_Update(writer);
return 0;
@ -15009,8 +15006,7 @@ PyUnicode_InternInPlace(PyObject **p)
if (t) {
Py_INCREF(t);
Py_DECREF(*p);
*p = t;
Py_SETREF(*p, t);
return;
}

3
Parser/tokenizer.c
View File

@ -524,9 +524,8 @@ fp_setreadl(struct tok_state *tok, const char* enc)
if (stream == NULL)
goto cleanup;
Py_XDECREF(tok->decoding_readline);
readline = _PyObject_GetAttrId(stream, &PyId_readline);
tok->decoding_readline = readline;
Py_SETREF(tok->decoding_readline, readline);
if (pos > 0) {
if (PyObject_CallObject(readline, NULL) == NULL) {
readline = NULL;

3
Python/_warnings.c
View File

@ -680,8 +680,7 @@ setup_context(Py_ssize_t stack_level, PyObject **filename, int *lineno,
goto handle_error;
}
else if (!is_true) {
Py_DECREF(*filename);
*filename = PyUnicode_FromString("__main__");
Py_SETREF(*filename, PyUnicode_FromString("__main__"));
if (*filename == NULL)
goto handle_error;
}

6
Python/ceval.c
View File

@ -3214,8 +3214,7 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
Py_INCREF(self);
func = PyMethod_GET_FUNCTION(func);
Py_INCREF(func);
Py_DECREF(*pfunc);
*pfunc = self;
Py_SETREF(*pfunc, self);
na++;
/* n++; */
} else
@ -4670,8 +4669,7 @@ call_function(PyObject ***pp_stack, int oparg
Py_INCREF(self);
func = PyMethod_GET_FUNCTION(func);
Py_INCREF(func);
Py_DECREF(*pfunc);
*pfunc = self;
Py_SETREF(*pfunc, self);
na++;
n++;
} else

3
Python/compile.c
View File

@ -1795,8 +1795,7 @@ compiler_class(struct compiler *c, stmt_ty s)
{
/* use the class name for name mangling */
Py_INCREF(s->v.ClassDef.name);
Py_XDECREF(c->u->u_private);
c->u->u_private = s->v.ClassDef.name;
Py_SETREF(c->u->u_private, s->v.ClassDef.name);
/* load (global) __name__ ... */
str = PyUnicode_InternFromString("__name__");
if (!str || !compiler_nameop(c, str, Load)) {