A small change to the C API for weakly-referencable types: Such types
must now initialize the extra field used by the weak-ref machinery to
NULL themselves, to avoid having to require PyObject_INIT() to check
if the type supports weak references and do it there. This causes less
work to be done for all objects (the type object does not need to be
consulted to check for the Py_TPFLAGS_HAVE_WEAKREFS bit).
diff --git a/Include/objimpl.h b/Include/objimpl.h
index 4197bde..4aa38d5 100644
--- a/Include/objimpl.h
+++ b/Include/objimpl.h
@@ -167,11 +167,7 @@
/* Macros trading binary compatibility for speed. See also pymem.h.
Note that these macros expect non-NULL object pointers.*/
#define PyObject_INIT(op, typeobj) \
- ((op)->ob_type = (typeobj), _Py_NewReference((PyObject *)(op)), \
- (PyType_SUPPORTS_WEAKREFS((typeobj)) \
- ? *(PyObject_GET_WEAKREFS_LISTPTR(op)) = NULL \
- : NULL), \
- (op))
+ ( (op)->ob_type = (typeobj), _Py_NewReference((PyObject *)(op)), (op) )
#define PyObject_INIT_VAR(op, typeobj, size) \
( (op)->ob_size = (size), PyObject_INIT((op), (typeobj)) )