bpo-40052: Fix alignment issue in PyVectorcall_Function() (GH-23999)
```
In file included from /usr/include/python3.8/Python.h:147:
In file included from /usr/include/python3.8/abstract.h:837:
/usr/include/python3.8/cpython/abstract.h:91:11: error: cast from 'char *' to 'vectorcallfunc *'
(aka 'struct _object *(**)(struct _object *, struct _object *const *, unsigned long, struct _object *)')
increases required alignment from 1 to 8 [-Werror,-Wcast-align]
ptr = (vectorcallfunc*)(((char *)callable) + offset);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
```
Co-Authored-By: Andreas Schneider <asn@cryptomilk.org>
Co-Authored-By: Antoine Pitrou <antoine@python.org>diff --git a/Include/cpython/abstract.h b/Include/cpython/abstract.h
index b5b6e48..1083942 100644
--- a/Include/cpython/abstract.h
+++ b/Include/cpython/abstract.h
@@ -63,7 +63,7 @@ PyVectorcall_Function(PyObject *callable)
{
PyTypeObject *tp;
Py_ssize_t offset;
- vectorcallfunc *ptr;
+ vectorcallfunc ptr;
assert(callable != NULL);
tp = Py_TYPE(callable);
@@ -73,8 +73,8 @@ PyVectorcall_Function(PyObject *callable)
assert(PyCallable_Check(callable));
offset = tp->tp_vectorcall_offset;
assert(offset > 0);
- ptr = (vectorcallfunc *)(((char *)callable) + offset);
- return *ptr;
+ memcpy(&ptr, (char *) callable + offset, sizeof(ptr));
+ return ptr;
}
/* Call the callable object 'callable' with the "vectorcall" calling