commit c06a6d0958e2eb4449605069b9c10d656ab756e8
author Serhiy Storchaka <storchaka@gmail.com> Sat Dec 19 20:07:48 2015 +0200
committer Serhiy Storchaka <storchaka@gmail.com> Sat Dec 19 20:07:48 2015 +0200
tree 3be097cf344ed6c277ca77bd37f253f5c66d3a7d
parent 6f3d5da36cb6f7a7472c69f92de16682e5a82620

Issue #25421: __sizeof__ methods of builtin types now use dynamic basic size.
This allows sys.getsize() to work correctly with their subclasses with
__slots__ defined.

Modules/_io/bufferedio.c

diff --git a/Modules/_io/bufferedio.c b/Modules/_io/bufferedio.c
index b4632ed..dd518d7 100644
--- a/Modules/_io/bufferedio.c
+++ b/Modules/_io/bufferedio.c
@@ -391,7 +391,7 @@
 {
     Py_ssize_t res;
 
-    res = sizeof(buffered);
+    res = _PyObject_SIZE(Py_TYPE(self));
     if (self->buffer)
         res += self->buffer_size;
     return PyLong_FromSsize_t(res);

Modules/_io/bytesio.c

diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index f643e91..82f3851 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -809,7 +809,7 @@
 {
     Py_ssize_t res;
 
-    res = sizeof(bytesio);
+    res = _PyObject_SIZE(Py_TYPE(self));
     if (self->buf)
         res += self->buf_size;
     return PyLong_FromSsize_t(res);