commit a370fcf3b2211242c888558237557eb4895391d0
author Antoine Pitrou <solipsis@pitrou.net> Sat Aug 20 14:15:03 2011 +0200
committer Antoine Pitrou <solipsis@pitrou.net> Sat Aug 20 14:15:03 2011 +0200
tree 4c52a9237332bc7b3e1e9d0eba8e84c878acd210
parent 0c17d0d96e9684e29a731227452355da79b14b5b

Issue #12791: Break reference cycles early when a generator exits with an exception.

Objects/genobject.c

diff --git a/Objects/genobject.c b/Objects/genobject.c
index 3fa1b4e..01cd44a 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -100,6 +100,17 @@
 
     if (!result || f->f_stacktop == NULL) {
         /* generator can't be rerun, so release the frame */
+        /* first clean reference cycle through stored exception traceback */
+        PyObject *t, *v, *tb;
+        t = f->f_exc_type;
+        v = f->f_exc_value;
+        tb = f->f_exc_traceback;
+        f->f_exc_type = NULL;
+        f->f_exc_value = NULL;
+        f->f_exc_traceback = NULL;
+        Py_XDECREF(t);
+        Py_XDECREF(v);
+        Py_XDECREF(tb);
         Py_DECREF(f);
         gen->gi_frame = NULL;
     }