commit 5951f2300f43d75d344d542e171daed47a0382a6
author Serhiy Storchaka <storchaka@gmail.com> Thu Dec 24 10:35:35 2015 +0200
committer Serhiy Storchaka <storchaka@gmail.com> Thu Dec 24 10:35:35 2015 +0200
tree 2e173dda0c0d4c4bf887e8a6a309430d0d9cd5be
parent 6ed42ea08b3a961944e94f1dd941ffabc7657065

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

Objects/stringobject.c

diff --git a/Objects/stringobject.c b/Objects/stringobject.c
index 14c5177..f585ffc 100644
--- a/Objects/stringobject.c
+++ b/Objects/stringobject.c
@@ -3865,8 +3865,7 @@
         return;
     }
     v = string_concat((PyStringObject *) *pv, w);
-    Py_DECREF(*pv);
-    *pv = v;
+    Py_SETREF(*pv, v);
 }
 
 void
@@ -4751,8 +4750,7 @@
     t = PyDict_GetItem(interned, (PyObject *)s);
     if (t) {
         Py_INCREF(t);
-        Py_DECREF(*p);
-        *p = t;
+        Py_SETREF(*p, t);
         return;
     }