From d7217b79a4e125d4fcc1087743171b94d91d1121 Mon Sep 17 00:00:00 2001 From: Inada Naoki Date: Sat, 14 Jul 2018 00:46:11 +0900 Subject: [PATCH] Use FLAG_REF always for interned strings Upstream-Status: Submitted [https://github.com/python/cpython/pull/8226] Signed-off-by: Joshua Watt --- Python/marshal.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/Python/marshal.c b/Python/marshal.c index 4125240..341c9aa 100644 --- a/Python/marshal.c +++ b/Python/marshal.c @@ -298,9 +298,14 @@ w_ref(PyObject *v, char *flag, WFILE *p) if (p->version < 3 || p->hashtable == NULL) return 0; /* not writing object references */ - /* if it has only one reference, it definitely isn't shared */ - if (Py_REFCNT(v) == 1) + /* If it has only one reference, it definitely isn't shared. + * But we use TYPE_REF always for interned string, to PYC file stable + * as possible. + */ + if (Py_REFCNT(v) == 1 && + !(PyUnicode_CheckExact(v) && PyUnicode_CHECK_INTERNED(v))) { return 0; + } entry = _Py_hashtable_get_entry(p->hashtable, v); if (entry != NULL) {