8000 gh-94207: Fix struct module leak by mdickinson · Pull Request #94239 · python/cpython · GitHub
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gh-94207: Fix struct module leak #94239

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Merged
merged 3 commits into from
Jun 25, 2022
Merged

gh-94207: Fix struct module leak #94239

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cc930e1
Make _struct.Struct a GC type
mdickinson Jun 24, 2022
3f89dc7
Add a regression test
mdickinson Jun 24, 2022
9d41bae
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mdickinson Jun 24, 2022
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Make _struct.Struct a GC type 
This fixes a memory leak in the _struct module, where as soon
as a Struct object is stored in the cache, there's a cycle from
the _struct module to the cache to Struct objects to the Struct
type back to the module. If _struct.Struct is not gc-tracked, that
cycle is never collected.
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@mdickinson
mdickinson committed Jun 24, 2022
commit cc930e1945545b1ba47bd2bae473eeb8c2fe0e32
22 changes: 20 additions & 2 deletions Modules/_struct.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1496,10 +1496,26 @@ Struct___init___impl(PyStructObject *self, PyObject *format)
return ret;
}

static int
s_clear(PyStructObject *s)
{
Py_CLEAR(s->s_format);
return 0;
}

static int
s_traverse(PyStructObject *s, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(s));
Py_VISIT(s->s_format);
return 0;
}

static void
s_dealloc(PyStructObject *s)
{
PyTypeObject *tp = Py_TYPE(s);
PyObject_GC_UnTrack(s);
if (s->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *)s);
if (s->s_codes != NULL) {
Expand Down Expand Up @@ -2078,21 +2094,23 @@ static PyType_Slot PyStructType_slots[] = {
{Py_tp_getattro, PyObject_GenericGetAttr},
{Py_tp_setattro, PyObject_GenericSetAttr},
{Py_tp_doc, (void*)s__doc__},
{Py_tp_traverse, s_traverse},
{Py_tp_clear, s_clear},
{Py_tp_methods, s_methods},
{Py_tp_members, s_members},
{Py_tp_getset, s_getsetlist},
{Py_tp_init, Struct___init__},
{Py_tp_alloc, PyType_GenericAlloc},
{Py_tp_new, s_new},
{Py_tp_free, PyObject_Del},
{Py_tp_free, PyObject_GC_Del},
{0, 0},
};

static PyType_Spec PyStructType_spec = {
"_struct.Struct",
sizeof(PyStructObject),
0,
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE,
PyStructType_slots
};

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0