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bpo-42972: Fully implement GC protocol for sqlite3 heap types #26104

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Merged
pablogsal merged 14 commits into from
May 25, 2021
Merged

bpo-42972: Fully implement GC protocol for sqlite3 heap types #26104

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6ece632
sqlite.Connection type now implements GC protocol
Jan 20, 2021
8660609
sqlite.Cursor type now implements GC protocol
Jan 20, 2021
13bc519
sqlite.Row type now implements GC protocol
Jan 20, 2021
4519017
sqlite.PrepareProtocol type now implements GC protocol
Jan 20, 2021
20da088
sqlite.Statement type now implements GC protocol
Jan 20, 2021
ca870ac
sqlite3.Cache and sqlite3.Node types now implements GC protocol
Jan 20, 2021
f5d9873
Remove unneeded self->db = NULL
May 13, 2021
34928ed
Get rid of unneeded cast in cursor_dealloc
May 13, 2021
590ff8e
Address review: visit node->key, node->data, and con->isolation_level
May 23, 2021
b080ff7
Harden cache clear
May 24, 2021
2bcfa29
Normalize connection_dealloc naming
May 24, 2021
f8eb733
Address review: visit row PyObjects for consistency
May 25, 2021
ab4c6e6
Normalize statement dealloc naming
May 25, 2021
926787d
Clear sqlite3 stmt resources in stmt_clear()
May 25, 2021
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sqlite3.Cache and sqlite3.Node types now implements GC protocol
  • Loading branch information
Erlend E. Aasland committed May 13, 2021
commit ca870ac061d15c98b365279e8faec8b0cd8633cf
80 changes: 57 additions & 23 deletions Modules/_sqlite/cache.c
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Original file line number Diff line number Diff line change
Expand Up @@ -44,14 +44,27 @@ pysqlite_new_node(PyObject *key, PyObject *data)
return node;
}

static int
node_traverse(pysqlite_Node *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
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erlend-aasland marked this conversation as resolved.
return 0;
}

static int
node_clear(pysqlite_Node *self)
{
Py_CLEAR(self->key);
Py_CLEAR(self->data);
return 0;
}

static void
pysqlite_node_dealloc(pysqlite_Node *self)
{
PyTypeObject *tp = Py_TYPE(self);

Py_DECREF(self->key);
Py_DECREF(self->data);

PyObject_GC_UnTrack(self);
tp->tp_clear((PyObject *)self);
tp->tp_free(self);
Py_DECREF(tp);
}
Expand Down Expand Up @@ -88,31 +101,50 @@ pysqlite_cache_init(pysqlite_Cache *self, PyObject *args, PyObject *kwargs)
return 0;
}

static void
pysqlite_cache_dealloc(pysqlite_Cache *self)
static int
cache_traverse(pysqlite_Cache *self, visitproc visit, void *arg)
{
PyTypeObject *tp = Py_TYPE(self);
pysqlite_Node* node;
pysqlite_Node* delete_node;

if (!self->factory) {
/* constructor failed, just get out of here */
return;
pysqlite_Node *node = self->first;
while (node) {
Py_VISIT(node);
node = node->next;
}
Py_VISIT(self->mapping);
if (self->decref_factory) {
Py_VISIT(self->factory);
}
Py_VISIT(Py_TYPE(self));
return 0;
}

static int
cache_clear(pysqlite_Cache *self)
{
/* iterate over all nodes and deallocate them */
node = self->first;
pysqlite_Node *node = self->first;
while (node) {
delete_node = node;
pysqlite_Node *delete_node = node;
node = node->next;
Py_DECREF(delete_node);
Py_CLEAR(delete_node);
}

if (self->decref_factory) {
Py_DECREF(self->factory);
Py_CLEAR(self->factory);
}
Py_CLEAR(self->mapping);
return 0;
}

static void
pysqlite_cache_dealloc(pysqlite_Cache *self)
{
if (!self->factory) {
/* constructor failed, just get out of here */
return;
}
Py_DECREF(self->mapping);

PyObject_GC_UnTrack(self);
PyTypeObject *tp = Py_TYPE(self);
tp->tp_clear((PyObject *)self);
tp->tp_free(self);
Py_DECREF(tp);
}
Expand Down Expand Up @@ -260,14 +292,15 @@ pysqlite_cache_display(pysqlite_Cache *self, PyObject *args)

static PyType_Slot node_slots[] = {
{Py_tp_dealloc, pysqlite_node_dealloc},
{Py_tp_new, PyType_GenericNew},
{Py_tp_traverse, node_traverse},
{Py_tp_clear, node_clear},
{0, NULL},
};

static PyType_Spec node_spec = {
.name = MODULE_NAME ".Node",
.basicsize = sizeof(pysqlite_Node),
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
.slots = node_slots,
};
PyTypeObject *pysqlite_NodeType = NULL;
Expand All @@ -283,15 +316,16 @@ static PyMethodDef cache_methods[] = {
static PyType_Slot cache_slots[] = {
{Py_tp_dealloc, pysqlite_cache_dealloc},
{Py_tp_methods, cache_methods},
{Py_tp_new, PyType_GenericNew},
{Py_tp_init, pysqlite_cache_init},
{Py_tp_traverse, cache_traverse},
{Py_tp_clear, cache_clear},
{0, NULL},
};

static PyType_Spec cache_spec = {
.name = MODULE_NAME ".Cache",
.basicsize = sizeof(pysqlite_Cache),
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
.slots = cache_slots,
};
PyTypeObject *pysqlite_CacheType = NULL;
Expand Down