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bpo-41861: Convert sqlite3 cache and node types to heap types by erlend-aasland · Pull Request #22417 · python/cpython · GitHub
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bpo-41861: Convert sqlite3 cache and node types to heap types #22417

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Merged
vstinner merged 8 commits into from
Sep 27, 2020
+48 −99
Merged

bpo-41861: Convert sqlite3 cache and node types to heap types #22417

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b3af287
Convert CacheType to heap type
Sep 8, 2020
c3cedc5
Convert NodeType to heap type
Sep 8, 2020
a3e33bd
Add NEWS entry
Sep 26, 2020
f1568b1
Revert "Add NEWS entry"
Sep 26, 2020
cdb6e4c
Use PyType_FromModuleAndSpec iso. PyType_FromSpec
Sep 26, 2020
6be8abc
Improve dealloc
Sep 26, 2020
fad7260
Fix dealloc for cache type as well
Sep 26, 2020
e8be010
Make node type spec static
Sep 26, 2020
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2020-09-26-12-16-28.bpo-41861.3xTsIp.rst
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@@ -0,0 +1 @@
Covert :mod:`sqlite3` Cache and Node types to heap types (PEP 384).
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128 changes: 37 additions & 91 deletions Modules/_sqlite/cache.c
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Expand Up @@ -29,7 +29,7 @@ pysqlite_Node* pysqlite_new_node(PyObject* key, PyObject* data)
{
pysqlite_Node* node;

node = (pysqlite_Node*) (pysqlite_NodeType.tp_alloc(&pysqlite_NodeType, 0));
node = (pysqlite_Node*) (pysqlite_NodeType->tp_alloc(pysqlite_NodeType, 0));
if (!node) {
return NULL;
}
Expand All @@ -52,6 +52,7 @@ void pysqlite_node_dealloc(pysqlite_Node* self)
Py_DECREF(self->data);

Py_TYPE(self)->tp_free((PyObject*)self);
Py_DECREF(pysqlite_NodeType);
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}

int pysqlite_cache_init(pysqlite_Cache* self, PyObject* args, PyObject* kwargs)
Expand Down Expand Up @@ -110,6 +111,7 @@ void pysqlite_cache_dealloc(pysqlite_Cache* self)
Py_DECREF(self->mapping);

Py_TYPE(self)->tp_free((PyObject*)self);
Py_DECREF(pysqlite_CacheType);
}

PyObject* pysqlite_cache_get(pysqlite_Cache* self, PyObject* key)
Expand Down Expand Up @@ -253,6 +255,20 @@ PyObject* pysqlite_cache_display(pysqlite_Cache* self, PyObject* args)
Py_RETURN_NONE;
}

static PyType_Slot pysqlite_NodeType_slots[] = {
{Py_tp_dealloc, pysqlite_node_dealloc},
{Py_tp_new, PyType_GenericNew},
{0, NULL},
};

PyType_Spec pysqlite_NodeType_spec = {
.name = MODULE_NAME ".Node",
.basicsize = sizeof(pysqlite_Node),
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE,
.slots = pysqlite_NodeType_slots,
};
PyTypeObject *pysqlite_NodeType = NULL;

static PyMethodDef cache_methods[] = {
{"get", (PyCFunction)pysqlite_cache_get, METH_O,
PyDoc_STR("Gets an entry from the cache or calls the factory function to produce one.")},
Expand All @@ -261,102 +277,32 @@ static PyMethodDef cache_methods[] = {
{NULL, NULL}
};

PyTypeObject pysqlite_NodeType = {
PyVarObject_HEAD_INIT(NULL, 0)
MODULE_NAME "Node", /* tp_name */
sizeof(pysqlite_Node), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)pysqlite_node_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0 /* tp_free */
static PyType_Slot pysqlite_CacheType_slots[] = {
{Py_tp_dealloc, pysqlite_cache_dealloc},
{Py_tp_methods, cache_methods},
{Py_tp_new, PyType_GenericNew},
{Py_tp_init, pysqlite_cache_init},
{0, NULL},
};

PyTypeObject pysqlite_CacheType = {
PyVarObject_HEAD_INIT(NULL, 0)
MODULE_NAME ".Cache", /* tp_name */
sizeof(pysqlite_Cache), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)pysqlite_cache_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
cache_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)pysqlite_cache_init, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0 /* tp_free */
static PyType_Spec pysqlite_CacheType_spec = {
.name = MODULE_NAME ".Cache",
.basicsize = sizeof(pysqlite_Cache),
.flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HEAPTYPE,
.slots = pysqlite_CacheType_slots,
};
PyTypeObject *pysqlite_CacheType = NULL;

extern int pysqlite_cache_setup_types(void)
{
int rc;

pysqlite_NodeType.tp_new = PyType_GenericNew;
pysqlite_CacheType.tp_new = PyType_GenericNew;

rc = PyType_Ready(&pysqlite_NodeType);
if (rc < 0) {
return rc;
pysqlite_NodeType = (PyTypeObject *)PyType_FromSpec(&pysqlite_NodeType_spec);
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if (pysqlite_NodeType == NULL) {
return -1;
}

rc = PyType_Ready(&pysqlite_CacheType);
return rc;
pysqlite_CacheType = (PyTypeObject *)PyType_FromSpec(&pysqlite_CacheType_spec);
if (pysqlite_CacheType == NULL) {
return -1;
}
return 0;
}
4 changes: 2 additions & 2 deletions Modules/_sqlite/cache.h
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Expand Up @@ -59,8 +59,8 @@ typedef struct
int decref_factory;
} pysqlite_Cache;

extern PyTypeObject pysqlite_NodeType;
extern PyTypeObject pysqlite_CacheType;
extern PyTypeObject *pysqlite_NodeType;
extern PyTypeObject *pysqlite_CacheType;

int pysqlite_node_init(pysqlite_Node* self, PyObject* args, PyObject* kwargs);
void pysqlite_node_dealloc(pysqlite_Node* self);
Expand Down
2 changes: 1 addition & 1 deletion Modules/_sqlite/connection.c
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Expand Up @@ -133,7 +133,7 @@ int pysqlite_connection_init(pysqlite_Connection* self, PyObject* args, PyObject
}
Py_DECREF(isolation_level);

self->statement_cache = (pysqlite_Cache*)PyObject_CallFunction((PyObject*)&pysqlite_CacheType, "Oi", self, cached_statements);
self->statement_cache = (pysqlite_Cache*)PyObject_CallFunction((PyObject*)pysqlite_CacheType, "Oi", self, cached_statements);
if (PyErr_Occurred()) {
return -1;
}
Expand Down