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pythongh-105927: Refactor weakrefobject.c
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* proxy_checkref() now checks the object, not the proxy.
* Most functions take PyObject* instead of PyWeakReference*.
* Remove redundant calls to PyWeakref_GET_OBJECT().
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@vstinner
vstinner committed Jun 19, 2023
1 parent 1858db7 commit 1e9d9c2
Showing 1 changed file with 56 additions and 60 deletions.
116 changes: 56 additions & 60 deletions Objects/weakrefobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ _PyWeakref_GetWeakrefCount(PyWeakReference *head)
return count;
}

static PyObject *weakref_vectorcall(PyWeakReference *self, PyObject *const *args, size_t nargsf, PyObject *kwnames);
static PyObject *weakref_vectorcall(PyObject *self, PyObject *const *args, size_t nargsf, PyObject *kwnames);

static void
init_weakref(PyWeakReference *self, PyObject *ob, PyObject *callback)
Expand All @@ -29,7 +29,7 @@ init_weakref(PyWeakReference *self, PyObject *ob, PyObject *callback)
self->wr_prev = NULL;
self->wr_next = NULL;
self->wr_callback = Py_XNewRef(callback);
self->vectorcall = (vectorcallfunc)weakref_vectorcall;
self->vectorcall = weakref_vectorcall;
}

static PyWeakReference *
Expand Down Expand Up @@ -129,7 +129,7 @@ gc_clear(PyWeakReference *self)


static PyObject *
weakref_vectorcall(PyWeakReference *self, PyObject *const *args,
weakref_vectorcall(PyObject *self, PyObject *const *args,
size_t nargsf, PyObject *kwnames)
{
if (!_PyArg_NoKwnames("weakref", kwnames)) {
Expand Down Expand Up @@ -160,7 +160,7 @@ weakref_hash(PyWeakReference *self)


static PyObject *
weakref_repr(PyWeakReference *self)
weakref_repr(PyObject *self)
{
PyObject *name, *repr;
PyObject* obj = PyWeakref_GET_OBJECT(self);
Expand All @@ -174,17 +174,12 @@ weakref_repr(PyWeakReference *self)
if (name == NULL || !PyUnicode_Check(name)) {
repr = PyUnicode_FromFormat(
"<weakref at %p; to '%s' at %p>",
self,
Py_TYPE(PyWeakref_GET_OBJECT(self))->tp_name,
obj);
self, Py_TYPE(obj)->tp_name, obj);
}
else {
repr = PyUnicode_FromFormat(
"<weakref at %p; to '%s' at %p (%U)>",
self,
Py_TYPE(PyWeakref_GET_OBJECT(self))->tp_name,
obj,
name);
self, Py_TYPE(obj)->tp_name, obj, name);
}
Py_DECREF(obj);
Py_XDECREF(name);
Expand All @@ -203,8 +198,9 @@ weakref_richcompare(PyWeakReference* self, PyWeakReference* other, int op)
!PyWeakref_Check(other)) {
Py_RETURN_NOTIMPLEMENTED;
}
if (PyWeakref_GET_OBJECT(self) == Py_None
|| PyWeakref_GET_OBJECT(other) == Py_None) {
PyObject* obj = PyWeakref_GET_OBJECT(self);
PyObject* other_obj = PyWeakref_GET_OBJECT(other);
if (obj == Py_None || other_obj == Py_None) {
int res = (self == other);
if (op == Py_NE)
res = !res;
Expand All @@ -213,8 +209,6 @@ weakref_richcompare(PyWeakReference* self, PyWeakReference* other, int op)
else
Py_RETURN_FALSE;
}
PyObject* obj = PyWeakref_GET_OBJECT(self);
PyObject* other_obj = PyWeakref_GET_OBJECT(other);
Py_INCREF(obj);
Py_INCREF(other_obj);
PyObject* res = PyObject_RichCompare(obj, other_obj, op);
Expand Down Expand Up @@ -372,7 +366,7 @@ _PyWeakref_RefType = {
.tp_dealloc = weakref_dealloc,
.tp_vectorcall_offset = offsetof(PyWeakReference, vectorcall),
.tp_call = PyVectorcall_Call,
.tp_repr = (reprfunc)weakref_repr,
.tp_repr = weakref_repr,
.tp_hash = (hashfunc)weakref_hash,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_HAVE_VECTORCALL | Py_TPFLAGS_BASETYPE,
Expand All @@ -388,15 +382,15 @@ _PyWeakref_RefType = {
};


static int
proxy_checkref(PyWeakReference *proxy)
static bool
proxy_checkref(PyObject *obj)
{
if (PyWeakref_GET_OBJECT(proxy) == Py_None) {
if (obj == Py_None) {
PyErr_SetString(PyExc_ReferenceError,
"weakly-referenced object no longer exists");
return 0;
return false;
}
return 1;
return true;
}


Expand All @@ -406,9 +400,9 @@ proxy_checkref(PyWeakReference *proxy)
*/
#define UNWRAP(o) \
if (PyWeakref_CheckProxy(o)) { \
if (!proxy_checkref((PyWeakReference *)o)) \
return NULL; \
o = PyWeakref_GET_OBJECT(o); \
if (!proxy_checkref(o)) \
return NULL; \
}

#define WRAP_UNARY(method, generic) \
Expand Down Expand Up @@ -483,11 +477,12 @@ proxy_repr(PyWeakReference *proxy)


static int
proxy_setattr(PyWeakReference *proxy, PyObject *name, PyObject *value)
proxy_setattr(PyObject *proxy, PyObject *name, PyObject *value)
{
if (!proxy_checkref(proxy))
return -1;
PyObject *obj = PyWeakref_GET_OBJECT(proxy);
if (!proxy_checkref(obj)) {
return -1;
}
Py_INCREF(obj);
int res = PyObject_SetAttr(obj, name, value);
Py_DECREF(obj);
Expand Down Expand Up @@ -539,10 +534,10 @@ WRAP_BINARY(proxy_matmul, PyNumber_MatrixMultiply)
WRAP_BINARY(proxy_imatmul, PyNumber_InPlaceMatrixMultiply)

static int
proxy_bool(PyWeakReference *proxy)
proxy_bool(PyObject *proxy)
{
PyObject *o = PyWeakref_GET_OBJECT(proxy);
if (!proxy_checkref(proxy)) {
if (!proxy_checkref(o)) {
return -1;
}
Py_INCREF(o);
Expand All @@ -564,12 +559,12 @@ proxy_dealloc(PyWeakReference *self)
/* sequence slots */

static int
proxy_contains(PyWeakReference *proxy, PyObject *value)
proxy_contains(PyObject *proxy, PyObject *value)
{
if (!proxy_checkref(proxy))
return -1;

PyObject *obj = PyWeakref_GET_OBJECT(proxy);
if (!proxy_checkref(obj)) {
return -1;
}
Py_INCREF(obj);
int res = PySequence_Contains(obj, value);
Py_DECREF(obj);
Expand All @@ -579,12 +574,12 @@ proxy_contains(PyWeakReference *proxy, PyObject *value)
/* mapping slots */

static Py_ssize_t
proxy_length(PyWeakReference *proxy)
proxy_length(PyObject *proxy)
{
if (!proxy_checkref(proxy))
return -1;

PyObject *obj = PyWeakref_GET_OBJECT(proxy);
if (!proxy_checkref(obj)) {
return -1;
}
Py_INCREF(obj);
Py_ssize_t res = PyObject_Length(obj);
Py_DECREF(obj);
Expand All @@ -594,12 +589,12 @@ proxy_length(PyWeakReference *proxy)
WRAP_BINARY(proxy_getitem, PyObject_GetItem)

static int
proxy_setitem(PyWeakReference *proxy, PyObject *key, PyObject *value)
proxy_setitem(PyObject *proxy, PyObject *key, PyObject *value)
{
if (!proxy_checkref(proxy))
return -1;

PyObject *obj = PyWeakref_GET_OBJECT(proxy);
if (!proxy_checkref(obj)) {
return -1;
}
Py_INCREF(obj);
int res;
if (value == NULL) {
Expand All @@ -614,24 +609,25 @@ proxy_setitem(PyWeakReference *proxy, PyObject *key, PyObject *value)
/* iterator slots */

static PyObject *
proxy_iter(PyWeakReference *proxy)
proxy_iter(PyObject *proxy)
{
if (!proxy_checkref(proxy))
return NULL;
PyObject *obj = PyWeakref_GET_OBJECT(proxy);
if (!proxy_checkref(obj)) {
return NULL;
}
Py_INCREF(obj);
PyObject* res = PyObject_GetIter(obj);
Py_DECREF(obj);
return res;
}

static PyObject *
proxy_iternext(PyWeakReference *proxy)
proxy_iternext(PyObject *proxy)
{
if (!proxy_checkref(proxy))
return NULL;

PyObject *obj = PyWeakref_GET_OBJECT(proxy);
if (!proxy_checkref(obj)) {
return NULL;
}
if (!PyIter_Check(obj)) {
PyErr_Format(PyExc_TypeError,
"Weakref proxy referenced a non-iterator '%.200s' object",
Expand Down Expand Up @@ -666,7 +662,7 @@ static PyNumberMethods proxy_as_number = {
proxy_neg, /*nb_negative*/
proxy_pos, /*nb_positive*/
proxy_abs, /*nb_absolute*/
(inquiry)proxy_bool, /*nb_bool*/
proxy_bool, /*nb_bool*/
proxy_invert, /*nb_invert*/
proxy_lshift, /*nb_lshift*/
proxy_rshift, /*nb_rshift*/
Expand Down Expand Up @@ -696,20 +692,20 @@ static PyNumberMethods proxy_as_number = {
};

static PySequenceMethods proxy_as_sequence = {
(lenfunc)proxy_length, /*sq_length*/
proxy_length, /*sq_length*/
0, /*sq_concat*/
0, /*sq_repeat*/
0, /*sq_item*/
0, /*sq_slice*/
0, /*sq_ass_item*/
0, /*sq_ass_slice*/
(objobjproc)proxy_contains, /* sq_contains */
0, /*sq_ass_slice*/
proxy_contains, /* sq_contains */
};

static PyMappingMethods proxy_as_mapping = {
(lenfunc)proxy_length, /*mp_length*/
proxy_length, /*mp_length*/
proxy_getitem, /*mp_subscript*/
(objobjargproc)proxy_setitem, /*mp_ass_subscript*/
proxy_setitem, /*mp_ass_subscript*/
};


Expand All @@ -734,17 +730,17 @@ _PyWeakref_ProxyType = {
0, /* tp_call */
proxy_str, /* tp_str */
proxy_getattr, /* tp_getattro */
(setattrofunc)proxy_setattr, /* tp_setattro */
proxy_setattr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
0, /* tp_doc */
(traverseproc)gc_traverse, /* tp_traverse */
(inquiry)gc_clear, /* tp_clear */
proxy_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
(getiterfunc)proxy_iter, /* tp_iter */
(iternextfunc)proxy_iternext, /* tp_iternext */
proxy_methods, /* tp_methods */
proxy_iter, /* tp_iter */
proxy_iternext, /* tp_iternext */
proxy_methods, /* tp_methods */
};


Expand All @@ -768,16 +764,16 @@ _PyWeakref_CallableProxyType = {
proxy_call, /* tp_call */
proxy_str, /* tp_str */
proxy_getattr, /* tp_getattro */
(setattrofunc)proxy_setattr, /* tp_setattro */
proxy_setattr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
0, /* tp_doc */
(traverseproc)gc_traverse, /* tp_traverse */
(inquiry)gc_clear, /* tp_clear */
proxy_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
(getiterfunc)proxy_iter, /* tp_iter */
(iternextfunc)proxy_iternext, /* tp_iternext */
proxy_iter, /* tp_iter */
proxy_iternext, /* tp_iternext */
};


Expand Down

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