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#include "Python.h"
#define GET_WEAKREFS_LISTPTR(o) \
((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
/*[clinic]
module _weakref
_weakref.getweakrefcount -> Py_ssize_t
object: object
/
Return the number of weak references to 'object'.
[clinic]*/
PyDoc_STRVAR(_weakref_getweakrefcount__doc__,
"Return the number of weak references to \'object\'.\n"
"\n"
"_weakref.getweakrefcount(object)");
#define _WEAKREF_GETWEAKREFCOUNT_METHODDEF \
{"getweakrefcount", (PyCFunction)_weakref_getweakrefcount, METH_O, _weakref_getweakrefcount__doc__},
static Py_ssize_t
_weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object);
static PyObject *
_weakref_getweakrefcount(PyModuleDef *module, PyObject *object)
{
PyObject *return_value = NULL;
Py_ssize_t _return_value;
_return_value = _weakref_getweakrefcount_impl(module, object);
if ((_return_value == -1) && PyErr_Occurred())
goto exit;
return_value = PyLong_FromSsize_t(_return_value);
exit:
return return_value;
}
static Py_ssize_t
_weakref_getweakrefcount_impl(PyModuleDef *module, PyObject *object)
/*[clinic checksum: 015113be0c9a0a8672d35df10c63e3642cc23da4]*/
{
PyWeakReference **list;
if (!PyType_SUPPORTS_WEAKREFS(Py_TYPE(object)))
return 0;
list = GET_WEAKREFS_LISTPTR(object);
return _PyWeakref_GetWeakrefCount(*list);
}
PyDoc_STRVAR(weakref_getweakrefs__doc__,
"getweakrefs(object) -- return a list of all weak reference objects\n"
"that point to 'object'.");
static PyObject *
weakref_getweakrefs(PyObject *self, PyObject *object)
{
PyObject *result = NULL;
if (PyType_SUPPORTS_WEAKREFS(Py_TYPE(object))) {
PyWeakReference **list = GET_WEAKREFS_LISTPTR(object);
Py_ssize_t count = _PyWeakref_GetWeakrefCount(*list);
result = PyList_New(count);
if (result != NULL) {
PyWeakReference *current = *list;
Py_ssize_t i;
for (i = 0; i < count; ++i) {
PyList_SET_ITEM(result, i, (PyObject *) current);
Py_INCREF(current);
current = current->wr_next;
}
}
}
else {
result = PyList_New(0);
}
return result;
}
PyDoc_STRVAR(weakref_proxy__doc__,
"proxy(object[, callback]) -- create a proxy object that weakly\n"
"references 'object'. 'callback', if given, is called with a\n"
"reference to the proxy when 'object' is about to be finalized.");
static PyObject *
weakref_proxy(PyObject *self, PyObject *args)
{
PyObject *object;
PyObject *callback = NULL;
PyObject *result = NULL;
if (PyArg_UnpackTuple(args, "proxy", 1, 2, &object, &callback)) {
result = PyWeakref_NewProxy(object, callback);
}
return result;
}
static PyMethodDef
weakref_functions[] = {
_WEAKREF_GETWEAKREFCOUNT_METHODDEF
{"getweakrefs", weakref_getweakrefs, METH_O,
weakref_getweakrefs__doc__},
{"proxy", weakref_proxy, METH_VARARGS,
weakref_proxy__doc__},
{NULL, NULL, 0, NULL}
};
static struct PyModuleDef weakrefmodule = {
PyModuleDef_HEAD_INIT,
"_weakref",
"Weak-reference support module.",
-1,
weakref_functions,
NULL,
NULL,
NULL,
NULL
};
PyMODINIT_FUNC
PyInit__weakref(void)
{
PyObject *m;
m = PyModule_Create(&weakrefmodule);
if (m != NULL) {
Py_INCREF(&_PyWeakref_RefType);
PyModule_AddObject(m, "ref",
(PyObject *) &_PyWeakref_RefType);
Py_INCREF(&_PyWeakref_RefType);
PyModule_AddObject(m, "ReferenceType",
(PyObject *) &_PyWeakref_RefType);
Py_INCREF(&_PyWeakref_ProxyType);
PyModule_AddObject(m, "ProxyType",
(PyObject *) &_PyWeakref_ProxyType);
Py_INCREF(&_PyWeakref_CallableProxyType);
PyModule_AddObject(m, "CallableProxyType",
(PyObject *) &_PyWeakref_CallableProxyType);
}
return m;
}
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