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cpython/Modules/_weakref.c at 3.7 · python-emscripten/cpython · GitHub
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Modules
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_weakref.c
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#include
"Python.h"
#define
GET_WEAKREFS_LISTPTR
(
o
) \
((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
/*[clinic input]
module _weakref
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=ffec73b85846596d]*/
#include
"clinic/_weakref.c.h"
/*[clinic input]
_weakref.getweakrefcount -> Py_ssize_t
object: object
/
Return the number of weak references to 'object'.
[clinic start generated code]*/
static
Py_ssize_t
_weakref_getweakrefcount_impl
(
PyObject
*
module
,
PyObject
*
object
)
/*[clinic end generated code: output=301806d59558ff3e input=cedb69711b6a2507]*/
{
PyWeakReference
*
*
list
;
if
(!
PyType_SUPPORTS_WEAKREFS
(
Py_TYPE
(
object
)))
return
0
;
list
=
GET_WEAKREFS_LISTPTR
(
object
);
return
_PyWeakref_GetWeakrefCount
(
*
list
);
}
static
int
is_dead_weakref
(
PyObject
*
value
)
{
if
(!
PyWeakref_Check
(
value
)) {
PyErr_SetString
(
PyExc_TypeError
,
"not a weakref"
);
return
-1
;
}
return
PyWeakref_GET_OBJECT
(
value
)
==
Py_None
;
}
/*[clinic input]
_weakref._remove_dead_weakref -> object
dct: object(subclass_of='&PyDict_Type')
key: object
/
Atomically remove key from dict if it points to a dead weakref.
[clinic start generated code]*/
static
PyObject
*
_weakref__remove_dead_weakref_impl
(
PyObject
*
module
,
PyObject
*
dct
,
PyObject
*
key
)
/*[clinic end generated code: output=d9ff53061fcb875c input=19fc91f257f96a1d]*/
{
if
(
_PyDict_DelItemIf
(
dct
,
key
,
is_dead_weakref
)
<
0
) {
if
(
PyErr_ExceptionMatches
(
PyExc_KeyError
))
/* This function is meant to allow safe weak-value dicts
with GC in another thread (see issue #28427), so it's
ok if the key doesn't exist anymore.
*/
PyErr_Clear
();
else
return
NULL
;
}
Py_RETURN_NONE
;
}
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
_WEAKREF__REMOVE_DEAD_WEAKREF_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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