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PEP 205, Weak References -- initial checkin.

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Fred Drake 2001-02-01 05:27:45 +00:00
parent 2de7471d69
commit 41deb1efc2
9 changed files with 1158 additions and 4 deletions
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23
Objects/object.c
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@ -100,6 +100,10 @@ PyObject_Init(PyObject *op, PyTypeObject *tp)
/* Any changes should be reflected in PyObject_INIT (objimpl.h) */
op->ob_type = tp;
_Py_NewReference(op);
if (PyType_SUPPORTS_WEAKREFS(tp)) {
PyObject **weaklist = PyObject_GET_WEAKREFS_LISTPTR(op);
*weaklist = NULL;
}
return op;
}
@ -119,6 +123,10 @@ PyObject_InitVar(PyVarObject *op, PyTypeObject *tp, int size)
op->ob_size = size;
op->ob_type = tp;
_Py_NewReference((PyObject *)op);
if (PyType_SUPPORTS_WEAKREFS(tp)) {
PyObject **weaklist = PyObject_GET_WEAKREFS_LISTPTR(op);
*weaklist = NULL;
}
return op;
}
@ -1458,6 +1466,21 @@ PyObject_Free(void *p)
}
/* Hook to clear up weak references only once the _weakref module is
imported. We use a dummy implementation to simplify the code at each
call site instead of requiring a test for NULL.
*/
static int
empty_clear_weak_refs(PyObject *o)
{
return 1;
}
int (*PyObject_ClearWeakRefs)(PyObject *) = empty_clear_weak_refs;
/* These methods are used to control infinite recursion in repr, str, print,
etc. Container objects that may recursively contain themselves,
e.g. builtin dictionaries and lists, should used Py_ReprEnter() and