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bpo-40170: PyObject_GET_WEAKREFS_LISTPTR() becomes a function (GH-19377)
Convert the PyObject_GET_WEAKREFS_LISTPTR() macro to a function to hide implementation details: the macro accessed directly to the PyTypeObject.tp_weaklistoffset member. Add _PyObject_GET_WEAKREFS_LISTPTR() static inline function to the internal C API.
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@ -138,8 +138,7 @@ PyAPI_FUNC(PyObject *) _PyObject_GC_Calloc(size_t size);
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/* Test if a type supports weak references */
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#define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0)
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#define PyObject_GET_WEAKREFS_LISTPTR(o) \
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((PyObject **) (((char *) (o)) + Py_TYPE(o)->tp_weaklistoffset))
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PyAPI_FUNC(PyObject **) PyObject_GET_WEAKREFS_LISTPTR(PyObject *op);
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#ifdef __cplusplus
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}
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@ -87,6 +87,13 @@ extern void _Py_PrintReferences(FILE *);
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extern void _Py_PrintReferenceAddresses(FILE *);
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#endif
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static inline PyObject **
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_PyObject_GET_WEAKREFS_LISTPTR(PyObject *op)
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{
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Py_ssize_t offset = Py_TYPE(op)->tp_weaklistoffset;
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return (PyObject **)((char *)op + offset);
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}
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#ifdef __cplusplus
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}
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#endif
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@ -0,0 +1,3 @@
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Convert the :c:func:`PyObject_GET_WEAKREFS_LISTPTR` macro to a function to hide
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implementation details: the macro accessed directly to the
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:c:member:`PyTypeObject.tp_weaklistoffset` member.
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@ -1,8 +1,9 @@
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#include "Python.h"
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#include "pycore_object.h" // _PyObject_GET_WEAKREFS_LISTPTR
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#define GET_WEAKREFS_LISTPTR(o) \
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((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
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((PyWeakReference **) _PyObject_GET_WEAKREFS_LISTPTR(o))
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/*[clinic input]
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module _weakref
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@ -788,7 +788,7 @@ handle_weakrefs(PyGC_Head *unreachable, PyGC_Head *old)
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/* It supports weakrefs. Does it have any? */
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wrlist = (PyWeakReference **)
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PyObject_GET_WEAKREFS_LISTPTR(op);
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_PyObject_GET_WEAKREFS_LISTPTR(op);
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/* `op` may have some weakrefs. March over the list, clear
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* all the weakrefs, and move the weakrefs with callbacks
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@ -2206,6 +2206,14 @@ _Py_Dealloc(PyObject *op)
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(*dealloc)(op);
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}
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PyObject **
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PyObject_GET_WEAKREFS_LISTPTR(PyObject *op)
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{
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return _PyObject_GET_WEAKREFS_LISTPTR(op);
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}
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#ifdef __cplusplus
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}
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#endif
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@ -1271,7 +1271,7 @@ subtype_dealloc(PyObject *self)
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if (type->tp_weaklistoffset && !base->tp_weaklistoffset) {
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/* Modeled after GET_WEAKREFS_LISTPTR() */
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PyWeakReference **list = (PyWeakReference **) \
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PyObject_GET_WEAKREFS_LISTPTR(self);
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_PyObject_GET_WEAKREFS_LISTPTR(self);
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while (*list)
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_PyWeakref_ClearRef(*list);
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}
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@ -1,9 +1,10 @@
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#include "Python.h"
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#include "pycore_object.h" // _PyObject_GET_WEAKREFS_LISTPTR
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#include "structmember.h"
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#define GET_WEAKREFS_LISTPTR(o) \
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((PyWeakReference **) PyObject_GET_WEAKREFS_LISTPTR(o))
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((PyWeakReference **) _PyObject_GET_WEAKREFS_LISTPTR(o))
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Py_ssize_t
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