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#ifndef Py_INTERNAL_OBJECT_H
#define Py_INTERNAL_OBJECT_H
#ifdef __cplusplus
extern "C" {
#endif
#if !defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_BUILTIN)
# error "this header requires Py_BUILD_CORE or Py_BUILD_CORE_BUILTIN defined"
#endif
/* Tell the GC to track this object.
*
* NB: While the object is tracked by the collector, it must be safe to call the
* ob_traverse method.
*
* Internal note: _PyRuntime.gc.generation0->_gc_prev doesn't have any bit flags
* because it's not object header. So we don't use _PyGCHead_PREV() and
* _PyGCHead_SET_PREV() for it to avoid unnecessary bitwise operations.
*
* The PyObject_GC_Track() function is the public version of this macro.
*/
#define _PyObject_GC_TRACK(o) do { \
PyGC_Head *g = _Py_AS_GC(o); \
if (g->_gc_next != 0) { \
Py_FatalError("GC object already tracked"); \
} \
assert((g->_gc_prev & _PyGC_PREV_MASK_COLLECTING) == 0); \
PyGC_Head *last = (PyGC_Head*)(_PyRuntime.gc.generation0->_gc_prev); \
_PyGCHead_SET_NEXT(last, g); \
_PyGCHead_SET_PREV(g, last); \
_PyGCHead_SET_NEXT(g, _PyRuntime.gc.generation0); \
_PyRuntime.gc.generation0->_gc_prev = (uintptr_t)g; \
} while (0);
/* Tell the GC to stop tracking this object.
*
* Internal note: This may be called while GC. So _PyGC_PREV_MASK_COLLECTING must
* be cleared. But _PyGC_PREV_MASK_FINALIZED bit is kept.
*
* The PyObject_GC_UnTrack() function is the public version of this macro.
*/
#define _PyObject_GC_UNTRACK(o) do { \
PyGC_Head *g = _Py_AS_GC(o); \
PyGC_Head *prev = _PyGCHead_PREV(g); \
PyGC_Head *next = _PyGCHead_NEXT(g); \
assert(next != NULL); \
_PyGCHead_SET_NEXT(prev, next); \
_PyGCHead_SET_PREV(next, prev); \
g->_gc_next = 0; \
g->_gc_prev &= _PyGC_PREV_MASK_FINALIZED; \
} while (0);
#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_OBJECT_H */
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