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GH-117108: Set the "old space bit" to "visited" for all young objects (#117213)

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Change old space bit of young objects from 0 to gcstate->visited_space.
This ensures that any object created *and* collected during cycle GC has the bit set correctly.
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Mark Shannon 2024-03-26 11:11:42 +00:00 • committed by GitHub
parent bf82f77957
commit 8bef34f625
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5 changed files with 56 additions and 43 deletions
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Include/internal/pycore_object.h
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@ -318,8 +318,8 @@ static inline void _PyObject_GC_TRACK(
PyGC_Head *last = (PyGC_Head*)(generation0->_gc_prev);
_PyGCHead_SET_NEXT(last, gc);
_PyGCHead_SET_PREV(gc, last);
_PyGCHead_SET_NEXT(gc, generation0);
assert((gc->_gc_next & _PyGC_NEXT_MASK_OLD_SPACE_1) == 0);
/* Young objects will be moved into the visited space during GC, so set the bit here */
gc->_gc_next = ((uintptr_t)generation0) | interp->gc.visited_space;
generation0->_gc_prev = (uintptr_t)gc;
#endif
}