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GH-125174: Mark objects as statically allocated. (#127797)

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* Set a bit in the unused part of the refcount on 64 bit machines and the free-threaded build.

* Use the top of the refcount range on 32 bit machines
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Mark Shannon 2024-12-11 17:37:38 +00:00 • committed by GitHub
parent dd9da738ad
commit bc262de06b
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7 changed files with 99 additions and 13 deletions
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12
Objects/object.c
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@ -2475,10 +2475,16 @@ new_reference(PyObject *op)
{
// Skip the immortal object check in Py_SET_REFCNT; always set refcnt to 1
#if !defined(Py_GIL_DISABLED)
#if SIZEOF_VOID_P > 4
op->ob_refcnt_full = 1;
assert(op->ob_refcnt == 1);
assert(op->ob_flags == 0);
#else
op->ob_refcnt = 1;
#endif
#else
op->ob_tid = _Py_ThreadId();
op->_padding = 0;
op->ob_flags = 0;
op->ob_mutex = (PyMutex){ 0 };
op->ob_gc_bits = 0;
op->ob_ref_local = 1;
@ -2515,6 +2521,10 @@ _Py_SetImmortalUntracked(PyObject *op)
|| PyUnicode_CHECK_INTERNED(op) == SSTATE_INTERNED_IMMORTAL_STATIC);
}
#endif
// Check if already immortal to avoid degrading from static immortal to plain immortal
if (_Py_IsImmortal(op)) {
return;
}
#ifdef Py_GIL_DISABLED
op->ob_tid = _Py_UNOWNED_TID;
op->ob_ref_local = _Py_IMMORTAL_REFCNT_LOCAL;