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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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16
Include/internal/pycore_object.h
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@ -73,15 +73,25 @@ PyAPI_FUNC(int) _PyObject_IsFreed(PyObject *);
#define _PyObject_HEAD_INIT(type) \
{ \
.ob_ref_local = _Py_IMMORTAL_REFCNT_LOCAL, \
.ob_flags = _Py_STATICALLY_ALLOCATED_FLAG, \
.ob_type = (type) \
}
#else
#if SIZEOF_VOID_P > 4
#define _PyObject_HEAD_INIT(type) \
{ \
.ob_refcnt = _Py_IMMORTAL_INITIAL_REFCNT, \
.ob_flags = _Py_STATICALLY_ALLOCATED_FLAG, \
.ob_type = (type) \
}
#else
#define _PyObject_HEAD_INIT(type) \
{ \
.ob_refcnt = _Py_IMMORTAL_INITIAL_REFCNT, \
.ob_refcnt = _Py_STATIC_IMMORTAL_INITIAL_REFCNT, \
.ob_type = (type) \
}
#endif
#endif
#define _PyVarObject_HEAD_INIT(type, size) \
{ \
.ob_base = _PyObject_HEAD_INIT(type), \
@ -127,7 +137,11 @@ static inline void _Py_RefcntAdd(PyObject* op, Py_ssize_t n)
_Py_AddRefTotal(_PyThreadState_GET(), n);
#endif
#if !defined(Py_GIL_DISABLED)
#if SIZEOF_VOID_P > 4
op->ob_refcnt += (PY_UINT32_T)n;
#else
op->ob_refcnt += n;
#endif
#else
if (_Py_IsOwnedByCurrentThread(op)) {
uint32_t local = op->ob_ref_local;