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Specialize Py_DECREF() for Py_REF_DEBUG #16781

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vstinner wants to merge 1 commit into from
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Specialize Py_DECREF() for Py_REF_DEBUG #16781

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27 changes: 16 additions & 11 deletions 27 Include/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -461,25 +461,30 @@ static inline void _Py_INCREF(PyObject *op)

#define Py_INCREF(op) _Py_INCREF(_PyObject_CAST(op))

#ifdef Py_REF_DEBUG
static inline void _Py_DECREF(const char *filename, int lineno,
PyObject *op)
{
(void)filename; /* may be unused, shut up -Wunused-parameter */
(void)lineno; /* may be unused, shut up -Wunused-parameter */
_Py_DEC_REFTOTAL;
if (--op->ob_refcnt != 0) {
#ifdef Py_REF_DEBUG
if (op->ob_refcnt < 0) {
_Py_NegativeRefcount(filename, lineno, op);
}
#endif
_Py_RefTotal--;

@shihai1991 shihai1991 Oct 15, 2019

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So this _Py_DEC_REFTOTAL would be converted in your plan?

@vstinner vstinner Oct 15, 2019

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_Py_DEC_REFTOTAL = _Py_RefTotal-- when Py_REF_DEBUG is defined. I prefer to put directly the real code, it may help debugging. It avoids the indirection of the preprocessor.

if (--op->ob_refcnt == 0) {
_Py_Dealloc(op);

@Yhg1s Yhg1s Jan 3, 2020

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This code dupe irks me. Can't you make the REF_DEBUG version call the regular version instead?

}
else {
else if (op->ob_refcnt < 0) {
_Py_NegativeRefcount(filename, lineno, op);
}
}

# define Py_DECREF(op) _Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))
#else
static inline void _Py_DECREF(PyObject *op)
{
if (--op->ob_refcnt == 0) {
_Py_Dealloc(op);
}
}

#define Py_DECREF(op) _Py_DECREF(__FILE__, __LINE__, _PyObject_CAST(op))
# define Py_DECREF(op) _Py_DECREF(_PyObject_CAST(op))
#endif /* !Py_REF_DEBUG */


/* Safely decref `op` and set `op` to NULL, especially useful in tp_clear
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