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GH-96793: Change FOR_ITER to not pop the iterator on exhaustion. (GH-96801)

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Change FOR_ITER to have the same stack effect regardless of whether it branches or not.
Performance is unchanged as FOR_ITER (and specialized forms jump over the cleanup code).
This commit is contained in:
Mark Shannon 2022-10-27 03:55:03 -07:00 • committed by GitHub
parent e60892f9db
commit 22863df7ca
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14 changed files with 277 additions and 247 deletions
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8
Python/specialize.c
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@ -2208,12 +2208,8 @@ _Py_Specialize_ForIter(PyObject *iter, _Py_CODEUNIT *instr)
_Py_SET_OPCODE(*instr, FOR_ITER_RANGE);
goto success;
}
else {
SPECIALIZATION_FAIL(FOR_ITER,
_PySpecialization_ClassifyIterator(iter));
goto failure;
}
failure:
SPECIALIZATION_FAIL(FOR_ITER,
_PySpecialization_ClassifyIterator(iter));
STAT_INC(FOR_ITER, failure);
cache->counter = adaptive_counter_backoff(cache->counter);
return;