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GH-118095: Allow a variant of RESUME_CHECK in tier 2 (GH-118286)

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Mark Shannon 2024-04-29 07:54:05 +01:00 • committed by GitHub
parent aa8f6d2708
commit ab6eda0ee5
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6 changed files with 189 additions and 103 deletions
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23
Python/bytecodes.c
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@ -4258,6 +4258,29 @@ dummy_func(
}
/* Special version of RESUME_CHECK that (when paired with _EVAL_BREAKER_EXIT)
* is safe for tier 2. Progress is guaranteed because _EVAL_BREAKER_EXIT calls
* _Py_HandlePending which clears the eval_breaker so that _TIER2_RESUME_CHECK
* will not exit if it is immediately executed again. */
tier2 op(_TIER2_RESUME_CHECK, (--)) {
#if defined(__EMSCRIPTEN__)
EXIT_IF(_Py_emscripten_signal_clock == 0);
_Py_emscripten_signal_clock -= Py_EMSCRIPTEN_SIGNAL_HANDLING;
#endif
uintptr_t eval_breaker = _Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker);
EXIT_IF(eval_breaker & _PY_EVAL_EVENTS_MASK);
assert(eval_breaker == FT_ATOMIC_LOAD_UINTPTR_ACQUIRE(_PyFrame_GetCode(frame)->_co_instrumentation_version));
}
tier2 op(_EVAL_BREAKER_EXIT, (--)) {
_Py_CHECK_EMSCRIPTEN_SIGNALS_PERIODICALLY();
QSBR_QUIESCENT_STATE(tstate);
if (_Py_HandlePending(tstate) != 0) {
GOTO_UNWIND();
}
EXIT_TO_TRACE();
}
// END BYTECODES //
}