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Interpreter code generators need to be able to handle basic flow control #123391
Description
In order to be able to flush the stack efficiently around escaping calls, the interpreter code generators need to be able to handle simple-ish flow control.
For example, in this code:
op(_CHECK_PERIODIC, (--)) {
if (_Py_atomic_load_uintptr_relaxed(&tstate->eval_breaker) & _PY_EVAL_EVENTS_MASK) {
int err = _Py_HandlePending(tstate);
ERROR_IF(err != 0, error);
}
}
The general shape is:
if (cond) {
*escaping_call()*
}
We want to be able to track the flow control so that we can spill around the call, but not on the fast path:
if (cond) {
SPILL_STACK();
*escaping_call()*
RELOAD_STACK();
}
We cannot currently do this.
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