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GH-96421: Insert shim frame on entry to interpreter (GH-96319)

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* Adds EXIT_INTERPRETER instruction to exit PyEval_EvalDefault()

* Simplifies RETURN_VALUE, YIELD_VALUE and RETURN_GENERATOR instructions as they no longer need to check for entry frames.
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Mark Shannon 2022-11-10 04:34:57 -08:00 • committed by GitHub
parent dbf2faf579
commit 1e197e63e2
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GPG key ID: 4AEE18F83AFDEB23
24 changed files with 450 additions and 346 deletions
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15
Objects/genobject.c
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@ -207,8 +207,6 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
Py_INCREF(result);
_PyFrame_StackPush(frame, result);
frame->previous = tstate->cframe->current_frame;
_PyErr_StackItem *prev_exc_info = tstate->exc_info;
gen->gi_exc_state.previous_item = prev_exc_info;
tstate->exc_info = &gen->gi_exc_state;
@ -223,14 +221,8 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
result = _PyEval_EvalFrame(tstate, frame, exc);
assert(tstate->exc_info == prev_exc_info);
assert(gen->gi_exc_state.previous_item == NULL);
if (gen->gi_frame_state == FRAME_EXECUTING) {
gen->gi_frame_state = FRAME_COMPLETED;
}
assert(tstate->cframe->current_frame == frame->previous);
/* Don't keep the reference to previous any longer than necessary. It
* may keep a chain of frames alive or it could create a reference
* cycle. */
frame->previous = NULL;
assert(gen->gi_frame_state != FRAME_EXECUTING);
assert(frame->previous == NULL);
/* If the generator just returned (as opposed to yielding), signal
* that the generator is exhausted. */
@ -255,8 +247,7 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
/* first clean reference cycle through stored exception traceback */
_PyErr_ClearExcState(&gen->gi_exc_state);
gen->gi_frame_state = FRAME_CLEARED;
_PyFrame_Clear(frame);
assert(gen->gi_frame_state == FRAME_CLEARED);
*presult = result;
return result ? PYGEN_RETURN : PYGEN_ERROR;
}