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bpo-45711: [asyncio] Normalize exceptions immediately after Fetch, before they are stored as StackItem, which should be normalized by iritkatriel · Pull Request #29890 · python/cpython · GitHub

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bpo-45711: [asyncio] Normalize exceptions immediately after Fetch, before they are stored as StackItem, which should be normalized #29890

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Merged
iritkatriel merged 5 commits into from
Dec 3, 2021
Conversation 6 Commits 5 Checks 0 Files changed
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bpo-45711: [asyncio] Normalize exceptions immediately after Fetch, before they are stored as StackItem, which should be normalized #29890

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847fcdb
bpo-45711: Remove unnecessary normalization of exc_info
iritkatriel Dec 2, 2021
acc65e6
put the traceback update back in _PyErr_ChainStackItem
iritkatriel Dec 2, 2021
a995431
normalize exceptions after Fetch when they are about to be stored as …
iritkatriel Dec 2, 2021
6ce3848
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 2, 2021
e1a719a
Revert "bpo-45711: Remove unnecessary normalization of exc_info"
iritkatriel Dec 2, 2021
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2021-12-02-17-22-06.bpo-45711.D6jsdv.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Make :mod:`asyncio` normalize exceptions as soon as they are captured with :c:func:`PyErr_Fetch`, and before they are stored as an exc_info triplet. This brings :mod:`asyncio` in line with the rest of the codebase, where an exc_info triplet is always normalized.
19 changes: 12 additions & 7 deletions Modules/_asynciomodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2702,6 +2702,11 @@ task_step_impl(TaskObj *task, PyObject *exc)
if (PyErr_ExceptionMatches(asyncio_CancelledError)) {
/* CancelledError */
PyErr_Fetch(&et, &ev, &tb);
assert(et);
PyErr_NormalizeException(&et, &ev, &tb);
if (tb != NULL) {
PyException_SetTraceback(ev, tb);
}

FutureObj *fut = (FutureObj*)task;
_PyErr_StackItem *exc_state = &fut->fut_cancelled_exc_state;
Expand All @@ -2714,14 +2719,12 @@ task_step_impl(TaskObj *task, PyObject *exc)

/* Some other exception; pop it and call Task.set_exception() */
PyErr_Fetch(&et, &ev, &tb);

assert(et);
if (!ev || !PyObject_TypeCheck(ev, (PyTypeObject *) et)) {
PyErr_NormalizeException(&et, &ev, &tb);
}
PyErr_NormalizeException(&et, &ev, &tb);
if (tb != NULL) {
PyException_SetTraceback(ev, tb);
}

o = future_set_exception((FutureObj*)task, ev);
if (!o) {
/* An exception in Task.set_exception() */
Expand Down Expand Up @@ -2965,7 +2968,7 @@ task_step(TaskObj *task, PyObject *exc)
PyObject *et, *ev, *tb;
PyErr_Fetch(&et, &ev, &tb);
leave_task(task->task_loop, (PyObject*)task);
_PyErr_ChainExceptions(et, ev, tb);
_PyErr_ChainExceptions(et, ev, tb); /* Normalizes (et, ev, tb) */
return NULL;
}
else {
Expand Down Expand Up @@ -3014,8 +3017,10 @@ task_wakeup(TaskObj *task, PyObject *o)
}

PyErr_Fetch(&et, &ev, &tb);
if (!ev || !PyObject_TypeCheck(ev, (PyTypeObject *) et)) {
PyErr_NormalizeException(&et, &ev, &tb);
assert(et);
PyErr_NormalizeException(&et, &ev, &tb);
if (tb != NULL) {
PyException_SetTraceback(ev, tb);
}

result = task_step(task, ev);
Expand Down
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