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bpo-31033: Improve the traceback for cancelled asyncio tasks (GH-19951)

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When an asyncio.Task is cancelled, the exception traceback now
starts with where the task was first interrupted.  Previously,
the traceback only had "depth one."
This commit is contained in:
Chris Jerdonek 2020-05-17 22:47:31 -07:00 • committed by GitHub
parent d17f3d8315
commit da742ba826
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GPG key ID: 4AEE18F83AFDEB23
10 changed files with 290 additions and 80 deletions
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14
Python/errors.c
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@ -512,6 +512,20 @@ _PyErr_ChainExceptions(PyObject *exc, PyObject *val, PyObject *tb)
}
}
void
_PyErr_ChainStackItem(_PyErr_StackItem *exc_state)
{
if (exc_state->exc_type == NULL || exc_state->exc_type == Py_None) {
return;
}
Py_INCREF(exc_state->exc_type);
Py_XINCREF(exc_state->exc_value);
Py_XINCREF(exc_state->exc_traceback);
_PyErr_ChainExceptions(exc_state->exc_type,
exc_state->exc_value,
exc_state->exc_traceback);
}
static PyObject *
_PyErr_FormatVFromCause(PyThreadState *tstate, PyObject *exception,
const char *format, va_list vargs)