Hi,
Le mer. 18 déc. 2019 à 16:43, Julien Danjou <jul...@danjou.info> a écrit :
> The only way to retrieve the current exception is via sys.excinfo or
> PyErr_GetExcInfo in C. However, the issue is that they don't take a
> PyThreadState as argument, but use _PyThreadState_GET() to retrieve the
> thread state.
If we add the following function, does it solve your use case?
void
_PyErr_GetExcInfo(PyThreadState *tstate,
PyObject **p_type, PyObject **p_value, PyObject **p_traceback)
> In order to retrieve the exception from *any* PyThreadState, the caller
> has to use _PyErr_GetTopmostException which takes a PyThreadState as
> argument — though that function is private and therefore not documented
> or usable in an external module (in theory at least).
What if this function is exported as a private function? Usually,
functions in Python header files are prefixed by PyAPI_FUNC(), but for
an unknown reason, this one is not:
_PyErr_StackItem *_PyErr_GetTopmostException(PyThreadState *tstate);
Maybe it's because the author didn't want to expose the private
_PyErr_StackItem structure?
> Should we make _PyErr_GetTopmostException public, or implement something
> different to retrieve the top most exception from a PyThreadState?
IMHO a _PyErr_GetExcInfo() function taking a tstate parameter is a
better idea than exposing the private _PyErr_StackItem structure.
Private functions *can* be used for debuggers, but we don't provide
any warranty that the function is not going to disappear. Such
functions have been moved to the internal API for example. The
internal C API *can* be used, but you have to opt-in so you know that
you get unstable APIs :-)
Victor
--
Night gathers, and now my watch begins. It shall not end until my death.
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