labath commandeered this revision.
labath edited reviewers, added: rupprecht; removed: labath.
labath added a reviewer: mib.
labath added inline comments.
================
Comment at:
lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.h:277-285
+ if (_Py_IsFinalizing()) {
+ // Leak m_py_obj rather than crashing the process.
+ // https://docs.python.org/3/c-api/init.html#c.PyGILState_Ensure
+ } else {
+ auto gstate = PyGILState_Ensure();
+ Py_DECREF(m_py_obj);
+ PyGILState_Release(gstate);
----------------
labath wrote:
> As I mentioned internally, I think this should be placed inside the
> ScriptInterpreterPythonImpl destructor (and elsewhere, if needed), as that's
> the level at which we do our normal locking. There it can become a regular
> `Locker` object, since that function will be called from
> SBDebugger::Terminate (or maybe even earlier, in either case it will be
> before any global destructors run).
>
> The reason this can't be done with StructuredPythonObject, is because this
> one gets passed on to python code, which can delete it (or not) at pretty
> much arbitrary time. PythonObjects OTOH, are just C++ handles to python
> objects, and we should be able to keep track of their lifetimes reasonably
> well.
>
> We can put an assert here to ensure the callers obey this contract.
It turns out this is not as easy as I made it sound. I thought one could just
put the lock around the body of the destructor, but (of course) destructors for
subobjects run only after the body of the main object desctructor terminates. I
mean, it would still be possible to make it work that way, but it wouldn't be
as pretty. So, after some soul-searching, I decided to keep the current
implementation.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D114722/new/
https://reviews.llvm.org/D114722
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