[Lldb-commits] [PATCH] D68188: allow arbitrary python streams to be converted to SBFile

Lawrence D'Anna via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Thu Oct 3 12:32:30 PDT 2019

lawrence_danna added inline comments.

Comment at: lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp:1238-1245
+// OwnedPythonFile<Base>::IsValid() chains into Base::IsValid()
+// File::IsValid() is false by default, but for the following classes
+// we want the file to be considered valid as long as the python bits
+// are valid.
+class PresumptivelyValidFile : public File {
+  bool IsValid() const override { return true; };
labath wrote:
> lawrence_danna wrote:
> > labath wrote:
> > > How about if OwnedPythonFile defines `IsValid()` as `IsPythonObjectValid() || Base::IsValid()`. Then PythonIOFile could redefine it to be simply `IsPythonObjectValid()` without the need for the extra class?
> > If I did that then a SimplePythonFile would still be valid if the file was closed on the python side... seems like the wrong behavior.
> Sorry, I meant &&: `IsPythonObjectValid() && Base::IsValid()`. Basically, I'm trying to see if there's a reasonable way to reduce the number of classes floating around, and this `PresumptivelyValidFile` seems like it could be avoided...
If i did it that way, with `&&` and no `PresumptivelyValidFile` then the python IO files would chain into the base `File` class and say they're invalid.

That's how I coded it up at first, I didn't notice I needed `PresumptivelyValidFile` until I saw the python IO files coming up as invalid.

Comment at: lldb/source/Plugins/ScriptInterpreter/Python/PythonDataObjects.cpp:1278
+class BinaryPythonFile : public PythonIOFile {
+  friend class PythonFile;
labath wrote:
> lawrence_danna wrote:
> > labath wrote:
> > > What is this needed for? I don't see the PythonFile class doing anything funny (and it probably shouldn't).
> > python API functions expect you to check for an exception with PyErr_Occured() and clear it before calling into them again.   If you don't things usually work out OK, except on a debug build in which an assert will trip.
> Are you sure you're looking at the right place (the comments tend to move around as you reorganize code)? I was asking why is PythonFile a friend of the BinaryPythonFile class. That doesn't seem relevant to the PyErr_Occured checks...
oh, yea it got moved around. fixed.

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