[DexTer] Add step.UNKNOWN check for NoneType line numbers.
Summary: It's possible for an instance of the visual studio debugger
to return a NoneType line number location when stepping during a
debugging session.
This patches teaches DexTer how to handle this particular case without
crashing out.
Reviewers: Orlando
Differential revision: https://reviews.llvm.org/D75992
GitOrigin-RevId: 09f4bdc03f891cbcf0c5633c8c7013eb0fbe626f
diff --git a/dexter/dex/dextIR/DextIR.py b/dexter/dex/dextIR/DextIR.py
index 7638e8b..b82c2ba 100644
--- a/dexter/dex/dextIR/DextIR.py
+++ b/dexter/dex/dextIR/DextIR.py
@@ -102,6 +102,10 @@
frame_step = self._get_prev_step_in_this_frame(step)
prev_step = frame_step if frame_step is not None else prev_step
+ # If we're missing line numbers to compare then the step kind has to be UNKNOWN.
+ if prev_step.current_location.lineno is None or step.current_location.lineno is None:
+ return StepKind.UNKNOWN
+
# We're in the same func as prev step, check lineo.
if prev_step.current_location.lineno > step.current_location.lineno:
return StepKind.VERTICAL_BACKWARD
