[analyzer] MisusedMovedObject: Fix state-resetting a base-class sub-object.

If a method is resetting the state of an object that was moved from, it should
be safe to use this object again. However if the method was defined in a parent
class, but used in a child class, the reset didn't happen from the checker's
perspective.

Differential Revision: https://reviews.llvm.org/D31538

llvm-svn: 315301

1 files changed, 8 insertions, 1 deletions

diff --git a/clang/lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp
index 70da66dba47..4b69a1bd1ed 100644
--- a/clang/lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp
@@ -416,7 +416,14 @@ void MisusedMovedObjectChecker::checkPreCall(const CallEvent &Call,
     return;
 
   if (isStateResetMethod(MethodDecl)) {
-    State = State->remove<TrackedRegionMap>(ThisRegion);
+    // A state reset method resets the whole object, not only sub-object
+    // of a parent class in which it is defined.
+    const MemRegion *WholeObjectRegion = ThisRegion;
+    while (const CXXBaseObjectRegion *BR =
+               dyn_cast<CXXBaseObjectRegion>(WholeObjectRegion))
+      WholeObjectRegion = BR->getSuperRegion();
+
+    State = State->remove<TrackedRegionMap>(WholeObjectRegion);
     C.addTransition(State);
     return;
   }