NoQ updated this revision to Diff 173779.
NoQ added a comment.
Bring back the early return for destructors. Cleaning up the state might be
unnecessary, but calling a destructor on a moved object is still fine and
should not cause a warning.
Add a test because this wasn't caught by tests.
https://reviews.llvm.org/D54372
Files:
lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp
test/Analysis/MisusedMovedObject.cpp
Index: test/Analysis/MisusedMovedObject.cpp
===================================================================
--- test/Analysis/MisusedMovedObject.cpp
+++ test/Analysis/MisusedMovedObject.cpp
@@ -710,3 +710,15 @@
Empty f = std::move(e); // no-warning
}
}
+
+struct MoveOnlyWithDestructor {
+ MoveOnlyWithDestructor();
+ ~MoveOnlyWithDestructor();
+ MoveOnlyWithDestructor(const MoveOnlyWithDestructor &m) = delete;
+ MoveOnlyWithDestructor(MoveOnlyWithDestructor &&m);
+};
+
+MoveOnlyWithDestructor foo() {
+ MoveOnlyWithDestructor m;
+ return m;
+}
Index: lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp
+++ lib/StaticAnalyzer/Checkers/MisusedMovedObjectChecker.cpp
@@ -43,10 +43,9 @@
};
class MisusedMovedObjectChecker
- : public Checker<check::PreCall, check::PostCall, check::EndFunction,
+ : public Checker<check::PreCall, check::PostCall,
check::DeadSymbols, check::RegionChanges> {
public:
- void checkEndFunction(const ReturnStmt *RS, CheckerContext &C) const;
void checkPreCall(const CallEvent &MC, CheckerContext &C) const;
void checkPostCall(const CallEvent &MC, CheckerContext &C) const;
void checkDeadSymbols(SymbolReaper &SR, CheckerContext &C) const;
@@ -218,42 +217,6 @@
return nullptr;
}
-// Removing the function parameters' MemRegion from the state. This is needed
-// for PODs where the trivial destructor does not even created nor executed.
-void MisusedMovedObjectChecker::checkEndFunction(const ReturnStmt *RS,
- CheckerContext &C) const {
- auto State = C.getState();
- TrackedRegionMapTy Objects = State->get<TrackedRegionMap>();
- if (Objects.isEmpty())
- return;
-
- auto LC = C.getLocationContext();
-
- const auto LD = dyn_cast_or_null<FunctionDecl>(LC->getDecl());
- if (!LD)
- return;
- llvm::SmallSet<const MemRegion *, 8> InvalidRegions;
-
- for (auto Param : LD->parameters()) {
- auto Type = Param->getType().getTypePtrOrNull();
- if (!Type)
- continue;
- if (!Type->isPointerType() && !Type->isReferenceType()) {
- InvalidRegions.insert(State->getLValue(Param, LC).getAsRegion());
- }
- }
-
- if (InvalidRegions.empty())
- return;
-
- for (const auto &E : State->get<TrackedRegionMap>()) {
- if (InvalidRegions.count(E.first->getBaseRegion()))
- State = State->remove<TrackedRegionMap>(E.first);
- }
-
- C.addTransition(State);
-}
-
void MisusedMovedObjectChecker::checkPostCall(const CallEvent &Call,
CheckerContext &C) const {
const auto *AFC = dyn_cast<AnyFunctionCall>(&Call);
@@ -384,20 +347,18 @@
return;
}
+ // Calling a destructor on a moved object is fine.
+ if (isa<CXXDestructorCall>(&Call))
+ return;
+
const auto IC = dyn_cast<CXXInstanceCall>(&Call);
if (!IC)
return;
// In case of destructor call we do not track the object anymore.
const MemRegion *ThisRegion = IC->getCXXThisVal().getAsRegion();
if (!ThisRegion)
return;
- if (dyn_cast_or_null<CXXDestructorDecl>(Call.getDecl())) {
- State = removeFromState(State, ThisRegion);
- C.addTransition(State);
- return;
- }
-
const auto MethodDecl = dyn_cast_or_null<CXXMethodDecl>(IC->getDecl());
if (!MethodDecl)
return;
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