[Static Analyzer] Nullability checker optimization.

Differential Revision: http://reviews.llvm.org/D12848

llvm-svn: 247612

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/StaticAnalyzer/Checkers/NullabilityChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/NullabilityChecker.cpp
index cc1d058205c..74a7e38e944 100644
--- a/clang/lib/StaticAnalyzer/Checkers/NullabilityChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/NullabilityChecker.cpp
@@ -406,12 +406,17 @@ void NullabilityChecker::reportBugIfPreconditionHolds(
 /// Cleaning up the program state.
 void NullabilityChecker::checkDeadSymbols(SymbolReaper &SR,
                                           CheckerContext &C) const {
+  if (!SR.hasDeadSymbols())
+    return;
+
   ProgramStateRef State = C.getState();
   NullabilityMapTy Nullabilities = State->get<NullabilityMap>();
   for (NullabilityMapTy::iterator I = Nullabilities.begin(),
                                   E = Nullabilities.end();
        I != E; ++I) {
-    if (!SR.isLiveRegion(I->first)) {
+    const auto *Region = I->first->getAs<SymbolicRegion>();
+    assert(Region && "Non-symbolic region is tracked.");
+    if (SR.isDead(Region->getSymbol())) {
       State = State->remove<NullabilityMap>(I->first);
     }
   }