Fix PR 3836 by eagerly assuming symbolic constraints returned by unary '!'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67260 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 2 deletions

diff --git a/lib/Analysis/GRExprEngine.cpp b/lib/Analysis/GRExprEngine.cpp
index 6d360ed503..1f47bc7f33 100644
--- a/lib/Analysis/GRExprEngine.cpp
+++ b/lib/Analysis/GRExprEngine.cpp
@@ -394,9 +394,17 @@ void GRExprEngine::Visit(Stmt* S, NodeTy* Pred, NodeSet& Dst) {
       VisitLValue(cast<StringLiteral>(S), Pred, Dst);
       break;
       
-    case Stmt::UnaryOperatorClass:
-      VisitUnaryOperator(cast<UnaryOperator>(S), Pred, Dst, false);
+    case Stmt::UnaryOperatorClass: {
+      UnaryOperator *U = cast<UnaryOperator>(S);
+      if (EagerlyAssume && (U->getOpcode() == UnaryOperator::LNot)) {
+        NodeSet Tmp;
+        VisitUnaryOperator(U, Pred, Tmp, false);
+        EvalEagerlyAssume(Dst, Tmp, U);
+      }
+      else
+        VisitUnaryOperator(U, Pred, Dst, false);
       break;
+    }
   }
 }