analyzer: Provide temporary workaround for false positive reported by

<rdar://problem/6704930> involving SimpleConstraintManager not reasoning well
about symbolic constraint values involving arithmetic operators.

llvm-svn: 67534

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/Analysis/SimpleConstraintManager.cpp b/clang/lib/Analysis/SimpleConstraintManager.cpp
index a4d59bec887..e6f940e57cc 100644
--- a/clang/lib/Analysis/SimpleConstraintManager.cpp
+++ b/clang/lib/Analysis/SimpleConstraintManager.cpp
@@ -29,6 +29,17 @@ bool SimpleConstraintManager::canReasonAbout(SVal X) const {
       case BinaryOperator::Or:
       case BinaryOperator::Xor:
         return false;
+        // We don't reason yet about arithmetic constraints on symbolic values.
+      case BinaryOperator::Mul:
+      case BinaryOperator::Div:
+      case BinaryOperator::Rem:
+      case BinaryOperator::Add:
+      case BinaryOperator::Sub:
+      case BinaryOperator::Shl:
+      case BinaryOperator::Shr:
+        return false;
+
+        // All other cases.
       default:
         return true;
     }