From 3f5a85ad062e341ecf9a9ed459406e76390c032c Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Wed, 11 Mar 2009 02:29:48 +0000
Subject: SimpleConstraintManager doesn't reason about bitwise-constraints on
 symbolic values. Indicating this in 'canReasonAbout' allows GRExprEngine to
 recover path-sensitivity in some cases.

llvm-svn: 66628
---
 clang/lib/Analysis/SimpleConstraintManager.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'clang/lib/Analysis/SimpleConstraintManager.cpp')

diff --git a/clang/lib/Analysis/SimpleConstraintManager.cpp b/clang/lib/Analysis/SimpleConstraintManager.cpp
index 82cc0bb7bc2..a4d59bec887 100644
--- a/clang/lib/Analysis/SimpleConstraintManager.cpp
+++ b/clang/lib/Analysis/SimpleConstraintManager.cpp
@@ -21,6 +21,19 @@ namespace clang {
 SimpleConstraintManager::~SimpleConstraintManager() {}
 
 bool SimpleConstraintManager::canReasonAbout(SVal X) const {
+  if (nonloc::SymIntConstraintVal *Y = dyn_cast<nonloc::SymIntConstraintVal>(&X)) {
+    const SymIntConstraint& C = Y->getConstraint();
+    switch (C.getOpcode()) {
+        // We don't reason yet about bitwise-constraints on symbolic values.
+      case BinaryOperator::And:
+      case BinaryOperator::Or:
+      case BinaryOperator::Xor:
+        return false;
+      default:
+        return true;
+    }
+  }
+
   return true;
 }
   
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