2 files changed, 15 insertions, 0 deletions
diff --git a/include/clang/Analysis/PathSensitive/MemRegion.h b/include/clang/Analysis/PathSensitive/MemRegion.h
index 40c6fde51e..80efac4dbf 100644
--- a/include/clang/Analysis/PathSensitive/MemRegion.h
+++ b/include/clang/Analysis/PathSensitive/MemRegion.h
@@ -100,6 +100,8 @@ public:
     return superRegion;
   }
 
+  bool isSubRegionOf(const MemRegion* R) const;
+
   static bool classof(const MemRegion* R) {
     return R->getKind() > SymbolicRegionKind;
   }
diff --git a/lib/Analysis/MemRegion.cpp b/lib/Analysis/MemRegion.cpp
index 8767781354..c1b6ed32d5 100644
--- a/lib/Analysis/MemRegion.cpp
+++ b/lib/Analysis/MemRegion.cpp
@@ -21,6 +21,19 @@ using namespace clang;
 
 MemRegion::~MemRegion() {}
 
+bool SubRegion::isSubRegionOf(const MemRegion* R) const {
+  const MemRegion* r = getSuperRegion();
+  while (r != 0) {
+    if (r == R)
+      return true;
+    if (const SubRegion* sr = dyn_cast<SubRegion>(r))
+      r = sr->getSuperRegion();
+    else
+      break;
+  }
+  return false;
+}
+
 void MemSpaceRegion::Profile(llvm::FoldingSetNodeID& ID) const {
   ID.AddInteger((unsigned)getKind());
 }