Import Clang r74788.

1 files changed, 13 insertions, 2 deletions

diff --git a/lib/Analysis/Environment.cpp b/lib/Analysis/Environment.cpp
index 2b751df..3f8f14d 100644
--- a/lib/Analysis/Environment.cpp
+++ b/lib/Analysis/Environment.cpp
@@ -143,8 +143,19 @@ EnvironmentManager::RemoveDeadBindings(Environment Env, Stmt* Loc,
       SVal X = I.getData();
 
       // If the block expr's value is a memory region, then mark that region.
-      if (isa<loc::MemRegionVal>(X))
-        DRoots.push_back(cast<loc::MemRegionVal>(X).getRegion());
+      if (isa<loc::MemRegionVal>(X)) {
+        const MemRegion* R = cast<loc::MemRegionVal>(X).getRegion();
+        DRoots.push_back(R);
+        // Mark the super region of the RX as live.
+        // e.g.: int x; char *y = (char*) &x; if (*y) ... 
+        // 'y' => element region. 'x' is its super region.
+        // We only add one level super region for now.
+
+        // FIXME: maybe multiple level of super regions should be added.
+        if (const SubRegion *SR = dyn_cast<SubRegion>(R)) {
+          DRoots.push_back(SR->getSuperRegion());
+        }
+      }
 
       // Mark all symbols in the block expr's value live.
       MarkLiveCallback cb(SymReaper);