Enhances SCA to process untyped region to typed region conversion.

 - RegionView and RegionViewMap is introduced to assist back-mapping from
   super region to subregions.
 - GDM is used to carry RegionView information.
 - AnonTypedRegion is added to represent a typed region introduced by pointer
   casting. Later AnonTypedRegion can be used in other similar cases, e.g.,
   malloc()'ed region.
 - The specific conversion is delegated to store manager.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59382 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/Analysis/GRExprEngine.cpp b/lib/Analysis/GRExprEngine.cpp
index 55fbf1874a..e002c13637 100644
--- a/lib/Analysis/GRExprEngine.cpp
+++ b/lib/Analysis/GRExprEngine.cpp
@@ -1692,6 +1692,21 @@ void GRExprEngine::VisitCast(Expr* CastE, Expr* Ex, NodeTy* Pred, NodeSet& Dst){
       continue;
     }
 
+    // Check for casts from AllocaRegion pointer to typed pointer.
+    if (isa<loc::MemRegionVal>(V)) {
+      assert(Loc::IsLocType(T));
+      assert(Loc::IsLocType(ExTy));
+
+      // Delegate to store manager.
+      const GRState* NewSt = getStoreManager().CastRegion(St, V, T, CastE);
+
+      // If no new region is created, fall through to the default case.
+      if (NewSt != St) {
+        MakeNode(Dst, CastE, N, NewSt);
+        continue;
+      }
+    }
+
     // All other cases.
     MakeNode(Dst, CastE, N, BindExpr(St, CastE, EvalCast(V, CastE->getType())));
   }