Provide intermediate solution to handling assignments to structs via an

integer pointer.  For now just invalidate the fields of the struct.

This addresses: <rdar://problem/7185607> [RegionStore] support invalidation of bit fields using integer assignment



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@82492 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 19 insertions, 0 deletions

diff --git a/lib/Analysis/RegionStore.cpp b/lib/Analysis/RegionStore.cpp
index 4186690939..f4f2fecc21 100644
--- a/lib/Analysis/RegionStore.cpp
+++ b/lib/Analysis/RegionStore.cpp
@@ -1302,6 +1302,10 @@ const GRState *RegionStoreManager::Bind(const GRState *state, Loc L, SVal V) {
             ValMgr.getSValuator().EvalCast(V, state, superTy, erTy);
           return Bind(cr.getState(), loc::MemRegionVal(superR), cr.getSVal());
         }
+        // For now, just invalidate the fields of the struct/union/class.
+        // FIXME: Precisely handle the fields of the record.
+        if (superTy->isRecordType())
+          return InvalidateRegion(state, superR, NULL, 0);
       }
     }
   }
diff --git a/test/Analysis/misc-ps-region-store.m b/test/Analysis/misc-ps-region-store.m
index 9f639ea610..c5bc0a68ff 100644
--- a/test/Analysis/misc-ps-region-store.m
+++ b/test/Analysis/misc-ps-region-store.m
@@ -167,3 +167,18 @@ void f() {
     *q = 3; // no-warning
   }
 }
+
+// <rdar://problem/7185607>
+// Bit-fields of a struct should be invalidated when blasting the entire
+// struct with an integer constant.
+struct test_7185607 {
+  int x : 10;
+  int y : 22;
+};
+int rdar_test_7185607() {
+  struct test_7185607 s; // Uninitialized.
+  *((unsigned *) &s) = 0U;
+  return s.x; // no-warning
+}
+
+