Dead emit dead store warnings when assigning nil to an ObjC object

pointer (for defensive programming).  This matches the behavior with
assigning NULL to a regular pointer.  Fixes <rdar://problem/7631278>.

llvm-svn: 96985

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/test/Analysis/dead-stores.m b/clang/test/Analysis/dead-stores.m
index 765a24a3c35..701e5802b25 100644
--- a/clang/test/Analysis/dead-stores.m
+++ b/clang/test/Analysis/dead-stores.m
@@ -34,3 +34,10 @@ void DeadStoreTest(NSObject *anObject) {
       ([keys containsObject:@"name"] && [keys containsObject:@"icon"])) {}
 }
 
+// This test case was a false positive due to how clang models
+// pointer types and ObjC object pointer types differently.  Here
+// we don't warn about a dead store because 'nil' is assigned to
+// an object pointer for the sake of defensive programming.
+void rdar_7631278(NSObject *x) {
+  x = ((void*)0);
+}