Teach GRExprEngine to handle the initialization of the condition variable of a WhileStmt.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92106 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/GRExprEngine.cpp

@@ -751,6 +751,12 @@ void GRExprEngine::Visit(Stmt* S, ExplodedNode* Pred, ExplodedNodeSet& Dst) {
         VisitUnaryOperator(U, Pred, Dst, false);
       break;
     }
+      
+    case Stmt::WhileStmtClass:
+      // This case isn't for branch processing, but for handling the
+      // initialization of a condition variable.
+      VisitCondInit(cast<WhileStmt>(S)->getConditionVariable(), S, Pred, Dst);
+      break;      
   }
 }
 

test/Analysis/misc-ps-region-store.cpp

@@ -59,3 +59,18 @@ int test_init_in_condition_switch() {
   }
   return 0;
 }
+
+int test_init_in_condition_while() {
+  int y = 1;
+  while (int x = test_init_in_condition_aux()) { // no-warning
+    if (!x) {
+      y = 0;
+      break;
+    }
+  }  
+  if (!y) {
+    int *p = 0;
+    *p = 0xDEADBEEF; // no-warning
+  }
+  return 0;
+}