Fix -Wuninitialized regression involving functions invalidating parameters passed by reference.

llvm-svn: 135610

clang/lib/Analysis/UninitializedValues.cpp

@@ -441,8 +441,10 @@ void TransferFunctions::VisitDeclRefExpr(DeclRefExpr *dr) {
   // Record the last DeclRefExpr seen.  This is an lvalue computation.
   // We use this value to later detect if a variable "escapes" the analysis.
   if (const VarDecl *vd = dyn_cast<VarDecl>(dr->getDecl()))
-    if (isTrackedVar(vd))
+    if (isTrackedVar(vd)) {
+      ProcessUses();
       lastDR = dr;
+    }
 }
 
 void TransferFunctions::VisitDeclStmt(DeclStmt *ds) {

clang/test/SemaCXX/uninit-variables.cpp

@@ -66,6 +66,16 @@ test4_A test4() {
  return a; // expected-warning{{variable 'a' is uninitialized when used here}}
 }
 
+// Test variables getting invalidated by function calls with reference arguments
+// *AND* there are multiple invalidated arguments.
+void test5_aux(int &, int &);
+
+int test5() {
+  int x, y;
+  test5_aux(x, y);
+  return x + y; // no-warning
+}
+
 // This test previously crashed Sema.
 class Rdar9188004A {
 public: