[libclang] During member ref expression visitation, ignore base anonymous struct/union fields.

Otherwise they will shadow the real field that that we are interested in.

rdar://19783938

llvm-svn: 232141

1 files changed, 15 insertions, 2 deletions

diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index efe20e27d82..1b41e0066f5 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2238,8 +2238,21 @@ void EnqueueVisitor::VisitMemberExpr(const MemberExpr *M) {
   // visit it.
   // FIXME: If we ever want to show these implicit accesses, this will be
   // unfortunate. However, clang_getCursor() relies on this behavior.
-  if (!M->isImplicitAccess())
-    AddStmt(M->getBase());
+  if (M->isImplicitAccess())
+    return;
+
+  // Ignore base anonymous struct/union fields, otherwise they will shadow the
+  // real field that that we are interested in.
+  if (auto *SubME = dyn_cast<MemberExpr>(M->getBase())) {
+    if (auto *FD = dyn_cast_or_null<FieldDecl>(SubME->getMemberDecl())) {
+      if (FD->isAnonymousStructOrUnion()) {
+        AddStmt(SubME->getBase());
+        return;
+      }
+    }
+  }
+
+  AddStmt(M->getBase());
 }
 void EnqueueVisitor::VisitObjCEncodeExpr(const ObjCEncodeExpr *E) {
   AddTypeLoc(E->getEncodedTypeSourceInfo());