When @encode'ing a C++ class that has empty base classes, we can end

up with gaps when the class inherits from the same empty base class
more than once. Fixes <rdar://problem/11324167>.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@155738 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/ASTContext.cpp

@@ -4787,11 +4787,8 @@ void ASTContext::getObjCEncodingForStructureImpl(RecordDecl *RDecl,
   std::multimap<uint64_t, NamedDecl *>::iterator
     CurLayObj = FieldOrBaseOffsets.begin();
 
-  if ((CurLayObj != FieldOrBaseOffsets.end() && CurLayObj->first != 0) ||
-      (CurLayObj == FieldOrBaseOffsets.end() &&
-         CXXRec && CXXRec->isDynamicClass())) {
-    assert(CXXRec && CXXRec->isDynamicClass() &&
-           "Offset 0 was empty but no VTable ?");
+  if (CXXRec && CXXRec->isDynamicClass() &&
+      (CurLayObj == FieldOrBaseOffsets.end() || CurLayObj->first != 0)) {
     if (FD) {
       S += "\"_vptr$";
       std::string recname = CXXRec->getNameAsString();

test/CodeGenObjCXX/encode.mm

@@ -187,3 +187,17 @@ @implementation RedBalloonHGXFormWrapper
 class CefBrowserImpl2 : public CefBrowser2 {};
 // CHECK: @_ZL2g7 = internal constant [26 x i8] c"{CefBrowserImpl2=^^?^^?i}\00"
 const char g7[] = @encode(CefBrowserImpl2);
+
+// <rdar://problem/11324167>
+struct Empty {};
+
+struct X : Empty { 
+  int array[10];
+};
+
+struct Y : Empty {
+  X vec;
+};
+
+// CHECK: @_ZL2g8 = internal constant [14 x i8] c"{Y={X=[10i]}}\00"
+const char g8[] = @encode(Y);