Fix a bug in objc @encoding of C++ classes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138235 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 24 insertions, 1 deletions

diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index a731782a7a..1b2c5cf418 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -4565,7 +4565,9 @@ void ASTContext::getObjCEncodingForStructureImpl(RecordDecl *RDecl,
   std::multimap<uint64_t, NamedDecl *>::iterator
     CurLayObj = FieldOrBaseOffsets.begin();
 
-  if (CurLayObj != FieldOrBaseOffsets.end() && CurLayObj->first != 0) {
+  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 (FD) {
diff --git a/test/CodeGenObjCXX/encode.mm b/test/CodeGenObjCXX/encode.mm
index 2c10fbcb97..677f5e2a7c 100644
--- a/test/CodeGenObjCXX/encode.mm
+++ b/test/CodeGenObjCXX/encode.mm
@@ -105,6 +105,27 @@ namespace rdar9624314 {
   const char g2[] = @encode(S2);
 }
 
+namespace test {
+  class Foo {
+  public:
+   virtual void f() {};
+  };
+  
+  class Bar {
+  public:
+   virtual void g() {};
+  };
+  
+  class Zoo : virtual public Foo, virtual public Bar {
+  public:
+   int x;
+   int y;
+  };
+
+  // CHECK: @_ZN4testL3ecdE = internal constant [15 x i8] c"{Zoo=^^?ii^^?}\00"
+  const char ecd[] = @encode(Zoo);
+}
+
 struct Base1 {
   char x;
 };