1 files changed, 54 insertions, 0 deletions

diff --git a/include/lldb/Expression/ExpressionTypeSystemHelper.h b/include/lldb/Expression/ExpressionTypeSystemHelper.h
new file mode 100644
index 000000000000..cb560c9b5a42
--- /dev/null
+++ b/include/lldb/Expression/ExpressionTypeSystemHelper.h
@@ -0,0 +1,54 @@
+//===-- ExpressionTypeSystemHelper.h ---------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef ExpressionTypeSystemHelper_h
+#define ExpressionTypeSystemHelper_h
+
+#include "llvm/Support/Casting.h"
+
+namespace lldb_private
+{
+
+//----------------------------------------------------------------------
+/// @class ExpressionTypeSystemHelper ExpressionTypeSystemHelper.h "lldb/Expression/ExpressionTypeSystemHelper.h"
+/// @brief A helper object that the Expression can pass to its ExpressionParser to provide generic information that
+/// any type of expression will need to supply.  It's only job is to support dyn_cast so that the expression parser
+/// can cast it back to the requisite specific type.
+///
+//----------------------------------------------------------------------
+
+class ExpressionTypeSystemHelper
+{
+public:
+    enum LLVMCastKind {
+        eKindClangHelper,
+        eKindSwiftHelper,
+        eKindGoHelper,
+        kNumKinds
+    };
+
+    LLVMCastKind getKind() const { return m_kind; }
+
+    ExpressionTypeSystemHelper (LLVMCastKind kind) :
+        m_kind(kind)
+    {
+    }
+    
+    ~ExpressionTypeSystemHelper () {}
+
+protected:
+    LLVMCastKind m_kind;
+};
+
+
+
+
+} // namespace lldb_private
+
+#endif /* ExpressionTypeSystemHelper_h */