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diff --git a/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.h b/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.h
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+++ b/source/Plugins/ExpressionParser/Clang/ClangPersistentVariables.h
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+//===-- ClangPersistentVariables.h ------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_ClangPersistentVariables_h_
+#define liblldb_ClangPersistentVariables_h_
+
+// C Includes
+// C++ Includes
+// Other libraries and framework includes
+#include "llvm/ADT/DenseMap.h"
+
+// Project includes
+#include "ClangExpressionVariable.h"
+#include "ClangModulesDeclVendor.h"
+
+#include "lldb/Expression/ExpressionVariable.h"
+
+namespace lldb_private
+{
+    
+//----------------------------------------------------------------------
+/// @class ClangPersistentVariables ClangPersistentVariables.h "lldb/Expression/ClangPersistentVariables.h"
+/// @brief Manages persistent values that need to be preserved between expression invocations.
+///
+/// A list of variables that can be accessed and updated by any expression.  See
+/// ClangPersistentVariable for more discussion.  Also provides an increasing,
+/// 0-based counter for naming result variables.
+//----------------------------------------------------------------------
+class ClangPersistentVariables : public PersistentExpressionState
+{
+public:
+    ClangPersistentVariables();
+
+    ~ClangPersistentVariables() override = default;
+
+    //------------------------------------------------------------------
+    // llvm casting support
+    //------------------------------------------------------------------
+    static bool classof(const PersistentExpressionState *pv)
+    {
+        return pv->getKind() == PersistentExpressionState::eKindClang;
+    }
+
+    lldb::ExpressionVariableSP
+    CreatePersistentVariable (const lldb::ValueObjectSP &valobj_sp) override;
+
+    lldb::ExpressionVariableSP
+    CreatePersistentVariable (ExecutionContextScope *exe_scope,
+                              const ConstString &name, 
+                              const CompilerType& compiler_type, 
+                              lldb::ByteOrder byte_order, 
+                              uint32_t addr_byte_size) override;
+
+    //----------------------------------------------------------------------
+    /// Return the next entry in the sequence of strings "$0", "$1", ... for
+    /// use naming persistent expression convenience variables.
+    ///
+    /// @return
+    ///     A string that contains the next persistent variable name.
+    //----------------------------------------------------------------------
+    ConstString
+    GetNextPersistentVariableName () override;
+    
+    void
+    RemovePersistentVariable (lldb::ExpressionVariableSP variable) override;
+    
+    lldb::addr_t
+    LookupSymbol (const ConstString &name) override { return LLDB_INVALID_ADDRESS; }
+
+    void
+    RegisterPersistentType (const ConstString &name,
+                            clang::TypeDecl *tag_decl);
+    
+    clang::TypeDecl *
+    GetPersistentType (const ConstString &name);
+    
+    void
+    AddHandLoadedClangModule(ClangModulesDeclVendor::ModuleID module)
+    {
+        m_hand_loaded_clang_modules.push_back(module);
+    }
+    
+    const ClangModulesDeclVendor::ModuleVector &GetHandLoadedClangModules()
+    {
+        return m_hand_loaded_clang_modules;
+    }
+    
+private:
+    uint32_t                                                m_next_persistent_variable_id;  ///< The counter used by GetNextResultName().
+    
+    typedef llvm::DenseMap<const char *, clang::TypeDecl *> PersistentTypeMap;
+    PersistentTypeMap                                       m_persistent_types;             ///< The persistent types declared by the user.
+    
+    ClangModulesDeclVendor::ModuleVector                    m_hand_loaded_clang_modules;    ///< These are Clang modules we hand-loaded; these are the highest-
+                                                                                            ///< priority source for macros.
+};
+
+} // namespace lldb_private
+
+#endif // liblldb_ClangPersistentVariables_h_