================
@@ -0,0 +1,101 @@
+//===-- DILAST.h ------------------------------------------------*- C++
-*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLDB_VALUEOBJECT_DILAST_H
+#define LLDB_VALUEOBJECT_DILAST_H
+
+#include "lldb/ValueObject/ValueObject.h"
+#include <string>
+
+namespace lldb_private::dil {
+
+/// The various types DIL AST nodes (used by the DIL parser).
+enum class NodeKind {
+ eErrorNode,
+ eIdentifierNode,
+};
+
+/// Forward declaration, for use in DIL AST nodes. Definition is at the very
+/// end of this file.
+class Visitor;
+
+/// The rest of the classes in this file, except for the Visitor class at the
+/// very end, define all the types of AST nodes used by the DIL parser and
+/// expression evaluator. The DIL parser parses the input string and creates
+/// the AST parse tree from the AST nodes. The resulting AST node tree gets
+/// passed to the DIL expression evaluator, which evaluates the DIL AST nodes
+/// and creates/returns a ValueObjectSP containing the result.
+
+/// Base class for AST nodes used by the Data Inspection Language (DIL) parser.
+/// All of the specialized types of AST nodes inherit from this (virtual) base
+/// class.
+class DILASTNode {
----------------
labath wrote:
```suggestion
class ASTNode {
```
... given that this is already in the `dil` namespace?
https://github.com/llvm/llvm-project/pull/120971
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