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diff --git a/source/Plugins/ExpressionParser/Clang/ClangDeclVendor.h b/source/Plugins/ExpressionParser/Clang/ClangDeclVendor.h
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+++ b/source/Plugins/ExpressionParser/Clang/ClangDeclVendor.h
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+//===-- ClangDeclVendor.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 liblldb_ClangDeclVendor_h_
+#define liblldb_ClangDeclVendor_h_
+
+#include "lldb/Core/ClangForward.h"
+#include "lldb/Symbol/DeclVendor.h"
+
+#include "clang/AST/ExternalASTMerger.h"
+
+namespace lldb_private {
+
+// A clang specialized extension to DeclVendor.
+class ClangDeclVendor : public DeclVendor {
+public:
+ ClangDeclVendor(DeclVendorKind kind) : DeclVendor(kind) {}
+
+ virtual ~ClangDeclVendor() {}
+
+ /// Interface for ExternalASTMerger. Returns an ImporterSource allowing type
+ /// completion.
+ ///
+ /// \return
+ /// An ImporterSource for this ClangDeclVendor.
+ virtual clang::ExternalASTMerger::ImporterSource GetImporterSource() = 0;
+
+ uint32_t FindDecls(ConstString name, bool append, uint32_t max_matches,
+ std::vector<CompilerDecl> &decls) override;
+
+ virtual uint32_t FindDecls(ConstString name, bool append,
+ uint32_t max_matches,
+ std::vector<clang::NamedDecl *> &decls) = 0;
+
+ static bool classof(const DeclVendor *vendor) {
+ return vendor->GetKind() >= eClangDeclVendor &&
+ vendor->GetKind() < eLastClangDeclVendor;
+ }
+
+private:
+ DISALLOW_COPY_AND_ASSIGN(ClangDeclVendor);
+};
+} // namespace lldb_private
+
+#endif