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diff --git a/contrib/llvm-project/clang/include/clang/ExtractAPI/Serialization/SerializerBase.h b/contrib/llvm-project/clang/include/clang/ExtractAPI/Serialization/SerializerBase.h
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index 000000000000..f0629a9ad56b
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+++ b/contrib/llvm-project/clang/include/clang/ExtractAPI/Serialization/SerializerBase.h
@@ -0,0 +1,314 @@
+//===- ExtractAPI/Serialization/SerializerBase.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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file defines the ExtractAPI APISetVisitor interface.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_EXTRACTAPI_SERIALIZATION_SERIALIZERBASE_H
+#define LLVM_CLANG_EXTRACTAPI_SERIALIZATION_SERIALIZERBASE_H
+
+#include "clang/ExtractAPI/API.h"
+
+namespace clang {
+namespace extractapi {
+
+/// The base interface of visitors for API information.
+template <typename Derived> class APISetVisitor {
+public:
+  void traverseAPISet() {
+    getDerived()->traverseNamespaces();
+
+    getDerived()->traverseGlobalVariableRecords();
+
+    getDerived()->traverseGlobalFunctionRecords();
+
+    getDerived()->traverseEnumRecords();
+
+    getDerived()->traverseStaticFieldRecords();
+
+    getDerived()->traverseCXXClassRecords();
+
+    getDerived()->traverseClassTemplateRecords();
+
+    getDerived()->traverseClassTemplateSpecializationRecords();
+
+    getDerived()->traverseClassTemplatePartialSpecializationRecords();
+
+    getDerived()->traverseCXXInstanceMethods();
+
+    getDerived()->traverseCXXStaticMethods();
+
+    getDerived()->traverseCXXMethodTemplates();
+
+    getDerived()->traverseCXXMethodTemplateSpecializations();
+
+    getDerived()->traverseCXXFields();
+
+    getDerived()->traverseCXXFieldTemplates();
+
+    getDerived()->traverseConcepts();
+
+    getDerived()->traverseGlobalVariableTemplateRecords();
+
+    getDerived()->traverseGlobalVariableTemplateSpecializationRecords();
+
+    getDerived()->traverseGlobalVariableTemplatePartialSpecializationRecords();
+
+    getDerived()->traverseGlobalFunctionTemplateRecords();
+
+    getDerived()->traverseGlobalFunctionTemplateSpecializationRecords();
+
+    getDerived()->traverseRecordRecords();
+
+    getDerived()->traverseObjCInterfaces();
+
+    getDerived()->traverseObjCProtocols();
+
+    getDerived()->traverseObjCCategories();
+
+    getDerived()->traverseMacroDefinitionRecords();
+
+    getDerived()->traverseTypedefRecords();
+  }
+
+  void traverseNamespaces() {
+    for (const auto &Namespace : API.getNamespaces())
+      getDerived()->visitNamespaceRecord(*Namespace.second);
+  }
+
+  void traverseGlobalFunctionRecords() {
+    for (const auto &GlobalFunction : API.getGlobalFunctions())
+      getDerived()->visitGlobalFunctionRecord(*GlobalFunction.second);
+  }
+
+  void traverseGlobalVariableRecords() {
+    for (const auto &GlobalVariable : API.getGlobalVariables())
+      getDerived()->visitGlobalVariableRecord(*GlobalVariable.second);
+  }
+
+  void traverseEnumRecords() {
+    for (const auto &Enum : API.getEnums())
+      getDerived()->visitEnumRecord(*Enum.second);
+  }
+
+  void traverseRecordRecords() {
+    for (const auto &Record : API.getRecords())
+      getDerived()->visitRecordRecord(*Record.second);
+  }
+
+  void traverseStaticFieldRecords() {
+    for (const auto &StaticField : API.getStaticFields())
+      getDerived()->visitStaticFieldRecord(*StaticField.second);
+  }
+
+  void traverseCXXClassRecords() {
+    for (const auto &Class : API.getCXXClasses())
+      getDerived()->visitCXXClassRecord(*Class.second);
+  }
+
+  void traverseCXXMethodTemplates() {
+    for (const auto &MethodTemplate : API.getCXXMethodTemplates())
+      getDerived()->visitMethodTemplateRecord(*MethodTemplate.second);
+  }
+
+  void traverseCXXMethodTemplateSpecializations() {
+    for (const auto &MethodTemplateSpecialization :
+         API.getCXXMethodTemplateSpecializations())
+      getDerived()->visitMethodTemplateSpecializationRecord(
+          *MethodTemplateSpecialization.second);
+  }
+
+  void traverseClassTemplateRecords() {
+    for (const auto &ClassTemplate : API.getClassTemplates())
+      getDerived()->visitClassTemplateRecord(*ClassTemplate.second);
+  }
+
+  void traverseClassTemplateSpecializationRecords() {
+    for (const auto &ClassTemplateSpecialization :
+         API.getClassTemplateSpecializations())
+      getDerived()->visitClassTemplateSpecializationRecord(
+          *ClassTemplateSpecialization.second);
+  }
+
+  void traverseClassTemplatePartialSpecializationRecords() {
+    for (const auto &ClassTemplatePartialSpecialization :
+         API.getClassTemplatePartialSpecializations())
+      getDerived()->visitClassTemplatePartialSpecializationRecord(
+          *ClassTemplatePartialSpecialization.second);
+  }
+
+  void traverseCXXInstanceMethods() {
+    for (const auto &InstanceMethod : API.getCXXInstanceMethods())
+      getDerived()->visitCXXInstanceMethodRecord(*InstanceMethod.second);
+  }
+
+  void traverseCXXStaticMethods() {
+    for (const auto &InstanceMethod : API.getCXXStaticMethods())
+      getDerived()->visitCXXStaticMethodRecord(*InstanceMethod.second);
+  }
+
+  void traverseCXXFields() {
+    for (const auto &CXXField : API.getCXXFields())
+      getDerived()->visitCXXFieldRecord(*CXXField.second);
+  }
+
+  void traverseCXXFieldTemplates() {
+    for (const auto &CXXFieldTemplate : API.getCXXFieldTemplates())
+      getDerived()->visitCXXFieldTemplateRecord(*CXXFieldTemplate.second);
+  }
+
+  void traverseGlobalVariableTemplateRecords() {
+    for (const auto &GlobalVariableTemplate : API.getGlobalVariableTemplates())
+      getDerived()->visitGlobalVariableTemplateRecord(
+          *GlobalVariableTemplate.second);
+  }
+
+  void traverseGlobalVariableTemplateSpecializationRecords() {
+    for (const auto &GlobalVariableTemplateSpecialization :
+         API.getGlobalVariableTemplateSpecializations())
+      getDerived()->visitGlobalVariableTemplateSpecializationRecord(
+          *GlobalVariableTemplateSpecialization.second);
+  }
+
+  void traverseGlobalVariableTemplatePartialSpecializationRecords() {
+    for (const auto &GlobalVariableTemplatePartialSpecialization :
+         API.getGlobalVariableTemplatePartialSpecializations())
+      getDerived()->visitGlobalVariableTemplatePartialSpecializationRecord(
+          *GlobalVariableTemplatePartialSpecialization.second);
+  }
+
+  void traverseGlobalFunctionTemplateRecords() {
+    for (const auto &GlobalFunctionTemplate : API.getGlobalFunctionTemplates())
+      getDerived()->visitGlobalFunctionTemplateRecord(
+          *GlobalFunctionTemplate.second);
+  }
+
+  void traverseGlobalFunctionTemplateSpecializationRecords() {
+    for (const auto &GlobalFunctionTemplateSpecialization :
+         API.getGlobalFunctionTemplateSpecializations())
+      getDerived()->visitGlobalFunctionTemplateSpecializationRecord(
+          *GlobalFunctionTemplateSpecialization.second);
+  }
+
+  void traverseConcepts() {
+    for (const auto &Concept : API.getConcepts())
+      getDerived()->visitConceptRecord(*Concept.second);
+  }
+
+  void traverseObjCInterfaces() {
+    for (const auto &Interface : API.getObjCInterfaces())
+      getDerived()->visitObjCContainerRecord(*Interface.second);
+  }
+
+  void traverseObjCProtocols() {
+    for (const auto &Protocol : API.getObjCProtocols())
+      getDerived()->visitObjCContainerRecord(*Protocol.second);
+  }
+
+  void traverseObjCCategories() {
+    for (const auto &Category : API.getObjCCategories())
+      getDerived()->visitObjCCategoryRecord(*Category.second);
+  }
+
+  void traverseMacroDefinitionRecords() {
+    for (const auto &Macro : API.getMacros())
+      getDerived()->visitMacroDefinitionRecord(*Macro.second);
+  }
+
+  void traverseTypedefRecords() {
+    for (const auto &Typedef : API.getTypedefs())
+      getDerived()->visitTypedefRecord(*Typedef.second);
+  }
+
+  void visitNamespaceRecord(const NamespaceRecord &Record){};
+
+  /// Visit a global function record.
+  void visitGlobalFunctionRecord(const GlobalFunctionRecord &Record){};
+
+  /// Visit a global variable record.
+  void visitGlobalVariableRecord(const GlobalVariableRecord &Record){};
+
+  /// Visit an enum record.
+  void visitEnumRecord(const EnumRecord &Record){};
+
+  /// Visit a record record.
+  void visitRecordRecord(const RecordRecord &Record){};
+
+  void visitStaticFieldRecord(const StaticFieldRecord &Record){};
+
+  void visitCXXClassRecord(const CXXClassRecord &Record){};
+
+  void visitClassTemplateRecord(const ClassTemplateRecord &Record){};
+
+  void visitClassTemplateSpecializationRecord(
+      const ClassTemplateSpecializationRecord &Record){};
+
+  void visitClassTemplatePartialSpecializationRecord(
+      const ClassTemplatePartialSpecializationRecord &Record){};
+
+  void visitCXXInstanceRecord(const CXXInstanceMethodRecord &Record){};
+
+  void visitCXXStaticRecord(const CXXStaticMethodRecord &Record){};
+
+  void visitMethodTemplateRecord(const CXXMethodTemplateRecord &Record){};
+
+  void visitMethodTemplateSpecializationRecord(
+      const CXXMethodTemplateSpecializationRecord &Record){};
+
+  void visitCXXFieldTemplateRecord(const CXXFieldTemplateRecord &Record){};
+
+  void visitGlobalVariableTemplateRecord(
+      const GlobalVariableTemplateRecord &Record) {}
+
+  void visitGlobalVariableTemplateSpecializationRecord(
+      const GlobalVariableTemplateSpecializationRecord &Record){};
+
+  void visitGlobalVariableTemplatePartialSpecializationRecord(
+      const GlobalVariableTemplatePartialSpecializationRecord &Record){};
+
+  void visitGlobalFunctionTemplateRecord(
+      const GlobalFunctionTemplateRecord &Record){};
+
+  void visitGlobalFunctionTemplateSpecializationRecord(
+      const GlobalFunctionTemplateSpecializationRecord &Record){};
+
+  /// Visit an Objective-C container record.
+  void visitObjCContainerRecord(const ObjCContainerRecord &Record){};
+
+  /// Visit an Objective-C category record.
+  void visitObjCCategoryRecord(const ObjCCategoryRecord &Record){};
+
+  /// Visit a macro definition record.
+  void visitMacroDefinitionRecord(const MacroDefinitionRecord &Record){};
+
+  /// Visit a typedef record.
+  void visitTypedefRecord(const TypedefRecord &Record){};
+
+protected:
+  const APISet &API;
+
+public:
+  APISetVisitor() = delete;
+  APISetVisitor(const APISetVisitor &) = delete;
+  APISetVisitor(APISetVisitor &&) = delete;
+  APISetVisitor &operator=(const APISetVisitor &) = delete;
+  APISetVisitor &operator=(APISetVisitor &&) = delete;
+
+protected:
+  APISetVisitor(const APISet &API) : API(API) {}
+  ~APISetVisitor() = default;
+
+  Derived *getDerived() { return static_cast<Derived *>(this); };
+};
+
+} // namespace extractapi
+} // namespace clang
+
+#endif // LLVM_CLANG_EXTRACTAPI_SERIALIZATION_SERIALIZERBASE_H