--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/lib/AST/ASTConsumer.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,30 @@
+//===--- ASTConsumer.cpp - Abstract interface for reading ASTs --*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the ASTConsumer class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclGroup.h"
+using namespace clang;
+
+bool ASTConsumer::HandleTopLevelDecl(DeclGroupRef D) {
+  return true;
+}
+
+void ASTConsumer::HandleInterestingDecl(DeclGroupRef D) {
+  HandleTopLevelDecl(D);
+}
+
+void ASTConsumer::HandleTopLevelDeclInObjCContainer(DeclGroupRef D) {}
+
+void ASTConsumer::HandleImplicitImportDecl(ImportDecl *D) {
+  HandleTopLevelDecl(DeclGroupRef(D));
+}