--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang-tools-extra/clang-tidy/readability/StaticDefinitionInAnonymousNamespaceCheck.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,65 @@
+//===--- StaticDefinitionInAnonymousNamespaceCheck.cpp - clang-tidy--------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "StaticDefinitionInAnonymousNamespaceCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace readability {
+
+void StaticDefinitionInAnonymousNamespaceCheck::registerMatchers(
+    MatchFinder *Finder) {
+  Finder->addMatcher(
+      namedDecl(anyOf(functionDecl(isDefinition(), isStaticStorageClass()),
+                      varDecl(isDefinition(), isStaticStorageClass())),
+                hasParent(namespaceDecl(isAnonymous())))
+          .bind("static-def"),
+      this);
+}
+
+void StaticDefinitionInAnonymousNamespaceCheck::check(
+    const MatchFinder::MatchResult &Result) {
+  const auto *Def = Result.Nodes.getNodeAs<NamedDecl>("static-def");
+  // Skips all static definitions defined in Macro.
+  if (Def->getLocation().isMacroID())
+    return;
+
+  // Skips all static definitions in function scope.
+  const DeclContext *DC = Def->getDeclContext();
+  if (DC->getDeclKind() != Decl::Namespace)
+    return;
+
+  auto Diag =
+      diag(Def->getLocation(), "%0 is a static definition in "
+                               "anonymous namespace; static is redundant here")
+      << Def;
+  Token Tok;
+  SourceLocation Loc = Def->getSourceRange().getBegin();
+  while (Loc < Def->getSourceRange().getEnd() &&
+         !Lexer::getRawToken(Loc, Tok, *Result.SourceManager, getLangOpts(),
+                             true)) {
+    SourceRange TokenRange(Tok.getLocation(), Tok.getEndLoc());
+    StringRef SourceText =
+        Lexer::getSourceText(CharSourceRange::getTokenRange(TokenRange),
+                             *Result.SourceManager, getLangOpts());
+    if (SourceText == "static") {
+      Diag << FixItHint::CreateRemoval(TokenRange);
+      break;
+    }
+    Loc = Tok.getEndLoc();
+  }
+}
+
+} // namespace readability
+} // namespace tidy
+} // namespace clang