--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang-tools-extra/clang-tidy/hicpp/ExceptionBaseclassCheck.cpp	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,66 @@
+//===--- ExceptionBaseclassCheck.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 "ExceptionBaseclassCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace hicpp {
+
+void ExceptionBaseclassCheck::registerMatchers(MatchFinder *Finder) {
+  if (!getLangOpts().CPlusPlus)
+    return;
+
+  Finder->addMatcher(
+      cxxThrowExpr(
+          unless(has(expr(anyOf(isTypeDependent(), isValueDependent())))),
+          // The thrown value is not derived from 'std::exception'.
+          has(expr(unless(
+              hasType(qualType(hasCanonicalType(hasDeclaration(cxxRecordDecl(
+                  isSameOrDerivedFrom(hasName("::std::exception")))))))))),
+          // This condition is always true, but will bind to the
+          // template value if the thrown type is templated.
+          anyOf(has(expr(
+                    hasType(substTemplateTypeParmType().bind("templ_type")))),
+                anything()),
+          // Bind to the declaration of the type of the value that
+          // is thrown. 'anything()' is necessary to always suceed
+          // in the 'eachOf' because builtin types are not
+          // 'namedDecl'.
+          eachOf(has(expr(hasType(namedDecl().bind("decl")))), anything()))
+          .bind("bad_throw"),
+      this);
+}
+
+void ExceptionBaseclassCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *BadThrow = Result.Nodes.getNodeAs<CXXThrowExpr>("bad_throw");
+  assert(BadThrow && "Did not match the throw expression");
+
+  diag(BadThrow->getSubExpr()->getBeginLoc(), "throwing an exception whose "
+                                              "type %0 is not derived from "
+                                              "'std::exception'")
+      << BadThrow->getSubExpr()->getType() << BadThrow->getSourceRange();
+
+  if (const auto *Template =
+          Result.Nodes.getNodeAs<SubstTemplateTypeParmType>("templ_type"))
+    diag(BadThrow->getSubExpr()->getBeginLoc(),
+         "type %0 is a template instantiation of %1", DiagnosticIDs::Note)
+        << BadThrow->getSubExpr()->getType()
+        << Template->getReplacedParameter()->getDecl();
+
+  if (const auto *TypeDecl = Result.Nodes.getNodeAs<NamedDecl>("decl"))
+    diag(TypeDecl->getBeginLoc(), "type defined here", DiagnosticIDs::Note);
+}
+
+} // namespace hicpp
+} // namespace tidy
+} // namespace clang