[clang-tools-extra] [clang-tidy] Unsafe CRTP check (PR #82403)

[via cfe-commits]

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@@ -0,0 +1,171 @@
+//===--- UnsafeCrtpCheck.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 "UnsafeCrtpCheck.h"
+#include "../utils/LexerUtils.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::bugprone {
+
+namespace {
+// Finds a node if it's already a bound node.
+AST_MATCHER_P(CXXRecordDecl, isBoundNode, std::string, ID) {
+  return Builder->removeBindings(
+      [&](const ast_matchers::internal::BoundNodesMap &Nodes) {
+        const auto *BoundRecord = Nodes.getNodeAs<CXXRecordDecl>(ID);
+        return BoundRecord != &Node;
+      });
+}
+
+bool hasPrivateConstructor(const CXXRecordDecl *RD) {
+  for (auto &&Ctor : RD->ctors()) {
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whisperity wrote:

You take by pointer but do not check for nullness before dereferencing. If it is guaranteed and expected that a valid value will be here, consider using a reference instead.

https://github.com/llvm/llvm-project/pull/82403