1 files changed, 59 insertions, 0 deletions
diff --git a/clang-tools-extra/clang-tidy/bugprone/ForwardDeclarationNamespaceCheck.h b/clang-tools-extra/clang-tidy/bugprone/ForwardDeclarationNamespaceCheck.h
new file mode 100644
index 00000000000..c3d30186895
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+++ b/clang-tools-extra/clang-tidy/bugprone/ForwardDeclarationNamespaceCheck.h
@@ -0,0 +1,59 @@
+//===--- ForwardDeclarationNamespaceCheck.h - clang-tidy --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_FORWARDDECLARATIONNAMESPACECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_FORWARDDECLARATIONNAMESPACECHECK_H
+
+#include "../ClangTidy.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include <set>
+#include <vector>
+
+namespace clang {
+namespace tidy {
+namespace bugprone {
+
+/// Checks if an unused forward declaration is in a wrong namespace.
+///
+/// The check inspects all unused forward declarations and checks if there is
+/// any declaration/definition with the same name, which could indicate
+/// that the forward declaration is potentially in a wrong namespace.
+///
+/// \code
+///   namespace na { struct A; }
+///   namespace nb { struct A {} };
+///   nb::A a;
+///   // warning : no definition found for 'A', but a definition with the same
+///   name 'A' found in another namespace 'nb::'
+/// \endcode
+///
+/// This check can only generate warnings, but it can't suggest fixes at this
+/// point.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone-forward-declaration-namespace.html
+class ForwardDeclarationNamespaceCheck : public ClangTidyCheck {
+public:
+  ForwardDeclarationNamespaceCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+  void onEndOfTranslationUnit() override;
+
+private:
+  llvm::StringMap<std::vector<const CXXRecordDecl *>> DeclNameToDefinitions;
+  llvm::StringMap<std::vector<const CXXRecordDecl *>> DeclNameToDeclarations;
+  llvm::SmallPtrSet<const Type *, 16> FriendTypes;
+};
+
+} // namespace bugprone
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_FORWARDDECLARATIONNAMESPACECHECK_H