================
@@ -0,0 +1,78 @@
+//===--- UseInternalLinkageCheck.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 "UseInternalLinkageCheck.h"
+#include "../utils/FileExtensionsUtils.h"
+#include "clang/AST/Decl.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/ASTMatchers/ASTMatchersMacros.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/Specifiers.h"
+#include "llvm/ADT/STLExtras.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::misc {
+
+namespace {
+
+AST_MATCHER(Decl, isFirstDecl) { return Node.isFirstDecl(); }
+
+AST_MATCHER_P(Decl, isInMainFile, FileExtensionsSet, HeaderFileExtensions) {
+ return llvm::all_of(Node.redecls(), [&](const Decl *D) {
+ SourceManager &SM = Finder->getASTContext().getSourceManager();
+ const SourceLocation L = D->getLocation();
+ return SM.isInMainFile(L) &&
+ !utils::isSpellingLocInHeaderFile(L, SM, HeaderFileExtensions);
+ });
+}
+
+AST_POLYMORPHIC_MATCHER(isExternStorageClass,
+ AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl,
+ VarDecl)) {
+ return Node.getStorageClass() == SC_Extern;
+}
+
+} // namespace
+
+void UseInternalLinkageCheck::registerMatchers(MatchFinder *Finder) {
+ auto Common = allOf(isFirstDecl(), isInMainFile(HeaderFileExtensions),
----------------
PiotrZSL wrote:
isFirstDecl wont work if someone do:
```
void foo()
{
}
#include "foo.h"
```
but thats, fine, just would be good if documentation mention that it checks
first declaration
https://github.com/llvm/llvm-project/pull/90830
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