================
@@ -0,0 +1,80 @@
+//===--- UnnecessaryExternalLinkageCheck.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 "UnnecessaryExternalLinkageCheck.h"
+#include "clang/AST/Decl.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/ASTMatchers/ASTMatchersMacros.h"
+#include "clang/Basic/Specifiers.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::readability {
+
+namespace {
+
+AST_POLYMORPHIC_MATCHER(isFirstDecl,
+ AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl,
+ VarDecl)) {
+ return Node.isFirstDecl();
+}
+
+AST_MATCHER(Decl, isInMainFile) {
+ for (const Decl *D : Node.redecls())
+ if (!Finder->getASTContext().getSourceManager().isInMainFile(
+ D->getLocation()))
+ return false;
+ return true;
+}
+
+AST_POLYMORPHIC_MATCHER(isExternStorageClass,
+ AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl,
+ VarDecl)) {
+ return Node.getStorageClass() == SC_Extern;
+}
+
+} // namespace
+
+void UnnecessaryExternalLinkageCheck::registerMatchers(MatchFinder *Finder) {
+ auto Common = allOf(isFirstDecl(), isInMainFile(),
+ unless(anyOf(
+ // 1. internal linkage
+ isStaticStorageClass(), isInAnonymousNamespace(),
+ // 2. explicit external linkage
+ isExternStorageClass(), isExternC(),
+ // 3. template
+ isExplicitTemplateSpecialization(),
+ clang::ast_matchers::isTemplateInstantiation(),
+ // 4. friend
+ hasAncestor(friendDecl()))));
+ Finder->addMatcher(
+ functionDecl(Common, unless(cxxMethodDecl()), unless(isMain()))
+ .bind("fn"),
+ this);
+ Finder->addMatcher(varDecl(Common, hasGlobalStorage()).bind("var"), this);
+}
+
+static constexpr StringRef Message =
+ "%0 %1 can be internal linkage, "
+ "marking as static or using anonymous namespace can avoid external "
+ "linkage.";
----------------
SimplyDanny wrote:
A bit shorter:
```suggestion
"%0 %1 can be made static or moved into an anonymous "
"namespace to enforce internal linkage";
```
https://github.com/llvm/llvm-project/pull/90830
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