clang-tidy module: add check for cmStrLen()

Co-Authored-by: Joe Blaauboer <jblaauboer67@gmail.com>

Utilities/ClangTidyModule/CMakeLists.txt

@@ -13,6 +13,9 @@ find_package(Clang REQUIRED)
 
 add_library(cmake-clang-tidy-module MODULE
   Module.cxx
+
+  UseCmstrlenCheck.cxx
+  UseCmstrlenCheck.h
   )
 target_include_directories(cmake-clang-tidy-module PRIVATE ${CLANG_INCLUDE_DIRS})
 target_link_libraries(cmake-clang-tidy-module PRIVATE clang-tidy)

Utilities/ClangTidyModule/Module.cxx

@@ -3,6 +3,8 @@
 #include <clang-tidy/ClangTidyModule.h>
 #include <clang-tidy/ClangTidyModuleRegistry.h>
 
+#include "UseCmstrlenCheck.h"
+
 namespace clang {
 namespace tidy {
 namespace cmake {
@@ -11,7 +13,7 @@ class CMakeClangTidyModule : public ClangTidyModule
 public:
   void addCheckFactories(ClangTidyCheckFactories& CheckFactories) override
   {
-    // TODO
+    CheckFactories.registerCheck<UseCmstrlenCheck>("cmake-use-cmstrlen");
   }
 };
 

Utilities/ClangTidyModule/UseCmstrlenCheck.cxx

@@ -0,0 +1,34 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "UseCmstrlenCheck.h"
+
+#include <clang/ASTMatchers/ASTMatchFinder.h>
+
+namespace clang {
+namespace tidy {
+namespace cmake {
+using namespace ast_matchers;
+
+UseCmstrlenCheck::UseCmstrlenCheck(StringRef Name, ClangTidyContext* Context)
+  : ClangTidyCheck(Name, Context)
+{
+}
+
+void UseCmstrlenCheck::registerMatchers(MatchFinder* Finder)
+{
+  Finder->addMatcher(callExpr(callee(functionDecl(hasName("::strlen"))),
+                              callee(expr().bind("callee")),
+                              hasArgument(0, stringLiteral())),
+                     this);
+}
+
+void UseCmstrlenCheck::check(const MatchFinder::MatchResult& Result)
+{
+  const Expr* Node = Result.Nodes.getNodeAs<Expr>("callee");
+
+  this->diag(Node->getBeginLoc(), "use cmStrLen() for string literals")
+    << FixItHint::CreateReplacement(Node->getSourceRange(), "cmStrLen");
+}
+}
+}
+}

Utilities/ClangTidyModule/UseCmstrlenCheck.h

@@ -0,0 +1,21 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#pragma once
+
+#include <clang-tidy/ClangTidyCheck.h>
+#include <clang/ASTMatchers/ASTMatchFinder.h>
+
+namespace clang {
+namespace tidy {
+namespace cmake {
+class UseCmstrlenCheck : public ClangTidyCheck
+{
+public:
+  UseCmstrlenCheck(StringRef Name, ClangTidyContext* Context);
+  void registerMatchers(ast_matchers::MatchFinder* Finder) override;
+
+  void check(const ast_matchers::MatchFinder::MatchResult& Result) override;
+};
+}
+}
+}