clang-tidy: write a lint for charptr_cast

This lets us ensure that nobody is putting in new reinterpret_cast
instances where they could safely use charptr_cast instead.

Change-Id: I6358a3934c8133c7150042635843bdbb6b9218d4

1 files changed, 32 insertions, 0 deletions

diff --git a/subprojects/lix-clang-tidy/CharPtrCast.hh b/subprojects/lix-clang-tidy/CharPtrCast.hh
new file mode 100644
index 000000000..66883d055
--- /dev/null
+++ b/subprojects/lix-clang-tidy/CharPtrCast.hh
@@ -0,0 +1,32 @@
+#pragma once
+///@file
+
+#include <clang-tidy/ClangTidyCheck.h>
+#include <clang-tidy/utils/IncludeInserter.h>
+#include <clang/ASTMatchers/ASTMatchFinder.h>
+#include <llvm/ADT/StringRef.h>
+
+namespace nix::clang_tidy {
+
+using namespace clang;
+using namespace clang::tidy;
+
+class CharPtrCastCheck : public ClangTidyCheck {
+  tidy::utils::IncludeInserter Inserter{
+      Options.getLocalOrGlobal("IncludeStyle",
+                               tidy::utils::IncludeSorter::IS_Google),
+      false};
+
+public:
+  CharPtrCastCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+
+  void registerPPCallbacks(const SourceManager &, Preprocessor *PP,
+                           Preprocessor *) override {
+    Inserter.registerPreprocessor(PP);
+  }
+
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+} // namespace nix::clang_tidy