Expose language options to the checkers; disable UseNullptrCheck when not compiling in C++11 mode.

llvm-svn: 246209

clang-tools-extra/clang-tidy/ClangTidy.h

@@ -158,6 +158,8 @@ protected:
   OptionsView Options;
   /// \brief Returns the main file name of the current translation unit.
   StringRef getCurrentMainFile() const { return Context->getCurrentFile(); }
+  /// \brief Returns the language options from the context.
+  LangOptions getLangOpts() const { return Context->getLangOpts(); }
 };
 
 class ClangTidyCheckFactories;

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp

@@ -212,6 +212,7 @@ void ClangTidyContext::setCurrentFile(StringRef File) {
 
 void ClangTidyContext::setASTContext(ASTContext *Context) {
   DiagEngine->SetArgToStringFn(&FormatASTNodeDiagnosticArgument, Context);
+  LangOpts = Context->getLangOpts();
 }
 
 const ClangTidyGlobalOptions &ClangTidyContext::getGlobalOptions() const {

clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h

@@ -149,6 +149,9 @@ public:
   /// \brief Sets ASTContext for the current translation unit.
   void setASTContext(ASTContext *Context);
 
+  /// \brief Gets the language options from the AST context
+  LangOptions getLangOpts() const { return LangOpts; }
+
   /// \brief Returns the name of the clang-tidy check which produced this
   /// diagnostic ID.
   StringRef getCheckName(unsigned DiagnosticID) const;
@@ -198,6 +201,8 @@ private:
   ClangTidyOptions CurrentOptions;
   std::unique_ptr<GlobList> CheckFilter;
 
+  LangOptions LangOpts;
+
   ClangTidyStats Stats;
 
   llvm::DenseMap<unsigned, std::string> CheckNamesByDiagnosticID;

clang-tools-extra/clang-tidy/modernize/UseNullptrCheck.cpp

@@ -453,7 +453,9 @@ void UseNullptrCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
 }
 
 void UseNullptrCheck::registerMatchers(MatchFinder *Finder) {
-  Finder->addMatcher(makeCastSequenceMatcher(), this);
+  // Only register the matcher for C++11.
+  if (getLangOpts().CPlusPlus11)
+    Finder->addMatcher(makeCastSequenceMatcher(), this);
 }
 
 void UseNullptrCheck::check(const MatchFinder::MatchResult &Result) {

clang-tools-extra/test/clang-tidy/modernize-use-nullptr.c

@@ -0,0 +1,10 @@
+// RUN: clang-tidy %s -checks=-*,modernize-use-nullptr -- | count 0
+
+// Note: this test expects no diagnostics, but FileCheck cannot handle that,
+// hence the use of | count 0.
+
+#define NULL 0
+void f(void) {
+  char *str = NULL; // ok
+  (void)str;
+}