[clang-tidy] Add a flag to enable alpha checkers

Summary: The alpha checkers can already be enabled using the clang driver, this allows them to be enabled using the clang-tidy as well. This can make it easier to test the alpha checkers with projects which already support the compile_commands.json. It will also allow more people to give feedback and patches about the alpha checkers since they can run it as part of clang tidy checks.

Reviewers: aaron.ballman, hokein, ilya-biryukov, alexfh, lebedev.ri, xbolva00

Reviewed By: aaron.ballman, alexfh, lebedev.ri, xbolva00

Subscribers: xbolva00, NoQ, dcoughlin, lebedev.ri, xazax.hun, cfe-commits

Patch by Paul Fultz II!

Differential Revision: https://reviews.llvm.org/D46159

llvm-svn: 332609

6 files changed, 56 insertions, 16 deletions

diff --git a/clang-tools-extra/clang-tidy/ClangTidy.cpp b/clang-tools-extra/clang-tidy/ClangTidy.cpp
index 1493fbbd247..ff205edd3ab 100644
--- a/clang-tools-extra/clang-tidy/ClangTidy.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidy.cpp
@@ -309,11 +309,12 @@ static void setStaticAnalyzerCheckerOpts(const ClangTidyOptions &Opts,
 
 typedef std::vector<std::pair<std::string, bool>> CheckersList;
 
-static CheckersList getCheckersControlList(ClangTidyContext &Context) {
+static CheckersList getCheckersControlList(ClangTidyContext &Context,
+                                           bool IncludeExperimental) {
   CheckersList List;
 
   const auto &RegisteredCheckers =
-      AnalyzerOptions::getRegisteredCheckers(/*IncludeExperimental=*/false);
+      AnalyzerOptions::getRegisteredCheckers(IncludeExperimental);
   bool AnalyzerChecksEnabled = false;
   for (StringRef CheckName : RegisteredCheckers) {
     std::string ClangTidyCheckName((AnalyzerCheckNamePrefix + CheckName).str());
@@ -379,7 +380,8 @@ ClangTidyASTConsumerFactory::CreateASTConsumer(
     Consumers.push_back(Finder->newASTConsumer());
 
   AnalyzerOptionsRef AnalyzerOptions = Compiler.getAnalyzerOpts();
-  AnalyzerOptions->CheckersControlList = getCheckersControlList(Context);
+  AnalyzerOptions->CheckersControlList =
+      getCheckersControlList(Context, Context.canEnableAnalyzerAlphaCheckers());
   if (!AnalyzerOptions->CheckersControlList.empty()) {
     setStaticAnalyzerCheckerOpts(Context.getOptions(), AnalyzerOptions);
     AnalyzerOptions->AnalysisStoreOpt = RegionStoreModel;
@@ -404,7 +406,8 @@ std::vector<std::string> ClangTidyASTConsumerFactory::getCheckNames() {
       CheckNames.push_back(CheckFactory.first);
   }
 
-  for (const auto &AnalyzerCheck : getCheckersControlList(Context))
+  for (const auto &AnalyzerCheck : getCheckersControlList(
+           Context, Context.canEnableAnalyzerAlphaCheckers()))
     CheckNames.push_back(AnalyzerCheckNamePrefix + AnalyzerCheck.first);
 
   std::sort(CheckNames.begin(), CheckNames.end());
@@ -463,18 +466,24 @@ void OptionsView::store(ClangTidyOptions::OptionMap &Options,
   store(Options, LocalName, llvm::itostr(Value));
 }
 
-std::vector<std::string> getCheckNames(const ClangTidyOptions &Options) {
+std::vector<std::string>
+getCheckNames(const ClangTidyOptions &Options,
+              bool AllowEnablingAnalyzerAlphaCheckers) {
   clang::tidy::ClangTidyContext Context(
       llvm::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(),
-                                                Options));
+                                                Options),
+      AllowEnablingAnalyzerAlphaCheckers);
   ClangTidyASTConsumerFactory Factory(Context);
   return Factory.getCheckNames();
 }
 
-ClangTidyOptions::OptionMap getCheckOptions(const ClangTidyOptions &Options) {
+ClangTidyOptions::OptionMap
+getCheckOptions(const ClangTidyOptions &Options,
+                bool AllowEnablingAnalyzerAlphaCheckers) {
   clang::tidy::ClangTidyContext Context(
       llvm::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(),
-                                                Options));
+                                                Options),
+      AllowEnablingAnalyzerAlphaCheckers);
   ClangTidyASTConsumerFactory Factory(Context);
   return Factory.getCheckOptions();
 }
diff --git a/clang-tools-extra/clang-tidy/ClangTidy.h b/clang-tools-extra/clang-tidy/ClangTidy.h
index 05576e0edef..4ee38a04ec0 100644
--- a/clang-tools-extra/clang-tidy/ClangTidy.h
+++ b/clang-tools-extra/clang-tidy/ClangTidy.h
@@ -210,7 +210,8 @@ private:
 
 /// \brief Fills the list of check names that are enabled when the provided
 /// filters are applied.
-std::vector<std::string> getCheckNames(const ClangTidyOptions &Options);
+std::vector<std::string> getCheckNames(const ClangTidyOptions &Options,
+                                       bool AllowEnablingAnalyzerAlphaCheckers);
 
 /// \brief Returns the effective check-specific options.
 ///
@@ -218,7 +219,9 @@ std::vector<std::string> getCheckNames(const ClangTidyOptions &Options);
 /// effective options from all created checks. The returned set of options
 /// includes default check-specific options for all keys not overridden by \p
 /// Options.
-ClangTidyOptions::OptionMap getCheckOptions(const ClangTidyOptions &Options);
+ClangTidyOptions::OptionMap
+getCheckOptions(const ClangTidyOptions &Options,
+                bool AllowEnablingAnalyzerAlphaCheckers);
 
 /// \brief Run a set of clang-tidy checks on a set of files.
 ///
diff --git a/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp b/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp
index dd4f6584e03..a29deb4980b 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp
+++ b/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.cpp
@@ -177,9 +177,11 @@ private:
 };
 
 ClangTidyContext::ClangTidyContext(
-    std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider)
+    std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider,
+    bool AllowEnablingAnalyzerAlphaCheckers)
     : DiagEngine(nullptr), OptionsProvider(std::move(OptionsProvider)),
-      Profile(false) {
+      Profile(false),
+      AllowEnablingAnalyzerAlphaCheckers(AllowEnablingAnalyzerAlphaCheckers) {
   // Before the first translation unit we can get errors related to command-line
   // parsing, use empty string for the file name in this case.
   setCurrentFile("");
diff --git a/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h b/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h
index 60e5040a7ae..d640de4f006 100644
--- a/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h
+++ b/clang-tools-extra/clang-tidy/ClangTidyDiagnosticConsumer.h
@@ -99,7 +99,8 @@ struct ClangTidyStats {
 class ClangTidyContext {
 public:
   /// \brief Initializes \c ClangTidyContext instance.
-  ClangTidyContext(std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider);
+  ClangTidyContext(std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider,
+                   bool AllowEnablingAnalyzerAlphaCheckers = false);
 
   ~ClangTidyContext();
 
@@ -178,6 +179,12 @@ public:
     return CurrentBuildDirectory;
   }
 
+  /// \brief If the experimental alpha checkers from the static analyzer can be
+  /// enabled.
+  bool canEnableAnalyzerAlphaCheckers() const {
+    return AllowEnablingAnalyzerAlphaCheckers;
+  }
+
 private:
   // Calls setDiagnosticsEngine() and storeError().
   friend class ClangTidyDiagnosticConsumer;
@@ -209,6 +216,8 @@ private:
   llvm::DenseMap<unsigned, std::string> CheckNamesByDiagnosticID;
 
   bool Profile;
+
+  bool AllowEnablingAnalyzerAlphaCheckers;
 };
 
 /// \brief A diagnostic consumer that turns each \c Diagnostic into a
diff --git a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
index 07accbbcea9..97a5a27f9ae 100644
--- a/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
+++ b/clang-tools-extra/clang-tidy/tool/ClangTidyMain.cpp
@@ -181,6 +181,14 @@ report to stderr.
                                         cl::init(false),
                                         cl::cat(ClangTidyCategory));
 
+/// This option allows enabling the experimental alpha checkers from the static
+/// analyzer. This option is set to false and not visible in help, because it is
+/// highly not recommended for users.
+static cl::opt<bool>
+    AllowEnablingAnalyzerAlphaCheckers("allow-enabling-analyzer-alpha-checkers",
+                                       cl::init(false), cl::Hidden,
+                                       cl::cat(ClangTidyCategory));
+
 static cl::opt<std::string> ExportFixes("export-fixes", cl::desc(R"(
 YAML file to store suggested fixes in. The
 stored fixes can be applied to the input source
@@ -335,7 +343,8 @@ static int clangTidyMain(int argc, const char **argv) {
                  << EC.message() << "\n";
   }
   ClangTidyOptions EffectiveOptions = OptionsProvider->getOptions(FilePath);
-  std::vector<std::string> EnabledChecks = getCheckNames(EffectiveOptions);
+  std::vector<std::string> EnabledChecks =
+      getCheckNames(EffectiveOptions, AllowEnablingAnalyzerAlphaCheckers);
 
   if (ExplainConfig) {
     // FIXME: Show other ClangTidyOptions' fields, like ExtraArg.
@@ -366,7 +375,8 @@ static int clangTidyMain(int argc, const char **argv) {
   }
 
   if (DumpConfig) {
-    EffectiveOptions.CheckOptions = getCheckOptions(EffectiveOptions);
+    EffectiveOptions.CheckOptions =
+        getCheckOptions(EffectiveOptions, AllowEnablingAnalyzerAlphaCheckers);
     llvm::outs() << configurationAsText(
                         ClangTidyOptions::getDefaults().mergeWith(
                             EffectiveOptions))
@@ -390,7 +400,8 @@ static int clangTidyMain(int argc, const char **argv) {
   llvm::InitializeAllTargetMCs();
   llvm::InitializeAllAsmParsers();
 
-  ClangTidyContext Context(std::move(OwningOptionsProvider));
+  ClangTidyContext Context(std::move(OwningOptionsProvider),
+                           AllowEnablingAnalyzerAlphaCheckers);
   runClangTidy(Context, OptionsParser.getCompilations(), PathList, BaseFS,
                EnableCheckProfile);
   ArrayRef<ClangTidyError> Errors = Context.getErrors();
diff --git a/clang-tools-extra/test/clang-tidy/enable-alpha-checks.cpp b/clang-tools-extra/test/clang-tidy/enable-alpha-checks.cpp
new file mode 100644
index 00000000000..b1e51303498
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/enable-alpha-checks.cpp
@@ -0,0 +1,6 @@
+// Check if '-allow-enabling-analyzer-alpha-checkers' is visible for users.
+// RUN: clang-tidy -help | not grep 'allow-enabling-analyzer-alpha-checkers'
+
+// Check if '-allow-enabling-analyzer-alpha-checkers' enables alpha checks.
+// RUN: clang-tidy -checks=* -list-checks | not grep 'clang-analyzer-alpha'
+// RUN: clang-tidy -checks=* -list-checks -allow-enabling-analyzer-alpha-checkers | grep 'clang-analyzer-alpha'