reapply "[clang-tidy] support query based custom check"

clang-tools-extra/CMakeLists.txt

@@ -5,6 +5,8 @@ include(GNUInstallDirs)
 
 option(CLANG_TIDY_ENABLE_STATIC_ANALYZER
   "Include static analyzer checks in clang-tidy" ON)
+option(CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS
+  "Enable query-based custom checks in clang-tidy" ON)
 
 if(CLANG_INCLUDE_TESTS)
   umbrella_lit_testsuite_begin(check-clang-tools)

clang-tools-extra/clang-tidy/CMakeLists.txt

@@ -58,6 +58,7 @@ add_subdirectory(bugprone)
 add_subdirectory(cert)
 add_subdirectory(concurrency)
 add_subdirectory(cppcoreguidelines)
+add_subdirectory(custom)
 add_subdirectory(darwin)
 add_subdirectory(fuchsia)
 add_subdirectory(google)
@@ -101,6 +102,10 @@ set(ALL_CLANG_TIDY_CHECKS
   clangTidyReadabilityModule
   clangTidyZirconModule
   )
+
+if(CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS)
+  list(APPEND ALL_CLANG_TIDY_CHECKS clangTidyCustomModule)
+endif()
 if(CLANG_TIDY_ENABLE_STATIC_ANALYZER)
   list(APPEND ALL_CLANG_TIDY_CHECKS clangTidyMPIModule)
 endif()

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

@@ -53,6 +53,13 @@ LLVM_INSTANTIATE_REGISTRY(clang::tidy::ClangTidyModuleRegistry)
 
 namespace clang::tidy {
 
+#if CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS
+namespace custom {
+void (*RegisterCustomChecks)(const ClangTidyOptions &O,
+                             ClangTidyCheckFactories &Factories) = nullptr;
+} // namespace custom
+#endif
+
 namespace {
 #if CLANG_TIDY_ENABLE_STATIC_ANALYZER
 #define ANALYZER_CHECK_NAME_PREFIX "clang-analyzer-"
@@ -342,6 +349,10 @@ ClangTidyASTConsumerFactory::ClangTidyASTConsumerFactory(
     IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFS)
     : Context(Context), OverlayFS(std::move(OverlayFS)),
       CheckFactories(new ClangTidyCheckFactories) {
+#if CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS
+  if (Context.canExperimentalCustomChecks() && custom::RegisterCustomChecks)
+    custom::RegisterCustomChecks(Context.getOptions(), *CheckFactories);
+#endif
   for (ClangTidyModuleRegistry::entry E : ClangTidyModuleRegistry::entries()) {
     std::unique_ptr<ClangTidyModule> Module = E.instantiate();
     Module->addCheckFactories(*CheckFactories);
@@ -411,7 +422,10 @@ ClangTidyASTConsumerFactory::createASTConsumer(
                         .getCurrentWorkingDirectory();
   if (WorkingDir)
     Context.setCurrentBuildDirectory(WorkingDir.get());
-
+#if CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS
+  if (Context.canExperimentalCustomChecks() && custom::RegisterCustomChecks)
+    custom::RegisterCustomChecks(Context.getOptions(), *CheckFactories);
+#endif
   std::vector<std::unique_ptr<ClangTidyCheck>> Checks =
       CheckFactories->createChecksForLanguage(&Context);
 
@@ -497,13 +511,13 @@ ClangTidyOptions::OptionMap ClangTidyASTConsumerFactory::getCheckOptions() {
   return Options;
 }
 
-std::vector<std::string>
-getCheckNames(const ClangTidyOptions &Options,
-              bool AllowEnablingAnalyzerAlphaCheckers) {
+std::vector<std::string> getCheckNames(const ClangTidyOptions &Options,
+                                       bool AllowEnablingAnalyzerAlphaCheckers,
+                                       bool ExperimentalCustomChecks) {
   clang::tidy::ClangTidyContext Context(
       std::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(),
                                                Options),
-      AllowEnablingAnalyzerAlphaCheckers);
+      AllowEnablingAnalyzerAlphaCheckers, false, ExperimentalCustomChecks);
   ClangTidyASTConsumerFactory Factory(Context);
   return Factory.getCheckNames();
 }
@@ -524,11 +538,12 @@ void filterCheckOptions(ClangTidyOptions &Options,
 
 ClangTidyOptions::OptionMap
 getCheckOptions(const ClangTidyOptions &Options,
-                bool AllowEnablingAnalyzerAlphaCheckers) {
+                bool AllowEnablingAnalyzerAlphaCheckers,
+                bool ExperimentalCustomChecks) {
   clang::tidy::ClangTidyContext Context(
       std::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(),
                                                Options),
-      AllowEnablingAnalyzerAlphaCheckers);
+      AllowEnablingAnalyzerAlphaCheckers, false, ExperimentalCustomChecks);
   ClangTidyDiagnosticConsumer DiagConsumer(Context);
   auto DiagOpts = std::make_unique<DiagnosticOptions>();
   DiagnosticsEngine DE(llvm::makeIntrusiveRefCnt<DiagnosticIDs>(), *DiagOpts,
@@ -665,15 +680,19 @@ void exportReplacements(const llvm::StringRef MainFilePath,
   YAML << TUD;
 }
 
-ChecksAndOptions
-getAllChecksAndOptions(bool AllowEnablingAnalyzerAlphaCheckers) {
+ChecksAndOptions getAllChecksAndOptions(bool AllowEnablingAnalyzerAlphaCheckers,
+                                        bool ExperimentalCustomChecks) {
   ChecksAndOptions Result;
   ClangTidyOptions Opts;
   Opts.Checks = "*";
   clang::tidy::ClangTidyContext Context(
       std::make_unique<DefaultOptionsProvider>(ClangTidyGlobalOptions(), Opts),
-      AllowEnablingAnalyzerAlphaCheckers);
+      AllowEnablingAnalyzerAlphaCheckers, false, ExperimentalCustomChecks);
   ClangTidyCheckFactories Factories;
+#if CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS
+  if (ExperimentalCustomChecks && custom::RegisterCustomChecks)
+    custom::RegisterCustomChecks(Context.getOptions(), Factories);
+#endif
   for (const ClangTidyModuleRegistry::entry &Module :
        ClangTidyModuleRegistry::entries()) {
     Module.instantiate()->addCheckFactories(Factories);

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

@@ -56,15 +56,16 @@ class ClangTidyASTConsumerFactory {
 /// Fills the list of check names that are enabled when the provided
 /// filters are applied.
 std::vector<std::string> getCheckNames(const ClangTidyOptions &Options,
-                                       bool AllowEnablingAnalyzerAlphaCheckers);
+                                       bool AllowEnablingAnalyzerAlphaCheckers,
+                                       bool ExperimentalCustomChecks);
 
 struct ChecksAndOptions {
   llvm::StringSet<> Checks;
   llvm::StringSet<> Options;
 };
 
-ChecksAndOptions
-getAllChecksAndOptions(bool AllowEnablingAnalyzerAlphaCheckers = true);
+ChecksAndOptions getAllChecksAndOptions(bool AllowEnablingAnalyzerAlphaCheckers,
+                                        bool ExperimentalCustomChecks);
 
 /// Returns the effective check-specific options.
 ///
@@ -74,7 +75,8 @@ getAllChecksAndOptions(bool AllowEnablingAnalyzerAlphaCheckers = true);
 /// Options.
 ClangTidyOptions::OptionMap
 getCheckOptions(const ClangTidyOptions &Options,
-                bool AllowEnablingAnalyzerAlphaCheckers);
+                bool AllowEnablingAnalyzerAlphaCheckers,
+                bool ExperimentalCustomChecks);
 
 /// Filters CheckOptions in \p Options to only include options specified in
 /// the \p EnabledChecks which is a sorted vector.
@@ -125,6 +127,10 @@ void exportReplacements(StringRef MainFilePath,
                         const std::vector<ClangTidyError> &Errors,
                         raw_ostream &OS);
 
+namespace custom {
+extern void (*RegisterCustomChecks)(const ClangTidyOptions &O,
+                                    ClangTidyCheckFactories &Factories);
+} // namespace custom
 } // end namespace tidy
 } // end namespace clang
 

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

@@ -160,11 +160,12 @@ ClangTidyError::ClangTidyError(StringRef CheckName,
 
 ClangTidyContext::ClangTidyContext(
     std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider,
-    bool AllowEnablingAnalyzerAlphaCheckers, bool EnableModuleHeadersParsing)
+    bool AllowEnablingAnalyzerAlphaCheckers, bool EnableModuleHeadersParsing,
+    bool ExperimentalCustomChecks)
     : OptionsProvider(std::move(OptionsProvider)),
-
       AllowEnablingAnalyzerAlphaCheckers(AllowEnablingAnalyzerAlphaCheckers),
-      EnableModuleHeadersParsing(EnableModuleHeadersParsing) {
+      EnableModuleHeadersParsing(EnableModuleHeadersParsing),
+      ExperimentalCustomChecks(ExperimentalCustomChecks) {
   // Before the first translation unit we can get errors related to command-line
   // parsing, use dummy string for the file name in this case.
   setCurrentFile("dummy");

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

@@ -19,6 +19,7 @@
 #include "llvm/ADT/StringSet.h"
 #include "llvm/Support/Regex.h"
 #include <optional>
+#include <utility>
 
 namespace clang {
 
@@ -68,10 +69,13 @@ struct ClangTidyStats {
 /// \endcode
 class ClangTidyContext {
 public:
+  ClangTidyContext(std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider)
+      : ClangTidyContext(std::move(OptionsProvider), false, false, false) {}
   /// Initializes \c ClangTidyContext instance.
   ClangTidyContext(std::unique_ptr<ClangTidyOptionsProvider> OptionsProvider,
-                   bool AllowEnablingAnalyzerAlphaCheckers = false,
-                   bool EnableModuleHeadersParsing = false);
+                   bool AllowEnablingAnalyzerAlphaCheckers,
+                   bool EnableModuleHeadersParsing,
+                   bool ExperimentalCustomChecks);
   /// Sets the DiagnosticsEngine that diag() will emit diagnostics to.
   // FIXME: this is required initialization, and should be a constructor param.
   // Fix the context -> diag engine -> consumer -> context initialization cycle.
@@ -210,6 +214,10 @@ class ClangTidyContext {
     return EnableModuleHeadersParsing;
   }
 
+  // whether experimental custom checks can be enabled.
+  // enabled with `--experimental-custom-checks`
+  bool canExperimentalCustomChecks() const { return ExperimentalCustomChecks; }
+
   void setSelfContainedDiags(bool Value) { SelfContainedDiags = Value; }
 
   bool areDiagsSelfContained() const { return SelfContainedDiags; }
@@ -258,6 +266,7 @@ class ClangTidyContext {
 
   bool AllowEnablingAnalyzerAlphaCheckers;
   bool EnableModuleHeadersParsing;
+  bool ExperimentalCustomChecks;
 
   bool SelfContainedDiags = false;
 

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

@@ -54,6 +54,13 @@ extern volatile int CppCoreGuidelinesModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED CppCoreGuidelinesModuleAnchorDestination =
     CppCoreGuidelinesModuleAnchorSource;
 
+#if CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS
+// This anchor is used to force the linker to link the CustomModule.
+extern volatile int CustomModuleAnchorSource;
+static int LLVM_ATTRIBUTE_UNUSED CustomModuleAnchorDestination =
+    CustomModuleAnchorSource;
+#endif
+
 // This anchor is used to force the linker to link the DarwinModule.
 extern volatile int DarwinModuleAnchorSource;
 static int LLVM_ATTRIBUTE_UNUSED DarwinModuleAnchorDestination =

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

@@ -62,6 +62,8 @@ class ClangTidyCheckFactories {
                          });
   }
 
+  void eraseCheck(llvm::StringRef CheckName) { Factories.erase(CheckName); }
+
   /// Create instances of checks that are enabled.
   std::vector<std::unique_ptr<ClangTidyCheck>>
   createChecks(ClangTidyContext *Context) const;

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

@@ -8,8 +8,10 @@
 
 #include "ClangTidyOptions.h"
 #include "ClangTidyModuleRegistry.h"
+#include "clang/Basic/DiagnosticIDs.h"
 #include "clang/Basic/LLVM.h"
 #include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorOr.h"
 #include "llvm/Support/MemoryBufferRef.h"
@@ -129,6 +131,51 @@ void yamlize(IO &IO, ClangTidyOptions::OptionMap &Val, bool,
   }
 }
 
+namespace {
+struct MultiLineString {
+  std::string &S;
+};
+} // namespace
+
+template <> struct BlockScalarTraits<MultiLineString> {
+  static void output(const MultiLineString &S, void *Ctxt, raw_ostream &OS) {
+    OS << S.S;
+  }
+  static StringRef input(StringRef Str, void *Ctxt, MultiLineString &S) {
+    S.S = Str;
+    return "";
+  }
+};
+
+template <> struct ScalarEnumerationTraits<clang::DiagnosticIDs::Level> {
+  static void enumeration(IO &IO, clang::DiagnosticIDs::Level &Level) {
+    IO.enumCase(Level, "Warning", clang::DiagnosticIDs::Level::Warning);
+    IO.enumCase(Level, "Note", clang::DiagnosticIDs::Level::Note);
+  }
+};
+template <> struct SequenceElementTraits<ClangTidyOptions::CustomCheckDiag> {
+  static const bool flow = false;
+};
+template <> struct MappingTraits<ClangTidyOptions::CustomCheckDiag> {
+  static void mapping(IO &IO, ClangTidyOptions::CustomCheckDiag &D) {
+    IO.mapRequired("BindName", D.BindName);
+    MultiLineString MLS{D.Message};
+    IO.mapRequired("Message", MLS);
+    IO.mapOptional("Level", D.Level);
+  }
+};
+template <> struct SequenceElementTraits<ClangTidyOptions::CustomCheckValue> {
+  static const bool flow = false;
+};
+template <> struct MappingTraits<ClangTidyOptions::CustomCheckValue> {
+  static void mapping(IO &IO, ClangTidyOptions::CustomCheckValue &V) {
+    IO.mapRequired("Name", V.Name);
+    MultiLineString MLS{V.Query};
+    IO.mapRequired("Query", MLS);
+    IO.mapRequired("Diagnostic", V.Diags);
+  }
+};
+
 struct ChecksVariant {
   std::optional<std::string> AsString;
   std::optional<std::vector<std::string>> AsVector;
@@ -184,6 +231,7 @@ template <> struct MappingTraits<ClangTidyOptions> {
     IO.mapOptional("InheritParentConfig", Options.InheritParentConfig);
     IO.mapOptional("UseColor", Options.UseColor);
     IO.mapOptional("SystemHeaders", Options.SystemHeaders);
+    IO.mapOptional("CustomChecks", Options.CustomChecks);
   }
 };
 
@@ -245,7 +293,8 @@ ClangTidyOptions &ClangTidyOptions::mergeWith(const ClangTidyOptions &Other,
   overrideValue(UseColor, Other.UseColor);
   mergeVectors(ExtraArgs, Other.ExtraArgs);
   mergeVectors(ExtraArgsBefore, Other.ExtraArgsBefore);
-
+  // FIXME: how to handle duplicate names check?
+  mergeVectors(CustomChecks, Other.CustomChecks);
   for (const auto &KeyValue : Other.CheckOptions) {
     CheckOptions.insert_or_assign(
         KeyValue.getKey(),

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

@@ -9,6 +9,7 @@
 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CLANGTIDYOPTIONS_H
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CLANGTIDYOPTIONS_H
 
+#include "clang/Basic/DiagnosticIDs.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringMap.h"
@@ -129,6 +130,19 @@ struct ClangTidyOptions {
   /// Key-value mapping used to store check-specific options.
   OptionMap CheckOptions;
 
+  struct CustomCheckDiag {
+    std::string BindName;
+    std::string Message;
+    std::optional<DiagnosticIDs::Level> Level;
+  };
+  struct CustomCheckValue {
+    std::string Name;
+    std::string Query;
+    llvm::SmallVector<CustomCheckDiag> Diags;
+  };
+  using CustomCheckValueList = llvm::SmallVector<CustomCheckValue>;
+  std::optional<CustomCheckValueList> CustomChecks;
+
   using ArgList = std::vector<std::string>;
 
   /// Add extra compilation arguments to the end of the list.

clang-tools-extra/clang-tidy/clang-tidy-config.h.cmake

@@ -6,5 +6,6 @@
 #define CLANG_TIDY_CONFIG_H
 
 #cmakedefine01 CLANG_TIDY_ENABLE_STATIC_ANALYZER
+#cmakedefine01 CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS
 
 #endif

clang-tools-extra/clang-tidy/custom/CMakeLists.txt

@@ -0,0 +1,38 @@
+if(CLANG_TIDY_ENABLE_QUERY_BASED_CUSTOM_CHECKS)
+  set(LLVM_LINK_COMPONENTS
+    FrontendOpenMP
+    support
+  )
+
+  add_clang_library(clangTidyCustomModule STATIC
+    CustomTidyModule.cpp
+    QueryCheck.cpp
+
+    LINK_LIBS
+    clangTidy
+    clangTidyBugproneModule
+    clangTidyMiscModule
+    clangTidyModernizeModule
+    clangTidyPerformanceModule
+    clangTidyReadabilityModule
+    clangTidyUtils
+
+    DEPENDS
+    omp_gen
+    ClangDriverOptions
+  )
+
+  clang_target_link_libraries(clangTidyCustomModule
+    PRIVATE
+    clangAnalysis
+    clangAST
+    clangASTMatchers
+    clangBasic
+    clangDynamicASTMatchers
+    clangFrontend
+    clangLex
+    clangQuery
+    clangSerialization
+    clangTooling
+  )
+endif()