Implement support for Clang Rulesets

clang/include/clang/ASTMatchers/ASTMatchFinder.h

@@ -200,6 +200,8 @@ class MatchFinder {
   /// Finds all matches in the given AST.
   void matchAST(ASTContext &Context);
 
+  void matchDecl(clang::Decl *Decl, ASTContext &Context);
+
   /// Registers a callback to notify the end of parsing.
   ///
   /// The provided closure is called after parsing is done, before the AST is

clang/include/clang/Basic/DiagnosticCommonKinds.td

@@ -397,6 +397,17 @@ def note_mt_message : Note<"[rewriter] %0">;
 def warn_arcmt_nsalloc_realloc : Warning<"[rewriter] call returns pointer to GC managed memory; it will become unmanaged in ARC">;
 def err_arcmt_nsinvocation_ownership : Error<"NSInvocation's %0 is not safe to be used with an object with ownership other than __unsafe_unretained">;
 
+// Clang rules
+def err_clangrules_message : Error<"%0">;
+def warn_clangrules_message : Warning<"%0">, InGroup<DiagGroup<"clangrules">>;
+def note_clangrules_message : Note<"%0">;
+def err_clangrules_rule_name_is_prefixed : Error<"Rule name '%0' must be unprefixed and not contain a '/' character.">;
+def err_clangrules_ruleset_name_is_prefixed : Error<"Ruleset name '%0' must be unprefixed and not contain a '/' character.">;
+def err_clangrules_ruleset_severity_is_notset : Error<"Ruleset '%0' severity must be a value other than 'NotSet'.">;
+def err_clangrules_rule_name_conflict : Error<"Namespaced rule name '%0' is already declared in another .clang-rules file. Try using a different namespace to avoid conflicts.">;
+def err_clangrules_rule_missing : Error<"Namespaced ruleset '%0' requested namespaced rule '%1' but it wasn't known at runtime. Make sure it is declared in either the same .clang-rules file, or in a .clang-rules file in a parent directory.">;
+def err_clangrules_rule_matcher_parse_failure : Error<"Namespaced rule '%0' matcher failed to parse: %1">;
+
 // API notes
 def err_apinotes_message : Error<"%0">;
 def warn_apinotes_message : Warning<"%0">, InGroup<DiagGroup<"apinotes">>;

clang/lib/ASTMatchers/ASTMatchFinder.cpp

@@ -1700,6 +1700,12 @@ void MatchFinder::matchAST(ASTContext &Context) {
   Visitor.onEndOfTranslationUnit();
 }
 
+void MatchFinder::matchDecl(clang::Decl *Decl, ASTContext &Context) {
+  internal::MatchASTVisitor Visitor(&Matchers, Options);
+  Visitor.set_active_ast_context(&Context);
+  Visitor.getDerived().TraverseDecl(Decl);
+}
+
 void MatchFinder::registerTestCallbackAfterParsing(
     MatchFinder::ParsingDoneTestCallback *NewParsingDone) {
   ParsingDone = NewParsingDone;

clang/lib/Frontend/CMakeLists.txt

@@ -15,6 +15,7 @@ add_clang_library(clangFrontend
   ASTUnit.cpp
   ChainedDiagnosticConsumer.cpp
   ChainedIncludesSource.cpp
+  ClangRulesets.cpp
   CompilerInstance.cpp
   CompilerInvocation.cpp
   CreateInvocationFromCommandLine.cpp
@@ -57,4 +58,6 @@ add_clang_library(clangFrontend
   clangParse
   clangSema
   clangSerialization
+  clangASTMatchers
+  clangDynamicASTMatchers
   )