Add a new libclang completion API to get brief documentation comment that is

attached to a declaration in the completion string.

Since extracting comments isn't free, a new code completion option is
introduced.

A new code completion option that enables including brief comments
into CodeCompletionString should be a, err, code completion option.
But because ASTUnit caches global declarations during parsing before
even completion consumer is created, the option is duplicated as a
translation unit option (in both libclang and ASTUnit, like the option
to cache code completion results).

llvm-svn: 159539

clang/lib/Frontend/CompilerInstance.cpp

@@ -387,9 +387,7 @@ void CompilerInstance::createCodeCompletionConsumer() {
     setCodeCompletionConsumer(
       createCodeCompletionConsumer(getPreprocessor(),
                                    Loc.FileName, Loc.Line, Loc.Column,
-                                   getFrontendOpts().ShowMacrosInCodeCompletion,
-                             getFrontendOpts().ShowCodePatternsInCodeCompletion,
-                           getFrontendOpts().ShowGlobalSymbolsInCodeCompletion,
+                                   getFrontendOpts().CodeCompleteOpts,
                                    llvm::outs()));
     if (!CompletionConsumer)
       return;
@@ -415,16 +413,13 @@ CompilerInstance::createCodeCompletionConsumer(Preprocessor &PP,
                                                const std::string &Filename,
                                                unsigned Line,
                                                unsigned Column,
-                                               bool ShowMacros,
-                                               bool ShowCodePatterns,
-                                               bool ShowGlobals,
+                                               const CodeCompleteOptions &Opts,
                                                raw_ostream &OS) {
   if (EnableCodeCompletion(PP, Filename, Line, Column))
     return 0;
 
   // Set up the creation routine for code-completion.
-  return new PrintingCodeCompleteConsumer(ShowMacros, ShowCodePatterns,
-                                          ShowGlobals, OS);
+  return new PrintingCodeCompleteConsumer(Opts, OS);
 }
 
 void CompilerInstance::createSema(TranslationUnitKind TUKind,