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/Sema/SemaCodeComplete.cpp

@@ -2453,8 +2453,10 @@ static void AddTypedNameChunk(ASTContext &Context, const PrintingPolicy &Policy,
 
 CodeCompletionString *CodeCompletionResult::CreateCodeCompletionString(Sema &S,
                                          CodeCompletionAllocator &Allocator,
-                                         CodeCompletionTUInfo &CCTUInfo) {
-  return CreateCodeCompletionString(S.Context, S.PP, Allocator, CCTUInfo);
+                                         CodeCompletionTUInfo &CCTUInfo,
+                                         bool IncludeBriefComments) {
+  return CreateCodeCompletionString(S.Context, S.PP, Allocator, CCTUInfo,
+                                    IncludeBriefComments);
 }
 
 /// \brief If possible, create a new code completion string for the given
@@ -2467,7 +2469,8 @@ CodeCompletionString *
 CodeCompletionResult::CreateCodeCompletionString(ASTContext &Ctx,
                                                  Preprocessor &PP,
                                            CodeCompletionAllocator &Allocator,
-                                           CodeCompletionTUInfo &CCTUInfo) {
+                                           CodeCompletionTUInfo &CCTUInfo,
+                                           bool IncludeBriefComments) {
   CodeCompletionBuilder Result(Allocator, CCTUInfo, Priority, Availability);
   
   PrintingPolicy Policy = getCompletionPrintingPolicy(Ctx, PP);
@@ -2537,7 +2540,14 @@ CodeCompletionResult::CreateCodeCompletionString(ASTContext &Ctx,
   assert(Kind == RK_Declaration && "Missed a result kind?");
   NamedDecl *ND = Declaration;
   Result.addParentContext(ND->getDeclContext());
-                          
+
+  if (IncludeBriefComments) {
+    // Add documentation comment, if it exists.
+    if (const RawComment *RC = Ctx.getRawCommentForDecl(ND)) {
+      Result.addBriefComment(RC->getBriefText(Ctx));
+    }
+  }
+
   if (StartsNestedNameSpecifier) {
     Result.AddTypedTextChunk(
                       Result.getAllocator().CopyString(ND->getNameAsString()));