377     StringRef &Filename, HeaderSearch &HS, SourceLocation IncludeLoc,  in LookupFile()  argument
401     return HS.getFileAndSuggestModule(TmpDir, IncludeLoc, getDir(),  in LookupFile()
407     return DoFrameworkLookup(Filename, HS, SearchPath, RelativePath,  in LookupFile()
438     Optional<FileEntryRef> Result = HM->LookupFile(Filename, HS.getFileMgr());  in LookupFile()
443   } else if (auto Res = HS.getFileMgr().getOptionalFileRef(Dest)) {  in LookupFile()
514     StringRef Filename, HeaderSearch &HS, SmallVectorImpl<char> *SearchPath,  in DoFrameworkLookup()  argument
518   FileManager &FileMgr = HS.getFileMgr();  in DoFrameworkLookup()
528     HS.LookupFrameworkCache(Filename.substr(0, SlashPos));  in DoFrameworkLookup()
636       if (!HS.findUsableModuleForFrameworkHeader(  in DoFrameworkLookup()
641       if (!HS.findUsableModuleForHeader(&File->getFileEntry(), getDir(),  in DoFrameworkLookup()
1432 static bool suggestModule(HeaderSearch &HS, const FileEntry *File,  in suggestModule()  argument
1436       HS.findModuleForHeader(File, /*AllowTextual*/true);  in suggestModule()
1441     HS.getModuleMap().resolveUses(RequestingModule, /*Complain*/ false);  in suggestModule()
1448       if (HS.getModuleMap().isBuiltinHeader(File)) {  in suggestModule()