451     StringRef &Filename, HeaderSearch &HS, SourceLocation IncludeLoc,  in LookupFile()  argument
476     return HS.getFileAndSuggestModule(  in LookupFile()
482     return DoFrameworkLookup(Filename, HS, SearchPath, RelativePath,  in LookupFile()
516   if (auto Res = HS.getFileMgr().getOptionalFileRef(Dest, OpenFile)) {  in LookupFile()
525   HS.noteLookupUsage(HS.searchDirIdx(*this), IncludeLoc);  in LookupFile()
590     StringRef Filename, HeaderSearch &HS, SmallVectorImpl<char> *SearchPath,  in DoFrameworkLookup()  argument
594   FileManager &FileMgr = HS.getFileMgr();  in DoFrameworkLookup()
604     HS.LookupFrameworkCache(Filename.substr(0, SlashPos));  in DoFrameworkLookup()
712       if (!HS.findUsableModuleForFrameworkHeader(  in DoFrameworkLookup()
717       if (!HS.findUsableModuleForHeader(&File->getFileEntry(), getDir(),  in DoFrameworkLookup()
1578 static bool suggestModule(HeaderSearch &HS, const FileEntry *File,  in suggestModule()  argument
1582       HS.findModuleForHeader(File, /*AllowTextual*/true);  in suggestModule()
1587     HS.getModuleMap().resolveUses(RequestingModule, /*Complain*/ false);  in suggestModule()
1594       if (HS.getModuleMap().isBuiltinHeader(File)) {  in suggestModule()