237   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
315   llvm::sys::fs::directory_iterator Iter;
319     if (Iter != llvm::sys::fs::directory_iterator())  in RealFSDirIter()
326     CurrentEntry = (Iter == llvm::sys::fs::directory_iterator())  in increment()
335 directory_iterator RealFileSystem::dir_begin(const Twine &Dir,  in dir_begin()
337   return directory_iterator(std::make_shared<RealFSDirIter>(Dir, EC));  in dir_begin()
414   directory_iterator CurrentDirIter;
425       if (CurrentDirIter != directory_iterator())  in incrementFS()
432     assert((IsFirstTime || CurrentDirIter != directory_iterator()) &&  in incrementDirIter()
437     if (!EC && CurrentDirIter == directory_iterator())  in incrementDirIter()
445       if (EC || CurrentDirIter == directory_iterator()) {  in incrementImpl()
470 directory_iterator OverlayFileSystem::dir_begin(const Twine &Dir,  in dir_begin()
472   return directory_iterator(  in dir_begin()
889 directory_iterator InMemoryFileSystem::dir_begin(const Twine &Dir,  in dir_begin()
894     return directory_iterator(std::make_shared<InMemoryDirIterator>());  in dir_begin()
898     return directory_iterator(  in dir_begin()
902   return directory_iterator(std::make_shared<InMemoryDirIterator>());  in dir_begin()
965   directory_iterator ExternalDirIter;
1006 directory_iterator RedirectingFileSystem::dir_begin(const Twine &Dir,  in dir_begin()
1027   return directory_iterator(std::make_shared<VFSFromYamlDirIterImpl>(  in dir_begin()
1980   assert(!(IsExternalFSCurrent && ExternalDirIter == directory_iterator()) &&  in incrementExternal()
1992   if (EC || ExternalDirIter == directory_iterator()) {  in incrementExternal()
2038   directory_iterator I = FS->dir_begin(Path, EC);  in recursive_directory_iterator()
2039   if (I != directory_iterator()) {  in recursive_directory_iterator()
2049   vfs::directory_iterator End;  in increment()
2055       vfs::directory_iterator I = FS->dir_begin(State->Stack.top()->path(), EC);  in increment()