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Proposal: Performance optimization for Windows #136

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merged 3 commits into from
Oct 23, 2021
Merged

Proposal: Performance optimization for Windows #136

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d279a4f
Apply clang-format
phprus Oct 3, 2021
7b8cf51
Replace std::shared_ptr to std::unique_ptr
phprus Oct 3, 2021
1dbe2d9
Replace std::shared_ptr<void> to unique_handle
phprus Oct 3, 2021
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161 changes: 117 additions & 44 deletions include/ghc/filesystem.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -424,10 +424,11 @@ class GHC_FS_API_CLASS path
template <typename T>
using path_type_EcharT = typename std::enable_if<std::is_same<T, char>::value || std::is_same<T, char8_t>::value || std::is_same<T, char16_t>::value || std::is_same<T, char32_t>::value || std::is_same<T, wchar_t>::value, path>::type;
#else
using path_from_string = typename std::enable_if<_is_basic_string<T>::value || std::is_same<char const*, typename std::decay<T>::type>::value || std::is_same<char*, typename std::decay<T>::type>::value ||
using path_from_string =
typename std::enable_if<_is_basic_string<T>::value || std::is_same<char const*, typename std::decay<T>::type>::value || std::is_same<char*, typename std::decay<T>::type>::value ||
std::is_same<char16_t const*, typename std::decay<T>::type>::value || std::is_same<char16_t*, typename std::decay<T>::type>::value || std::is_same<char32_t const*, typename std::decay<T>::type>::value ||
std::is_same<char32_t*, typename std::decay<T>::type>::value || std::is_same<wchar_t const*, typename std::decay<T>::type>::value || std::is_same<wchar_t*, typename std::decay<T>::type>::value,
path>::type;
path>::type;
template <typename T>
using path_type_EcharT = typename std::enable_if<std::is_same<T, char>::value || std::is_same<T, char16_t>::value || std::is_same<T, char32_t>::value || std::is_same<T, wchar_t>::value, path>::type;
#endif
Expand Down Expand Up @@ -605,7 +606,7 @@ class GHC_FS_API_CLASS path
friend bool detail::has_executable_extension(const path& p);
#ifdef GHC_WIN_AUTO_PREFIX_LONG_PATH
string_type::size_type _prefixLength{0};
#else // GHC_WIN_AUTO_PREFIX_LONG_PATH
#else // GHC_WIN_AUTO_PREFIX_LONG_PATH
static const string_type::size_type _prefixLength{0};
#endif // GHC_WIN_AUTO_PREFIX_LONG_PATH
#else
Expand Down Expand Up @@ -800,6 +801,7 @@ class GHC_FS_API_CLASS file_status
file_type type() const noexcept;
perms permissions() const noexcept;
friend bool operator==(const file_status& lhs, const file_status& rhs) noexcept { return lhs.type() == rhs.type() && lhs.permissions() == rhs.permissions(); }

private:
file_type _type;
perms _perms;
Expand Down Expand Up @@ -1697,7 +1699,7 @@ inline std::wstring toWChar(const charT* unicodeString)
return toWChar(std::basic_string<charT, std::char_traits<charT>>(unicodeString));
#endif
}
#endif // GHC_USE_WCHAR_T
#endif // GHC_USE_WCHAR_T

} // namespace detail

Expand Down Expand Up @@ -1816,16 +1818,16 @@ GHC_INLINE bool equals_simple_insensitive(const path::value_type* str1, const pa
return true;
}
return false;
#else // __GNUC__
#else // __GNUC__
#ifdef GHC_USE_WCHAR_T
return 0 == ::_wcsicmp(str1, str2);
#else // GHC_USE_WCHAR_T
#else // GHC_USE_WCHAR_T
return 0 == ::_stricmp(str1, str2);
#endif // GHC_USE_WCHAR_T
#endif // __GNUC__
#else // GHC_OS_WINDOWS
#endif // GHC_USE_WCHAR_T
#endif // __GNUC__
#else // GHC_OS_WINDOWS
return 0 == ::strcasecmp(str1, str2);
#endif // GHC_OS_WINDOWS
#endif // GHC_OS_WINDOWS
}

GHC_INLINE int compare_simple_insensitive(const path::value_type* str1, size_t len1, const path::value_type* str2, size_t len2)
Expand Down Expand Up @@ -2005,6 +2007,52 @@ GHC_INLINE file_status file_status_from_st_mode(T mode)
}

#ifdef GHC_OS_WINDOWS

class unique_handle
{
public:
typedef HANDLE element_type;

unique_handle() noexcept
: handle_(INVALID_HANDLE_VALUE)
{
}
explicit unique_handle(element_type h) noexcept
: handle_(h)
{
}
unique_handle(unique_handle&& u) noexcept
: handle_(u.release())
{
}
~unique_handle() { reset(); }
unique_handle& operator=(unique_handle&& u) noexcept
{
reset(u.release());
return *this;
}
element_type get() const noexcept { return handle_; }
explicit operator bool() const noexcept { return handle_ != INVALID_HANDLE_VALUE; }
element_type release() noexcept
{
element_type tmp = handle_;
handle_ = INVALID_HANDLE_VALUE;
return tmp;
}
void reset(element_type h = INVALID_HANDLE_VALUE) noexcept
{
element_type tmp = handle_;
handle_ = h;
if (tmp != INVALID_HANDLE_VALUE) {
CloseHandle(tmp);
}
}
void swap(unique_handle& u) noexcept { std::swap(handle_, u.handle_); }

private:
element_type handle_;
};

#ifndef REPARSE_DATA_BUFFER_HEADER_SIZE
typedef struct _REPARSE_DATA_BUFFER
{
Expand Down Expand Up @@ -2041,15 +2089,21 @@ typedef struct _REPARSE_DATA_BUFFER
#endif
#endif

GHC_INLINE std::shared_ptr<REPARSE_DATA_BUFFER> getReparseData(const path& p, std::error_code& ec)
template <class T>
struct free_deleter
{
std::shared_ptr<void> file(CreateFileW(GHC_NATIVEWP(p), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, 0), CloseHandle);
if (file.get() == INVALID_HANDLE_VALUE) {
void operator()(T* p) const { std::free(p); }
};

GHC_INLINE std::unique_ptr<REPARSE_DATA_BUFFER, free_deleter<REPARSE_DATA_BUFFER>> getReparseData(const path& p, std::error_code& ec)
{
unique_handle file(CreateFileW(GHC_NATIVEWP(p), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_BACKUP_SEMANTICS, 0));
if (!file) {
ec = detail::make_system_error();
return nullptr;
}

std::shared_ptr<REPARSE_DATA_BUFFER> reparseData((REPARSE_DATA_BUFFER*)std::calloc(1, MAXIMUM_REPARSE_DATA_BUFFER_SIZE), std::free);
std::unique_ptr<REPARSE_DATA_BUFFER, free_deleter<REPARSE_DATA_BUFFER>> reparseData(reinterpret_cast<REPARSE_DATA_BUFFER*>(std::calloc(1, MAXIMUM_REPARSE_DATA_BUFFER_SIZE)));
ULONG bufferUsed;
if (DeviceIoControl(file.get(), FSCTL_GET_REPARSE_POINT, 0, 0, reparseData.get(), MAXIMUM_REPARSE_DATA_BUFFER_SIZE, &bufferUsed, 0)) {
return reparseData;
Expand Down Expand Up @@ -2086,7 +2140,7 @@ GHC_INLINE path resolveSymlink(const path& p, std::error_code& ec)
}
case IO_REPARSE_TAG_MOUNT_POINT:
result = detail::getFullPathName(GHC_NATIVEWP(p), ec);
//result = std::wstring(&reparseData->MountPointReparseBuffer.PathBuffer[reparseData->MountPointReparseBuffer.SubstituteNameOffset / sizeof(WCHAR)], reparseData->MountPointReparseBuffer.SubstituteNameLength / sizeof(WCHAR));
// result = std::wstring(&reparseData->MountPointReparseBuffer.PathBuffer[reparseData->MountPointReparseBuffer.SubstituteNameOffset / sizeof(WCHAR)], reparseData->MountPointReparseBuffer.SubstituteNameLength / sizeof(WCHAR));
break;
default:
break;
Expand Down Expand Up @@ -3057,7 +3111,8 @@ GHC_INLINE bool has_executable_extension(const path& p)
return false;
}
const path::value_type* ext = fn._path.c_str() + pos + 1;
if (detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("exe")) || detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("cmd")) || detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("bat")) || detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("com"))) {
if (detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("exe")) || detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("cmd")) || detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("bat")) ||
detail::equals_simple_insensitive(ext, GHC_PLATFORM_LITERAL("com"))) {
return true;
}
}
Expand Down Expand Up @@ -3216,7 +3271,7 @@ GHC_INLINE path::iterator::iterator(const path& p, const impl_string_type::const
, _root(p.has_root_directory() ? _first + static_cast<string_type::difference_type>(p._prefixLength + p.root_name_length()) : _last)
, _iter(pos)
{
if(pos != _last) {
if (pos != _last) {
updateCurrent();
}
}
Expand Down Expand Up @@ -3296,10 +3351,10 @@ GHC_INLINE void path::iterator::updateCurrent()
GHC_INLINE path::iterator& path::iterator::operator++()
{
_iter = increment(_iter);
while (_iter != _last && // we didn't reach the end
_iter != _root && // this is not a root position
while (_iter != _last && // we didn't reach the end
_iter != _root && // this is not a root position
*_iter == preferred_separator && // we are on a separator
(_iter + 1) != _last // the slash is not the last char
(_iter + 1) != _last // the slash is not the last char
) {
++_iter;
}
Expand Down Expand Up @@ -4153,10 +4208,10 @@ GHC_INLINE bool equivalent(const path& p1, const path& p2, std::error_code& ec)
{
ec.clear();
#ifdef GHC_OS_WINDOWS
std::shared_ptr<void> file1(::CreateFileW(GHC_NATIVEWP(p1), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0), CloseHandle);
detail::unique_handle file1(::CreateFileW(GHC_NATIVEWP(p1), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
auto e1 = ::GetLastError();
std::shared_ptr<void> file2(::CreateFileW(GHC_NATIVEWP(p2), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0), CloseHandle);
if (file1.get() == INVALID_HANDLE_VALUE || file2.get() == INVALID_HANDLE_VALUE) {
detail::unique_handle file2(::CreateFileW(GHC_NATIVEWP(p2), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
if (!file1 || !file2) {
#ifdef LWG_2937_BEHAVIOUR
ec = detail::make_system_error(e1 ? e1 : ::GetLastError());
#else
Expand Down Expand Up @@ -4246,9 +4301,9 @@ GHC_INLINE uintmax_t hard_link_count(const path& p, std::error_code& ec) noexcep
ec.clear();
#ifdef GHC_OS_WINDOWS
uintmax_t result = static_cast<uintmax_t>(-1);
std::shared_ptr<void> file(::CreateFileW(GHC_NATIVEWP(p), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0), CloseHandle);
detail::unique_handle file(::CreateFileW(GHC_NATIVEWP(p), 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
BY_HANDLE_FILE_INFORMATION inf;
if (file.get() == INVALID_HANDLE_VALUE) {
if (!file) {
ec = detail::make_system_error();
}
else {
Expand Down Expand Up @@ -4477,7 +4532,7 @@ GHC_INLINE void last_write_time(const path& p, file_time_type new_time, std::err
ec.clear();
auto d = new_time.time_since_epoch();
#ifdef GHC_OS_WINDOWS
std::shared_ptr<void> file(::CreateFileW(GHC_NATIVEWP(p), FILE_WRITE_ATTRIBUTES, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL), ::CloseHandle);
detail::unique_handle file(::CreateFileW(GHC_NATIVEWP(p), FILE_WRITE_ATTRIBUTES, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL));
FILETIME ft;
auto tt = std::chrono::duration_cast<std::chrono::microseconds>(d).count() * 10 + 116444736000000000;
ft.dwLowDateTime = static_cast<DWORD>(tt);
Expand Down Expand Up @@ -4688,9 +4743,9 @@ GHC_INLINE bool remove(const path& p, std::error_code& ec) noexcept
}
ec = detail::make_system_error(error);
}
else if(attr & FILE_ATTRIBUTE_READONLY) {
else if (attr & FILE_ATTRIBUTE_READONLY) {
auto new_attr = attr & ~static_cast<DWORD>(FILE_ATTRIBUTE_READONLY);
if(!SetFileAttributesW(cstr, new_attr)) {
if (!SetFileAttributesW(cstr, new_attr)) {
auto error = ::GetLastError();
ec = detail::make_system_error(error);
}
Expand Down Expand Up @@ -4831,8 +4886,8 @@ GHC_INLINE void resize_file(const path& p, uintmax_t size, std::error_code& ec)
#endif
return;
}
std::shared_ptr<void> file(CreateFileW(GHC_NATIVEWP(p), GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL), CloseHandle);
if (file.get() == INVALID_HANDLE_VALUE) {
detail::unique_handle file(CreateFileW(GHC_NATIVEWP(p), GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL));
if (!file) {
ec = detail::make_system_error();
}
else if (SetFilePointerEx(file.get(), lisize, NULL, FILE_BEGIN) == 0 || SetEndOfFile(file.get()) == 0) {
Expand Down Expand Up @@ -5175,7 +5230,7 @@ GHC_INLINE file_type directory_entry::status_file_type() const

GHC_INLINE file_type directory_entry::status_file_type(std::error_code& ec) const noexcept
{
if(_status.type() != file_type::none) {
if (_status.type() != file_type::none) {
ec.clear();
return _status.type();
}
Expand Down Expand Up @@ -5289,7 +5344,7 @@ GHC_INLINE bool directory_entry::is_symlink() const

GHC_INLINE bool directory_entry::is_symlink(std::error_code& ec) const noexcept
{
if(_symlink_status.type() != file_type::none) {
if (_symlink_status.type() != file_type::none) {
ec.clear();
return _symlink_status.type() == file_type::symlink;
}
Expand Down Expand Up @@ -5608,16 +5663,34 @@ class directory_iterator::impl
_dir_entry._status = file_status();
#else
_dir_entry._symlink_status.permissions(perms::unknown);
switch(_entry->d_type) {
case DT_BLK: _dir_entry._symlink_status.type(file_type::block); break;
case DT_CHR: _dir_entry._symlink_status.type(file_type::character); break;
case DT_DIR: _dir_entry._symlink_status.type(file_type::directory); break;
case DT_FIFO: _dir_entry._symlink_status.type(file_type::fifo); break;
case DT_LNK: _dir_entry._symlink_status.type(file_type::symlink); break;
case DT_REG: _dir_entry._symlink_status.type(file_type::regular); break;
case DT_SOCK: _dir_entry._symlink_status.type(file_type::socket); break;
case DT_UNKNOWN: _dir_entry._symlink_status.type(file_type::none); break;
default: _dir_entry._symlink_status.type(file_type::unknown); break;
switch (_entry->d_type) {
case DT_BLK:
_dir_entry._symlink_status.type(file_type::block);
break;
case DT_CHR:
_dir_entry._symlink_status.type(file_type::character);
break;
case DT_DIR:
_dir_entry._symlink_status.type(file_type::directory);
break;
case DT_FIFO:
_dir_entry._symlink_status.type(file_type::fifo);
break;
case DT_LNK:
_dir_entry._symlink_status.type(file_type::symlink);
break;
case DT_REG:
_dir_entry._symlink_status.type(file_type::regular);
break;
case DT_SOCK:
_dir_entry._symlink_status.type(file_type::socket);
break;
case DT_UNKNOWN:
_dir_entry._symlink_status.type(file_type::none);
break;
default:
_dir_entry._symlink_status.type(file_type::unknown);
break;
}
if (_entry->d_type != DT_LNK) {
_dir_entry._status = _dir_entry._symlink_status;
Expand Down Expand Up @@ -5857,10 +5930,10 @@ GHC_INLINE recursive_directory_iterator& recursive_directory_iterator::increment
{
bool isSymLink = (*this)->is_symlink(ec);
bool isDir = !ec && (*this)->is_directory(ec);
if(isSymLink && detail::is_not_found_error(ec)) {
if (isSymLink && detail::is_not_found_error(ec)) {
ec.clear();
}
if(!ec) {
if (!ec) {
if (recursion_pending() && isDir && (!isSymLink || (options() & directory_options::follow_directory_symlink) != directory_options::none)) {
_impl->_dir_iter_stack.push(directory_iterator((*this)->path(), _impl->_options, ec));
}
Expand Down