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llvm-project/llvm/lib/Support/Windows/PathV2.inc

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//===- llvm/Support/Windows/PathV2.inc - Windows Path Impl ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Windows specific implementation of the PathV2 API.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Windows code that
//=== is guaranteed to work on *all* Windows variants.
//===----------------------------------------------------------------------===//
#include "Windows.h"
#include <wincrypt.h>
#include <fcntl.h>
#include <io.h>
#include <sys/stat.h>
#include <sys/types.h>
// MinGW doesn't define this.
#ifndef _ERRNO_T_DEFINED
#define _ERRNO_T_DEFINED
typedef int errno_t;
#endif
using namespace llvm;
namespace {
typedef BOOLEAN (WINAPI *PtrCreateSymbolicLinkW)(
/*__in*/ LPCWSTR lpSymlinkFileName,
/*__in*/ LPCWSTR lpTargetFileName,
/*__in*/ DWORD dwFlags);
PtrCreateSymbolicLinkW create_symbolic_link_api = PtrCreateSymbolicLinkW(
::GetProcAddress(::GetModuleHandleA("kernel32.dll"),
"CreateSymbolicLinkW"));
error_code UTF8ToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16) {
int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
utf8.begin(), utf8.size(),
utf16.begin(), 0);
if (len == 0)
return windows_error(::GetLastError());
utf16.reserve(len + 1);
utf16.set_size(len);
len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
utf8.begin(), utf8.size(),
utf16.begin(), utf16.size());
if (len == 0)
return windows_error(::GetLastError());
// Make utf16 null terminated.
utf16.push_back(0);
utf16.pop_back();
return success;
}
error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
SmallVectorImpl<char> &utf8) {
// Get length.
int len = ::WideCharToMultiByte(CP_UTF8, 0,
utf16, utf16_len,
utf8.begin(), 0,
NULL, NULL);
if (len == 0)
return windows_error(::GetLastError());
utf8.reserve(len);
utf8.set_size(len);
// Now do the actual conversion.
len = ::WideCharToMultiByte(CP_UTF8, 0,
utf16, utf16_len,
utf8.data(), utf8.size(),
NULL, NULL);
if (len == 0)
return windows_error(::GetLastError());
// Make utf8 null terminated.
utf8.push_back(0);
utf8.pop_back();
return success;
}
error_code TempDir(SmallVectorImpl<wchar_t> &result) {
retry_temp_dir:
DWORD len = ::GetTempPathW(result.capacity(), result.begin());
if (len == 0)
return windows_error(::GetLastError());
if (len > result.capacity()) {
result.reserve(len);
goto retry_temp_dir;
}
result.set_size(len);
return success;
}
// Forwarder for ScopedHandle.
BOOL WINAPI CryptReleaseContext(HCRYPTPROV Provider) {
return ::CryptReleaseContext(Provider, 0);
}
typedef ScopedHandle<HCRYPTPROV, uintptr_t(-1),
BOOL (WINAPI*)(HCRYPTPROV), CryptReleaseContext>
ScopedCryptContext;
bool is_separator(const wchar_t value) {
switch (value) {
case L'\\':
case L'/':
return true;
default:
return false;
}
}
}
namespace llvm {
namespace sys {
namespace fs {
error_code current_path(SmallVectorImpl<char> &result) {
SmallVector<wchar_t, 128> cur_path;
cur_path.reserve(128);
retry_cur_dir:
DWORD len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
// A zero return value indicates a failure other than insufficient space.
if (len == 0)
return windows_error(::GetLastError());
// If there's insufficient space, the len returned is larger than the len
// given.
if (len > cur_path.capacity()) {
cur_path.reserve(len);
goto retry_cur_dir;
}
cur_path.set_size(len);
// cur_path now holds the current directory in utf-16. Convert to utf-8.
// Find out how much space we need. Sadly, this function doesn't return the
// size needed unless you tell it the result size is 0, which means you
// _always_ have to call it twice.
len = ::WideCharToMultiByte(CP_UTF8, 0,
cur_path.data(), cur_path.size(),
result.data(), 0,
NULL, NULL);
if (len == 0)
return make_error_code(windows_error(::GetLastError()));
result.reserve(len);
result.set_size(len);
// Now do the actual conversion.
len = ::WideCharToMultiByte(CP_UTF8, 0,
cur_path.data(), cur_path.size(),
result.data(), result.size(),
NULL, NULL);
if (len == 0)
return windows_error(::GetLastError());
return success;
}
error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toStringRef(from_storage);
StringRef t = to.toStringRef(to_storage);
// Convert to utf-16.
SmallVector<wchar_t, 128> wide_from;
SmallVector<wchar_t, 128> wide_to;
if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
// Copy the file.
BOOL res = ::CopyFileW(wide_from.begin(), wide_to.begin(),
copt != copy_option::overwrite_if_exists);
if (res == 0)
return windows_error(::GetLastError());
return success;
}
error_code create_directory(const Twine &path, bool &existed) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
path_utf16))
return ec;
if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
error_code ec = windows_error(::GetLastError());
if (ec == windows_error::already_exists)
existed = true;
else
return ec;
} else
existed = false;
return success;
}
error_code create_hard_link(const Twine &to, const Twine &from) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toStringRef(from_storage);
StringRef t = to.toStringRef(to_storage);
// Convert to utf-16.
SmallVector<wchar_t, 128> wide_from;
SmallVector<wchar_t, 128> wide_to;
if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
return windows_error(::GetLastError());
return success;
}
error_code create_symlink(const Twine &to, const Twine &from) {
// Only do it if the function is available at runtime.
if (!create_symbolic_link_api)
return make_error_code(errc::function_not_supported);
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toStringRef(from_storage);
StringRef t = to.toStringRef(to_storage);
// Convert to utf-16.
SmallVector<wchar_t, 128> wide_from;
SmallVector<wchar_t, 128> wide_to;
if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
if (!create_symbolic_link_api(wide_from.begin(), wide_to.begin(), 0))
return windows_error(::GetLastError());
return success;
}
error_code remove(const Twine &path, bool &existed) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
file_status st;
if (error_code ec = status(path, st))
return ec;
if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
path_utf16))
return ec;
if (st.type() == file_type::directory_file) {
if (!::RemoveDirectoryW(c_str(path_utf16))) {
error_code ec = windows_error(::GetLastError());
if (ec != windows_error::file_not_found)
return ec;
existed = false;
} else
existed = true;
} else {
if (!::DeleteFileW(c_str(path_utf16))) {
error_code ec = windows_error(::GetLastError());
if (ec != windows_error::file_not_found)
return ec;
existed = false;
} else
existed = true;
}
return success;
}
error_code rename(const Twine &from, const Twine &to) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toStringRef(from_storage);
StringRef t = to.toStringRef(to_storage);
// Convert to utf-16.
SmallVector<wchar_t, 128> wide_from;
SmallVector<wchar_t, 128> wide_to;
if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
if (!::MoveFileExW(wide_from.begin(), wide_to.begin(),
MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
return windows_error(::GetLastError());
return success;
}
error_code resize_file(const Twine &path, uint64_t size) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
path_utf16))
return ec;
int fd = ::_wopen(path_utf16.begin(), O_BINARY, S_IREAD | S_IWRITE);
if (fd == -1)
return error_code(errno, generic_category());
#ifdef HAVE__CHSIZE_S
errno_t error = ::_chsize_s(fd, size);
#else
errno_t error = ::_chsize(fd, size);
#endif
::close(fd);
return error_code(error, generic_category());
}
error_code exists(const Twine &path, bool &result) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
path_utf16))
return ec;
DWORD attributes = ::GetFileAttributesW(path_utf16.begin());
if (attributes == INVALID_FILE_ATTRIBUTES) {
// See if the file didn't actually exist.
error_code ec = make_error_code(windows_error(::GetLastError()));
if (ec != windows_error::file_not_found &&
ec != windows_error::path_not_found)
return ec;
result = false;
} else
result = true;
return success;
}
error_code equivalent(const Twine &A, const Twine &B, bool &result) {
// Get arguments.
SmallString<128> a_storage;
SmallString<128> b_storage;
StringRef a = A.toStringRef(a_storage);
StringRef b = B.toStringRef(b_storage);
// Convert to utf-16.
SmallVector<wchar_t, 128> wide_a;
SmallVector<wchar_t, 128> wide_b;
if (error_code ec = UTF8ToUTF16(a, wide_a)) return ec;
if (error_code ec = UTF8ToUTF16(b, wide_b)) return ec;
AutoHandle HandleB(
::CreateFileW(wide_b.begin(),
0,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
0,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
0));
AutoHandle HandleA(
::CreateFileW(wide_a.begin(),
0,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
0,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
0));
// If both handles are invalid, it's an error.
if (HandleA == INVALID_HANDLE_VALUE &&
HandleB == INVALID_HANDLE_VALUE)
return windows_error(::GetLastError());
// If only one is invalid, it's false.
if (HandleA == INVALID_HANDLE_VALUE &&
HandleB == INVALID_HANDLE_VALUE) {
result = false;
return success;
}
// Get file information.
BY_HANDLE_FILE_INFORMATION InfoA, InfoB;
if (!::GetFileInformationByHandle(HandleA, &InfoA))
return windows_error(::GetLastError());
if (!::GetFileInformationByHandle(HandleB, &InfoB))
return windows_error(::GetLastError());
// See if it's all the same.
result =
InfoA.dwVolumeSerialNumber == InfoB.dwVolumeSerialNumber &&
InfoA.nFileIndexHigh == InfoB.nFileIndexHigh &&
InfoA.nFileIndexLow == InfoB.nFileIndexLow &&
InfoA.nFileSizeHigh == InfoB.nFileSizeHigh &&
InfoA.nFileSizeLow == InfoB.nFileSizeLow &&
InfoA.ftLastWriteTime.dwLowDateTime ==
InfoB.ftLastWriteTime.dwLowDateTime &&
InfoA.ftLastWriteTime.dwHighDateTime ==
InfoB.ftLastWriteTime.dwHighDateTime;
return success;
}
error_code file_size(const Twine &path, uint64_t &result) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
path_utf16))
return ec;
WIN32_FILE_ATTRIBUTE_DATA FileData;
if (!::GetFileAttributesExW(path_utf16.begin(),
::GetFileExInfoStandard,
&FileData))
return windows_error(::GetLastError());
result =
(uint64_t(FileData.nFileSizeHigh) << (sizeof(FileData.nFileSizeLow) * 8))
+ FileData.nFileSizeLow;
return success;
}
error_code status(const Twine &path, file_status &result) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
StringRef path8 = path.toStringRef(path_storage);
// FIXME: We should detect as many "special file name" as possible.
if (path8.compare_lower("nul") == 0) {
result = file_status(file_type::character_file);
return success;
}
if (error_code ec = UTF8ToUTF16(path8,
path_utf16))
return ec;
DWORD attr = ::GetFileAttributesW(path_utf16.begin());
if (attr == INVALID_FILE_ATTRIBUTES)
goto handle_status_error;
// Handle reparse points.
if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
AutoHandle h(
::CreateFileW(path_utf16.begin(),
0, // Attributes only.
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
0));
if (h == INVALID_HANDLE_VALUE)
goto handle_status_error;
}
if (attr & FILE_ATTRIBUTE_DIRECTORY)
result = file_status(file_type::directory_file);
else
result = file_status(file_type::regular_file);
return success;
handle_status_error:
error_code ec = windows_error(::GetLastError());
if (ec == windows_error::file_not_found ||
ec == windows_error::path_not_found)
result = file_status(file_type::file_not_found);
else if (ec == windows_error::sharing_violation)
result = file_status(file_type::type_unknown);
else {
result = file_status(file_type::status_error);
return ec;
}
return success;
}
error_code unique_file(const Twine &model, int &result_fd,
SmallVectorImpl<char> &result_path,
bool makeAbsolute) {
// Use result_path as temp storage.
result_path.set_size(0);
StringRef m = model.toStringRef(result_path);
SmallVector<wchar_t, 128> model_utf16;
if (error_code ec = UTF8ToUTF16(m, model_utf16)) return ec;
if (makeAbsolute) {
// Make model absolute by prepending a temp directory if it's not already.
bool absolute = path::is_absolute(m);
if (!absolute) {
SmallVector<wchar_t, 64> temp_dir;
if (error_code ec = TempDir(temp_dir)) return ec;
// Handle c: by removing it.
if (model_utf16.size() > 2 && model_utf16[1] == L':') {
model_utf16.erase(model_utf16.begin(), model_utf16.begin() + 2);
}
model_utf16.insert(model_utf16.begin(), temp_dir.begin(), temp_dir.end());
}
}
// Replace '%' with random chars. From here on, DO NOT modify model. It may be
// needed if the randomly chosen path already exists.
SmallVector<wchar_t, 128> random_path_utf16;
// Get a Crypto Provider for CryptGenRandom.
HCRYPTPROV HCPC;
if (!::CryptAcquireContextW(&HCPC,
NULL,
NULL,
PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT))
return windows_error(::GetLastError());
ScopedCryptContext CryptoProvider(HCPC);
retry_random_path:
random_path_utf16.set_size(0);
for (SmallVectorImpl<wchar_t>::const_iterator i = model_utf16.begin(),
e = model_utf16.end();
i != e; ++i) {
if (*i == L'%') {
BYTE val = 0;
if (!::CryptGenRandom(CryptoProvider, 1, &val))
return windows_error(::GetLastError());
random_path_utf16.push_back("0123456789abcdef"[val & 15]);
}
else
random_path_utf16.push_back(*i);
}
// Make random_path_utf16 null terminated.
random_path_utf16.push_back(0);
random_path_utf16.pop_back();
// Try to create + open the path.
retry_create_file:
HANDLE TempFileHandle = ::CreateFileW(random_path_utf16.begin(),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
// Return ERROR_FILE_EXISTS if the file
// already exists.
CREATE_NEW,
FILE_ATTRIBUTE_TEMPORARY,
NULL);
if (TempFileHandle == INVALID_HANDLE_VALUE) {
// If the file existed, try again, otherwise, error.
error_code ec = windows_error(::GetLastError());
if (ec == windows_error::file_exists)
goto retry_random_path;
// Check for non-existing parent directories.
if (ec == windows_error::path_not_found) {
// Create the directories using result_path as temp storage.
if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
random_path_utf16.size(), result_path))
return ec;
StringRef p(result_path.begin(), result_path.size());
SmallString<64> dir_to_create;
for (path::const_iterator i = path::begin(p),
e = --path::end(p); i != e; ++i) {
path::append(dir_to_create, *i);
bool Exists;
if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec;
if (!Exists) {
// If c: doesn't exist, bail.
if (i->endswith(":"))
return ec;
SmallVector<wchar_t, 64> dir_to_create_utf16;
if (error_code ec = UTF8ToUTF16(dir_to_create, dir_to_create_utf16))
return ec;
// Create the directory.
if (!::CreateDirectoryW(dir_to_create_utf16.begin(), NULL))
return windows_error(::GetLastError());
}
}
goto retry_create_file;
}
return ec;
}
// Set result_path to the utf-8 representation of the path.
if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
random_path_utf16.size(), result_path)) {
::CloseHandle(TempFileHandle);
::DeleteFileW(random_path_utf16.begin());
return ec;
}
// Convert the Windows API file handle into a C-runtime handle.
int fd = ::_open_osfhandle(intptr_t(TempFileHandle), 0);
if (fd == -1) {
::CloseHandle(TempFileHandle);
::DeleteFileW(random_path_utf16.begin());
// MSDN doesn't say anything about _open_osfhandle setting errno or
// GetLastError(), so just return invalid_handle.
return windows_error::invalid_handle;
}
result_fd = fd;
return success;
}
error_code get_magic(const Twine &path, uint32_t len,
SmallVectorImpl<char> &result) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
result.set_size(0);
// Convert path to UTF-16.
if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
path_utf16))
return ec;
// Open file.
HANDLE file = ::CreateFileW(c_str(path_utf16),
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_READONLY,
NULL);
if (file == INVALID_HANDLE_VALUE)
return windows_error(::GetLastError());
// Allocate buffer.
result.reserve(len);
// Get magic!
DWORD bytes_read = 0;
BOOL read_success = ::ReadFile(file, result.data(), len, &bytes_read, NULL);
error_code ec = windows_error(::GetLastError());
::CloseHandle(file);
if (!read_success || (bytes_read != len)) {
// Set result size to the number of bytes read if it's valid.
if (bytes_read <= len)
result.set_size(bytes_read);
// ERROR_HANDLE_EOF is mapped to errc::value_too_large.
return ec;
}
result.set_size(len);
return success;
}
error_code directory_iterator_construct(directory_iterator &it, StringRef path){
SmallVector<wchar_t, 128> path_utf16;
if (error_code ec = UTF8ToUTF16(path,
path_utf16))
return ec;
// Convert path to the format that Windows is happy with.
if (path_utf16.size() > 0 &&
!is_separator(path_utf16[path.size() - 1]) &&
path_utf16[path.size() - 1] != L':') {
path_utf16.push_back(L'\\');
path_utf16.push_back(L'*');
} else {
path_utf16.push_back(L'*');
}
// Get the first directory entry.
WIN32_FIND_DATAW FirstFind;
ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
if (!FindHandle)
return windows_error(::GetLastError());
size_t FilenameLen = ::wcslen(FirstFind.cFileName);
while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
(FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
FirstFind.cFileName[1] == L'.'))
if (!::FindNextFileW(FindHandle, &FirstFind)) {
error_code ec = windows_error(::GetLastError());
// Check for end.
if (ec == windows_error::no_more_files)
return directory_iterator_destruct(it);
return ec;
} else
FilenameLen = ::wcslen(FirstFind.cFileName);
// Construct the current directory entry.
SmallString<128> directory_entry_name_utf8;
if (error_code ec = UTF16ToUTF8(FirstFind.cFileName,
::wcslen(FirstFind.cFileName),
directory_entry_name_utf8))
return ec;
it.IterationHandle = intptr_t(FindHandle.take());
SmallString<128> directory_entry_path(path);
path::append(directory_entry_path, directory_entry_name_utf8.str());
it.CurrentEntry = directory_entry(directory_entry_path.str());
return success;
}
error_code directory_iterator_destruct(directory_iterator& it) {
if (it.IterationHandle != 0)
// Closes the handle if it's valid.
ScopedFindHandle close(HANDLE(it.IterationHandle));
it.IterationHandle = 0;
it.CurrentEntry = directory_entry();
return success;
}
error_code directory_iterator_increment(directory_iterator& it) {
WIN32_FIND_DATAW FindData;
if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
error_code ec = windows_error(::GetLastError());
// Check for end.
if (ec == windows_error::no_more_files)
return directory_iterator_destruct(it);
return ec;
}
size_t FilenameLen = ::wcslen(FindData.cFileName);
if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
(FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
FindData.cFileName[1] == L'.'))
return directory_iterator_increment(it);
SmallString<128> directory_entry_path_utf8;
if (error_code ec = UTF16ToUTF8(FindData.cFileName,
::wcslen(FindData.cFileName),
directory_entry_path_utf8))
return ec;
it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
return success;
}
} // end namespace fs
} // end namespace sys
} // end namespace llvm
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