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

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//===- llvm/Support/Windows/Path.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 Path API.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only generic Windows code that
//=== is guaranteed to work on *all* Windows variants.
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "Windows.h"
#include <fcntl.h>
#include <io.h>
#include <sys/stat.h>
#include <sys/types.h>
#undef max
// MinGW doesn't define this.
#ifndef _ERRNO_T_DEFINED
#define _ERRNO_T_DEFINED
typedef int errno_t;
#endif
#ifdef _MSC_VER
# pragma comment(lib, "advapi32.lib") // This provides CryptAcquireContextW.
#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 error_code::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 error_code::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 error_code::success();
}
bool is_separator(const wchar_t value) {
switch (value) {
case L'\\':
case L'/':
return true;
default:
return false;
}
}
}
// FIXME: mode should be used here and default to user r/w only,
// it currently comes in as a UNIX mode.
static error_code createUniqueEntity(const Twine &model, int &result_fd,
SmallVectorImpl<char> &result_path,
bool makeAbsolute, unsigned mode,
FSEntity Type) {
// 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 = sys::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();
HANDLE TempFileHandle = INVALID_HANDLE_VALUE;
switch (Type) {
case FS_File: {
// Try to create + open the path.
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;
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;
break;
}
case FS_Name: {
DWORD attributes = ::GetFileAttributesW(random_path_utf16.begin());
if (attributes != INVALID_FILE_ATTRIBUTES)
goto retry_random_path;
error_code EC = make_error_code(windows_error(::GetLastError()));
if (EC != windows_error::file_not_found &&
EC != windows_error::path_not_found)
return EC;
break;
}
case FS_Dir:
if (!::CreateDirectoryW(random_path_utf16.begin(), NULL)) {
error_code EC = windows_error(::GetLastError());
if (EC != windows_error::already_exists)
return EC;
goto retry_random_path;
}
break;
}
// 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)) {
switch (Type) {
case FS_File:
::CloseHandle(TempFileHandle);
::DeleteFileW(random_path_utf16.begin());
case FS_Name:
break;
case FS_Dir:
::RemoveDirectoryW(random_path_utf16.begin());
break;
}
return ec;
}
return error_code::success();
}
namespace llvm {
namespace sys {
namespace fs {
std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
char pathname[MAX_PATH];
DWORD ret = ::GetModuleFileNameA(NULL, pathname, MAX_PATH);
return ret != MAX_PATH ? pathname : "";
}
UniqueID file_status::getUniqueID() const {
// The file is uniquely identified by the volume serial number along
// with the 64-bit file identifier.
uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) |
static_cast<uint64_t>(FileIndexLow);
return UniqueID(VolumeSerialNumber, FileID);
}
TimeValue file_status::getLastModificationTime() const {
ULARGE_INTEGER UI;
UI.LowPart = LastWriteTimeLow;
UI.HighPart = LastWriteTimeHigh;
TimeValue Ret;
Ret.fromWin32Time(UI.QuadPart);
return Ret;
}
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 error_code::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 error_code::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 error_code::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 error_code::success();
}
error_code remove(const Twine &path, bool &existed) {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
file_status st;
error_code EC = status(path, st);
if (EC) {
if (EC == windows_error::file_not_found ||
EC == windows_error::path_not_found) {
existed = false;
return error_code::success();
}
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 error_code::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;
error_code ec = error_code::success();
for (int i = 0; i < 2000; i++) {
if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
return error_code::success();
ec = windows_error(::GetLastError());
if (ec != windows_error::access_denied)
break;
// Retry MoveFile() at ACCESS_DENIED.
// System scanners (eg. indexer) might open the source file when
// It is written and closed.
::Sleep(1);
}
return ec;
}
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 | _O_RDWR, 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 error_code::success();
}
bool can_write(const Twine &Path) {
// FIXME: take security attributes into account.
SmallString<128> PathStorage;
SmallVector<wchar_t, 128> PathUtf16;
if (UTF8ToUTF16(Path.toStringRef(PathStorage), PathUtf16))
return false;
DWORD Attr = ::GetFileAttributesW(PathUtf16.begin());
return (Attr != INVALID_FILE_ATTRIBUTES) && !(Attr & FILE_ATTRIBUTE_READONLY);
}
bool can_execute(const Twine &Path) {
SmallString<128> PathStorage;
SmallVector<wchar_t, 128> PathUtf16;
if (UTF8ToUTF16(Path.toStringRef(PathStorage), PathUtf16))
return false;
DWORD Attr = ::GetFileAttributesW(PathUtf16.begin());
return Attr != INVALID_FILE_ATTRIBUTES;
}
bool equivalent(file_status A, file_status B) {
assert(status_known(A) && status_known(B));
return A.FileIndexHigh == B.FileIndexHigh &&
A.FileIndexLow == B.FileIndexLow &&
A.FileSizeHigh == B.FileSizeHigh &&
A.FileSizeLow == B.FileSizeLow &&
A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
A.LastWriteTimeLow == B.LastWriteTimeLow &&
A.VolumeSerialNumber == B.VolumeSerialNumber;
}
error_code equivalent(const Twine &A, const Twine &B, bool &result) {
file_status fsA, fsB;
if (error_code ec = status(A, fsA)) return ec;
if (error_code ec = status(B, fsB)) return ec;
result = equivalent(fsA, fsB);
return error_code::success();
}
static bool isReservedName(StringRef path) {
// This list of reserved names comes from MSDN, at:
// http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
"com1", "com2", "com3", "com4", "com5", "com6",
"com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
"lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
// First, check to see if this is a device namespace, which always
// starts with \\.\, since device namespaces are not legal file paths.
if (path.startswith("\\\\.\\"))
return true;
// Then compare against the list of ancient reserved names
for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
if (path.equals_lower(sReservedNames[i]))
return true;
}
// The path isn't what we consider reserved.
return false;
}
static error_code getStatus(HANDLE FileHandle, file_status &Result) {
if (FileHandle == INVALID_HANDLE_VALUE)
goto handle_status_error;
switch (::GetFileType(FileHandle)) {
default:
llvm_unreachable("Don't know anything about this file type");
case FILE_TYPE_UNKNOWN: {
DWORD Err = ::GetLastError();
if (Err != NO_ERROR)
return windows_error(Err);
Result = file_status(file_type::type_unknown);
return error_code::success();
}
case FILE_TYPE_DISK:
break;
case FILE_TYPE_CHAR:
Result = file_status(file_type::character_file);
return error_code::success();
case FILE_TYPE_PIPE:
Result = file_status(file_type::fifo_file);
return error_code::success();
}
BY_HANDLE_FILE_INFORMATION Info;
if (!::GetFileInformationByHandle(FileHandle, &Info))
goto handle_status_error;
{
file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
? file_type::directory_file
: file_type::regular_file;
Result =
file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
Info.ftLastWriteTime.dwLowDateTime,
Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
return error_code::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;
}
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);
if (isReservedName(path8)) {
result = file_status(file_type::character_file);
return error_code::success();
}
if (error_code ec = UTF8ToUTF16(path8, path_utf16))
return ec;
DWORD attr = ::GetFileAttributesW(path_utf16.begin());
if (attr == INVALID_FILE_ATTRIBUTES)
return getStatus(INVALID_HANDLE_VALUE, result);
// Handle reparse points.
if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
ScopedFileHandle 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)
return getStatus(INVALID_HANDLE_VALUE, result);
}
ScopedFileHandle 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)
return getStatus(INVALID_HANDLE_VALUE, result);
return getStatus(h, result);
}
error_code status(int FD, file_status &Result) {
HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
return getStatus(FileHandle, Result);
}
error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
ULARGE_INTEGER UI;
UI.QuadPart = Time.toWin32Time();
FILETIME FT;
FT.dwLowDateTime = UI.LowPart;
FT.dwHighDateTime = UI.HighPart;
HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
if (!SetFileTime(FileHandle, NULL, &FT, &FT))
return windows_error(::GetLastError());
return error_code::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 error_code::success();
}
error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) {
FileDescriptor = FD;
// Make sure that the requested size fits within SIZE_T.
if (Size > std::numeric_limits<SIZE_T>::max()) {
if (FileDescriptor) {
if (CloseFD)
_close(FileDescriptor);
} else
::CloseHandle(FileHandle);
return make_error_code(errc::invalid_argument);
}
DWORD flprotect;
switch (Mode) {
case readonly: flprotect = PAGE_READONLY; break;
case readwrite: flprotect = PAGE_READWRITE; break;
case priv: flprotect = PAGE_WRITECOPY; break;
}
FileMappingHandle = ::CreateFileMapping(FileHandle,
0,
flprotect,
Size >> 32,
Size & 0xffffffff,
0);
if (FileMappingHandle == NULL) {
error_code ec = windows_error(GetLastError());
if (FileDescriptor) {
if (CloseFD)
_close(FileDescriptor);
} else
::CloseHandle(FileHandle);
return ec;
}
DWORD dwDesiredAccess;
switch (Mode) {
case readonly: dwDesiredAccess = FILE_MAP_READ; break;
case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
case priv: dwDesiredAccess = FILE_MAP_COPY; break;
}
Mapping = ::MapViewOfFile(FileMappingHandle,
dwDesiredAccess,
Offset >> 32,
Offset & 0xffffffff,
Size);
if (Mapping == NULL) {
error_code ec = windows_error(GetLastError());
::CloseHandle(FileMappingHandle);
if (FileDescriptor) {
if (CloseFD)
_close(FileDescriptor);
} else
::CloseHandle(FileHandle);
return ec;
}
if (Size == 0) {
MEMORY_BASIC_INFORMATION mbi;
SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
if (Result == 0) {
error_code ec = windows_error(GetLastError());
::UnmapViewOfFile(Mapping);
::CloseHandle(FileMappingHandle);
if (FileDescriptor) {
if (CloseFD)
_close(FileDescriptor);
} else
::CloseHandle(FileHandle);
return ec;
}
Size = mbi.RegionSize;
}
// Close all the handles except for the view. It will keep the other handles
// alive.
::CloseHandle(FileMappingHandle);
if (FileDescriptor) {
if (CloseFD)
_close(FileDescriptor); // Also closes FileHandle.
} else
::CloseHandle(FileHandle);
return error_code::success();
}
mapped_file_region::mapped_file_region(const Twine &path,
mapmode mode,
uint64_t length,
uint64_t offset,
error_code &ec)
: Mode(mode)
, Size(length)
, Mapping()
, FileDescriptor()
, FileHandle(INVALID_HANDLE_VALUE)
, FileMappingHandle() {
SmallString<128> path_storage;
SmallVector<wchar_t, 128> path_utf16;
// Convert path to UTF-16.
if ((ec = UTF8ToUTF16(path.toStringRef(path_storage), path_utf16)))
return;
// Get file handle for creating a file mapping.
FileHandle = ::CreateFileW(c_str(path_utf16),
Mode == readonly ? GENERIC_READ
: GENERIC_READ | GENERIC_WRITE,
Mode == readonly ? FILE_SHARE_READ
: 0,
0,
Mode == readonly ? OPEN_EXISTING
: OPEN_ALWAYS,
Mode == readonly ? FILE_ATTRIBUTE_READONLY
: FILE_ATTRIBUTE_NORMAL,
0);
if (FileHandle == INVALID_HANDLE_VALUE) {
ec = windows_error(::GetLastError());
return;
}
FileDescriptor = 0;
ec = init(FileDescriptor, true, offset);
if (ec) {
Mapping = FileMappingHandle = 0;
FileHandle = INVALID_HANDLE_VALUE;
FileDescriptor = 0;
}
}
mapped_file_region::mapped_file_region(int fd,
bool closefd,
mapmode mode,
uint64_t length,
uint64_t offset,
error_code &ec)
: Mode(mode)
, Size(length)
, Mapping()
, FileDescriptor(fd)
, FileHandle(INVALID_HANDLE_VALUE)
, FileMappingHandle() {
FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
if (FileHandle == INVALID_HANDLE_VALUE) {
if (closefd)
_close(FileDescriptor);
FileDescriptor = 0;
ec = make_error_code(errc::bad_file_descriptor);
return;
}
ec = init(FileDescriptor, closefd, offset);
if (ec) {
Mapping = FileMappingHandle = 0;
FileHandle = INVALID_HANDLE_VALUE;
FileDescriptor = 0;
}
}
mapped_file_region::~mapped_file_region() {
if (Mapping)
::UnmapViewOfFile(Mapping);
}
#if LLVM_HAS_RVALUE_REFERENCES
mapped_file_region::mapped_file_region(mapped_file_region &&other)
: Mode(other.Mode)
, Size(other.Size)
, Mapping(other.Mapping)
, FileDescriptor(other.FileDescriptor)
, FileHandle(other.FileHandle)
, FileMappingHandle(other.FileMappingHandle) {
other.Mapping = other.FileMappingHandle = 0;
other.FileHandle = INVALID_HANDLE_VALUE;
other.FileDescriptor = 0;
}
#endif
mapped_file_region::mapmode mapped_file_region::flags() const {
assert(Mapping && "Mapping failed but used anyway!");
return Mode;
}
uint64_t mapped_file_region::size() const {
assert(Mapping && "Mapping failed but used anyway!");
return Size;
}
char *mapped_file_region::data() const {
assert(Mode != readonly && "Cannot get non const data for readonly mapping!");
assert(Mapping && "Mapping failed but used anyway!");
return reinterpret_cast<char*>(Mapping);
}
const char *mapped_file_region::const_data() const {
assert(Mapping && "Mapping failed but used anyway!");
return reinterpret_cast<const char*>(Mapping);
}
int mapped_file_region::alignment() {
SYSTEM_INFO SysInfo;
::GetSystemInfo(&SysInfo);
return SysInfo.dwAllocationGranularity;
}
error_code detail::directory_iterator_construct(detail::DirIterState &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 detail::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 error_code::success();
}
error_code detail::directory_iterator_destruct(detail::DirIterState &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 error_code::success();
}
error_code detail::directory_iterator_increment(detail::DirIterState &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 detail::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 error_code::success();
}
error_code map_file_pages(const Twine &path, off_t file_offset, size_t size,
bool map_writable, void *&result) {
assert(0 && "NOT IMPLEMENTED");
return windows_error::invalid_function;
}
error_code unmap_file_pages(void *base, size_t size) {
assert(0 && "NOT IMPLEMENTED");
return windows_error::invalid_function;
}
error_code openFileForRead(const Twine &Name, int &ResultFD) {
SmallString<128> PathStorage;
SmallVector<wchar_t, 128> PathUTF16;
if (error_code EC = UTF8ToUTF16(Name.toStringRef(PathStorage),
PathUTF16))
return EC;
HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (H == INVALID_HANDLE_VALUE) {
error_code EC = windows_error(::GetLastError());
// Provide a better error message when trying to open directories.
// This only runs if we failed to open the file, so there is probably
// no performances issues.
if (EC != windows_error::access_denied)
return EC;
if (is_directory(Name))
return error_code(errc::is_a_directory, posix_category());
return EC;
}
int FD = ::_open_osfhandle(intptr_t(H), 0);
if (FD == -1) {
::CloseHandle(H);
return windows_error::invalid_handle;
}
ResultFD = FD;
return error_code::success();
}
error_code openFileForWrite(const Twine &Name, int &ResultFD,
sys::fs::OpenFlags Flags, unsigned Mode) {
// Verify that we don't have both "append" and "excl".
assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
"Cannot specify both 'excl' and 'append' file creation flags!");
SmallString<128> PathStorage;
SmallVector<wchar_t, 128> PathUTF16;
if (error_code EC = UTF8ToUTF16(Name.toStringRef(PathStorage),
PathUTF16))
return EC;
DWORD CreationDisposition;
if (Flags & F_Excl)
CreationDisposition = CREATE_NEW;
else if (Flags & F_Append)
CreationDisposition = OPEN_ALWAYS;
else
CreationDisposition = CREATE_ALWAYS;
HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
if (H == INVALID_HANDLE_VALUE) {
error_code EC = windows_error(::GetLastError());
// Provide a better error message when trying to open directories.
// This only runs if we failed to open the file, so there is probably
// no performances issues.
if (EC != windows_error::access_denied)
return EC;
if (is_directory(Name))
return error_code(errc::is_a_directory, posix_category());
return EC;
}
int OpenFlags = 0;
if (Flags & F_Append)
OpenFlags |= _O_APPEND;
if (!(Flags & F_Binary))
OpenFlags |= _O_TEXT;
int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
if (FD == -1) {
::CloseHandle(H);
return windows_error::invalid_handle;
}
ResultFD = FD;
return error_code::success();
}
} // end namespace fs
} // end namespace sys
} // end namespace llvm
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