forked from OSchip/llvm-project
1210 lines
38 KiB
C++
1210 lines
38 KiB
C++
//===- llvm/Support/Windows/Path.inc - Windows Path Impl --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Windows specific implementation of the Path API.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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//=== WARNING: Implementation here must contain only generic Windows code that
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//=== is guaranteed to work on *all* Windows variants.
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Support/WindowsError.h"
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#include <fcntl.h>
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#include <io.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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// These two headers must be included last, and make sure shlobj is required
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// after Windows.h to make sure it picks up our definition of _WIN32_WINNT
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#include "WindowsSupport.h"
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#include <shellapi.h>
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#include <shlobj.h>
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#undef max
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// MinGW doesn't define this.
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#ifndef _ERRNO_T_DEFINED
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#define _ERRNO_T_DEFINED
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typedef int errno_t;
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#endif
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#ifdef _MSC_VER
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# pragma comment(lib, "advapi32.lib") // This provides CryptAcquireContextW.
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# pragma comment(lib, "ole32.lib") // This provides CoTaskMemFree
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#endif
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using namespace llvm;
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using llvm::sys::windows::UTF8ToUTF16;
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using llvm::sys::windows::UTF16ToUTF8;
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using llvm::sys::path::widenPath;
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static bool is_separator(const wchar_t value) {
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switch (value) {
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case L'\\':
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case L'/':
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return true;
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default:
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return false;
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}
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}
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namespace llvm {
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namespace sys {
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namespace path {
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// Convert a UTF-8 path to UTF-16. Also, if the absolute equivalent of the
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// path is longer than CreateDirectory can tolerate, make it absolute and
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// prefixed by '\\?\'.
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std::error_code widenPath(const Twine &Path8,
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SmallVectorImpl<wchar_t> &Path16) {
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const size_t MaxDirLen = MAX_PATH - 12; // Must leave room for 8.3 filename.
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// Several operations would convert Path8 to SmallString; more efficient to
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// do it once up front.
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SmallString<128> Path8Str;
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Path8.toVector(Path8Str);
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// If we made this path absolute, how much longer would it get?
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size_t CurPathLen;
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if (llvm::sys::path::is_absolute(Twine(Path8Str)))
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CurPathLen = 0; // No contribution from current_path needed.
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else {
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CurPathLen = ::GetCurrentDirectoryW(0, NULL);
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if (CurPathLen == 0)
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return mapWindowsError(::GetLastError());
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}
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// Would the absolute path be longer than our limit?
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if ((Path8Str.size() + CurPathLen) >= MaxDirLen &&
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!Path8Str.startswith("\\\\?\\")) {
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SmallString<2*MAX_PATH> FullPath("\\\\?\\");
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if (CurPathLen) {
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SmallString<80> CurPath;
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if (std::error_code EC = llvm::sys::fs::current_path(CurPath))
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return EC;
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FullPath.append(CurPath);
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}
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// Traverse the requested path, canonicalizing . and .. as we go (because
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// the \\?\ prefix is documented to treat them as real components).
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// The iterators don't report separators and append() always attaches
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// preferred_separator so we don't need to call native() on the result.
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for (llvm::sys::path::const_iterator I = llvm::sys::path::begin(Path8Str),
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E = llvm::sys::path::end(Path8Str);
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I != E; ++I) {
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if (I->size() == 1 && *I == ".")
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continue;
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if (I->size() == 2 && *I == "..")
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llvm::sys::path::remove_filename(FullPath);
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else
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llvm::sys::path::append(FullPath, *I);
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}
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return UTF8ToUTF16(FullPath, Path16);
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}
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// Just use the caller's original path.
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return UTF8ToUTF16(Path8Str, Path16);
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}
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} // end namespace path
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namespace fs {
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std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
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SmallVector<wchar_t, MAX_PATH> PathName;
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DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity());
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// A zero return value indicates a failure other than insufficient space.
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if (Size == 0)
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return "";
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// Insufficient space is determined by a return value equal to the size of
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// the buffer passed in.
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if (Size == PathName.capacity())
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return "";
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// On success, GetModuleFileNameW returns the number of characters written to
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// the buffer not including the NULL terminator.
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PathName.set_size(Size);
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// Convert the result from UTF-16 to UTF-8.
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SmallVector<char, MAX_PATH> PathNameUTF8;
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if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8))
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return "";
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return std::string(PathNameUTF8.data());
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}
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UniqueID file_status::getUniqueID() const {
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// The file is uniquely identified by the volume serial number along
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// with the 64-bit file identifier.
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uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) |
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static_cast<uint64_t>(FileIndexLow);
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return UniqueID(VolumeSerialNumber, FileID);
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}
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ErrorOr<space_info> disk_space(const Twine &Path) {
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ULARGE_INTEGER Avail, Total, Free;
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if (!::GetDiskFreeSpaceExA(Path.str().c_str(), &Avail, &Total, &Free))
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return mapWindowsError(::GetLastError());
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space_info SpaceInfo;
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SpaceInfo.capacity =
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(static_cast<uint64_t>(Total.HighPart) << 32) + Total.LowPart;
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SpaceInfo.free = (static_cast<uint64_t>(Free.HighPart) << 32) + Free.LowPart;
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SpaceInfo.available =
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(static_cast<uint64_t>(Avail.HighPart) << 32) + Avail.LowPart;
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return SpaceInfo;
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}
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TimePoint<> file_status::getLastAccessedTime() const {
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FILETIME Time;
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Time.dwLowDateTime = LastAccessedTimeLow;
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Time.dwHighDateTime = LastAccessedTimeHigh;
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return toTimePoint(Time);
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}
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TimePoint<> file_status::getLastModificationTime() const {
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FILETIME Time;
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Time.dwLowDateTime = LastWriteTimeLow;
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Time.dwHighDateTime = LastWriteTimeHigh;
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return toTimePoint(Time);
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}
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uint32_t file_status::getLinkCount() const {
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return NumLinks;
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}
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std::error_code current_path(SmallVectorImpl<char> &result) {
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SmallVector<wchar_t, MAX_PATH> cur_path;
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DWORD len = MAX_PATH;
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do {
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cur_path.reserve(len);
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len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
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// A zero return value indicates a failure other than insufficient space.
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if (len == 0)
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return mapWindowsError(::GetLastError());
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// If there's insufficient space, the len returned is larger than the len
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// given.
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} while (len > cur_path.capacity());
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// On success, GetCurrentDirectoryW returns the number of characters not
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// including the null-terminator.
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cur_path.set_size(len);
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return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result);
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}
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std::error_code set_current_path(const Twine &path) {
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// Convert to utf-16.
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SmallVector<wchar_t, 128> wide_path;
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if (std::error_code ec = widenPath(path, wide_path))
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return ec;
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if (!::SetCurrentDirectoryW(wide_path.begin()))
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return mapWindowsError(::GetLastError());
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return std::error_code();
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}
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std::error_code create_directory(const Twine &path, bool IgnoreExisting,
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perms Perms) {
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SmallVector<wchar_t, 128> path_utf16;
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if (std::error_code ec = widenPath(path, path_utf16))
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return ec;
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if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
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DWORD LastError = ::GetLastError();
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if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
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return mapWindowsError(LastError);
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}
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return std::error_code();
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}
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// We can't use symbolic links for windows.
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std::error_code create_link(const Twine &to, const Twine &from) {
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// Convert to utf-16.
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SmallVector<wchar_t, 128> wide_from;
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SmallVector<wchar_t, 128> wide_to;
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if (std::error_code ec = widenPath(from, wide_from))
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return ec;
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if (std::error_code ec = widenPath(to, wide_to))
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return ec;
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if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
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return mapWindowsError(::GetLastError());
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return std::error_code();
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}
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std::error_code create_hard_link(const Twine &to, const Twine &from) {
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return create_link(to, from);
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}
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std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
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SmallVector<wchar_t, 128> path_utf16;
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file_status ST;
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if (std::error_code EC = status(path, ST)) {
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if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
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return EC;
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return std::error_code();
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}
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if (std::error_code ec = widenPath(path, path_utf16))
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return ec;
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if (ST.type() == file_type::directory_file) {
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if (!::RemoveDirectoryW(c_str(path_utf16))) {
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std::error_code EC = mapWindowsError(::GetLastError());
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if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
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return EC;
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}
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return std::error_code();
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}
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if (!::DeleteFileW(c_str(path_utf16))) {
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std::error_code EC = mapWindowsError(::GetLastError());
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if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
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return EC;
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}
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return std::error_code();
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}
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static std::error_code is_local_internal(SmallVectorImpl<wchar_t> &Path,
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bool &Result) {
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SmallVector<wchar_t, 128> VolumePath;
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size_t Len = 128;
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while (true) {
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VolumePath.resize(Len);
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BOOL Success =
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::GetVolumePathNameW(Path.data(), VolumePath.data(), VolumePath.size());
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if (Success)
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break;
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DWORD Err = ::GetLastError();
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if (Err != ERROR_INSUFFICIENT_BUFFER)
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return mapWindowsError(Err);
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Len *= 2;
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}
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// If the output buffer has exactly enough space for the path name, but not
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// the null terminator, it will leave the output unterminated. Push a null
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// terminator onto the end to ensure that this never happens.
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VolumePath.push_back(L'\0');
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VolumePath.set_size(wcslen(VolumePath.data()));
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const wchar_t *P = VolumePath.data();
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UINT Type = ::GetDriveTypeW(P);
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switch (Type) {
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case DRIVE_FIXED:
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Result = true;
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return std::error_code();
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case DRIVE_REMOTE:
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case DRIVE_CDROM:
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case DRIVE_RAMDISK:
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case DRIVE_REMOVABLE:
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Result = false;
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return std::error_code();
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default:
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return make_error_code(errc::no_such_file_or_directory);
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}
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llvm_unreachable("Unreachable!");
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}
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std::error_code is_local(const Twine &path, bool &result) {
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if (!llvm::sys::fs::exists(path) || !llvm::sys::path::has_root_path(path))
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return make_error_code(errc::no_such_file_or_directory);
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SmallString<128> Storage;
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StringRef P = path.toStringRef(Storage);
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// Convert to utf-16.
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SmallVector<wchar_t, 128> WidePath;
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if (std::error_code ec = widenPath(P, WidePath))
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return ec;
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return is_local_internal(WidePath, result);
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}
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std::error_code is_local(int FD, bool &Result) {
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SmallVector<wchar_t, 128> FinalPath;
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HANDLE Handle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
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size_t Len = 128;
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do {
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FinalPath.reserve(Len);
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Len = ::GetFinalPathNameByHandleW(Handle, FinalPath.data(),
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FinalPath.capacity() - 1, VOLUME_NAME_NT);
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if (Len == 0)
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return mapWindowsError(::GetLastError());
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} while (Len > FinalPath.capacity());
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FinalPath.set_size(Len);
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return is_local_internal(FinalPath, Result);
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}
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std::error_code rename(const Twine &from, const Twine &to) {
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// Convert to utf-16.
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SmallVector<wchar_t, 128> wide_from;
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SmallVector<wchar_t, 128> wide_to;
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if (std::error_code ec = widenPath(from, wide_from))
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return ec;
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if (std::error_code ec = widenPath(to, wide_to))
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return ec;
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std::error_code ec = std::error_code();
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// Retry while we see recoverable errors.
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// System scanners (eg. indexer) might open the source file when it is written
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// and closed.
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bool TryReplace = true;
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for (int i = 0; i < 2000; i++) {
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if (i > 0)
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::Sleep(1);
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if (TryReplace) {
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// Try ReplaceFile first, as it is able to associate a new data stream
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// with the destination even if the destination file is currently open.
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if (::ReplaceFileW(wide_to.data(), wide_from.data(), NULL, 0, NULL, NULL))
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return std::error_code();
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DWORD ReplaceError = ::GetLastError();
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ec = mapWindowsError(ReplaceError);
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// If ReplaceFileW returned ERROR_UNABLE_TO_MOVE_REPLACEMENT or
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// ERROR_UNABLE_TO_MOVE_REPLACEMENT_2, retry but only use MoveFileExW().
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if (ReplaceError == ERROR_UNABLE_TO_MOVE_REPLACEMENT ||
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ReplaceError == ERROR_UNABLE_TO_MOVE_REPLACEMENT_2) {
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TryReplace = false;
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continue;
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}
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// If ReplaceFileW returned ERROR_UNABLE_TO_REMOVE_REPLACED, retry
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// using ReplaceFileW().
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if (ReplaceError == ERROR_UNABLE_TO_REMOVE_REPLACED)
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continue;
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// We get ERROR_FILE_NOT_FOUND if the destination file is missing.
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// MoveFileEx can handle this case.
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if (ReplaceError != ERROR_ACCESS_DENIED &&
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ReplaceError != ERROR_FILE_NOT_FOUND &&
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ReplaceError != ERROR_SHARING_VIOLATION)
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break;
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}
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if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
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MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
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return std::error_code();
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DWORD MoveError = ::GetLastError();
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ec = mapWindowsError(MoveError);
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if (MoveError != ERROR_ACCESS_DENIED) break;
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}
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return ec;
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}
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std::error_code resize_file(int FD, uint64_t Size) {
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#ifdef HAVE__CHSIZE_S
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errno_t error = ::_chsize_s(FD, Size);
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#else
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errno_t error = ::_chsize(FD, Size);
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#endif
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return std::error_code(error, std::generic_category());
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}
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std::error_code access(const Twine &Path, AccessMode Mode) {
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SmallVector<wchar_t, 128> PathUtf16;
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if (std::error_code EC = widenPath(Path, PathUtf16))
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return EC;
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DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
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if (Attributes == INVALID_FILE_ATTRIBUTES) {
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// See if the file didn't actually exist.
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DWORD LastError = ::GetLastError();
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if (LastError != ERROR_FILE_NOT_FOUND &&
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LastError != ERROR_PATH_NOT_FOUND)
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return mapWindowsError(LastError);
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return errc::no_such_file_or_directory;
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}
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if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
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return errc::permission_denied;
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return std::error_code();
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}
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bool can_execute(const Twine &Path) {
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return !access(Path, AccessMode::Execute) ||
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!access(Path + ".exe", AccessMode::Execute);
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}
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bool equivalent(file_status A, file_status B) {
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assert(status_known(A) && status_known(B));
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return A.FileIndexHigh == B.FileIndexHigh &&
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A.FileIndexLow == B.FileIndexLow &&
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A.FileSizeHigh == B.FileSizeHigh &&
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A.FileSizeLow == B.FileSizeLow &&
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A.LastAccessedTimeHigh == B.LastAccessedTimeHigh &&
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A.LastAccessedTimeLow == B.LastAccessedTimeLow &&
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A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
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A.LastWriteTimeLow == B.LastWriteTimeLow &&
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A.VolumeSerialNumber == B.VolumeSerialNumber;
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}
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std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
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file_status fsA, fsB;
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if (std::error_code ec = status(A, fsA))
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return ec;
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if (std::error_code ec = status(B, fsB))
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return ec;
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result = equivalent(fsA, fsB);
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return std::error_code();
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}
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static bool isReservedName(StringRef path) {
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// This list of reserved names comes from MSDN, at:
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// http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
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static const char *const sReservedNames[] = { "nul", "con", "prn", "aux",
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"com1", "com2", "com3", "com4",
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"com5", "com6", "com7", "com8",
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"com9", "lpt1", "lpt2", "lpt3",
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"lpt4", "lpt5", "lpt6", "lpt7",
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"lpt8", "lpt9" };
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|
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// First, check to see if this is a device namespace, which always
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// starts with \\.\, since device namespaces are not legal file paths.
|
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if (path.startswith("\\\\.\\"))
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return true;
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|
|
// 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 std::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 mapWindowsError(Err);
|
|
Result = file_status(file_type::type_unknown);
|
|
return std::error_code();
|
|
}
|
|
case FILE_TYPE_DISK:
|
|
break;
|
|
case FILE_TYPE_CHAR:
|
|
Result = file_status(file_type::character_file);
|
|
return std::error_code();
|
|
case FILE_TYPE_PIPE:
|
|
Result = file_status(file_type::fifo_file);
|
|
return std::error_code();
|
|
}
|
|
|
|
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;
|
|
perms Permissions = (Info.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
|
|
? (all_read | all_exe)
|
|
: all_all;
|
|
Result = file_status(
|
|
Type, Permissions, Info.nNumberOfLinks,
|
|
Info.ftLastAccessTime.dwHighDateTime,
|
|
Info.ftLastAccessTime.dwLowDateTime,
|
|
Info.ftLastWriteTime.dwHighDateTime, Info.ftLastWriteTime.dwLowDateTime,
|
|
Info.dwVolumeSerialNumber, Info.nFileSizeHigh, Info.nFileSizeLow,
|
|
Info.nFileIndexHigh, Info.nFileIndexLow);
|
|
return std::error_code();
|
|
}
|
|
|
|
handle_status_error:
|
|
DWORD LastError = ::GetLastError();
|
|
if (LastError == ERROR_FILE_NOT_FOUND ||
|
|
LastError == ERROR_PATH_NOT_FOUND)
|
|
Result = file_status(file_type::file_not_found);
|
|
else if (LastError == ERROR_SHARING_VIOLATION)
|
|
Result = file_status(file_type::type_unknown);
|
|
else
|
|
Result = file_status(file_type::status_error);
|
|
return mapWindowsError(LastError);
|
|
}
|
|
|
|
std::error_code status(const Twine &path, file_status &result, bool Follow) {
|
|
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 std::error_code();
|
|
}
|
|
|
|
if (std::error_code ec = widenPath(path8, path_utf16))
|
|
return ec;
|
|
|
|
DWORD attr = ::GetFileAttributesW(path_utf16.begin());
|
|
if (attr == INVALID_FILE_ATTRIBUTES)
|
|
return getStatus(INVALID_HANDLE_VALUE, result);
|
|
|
|
DWORD Flags = FILE_FLAG_BACKUP_SEMANTICS;
|
|
// Handle reparse points.
|
|
if (!Follow && (attr & FILE_ATTRIBUTE_REPARSE_POINT))
|
|
Flags |= FILE_FLAG_OPEN_REPARSE_POINT;
|
|
|
|
ScopedFileHandle h(
|
|
::CreateFileW(path_utf16.begin(), 0, // Attributes only.
|
|
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
|
|
NULL, OPEN_EXISTING, Flags, 0));
|
|
if (!h)
|
|
return getStatus(INVALID_HANDLE_VALUE, result);
|
|
|
|
return getStatus(h, result);
|
|
}
|
|
|
|
std::error_code status(int FD, file_status &Result) {
|
|
HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
|
|
return getStatus(FileHandle, Result);
|
|
}
|
|
|
|
std::error_code setPermissions(const Twine &Path, perms Permissions) {
|
|
SmallVector<wchar_t, 128> PathUTF16;
|
|
if (std::error_code EC = widenPath(Path, PathUTF16))
|
|
return EC;
|
|
|
|
DWORD Attributes = ::GetFileAttributesW(PathUTF16.begin());
|
|
if (Attributes == INVALID_FILE_ATTRIBUTES)
|
|
return mapWindowsError(GetLastError());
|
|
|
|
// There are many Windows file attributes that are not to do with the file
|
|
// permissions (e.g. FILE_ATTRIBUTE_HIDDEN). We need to be careful to preserve
|
|
// them.
|
|
if (Permissions & all_write) {
|
|
Attributes &= ~FILE_ATTRIBUTE_READONLY;
|
|
if (Attributes == 0)
|
|
// FILE_ATTRIBUTE_NORMAL indicates no other attributes are set.
|
|
Attributes |= FILE_ATTRIBUTE_NORMAL;
|
|
}
|
|
else {
|
|
Attributes |= FILE_ATTRIBUTE_READONLY;
|
|
// FILE_ATTRIBUTE_NORMAL is not compatible with any other attributes, so
|
|
// remove it, if it is present.
|
|
Attributes &= ~FILE_ATTRIBUTE_NORMAL;
|
|
}
|
|
|
|
if (!::SetFileAttributesW(PathUTF16.begin(), Attributes))
|
|
return mapWindowsError(GetLastError());
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) {
|
|
FILETIME FT = toFILETIME(Time);
|
|
HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
|
|
if (!SetFileTime(FileHandle, NULL, &FT, &FT))
|
|
return mapWindowsError(::GetLastError());
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code mapped_file_region::init(int FD, uint64_t Offset,
|
|
mapmode Mode) {
|
|
// Make sure that the requested size fits within SIZE_T.
|
|
if (Size > std::numeric_limits<SIZE_T>::max())
|
|
return make_error_code(errc::invalid_argument);
|
|
|
|
HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
|
|
if (FileHandle == INVALID_HANDLE_VALUE)
|
|
return make_error_code(errc::bad_file_descriptor);
|
|
|
|
DWORD flprotect;
|
|
switch (Mode) {
|
|
case readonly: flprotect = PAGE_READONLY; break;
|
|
case readwrite: flprotect = PAGE_READWRITE; break;
|
|
case priv: flprotect = PAGE_WRITECOPY; break;
|
|
}
|
|
|
|
HANDLE FileMappingHandle =
|
|
::CreateFileMappingW(FileHandle, 0, flprotect,
|
|
(Offset + Size) >> 32,
|
|
(Offset + Size) & 0xffffffff,
|
|
0);
|
|
if (FileMappingHandle == NULL) {
|
|
std::error_code ec = mapWindowsError(GetLastError());
|
|
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) {
|
|
std::error_code ec = mapWindowsError(GetLastError());
|
|
::CloseHandle(FileMappingHandle);
|
|
return ec;
|
|
}
|
|
|
|
if (Size == 0) {
|
|
MEMORY_BASIC_INFORMATION mbi;
|
|
SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
|
|
if (Result == 0) {
|
|
std::error_code ec = mapWindowsError(GetLastError());
|
|
::UnmapViewOfFile(Mapping);
|
|
::CloseHandle(FileMappingHandle);
|
|
return ec;
|
|
}
|
|
Size = mbi.RegionSize;
|
|
}
|
|
|
|
// Close all the handles except for the view. It will keep the other handles
|
|
// alive.
|
|
::CloseHandle(FileMappingHandle);
|
|
return std::error_code();
|
|
}
|
|
|
|
mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
|
|
uint64_t offset, std::error_code &ec)
|
|
: Size(length), Mapping() {
|
|
ec = init(fd, offset, mode);
|
|
if (ec)
|
|
Mapping = 0;
|
|
}
|
|
|
|
mapped_file_region::~mapped_file_region() {
|
|
if (Mapping)
|
|
::UnmapViewOfFile(Mapping);
|
|
}
|
|
|
|
uint64_t mapped_file_region::size() const {
|
|
assert(Mapping && "Mapping failed but used anyway!");
|
|
return Size;
|
|
}
|
|
|
|
char *mapped_file_region::data() const {
|
|
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;
|
|
}
|
|
|
|
std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
|
|
StringRef path,
|
|
bool follow_symlinks) {
|
|
SmallVector<wchar_t, 128> path_utf16;
|
|
|
|
if (std::error_code ec = widenPath(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 mapWindowsError(::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)) {
|
|
DWORD LastError = ::GetLastError();
|
|
// Check for end.
|
|
if (LastError == ERROR_NO_MORE_FILES)
|
|
return detail::directory_iterator_destruct(it);
|
|
return mapWindowsError(LastError);
|
|
} else
|
|
FilenameLen = ::wcslen(FirstFind.cFileName);
|
|
|
|
// Construct the current directory entry.
|
|
SmallString<128> directory_entry_name_utf8;
|
|
if (std::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);
|
|
it.CurrentEntry = directory_entry(directory_entry_path, follow_symlinks);
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
std::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 std::error_code();
|
|
}
|
|
|
|
std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
|
|
WIN32_FIND_DATAW FindData;
|
|
if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
|
|
DWORD LastError = ::GetLastError();
|
|
// Check for end.
|
|
if (LastError == ERROR_NO_MORE_FILES)
|
|
return detail::directory_iterator_destruct(it);
|
|
return mapWindowsError(LastError);
|
|
}
|
|
|
|
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 (std::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 std::error_code();
|
|
}
|
|
|
|
static std::error_code realPathFromHandle(HANDLE H,
|
|
SmallVectorImpl<char> &RealPath) {
|
|
RealPath.clear();
|
|
llvm::SmallVector<wchar_t, MAX_PATH> Buffer;
|
|
DWORD CountChars = ::GetFinalPathNameByHandleW(
|
|
H, Buffer.begin(), Buffer.capacity() - 1, FILE_NAME_NORMALIZED);
|
|
if (CountChars > Buffer.capacity()) {
|
|
// The buffer wasn't big enough, try again. In this case the return value
|
|
// *does* indicate the size of the null terminator.
|
|
Buffer.reserve(CountChars);
|
|
CountChars = ::GetFinalPathNameByHandleW(
|
|
H, Buffer.data(), Buffer.capacity() - 1, FILE_NAME_NORMALIZED);
|
|
}
|
|
if (CountChars == 0)
|
|
return mapWindowsError(GetLastError());
|
|
|
|
const wchar_t *Data = Buffer.data();
|
|
if (CountChars >= 4) {
|
|
if (0 == ::memcmp(Data, L"\\\\?\\", 8)) {
|
|
CountChars -= 4;
|
|
Data += 4;
|
|
}
|
|
}
|
|
|
|
// Convert the result from UTF-16 to UTF-8.
|
|
return UTF16ToUTF8(Data, CountChars, RealPath);
|
|
}
|
|
|
|
static std::error_code directoryRealPath(const Twine &Name,
|
|
SmallVectorImpl<char> &RealPath) {
|
|
SmallVector<wchar_t, 128> PathUTF16;
|
|
|
|
if (std::error_code EC = widenPath(Name, PathUTF16))
|
|
return EC;
|
|
|
|
HANDLE H =
|
|
::CreateFileW(PathUTF16.begin(), GENERIC_READ,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
|
|
NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
|
|
if (H == INVALID_HANDLE_VALUE)
|
|
return mapWindowsError(GetLastError());
|
|
std::error_code EC = realPathFromHandle(H, RealPath);
|
|
::CloseHandle(H);
|
|
return EC;
|
|
}
|
|
|
|
std::error_code openFileForRead(const Twine &Name, int &ResultFD,
|
|
SmallVectorImpl<char> *RealPath) {
|
|
SmallVector<wchar_t, 128> PathUTF16;
|
|
|
|
if (std::error_code EC = widenPath(Name, PathUTF16))
|
|
return EC;
|
|
|
|
HANDLE H =
|
|
::CreateFileW(PathUTF16.begin(), GENERIC_READ,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
|
|
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
|
|
if (H == INVALID_HANDLE_VALUE) {
|
|
DWORD LastError = ::GetLastError();
|
|
std::error_code EC = mapWindowsError(LastError);
|
|
// 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 (LastError != ERROR_ACCESS_DENIED)
|
|
return EC;
|
|
if (is_directory(Name))
|
|
return make_error_code(errc::is_a_directory);
|
|
return EC;
|
|
}
|
|
|
|
int FD = ::_open_osfhandle(intptr_t(H), 0);
|
|
if (FD == -1) {
|
|
::CloseHandle(H);
|
|
return mapWindowsError(ERROR_INVALID_HANDLE);
|
|
}
|
|
|
|
// Fetch the real name of the file, if the user asked
|
|
if (RealPath)
|
|
realPathFromHandle(H, *RealPath);
|
|
|
|
ResultFD = FD;
|
|
return std::error_code();
|
|
}
|
|
|
|
std::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!");
|
|
|
|
SmallVector<wchar_t, 128> PathUTF16;
|
|
|
|
if (std::error_code EC = widenPath(Name, PathUTF16))
|
|
return EC;
|
|
|
|
DWORD CreationDisposition;
|
|
if (Flags & F_Excl)
|
|
CreationDisposition = CREATE_NEW;
|
|
else if (Flags & F_Append)
|
|
CreationDisposition = OPEN_ALWAYS;
|
|
else
|
|
CreationDisposition = CREATE_ALWAYS;
|
|
|
|
DWORD Access = GENERIC_WRITE;
|
|
if (Flags & F_RW)
|
|
Access |= GENERIC_READ;
|
|
|
|
HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
|
|
CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
|
|
|
|
if (H == INVALID_HANDLE_VALUE) {
|
|
DWORD LastError = ::GetLastError();
|
|
std::error_code EC = mapWindowsError(LastError);
|
|
// 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 (LastError != ERROR_ACCESS_DENIED)
|
|
return EC;
|
|
if (is_directory(Name))
|
|
return make_error_code(errc::is_a_directory);
|
|
return EC;
|
|
}
|
|
|
|
int OpenFlags = 0;
|
|
if (Flags & F_Append)
|
|
OpenFlags |= _O_APPEND;
|
|
|
|
if (Flags & F_Text)
|
|
OpenFlags |= _O_TEXT;
|
|
|
|
int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
|
|
if (FD == -1) {
|
|
::CloseHandle(H);
|
|
return mapWindowsError(ERROR_INVALID_HANDLE);
|
|
}
|
|
|
|
ResultFD = FD;
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) {
|
|
HANDLE FileHandle = reinterpret_cast<HANDLE>(::_get_osfhandle(FD));
|
|
if (FileHandle == INVALID_HANDLE_VALUE)
|
|
return make_error_code(errc::bad_file_descriptor);
|
|
|
|
DWORD CharCount;
|
|
SmallVector<wchar_t, 1024> TempPath;
|
|
do {
|
|
CharCount = ::GetFinalPathNameByHandleW(FileHandle, TempPath.begin(),
|
|
TempPath.capacity(),
|
|
FILE_NAME_NORMALIZED);
|
|
if (CharCount < TempPath.capacity())
|
|
break;
|
|
|
|
// Reserve sufficient space for the path as well as the null character. Even
|
|
// though the API does not document that it is required, if we reserve just
|
|
// CharCount space, the function call will not store the resulting path and
|
|
// still report success.
|
|
TempPath.reserve(CharCount + 1);
|
|
} while (true);
|
|
|
|
if (CharCount == 0)
|
|
return mapWindowsError(::GetLastError());
|
|
|
|
TempPath.set_size(CharCount);
|
|
|
|
// On earlier Windows releases, the character count includes the terminating
|
|
// null.
|
|
if (TempPath.back() == L'\0') {
|
|
--CharCount;
|
|
TempPath.pop_back();
|
|
}
|
|
|
|
return windows::UTF16ToUTF8(TempPath.data(), CharCount, ResultPath);
|
|
}
|
|
|
|
std::error_code remove_directories(const Twine &path, bool IgnoreErrors) {
|
|
// Convert to utf-16.
|
|
SmallVector<wchar_t, 128> Path16;
|
|
std::error_code EC = widenPath(path, Path16);
|
|
if (EC && !IgnoreErrors)
|
|
return EC;
|
|
|
|
// SHFileOperation() accepts a list of paths, and so must be double null-
|
|
// terminated to indicate the end of the list. The buffer is already null
|
|
// terminated, but since that null character is not considered part of the
|
|
// vector's size, pushing another one will just consume that byte. So we
|
|
// need to push 2 null terminators.
|
|
Path16.push_back(0);
|
|
Path16.push_back(0);
|
|
|
|
SHFILEOPSTRUCTW shfos = {};
|
|
shfos.wFunc = FO_DELETE;
|
|
shfos.pFrom = Path16.data();
|
|
shfos.fFlags = FOF_NO_UI;
|
|
|
|
int result = ::SHFileOperationW(&shfos);
|
|
if (result != 0 && !IgnoreErrors)
|
|
return mapWindowsError(result);
|
|
return std::error_code();
|
|
}
|
|
|
|
static void expandTildeExpr(SmallVectorImpl<char> &Path) {
|
|
// Path does not begin with a tilde expression.
|
|
if (Path.empty() || Path[0] != '~')
|
|
return;
|
|
|
|
StringRef PathStr(Path.begin(), Path.size());
|
|
PathStr = PathStr.drop_front();
|
|
StringRef Expr = PathStr.take_until([](char c) { return path::is_separator(c); });
|
|
|
|
if (!Expr.empty()) {
|
|
// This is probably a ~username/ expression. Don't support this on Windows.
|
|
return;
|
|
}
|
|
|
|
SmallString<128> HomeDir;
|
|
if (!path::home_directory(HomeDir)) {
|
|
// For some reason we couldn't get the home directory. Just exit.
|
|
return;
|
|
}
|
|
|
|
// Overwrite the first character and insert the rest.
|
|
Path[0] = HomeDir[0];
|
|
Path.insert(Path.begin() + 1, HomeDir.begin() + 1, HomeDir.end());
|
|
}
|
|
|
|
std::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest,
|
|
bool expand_tilde) {
|
|
dest.clear();
|
|
if (path.isTriviallyEmpty())
|
|
return std::error_code();
|
|
|
|
if (expand_tilde) {
|
|
SmallString<128> Storage;
|
|
path.toVector(Storage);
|
|
expandTildeExpr(Storage);
|
|
return real_path(Storage, dest, false);
|
|
}
|
|
|
|
if (is_directory(path))
|
|
return directoryRealPath(path, dest);
|
|
|
|
int fd;
|
|
if (std::error_code EC = llvm::sys::fs::openFileForRead(path, fd, &dest))
|
|
return EC;
|
|
::close(fd);
|
|
return std::error_code();
|
|
}
|
|
|
|
} // end namespace fs
|
|
|
|
namespace path {
|
|
static bool getKnownFolderPath(KNOWNFOLDERID folderId,
|
|
SmallVectorImpl<char> &result) {
|
|
wchar_t *path = nullptr;
|
|
if (::SHGetKnownFolderPath(folderId, KF_FLAG_CREATE, nullptr, &path) != S_OK)
|
|
return false;
|
|
|
|
bool ok = !UTF16ToUTF8(path, ::wcslen(path), result);
|
|
::CoTaskMemFree(path);
|
|
return ok;
|
|
}
|
|
|
|
bool getUserCacheDir(SmallVectorImpl<char> &Result) {
|
|
return getKnownFolderPath(FOLDERID_LocalAppData, Result);
|
|
}
|
|
|
|
bool home_directory(SmallVectorImpl<char> &result) {
|
|
return getKnownFolderPath(FOLDERID_Profile, result);
|
|
}
|
|
|
|
static bool getTempDirEnvVar(const wchar_t *Var, SmallVectorImpl<char> &Res) {
|
|
SmallVector<wchar_t, 1024> Buf;
|
|
size_t Size = 1024;
|
|
do {
|
|
Buf.reserve(Size);
|
|
Size = GetEnvironmentVariableW(Var, Buf.data(), Buf.capacity());
|
|
if (Size == 0)
|
|
return false;
|
|
|
|
// Try again with larger buffer.
|
|
} while (Size > Buf.capacity());
|
|
Buf.set_size(Size);
|
|
|
|
return !windows::UTF16ToUTF8(Buf.data(), Size, Res);
|
|
}
|
|
|
|
static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
|
|
const wchar_t *EnvironmentVariables[] = {L"TMP", L"TEMP", L"USERPROFILE"};
|
|
for (auto *Env : EnvironmentVariables) {
|
|
if (getTempDirEnvVar(Env, Res))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
|
|
(void)ErasedOnReboot;
|
|
Result.clear();
|
|
|
|
// Check whether the temporary directory is specified by an environment var.
|
|
// This matches GetTempPath logic to some degree. GetTempPath is not used
|
|
// directly as it cannot handle evn var longer than 130 chars on Windows 7
|
|
// (fixed on Windows 8).
|
|
if (getTempDirEnvVar(Result)) {
|
|
assert(!Result.empty() && "Unexpected empty path");
|
|
native(Result); // Some Unix-like shells use Unix path separator in $TMP.
|
|
fs::make_absolute(Result); // Make it absolute if not already.
|
|
return;
|
|
}
|
|
|
|
// Fall back to a system default.
|
|
const char *DefaultResult = "C:\\Temp";
|
|
Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
|
|
}
|
|
} // end namespace path
|
|
|
|
namespace windows {
|
|
std::error_code UTF8ToUTF16(llvm::StringRef utf8,
|
|
llvm::SmallVectorImpl<wchar_t> &utf16) {
|
|
if (!utf8.empty()) {
|
|
int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
|
|
utf8.size(), utf16.begin(), 0);
|
|
|
|
if (len == 0)
|
|
return mapWindowsError(::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 mapWindowsError(::GetLastError());
|
|
}
|
|
|
|
// Make utf16 null terminated.
|
|
utf16.push_back(0);
|
|
utf16.pop_back();
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
static
|
|
std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
|
|
size_t utf16_len,
|
|
llvm::SmallVectorImpl<char> &utf8) {
|
|
if (utf16_len) {
|
|
// Get length.
|
|
int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
|
|
0, NULL, NULL);
|
|
|
|
if (len == 0)
|
|
return mapWindowsError(::GetLastError());
|
|
|
|
utf8.reserve(len);
|
|
utf8.set_size(len);
|
|
|
|
// Now do the actual conversion.
|
|
len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
|
|
utf8.size(), NULL, NULL);
|
|
|
|
if (len == 0)
|
|
return mapWindowsError(::GetLastError());
|
|
}
|
|
|
|
// Make utf8 null terminated.
|
|
utf8.push_back(0);
|
|
utf8.pop_back();
|
|
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
|
|
llvm::SmallVectorImpl<char> &utf8) {
|
|
return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
|
|
}
|
|
|
|
std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
|
|
llvm::SmallVectorImpl<char> &utf8) {
|
|
return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
|
|
}
|
|
|
|
} // end namespace windows
|
|
} // end namespace sys
|
|
} // end namespace llvm
|