summaryrefslogtreecommitdiffstats
path: root/contrib/llvm/lib/Support/Unix/Path.inc
diff options
context:
space:
mode:
Diffstat (limited to 'contrib/llvm/lib/Support/Unix/Path.inc')
-rw-r--r--contrib/llvm/lib/Support/Unix/Path.inc684
1 files changed, 684 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Support/Unix/Path.inc b/contrib/llvm/lib/Support/Unix/Path.inc
new file mode 100644
index 0000000..623547a
--- /dev/null
+++ b/contrib/llvm/lib/Support/Unix/Path.inc
@@ -0,0 +1,684 @@
+//===- llvm/Support/Unix/Path.inc - Unix Path Implementation ----*- 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 Unix specific implementation of the Path API.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#include <limits.h>
+#include <stdio.h>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+#if HAVE_DIRENT_H
+# include <dirent.h>
+# define NAMLEN(dirent) strlen((dirent)->d_name)
+#else
+# define dirent direct
+# define NAMLEN(dirent) (dirent)->d_namlen
+# if HAVE_SYS_NDIR_H
+# include <sys/ndir.h>
+# endif
+# if HAVE_SYS_DIR_H
+# include <sys/dir.h>
+# endif
+# if HAVE_NDIR_H
+# include <ndir.h>
+# endif
+#endif
+
+#ifdef __APPLE__
+#include <mach-o/dyld.h>
+#endif
+
+// Both stdio.h and cstdio are included via different pathes and
+// stdcxx's cstdio doesn't include stdio.h, so it doesn't #undef the macros
+// either.
+#undef ferror
+#undef feof
+
+// For GNU Hurd
+#if defined(__GNU__) && !defined(PATH_MAX)
+# define PATH_MAX 4096
+#endif
+
+using namespace llvm;
+
+namespace {
+ /// This class automatically closes the given file descriptor when it goes out
+ /// of scope. You can take back explicit ownership of the file descriptor by
+ /// calling take(). The destructor does not verify that close was successful.
+ /// Therefore, never allow this class to call close on a file descriptor that
+ /// has been read from or written to.
+ struct AutoFD {
+ int FileDescriptor;
+
+ AutoFD(int fd) : FileDescriptor(fd) {}
+ ~AutoFD() {
+ if (FileDescriptor >= 0)
+ ::close(FileDescriptor);
+ }
+
+ int take() {
+ int ret = FileDescriptor;
+ FileDescriptor = -1;
+ return ret;
+ }
+
+ operator int() const {return FileDescriptor;}
+ };
+}
+
+static std::error_code TempDir(SmallVectorImpl<char> &result) {
+ // FIXME: Don't use TMPDIR if program is SUID or SGID enabled.
+ const char *dir = nullptr;
+ (dir = std::getenv("TMPDIR")) || (dir = std::getenv("TMP")) ||
+ (dir = std::getenv("TEMP")) || (dir = std::getenv("TEMPDIR")) ||
+#ifdef P_tmpdir
+ (dir = P_tmpdir) ||
+#endif
+ (dir = "/tmp");
+
+ result.clear();
+ StringRef d(dir);
+ result.append(d.begin(), d.end());
+ return std::error_code();
+}
+
+namespace llvm {
+namespace sys {
+namespace fs {
+#if defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
+ defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
+ defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__)
+static int
+test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
+{
+ struct stat sb;
+ char fullpath[PATH_MAX];
+
+ snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
+ if (realpath(fullpath, ret) == NULL)
+ return (1);
+ if (stat(fullpath, &sb) != 0)
+ return (1);
+
+ return (0);
+}
+
+static char *
+getprogpath(char ret[PATH_MAX], const char *bin)
+{
+ char *pv, *s, *t;
+
+ /* First approach: absolute path. */
+ if (bin[0] == '/') {
+ if (test_dir(ret, "/", bin) == 0)
+ return (ret);
+ return (NULL);
+ }
+
+ /* Second approach: relative path. */
+ if (strchr(bin, '/') != NULL) {
+ char cwd[PATH_MAX];
+ if (getcwd(cwd, PATH_MAX) == NULL)
+ return (NULL);
+ if (test_dir(ret, cwd, bin) == 0)
+ return (ret);
+ return (NULL);
+ }
+
+ /* Third approach: $PATH */
+ if ((pv = getenv("PATH")) == NULL)
+ return (NULL);
+ s = pv = strdup(pv);
+ if (pv == NULL)
+ return (NULL);
+ while ((t = strsep(&s, ":")) != NULL) {
+ if (test_dir(ret, t, bin) == 0) {
+ free(pv);
+ return (ret);
+ }
+ }
+ free(pv);
+ return (NULL);
+}
+#endif // __FreeBSD__ || __NetBSD__ || __FreeBSD_kernel__
+
+/// GetMainExecutable - Return the path to the main executable, given the
+/// value of argv[0] from program startup.
+std::string getMainExecutable(const char *argv0, void *MainAddr) {
+#if defined(__APPLE__)
+ // On OS X the executable path is saved to the stack by dyld. Reading it
+ // from there is much faster than calling dladdr, especially for large
+ // binaries with symbols.
+ char exe_path[MAXPATHLEN];
+ uint32_t size = sizeof(exe_path);
+ if (_NSGetExecutablePath(exe_path, &size) == 0) {
+ char link_path[MAXPATHLEN];
+ if (realpath(exe_path, link_path))
+ return link_path;
+ }
+#elif defined(__FreeBSD__) || defined (__NetBSD__) || defined(__Bitrig__) || \
+ defined(__OpenBSD__) || defined(__minix) || defined(__DragonFly__) || \
+ defined(__FreeBSD_kernel__)
+ char exe_path[PATH_MAX];
+
+ if (getprogpath(exe_path, argv0) != NULL)
+ return exe_path;
+#elif defined(__linux__) || defined(__CYGWIN__)
+ char exe_path[MAXPATHLEN];
+ StringRef aPath("/proc/self/exe");
+ if (sys::fs::exists(aPath)) {
+ // /proc is not always mounted under Linux (chroot for example).
+ ssize_t len = readlink(aPath.str().c_str(), exe_path, sizeof(exe_path));
+ if (len >= 0)
+ return StringRef(exe_path, len);
+ } else {
+ // Fall back to the classical detection.
+ if (getprogpath(exe_path, argv0) != NULL)
+ return exe_path;
+ }
+#elif defined(HAVE_DLFCN_H)
+ // Use dladdr to get executable path if available.
+ Dl_info DLInfo;
+ int err = dladdr(MainAddr, &DLInfo);
+ if (err == 0)
+ return "";
+
+ // If the filename is a symlink, we need to resolve and return the location of
+ // the actual executable.
+ char link_path[MAXPATHLEN];
+ if (realpath(DLInfo.dli_fname, link_path))
+ return link_path;
+#else
+#error GetMainExecutable is not implemented on this host yet.
+#endif
+ return "";
+}
+
+TimeValue file_status::getLastModificationTime() const {
+ TimeValue Ret;
+ Ret.fromEpochTime(fs_st_mtime);
+ return Ret;
+}
+
+UniqueID file_status::getUniqueID() const {
+ return UniqueID(fs_st_dev, fs_st_ino);
+}
+
+std::error_code current_path(SmallVectorImpl<char> &result) {
+ result.clear();
+
+ const char *pwd = ::getenv("PWD");
+ llvm::sys::fs::file_status PWDStatus, DotStatus;
+ if (pwd && llvm::sys::path::is_absolute(pwd) &&
+ !llvm::sys::fs::status(pwd, PWDStatus) &&
+ !llvm::sys::fs::status(".", DotStatus) &&
+ PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
+ result.append(pwd, pwd + strlen(pwd));
+ return std::error_code();
+ }
+
+#ifdef MAXPATHLEN
+ result.reserve(MAXPATHLEN);
+#else
+// For GNU Hurd
+ result.reserve(1024);
+#endif
+
+ while (true) {
+ if (::getcwd(result.data(), result.capacity()) == nullptr) {
+ // See if there was a real error.
+ if (errno != ENOMEM)
+ return std::error_code(errno, std::generic_category());
+ // Otherwise there just wasn't enough space.
+ result.reserve(result.capacity() * 2);
+ } else
+ break;
+ }
+
+ result.set_size(strlen(result.data()));
+ return std::error_code();
+}
+
+std::error_code create_directory(const Twine &path, bool IgnoreExisting) {
+ SmallString<128> path_storage;
+ StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+ if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
+ if (errno != EEXIST || !IgnoreExisting)
+ return std::error_code(errno, std::generic_category());
+ }
+
+ return std::error_code();
+}
+
+std::error_code normalize_separators(SmallVectorImpl<char> &Path) {
+ for (auto PI = Path.begin(), PE = Path.end(); PI < PE; ++PI) {
+ if (*PI == '\\') {
+ auto PN = PI + 1;
+ if (PN < PE && *PN == '\\')
+ ++PI; // increment once, the for loop will move over the escaped slash
+ else
+ *PI = '/';
+ }
+ }
+ return std::error_code();
+}
+
+// Note that we are using symbolic link because hard links are not supported by
+// all filesystems (SMB doesn't).
+std::error_code create_link(const Twine &to, const Twine &from) {
+ // Get arguments.
+ SmallString<128> from_storage;
+ SmallString<128> to_storage;
+ StringRef f = from.toNullTerminatedStringRef(from_storage);
+ StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+ if (::symlink(t.begin(), f.begin()) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
+ SmallString<128> path_storage;
+ StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+ struct stat buf;
+ if (lstat(p.begin(), &buf) != 0) {
+ if (errno != ENOENT || !IgnoreNonExisting)
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+ }
+
+ // Note: this check catches strange situations. In all cases, LLVM should
+ // only be involved in the creation and deletion of regular files. This
+ // check ensures that what we're trying to erase is a regular file. It
+ // effectively prevents LLVM from erasing things like /dev/null, any block
+ // special file, or other things that aren't "regular" files.
+ if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
+ return make_error_code(errc::operation_not_permitted);
+
+ if (::remove(p.begin()) == -1) {
+ if (errno != ENOENT || !IgnoreNonExisting)
+ return std::error_code(errno, std::generic_category());
+ }
+
+ return std::error_code();
+}
+
+std::error_code rename(const Twine &from, const Twine &to) {
+ // Get arguments.
+ SmallString<128> from_storage;
+ SmallString<128> to_storage;
+ StringRef f = from.toNullTerminatedStringRef(from_storage);
+ StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+ if (::rename(f.begin(), t.begin()) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+std::error_code resize_file(const Twine &path, uint64_t size) {
+ SmallString<128> path_storage;
+ StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+ if (::truncate(p.begin(), size) == -1)
+ return std::error_code(errno, std::generic_category());
+
+ return std::error_code();
+}
+
+std::error_code exists(const Twine &path, bool &result) {
+ SmallString<128> path_storage;
+ StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+ if (::access(p.begin(), F_OK) == -1) {
+ if (errno != ENOENT)
+ return std::error_code(errno, std::generic_category());
+ result = false;
+ } else
+ result = true;
+
+ return std::error_code();
+}
+
+bool can_write(const Twine &Path) {
+ SmallString<128> PathStorage;
+ StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+ return 0 == access(P.begin(), W_OK);
+}
+
+bool can_execute(const Twine &Path) {
+ SmallString<128> PathStorage;
+ StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+ if (0 != access(P.begin(), R_OK | X_OK))
+ return false;
+ struct stat buf;
+ if (0 != stat(P.begin(), &buf))
+ return false;
+ if (!S_ISREG(buf.st_mode))
+ return false;
+ return true;
+}
+
+bool equivalent(file_status A, file_status B) {
+ assert(status_known(A) && status_known(B));
+ return A.fs_st_dev == B.fs_st_dev &&
+ A.fs_st_ino == B.fs_st_ino;
+}
+
+std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
+ file_status fsA, fsB;
+ if (std::error_code ec = status(A, fsA))
+ return ec;
+ if (std::error_code ec = status(B, fsB))
+ return ec;
+ result = equivalent(fsA, fsB);
+ return std::error_code();
+}
+
+static std::error_code fillStatus(int StatRet, const struct stat &Status,
+ file_status &Result) {
+ if (StatRet != 0) {
+ std::error_code ec(errno, std::generic_category());
+ if (ec == errc::no_such_file_or_directory)
+ Result = file_status(file_type::file_not_found);
+ else
+ Result = file_status(file_type::status_error);
+ return ec;
+ }
+
+ file_type Type = file_type::type_unknown;
+
+ if (S_ISDIR(Status.st_mode))
+ Type = file_type::directory_file;
+ else if (S_ISREG(Status.st_mode))
+ Type = file_type::regular_file;
+ else if (S_ISBLK(Status.st_mode))
+ Type = file_type::block_file;
+ else if (S_ISCHR(Status.st_mode))
+ Type = file_type::character_file;
+ else if (S_ISFIFO(Status.st_mode))
+ Type = file_type::fifo_file;
+ else if (S_ISSOCK(Status.st_mode))
+ Type = file_type::socket_file;
+
+ perms Perms = static_cast<perms>(Status.st_mode);
+ Result =
+ file_status(Type, Perms, Status.st_dev, Status.st_ino, Status.st_mtime,
+ Status.st_uid, Status.st_gid, Status.st_size);
+
+ return std::error_code();
+}
+
+std::error_code status(const Twine &Path, file_status &Result) {
+ SmallString<128> PathStorage;
+ StringRef P = Path.toNullTerminatedStringRef(PathStorage);
+
+ struct stat Status;
+ int StatRet = ::stat(P.begin(), &Status);
+ return fillStatus(StatRet, Status, Result);
+}
+
+std::error_code status(int FD, file_status &Result) {
+ struct stat Status;
+ int StatRet = ::fstat(FD, &Status);
+ return fillStatus(StatRet, Status, Result);
+}
+
+std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
+#if defined(HAVE_FUTIMENS)
+ timespec Times[2];
+ Times[0].tv_sec = Time.toEpochTime();
+ Times[0].tv_nsec = 0;
+ Times[1] = Times[0];
+ if (::futimens(FD, Times))
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+#elif defined(HAVE_FUTIMES)
+ timeval Times[2];
+ Times[0].tv_sec = Time.toEpochTime();
+ Times[0].tv_usec = 0;
+ Times[1] = Times[0];
+ if (::futimes(FD, Times))
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+#else
+#warning Missing futimes() and futimens()
+ return make_error_code(errc::function_not_supported);
+#endif
+}
+
+std::error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) {
+ AutoFD ScopedFD(FD);
+ if (!CloseFD)
+ ScopedFD.take();
+
+ // Figure out how large the file is.
+ struct stat FileInfo;
+ if (fstat(FD, &FileInfo) == -1)
+ return std::error_code(errno, std::generic_category());
+ uint64_t FileSize = FileInfo.st_size;
+
+ if (Size == 0)
+ Size = FileSize;
+ else if (FileSize < Size) {
+ // We need to grow the file.
+ if (ftruncate(FD, Size) == -1)
+ return std::error_code(errno, std::generic_category());
+ }
+
+ int flags = (Mode == readwrite) ? MAP_SHARED : MAP_PRIVATE;
+ int prot = (Mode == readonly) ? PROT_READ : (PROT_READ | PROT_WRITE);
+#ifdef MAP_FILE
+ flags |= MAP_FILE;
+#endif
+ Mapping = ::mmap(nullptr, Size, prot, flags, FD, Offset);
+ if (Mapping == MAP_FAILED)
+ return std::error_code(errno, std::generic_category());
+ return std::error_code();
+}
+
+mapped_file_region::mapped_file_region(const Twine &path,
+ mapmode mode,
+ uint64_t length,
+ uint64_t offset,
+ std::error_code &ec)
+ : Mode(mode)
+ , Size(length)
+ , Mapping() {
+ // Make sure that the requested size fits within SIZE_T.
+ if (length > std::numeric_limits<size_t>::max()) {
+ ec = make_error_code(errc::invalid_argument);
+ return;
+ }
+
+ SmallString<128> path_storage;
+ StringRef name = path.toNullTerminatedStringRef(path_storage);
+ int oflags = (mode == readonly) ? O_RDONLY : O_RDWR;
+ int ofd = ::open(name.begin(), oflags);
+ if (ofd == -1) {
+ ec = std::error_code(errno, std::generic_category());
+ return;
+ }
+
+ ec = init(ofd, true, offset);
+ if (ec)
+ Mapping = nullptr;
+}
+
+mapped_file_region::mapped_file_region(int fd,
+ bool closefd,
+ mapmode mode,
+ uint64_t length,
+ uint64_t offset,
+ std::error_code &ec)
+ : Mode(mode)
+ , Size(length)
+ , Mapping() {
+ // Make sure that the requested size fits within SIZE_T.
+ if (length > std::numeric_limits<size_t>::max()) {
+ ec = make_error_code(errc::invalid_argument);
+ return;
+ }
+
+ ec = init(fd, closefd, offset);
+ if (ec)
+ Mapping = nullptr;
+}
+
+mapped_file_region::~mapped_file_region() {
+ if (Mapping)
+ ::munmap(Mapping, Size);
+}
+
+mapped_file_region::mapped_file_region(mapped_file_region &&other)
+ : Mode(other.Mode), Size(other.Size), Mapping(other.Mapping) {
+ other.Mapping = nullptr;
+}
+
+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(Mapping && "Mapping failed but used anyway!");
+ assert(Mode != readonly && "Cannot get non-const data for readonly mapping!");
+ 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() {
+ return process::get_self()->page_size();
+}
+
+std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
+ StringRef path){
+ SmallString<128> path_null(path);
+ DIR *directory = ::opendir(path_null.c_str());
+ if (!directory)
+ return std::error_code(errno, std::generic_category());
+
+ it.IterationHandle = reinterpret_cast<intptr_t>(directory);
+ // Add something for replace_filename to replace.
+ path::append(path_null, ".");
+ it.CurrentEntry = directory_entry(path_null.str());
+ return directory_iterator_increment(it);
+}
+
+std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
+ if (it.IterationHandle)
+ ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
+ it.IterationHandle = 0;
+ it.CurrentEntry = directory_entry();
+ return std::error_code();
+}
+
+std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
+ errno = 0;
+ dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
+ if (cur_dir == nullptr && errno != 0) {
+ return std::error_code(errno, std::generic_category());
+ } else if (cur_dir != nullptr) {
+ StringRef name(cur_dir->d_name, NAMLEN(cur_dir));
+ if ((name.size() == 1 && name[0] == '.') ||
+ (name.size() == 2 && name[0] == '.' && name[1] == '.'))
+ return directory_iterator_increment(it);
+ it.CurrentEntry.replace_filename(name);
+ } else
+ return directory_iterator_destruct(it);
+
+ return std::error_code();
+}
+
+std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
+ SmallString<128> Storage;
+ StringRef P = Name.toNullTerminatedStringRef(Storage);
+ while ((ResultFD = open(P.begin(), O_RDONLY)) < 0) {
+ if (errno != EINTR)
+ return std::error_code(errno, std::generic_category());
+ }
+ 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!");
+
+ int OpenFlags = O_CREAT;
+
+ if (Flags & F_RW)
+ OpenFlags |= O_RDWR;
+ else
+ OpenFlags |= O_WRONLY;
+
+ if (Flags & F_Append)
+ OpenFlags |= O_APPEND;
+ else
+ OpenFlags |= O_TRUNC;
+
+ if (Flags & F_Excl)
+ OpenFlags |= O_EXCL;
+
+ SmallString<128> Storage;
+ StringRef P = Name.toNullTerminatedStringRef(Storage);
+ while ((ResultFD = open(P.begin(), OpenFlags, Mode)) < 0) {
+ if (errno != EINTR)
+ return std::error_code(errno, std::generic_category());
+ }
+ return std::error_code();
+}
+
+} // end namespace fs
+
+namespace path {
+
+bool home_directory(SmallVectorImpl<char> &result) {
+ if (char *RequestedDir = getenv("HOME")) {
+ result.clear();
+ result.append(RequestedDir, RequestedDir + strlen(RequestedDir));
+ return true;
+ }
+
+ return false;
+}
+
+} // end namespace path
+
+} // end namespace sys
+} // end namespace llvm
OpenPOWER on IntegriCloud