Vendor import of llvm trunk r126079:

http://llvm.org/svn/llvm-project/llvm/trunk@126079

1 files changed, 507 insertions, 0 deletions

diff --git a/lib/Support/Unix/PathV2.inc b/lib/Support/Unix/PathV2.inc
new file mode 100644
index 0000000..03ff283
--- /dev/null
+++ b/lib/Support/Unix/PathV2.inc
@@ -0,0 +1,507 @@
+//===- llvm/Support/Unix/PathV2.cpp - 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 PathV2 API.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "Unix.h"
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_FCNTL_H
+#include <fcntl.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
+#if HAVE_STDIO_H
+#include <stdio.h>
+#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;}
+  };
+
+  error_code TempDir(SmallVectorImpl<char> &result) {
+    // FIXME: Don't use TMPDIR if program is SUID or SGID enabled.
+    const char *dir = 0;
+    (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 success;
+  }
+}
+
+namespace llvm {
+namespace sys  {
+namespace fs {
+
+error_code current_path(SmallVectorImpl<char> &result) {
+  result.reserve(MAXPATHLEN);
+
+  while (true) {
+    if (::getcwd(result.data(), result.capacity()) == 0) {
+      // See if there was a real error.
+      if (errno != errc::not_enough_memory)
+        return error_code(errno, system_category());
+      // Otherwise there just wasn't enough space.
+      result.reserve(result.capacity() * 2);
+    } else
+      break;
+  }
+
+  result.set_size(strlen(result.data()));
+  return success;
+}
+
+error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
+ // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toNullTerminatedStringRef(from_storage);
+  StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+  const size_t buf_sz = 32768;
+  char buffer[buf_sz];
+  int from_file = -1, to_file = -1;
+
+  // Open from.
+  if ((from_file = ::open(f.begin(), O_RDONLY)) < 0)
+    return error_code(errno, system_category());
+  AutoFD from_fd(from_file);
+
+  // Stat from.
+  struct stat from_stat;
+  if (::stat(f.begin(), &from_stat) != 0)
+    return error_code(errno, system_category());
+
+  // Setup to flags.
+  int to_flags = O_CREAT | O_WRONLY;
+  if (copt == copy_option::fail_if_exists)
+    to_flags |= O_EXCL;
+
+  // Open to.
+  if ((to_file = ::open(t.begin(), to_flags, from_stat.st_mode)) < 0)
+    return error_code(errno, system_category());
+  AutoFD to_fd(to_file);
+
+  // Copy!
+  ssize_t sz, sz_read = 1, sz_write;
+  while (sz_read > 0 &&
+         (sz_read = ::read(from_fd, buffer, buf_sz)) > 0) {
+    // Allow for partial writes - see Advanced Unix Programming (2nd Ed.),
+    // Marc Rochkind, Addison-Wesley, 2004, page 94
+    sz_write = 0;
+    do {
+      if ((sz = ::write(to_fd, buffer + sz_write, sz_read - sz_write)) < 0) {
+        sz_read = sz;  // cause read loop termination.
+        break;         // error.
+      }
+      sz_write += sz;
+    } while (sz_write < sz_read);
+  }
+
+  // After all the file operations above the return value of close actually
+  // matters.
+  if (::close(from_fd.take()) < 0) sz_read = -1;
+  if (::close(to_fd.take()) < 0) sz_read = -1;
+
+  // Check for errors.
+  if (sz_read < 0)
+    return error_code(errno, system_category());
+
+  return success;
+}
+
+error_code create_directory(const Twine &path, bool &existed) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  if (::mkdir(p.begin(), S_IRWXU | S_IRWXG) == -1) {
+    if (errno != errc::file_exists)
+      return error_code(errno, system_category());
+    existed = true;
+  } else
+    existed = false;
+
+  return success;
+}
+
+error_code create_hard_link(const Twine &to, const Twine &from) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toNullTerminatedStringRef(from_storage);
+  StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+  if (::link(t.begin(), f.begin()) == -1)
+    return error_code(errno, system_category());
+
+  return success;
+}
+
+error_code create_symlink(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 error_code(errno, system_category());
+
+  return success;
+}
+
+error_code remove(const Twine &path, bool &existed) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  if (::remove(p.begin()) == -1) {
+    if (errno != errc::no_such_file_or_directory)
+      return error_code(errno, system_category());
+    existed = false;
+  } else
+    existed = true;
+
+  return success;
+}
+
+error_code rename(const Twine &from, const Twine &to) {
+  // Get arguments.
+  SmallString<128> from_storage;
+  SmallString<128> to_storage;
+  StringRef f = from.toNullTerminatedStringRef(from_storage);
+  StringRef t = to.toNullTerminatedStringRef(to_storage);
+
+  if (::rename(f.begin(), t.begin()) == -1) {
+    // If it's a cross device link, copy then delete, otherwise return the error
+    if (errno == EXDEV) {
+      if (error_code ec = copy_file(from, to, copy_option::overwrite_if_exists))
+        return ec;
+      bool Existed;
+      if (error_code ec = remove(from, Existed))
+        return ec;
+    } else
+      return error_code(errno, system_category());
+  }
+
+  return success;
+}
+
+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 error_code(errno, system_category());
+
+  return success;
+}
+
+error_code exists(const Twine &path, bool &result) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  struct stat status;
+  if (::stat(p.begin(), &status) == -1) {
+    if (errno != errc::no_such_file_or_directory)
+      return error_code(errno, system_category());
+    result = false;
+  } else
+    result = true;
+
+  return success;
+}
+
+error_code equivalent(const Twine &A, const Twine &B, bool &result) {
+  // Get arguments.
+  SmallString<128> a_storage;
+  SmallString<128> b_storage;
+  StringRef a = A.toNullTerminatedStringRef(a_storage);
+  StringRef b = B.toNullTerminatedStringRef(b_storage);
+
+  struct stat stat_a, stat_b;
+  int error_b = ::stat(b.begin(), &stat_b);
+  int error_a = ::stat(a.begin(), &stat_a);
+
+  // If both are invalid, it's an error. If only one is, the result is false.
+  if (error_a != 0 || error_b != 0) {
+    if (error_a == error_b)
+      return error_code(errno, system_category());
+    result = false;
+  } else {
+    result =
+      stat_a.st_dev == stat_b.st_dev &&
+      stat_a.st_ino == stat_b.st_ino;
+  }
+
+  return success;
+}
+
+error_code file_size(const Twine &path, uint64_t &result) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  struct stat status;
+  if (::stat(p.begin(), &status) == -1)
+    return error_code(errno, system_category());
+  if (!S_ISREG(status.st_mode))
+    return make_error_code(errc::operation_not_permitted);
+
+  result = status.st_size;
+  return success;
+}
+
+error_code status(const Twine &path, file_status &result) {
+  SmallString<128> path_storage;
+  StringRef p = path.toNullTerminatedStringRef(path_storage);
+
+  struct stat status;
+  if (::stat(p.begin(), &status) != 0) {
+    error_code ec(errno, system_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;
+  }
+
+  if (S_ISDIR(status.st_mode))
+    result = file_status(file_type::directory_file);
+  else if (S_ISREG(status.st_mode))
+    result = file_status(file_type::regular_file);
+  else if (S_ISBLK(status.st_mode))
+    result = file_status(file_type::block_file);
+  else if (S_ISCHR(status.st_mode))
+    result = file_status(file_type::character_file);
+  else if (S_ISFIFO(status.st_mode))
+    result = file_status(file_type::fifo_file);
+  else if (S_ISSOCK(status.st_mode))
+    result = file_status(file_type::socket_file);
+  else
+    result = file_status(file_type::type_unknown);
+
+  return success;
+}
+
+error_code unique_file(const Twine &model, int &result_fd,
+                             SmallVectorImpl<char> &result_path) {
+  SmallString<128> Model;
+  model.toVector(Model);
+  // Null terminate.
+  Model.c_str();
+
+  // Make model absolute by prepending a temp directory if it's not already.
+  bool absolute = path::is_absolute(Twine(Model));
+  if (!absolute) {
+    SmallString<128> TDir;
+    if (error_code ec = TempDir(TDir)) return ec;
+    path::append(TDir, Twine(Model));
+    Model.swap(TDir);
+  }
+
+  // Replace '%' with random chars. From here on, DO NOT modify model. It may be
+  // needed if the randomly chosen path already exists.
+  SmallString<128> RandomPath;
+  RandomPath.reserve(Model.size() + 1);
+  ::srand(::time(NULL));
+
+retry_random_path:
+  // This is opened here instead of above to make it easier to track when to
+  // close it. Collisions should be rare enough for the possible extra syscalls
+  // not to matter.
+  FILE *RandomSource = ::fopen("/dev/urandom", "r");
+  RandomPath.set_size(0);
+  for (SmallVectorImpl<char>::const_iterator i = Model.begin(),
+                                             e = Model.end(); i != e; ++i) {
+    if (*i == '%') {
+      char val = 0;
+      if (RandomSource)
+        val = fgetc(RandomSource);
+      else
+        val = ::rand();
+      RandomPath.push_back("0123456789abcdef"[val & 15]);
+    } else
+      RandomPath.push_back(*i);
+  }
+
+  if (RandomSource)
+    ::fclose(RandomSource);
+
+  // Try to open + create the file.
+rety_open_create:
+  int RandomFD = ::open(RandomPath.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
+  if (RandomFD == -1) {
+    // If the file existed, try again, otherwise, error.
+    if (errno == errc::file_exists)
+      goto retry_random_path;
+    // The path prefix doesn't exist.
+    if (errno == errc::no_such_file_or_directory) {
+      StringRef p(RandomPath.begin(), RandomPath.size());
+      SmallString<64> dir_to_create;
+      for (path::const_iterator i = path::begin(p),
+                                e = --path::end(p); i != e; ++i) {
+        path::append(dir_to_create, *i);
+        bool Exists;
+        if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec;
+        if (!Exists) {
+          // Don't try to create network paths.
+          if (i->size() > 2 && (*i)[0] == '/' &&
+                               (*i)[1] == '/' &&
+                               (*i)[2] != '/')
+            return make_error_code(errc::no_such_file_or_directory);
+          if (::mkdir(dir_to_create.c_str(), 0700) == -1)
+            return error_code(errno, system_category());
+        }
+      }
+      goto rety_open_create;
+    }
+    return error_code(errno, system_category());
+  }
+
+   // Make the path absolute.
+  char real_path_buff[PATH_MAX + 1];
+  if (realpath(RandomPath.c_str(), real_path_buff) == NULL) {
+    int error = errno;
+    ::close(RandomFD);
+    ::unlink(RandomPath.c_str());
+    return error_code(error, system_category());
+  }
+
+  result_path.clear();
+  StringRef d(real_path_buff);
+  result_path.append(d.begin(), d.end());
+
+  result_fd = RandomFD;
+  return success;
+}
+
+error_code directory_iterator_construct(directory_iterator &it, StringRef path){
+  SmallString<128> path_null(path);
+  DIR *directory = ::opendir(path_null.c_str());
+  if (directory == 0)
+    return error_code(errno, system_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);
+}
+
+error_code directory_iterator_destruct(directory_iterator& it) {
+  if (it.IterationHandle)
+    ::closedir(reinterpret_cast<DIR *>(it.IterationHandle));
+  it.IterationHandle = 0;
+  it.CurrentEntry = directory_entry();
+  return success;
+}
+
+error_code directory_iterator_increment(directory_iterator& it) {
+  errno = 0;
+  dirent *cur_dir = ::readdir(reinterpret_cast<DIR *>(it.IterationHandle));
+  if (cur_dir == 0 && errno != 0) {
+    return error_code(errno, system_category());
+  } else if (cur_dir != 0) {
+    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 success;
+}
+
+error_code get_magic(const Twine &path, uint32_t len,
+                     SmallVectorImpl<char> &result) {
+  SmallString<128> PathStorage;
+  StringRef Path = path.toNullTerminatedStringRef(PathStorage);
+  result.set_size(0);
+
+  // Open path.
+  std::FILE *file = std::fopen(Path.data(), "rb");
+  if (file == 0)
+    return error_code(errno, system_category());
+
+  // Reserve storage.
+  result.reserve(len);
+
+  // Read magic!
+  size_t size = std::fread(result.data(), 1, len, file);
+  if (std::ferror(file) != 0) {
+    std::fclose(file);
+    return error_code(errno, system_category());
+  } else if (size != result.size()) {
+    if (std::feof(file) != 0) {
+      std::fclose(file);
+      result.set_size(size);
+      return make_error_code(errc::value_too_large);
+    }
+  }
+  std::fclose(file);
+  result.set_size(len);
+  return success;
+}
+
+} // end namespace fs
+} // end namespace sys
+} // end namespace llvm