X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=unittests%2FSupport%2FPath.cpp;h=07ad3fc6b6315f15bc05eaa35d6167f8f3cd3a05;hp=a4fb518255b97e72eea99c9b442432f0d6b5c908;hb=8cda80ad2486782d40ac51cb07dfc630fee47639;hpb=da7c1cab8c083e3370cc94a23bc396cd75b7f2a7

diff --git a/unittests/Support/Path.cpp b/unittests/Support/Path.cpp
index a4fb518255b..07ad3fc6b63 100644
--- a/unittests/Support/Path.cpp
+++ b/unittests/Support/Path.cpp
@@ -7,25 +7,53 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/PathV2.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/ConvertUTF.h"
+#include "llvm/Support/Errc.h"
 #include "llvm/Support/ErrorHandling.h"
-
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
 #include "gtest/gtest.h"
 
+#ifdef LLVM_ON_WIN32
+#include <windows.h>
+#include <winerror.h>
+#endif
+
+#ifdef LLVM_ON_UNIX
+#include <sys/stat.h>
+#endif
+
 using namespace llvm;
 using namespace llvm::sys;
 
-#define ASSERT_NO_ERROR(x) \
-  if (error_code ec = x) { \
-    SmallString<128> Message; \
-    GTEST_FATAL_FAILURE_((Twine(#x) + ": did not return errc::success.\n" + \
-                         "error message: " + \
-                      x.message()).toNullTerminatedStringRef(Message).data()); \
-  } else {}
+#define ASSERT_NO_ERROR(x)                                                     \
+  if (std::error_code ASSERT_NO_ERROR_ec = x) {                                \
+    SmallString<128> MessageStorage;                                           \
+    raw_svector_ostream Message(MessageStorage);                               \
+    Message << #x ": did not return errc::success.\n"                          \
+            << "error number: " << ASSERT_NO_ERROR_ec.value() << "\n"          \
+            << "error message: " << ASSERT_NO_ERROR_ec.message() << "\n";      \
+    GTEST_FATAL_FAILURE_(MessageStorage.c_str());                              \
+  } else {                                                                     \
+  }
 
 namespace {
 
+TEST(is_separator, Works) {
+  EXPECT_TRUE(path::is_separator('/'));
+  EXPECT_FALSE(path::is_separator('\0'));
+  EXPECT_FALSE(path::is_separator('-'));
+  EXPECT_FALSE(path::is_separator(' '));
+
+#ifdef LLVM_ON_WIN32
+  EXPECT_TRUE(path::is_separator('\\'));
+#else
+  EXPECT_FALSE(path::is_separator('\\'));
+#endif
+}
+
 TEST(Support, Path) {
   SmallVector<StringRef, 40> paths;
   paths.push_back("");
@@ -69,6 +97,7 @@ TEST(Support, Path) {
   paths.push_back("c:\\foo/");
   paths.push_back("c:/foo\\bar");
 
+  SmallVector<StringRef, 5> ComponentStack;
   for (SmallVector<StringRef, 40>::const_iterator i = paths.begin(),
                                                   e = paths.end();
                                                   i != e;
@@ -78,18 +107,17 @@ TEST(Support, Path) {
                                    ci != ce;
                                    ++ci) {
       ASSERT_FALSE(ci->empty());
+      ComponentStack.push_back(*ci);
     }
 
-#if 0 // Valgrind is whining about this.
-    outs() << "    Reverse Iteration: [";
     for (sys::path::reverse_iterator ci = sys::path::rbegin(*i),
                                      ce = sys::path::rend(*i);
                                      ci != ce;
                                      ++ci) {
-      outs() << *ci << ',';
+      ASSERT_TRUE(*ci == ComponentStack.back());
+      ComponentStack.pop_back();
     }
-    outs() << "]\n";
-#endif
+    ASSERT_TRUE(ComponentStack.empty());
 
     path::has_root_path(*i);
     path::root_path(*i);
@@ -119,71 +147,721 @@ TEST(Support, Path) {
     StringRef filename(temp_store.begin(), temp_store.size()), stem, ext;
     stem = path::stem(filename);
     ext  = path::extension(filename);
-    EXPECT_EQ(*(--sys::path::end(filename)), (stem + ext).str());
+    EXPECT_EQ(*sys::path::rbegin(filename), (stem + ext).str());
 
     path::native(*i, temp_store);
   }
 
+  SmallString<32> Relative("foo.cpp");
+  ASSERT_NO_ERROR(sys::fs::make_absolute("/root", Relative));
+  Relative[5] = '/'; // Fix up windows paths.
+  ASSERT_EQ("/root/foo.cpp", Relative);
+}
+
+TEST(Support, RelativePathIterator) {
+  SmallString<64> Path(StringRef("c/d/e/foo.txt"));
+  typedef SmallVector<StringRef, 4> PathComponents;
+  PathComponents ExpectedPathComponents;
+  PathComponents ActualPathComponents;
+
+  StringRef(Path).split(ExpectedPathComponents, '/');
+
+  for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
+       ++I) {
+    ActualPathComponents.push_back(*I);
+  }
+
+  ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
+
+  for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
+    EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
+  }
+}
+
+TEST(Support, RelativePathDotIterator) {
+  SmallString<64> Path(StringRef(".c/.d/../."));
+  typedef SmallVector<StringRef, 4> PathComponents;
+  PathComponents ExpectedPathComponents;
+  PathComponents ActualPathComponents;
+
+  StringRef(Path).split(ExpectedPathComponents, '/');
+
+  for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
+       ++I) {
+    ActualPathComponents.push_back(*I);
+  }
+
+  ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
+
+  for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
+    EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
+  }
+}
+
+TEST(Support, AbsolutePathIterator) {
+  SmallString<64> Path(StringRef("/c/d/e/foo.txt"));
+  typedef SmallVector<StringRef, 4> PathComponents;
+  PathComponents ExpectedPathComponents;
+  PathComponents ActualPathComponents;
+
+  StringRef(Path).split(ExpectedPathComponents, '/');
+
+  // The root path will also be a component when iterating
+  ExpectedPathComponents[0] = "/";
+
+  for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
+       ++I) {
+    ActualPathComponents.push_back(*I);
+  }
+
+  ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
+
+  for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
+    EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
+  }
+}
+
+TEST(Support, AbsolutePathDotIterator) {
+  SmallString<64> Path(StringRef("/.c/.d/../."));
+  typedef SmallVector<StringRef, 4> PathComponents;
+  PathComponents ExpectedPathComponents;
+  PathComponents ActualPathComponents;
+
+  StringRef(Path).split(ExpectedPathComponents, '/');
+
+  // The root path will also be a component when iterating
+  ExpectedPathComponents[0] = "/";
+
+  for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
+       ++I) {
+    ActualPathComponents.push_back(*I);
+  }
+
+  ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
+
+  for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
+    EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
+  }
+}
+
+#ifdef LLVM_ON_WIN32
+TEST(Support, AbsolutePathIteratorWin32) {
+  SmallString<64> Path(StringRef("c:\\c\\e\\foo.txt"));
+  typedef SmallVector<StringRef, 4> PathComponents;
+  PathComponents ExpectedPathComponents;
+  PathComponents ActualPathComponents;
+
+  StringRef(Path).split(ExpectedPathComponents, "\\");
+
+  // The root path (which comes after the drive name) will also be a component
+  // when iterating.
+  ExpectedPathComponents.insert(ExpectedPathComponents.begin()+1, "\\");
+
+  for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
+       ++I) {
+    ActualPathComponents.push_back(*I);
+  }
+
+  ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
+
+  for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
+    EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
+  }
+}
+#endif // LLVM_ON_WIN32
+
+TEST(Support, AbsolutePathIteratorEnd) {
+  // Trailing slashes are converted to '.' unless they are part of the root path.
+  SmallVector<StringRef, 4> Paths;
+  Paths.push_back("/foo/");
+  Paths.push_back("/foo//");
+  Paths.push_back("//net//");
+#ifdef LLVM_ON_WIN32
+  Paths.push_back("c:\\\\");
+#endif
+
+  for (StringRef Path : Paths) {
+    StringRef LastComponent = *path::rbegin(Path);
+    EXPECT_EQ(".", LastComponent);
+  }
+
+  SmallVector<StringRef, 3> RootPaths;
+  RootPaths.push_back("/");
+  RootPaths.push_back("//net/");
+#ifdef LLVM_ON_WIN32
+  RootPaths.push_back("c:\\");
+#endif
+
+  for (StringRef Path : RootPaths) {
+    StringRef LastComponent = *path::rbegin(Path);
+    EXPECT_EQ(1u, LastComponent.size());
+    EXPECT_TRUE(path::is_separator(LastComponent[0]));
+  }
+}
+
+TEST(Support, HomeDirectory) {
+  std::string expected;
+#ifdef LLVM_ON_WIN32
+  if (wchar_t const *path = ::_wgetenv(L"USERPROFILE")) {
+    auto pathLen = ::wcslen(path);
+    ArrayRef<char> ref{reinterpret_cast<char const *>(path),
+                       pathLen * sizeof(wchar_t)};
+    convertUTF16ToUTF8String(ref, expected);
+  }
+#else
+  if (char const *path = ::getenv("HOME"))
+    expected = path;
+#endif
+  // Do not try to test it if we don't know what to expect.
+  // On Windows we use something better than env vars.
+  if (!expected.empty()) {
+    SmallString<128> HomeDir;
+    auto status = path::home_directory(HomeDir);
+    EXPECT_TRUE(status);
+    EXPECT_EQ(expected, HomeDir);
+  }
+}
+
+TEST(Support, UserCacheDirectory) {
+  SmallString<13> CacheDir;
+  SmallString<20> CacheDir2;
+  auto Status = path::user_cache_directory(CacheDir, "");
+  EXPECT_TRUE(Status ^ CacheDir.empty());
+
+  if (Status) {
+    EXPECT_TRUE(path::user_cache_directory(CacheDir2, "")); // should succeed
+    EXPECT_EQ(CacheDir, CacheDir2); // and return same paths
+
+    EXPECT_TRUE(path::user_cache_directory(CacheDir, "A", "B", "file.c"));
+    auto It = path::rbegin(CacheDir);
+    EXPECT_EQ("file.c", *It);
+    EXPECT_EQ("B", *++It);
+    EXPECT_EQ("A", *++It);
+    auto ParentDir = *++It;
+
+    // Test Unicode: "<user_cache_dir>/(pi)r^2/aleth.0"
+    EXPECT_TRUE(path::user_cache_directory(CacheDir2, "\xCF\x80r\xC2\xB2",
+                                           "\xE2\x84\xB5.0"));
+    auto It2 = path::rbegin(CacheDir2);
+    EXPECT_EQ("\xE2\x84\xB5.0", *It2);
+    EXPECT_EQ("\xCF\x80r\xC2\xB2", *++It2);
+    auto ParentDir2 = *++It2;
+
+    EXPECT_EQ(ParentDir, ParentDir2);
+  }
+}
+
+class FileSystemTest : public testing::Test {
+protected:
+  /// Unique temporary directory in which all created filesystem entities must
+  /// be placed. It is removed at the end of each test (must be empty).
+  SmallString<128> TestDirectory;
+
+  void SetUp() override {
+    ASSERT_NO_ERROR(
+        fs::createUniqueDirectory("file-system-test", TestDirectory));
+    // We don't care about this specific file.
+    errs() << "Test Directory: " << TestDirectory << '\n';
+    errs().flush();
+  }
+
+  void TearDown() override { ASSERT_NO_ERROR(fs::remove(TestDirectory.str())); }
+};
+
+TEST_F(FileSystemTest, Unique) {
+  // Create a temp file.
+  int FileDescriptor;
+  SmallString<64> TempPath;
+  ASSERT_NO_ERROR(
+      fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
+
+  // The same file should return an identical unique id.
+  fs::UniqueID F1, F2;
+  ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), F1));
+  ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), F2));
+  ASSERT_EQ(F1, F2);
+
+  // Different files should return different unique ids.
+  int FileDescriptor2;
+  SmallString<64> TempPath2;
+  ASSERT_NO_ERROR(
+      fs::createTemporaryFile("prefix", "temp", FileDescriptor2, TempPath2));
+
+  fs::UniqueID D;
+  ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath2), D));
+  ASSERT_NE(D, F1);
+  ::close(FileDescriptor2);
+
+  ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
+
+  // Two paths representing the same file on disk should still provide the
+  // same unique id.  We can test this by making a hard link.
+  ASSERT_NO_ERROR(fs::create_link(Twine(TempPath), Twine(TempPath2)));
+  fs::UniqueID D2;
+  ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath2), D2));
+  ASSERT_EQ(D2, F1);
+
+  ::close(FileDescriptor);
+
+  SmallString<128> Dir1;
+  ASSERT_NO_ERROR(
+     fs::createUniqueDirectory("dir1", Dir1));
+  ASSERT_NO_ERROR(fs::getUniqueID(Dir1.c_str(), F1));
+  ASSERT_NO_ERROR(fs::getUniqueID(Dir1.c_str(), F2));
+  ASSERT_EQ(F1, F2);
+
+  SmallString<128> Dir2;
+  ASSERT_NO_ERROR(
+     fs::createUniqueDirectory("dir2", Dir2));
+  ASSERT_NO_ERROR(fs::getUniqueID(Dir2.c_str(), F2));
+  ASSERT_NE(F1, F2);
+}
+
+TEST_F(FileSystemTest, TempFiles) {
   // Create a temp file.
   int FileDescriptor;
   SmallString<64> TempPath;
   ASSERT_NO_ERROR(
-    fs::unique_file("%%-%%-%%-%%.temp", FileDescriptor, TempPath));
+      fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 
   // Make sure it exists.
-  bool TempFileExists;
-  ASSERT_NO_ERROR(sys::fs::exists(Twine(TempPath), TempFileExists));
-  EXPECT_TRUE(TempFileExists);
+  ASSERT_TRUE(sys::fs::exists(Twine(TempPath)));
 
   // Create another temp tile.
   int FD2;
   SmallString<64> TempPath2;
-  ASSERT_NO_ERROR(fs::unique_file("%%-%%-%%-%%.temp", FD2, TempPath2));
+  ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "temp", FD2, TempPath2));
+  ASSERT_TRUE(TempPath2.endswith(".temp"));
   ASSERT_NE(TempPath.str(), TempPath2.str());
 
-  // Try to copy the first to the second.
-  EXPECT_EQ(
-    fs::copy_file(Twine(TempPath), Twine(TempPath2)), errc::file_exists);
+  fs::file_status A, B;
+  ASSERT_NO_ERROR(fs::status(Twine(TempPath), A));
+  ASSERT_NO_ERROR(fs::status(Twine(TempPath2), B));
+  EXPECT_FALSE(fs::equivalent(A, B));
 
   ::close(FD2);
-  // Try again with the proper options.
-  ASSERT_NO_ERROR(fs::copy_file(Twine(TempPath), Twine(TempPath2),
-                                fs::copy_option::overwrite_if_exists));
+
   // Remove Temp2.
-  ASSERT_NO_ERROR(fs::remove(Twine(TempPath2), TempFileExists));
-  EXPECT_TRUE(TempFileExists);
+  ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
+  ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
+  ASSERT_EQ(fs::remove(Twine(TempPath2), false),
+            errc::no_such_file_or_directory);
+
+  std::error_code EC = fs::status(TempPath2.c_str(), B);
+  EXPECT_EQ(EC, errc::no_such_file_or_directory);
+  EXPECT_EQ(B.type(), fs::file_type::file_not_found);
 
   // Make sure Temp2 doesn't exist.
-  ASSERT_NO_ERROR(fs::exists(Twine(TempPath2), TempFileExists));
-  EXPECT_FALSE(TempFileExists);
+  ASSERT_EQ(fs::access(Twine(TempPath2), sys::fs::AccessMode::Exist),
+            errc::no_such_file_or_directory);
+
+  SmallString<64> TempPath3;
+  ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "", TempPath3));
+  ASSERT_FALSE(TempPath3.endswith("."));
 
   // Create a hard link to Temp1.
-  ASSERT_NO_ERROR(fs::create_hard_link(Twine(TempPath), Twine(TempPath2)));
+  ASSERT_NO_ERROR(fs::create_link(Twine(TempPath), Twine(TempPath2)));
   bool equal;
   ASSERT_NO_ERROR(fs::equivalent(Twine(TempPath), Twine(TempPath2), equal));
   EXPECT_TRUE(equal);
+  ASSERT_NO_ERROR(fs::status(Twine(TempPath), A));
+  ASSERT_NO_ERROR(fs::status(Twine(TempPath2), B));
+  EXPECT_TRUE(fs::equivalent(A, B));
 
   // Remove Temp1.
   ::close(FileDescriptor);
-  ASSERT_NO_ERROR(fs::remove(Twine(TempPath), TempFileExists));
-  EXPECT_TRUE(TempFileExists);
+  ASSERT_NO_ERROR(fs::remove(Twine(TempPath)));
 
   // Remove the hard link.
-  ASSERT_NO_ERROR(fs::remove(Twine(TempPath2), TempFileExists));
-  EXPECT_TRUE(TempFileExists);
+  ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
 
   // Make sure Temp1 doesn't exist.
-  ASSERT_NO_ERROR(fs::exists(Twine(TempPath), TempFileExists));
-  EXPECT_FALSE(TempFileExists);
-
-  error_code ec;
-  for (fs::directory_iterator i(".", ec), e; i != e; i.increment(ec)) {
-    if (ec) {
-      errs() << ec.message() << '\n';
-      errs().flush();
-      report_fatal_error("Directory iteration failed!");
+  ASSERT_EQ(fs::access(Twine(TempPath), sys::fs::AccessMode::Exist),
+            errc::no_such_file_or_directory);
+
+#ifdef LLVM_ON_WIN32
+  // Path name > 260 chars should get an error.
+  const char *Path270 =
+    "abcdefghijklmnopqrstuvwxyz9abcdefghijklmnopqrstuvwxyz8"
+    "abcdefghijklmnopqrstuvwxyz7abcdefghijklmnopqrstuvwxyz6"
+    "abcdefghijklmnopqrstuvwxyz5abcdefghijklmnopqrstuvwxyz4"
+    "abcdefghijklmnopqrstuvwxyz3abcdefghijklmnopqrstuvwxyz2"
+    "abcdefghijklmnopqrstuvwxyz1abcdefghijklmnopqrstuvwxyz0";
+  EXPECT_EQ(fs::createUniqueFile(Path270, FileDescriptor, TempPath),
+            errc::invalid_argument);
+  // Relative path < 247 chars, no problem.
+  const char *Path216 =
+    "abcdefghijklmnopqrstuvwxyz7abcdefghijklmnopqrstuvwxyz6"
+    "abcdefghijklmnopqrstuvwxyz5abcdefghijklmnopqrstuvwxyz4"
+    "abcdefghijklmnopqrstuvwxyz3abcdefghijklmnopqrstuvwxyz2"
+    "abcdefghijklmnopqrstuvwxyz1abcdefghijklmnopqrstuvwxyz0";
+  ASSERT_NO_ERROR(fs::createTemporaryFile(Path216, "", TempPath));
+  ASSERT_NO_ERROR(fs::remove(Twine(TempPath)));
+#endif
+}
+
+TEST_F(FileSystemTest, CreateDir) {
+  ASSERT_NO_ERROR(fs::create_directory(Twine(TestDirectory) + "foo"));
+  ASSERT_NO_ERROR(fs::create_directory(Twine(TestDirectory) + "foo"));
+  ASSERT_EQ(fs::create_directory(Twine(TestDirectory) + "foo", false),
+            errc::file_exists);
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "foo"));
+
+#ifdef LLVM_ON_UNIX
+  // Set a 0000 umask so that we can test our directory permissions.
+  mode_t OldUmask = ::umask(0000);
+
+  fs::file_status Status;
+  ASSERT_NO_ERROR(
+      fs::create_directory(Twine(TestDirectory) + "baz500", false,
+                           fs::perms::owner_read | fs::perms::owner_exe));
+  ASSERT_NO_ERROR(fs::status(Twine(TestDirectory) + "baz500", Status));
+  ASSERT_EQ(Status.permissions() & fs::perms::all_all,
+            fs::perms::owner_read | fs::perms::owner_exe);
+  ASSERT_NO_ERROR(fs::create_directory(Twine(TestDirectory) + "baz777", false,
+                                       fs::perms::all_all));
+  ASSERT_NO_ERROR(fs::status(Twine(TestDirectory) + "baz777", Status));
+  ASSERT_EQ(Status.permissions() & fs::perms::all_all, fs::perms::all_all);
+
+  // Restore umask to be safe.
+  ::umask(OldUmask);
+#endif
+
+#ifdef LLVM_ON_WIN32
+  // Prove that create_directories() can handle a pathname > 248 characters,
+  // which is the documented limit for CreateDirectory().
+  // (248 is MAX_PATH subtracting room for an 8.3 filename.)
+  // Generate a directory path guaranteed to fall into that range.
+  size_t TmpLen = TestDirectory.size();
+  const char *OneDir = "\\123456789";
+  size_t OneDirLen = strlen(OneDir);
+  ASSERT_LT(OneDirLen, 12U);
+  size_t NLevels = ((248 - TmpLen) / OneDirLen) + 1;
+  SmallString<260> LongDir(TestDirectory);
+  for (size_t I = 0; I < NLevels; ++I)
+    LongDir.append(OneDir);
+  ASSERT_NO_ERROR(fs::create_directories(Twine(LongDir)));
+  ASSERT_NO_ERROR(fs::create_directories(Twine(LongDir)));
+  ASSERT_EQ(fs::create_directories(Twine(LongDir), false),
+            errc::file_exists);
+  // Tidy up, "recursively" removing the directories.
+  StringRef ThisDir(LongDir);
+  for (size_t J = 0; J < NLevels; ++J) {
+    ASSERT_NO_ERROR(fs::remove(ThisDir));
+    ThisDir = path::parent_path(ThisDir);
+  }
+
+  // Similarly for a relative pathname.  Need to set the current directory to
+  // TestDirectory so that the one we create ends up in the right place.
+  char PreviousDir[260];
+  size_t PreviousDirLen = ::GetCurrentDirectoryA(260, PreviousDir);
+  ASSERT_GT(PreviousDirLen, 0U);
+  ASSERT_LT(PreviousDirLen, 260U);
+  ASSERT_NE(::SetCurrentDirectoryA(TestDirectory.c_str()), 0);
+  LongDir.clear();
+  // Generate a relative directory name with absolute length > 248.
+  size_t LongDirLen = 249 - TestDirectory.size();
+  LongDir.assign(LongDirLen, 'a');
+  ASSERT_NO_ERROR(fs::create_directory(Twine(LongDir)));
+  // While we're here, prove that .. and . handling works in these long paths.
+  const char *DotDotDirs = "\\..\\.\\b";
+  LongDir.append(DotDotDirs);
+  ASSERT_NO_ERROR(fs::create_directory("b"));
+  ASSERT_EQ(fs::create_directory(Twine(LongDir), false), errc::file_exists);
+  // And clean up.
+  ASSERT_NO_ERROR(fs::remove("b"));
+  ASSERT_NO_ERROR(fs::remove(
+    Twine(LongDir.substr(0, LongDir.size() - strlen(DotDotDirs)))));
+  ASSERT_NE(::SetCurrentDirectoryA(PreviousDir), 0);
+#endif
+}
+
+TEST_F(FileSystemTest, DirectoryIteration) {
+  std::error_code ec;
+  for (fs::directory_iterator i(".", ec), e; i != e; i.increment(ec))
+    ASSERT_NO_ERROR(ec);
+
+  // Create a known hierarchy to recurse over.
+  ASSERT_NO_ERROR(
+      fs::create_directories(Twine(TestDirectory) + "/recursive/a0/aa1"));
+  ASSERT_NO_ERROR(
+      fs::create_directories(Twine(TestDirectory) + "/recursive/a0/ab1"));
+  ASSERT_NO_ERROR(fs::create_directories(Twine(TestDirectory) +
+                                         "/recursive/dontlookhere/da1"));
+  ASSERT_NO_ERROR(
+      fs::create_directories(Twine(TestDirectory) + "/recursive/z0/za1"));
+  ASSERT_NO_ERROR(
+      fs::create_directories(Twine(TestDirectory) + "/recursive/pop/p1"));
+  typedef std::vector<std::string> v_t;
+  v_t visited;
+  for (fs::recursive_directory_iterator i(Twine(TestDirectory)
+         + "/recursive", ec), e; i != e; i.increment(ec)){
+    ASSERT_NO_ERROR(ec);
+    if (path::filename(i->path()) == "p1") {
+      i.pop();
+      // FIXME: recursive_directory_iterator should be more robust.
+      if (i == e) break;
     }
+    if (path::filename(i->path()) == "dontlookhere")
+      i.no_push();
+    visited.push_back(path::filename(i->path()));
+  }
+  v_t::const_iterator a0 = std::find(visited.begin(), visited.end(), "a0");
+  v_t::const_iterator aa1 = std::find(visited.begin(), visited.end(), "aa1");
+  v_t::const_iterator ab1 = std::find(visited.begin(), visited.end(), "ab1");
+  v_t::const_iterator dontlookhere = std::find(visited.begin(), visited.end(),
+                                               "dontlookhere");
+  v_t::const_iterator da1 = std::find(visited.begin(), visited.end(), "da1");
+  v_t::const_iterator z0 = std::find(visited.begin(), visited.end(), "z0");
+  v_t::const_iterator za1 = std::find(visited.begin(), visited.end(), "za1");
+  v_t::const_iterator pop = std::find(visited.begin(), visited.end(), "pop");
+  v_t::const_iterator p1 = std::find(visited.begin(), visited.end(), "p1");
+
+  // Make sure that each path was visited correctly.
+  ASSERT_NE(a0, visited.end());
+  ASSERT_NE(aa1, visited.end());
+  ASSERT_NE(ab1, visited.end());
+  ASSERT_NE(dontlookhere, visited.end());
+  ASSERT_EQ(da1, visited.end()); // Not visited.
+  ASSERT_NE(z0, visited.end());
+  ASSERT_NE(za1, visited.end());
+  ASSERT_NE(pop, visited.end());
+  ASSERT_EQ(p1, visited.end()); // Not visited.
+
+  // Make sure that parents were visited before children. No other ordering
+  // guarantees can be made across siblings.
+  ASSERT_LT(a0, aa1);
+  ASSERT_LT(a0, ab1);
+  ASSERT_LT(z0, za1);
+
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0/aa1"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0/ab1"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0"));
+  ASSERT_NO_ERROR(
+      fs::remove(Twine(TestDirectory) + "/recursive/dontlookhere/da1"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/dontlookhere"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/pop/p1"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/pop"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/z0/za1"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/z0"));
+  ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive"));
+}
+
+const char archive[] = "!<arch>\x0A";
+const char bitcode[] = "\xde\xc0\x17\x0b";
+const char coff_object[] = "\x00\x00......";
+const char coff_bigobj[] = "\x00\x00\xff\xff\x00\x02......"
+    "\xc7\xa1\xba\xd1\xee\xba\xa9\x4b\xaf\x20\xfa\xf6\x6a\xa4\xdc\xb8";
+const char coff_import_library[] = "\x00\x00\xff\xff....";
+const char elf_relocatable[] = { 0x7f, 'E', 'L', 'F', 1, 2, 1, 0, 0,
+                                 0,    0,   0,   0,   0, 0, 0, 0, 1 };
+const char macho_universal_binary[] = "\xca\xfe\xba\xbe...\0x00";
+const char macho_object[] = "\xfe\xed\xfa\xce..........\x00\x01";
+const char macho_executable[] = "\xfe\xed\xfa\xce..........\x00\x02";
+const char macho_fixed_virtual_memory_shared_lib[] =
+    "\xfe\xed\xfa\xce..........\x00\x03";
+const char macho_core[] = "\xfe\xed\xfa\xce..........\x00\x04";
+const char macho_preload_executable[] = "\xfe\xed\xfa\xce..........\x00\x05";
+const char macho_dynamically_linked_shared_lib[] =
+    "\xfe\xed\xfa\xce..........\x00\x06";
+const char macho_dynamic_linker[] = "\xfe\xed\xfa\xce..........\x00\x07";
+const char macho_bundle[] = "\xfe\xed\xfa\xce..........\x00\x08";
+const char macho_dsym_companion[] = "\xfe\xed\xfa\xce..........\x00\x0a";
+const char macho_kext_bundle[] = "\xfe\xed\xfa\xce..........\x00\x0b";
+const char windows_resource[] = "\x00\x00\x00\x00\x020\x00\x00\x00\xff";
+const char macho_dynamically_linked_shared_lib_stub[] =
+    "\xfe\xed\xfa\xce..........\x00\x09";
+
+TEST_F(FileSystemTest, Magic) {
+  struct type {
+    const char *filename;
+    const char *magic_str;
+    size_t magic_str_len;
+    fs::file_magic magic;
+  } types[] = {
+#define DEFINE(magic)                                           \
+    { #magic, magic, sizeof(magic), fs::file_magic::magic }
+    DEFINE(archive),
+    DEFINE(bitcode),
+    DEFINE(coff_object),
+    { "coff_bigobj", coff_bigobj, sizeof(coff_bigobj), fs::file_magic::coff_object },
+    DEFINE(coff_import_library),
+    DEFINE(elf_relocatable),
+    DEFINE(macho_universal_binary),
+    DEFINE(macho_object),
+    DEFINE(macho_executable),
+    DEFINE(macho_fixed_virtual_memory_shared_lib),
+    DEFINE(macho_core),
+    DEFINE(macho_preload_executable),
+    DEFINE(macho_dynamically_linked_shared_lib),
+    DEFINE(macho_dynamic_linker),
+    DEFINE(macho_bundle),
+    DEFINE(macho_dynamically_linked_shared_lib_stub),
+    DEFINE(macho_dsym_companion),
+    DEFINE(macho_kext_bundle),
+    DEFINE(windows_resource)
+#undef DEFINE
+    };
+
+  // Create some files filled with magic.
+  for (type *i = types, *e = types + (sizeof(types) / sizeof(type)); i != e;
+                                                                     ++i) {
+    SmallString<128> file_pathname(TestDirectory);
+    path::append(file_pathname, i->filename);
+    std::error_code EC;
+    raw_fd_ostream file(file_pathname, EC, sys::fs::F_None);
+    ASSERT_FALSE(file.has_error());
+    StringRef magic(i->magic_str, i->magic_str_len);
+    file << magic;
+    file.close();
+    EXPECT_EQ(i->magic, fs::identify_magic(magic));
+    ASSERT_NO_ERROR(fs::remove(Twine(file_pathname)));
+  }
+}
+
+#ifdef LLVM_ON_WIN32
+TEST_F(FileSystemTest, CarriageReturn) {
+  SmallString<128> FilePathname(TestDirectory);
+  std::error_code EC;
+  path::append(FilePathname, "test");
+
+  {
+    raw_fd_ostream File(FilePathname, EC, sys::fs::F_Text);
+    ASSERT_NO_ERROR(EC);
+    File << '\n';
+  }
+  {
+    auto Buf = MemoryBuffer::getFile(FilePathname.str());
+    EXPECT_TRUE((bool)Buf);
+    EXPECT_EQ(Buf.get()->getBuffer(), "\r\n");
+  }
+
+  {
+    raw_fd_ostream File(FilePathname, EC, sys::fs::F_None);
+    ASSERT_NO_ERROR(EC);
+    File << '\n';
+  }
+  {
+    auto Buf = MemoryBuffer::getFile(FilePathname.str());
+    EXPECT_TRUE((bool)Buf);
+    EXPECT_EQ(Buf.get()->getBuffer(), "\n");
+  }
+  ASSERT_NO_ERROR(fs::remove(Twine(FilePathname)));
+}
+#endif
+
+TEST_F(FileSystemTest, Resize) {
+  int FD;
+  SmallString<64> TempPath;
+  ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "temp", FD, TempPath));
+  ASSERT_NO_ERROR(fs::resize_file(FD, 123));
+  fs::file_status Status;
+  ASSERT_NO_ERROR(fs::status(FD, Status));
+  ASSERT_EQ(Status.getSize(), 123U);
+}
+
+TEST_F(FileSystemTest, FileMapping) {
+  // Create a temp file.
+  int FileDescriptor;
+  SmallString<64> TempPath;
+  ASSERT_NO_ERROR(
+      fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
+  unsigned Size = 4096;
+  ASSERT_NO_ERROR(fs::resize_file(FileDescriptor, Size));
+
+  // Map in temp file and add some content
+  std::error_code EC;
+  StringRef Val("hello there");
+  {
+    fs::mapped_file_region mfr(FileDescriptor,
+                               fs::mapped_file_region::readwrite, Size, 0, EC);
+    ASSERT_NO_ERROR(EC);
+    std::copy(Val.begin(), Val.end(), mfr.data());
+    // Explicitly add a 0.
+    mfr.data()[Val.size()] = 0;
+    // Unmap temp file
   }
+
+  // Map it back in read-only
+  int FD;
+  EC = fs::openFileForRead(Twine(TempPath), FD);
+  ASSERT_NO_ERROR(EC);
+  fs::mapped_file_region mfr(FD, fs::mapped_file_region::readonly, Size, 0, EC);
+  ASSERT_NO_ERROR(EC);
+
+  // Verify content
+  EXPECT_EQ(StringRef(mfr.const_data()), Val);
+
+  // Unmap temp file
+  fs::mapped_file_region m(FD, fs::mapped_file_region::readonly, Size, 0, EC);
+  ASSERT_NO_ERROR(EC);
+  ASSERT_EQ(close(FD), 0);
+}
+
+TEST(Support, NormalizePath) {
+#if defined(LLVM_ON_WIN32)
+#define EXPECT_PATH_IS(path__, windows__, not_windows__)                        \
+  EXPECT_EQ(path__, windows__);
+#else
+#define EXPECT_PATH_IS(path__, windows__, not_windows__)                        \
+  EXPECT_EQ(path__, not_windows__);
+#endif
+
+  SmallString<64> Path1("a");
+  SmallString<64> Path2("a/b");
+  SmallString<64> Path3("a\\b");
+  SmallString<64> Path4("a\\\\b");
+  SmallString<64> Path5("\\a");
+  SmallString<64> Path6("a\\");
+
+  path::native(Path1);
+  EXPECT_PATH_IS(Path1, "a", "a");
+
+  path::native(Path2);
+  EXPECT_PATH_IS(Path2, "a\\b", "a/b");
+
+  path::native(Path3);
+  EXPECT_PATH_IS(Path3, "a\\b", "a/b");
+
+  path::native(Path4);
+  EXPECT_PATH_IS(Path4, "a\\\\b", "a\\\\b");
+
+  path::native(Path5);
+  EXPECT_PATH_IS(Path5, "\\a", "/a");
+
+  path::native(Path6);
+  EXPECT_PATH_IS(Path6, "a\\", "a/");
+
+#undef EXPECT_PATH_IS
+}
+
+TEST(Support, RemoveLeadingDotSlash) {
+  StringRef Path1("././/foolz/wat");
+  StringRef Path2("./////");
+
+  Path1 = path::remove_leading_dotslash(Path1);
+  EXPECT_EQ(Path1, "foolz/wat");
+  Path2 = path::remove_leading_dotslash(Path2);
+  EXPECT_EQ(Path2, "");
 }
 
+static std::string remove_dots(StringRef path,
+    bool remove_dot_dot) {
+  SmallString<256> buffer(path);
+  path::remove_dots(buffer, remove_dot_dot);
+  return buffer.str();
+}
+
+TEST(Support, RemoveDots) {
+  EXPECT_EQ("foolz/wat", remove_dots("././/foolz/wat", false));
+  EXPECT_EQ("", remove_dots("./////", false));
+
+  EXPECT_EQ("a/../b/c", remove_dots("./a/../b/c", false));
+  EXPECT_EQ("b/c", remove_dots("./a/../b/c", true));
+  EXPECT_EQ("c", remove_dots("././c", true));
+
+  SmallString<64> Path1("././c");
+  EXPECT_TRUE(path::remove_dots(Path1, true));
+  EXPECT_EQ("c", Path1);
+}
 } // anonymous namespace