unittests/Support/Path.cpp

   1 //===- llvm/unittest/Support/Path.cpp - Path tests ------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Support/Path.h"
  11 #include "llvm/Support/ConvertUTF.h"
  12 #include "llvm/Support/Errc.h"
  13 #include "llvm/Support/ErrorHandling.h"
  14 #include "llvm/Support/FileSystem.h"
  15 #include "llvm/Support/MemoryBuffer.h"
  16 #include "llvm/Support/raw_ostream.h"
  17 #include "gtest/gtest.h"
  18
  19 #ifdef LLVM_ON_WIN32
  20 #include "llvm/ADT/ArrayRef.h"
  21 #include <windows.h>
  22 #include <winerror.h>
  23 #endif
  24
  25 #ifdef LLVM_ON_UNIX
  26 #include <sys/stat.h>
  27 #endif
  28
  29 using namespace llvm;
  30 using namespace llvm::sys;
  31
  32 #define ASSERT_NO_ERROR(x)                                                     \
  33   if (std::error_code ASSERT_NO_ERROR_ec = x) {                                \
  34     SmallString<128> MessageStorage;                                           \
  35     raw_svector_ostream Message(MessageStorage);                               \
  36     Message << #x ": did not return errc::success.\n"                          \
  37             << "error number: " << ASSERT_NO_ERROR_ec.value() << "\n"          \
  38             << "error message: " << ASSERT_NO_ERROR_ec.message() << "\n";      \
  39     GTEST_FATAL_FAILURE_(MessageStorage.c_str());                              \
  40   } else {                                                                     \
  41   }
  42
  43 namespace {
  44
  45 TEST(is_separator, Works) {
  46   EXPECT_TRUE(path::is_separator('/'));
  47   EXPECT_FALSE(path::is_separator('\0'));
  48   EXPECT_FALSE(path::is_separator('-'));
  49   EXPECT_FALSE(path::is_separator(' '));
  50
  51 #ifdef LLVM_ON_WIN32
  52   EXPECT_TRUE(path::is_separator('\\'));
  53 #else
  54   EXPECT_FALSE(path::is_separator('\\'));
  55 #endif
  56 }
  57
  58 TEST(Support, Path) {
  59   SmallVector<StringRef, 40> paths;
  60   paths.push_back("");
  61   paths.push_back(".");
  62   paths.push_back("..");
  63   paths.push_back("foo");
  64   paths.push_back("/");
  65   paths.push_back("/foo");
  66   paths.push_back("foo/");
  67   paths.push_back("/foo/");
  68   paths.push_back("foo/bar");
  69   paths.push_back("/foo/bar");
  70   paths.push_back("//net");
  71   paths.push_back("//net/foo");
  72   paths.push_back("///foo///");
  73   paths.push_back("///foo///bar");
  74   paths.push_back("/.");
  75   paths.push_back("./");
  76   paths.push_back("/..");
  77   paths.push_back("../");
  78   paths.push_back("foo/.");
  79   paths.push_back("foo/..");
  80   paths.push_back("foo/./");
  81   paths.push_back("foo/./bar");
  82   paths.push_back("foo/..");
  83   paths.push_back("foo/../");
  84   paths.push_back("foo/../bar");
  85   paths.push_back("c:");
  86   paths.push_back("c:/");
  87   paths.push_back("c:foo");
  88   paths.push_back("c:/foo");
  89   paths.push_back("c:foo/");
  90   paths.push_back("c:/foo/");
  91   paths.push_back("c:/foo/bar");
  92   paths.push_back("prn:");
  93   paths.push_back("c:\\");
  94   paths.push_back("c:foo");
  95   paths.push_back("c:\\foo");
  96   paths.push_back("c:foo\\");
  97   paths.push_back("c:\\foo\\");
  98   paths.push_back("c:\\foo/");
  99   paths.push_back("c:/foo\\bar");
 100
 101   SmallVector<StringRef, 5> ComponentStack;
 102   for (SmallVector<StringRef, 40>::const_iterator i = paths.begin(),
 103                                                   e = paths.end();
 104                                                   i != e;
 105                                                   ++i) {
 106     for (sys::path::const_iterator ci = sys::path::begin(*i),
 107                                    ce = sys::path::end(*i);
 108                                    ci != ce;
 109                                    ++ci) {
 110       ASSERT_FALSE(ci->empty());
 111       ComponentStack.push_back(*ci);
 112     }
 113
 114     for (sys::path::reverse_iterator ci = sys::path::rbegin(*i),
 115                                      ce = sys::path::rend(*i);
 116                                      ci != ce;
 117                                      ++ci) {
 118       ASSERT_TRUE(*ci == ComponentStack.back());
 119       ComponentStack.pop_back();
 120     }
 121     ASSERT_TRUE(ComponentStack.empty());
 122
 123     path::has_root_path(*i);
 124     path::root_path(*i);
 125     path::has_root_name(*i);
 126     path::root_name(*i);
 127     path::has_root_directory(*i);
 128     path::root_directory(*i);
 129     path::has_parent_path(*i);
 130     path::parent_path(*i);
 131     path::has_filename(*i);
 132     path::filename(*i);
 133     path::has_stem(*i);
 134     path::stem(*i);
 135     path::has_extension(*i);
 136     path::extension(*i);
 137     path::is_absolute(*i);
 138     path::is_relative(*i);
 139
 140     SmallString<128> temp_store;
 141     temp_store = *i;
 142     ASSERT_NO_ERROR(fs::make_absolute(temp_store));
 143     temp_store = *i;
 144     path::remove_filename(temp_store);
 145
 146     temp_store = *i;
 147     path::replace_extension(temp_store, "ext");
 148     StringRef filename(temp_store.begin(), temp_store.size()), stem, ext;
 149     stem = path::stem(filename);
 150     ext  = path::extension(filename);
 151     EXPECT_EQ(*sys::path::rbegin(filename), (stem + ext).str());
 152
 153     path::native(*i, temp_store);
 154   }
 155
 156   SmallString<32> Relative("foo.cpp");
 157   ASSERT_NO_ERROR(sys::fs::make_absolute("/root", Relative));
 158   Relative[5] = '/'; // Fix up windows paths.
 159   ASSERT_EQ("/root/foo.cpp", Relative);
 160 }
 161
 162 TEST(Support, RelativePathIterator) {
 163   SmallString<64> Path(StringRef("c/d/e/foo.txt"));
 164   typedef SmallVector<StringRef, 4> PathComponents;
 165   PathComponents ExpectedPathComponents;
 166   PathComponents ActualPathComponents;
 167
 168   StringRef(Path).split(ExpectedPathComponents, '/');
 169
 170   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 171        ++I) {
 172     ActualPathComponents.push_back(*I);
 173   }
 174
 175   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 176
 177   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 178     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 179   }
 180 }
 181
 182 TEST(Support, RelativePathDotIterator) {
 183   SmallString<64> Path(StringRef(".c/.d/../."));
 184   typedef SmallVector<StringRef, 4> PathComponents;
 185   PathComponents ExpectedPathComponents;
 186   PathComponents ActualPathComponents;
 187
 188   StringRef(Path).split(ExpectedPathComponents, '/');
 189
 190   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 191        ++I) {
 192     ActualPathComponents.push_back(*I);
 193   }
 194
 195   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 196
 197   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 198     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 199   }
 200 }
 201
 202 TEST(Support, AbsolutePathIterator) {
 203   SmallString<64> Path(StringRef("/c/d/e/foo.txt"));
 204   typedef SmallVector<StringRef, 4> PathComponents;
 205   PathComponents ExpectedPathComponents;
 206   PathComponents ActualPathComponents;
 207
 208   StringRef(Path).split(ExpectedPathComponents, '/');
 209
 210   // The root path will also be a component when iterating
 211   ExpectedPathComponents[0] = "/";
 212
 213   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 214        ++I) {
 215     ActualPathComponents.push_back(*I);
 216   }
 217
 218   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 219
 220   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 221     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 222   }
 223 }
 224
 225 TEST(Support, AbsolutePathDotIterator) {
 226   SmallString<64> Path(StringRef("/.c/.d/../."));
 227   typedef SmallVector<StringRef, 4> PathComponents;
 228   PathComponents ExpectedPathComponents;
 229   PathComponents ActualPathComponents;
 230
 231   StringRef(Path).split(ExpectedPathComponents, '/');
 232
 233   // The root path will also be a component when iterating
 234   ExpectedPathComponents[0] = "/";
 235
 236   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 237        ++I) {
 238     ActualPathComponents.push_back(*I);
 239   }
 240
 241   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 242
 243   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 244     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 245   }
 246 }
 247
 248 #ifdef LLVM_ON_WIN32
 249 TEST(Support, AbsolutePathIteratorWin32) {
 250   SmallString<64> Path(StringRef("c:\\c\\e\\foo.txt"));
 251   typedef SmallVector<StringRef, 4> PathComponents;
 252   PathComponents ExpectedPathComponents;
 253   PathComponents ActualPathComponents;
 254
 255   StringRef(Path).split(ExpectedPathComponents, "\\");
 256
 257   // The root path (which comes after the drive name) will also be a component
 258   // when iterating.
 259   ExpectedPathComponents.insert(ExpectedPathComponents.begin()+1, "\\");
 260
 261   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 262        ++I) {
 263     ActualPathComponents.push_back(*I);
 264   }
 265
 266   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 267
 268   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 269     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 270   }
 271 }
 272 #endif // LLVM_ON_WIN32
 273
 274 TEST(Support, AbsolutePathIteratorEnd) {
 275   // Trailing slashes are converted to '.' unless they are part of the root path.
 276   SmallVector<StringRef, 4> Paths;
 277   Paths.push_back("/foo/");
 278   Paths.push_back("/foo//");
 279   Paths.push_back("//net//");
 280 #ifdef LLVM_ON_WIN32
 281   Paths.push_back("c:\\\\");
 282 #endif
 283
 284   for (StringRef Path : Paths) {
 285     StringRef LastComponent = *path::rbegin(Path);
 286     EXPECT_EQ(".", LastComponent);
 287   }
 288
 289   SmallVector<StringRef, 3> RootPaths;
 290   RootPaths.push_back("/");
 291   RootPaths.push_back("//net/");
 292 #ifdef LLVM_ON_WIN32
 293   RootPaths.push_back("c:\\");
 294 #endif
 295
 296   for (StringRef Path : RootPaths) {
 297     StringRef LastComponent = *path::rbegin(Path);
 298     EXPECT_EQ(1u, LastComponent.size());
 299     EXPECT_TRUE(path::is_separator(LastComponent[0]));
 300   }
 301 }
 302
 303 TEST(Support, HomeDirectory) {
 304   std::string expected;
 305 #ifdef LLVM_ON_WIN32
 306   if (wchar_t const *path = ::_wgetenv(L"USERPROFILE")) {
 307     auto pathLen = ::wcslen(path);
 308     ArrayRef<char> ref{reinterpret_cast<char const *>(path),
 309                        pathLen * sizeof(wchar_t)};
 310     convertUTF16ToUTF8String(ref, expected);
 311   }
 312 #else
 313   if (char const *path = ::getenv("HOME"))
 314     expected = path;
 315 #endif
 316   // Do not try to test it if we don't know what to expect.
 317   // On Windows we use something better than env vars.
 318   if (!expected.empty()) {
 319     SmallString<128> HomeDir;
 320     auto status = path::home_directory(HomeDir);
 321     EXPECT_TRUE(status);
 322     EXPECT_EQ(expected, HomeDir);
 323   }
 324 }
 325
 326 TEST(Support, UserCacheDirectory) {
 327   SmallString<13> CacheDir;
 328   SmallString<20> CacheDir2;
 329   auto Status = path::user_cache_directory(CacheDir, "");
 330   EXPECT_TRUE(Status ^ CacheDir.empty());
 331
 332   if (Status) {
 333     EXPECT_TRUE(path::user_cache_directory(CacheDir2, "")); // should succeed
 334     EXPECT_EQ(CacheDir, CacheDir2); // and return same paths
 335
 336     EXPECT_TRUE(path::user_cache_directory(CacheDir, "A", "B", "file.c"));
 337     auto It = path::rbegin(CacheDir);
 338     EXPECT_EQ("file.c", *It);
 339     EXPECT_EQ("B", *++It);
 340     EXPECT_EQ("A", *++It);
 341     auto ParentDir = *++It;
 342
 343     // Test Unicode: "<user_cache_dir>/(pi)r^2/aleth.0"
 344     EXPECT_TRUE(path::user_cache_directory(CacheDir2, "\xCF\x80r\xC2\xB2",
 345                                            "\xE2\x84\xB5.0"));
 346     auto It2 = path::rbegin(CacheDir2);
 347     EXPECT_EQ("\xE2\x84\xB5.0", *It2);
 348     EXPECT_EQ("\xCF\x80r\xC2\xB2", *++It2);
 349     auto ParentDir2 = *++It2;
 350
 351     EXPECT_EQ(ParentDir, ParentDir2);
 352   }
 353 }
 354
 355 TEST(Support, TempDirectory) {
 356   SmallString<32> TempDir;
 357   path::system_temp_directory(false, TempDir);
 358   EXPECT_TRUE(!TempDir.empty());
 359   TempDir.clear();
 360   path::system_temp_directory(true, TempDir);
 361   EXPECT_TRUE(!TempDir.empty());
 362 }
 363
 364 #ifdef LLVM_ON_WIN32
 365 static std::string path2regex(std::string Path) {
 366   size_t Pos = 0;
 367   while ((Pos = Path.find('\\', Pos)) != std::string::npos) {
 368     Path.replace(Pos, 1, "\\\\");
 369     Pos += 2;
 370   }
 371   return Path;
 372 }
 373
 374 /// Helper for running temp dir test in separated process. See below.
 375 #define EXPECT_TEMP_DIR(prepare, expected)                                     \
 376   EXPECT_EXIT(                                                                 \
 377       {                                                                        \
 378         prepare;                                                               \
 379         SmallString<300> TempDir;                                              \
 380         path::system_temp_directory(true, TempDir);                            \
 381         raw_os_ostream(std::cerr) << TempDir;                                  \
 382         std::exit(0);                                                          \
 383       },                                                                       \
 384       ::testing::ExitedWithCode(0), path2regex(expected))
 385
 386 TEST(SupportDeathTest, TempDirectoryOnWindows) {
 387   // In this test we want to check how system_temp_directory responds to
 388   // different values of specific env vars. To prevent corrupting env vars of
 389   // the current process all checks are done in separated processes.
 390   EXPECT_TEMP_DIR(_wputenv_s(L"TMP", L"C:\\OtherFolder"), "C:\\OtherFolder");
 391   EXPECT_TEMP_DIR(_wputenv_s(L"TMP", L"C:/Unix/Path/Seperators"),
 392                   "C:\\Unix\\Path\\Seperators");
 393   EXPECT_TEMP_DIR(_wputenv_s(L"TMP", L"Local Path"), ".+\\Local Path$");
 394   EXPECT_TEMP_DIR(_wputenv_s(L"TMP", L"F:\\TrailingSep\\"), "F:\\TrailingSep");
 395   EXPECT_TEMP_DIR(
 396       _wputenv_s(L"TMP", L"C:\\2\x03C0r-\x00B5\x00B3\\\x2135\x2080"),
 397       "C:\\2\xCF\x80r-\xC2\xB5\xC2\xB3\\\xE2\x84\xB5\xE2\x82\x80");
 398
 399   // Test $TMP empty, $TEMP set.
 400   EXPECT_TEMP_DIR(
 401       {
 402         _wputenv_s(L"TMP", L"");
 403         _wputenv_s(L"TEMP", L"C:\\Valid\\Path");
 404       },
 405       "C:\\Valid\\Path");
 406
 407   // All related env vars empty
 408   EXPECT_TEMP_DIR(
 409   {
 410     _wputenv_s(L"TMP", L"");
 411     _wputenv_s(L"TEMP", L"");
 412     _wputenv_s(L"USERPROFILE", L"");
 413   },
 414     "C:\\Temp");
 415
 416   // Test evn var / path with 260 chars.
 417   SmallString<270> Expected{"C:\\Temp\\AB\\123456789"};
 418   while (Expected.size() < 260)
 419     Expected.append("\\DirNameWith19Charss");
 420   ASSERT_EQ(260U, Expected.size());
 421   EXPECT_TEMP_DIR(_putenv_s("TMP", Expected.c_str()), Expected.c_str());
 422 }
 423 #endif
 424
 425 class FileSystemTest : public testing::Test {
 426 protected:
 427   /// Unique temporary directory in which all created filesystem entities must
 428   /// be placed. It is removed at the end of each test (must be empty).
 429   SmallString<128> TestDirectory;
 430
 431   void SetUp() override {
 432     ASSERT_NO_ERROR(
 433         fs::createUniqueDirectory("file-system-test", TestDirectory));
 434     // We don't care about this specific file.
 435     errs() << "Test Directory: " << TestDirectory << '\n';
 436     errs().flush();
 437   }
 438
 439   void TearDown() override { ASSERT_NO_ERROR(fs::remove(TestDirectory.str())); }
 440 };
 441
 442 TEST_F(FileSystemTest, Unique) {
 443   // Create a temp file.
 444   int FileDescriptor;
 445   SmallString<64> TempPath;
 446   ASSERT_NO_ERROR(
 447       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 448
 449   // The same file should return an identical unique id.
 450   fs::UniqueID F1, F2;
 451   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), F1));
 452   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), F2));
 453   ASSERT_EQ(F1, F2);
 454
 455   // Different files should return different unique ids.
 456   int FileDescriptor2;
 457   SmallString<64> TempPath2;
 458   ASSERT_NO_ERROR(
 459       fs::createTemporaryFile("prefix", "temp", FileDescriptor2, TempPath2));
 460
 461   fs::UniqueID D;
 462   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath2), D));
 463   ASSERT_NE(D, F1);
 464   ::close(FileDescriptor2);
 465
 466   ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
 467
 468   // Two paths representing the same file on disk should still provide the
 469   // same unique id.  We can test this by making a hard link.
 470   ASSERT_NO_ERROR(fs::create_link(Twine(TempPath), Twine(TempPath2)));
 471   fs::UniqueID D2;
 472   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath2), D2));
 473   ASSERT_EQ(D2, F1);
 474
 475   ::close(FileDescriptor);
 476
 477   SmallString<128> Dir1;
 478   ASSERT_NO_ERROR(
 479      fs::createUniqueDirectory("dir1", Dir1));
 480   ASSERT_NO_ERROR(fs::getUniqueID(Dir1.c_str(), F1));
 481   ASSERT_NO_ERROR(fs::getUniqueID(Dir1.c_str(), F2));
 482   ASSERT_EQ(F1, F2);
 483
 484   SmallString<128> Dir2;
 485   ASSERT_NO_ERROR(
 486      fs::createUniqueDirectory("dir2", Dir2));
 487   ASSERT_NO_ERROR(fs::getUniqueID(Dir2.c_str(), F2));
 488   ASSERT_NE(F1, F2);
 489 }
 490
 491 TEST_F(FileSystemTest, TempFiles) {
 492   // Create a temp file.
 493   int FileDescriptor;
 494   SmallString<64> TempPath;
 495   ASSERT_NO_ERROR(
 496       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 497
 498   // Make sure it exists.
 499   ASSERT_TRUE(sys::fs::exists(Twine(TempPath)));
 500
 501   // Create another temp tile.
 502   int FD2;
 503   SmallString<64> TempPath2;
 504   ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "temp", FD2, TempPath2));
 505   ASSERT_TRUE(TempPath2.endswith(".temp"));
 506   ASSERT_NE(TempPath.str(), TempPath2.str());
 507
 508   fs::file_status A, B;
 509   ASSERT_NO_ERROR(fs::status(Twine(TempPath), A));
 510   ASSERT_NO_ERROR(fs::status(Twine(TempPath2), B));
 511   EXPECT_FALSE(fs::equivalent(A, B));
 512
 513   ::close(FD2);
 514
 515   // Remove Temp2.
 516   ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
 517   ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
 518   ASSERT_EQ(fs::remove(Twine(TempPath2), false),
 519             errc::no_such_file_or_directory);
 520
 521   std::error_code EC = fs::status(TempPath2.c_str(), B);
 522   EXPECT_EQ(EC, errc::no_such_file_or_directory);
 523   EXPECT_EQ(B.type(), fs::file_type::file_not_found);
 524
 525   // Make sure Temp2 doesn't exist.
 526   ASSERT_EQ(fs::access(Twine(TempPath2), sys::fs::AccessMode::Exist),
 527             errc::no_such_file_or_directory);
 528
 529   SmallString<64> TempPath3;
 530   ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "", TempPath3));
 531   ASSERT_FALSE(TempPath3.endswith("."));
 532
 533   // Create a hard link to Temp1.
 534   ASSERT_NO_ERROR(fs::create_link(Twine(TempPath), Twine(TempPath2)));
 535   bool equal;
 536   ASSERT_NO_ERROR(fs::equivalent(Twine(TempPath), Twine(TempPath2), equal));
 537   EXPECT_TRUE(equal);
 538   ASSERT_NO_ERROR(fs::status(Twine(TempPath), A));
 539   ASSERT_NO_ERROR(fs::status(Twine(TempPath2), B));
 540   EXPECT_TRUE(fs::equivalent(A, B));
 541
 542   // Remove Temp1.
 543   ::close(FileDescriptor);
 544   ASSERT_NO_ERROR(fs::remove(Twine(TempPath)));
 545
 546   // Remove the hard link.
 547   ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
 548
 549   // Make sure Temp1 doesn't exist.
 550   ASSERT_EQ(fs::access(Twine(TempPath), sys::fs::AccessMode::Exist),
 551             errc::no_such_file_or_directory);
 552
 553 #ifdef LLVM_ON_WIN32
 554   // Path name > 260 chars should get an error.
 555   const char *Path270 =
 556     "abcdefghijklmnopqrstuvwxyz9abcdefghijklmnopqrstuvwxyz8"
 557     "abcdefghijklmnopqrstuvwxyz7abcdefghijklmnopqrstuvwxyz6"
 558     "abcdefghijklmnopqrstuvwxyz5abcdefghijklmnopqrstuvwxyz4"
 559     "abcdefghijklmnopqrstuvwxyz3abcdefghijklmnopqrstuvwxyz2"
 560     "abcdefghijklmnopqrstuvwxyz1abcdefghijklmnopqrstuvwxyz0";
 561   EXPECT_EQ(fs::createUniqueFile(Path270, FileDescriptor, TempPath),
 562             errc::invalid_argument);
 563   // Relative path < 247 chars, no problem.
 564   const char *Path216 =
 565     "abcdefghijklmnopqrstuvwxyz7abcdefghijklmnopqrstuvwxyz6"
 566     "abcdefghijklmnopqrstuvwxyz5abcdefghijklmnopqrstuvwxyz4"
 567     "abcdefghijklmnopqrstuvwxyz3abcdefghijklmnopqrstuvwxyz2"
 568     "abcdefghijklmnopqrstuvwxyz1abcdefghijklmnopqrstuvwxyz0";
 569   ASSERT_NO_ERROR(fs::createTemporaryFile(Path216, "", TempPath));
 570   ASSERT_NO_ERROR(fs::remove(Twine(TempPath)));
 571 #endif
 572 }
 573
 574 TEST_F(FileSystemTest, CreateDir) {
 575   ASSERT_NO_ERROR(fs::create_directory(Twine(TestDirectory) + "foo"));
 576   ASSERT_NO_ERROR(fs::create_directory(Twine(TestDirectory) + "foo"));
 577   ASSERT_EQ(fs::create_directory(Twine(TestDirectory) + "foo", false),
 578             errc::file_exists);
 579   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "foo"));
 580
 581 #ifdef LLVM_ON_UNIX
 582   // Set a 0000 umask so that we can test our directory permissions.
 583   mode_t OldUmask = ::umask(0000);
 584
 585   fs::file_status Status;
 586   ASSERT_NO_ERROR(
 587       fs::create_directory(Twine(TestDirectory) + "baz500", false,
 588                            fs::perms::owner_read | fs::perms::owner_exe));
 589   ASSERT_NO_ERROR(fs::status(Twine(TestDirectory) + "baz500", Status));
 590   ASSERT_EQ(Status.permissions() & fs::perms::all_all,
 591             fs::perms::owner_read | fs::perms::owner_exe);
 592   ASSERT_NO_ERROR(fs::create_directory(Twine(TestDirectory) + "baz777", false,
 593                                        fs::perms::all_all));
 594   ASSERT_NO_ERROR(fs::status(Twine(TestDirectory) + "baz777", Status));
 595   ASSERT_EQ(Status.permissions() & fs::perms::all_all, fs::perms::all_all);
 596
 597   // Restore umask to be safe.
 598   ::umask(OldUmask);
 599 #endif
 600
 601 #ifdef LLVM_ON_WIN32
 602   // Prove that create_directories() can handle a pathname > 248 characters,
 603   // which is the documented limit for CreateDirectory().
 604   // (248 is MAX_PATH subtracting room for an 8.3 filename.)
 605   // Generate a directory path guaranteed to fall into that range.
 606   size_t TmpLen = TestDirectory.size();
 607   const char *OneDir = "\\123456789";
 608   size_t OneDirLen = strlen(OneDir);
 609   ASSERT_LT(OneDirLen, 12U);
 610   size_t NLevels = ((248 - TmpLen) / OneDirLen) + 1;
 611   SmallString<260> LongDir(TestDirectory);
 612   for (size_t I = 0; I < NLevels; ++I)
 613     LongDir.append(OneDir);
 614   ASSERT_NO_ERROR(fs::create_directories(Twine(LongDir)));
 615   ASSERT_NO_ERROR(fs::create_directories(Twine(LongDir)));
 616   ASSERT_EQ(fs::create_directories(Twine(LongDir), false),
 617             errc::file_exists);
 618   // Tidy up, "recursively" removing the directories.
 619   StringRef ThisDir(LongDir);
 620   for (size_t J = 0; J < NLevels; ++J) {
 621     ASSERT_NO_ERROR(fs::remove(ThisDir));
 622     ThisDir = path::parent_path(ThisDir);
 623   }
 624
 625   // Similarly for a relative pathname.  Need to set the current directory to
 626   // TestDirectory so that the one we create ends up in the right place.
 627   char PreviousDir[260];
 628   size_t PreviousDirLen = ::GetCurrentDirectoryA(260, PreviousDir);
 629   ASSERT_GT(PreviousDirLen, 0U);
 630   ASSERT_LT(PreviousDirLen, 260U);
 631   ASSERT_NE(::SetCurrentDirectoryA(TestDirectory.c_str()), 0);
 632   LongDir.clear();
 633   // Generate a relative directory name with absolute length > 248.
 634   size_t LongDirLen = 249 - TestDirectory.size();
 635   LongDir.assign(LongDirLen, 'a');
 636   ASSERT_NO_ERROR(fs::create_directory(Twine(LongDir)));
 637   // While we're here, prove that .. and . handling works in these long paths.
 638   const char *DotDotDirs = "\\..\\.\\b";
 639   LongDir.append(DotDotDirs);
 640   ASSERT_NO_ERROR(fs::create_directory("b"));
 641   ASSERT_EQ(fs::create_directory(Twine(LongDir), false), errc::file_exists);
 642   // And clean up.
 643   ASSERT_NO_ERROR(fs::remove("b"));
 644   ASSERT_NO_ERROR(fs::remove(
 645     Twine(LongDir.substr(0, LongDir.size() - strlen(DotDotDirs)))));
 646   ASSERT_NE(::SetCurrentDirectoryA(PreviousDir), 0);
 647 #endif
 648 }
 649
 650 TEST_F(FileSystemTest, DirectoryIteration) {
 651   std::error_code ec;
 652   for (fs::directory_iterator i(".", ec), e; i != e; i.increment(ec))
 653     ASSERT_NO_ERROR(ec);
 654
 655   // Create a known hierarchy to recurse over.
 656   ASSERT_NO_ERROR(
 657       fs::create_directories(Twine(TestDirectory) + "/recursive/a0/aa1"));
 658   ASSERT_NO_ERROR(
 659       fs::create_directories(Twine(TestDirectory) + "/recursive/a0/ab1"));
 660   ASSERT_NO_ERROR(fs::create_directories(Twine(TestDirectory) +
 661                                          "/recursive/dontlookhere/da1"));
 662   ASSERT_NO_ERROR(
 663       fs::create_directories(Twine(TestDirectory) + "/recursive/z0/za1"));
 664   ASSERT_NO_ERROR(
 665       fs::create_directories(Twine(TestDirectory) + "/recursive/pop/p1"));
 666   typedef std::vector<std::string> v_t;
 667   v_t visited;
 668   for (fs::recursive_directory_iterator i(Twine(TestDirectory)
 669          + "/recursive", ec), e; i != e; i.increment(ec)){
 670     ASSERT_NO_ERROR(ec);
 671     if (path::filename(i->path()) == "p1") {
 672       i.pop();
 673       // FIXME: recursive_directory_iterator should be more robust.
 674       if (i == e) break;
 675     }
 676     if (path::filename(i->path()) == "dontlookhere")
 677       i.no_push();
 678     visited.push_back(path::filename(i->path()));
 679   }
 680   v_t::const_iterator a0 = std::find(visited.begin(), visited.end(), "a0");
 681   v_t::const_iterator aa1 = std::find(visited.begin(), visited.end(), "aa1");
 682   v_t::const_iterator ab1 = std::find(visited.begin(), visited.end(), "ab1");
 683   v_t::const_iterator dontlookhere = std::find(visited.begin(), visited.end(),
 684                                                "dontlookhere");
 685   v_t::const_iterator da1 = std::find(visited.begin(), visited.end(), "da1");
 686   v_t::const_iterator z0 = std::find(visited.begin(), visited.end(), "z0");
 687   v_t::const_iterator za1 = std::find(visited.begin(), visited.end(), "za1");
 688   v_t::const_iterator pop = std::find(visited.begin(), visited.end(), "pop");
 689   v_t::const_iterator p1 = std::find(visited.begin(), visited.end(), "p1");
 690
 691   // Make sure that each path was visited correctly.
 692   ASSERT_NE(a0, visited.end());
 693   ASSERT_NE(aa1, visited.end());
 694   ASSERT_NE(ab1, visited.end());
 695   ASSERT_NE(dontlookhere, visited.end());
 696   ASSERT_EQ(da1, visited.end()); // Not visited.
 697   ASSERT_NE(z0, visited.end());
 698   ASSERT_NE(za1, visited.end());
 699   ASSERT_NE(pop, visited.end());
 700   ASSERT_EQ(p1, visited.end()); // Not visited.
 701
 702   // Make sure that parents were visited before children. No other ordering
 703   // guarantees can be made across siblings.
 704   ASSERT_LT(a0, aa1);
 705   ASSERT_LT(a0, ab1);
 706   ASSERT_LT(z0, za1);
 707
 708   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0/aa1"));
 709   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0/ab1"));
 710   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0"));
 711   ASSERT_NO_ERROR(
 712       fs::remove(Twine(TestDirectory) + "/recursive/dontlookhere/da1"));
 713   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/dontlookhere"));
 714   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/pop/p1"));
 715   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/pop"));
 716   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/z0/za1"));
 717   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/z0"));
 718   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive"));
 719
 720   // Test recursive_directory_iterator level()
 721   ASSERT_NO_ERROR(
 722       fs::create_directories(Twine(TestDirectory) + "/reclevel/a/b/c"));
 723   fs::recursive_directory_iterator I(Twine(TestDirectory) + "/reclevel", ec), E;
 724   for (int l = 0; I != E; I.increment(ec), ++l) {
 725     ASSERT_NO_ERROR(ec);
 726     EXPECT_EQ(I.level(), l);
 727   }
 728   EXPECT_EQ(I, E);
 729   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/reclevel/a/b/c"));
 730   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/reclevel/a/b"));
 731   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/reclevel/a"));
 732   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/reclevel"));
 733 }
 734
 735 const char archive[] = "!<arch>\x0A";
 736 const char bitcode[] = "\xde\xc0\x17\x0b";
 737 const char coff_object[] = "\x00\x00......";
 738 const char coff_bigobj[] = "\x00\x00\xff\xff\x00\x02......"
 739     "\xc7\xa1\xba\xd1\xee\xba\xa9\x4b\xaf\x20\xfa\xf6\x6a\xa4\xdc\xb8";
 740 const char coff_import_library[] = "\x00\x00\xff\xff....";
 741 const char elf_relocatable[] = { 0x7f, 'E', 'L', 'F', 1, 2, 1, 0, 0,
 742                                  0,    0,   0,   0,   0, 0, 0, 0, 1 };
 743 const char macho_universal_binary[] = "\xca\xfe\xba\xbe...\x00";
 744 const char macho_object[] =
 745     "\xfe\xed\xfa\xce........\x00\x00\x00\x01............";
 746 const char macho_executable[] =
 747     "\xfe\xed\xfa\xce........\x00\x00\x00\x02............";
 748 const char macho_fixed_virtual_memory_shared_lib[] =
 749     "\xfe\xed\xfa\xce........\x00\x00\x00\x03............";
 750 const char macho_core[] =
 751     "\xfe\xed\xfa\xce........\x00\x00\x00\x04............";
 752 const char macho_preload_executable[] =
 753     "\xfe\xed\xfa\xce........\x00\x00\x00\x05............";
 754 const char macho_dynamically_linked_shared_lib[] =
 755     "\xfe\xed\xfa\xce........\x00\x00\x00\x06............";
 756 const char macho_dynamic_linker[] =
 757     "\xfe\xed\xfa\xce........\x00\x00\x00\x07............";
 758 const char macho_bundle[] =
 759     "\xfe\xed\xfa\xce........\x00\x00\x00\x08............";
 760 const char macho_dsym_companion[] =
 761     "\xfe\xed\xfa\xce........\x00\x00\x00\x0a............";
 762 const char macho_kext_bundle[] =
 763     "\xfe\xed\xfa\xce........\x00\x00\x00\x0b............";
 764 const char windows_resource[] = "\x00\x00\x00\x00\x020\x00\x00\x00\xff";
 765 const char macho_dynamically_linked_shared_lib_stub[] =
 766     "\xfe\xed\xfa\xce........\x00\x00\x00\x09............";
 767
 768 TEST_F(FileSystemTest, Magic) {
 769   struct type {
 770     const char *filename;
 771     const char *magic_str;
 772     size_t magic_str_len;
 773     fs::file_magic magic;
 774   } types[] = {
 775 #define DEFINE(magic)                                           \
 776     { #magic, magic, sizeof(magic), fs::file_magic::magic }
 777     DEFINE(archive),
 778     DEFINE(bitcode),
 779     DEFINE(coff_object),
 780     { "coff_bigobj", coff_bigobj, sizeof(coff_bigobj), fs::file_magic::coff_object },
 781     DEFINE(coff_import_library),
 782     DEFINE(elf_relocatable),
 783     DEFINE(macho_universal_binary),
 784     DEFINE(macho_object),
 785     DEFINE(macho_executable),
 786     DEFINE(macho_fixed_virtual_memory_shared_lib),
 787     DEFINE(macho_core),
 788     DEFINE(macho_preload_executable),
 789     DEFINE(macho_dynamically_linked_shared_lib),
 790     DEFINE(macho_dynamic_linker),
 791     DEFINE(macho_bundle),
 792     DEFINE(macho_dynamically_linked_shared_lib_stub),
 793     DEFINE(macho_dsym_companion),
 794     DEFINE(macho_kext_bundle),
 795     DEFINE(windows_resource)
 796 #undef DEFINE
 797     };
 798
 799   // Create some files filled with magic.
 800   for (type *i = types, *e = types + (sizeof(types) / sizeof(type)); i != e;
 801                                                                      ++i) {
 802     SmallString<128> file_pathname(TestDirectory);
 803     path::append(file_pathname, i->filename);
 804     std::error_code EC;
 805     raw_fd_ostream file(file_pathname, EC, sys::fs::F_None);
 806     ASSERT_FALSE(file.has_error());
 807     StringRef magic(i->magic_str, i->magic_str_len);
 808     file << magic;
 809     file.close();
 810     EXPECT_EQ(i->magic, fs::identify_magic(magic));
 811     ASSERT_NO_ERROR(fs::remove(Twine(file_pathname)));
 812   }
 813 }
 814
 815 #ifdef LLVM_ON_WIN32
 816 TEST_F(FileSystemTest, CarriageReturn) {
 817   SmallString<128> FilePathname(TestDirectory);
 818   std::error_code EC;
 819   path::append(FilePathname, "test");
 820
 821   {
 822     raw_fd_ostream File(FilePathname, EC, sys::fs::F_Text);
 823     ASSERT_NO_ERROR(EC);
 824     File << '\n';
 825   }
 826   {
 827     auto Buf = MemoryBuffer::getFile(FilePathname.str());
 828     EXPECT_TRUE((bool)Buf);
 829     EXPECT_EQ(Buf.get()->getBuffer(), "\r\n");
 830   }
 831
 832   {
 833     raw_fd_ostream File(FilePathname, EC, sys::fs::F_None);
 834     ASSERT_NO_ERROR(EC);
 835     File << '\n';
 836   }
 837   {
 838     auto Buf = MemoryBuffer::getFile(FilePathname.str());
 839     EXPECT_TRUE((bool)Buf);
 840     EXPECT_EQ(Buf.get()->getBuffer(), "\n");
 841   }
 842   ASSERT_NO_ERROR(fs::remove(Twine(FilePathname)));
 843 }
 844 #endif
 845
 846 TEST_F(FileSystemTest, Resize) {
 847   int FD;
 848   SmallString<64> TempPath;
 849   ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "temp", FD, TempPath));
 850   ASSERT_NO_ERROR(fs::resize_file(FD, 123));
 851   fs::file_status Status;
 852   ASSERT_NO_ERROR(fs::status(FD, Status));
 853   ASSERT_EQ(Status.getSize(), 123U);
 854 }
 855
 856 TEST_F(FileSystemTest, FileMapping) {
 857   // Create a temp file.
 858   int FileDescriptor;
 859   SmallString<64> TempPath;
 860   ASSERT_NO_ERROR(
 861       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 862   unsigned Size = 4096;
 863   ASSERT_NO_ERROR(fs::resize_file(FileDescriptor, Size));
 864
 865   // Map in temp file and add some content
 866   std::error_code EC;
 867   StringRef Val("hello there");
 868   {
 869     fs::mapped_file_region mfr(FileDescriptor,
 870                                fs::mapped_file_region::readwrite, Size, 0, EC);
 871     ASSERT_NO_ERROR(EC);
 872     std::copy(Val.begin(), Val.end(), mfr.data());
 873     // Explicitly add a 0.
 874     mfr.data()[Val.size()] = 0;
 875     // Unmap temp file
 876   }
 877
 878   // Map it back in read-only
 879   int FD;
 880   EC = fs::openFileForRead(Twine(TempPath), FD);
 881   ASSERT_NO_ERROR(EC);
 882   fs::mapped_file_region mfr(FD, fs::mapped_file_region::readonly, Size, 0, EC);
 883   ASSERT_NO_ERROR(EC);
 884
 885   // Verify content
 886   EXPECT_EQ(StringRef(mfr.const_data()), Val);
 887
 888   // Unmap temp file
 889   fs::mapped_file_region m(FD, fs::mapped_file_region::readonly, Size, 0, EC);
 890   ASSERT_NO_ERROR(EC);
 891   ASSERT_EQ(close(FD), 0);
 892 }
 893
 894 TEST(Support, NormalizePath) {
 895 #if defined(LLVM_ON_WIN32)
 896 #define EXPECT_PATH_IS(path__, windows__, not_windows__)                        \
 897   EXPECT_EQ(path__, windows__);
 898 #else
 899 #define EXPECT_PATH_IS(path__, windows__, not_windows__)                        \
 900   EXPECT_EQ(path__, not_windows__);
 901 #endif
 902
 903   SmallString<64> Path1("a");
 904   SmallString<64> Path2("a/b");
 905   SmallString<64> Path3("a\\b");
 906   SmallString<64> Path4("a\\\\b");
 907   SmallString<64> Path5("\\a");
 908   SmallString<64> Path6("a\\");
 909
 910   path::native(Path1);
 911   EXPECT_PATH_IS(Path1, "a", "a");
 912
 913   path::native(Path2);
 914   EXPECT_PATH_IS(Path2, "a\\b", "a/b");
 915
 916   path::native(Path3);
 917   EXPECT_PATH_IS(Path3, "a\\b", "a/b");
 918
 919   path::native(Path4);
 920   EXPECT_PATH_IS(Path4, "a\\\\b", "a\\\\b");
 921
 922   path::native(Path5);
 923   EXPECT_PATH_IS(Path5, "\\a", "/a");
 924
 925   path::native(Path6);
 926   EXPECT_PATH_IS(Path6, "a\\", "a/");
 927
 928 #undef EXPECT_PATH_IS
 929 }
 930
 931 TEST(Support, RemoveLeadingDotSlash) {
 932   StringRef Path1("././/foolz/wat");
 933   StringRef Path2("./////");
 934
 935   Path1 = path::remove_leading_dotslash(Path1);
 936   EXPECT_EQ(Path1, "foolz/wat");
 937   Path2 = path::remove_leading_dotslash(Path2);
 938   EXPECT_EQ(Path2, "");
 939 }
 940
 941 static std::string remove_dots(StringRef path,
 942     bool remove_dot_dot) {
 943   SmallString<256> buffer(path);
 944   path::remove_dots(buffer, remove_dot_dot);
 945   return buffer.str();
 946 }
 947
 948 TEST(Support, RemoveDots) {
 949 #if defined(LLVM_ON_WIN32)
 950   EXPECT_EQ("foolz\\wat", remove_dots(".\\.\\\\foolz\\wat", false));
 951   EXPECT_EQ("", remove_dots(".\\\\\\\\\\", false));
 952
 953   EXPECT_EQ("a\\..\\b\\c", remove_dots(".\\a\\..\\b\\c", false));
 954   EXPECT_EQ("b\\c", remove_dots(".\\a\\..\\b\\c", true));
 955   EXPECT_EQ("c", remove_dots(".\\.\\c", true));
 956
 957   SmallString<64> Path1(".\\.\\c");
 958   EXPECT_TRUE(path::remove_dots(Path1, true));
 959   EXPECT_EQ("c", Path1);
 960 #else
 961   EXPECT_EQ("foolz/wat", remove_dots("././/foolz/wat", false));
 962   EXPECT_EQ("", remove_dots("./////", false));
 963
 964   EXPECT_EQ("a/../b/c", remove_dots("./a/../b/c", false));
 965   EXPECT_EQ("b/c", remove_dots("./a/../b/c", true));
 966   EXPECT_EQ("c", remove_dots("././c", true));
 967
 968   SmallString<64> Path1("././c");
 969   EXPECT_TRUE(path::remove_dots(Path1, true));
 970   EXPECT_EQ("c", Path1);
 971 #endif
 972 }
 973
 974 TEST(Support, ReplacePathPrefix) {
 975   SmallString<64> Path1("/foo");
 976   SmallString<64> Path2("/old/foo");
 977   SmallString<64> OldPrefix("/old");
 978   SmallString<64> NewPrefix("/new");
 979   SmallString<64> NewPrefix2("/longernew");
 980   SmallString<64> EmptyPrefix("");
 981
 982   SmallString<64> Path = Path1;
 983   path::replace_path_prefix(Path, OldPrefix, NewPrefix);
 984   EXPECT_EQ(Path, "/foo");
 985   Path = Path2;
 986   path::replace_path_prefix(Path, OldPrefix, NewPrefix);
 987   EXPECT_EQ(Path, "/new/foo");
 988   Path = Path2;
 989   path::replace_path_prefix(Path, OldPrefix, NewPrefix2);
 990   EXPECT_EQ(Path, "/longernew/foo");
 991   Path = Path1;
 992   path::replace_path_prefix(Path, EmptyPrefix, NewPrefix);
 993   EXPECT_EQ(Path, "/new/foo");
 994   Path = Path2;
 995   path::replace_path_prefix(Path, OldPrefix, EmptyPrefix);
 996   EXPECT_EQ(Path, "/foo");
 997 }
 998
 999 TEST_F(FileSystemTest, PathFromFD) {
1000   // Create a temp file.
1001   int FileDescriptor;
1002   SmallString<64> TempPath;
1003   ASSERT_NO_ERROR(
1004       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
1005
1006   // Make sure it exists.
1007   ASSERT_TRUE(sys::fs::exists(Twine(TempPath)));
1008
1009   // Try to get the path from the file descriptor
1010   SmallString<64> ResultPath;
1011   std::error_code ErrorCode =
1012       fs::getPathFromOpenFD(FileDescriptor, ResultPath);
1013
1014   // If we succeeded, check that the paths are the same (modulo case):
1015   if (!ErrorCode) {
1016     // The paths returned by createTemporaryFile and getPathFromOpenFD
1017     // should reference the same file on disk.
1018     fs::UniqueID D1, D2;
1019     ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), D1));
1020     ASSERT_NO_ERROR(fs::getUniqueID(Twine(ResultPath), D2));
1021     ASSERT_EQ(D1, D2);
1022   }
1023
1024   ::close(FileDescriptor);
1025 }
1026
1027 TEST_F(FileSystemTest, OpenFileForRead) {
1028   // Create a temp file.
1029   int FileDescriptor;
1030   SmallString<64> TempPath;
1031   ASSERT_NO_ERROR(
1032       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
1033
1034   // Make sure it exists.
1035   ASSERT_TRUE(sys::fs::exists(Twine(TempPath)));
1036
1037   // Open the file for read
1038   int FileDescriptor2;
1039   SmallString<64> ResultPath;
1040   ASSERT_NO_ERROR(
1041       fs::openFileForRead(Twine(TempPath), FileDescriptor2, &ResultPath))
1042
1043   // If we succeeded, check that the paths are the same (modulo case):
1044   if (!ResultPath.empty()) {
1045     // The paths returned by createTemporaryFile and getPathFromOpenFD
1046     // should reference the same file on disk.
1047     fs::UniqueID D1, D2;
1048     ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), D1));
1049     ASSERT_NO_ERROR(fs::getUniqueID(Twine(ResultPath), D2));
1050     ASSERT_EQ(D1, D2);
1051   }
1052
1053   ::close(FileDescriptor);
1054 }
1055 } // anonymous namespace