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/ErrorHandling.h"
  12 #include "llvm/Support/FileSystem.h"
  13 #include "llvm/Support/MemoryBuffer.h"
  14 #include "llvm/Support/raw_ostream.h"
  15 #include "gtest/gtest.h"
  16
  17 using namespace llvm;
  18 using namespace llvm::sys;
  19
  20 #define ASSERT_NO_ERROR(x) \
  21   if (error_code ASSERT_NO_ERROR_ec = x) { \
  22     SmallString<128> MessageStorage; \
  23     raw_svector_ostream Message(MessageStorage); \
  24     Message << #x ": did not return errc::success.\n" \
  25             << "error number: " << ASSERT_NO_ERROR_ec.value() << "\n" \
  26             << "error message: " << ASSERT_NO_ERROR_ec.message() << "\n"; \
  27     GTEST_FATAL_FAILURE_(MessageStorage.c_str()); \
  28   } else {}
  29
  30 namespace {
  31
  32 TEST(is_separator, Works) {
  33   EXPECT_TRUE(path::is_separator('/'));
  34   EXPECT_FALSE(path::is_separator('\0'));
  35   EXPECT_FALSE(path::is_separator('-'));
  36   EXPECT_FALSE(path::is_separator(' '));
  37
  38 #ifdef LLVM_ON_WIN32
  39   EXPECT_TRUE(path::is_separator('\\'));
  40 #else
  41   EXPECT_FALSE(path::is_separator('\\'));
  42 #endif
  43 }
  44
  45 TEST(Support, Path) {
  46   SmallVector<StringRef, 40> paths;
  47   paths.push_back("");
  48   paths.push_back(".");
  49   paths.push_back("..");
  50   paths.push_back("foo");
  51   paths.push_back("/");
  52   paths.push_back("/foo");
  53   paths.push_back("foo/");
  54   paths.push_back("/foo/");
  55   paths.push_back("foo/bar");
  56   paths.push_back("/foo/bar");
  57   paths.push_back("//net");
  58   paths.push_back("//net/foo");
  59   paths.push_back("///foo///");
  60   paths.push_back("///foo///bar");
  61   paths.push_back("/.");
  62   paths.push_back("./");
  63   paths.push_back("/..");
  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/..");
  70   paths.push_back("foo/../");
  71   paths.push_back("foo/../bar");
  72   paths.push_back("c:");
  73   paths.push_back("c:/");
  74   paths.push_back("c:foo");
  75   paths.push_back("c:/foo");
  76   paths.push_back("c:foo/");
  77   paths.push_back("c:/foo/");
  78   paths.push_back("c:/foo/bar");
  79   paths.push_back("prn:");
  80   paths.push_back("c:\\");
  81   paths.push_back("c:foo");
  82   paths.push_back("c:\\foo");
  83   paths.push_back("c:foo\\");
  84   paths.push_back("c:\\foo\\");
  85   paths.push_back("c:\\foo/");
  86   paths.push_back("c:/foo\\bar");
  87
  88   for (SmallVector<StringRef, 40>::const_iterator i = paths.begin(),
  89                                                   e = paths.end();
  90                                                   i != e;
  91                                                   ++i) {
  92     for (sys::path::const_iterator ci = sys::path::begin(*i),
  93                                    ce = sys::path::end(*i);
  94                                    ci != ce;
  95                                    ++ci) {
  96       ASSERT_FALSE(ci->empty());
  97     }
  98
  99 #if 0 // Valgrind is whining about this.
 100     outs() << "    Reverse Iteration: [";
 101     for (sys::path::reverse_iterator ci = sys::path::rbegin(*i),
 102                                      ce = sys::path::rend(*i);
 103                                      ci != ce;
 104                                      ++ci) {
 105       outs() << *ci << ',';
 106     }
 107     outs() << "]\n";
 108 #endif
 109
 110     path::has_root_path(*i);
 111     path::root_path(*i);
 112     path::has_root_name(*i);
 113     path::root_name(*i);
 114     path::has_root_directory(*i);
 115     path::root_directory(*i);
 116     path::has_parent_path(*i);
 117     path::parent_path(*i);
 118     path::has_filename(*i);
 119     path::filename(*i);
 120     path::has_stem(*i);
 121     path::stem(*i);
 122     path::has_extension(*i);
 123     path::extension(*i);
 124     path::is_absolute(*i);
 125     path::is_relative(*i);
 126
 127     SmallString<128> temp_store;
 128     temp_store = *i;
 129     ASSERT_NO_ERROR(fs::make_absolute(temp_store));
 130     temp_store = *i;
 131     path::remove_filename(temp_store);
 132
 133     temp_store = *i;
 134     path::replace_extension(temp_store, "ext");
 135     StringRef filename(temp_store.begin(), temp_store.size()), stem, ext;
 136     stem = path::stem(filename);
 137     ext  = path::extension(filename);
 138     EXPECT_EQ(*(--sys::path::end(filename)), (stem + ext).str());
 139
 140     path::native(*i, temp_store);
 141   }
 142 }
 143
 144 TEST(Support, RelativePathIterator) {
 145   SmallString<64> Path(StringRef("c/d/e/foo.txt"));
 146   typedef SmallVector<StringRef, 4> PathComponents;
 147   PathComponents ExpectedPathComponents;
 148   PathComponents ActualPathComponents;
 149
 150   StringRef(Path).split(ExpectedPathComponents, "/");
 151
 152   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 153        ++I) {
 154     ActualPathComponents.push_back(*I);
 155   }
 156
 157   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 158
 159   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 160     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 161   }
 162 }
 163
 164 TEST(Support, AbsolutePathIterator) {
 165   SmallString<64> Path(StringRef("/c/d/e/foo.txt"));
 166   typedef SmallVector<StringRef, 4> PathComponents;
 167   PathComponents ExpectedPathComponents;
 168   PathComponents ActualPathComponents;
 169
 170   StringRef(Path).split(ExpectedPathComponents, "/");
 171
 172   // The root path will also be a component when iterating
 173   ExpectedPathComponents[0] = "/";
 174
 175   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 176        ++I) {
 177     ActualPathComponents.push_back(*I);
 178   }
 179
 180   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 181
 182   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 183     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 184   }
 185 }
 186
 187 #ifdef LLVM_ON_WIN32
 188 TEST(Support, AbsolutePathIteratorWin32) {
 189   SmallString<64> Path(StringRef("c:\\c\\e\\foo.txt"));
 190   typedef SmallVector<StringRef, 4> PathComponents;
 191   PathComponents ExpectedPathComponents;
 192   PathComponents ActualPathComponents;
 193
 194   StringRef(Path).split(ExpectedPathComponents, "\\");
 195
 196   // The root path (which comes after the drive name) will also be a component
 197   // when iterating.
 198   ExpectedPathComponents.insert(ExpectedPathComponents.begin()+1, "\\");
 199
 200   for (path::const_iterator I = path::begin(Path), E = path::end(Path); I != E;
 201        ++I) {
 202     ActualPathComponents.push_back(*I);
 203   }
 204
 205   ASSERT_EQ(ExpectedPathComponents.size(), ActualPathComponents.size());
 206
 207   for (size_t i = 0; i <ExpectedPathComponents.size(); ++i) {
 208     EXPECT_EQ(ExpectedPathComponents[i].str(), ActualPathComponents[i].str());
 209   }
 210 }
 211 #endif // LLVM_ON_WIN32
 212
 213 class FileSystemTest : public testing::Test {
 214 protected:
 215   /// Unique temporary directory in which all created filesystem entities must
 216   /// be placed. It is recursively removed at the end of each test.
 217   SmallString<128> TestDirectory;
 218
 219   virtual void SetUp() {
 220     ASSERT_NO_ERROR(
 221         fs::createUniqueDirectory("file-system-test", TestDirectory));
 222     // We don't care about this specific file.
 223     errs() << "Test Directory: " << TestDirectory << '\n';
 224     errs().flush();
 225   }
 226
 227   virtual void TearDown() {
 228     ASSERT_NO_ERROR(fs::remove(TestDirectory.str()));
 229   }
 230 };
 231
 232 TEST_F(FileSystemTest, Unique) {
 233   // Create a temp file.
 234   int FileDescriptor;
 235   SmallString<64> TempPath;
 236   ASSERT_NO_ERROR(
 237       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 238
 239   // The same file should return an identical unique id.
 240   fs::UniqueID F1, F2;
 241   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), F1));
 242   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath), F2));
 243   ASSERT_EQ(F1, F2);
 244
 245   // Different files should return different unique ids.
 246   int FileDescriptor2;
 247   SmallString<64> TempPath2;
 248   ASSERT_NO_ERROR(
 249       fs::createTemporaryFile("prefix", "temp", FileDescriptor2, TempPath2));
 250
 251   fs::UniqueID D;
 252   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath2), D));
 253   ASSERT_NE(D, F1);
 254   ::close(FileDescriptor2);
 255
 256   ASSERT_NO_ERROR(fs::remove(Twine(TempPath2)));
 257
 258   // Two paths representing the same file on disk should still provide the
 259   // same unique id.  We can test this by making a hard link.
 260   ASSERT_NO_ERROR(fs::create_hard_link(Twine(TempPath), Twine(TempPath2)));
 261   fs::UniqueID D2;
 262   ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath2), D2));
 263   ASSERT_EQ(D2, F1);
 264
 265   ::close(FileDescriptor);
 266
 267   SmallString<128> Dir1;
 268   ASSERT_NO_ERROR(
 269      fs::createUniqueDirectory("dir1", Dir1));
 270   ASSERT_NO_ERROR(fs::getUniqueID(Dir1.c_str(), F1));
 271   ASSERT_NO_ERROR(fs::getUniqueID(Dir1.c_str(), F2));
 272   ASSERT_EQ(F1, F2);
 273
 274   SmallString<128> Dir2;
 275   ASSERT_NO_ERROR(
 276      fs::createUniqueDirectory("dir2", Dir2));
 277   ASSERT_NO_ERROR(fs::getUniqueID(Dir2.c_str(), F2));
 278   ASSERT_NE(F1, F2);
 279 }
 280
 281 TEST_F(FileSystemTest, TempFiles) {
 282   // Create a temp file.
 283   int FileDescriptor;
 284   SmallString<64> TempPath;
 285   ASSERT_NO_ERROR(
 286       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 287
 288   // Make sure it exists.
 289   bool TempFileExists;
 290   ASSERT_NO_ERROR(sys::fs::exists(Twine(TempPath), TempFileExists));
 291   EXPECT_TRUE(TempFileExists);
 292
 293   // Create another temp tile.
 294   int FD2;
 295   SmallString<64> TempPath2;
 296   ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "temp", FD2, TempPath2));
 297   ASSERT_TRUE(TempPath2.endswith(".temp"));
 298   ASSERT_NE(TempPath.str(), TempPath2.str());
 299
 300   fs::file_status A, B;
 301   ASSERT_NO_ERROR(fs::status(Twine(TempPath), A));
 302   ASSERT_NO_ERROR(fs::status(Twine(TempPath2), B));
 303   EXPECT_FALSE(fs::equivalent(A, B));
 304
 305   ::close(FD2);
 306
 307   // Remove Temp2.
 308   ASSERT_NO_ERROR(fs::remove(Twine(TempPath2), TempFileExists));
 309   EXPECT_TRUE(TempFileExists);
 310
 311   error_code EC = fs::status(TempPath2.c_str(), B);
 312   EXPECT_EQ(EC, errc::no_such_file_or_directory);
 313   EXPECT_EQ(B.type(), fs::file_type::file_not_found);
 314
 315   // Make sure Temp2 doesn't exist.
 316   ASSERT_NO_ERROR(fs::exists(Twine(TempPath2), TempFileExists));
 317   EXPECT_FALSE(TempFileExists);
 318
 319   SmallString<64> TempPath3;
 320   ASSERT_NO_ERROR(fs::createTemporaryFile("prefix", "", TempPath3));
 321   ASSERT_FALSE(TempPath3.endswith("."));
 322
 323   // Create a hard link to Temp1.
 324   ASSERT_NO_ERROR(fs::create_hard_link(Twine(TempPath), Twine(TempPath2)));
 325   bool equal;
 326   ASSERT_NO_ERROR(fs::equivalent(Twine(TempPath), Twine(TempPath2), equal));
 327   EXPECT_TRUE(equal);
 328   ASSERT_NO_ERROR(fs::status(Twine(TempPath), A));
 329   ASSERT_NO_ERROR(fs::status(Twine(TempPath2), B));
 330   EXPECT_TRUE(fs::equivalent(A, B));
 331
 332   // Remove Temp1.
 333   ::close(FileDescriptor);
 334   ASSERT_NO_ERROR(fs::remove(Twine(TempPath), TempFileExists));
 335   EXPECT_TRUE(TempFileExists);
 336
 337   // Remove the hard link.
 338   ASSERT_NO_ERROR(fs::remove(Twine(TempPath2), TempFileExists));
 339   EXPECT_TRUE(TempFileExists);
 340
 341   // Make sure Temp1 doesn't exist.
 342   ASSERT_NO_ERROR(fs::exists(Twine(TempPath), TempFileExists));
 343   EXPECT_FALSE(TempFileExists);
 344
 345 #ifdef LLVM_ON_WIN32
 346   // Path name > 260 chars should get an error.
 347   const char *Path270 =
 348     "abcdefghijklmnopqrstuvwxyz9abcdefghijklmnopqrstuvwxyz8"
 349     "abcdefghijklmnopqrstuvwxyz7abcdefghijklmnopqrstuvwxyz6"
 350     "abcdefghijklmnopqrstuvwxyz5abcdefghijklmnopqrstuvwxyz4"
 351     "abcdefghijklmnopqrstuvwxyz3abcdefghijklmnopqrstuvwxyz2"
 352     "abcdefghijklmnopqrstuvwxyz1abcdefghijklmnopqrstuvwxyz0";
 353   EXPECT_EQ(fs::createUniqueFile(Twine(Path270), FileDescriptor, TempPath),
 354             windows_error::path_not_found);
 355 #endif
 356 }
 357
 358 TEST_F(FileSystemTest, DirectoryIteration) {
 359   error_code ec;
 360   for (fs::directory_iterator i(".", ec), e; i != e; i.increment(ec))
 361     ASSERT_NO_ERROR(ec);
 362
 363   // Create a known hierarchy to recurse over.
 364   bool existed;
 365   ASSERT_NO_ERROR(fs::create_directories(Twine(TestDirectory)
 366                   + "/recursive/a0/aa1", existed));
 367   ASSERT_NO_ERROR(fs::create_directories(Twine(TestDirectory)
 368                   + "/recursive/a0/ab1", existed));
 369   ASSERT_NO_ERROR(fs::create_directories(Twine(TestDirectory)
 370                   + "/recursive/dontlookhere/da1", existed));
 371   ASSERT_NO_ERROR(fs::create_directories(Twine(TestDirectory)
 372                   + "/recursive/z0/za1", existed));
 373   ASSERT_NO_ERROR(fs::create_directories(Twine(TestDirectory)
 374                   + "/recursive/pop/p1", existed));
 375   typedef std::vector<std::string> v_t;
 376   v_t visited;
 377   for (fs::recursive_directory_iterator i(Twine(TestDirectory)
 378          + "/recursive", ec), e; i != e; i.increment(ec)){
 379     ASSERT_NO_ERROR(ec);
 380     if (path::filename(i->path()) == "p1") {
 381       i.pop();
 382       // FIXME: recursive_directory_iterator should be more robust.
 383       if (i == e) break;
 384     }
 385     if (path::filename(i->path()) == "dontlookhere")
 386       i.no_push();
 387     visited.push_back(path::filename(i->path()));
 388   }
 389   v_t::const_iterator a0 = std::find(visited.begin(), visited.end(), "a0");
 390   v_t::const_iterator aa1 = std::find(visited.begin(), visited.end(), "aa1");
 391   v_t::const_iterator ab1 = std::find(visited.begin(), visited.end(), "ab1");
 392   v_t::const_iterator dontlookhere = std::find(visited.begin(), visited.end(),
 393                                                "dontlookhere");
 394   v_t::const_iterator da1 = std::find(visited.begin(), visited.end(), "da1");
 395   v_t::const_iterator z0 = std::find(visited.begin(), visited.end(), "z0");
 396   v_t::const_iterator za1 = std::find(visited.begin(), visited.end(), "za1");
 397   v_t::const_iterator pop = std::find(visited.begin(), visited.end(), "pop");
 398   v_t::const_iterator p1 = std::find(visited.begin(), visited.end(), "p1");
 399
 400   // Make sure that each path was visited correctly.
 401   ASSERT_NE(a0, visited.end());
 402   ASSERT_NE(aa1, visited.end());
 403   ASSERT_NE(ab1, visited.end());
 404   ASSERT_NE(dontlookhere, visited.end());
 405   ASSERT_EQ(da1, visited.end()); // Not visited.
 406   ASSERT_NE(z0, visited.end());
 407   ASSERT_NE(za1, visited.end());
 408   ASSERT_NE(pop, visited.end());
 409   ASSERT_EQ(p1, visited.end()); // Not visited.
 410
 411   // Make sure that parents were visited before children. No other ordering
 412   // guarantees can be made across siblings.
 413   ASSERT_LT(a0, aa1);
 414   ASSERT_LT(a0, ab1);
 415   ASSERT_LT(z0, za1);
 416
 417   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0/aa1"));
 418   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0/ab1"));
 419   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/a0"));
 420   ASSERT_NO_ERROR(
 421       fs::remove(Twine(TestDirectory) + "/recursive/dontlookhere/da1"));
 422   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/dontlookhere"));
 423   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/pop/p1"));
 424   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/pop"));
 425   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/z0/za1"));
 426   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive/z0"));
 427   ASSERT_NO_ERROR(fs::remove(Twine(TestDirectory) + "/recursive"));
 428 }
 429
 430 const char archive[] = "!<arch>\x0A";
 431 const char bitcode[] = "\xde\xc0\x17\x0b";
 432 const char coff_object[] = "\x00\x00......";
 433 const char coff_import_library[] = "\x00\x00\xff\xff....";
 434 const char elf_relocatable[] = { 0x7f, 'E', 'L', 'F', 1, 2, 1, 0, 0,
 435                                  0,    0,   0,   0,   0, 0, 0, 0, 1 };
 436 const char macho_universal_binary[] = "\xca\xfe\xba\xbe...\0x00";
 437 const char macho_object[] = "\xfe\xed\xfa\xce..........\x00\x01";
 438 const char macho_executable[] = "\xfe\xed\xfa\xce..........\x00\x02";
 439 const char macho_fixed_virtual_memory_shared_lib[] =
 440     "\xfe\xed\xfa\xce..........\x00\x03";
 441 const char macho_core[] = "\xfe\xed\xfa\xce..........\x00\x04";
 442 const char macho_preload_executable[] = "\xfe\xed\xfa\xce..........\x00\x05";
 443 const char macho_dynamically_linked_shared_lib[] =
 444     "\xfe\xed\xfa\xce..........\x00\x06";
 445 const char macho_dynamic_linker[] = "\xfe\xed\xfa\xce..........\x00\x07";
 446 const char macho_bundle[] = "\xfe\xed\xfa\xce..........\x00\x08";
 447 const char macho_dsym_companion[] = "\xfe\xed\xfa\xce..........\x00\x0a";
 448 const char windows_resource[] = "\x00\x00\x00\x00\x020\x00\x00\x00\xff";
 449
 450 TEST_F(FileSystemTest, Magic) {
 451   struct type {
 452     const char *filename;
 453     const char *magic_str;
 454     size_t magic_str_len;
 455     fs::file_magic magic;
 456   } types[] = {
 457 #define DEFINE(magic)                                           \
 458     { #magic, magic, sizeof(magic), fs::file_magic::magic }
 459     DEFINE(archive),
 460     DEFINE(bitcode),
 461     DEFINE(coff_object),
 462     DEFINE(coff_import_library),
 463     DEFINE(elf_relocatable),
 464     DEFINE(macho_universal_binary),
 465     DEFINE(macho_object),
 466     DEFINE(macho_executable),
 467     DEFINE(macho_fixed_virtual_memory_shared_lib),
 468     DEFINE(macho_core),
 469     DEFINE(macho_preload_executable),
 470     DEFINE(macho_dynamically_linked_shared_lib),
 471     DEFINE(macho_dynamic_linker),
 472     DEFINE(macho_bundle),
 473     DEFINE(macho_dsym_companion),
 474     DEFINE(windows_resource)
 475 #undef DEFINE
 476     };
 477
 478   // Create some files filled with magic.
 479   for (type *i = types, *e = types + (sizeof(types) / sizeof(type)); i != e;
 480                                                                      ++i) {
 481     SmallString<128> file_pathname(TestDirectory);
 482     path::append(file_pathname, i->filename);
 483     std::string ErrMsg;
 484     raw_fd_ostream file(file_pathname.c_str(), ErrMsg, sys::fs::F_Binary);
 485     ASSERT_FALSE(file.has_error());
 486     StringRef magic(i->magic_str, i->magic_str_len);
 487     file << magic;
 488     file.close();
 489     bool res = false;
 490     ASSERT_NO_ERROR(fs::has_magic(file_pathname.c_str(), magic, res));
 491     EXPECT_TRUE(res);
 492     EXPECT_EQ(i->magic, fs::identify_magic(magic));
 493     ASSERT_NO_ERROR(fs::remove(Twine(file_pathname)));
 494   }
 495 }
 496
 497 #ifdef LLVM_ON_WIN32
 498 TEST_F(FileSystemTest, CarriageReturn) {
 499   SmallString<128> FilePathname(TestDirectory);
 500   std::string ErrMsg;
 501   path::append(FilePathname, "test");
 502
 503   {
 504     raw_fd_ostream File(FilePathname.c_str(), ErrMsg);
 505     EXPECT_EQ(ErrMsg, "");
 506     File << '\n';
 507   }
 508   {
 509     OwningPtr<MemoryBuffer> Buf;
 510     MemoryBuffer::getFile(FilePathname.c_str(), Buf);
 511     EXPECT_EQ(Buf->getBuffer(), "\r\n");
 512   }
 513
 514   {
 515     raw_fd_ostream File(FilePathname.c_str(), ErrMsg, sys::fs::F_Binary);
 516     EXPECT_EQ(ErrMsg, "");
 517     File << '\n';
 518   }
 519   {
 520     OwningPtr<MemoryBuffer> Buf;
 521     MemoryBuffer::getFile(FilePathname.c_str(), Buf);
 522     EXPECT_EQ(Buf->getBuffer(), "\n");
 523   }
 524   ASSERT_NO_ERROR(fs::remove(Twine(FilePathname)));
 525 }
 526 #endif
 527
 528 TEST_F(FileSystemTest, FileMapping) {
 529   // Create a temp file.
 530   int FileDescriptor;
 531   SmallString<64> TempPath;
 532   ASSERT_NO_ERROR(
 533       fs::createTemporaryFile("prefix", "temp", FileDescriptor, TempPath));
 534   // Map in temp file and add some content
 535   error_code EC;
 536   StringRef Val("hello there");
 537   {
 538     fs::mapped_file_region mfr(FileDescriptor,
 539                                true,
 540                                fs::mapped_file_region::readwrite,
 541                                4096,
 542                                0,
 543                                EC);
 544     ASSERT_NO_ERROR(EC);
 545     std::copy(Val.begin(), Val.end(), mfr.data());
 546     // Explicitly add a 0.
 547     mfr.data()[Val.size()] = 0;
 548     // Unmap temp file
 549   }
 550
 551   // Map it back in read-only
 552   fs::mapped_file_region mfr(Twine(TempPath),
 553                              fs::mapped_file_region::readonly,
 554                              0,
 555                              0,
 556                              EC);
 557   ASSERT_NO_ERROR(EC);
 558
 559   // Verify content
 560   EXPECT_EQ(StringRef(mfr.const_data()), Val);
 561
 562   // Unmap temp file
 563
 564 #if LLVM_HAS_RVALUE_REFERENCES
 565   fs::mapped_file_region m(Twine(TempPath),
 566                              fs::mapped_file_region::readonly,
 567                              0,
 568                              0,
 569                              EC);
 570   ASSERT_NO_ERROR(EC);
 571   const char *Data = m.const_data();
 572   fs::mapped_file_region mfrrv(llvm_move(m));
 573   EXPECT_EQ(mfrrv.const_data(), Data);
 574 #endif
 575 }
 576 } // anonymous namespace