contrib/llvm/tools/clang/lib/Frontend/InitHeaderSearch.cpp

   1 //===--- InitHeaderSearch.cpp - Initialize header search paths ------------===//
   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 // This file implements the InitHeaderSearch class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/Basic/FileManager.h"
  15 #include "clang/Basic/LangOptions.h"
  16 #include "clang/Config/config.h" // C_INCLUDE_DIRS
  17 #include "clang/Frontend/Utils.h"
  18 #include "clang/Lex/HeaderMap.h"
  19 #include "clang/Lex/HeaderSearch.h"
  20 #include "clang/Lex/HeaderSearchOptions.h"
  21 #include "llvm/ADT/SmallPtrSet.h"
  22 #include "llvm/ADT/SmallString.h"
  23 #include "llvm/ADT/SmallVector.h"
  24 #include "llvm/ADT/StringExtras.h"
  25 #include "llvm/ADT/Triple.h"
  26 #include "llvm/ADT/Twine.h"
  27 #include "llvm/Support/ErrorHandling.h"
  28 #include "llvm/Support/Path.h"
  29 #include "llvm/Support/raw_ostream.h"
  30
  31 using namespace clang;
  32 using namespace clang::frontend;
  33
  34 namespace {
  35
  36 /// InitHeaderSearch - This class makes it easier to set the search paths of
  37 ///  a HeaderSearch object. InitHeaderSearch stores several search path lists
  38 ///  internally, which can be sent to a HeaderSearch object in one swoop.
  39 class InitHeaderSearch {
  40   std::vector<std::pair<IncludeDirGroup, DirectoryLookup> > IncludePath;
  41   typedef std::vector<std::pair<IncludeDirGroup,
  42                       DirectoryLookup> >::const_iterator path_iterator;
  43   std::vector<std::pair<std::string, bool> > SystemHeaderPrefixes;
  44   HeaderSearch &Headers;
  45   bool Verbose;
  46   std::string IncludeSysroot;
  47   bool HasSysroot;
  48
  49 public:
  50
  51   InitHeaderSearch(HeaderSearch &HS, bool verbose, StringRef sysroot)
  52     : Headers(HS), Verbose(verbose), IncludeSysroot(sysroot),
  53       HasSysroot(!(sysroot.empty() || sysroot == "/")) {
  54   }
  55
  56   /// AddPath - Add the specified path to the specified group list, prefixing
  57   /// the sysroot if used.
  58   void AddPath(const Twine &Path, IncludeDirGroup Group, bool isFramework);
  59
  60   /// AddUnmappedPath - Add the specified path to the specified group list,
  61   /// without performing any sysroot remapping.
  62   void AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
  63                        bool isFramework);
  64
  65   /// AddSystemHeaderPrefix - Add the specified prefix to the system header
  66   /// prefix list.
  67   void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
  68     SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);
  69   }
  70
  71   /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
  72   ///  libstdc++.
  73   void AddGnuCPlusPlusIncludePaths(StringRef Base,
  74                                    StringRef ArchDir,
  75                                    StringRef Dir32,
  76                                    StringRef Dir64,
  77                                    const llvm::Triple &triple);
  78
  79   /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to support a MinGW
  80   ///  libstdc++.
  81   void AddMinGWCPlusPlusIncludePaths(StringRef Base,
  82                                      StringRef Arch,
  83                                      StringRef Version);
  84
  85   // AddDefaultCIncludePaths - Add paths that should always be searched.
  86   void AddDefaultCIncludePaths(const llvm::Triple &triple,
  87                                const HeaderSearchOptions &HSOpts);
  88
  89   // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
  90   //  compiling c++.
  91   void AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple,
  92                                        const HeaderSearchOptions &HSOpts);
  93
  94   /// AddDefaultSystemIncludePaths - Adds the default system include paths so
  95   ///  that e.g. stdio.h is found.
  96   void AddDefaultIncludePaths(const LangOptions &Lang,
  97                               const llvm::Triple &triple,
  98                               const HeaderSearchOptions &HSOpts);
  99
 100   /// Realize - Merges all search path lists into one list and send it to
 101   /// HeaderSearch.
 102   void Realize(const LangOptions &Lang);
 103 };
 104
 105 }  // end anonymous namespace.
 106
 107 static bool CanPrefixSysroot(StringRef Path) {
 108 #if defined(LLVM_ON_WIN32)
 109   return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
 110 #else
 111   return llvm::sys::path::is_absolute(Path);
 112 #endif
 113 }
 114
 115 void InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
 116                                bool isFramework) {
 117   // Add the path with sysroot prepended, if desired and this is a system header
 118   // group.
 119   if (HasSysroot) {
 120     SmallString<256> MappedPathStorage;
 121     StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 122     if (CanPrefixSysroot(MappedPathStr)) {
 123       AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
 124       return;
 125     }
 126   }
 127
 128   AddUnmappedPath(Path, Group, isFramework);
 129 }
 130
 131 void InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
 132                                        bool isFramework) {
 133   assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
 134
 135   FileManager &FM = Headers.getFileMgr();
 136   SmallString<256> MappedPathStorage;
 137   StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 138
 139   // Compute the DirectoryLookup type.
 140   SrcMgr::CharacteristicKind Type;
 141   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
 142     Type = SrcMgr::C_User;
 143   } else if (Group == ExternCSystem) {
 144     Type = SrcMgr::C_ExternCSystem;
 145   } else {
 146     Type = SrcMgr::C_System;
 147   }
 148
 149   // If the directory exists, add it.
 150   if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
 151     IncludePath.push_back(
 152       std::make_pair(Group, DirectoryLookup(DE, Type, isFramework)));
 153     return;
 154   }
 155
 156   // Check to see if this is an apple-style headermap (which are not allowed to
 157   // be frameworks).
 158   if (!isFramework) {
 159     if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
 160       if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
 161         // It is a headermap, add it to the search path.
 162         IncludePath.push_back(
 163           std::make_pair(Group,
 164                          DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
 165         return;
 166       }
 167     }
 168   }
 169
 170   if (Verbose)
 171     llvm::errs() << "ignoring nonexistent directory \""
 172                  << MappedPathStr << "\"\n";
 173 }
 174
 175 void InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
 176                                                    StringRef ArchDir,
 177                                                    StringRef Dir32,
 178                                                    StringRef Dir64,
 179                                                    const llvm::Triple &triple) {
 180   // Add the base dir
 181   AddPath(Base, CXXSystem, false);
 182
 183   // Add the multilib dirs
 184   llvm::Triple::ArchType arch = triple.getArch();
 185   bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
 186   if (is64bit)
 187     AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
 188   else
 189     AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
 190
 191   // Add the backward dir
 192   AddPath(Base + "/backward", CXXSystem, false);
 193 }
 194
 195 void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
 196                                                      StringRef Arch,
 197                                                      StringRef Version) {
 198   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
 199           CXXSystem, false);
 200   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
 201           CXXSystem, false);
 202   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
 203           CXXSystem, false);
 204 }
 205
 206 void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
 207                                             const HeaderSearchOptions &HSOpts) {
 208   llvm::Triple::OSType os = triple.getOS();
 209
 210   if (HSOpts.UseStandardSystemIncludes) {
 211     switch (os) {
 212     case llvm::Triple::CloudABI:
 213     case llvm::Triple::FreeBSD:
 214     case llvm::Triple::NetBSD:
 215     case llvm::Triple::OpenBSD:
 216     case llvm::Triple::Bitrig:
 217     case llvm::Triple::NaCl:
 218     case llvm::Triple::PS4:
 219     case llvm::Triple::ELFIAMCU:
 220       break;
 221     case llvm::Triple::Win32:
 222       if (triple.getEnvironment() != llvm::Triple::Cygnus)
 223         break;
 224       LLVM_FALLTHROUGH;
 225     default:
 226       // FIXME: temporary hack: hard-coded paths.
 227       AddPath("/usr/local/include", System, false);
 228       break;
 229     }
 230   }
 231
 232   // Builtin includes use #include_next directives and should be positioned
 233   // just prior C include dirs.
 234   if (HSOpts.UseBuiltinIncludes) {
 235     // Ignore the sys root, we *always* look for clang headers relative to
 236     // supplied path.
 237     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 238     llvm::sys::path::append(P, "include");
 239     AddUnmappedPath(P, ExternCSystem, false);
 240   }
 241
 242   // All remaining additions are for system include directories, early exit if
 243   // we aren't using them.
 244   if (!HSOpts.UseStandardSystemIncludes)
 245     return;
 246
 247   // Add dirs specified via 'configure --with-c-include-dirs'.
 248   StringRef CIncludeDirs(C_INCLUDE_DIRS);
 249   if (CIncludeDirs != "") {
 250     SmallVector<StringRef, 5> dirs;
 251     CIncludeDirs.split(dirs, ":");
 252     for (StringRef dir : dirs)
 253       AddPath(dir, ExternCSystem, false);
 254     return;
 255   }
 256
 257   switch (os) {
 258   case llvm::Triple::Linux:
 259     llvm_unreachable("Include management is handled in the driver.");
 260
 261   case llvm::Triple::CloudABI: {
 262     // <sysroot>/<triple>/include
 263     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 264     llvm::sys::path::append(P, "../../..", triple.str(), "include");
 265     AddPath(P, System, false);
 266     break;
 267   }
 268
 269   case llvm::Triple::Haiku:
 270     AddPath("/boot/system/non-packaged/develop/headers", System, false);
 271     AddPath("/boot/system/develop/headers/os", System, false);
 272     AddPath("/boot/system/develop/headers/os/app", System, false);
 273     AddPath("/boot/system/develop/headers/os/arch", System, false);
 274     AddPath("/boot/system/develop/headers/os/device", System, false);
 275     AddPath("/boot/system/develop/headers/os/drivers", System, false);
 276     AddPath("/boot/system/develop/headers/os/game", System, false);
 277     AddPath("/boot/system/develop/headers/os/interface", System, false);
 278     AddPath("/boot/system/develop/headers/os/kernel", System, false);
 279     AddPath("/boot/system/develop/headers/os/locale", System, false);
 280     AddPath("/boot/system/develop/headers/os/mail", System, false);
 281     AddPath("/boot/system/develop/headers/os/media", System, false);
 282     AddPath("/boot/system/develop/headers/os/midi", System, false);
 283     AddPath("/boot/system/develop/headers/os/midi2", System, false);
 284     AddPath("/boot/system/develop/headers/os/net", System, false);
 285     AddPath("/boot/system/develop/headers/os/opengl", System, false);
 286     AddPath("/boot/system/develop/headers/os/storage", System, false);
 287     AddPath("/boot/system/develop/headers/os/support", System, false);
 288     AddPath("/boot/system/develop/headers/os/translation", System, false);
 289     AddPath("/boot/system/develop/headers/os/add-ons/graphics", System, false);
 290     AddPath("/boot/system/develop/headers/os/add-ons/input_server", System, false);
 291     AddPath("/boot/system/develop/headers/os/add-ons/mail_daemon", System, false);
 292     AddPath("/boot/system/develop/headers/os/add-ons/registrar", System, false);
 293     AddPath("/boot/system/develop/headers/os/add-ons/screen_saver", System, false);
 294     AddPath("/boot/system/develop/headers/os/add-ons/tracker", System, false);
 295     AddPath("/boot/system/develop/headers/os/be_apps/Deskbar", System, false);
 296     AddPath("/boot/system/develop/headers/os/be_apps/NetPositive", System, false);
 297     AddPath("/boot/system/develop/headers/os/be_apps/Tracker", System, false);
 298     AddPath("/boot/system/develop/headers/3rdparty", System, false);
 299     AddPath("/boot/system/develop/headers/bsd", System, false);
 300     AddPath("/boot/system/develop/headers/glibc", System, false);
 301     AddPath("/boot/system/develop/headers/posix", System, false);
 302     AddPath("/boot/system/develop/headers",  System, false);
 303     break;
 304   case llvm::Triple::RTEMS:
 305     break;
 306   case llvm::Triple::Win32:
 307     switch (triple.getEnvironment()) {
 308     default: llvm_unreachable("Include management is handled in the driver.");
 309     case llvm::Triple::Cygnus:
 310       AddPath("/usr/include/w32api", System, false);
 311       break;
 312     case llvm::Triple::GNU:
 313       break;
 314     }
 315     break;
 316   default:
 317     break;
 318   }
 319
 320   switch (os) {
 321   case llvm::Triple::CloudABI:
 322   case llvm::Triple::RTEMS:
 323   case llvm::Triple::NaCl:
 324   case llvm::Triple::ELFIAMCU:
 325     break;
 326   case llvm::Triple::PS4: {
 327     // <isysroot> gets prepended later in AddPath().
 328     std::string BaseSDKPath = "";
 329     if (!HasSysroot) {
 330       const char *envValue = getenv("SCE_ORBIS_SDK_DIR");
 331       if (envValue)
 332         BaseSDKPath = envValue;
 333       else {
 334         // HSOpts.ResourceDir variable contains the location of Clang's
 335         // resource files.
 336         // Assuming that Clang is configured for PS4 without
 337         // --with-clang-resource-dir option, the location of Clang's resource
 338         // files is <SDK_DIR>/host_tools/lib/clang
 339         SmallString<128> P = StringRef(HSOpts.ResourceDir);
 340         llvm::sys::path::append(P, "../../..");
 341         BaseSDKPath = P.str();
 342       }
 343     }
 344     AddPath(BaseSDKPath + "/target/include", System, false);
 345     if (triple.isPS4CPU())
 346       AddPath(BaseSDKPath + "/target/include_common", System, false);
 347     LLVM_FALLTHROUGH;
 348   }
 349   default:
 350     AddPath("/usr/include", ExternCSystem, false);
 351     break;
 352   }
 353 }
 354
 355 void InitHeaderSearch::
 356 AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple, const HeaderSearchOptions &HSOpts) {
 357   llvm::Triple::OSType os = triple.getOS();
 358   // FIXME: temporary hack: hard-coded paths.
 359
 360   if (triple.isOSDarwin()) {
 361     switch (triple.getArch()) {
 362     default: break;
 363
 364     case llvm::Triple::ppc:
 365     case llvm::Triple::ppc64:
 366       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 367                                   "powerpc-apple-darwin10", "", "ppc64",
 368                                   triple);
 369       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 370                                   "powerpc-apple-darwin10", "", "ppc64",
 371                                   triple);
 372       break;
 373
 374     case llvm::Triple::x86:
 375     case llvm::Triple::x86_64:
 376       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 377                                   "i686-apple-darwin10", "", "x86_64", triple);
 378       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 379                                   "i686-apple-darwin8", "", "", triple);
 380       break;
 381
 382     case llvm::Triple::arm:
 383     case llvm::Triple::thumb:
 384       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 385                                   "arm-apple-darwin10", "v7", "", triple);
 386       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 387                                   "arm-apple-darwin10", "v6", "", triple);
 388       break;
 389
 390     case llvm::Triple::aarch64:
 391       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 392                                   "arm64-apple-darwin10", "", "", triple);
 393       break;
 394     }
 395     return;
 396   }
 397
 398   switch (os) {
 399   case llvm::Triple::Linux:
 400     llvm_unreachable("Include management is handled in the driver.");
 401     break;
 402   case llvm::Triple::Win32:
 403     switch (triple.getEnvironment()) {
 404     default: llvm_unreachable("Include management is handled in the driver.");
 405     case llvm::Triple::Cygnus:
 406       // Cygwin-1.7
 407       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
 408       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
 409       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
 410       // g++-4 / Cygwin-1.5
 411       AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
 412       break;
 413     }
 414     break;
 415   case llvm::Triple::DragonFly:
 416     AddPath("/usr/include/c++/5.0", CXXSystem, false);
 417     break;
 418   case llvm::Triple::OpenBSD: {
 419     std::string t = triple.getTriple();
 420     if (t.substr(0, 6) == "x86_64")
 421       t.replace(0, 6, "amd64");
 422     AddGnuCPlusPlusIncludePaths("/usr/include/g++",
 423                                 t, "", "", triple);
 424     break;
 425   }
 426   case llvm::Triple::Minix:
 427     AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
 428                                 "", "", "", triple);
 429     break;
 430   default:
 431     break;
 432   }
 433 }
 434
 435 void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
 436                                               const llvm::Triple &triple,
 437                                             const HeaderSearchOptions &HSOpts) {
 438   // NB: This code path is going away. All of the logic is moving into the
 439   // driver which has the information necessary to do target-specific
 440   // selections of default include paths. Each target which moves there will be
 441   // exempted from this logic here until we can delete the entire pile of code.
 442   switch (triple.getOS()) {
 443   default:
 444     break; // Everything else continues to use this routine's logic.
 445
 446   case llvm::Triple::Linux:
 447     return;
 448
 449   case llvm::Triple::Win32:
 450     if (triple.getEnvironment() != llvm::Triple::Cygnus ||
 451         triple.isOSBinFormatMachO())
 452       return;
 453     break;
 454   }
 455
 456   if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
 457       HSOpts.UseStandardSystemIncludes) {
 458     if (HSOpts.UseLibcxx) {
 459       if (triple.isOSDarwin()) {
 460         // On Darwin, libc++ may be installed alongside the compiler in
 461         // include/c++/v1.
 462         if (!HSOpts.ResourceDir.empty()) {
 463           // Remove version from foo/lib/clang/version
 464           StringRef NoVer = llvm::sys::path::parent_path(HSOpts.ResourceDir);
 465           // Remove clang from foo/lib/clang
 466           StringRef Lib = llvm::sys::path::parent_path(NoVer);
 467           // Remove lib from foo/lib
 468           SmallString<128> P = llvm::sys::path::parent_path(Lib);
 469
 470           // Get foo/include/c++/v1
 471           llvm::sys::path::append(P, "include", "c++", "v1");
 472           AddUnmappedPath(P, CXXSystem, false);
 473         }
 474       }
 475       AddPath("/usr/include/c++/v1", CXXSystem, false);
 476     } else {
 477       AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
 478     }
 479   }
 480
 481   AddDefaultCIncludePaths(triple, HSOpts);
 482
 483   // Add the default framework include paths on Darwin.
 484   if (HSOpts.UseStandardSystemIncludes) {
 485     if (triple.isOSDarwin()) {
 486       AddPath("/System/Library/Frameworks", System, true);
 487       AddPath("/Library/Frameworks", System, true);
 488     }
 489   }
 490 }
 491
 492 /// RemoveDuplicates - If there are duplicate directory entries in the specified
 493 /// search list, remove the later (dead) ones.  Returns the number of non-system
 494 /// headers removed, which is used to update NumAngled.
 495 static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
 496                                  unsigned First, bool Verbose) {
 497   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
 498   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
 499   llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
 500   unsigned NonSystemRemoved = 0;
 501   for (unsigned i = First; i != SearchList.size(); ++i) {
 502     unsigned DirToRemove = i;
 503
 504     const DirectoryLookup &CurEntry = SearchList[i];
 505
 506     if (CurEntry.isNormalDir()) {
 507       // If this isn't the first time we've seen this dir, remove it.
 508       if (SeenDirs.insert(CurEntry.getDir()).second)
 509         continue;
 510     } else if (CurEntry.isFramework()) {
 511       // If this isn't the first time we've seen this framework dir, remove it.
 512       if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
 513         continue;
 514     } else {
 515       assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 516       // If this isn't the first time we've seen this headermap, remove it.
 517       if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
 518         continue;
 519     }
 520
 521     // If we have a normal #include dir/framework/headermap that is shadowed
 522     // later in the chain by a system include location, we actually want to
 523     // ignore the user's request and drop the user dir... keeping the system
 524     // dir.  This is weird, but required to emulate GCC's search path correctly.
 525     //
 526     // Since dupes of system dirs are rare, just rescan to find the original
 527     // that we're nuking instead of using a DenseMap.
 528     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
 529       // Find the dir that this is the same of.
 530       unsigned FirstDir;
 531       for (FirstDir = First;; ++FirstDir) {
 532         assert(FirstDir != i && "Didn't find dupe?");
 533
 534         const DirectoryLookup &SearchEntry = SearchList[FirstDir];
 535
 536         // If these are different lookup types, then they can't be the dupe.
 537         if (SearchEntry.getLookupType() != CurEntry.getLookupType())
 538           continue;
 539
 540         bool isSame;
 541         if (CurEntry.isNormalDir())
 542           isSame = SearchEntry.getDir() == CurEntry.getDir();
 543         else if (CurEntry.isFramework())
 544           isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
 545         else {
 546           assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 547           isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
 548         }
 549
 550         if (isSame)
 551           break;
 552       }
 553
 554       // If the first dir in the search path is a non-system dir, zap it
 555       // instead of the system one.
 556       if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
 557         DirToRemove = FirstDir;
 558     }
 559
 560     if (Verbose) {
 561       llvm::errs() << "ignoring duplicate directory \""
 562                    << CurEntry.getName() << "\"\n";
 563       if (DirToRemove != i)
 564         llvm::errs() << "  as it is a non-system directory that duplicates "
 565                      << "a system directory\n";
 566     }
 567     if (DirToRemove != i)
 568       ++NonSystemRemoved;
 569
 570     // This is reached if the current entry is a duplicate.  Remove the
 571     // DirToRemove (usually the current dir).
 572     SearchList.erase(SearchList.begin()+DirToRemove);
 573     --i;
 574   }
 575   return NonSystemRemoved;
 576 }
 577
 578
 579 void InitHeaderSearch::Realize(const LangOptions &Lang) {
 580   // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
 581   std::vector<DirectoryLookup> SearchList;
 582   SearchList.reserve(IncludePath.size());
 583
 584   // Quoted arguments go first.
 585   for (auto &Include : IncludePath)
 586     if (Include.first == Quoted)
 587       SearchList.push_back(Include.second);
 588
 589   // Deduplicate and remember index.
 590   RemoveDuplicates(SearchList, 0, Verbose);
 591   unsigned NumQuoted = SearchList.size();
 592
 593   for (auto &Include : IncludePath)
 594     if (Include.first == Angled || Include.first == IndexHeaderMap)
 595       SearchList.push_back(Include.second);
 596
 597   RemoveDuplicates(SearchList, NumQuoted, Verbose);
 598   unsigned NumAngled = SearchList.size();
 599
 600   for (auto &Include : IncludePath)
 601     if (Include.first == System || Include.first == ExternCSystem ||
 602         (!Lang.ObjC1 && !Lang.CPlusPlus && Include.first == CSystem) ||
 603         (/*FIXME !Lang.ObjC1 && */ Lang.CPlusPlus &&
 604          Include.first == CXXSystem) ||
 605         (Lang.ObjC1 && !Lang.CPlusPlus && Include.first == ObjCSystem) ||
 606         (Lang.ObjC1 && Lang.CPlusPlus && Include.first == ObjCXXSystem))
 607       SearchList.push_back(Include.second);
 608
 609   for (auto &Include : IncludePath)
 610     if (Include.first == After)
 611       SearchList.push_back(Include.second);
 612
 613   // Remove duplicates across both the Angled and System directories.  GCC does
 614   // this and failing to remove duplicates across these two groups breaks
 615   // #include_next.
 616   unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
 617   NumAngled -= NonSystemRemoved;
 618
 619   bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
 620   Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
 621
 622   Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
 623
 624   // If verbose, print the list of directories that will be searched.
 625   if (Verbose) {
 626     llvm::errs() << "#include \"...\" search starts here:\n";
 627     for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
 628       if (i == NumQuoted)
 629         llvm::errs() << "#include <...> search starts here:\n";
 630       StringRef Name = SearchList[i].getName();
 631       const char *Suffix;
 632       if (SearchList[i].isNormalDir())
 633         Suffix = "";
 634       else if (SearchList[i].isFramework())
 635         Suffix = " (framework directory)";
 636       else {
 637         assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
 638         Suffix = " (headermap)";
 639       }
 640       llvm::errs() << " " << Name << Suffix << "\n";
 641     }
 642     llvm::errs() << "End of search list.\n";
 643   }
 644 }
 645
 646 void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
 647                                      const HeaderSearchOptions &HSOpts,
 648                                      const LangOptions &Lang,
 649                                      const llvm::Triple &Triple) {
 650   InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
 651
 652   // Add the user defined entries.
 653   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
 654     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
 655     if (E.IgnoreSysRoot) {
 656       Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
 657     } else {
 658       Init.AddPath(E.Path, E.Group, E.IsFramework);
 659     }
 660   }
 661
 662   Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
 663
 664   for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
 665     Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
 666                                HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
 667
 668   if (HSOpts.UseBuiltinIncludes) {
 669     // Set up the builtin include directory in the module map.
 670     SmallString<128> P = StringRef(HSOpts.ResourceDir);
 671     llvm::sys::path::append(P, "include");
 672     if (const DirectoryEntry *Dir = HS.getFileMgr().getDirectory(P))
 673       HS.getModuleMap().setBuiltinIncludeDir(Dir);
 674   }
 675
 676   Init.Realize(Lang);
 677 }