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/Frontend/Utils.h"
  15 #include "clang/Basic/FileManager.h"
  16 #include "clang/Basic/LangOptions.h"
  17 #include "clang/Basic/Version.h"
  18 #include "clang/Config/config.h" // C_INCLUDE_DIRS
  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/FileSystem.h"
  29 #include "llvm/Support/Path.h"
  30 #include "llvm/Support/raw_ostream.h"
  31
  32 using namespace clang;
  33 using namespace clang::frontend;
  34
  35 namespace {
  36
  37 /// InitHeaderSearch - This class makes it easier to set the search paths of
  38 ///  a HeaderSearch object. InitHeaderSearch stores several search path lists
  39 ///  internally, which can be sent to a HeaderSearch object in one swoop.
  40 class InitHeaderSearch {
  41   std::vector<std::pair<IncludeDirGroup, DirectoryLookup> > IncludePath;
  42   typedef std::vector<std::pair<IncludeDirGroup,
  43                       DirectoryLookup> >::const_iterator path_iterator;
  44   std::vector<std::pair<std::string, bool> > SystemHeaderPrefixes;
  45   HeaderSearch &Headers;
  46   bool Verbose;
  47   std::string IncludeSysroot;
  48   bool HasSysroot;
  49
  50 public:
  51
  52   InitHeaderSearch(HeaderSearch &HS, bool verbose, StringRef sysroot)
  53     : Headers(HS), Verbose(verbose), IncludeSysroot(sysroot),
  54       HasSysroot(!(sysroot.empty() || sysroot == "/")) {
  55   }
  56
  57   /// AddPath - Add the specified path to the specified group list, prefixing
  58   /// the sysroot if used.
  59   void AddPath(const Twine &Path, IncludeDirGroup Group, bool isFramework);
  60
  61   /// AddUnmappedPath - Add the specified path to the specified group list,
  62   /// without performing any sysroot remapping.
  63   void AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
  64                        bool isFramework);
  65
  66   /// AddSystemHeaderPrefix - Add the specified prefix to the system header
  67   /// prefix list.
  68   void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
  69     SystemHeaderPrefixes.push_back(std::make_pair(Prefix, IsSystemHeader));
  70   }
  71
  72   /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
  73   ///  libstdc++.
  74   void AddGnuCPlusPlusIncludePaths(StringRef Base,
  75                                    StringRef ArchDir,
  76                                    StringRef Dir32,
  77                                    StringRef Dir64,
  78                                    const llvm::Triple &triple);
  79
  80   /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to support a MinGW
  81   ///  libstdc++.
  82   void AddMinGWCPlusPlusIncludePaths(StringRef Base,
  83                                      StringRef Arch,
  84                                      StringRef Version);
  85
  86   /// AddMinGW64CXXPaths - Add the necessary paths to support
  87   /// libstdc++ of x86_64-w64-mingw32 aka mingw-w64.
  88   void AddMinGW64CXXPaths(StringRef Base,
  89                           StringRef Version);
  90
  91   // AddDefaultCIncludePaths - Add paths that should always be searched.
  92   void AddDefaultCIncludePaths(const llvm::Triple &triple,
  93                                const HeaderSearchOptions &HSOpts);
  94
  95   // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
  96   //  compiling c++.
  97   void AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple,
  98                                        const HeaderSearchOptions &HSOpts);
  99
 100   /// AddDefaultSystemIncludePaths - Adds the default system include paths so
 101   ///  that e.g. stdio.h is found.
 102   void AddDefaultIncludePaths(const LangOptions &Lang,
 103                               const llvm::Triple &triple,
 104                               const HeaderSearchOptions &HSOpts);
 105
 106   /// Realize - Merges all search path lists into one list and send it to
 107   /// HeaderSearch.
 108   void Realize(const LangOptions &Lang);
 109 };
 110
 111 }  // end anonymous namespace.
 112
 113 static bool CanPrefixSysroot(StringRef Path) {
 114 #if defined(_WIN32)
 115   return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
 116 #else
 117   return llvm::sys::path::is_absolute(Path);
 118 #endif
 119 }
 120
 121 void InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
 122                                bool isFramework) {
 123   // Add the path with sysroot prepended, if desired and this is a system header
 124   // group.
 125   if (HasSysroot) {
 126     SmallString<256> MappedPathStorage;
 127     StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 128     if (CanPrefixSysroot(MappedPathStr)) {
 129       AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
 130       return;
 131     }
 132   }
 133
 134   AddUnmappedPath(Path, Group, isFramework);
 135 }
 136
 137 void InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
 138                                        bool isFramework) {
 139   assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
 140
 141   FileManager &FM = Headers.getFileMgr();
 142   SmallString<256> MappedPathStorage;
 143   StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
 144
 145   // Compute the DirectoryLookup type.
 146   SrcMgr::CharacteristicKind Type;
 147   if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
 148     Type = SrcMgr::C_User;
 149   } else if (Group == ExternCSystem) {
 150     Type = SrcMgr::C_ExternCSystem;
 151   } else {
 152     Type = SrcMgr::C_System;
 153   }
 154
 155   // If the directory exists, add it.
 156   if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
 157     IncludePath.push_back(
 158       std::make_pair(Group, DirectoryLookup(DE, Type, isFramework)));
 159     return;
 160   }
 161
 162   // Check to see if this is an apple-style headermap (which are not allowed to
 163   // be frameworks).
 164   if (!isFramework) {
 165     if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
 166       if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
 167         // It is a headermap, add it to the search path.
 168         IncludePath.push_back(
 169           std::make_pair(Group,
 170                          DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
 171         return;
 172       }
 173     }
 174   }
 175
 176   if (Verbose)
 177     llvm::errs() << "ignoring nonexistent directory \""
 178                  << MappedPathStr << "\"\n";
 179 }
 180
 181 void InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
 182                                                    StringRef ArchDir,
 183                                                    StringRef Dir32,
 184                                                    StringRef Dir64,
 185                                                    const llvm::Triple &triple) {
 186   // Add the base dir
 187   AddPath(Base, CXXSystem, false);
 188
 189   // Add the multilib dirs
 190   llvm::Triple::ArchType arch = triple.getArch();
 191   bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
 192   if (is64bit)
 193     AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
 194   else
 195     AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
 196
 197   // Add the backward dir
 198   AddPath(Base + "/backward", CXXSystem, false);
 199 }
 200
 201 void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
 202                                                      StringRef Arch,
 203                                                      StringRef Version) {
 204   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
 205           CXXSystem, false);
 206   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
 207           CXXSystem, false);
 208   AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
 209           CXXSystem, false);
 210 }
 211
 212 void InitHeaderSearch::AddMinGW64CXXPaths(StringRef Base,
 213                                           StringRef Version) {
 214   // Assumes Base is HeaderSearchOpts' ResourceDir
 215   AddPath(Base + "/../../../include/c++/" + Version,
 216           CXXSystem, false);
 217   AddPath(Base + "/../../../include/c++/" + Version + "/x86_64-w64-mingw32",
 218           CXXSystem, false);
 219   AddPath(Base + "/../../../include/c++/" + Version + "/i686-w64-mingw32",
 220           CXXSystem, false);
 221   AddPath(Base + "/../../../include/c++/" + Version + "/backward",
 222           CXXSystem, false);
 223 }
 224
 225 void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
 226                                             const HeaderSearchOptions &HSOpts) {
 227   llvm::Triple::OSType os = triple.getOS();
 228
 229   if (HSOpts.UseStandardSystemIncludes) {
 230     switch (os) {
 231     case llvm::Triple::FreeBSD:
 232     case llvm::Triple::NetBSD:
 233     case llvm::Triple::OpenBSD:
 234     case llvm::Triple::Bitrig:
 235       break;
 236     default:
 237       // FIXME: temporary hack: hard-coded paths.
 238       AddPath("/usr/local/include", System, false);
 239       break;
 240     }
 241   }
 242
 243   // Builtin includes use #include_next directives and should be positioned
 244   // just prior C include dirs.
 245   if (HSOpts.UseBuiltinIncludes) {
 246     // Ignore the sys root, we *always* look for clang headers relative to
 247     // supplied path.
 248     llvm::sys::Path P(HSOpts.ResourceDir);
 249     P.appendComponent("include");
 250     AddUnmappedPath(P.str(), ExternCSystem, false);
 251   }
 252
 253   // All remaining additions are for system include directories, early exit if
 254   // we aren't using them.
 255   if (!HSOpts.UseStandardSystemIncludes)
 256     return;
 257
 258   // Add dirs specified via 'configure --with-c-include-dirs'.
 259   StringRef CIncludeDirs(C_INCLUDE_DIRS);
 260   if (CIncludeDirs != "") {
 261     SmallVector<StringRef, 5> dirs;
 262     CIncludeDirs.split(dirs, ":");
 263     for (SmallVectorImpl<StringRef>::iterator i = dirs.begin();
 264          i != dirs.end();
 265          ++i)
 266       AddPath(*i, ExternCSystem, false);
 267     return;
 268   }
 269
 270   switch (os) {
 271   case llvm::Triple::Linux:
 272   case llvm::Triple::Win32:
 273     llvm_unreachable("Include management is handled in the driver.");
 274
 275   case llvm::Triple::Haiku:
 276     AddPath("/boot/common/include", System, false);
 277     AddPath("/boot/develop/headers/os", System, false);
 278     AddPath("/boot/develop/headers/os/app", System, false);
 279     AddPath("/boot/develop/headers/os/arch", System, false);
 280     AddPath("/boot/develop/headers/os/device", System, false);
 281     AddPath("/boot/develop/headers/os/drivers", System, false);
 282     AddPath("/boot/develop/headers/os/game", System, false);
 283     AddPath("/boot/develop/headers/os/interface", System, false);
 284     AddPath("/boot/develop/headers/os/kernel", System, false);
 285     AddPath("/boot/develop/headers/os/locale", System, false);
 286     AddPath("/boot/develop/headers/os/mail", System, false);
 287     AddPath("/boot/develop/headers/os/media", System, false);
 288     AddPath("/boot/develop/headers/os/midi", System, false);
 289     AddPath("/boot/develop/headers/os/midi2", System, false);
 290     AddPath("/boot/develop/headers/os/net", System, false);
 291     AddPath("/boot/develop/headers/os/storage", System, false);
 292     AddPath("/boot/develop/headers/os/support", System, false);
 293     AddPath("/boot/develop/headers/os/translation", System, false);
 294     AddPath("/boot/develop/headers/os/add-ons/graphics", System, false);
 295     AddPath("/boot/develop/headers/os/add-ons/input_server", System, false);
 296     AddPath("/boot/develop/headers/os/add-ons/screen_saver", System, false);
 297     AddPath("/boot/develop/headers/os/add-ons/tracker", System, false);
 298     AddPath("/boot/develop/headers/os/be_apps/Deskbar", System, false);
 299     AddPath("/boot/develop/headers/os/be_apps/NetPositive", System, false);
 300     AddPath("/boot/develop/headers/os/be_apps/Tracker", System, false);
 301     AddPath("/boot/develop/headers/cpp", System, false);
 302     AddPath("/boot/develop/headers/cpp/i586-pc-haiku", System, false);
 303     AddPath("/boot/develop/headers/3rdparty", System, false);
 304     AddPath("/boot/develop/headers/bsd", System, false);
 305     AddPath("/boot/develop/headers/glibc", System, false);
 306     AddPath("/boot/develop/headers/posix", System, false);
 307     AddPath("/boot/develop/headers",  System, false);
 308     break;
 309   case llvm::Triple::RTEMS:
 310     break;
 311   case llvm::Triple::Cygwin:
 312     AddPath("/usr/include/w32api", System, false);
 313     break;
 314   case llvm::Triple::MinGW32: {
 315       // mingw-w64 crt include paths
 316       llvm::sys::Path P(HSOpts.ResourceDir);
 317       P.appendComponent("../../../i686-w64-mingw32/include"); // <sysroot>/i686-w64-mingw32/include
 318       AddPath(P.str(), System, false);
 319       P = llvm::sys::Path(HSOpts.ResourceDir);
 320       P.appendComponent("../../../x86_64-w64-mingw32/include"); // <sysroot>/x86_64-w64-mingw32/include
 321       AddPath(P.str(), System, false);
 322       // mingw.org crt include paths
 323       P = llvm::sys::Path(HSOpts.ResourceDir);
 324       P.appendComponent("../../../include"); // <sysroot>/include
 325       AddPath(P.str(), System, false);
 326       AddPath("/mingw/include", System, false);
 327 #if defined(_WIN32)
 328       AddPath("c:/mingw/include", System, false);
 329 #endif
 330     }
 331     break;
 332   case llvm::Triple::FreeBSD:
 333     AddPath("/usr/include/clang/" CLANG_VERSION_STRING, System, false);
 334     break;
 335
 336   default:
 337     break;
 338   }
 339
 340   if ( os != llvm::Triple::RTEMS )
 341     AddPath("/usr/include", ExternCSystem, false);
 342 }
 343
 344 void InitHeaderSearch::
 345 AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple, const HeaderSearchOptions &HSOpts) {
 346   llvm::Triple::OSType os = triple.getOS();
 347   // FIXME: temporary hack: hard-coded paths.
 348
 349   if (triple.isOSDarwin()) {
 350     switch (triple.getArch()) {
 351     default: break;
 352
 353     case llvm::Triple::ppc:
 354     case llvm::Triple::ppc64:
 355       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 356                                   "powerpc-apple-darwin10", "", "ppc64",
 357                                   triple);
 358       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 359                                   "powerpc-apple-darwin10", "", "ppc64",
 360                                   triple);
 361       break;
 362
 363     case llvm::Triple::x86:
 364     case llvm::Triple::x86_64:
 365       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 366                                   "i686-apple-darwin10", "", "x86_64", triple);
 367       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
 368                                   "i686-apple-darwin8", "", "", triple);
 369       break;
 370
 371     case llvm::Triple::arm:
 372     case llvm::Triple::thumb:
 373       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 374                                   "arm-apple-darwin10", "v7", "", triple);
 375       AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
 376                                   "arm-apple-darwin10", "v6", "", triple);
 377       break;
 378     }
 379     return;
 380   }
 381
 382   switch (os) {
 383   case llvm::Triple::Linux:
 384   case llvm::Triple::Win32:
 385     llvm_unreachable("Include management is handled in the driver.");
 386
 387   case llvm::Triple::Cygwin:
 388     // Cygwin-1.7
 389     AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
 390     AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
 391     // g++-4 / Cygwin-1.5
 392     AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
 393     break;
 394   case llvm::Triple::MinGW32:
 395     // mingw-w64 C++ include paths (i686-w64-mingw32 and x86_64-w64-mingw32)
 396     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.0");
 397     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.1");
 398     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.2");
 399     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.3");
 400     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.5.4");
 401     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.0");
 402     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.1");
 403     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.2");
 404     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.6.3");
 405     AddMinGW64CXXPaths(HSOpts.ResourceDir, "4.7.0");
 406     // mingw.org C++ include paths
 407     AddMinGWCPlusPlusIncludePaths("/mingw/lib/gcc", "mingw32", "4.5.2"); //MSYS
 408 #if defined(_WIN32)
 409     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.6.2");
 410     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.6.1");
 411     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.5.2");
 412     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.5.0");
 413     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.4.0");
 414     AddMinGWCPlusPlusIncludePaths("c:/MinGW/lib/gcc", "mingw32", "4.3.0");
 415 #endif
 416     break;
 417   case llvm::Triple::DragonFly:
 418     if (llvm::sys::fs::exists("/usr/lib/gcc47"))
 419       AddPath("/usr/include/c++/4.7", CXXSystem, false);
 420     else
 421       AddPath("/usr/include/c++/4.4", CXXSystem, false);
 422     break;
 423   case llvm::Triple::FreeBSD:
 424     // FreeBSD 8.0
 425     // FreeBSD 7.3
 426     AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2",
 427                                 "", "", "", triple);
 428     AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2/backward",
 429                                 "", "", "", triple);
 430     break;
 431   case llvm::Triple::OpenBSD: {
 432     std::string t = triple.getTriple();
 433     if (t.substr(0, 6) == "x86_64")
 434       t.replace(0, 6, "amd64");
 435     AddGnuCPlusPlusIncludePaths("/usr/include/g++",
 436                                 t, "", "", triple);
 437     break;
 438   }
 439   case llvm::Triple::Minix:
 440     AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
 441                                 "", "", "", triple);
 442     break;
 443   case llvm::Triple::Solaris:
 444     AddGnuCPlusPlusIncludePaths("/usr/gcc/4.5/include/c++/4.5.2/",
 445                                 "i386-pc-solaris2.11", "", "", triple);
 446     // Solaris - Fall though..
 447   case llvm::Triple::AuroraUX:
 448     // AuroraUX
 449     AddGnuCPlusPlusIncludePaths("/opt/gcc4/include/c++/4.2.4",
 450                                 "i386-pc-solaris2.11", "", "", triple);
 451     break;
 452   default:
 453     break;
 454   }
 455 }
 456
 457 void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
 458                                               const llvm::Triple &triple,
 459                                             const HeaderSearchOptions &HSOpts) {
 460   // NB: This code path is going away. All of the logic is moving into the
 461   // driver which has the information necessary to do target-specific
 462   // selections of default include paths. Each target which moves there will be
 463   // exempted from this logic here until we can delete the entire pile of code.
 464   switch (triple.getOS()) {
 465   default:
 466     break; // Everything else continues to use this routine's logic.
 467
 468   case llvm::Triple::Linux:
 469   case llvm::Triple::Win32:
 470     return;
 471   }
 472
 473   if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
 474       HSOpts.UseStandardSystemIncludes) {
 475     if (HSOpts.UseLibcxx) {
 476       if (triple.isOSDarwin()) {
 477         // On Darwin, libc++ may be installed alongside the compiler in
 478         // lib/c++/v1.
 479         llvm::sys::Path P(HSOpts.ResourceDir);
 480         if (!P.isEmpty()) {
 481           P.eraseComponent();  // Remove version from foo/lib/clang/version
 482           P.eraseComponent();  // Remove clang from foo/lib/clang
 483
 484           // Get foo/lib/c++/v1
 485           P.appendComponent("c++");
 486           P.appendComponent("v1");
 487           AddUnmappedPath(P.str(), CXXSystem, false);
 488         }
 489       }
 490       // On Solaris, include the support directory for things like xlocale and
 491       // fudged system headers.
 492       if (triple.getOS() == llvm::Triple::Solaris)
 493         AddPath("/usr/include/c++/v1/support/solaris", CXXSystem, false);
 494
 495       AddPath("/usr/include/c++/v1", CXXSystem, false);
 496     } else {
 497       AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
 498     }
 499   }
 500
 501   AddDefaultCIncludePaths(triple, HSOpts);
 502
 503   // Add the default framework include paths on Darwin.
 504   if (HSOpts.UseStandardSystemIncludes) {
 505     if (triple.isOSDarwin()) {
 506       AddPath("/System/Library/Frameworks", System, true);
 507       AddPath("/Library/Frameworks", System, true);
 508     }
 509   }
 510 }
 511
 512 /// RemoveDuplicates - If there are duplicate directory entries in the specified
 513 /// search list, remove the later (dead) ones.  Returns the number of non-system
 514 /// headers removed, which is used to update NumAngled.
 515 static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
 516                                  unsigned First, bool Verbose) {
 517   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
 518   llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
 519   llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
 520   unsigned NonSystemRemoved = 0;
 521   for (unsigned i = First; i != SearchList.size(); ++i) {
 522     unsigned DirToRemove = i;
 523
 524     const DirectoryLookup &CurEntry = SearchList[i];
 525
 526     if (CurEntry.isNormalDir()) {
 527       // If this isn't the first time we've seen this dir, remove it.
 528       if (SeenDirs.insert(CurEntry.getDir()))
 529         continue;
 530     } else if (CurEntry.isFramework()) {
 531       // If this isn't the first time we've seen this framework dir, remove it.
 532       if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()))
 533         continue;
 534     } else {
 535       assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 536       // If this isn't the first time we've seen this headermap, remove it.
 537       if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()))
 538         continue;
 539     }
 540
 541     // If we have a normal #include dir/framework/headermap that is shadowed
 542     // later in the chain by a system include location, we actually want to
 543     // ignore the user's request and drop the user dir... keeping the system
 544     // dir.  This is weird, but required to emulate GCC's search path correctly.
 545     //
 546     // Since dupes of system dirs are rare, just rescan to find the original
 547     // that we're nuking instead of using a DenseMap.
 548     if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
 549       // Find the dir that this is the same of.
 550       unsigned FirstDir;
 551       for (FirstDir = 0; ; ++FirstDir) {
 552         assert(FirstDir != i && "Didn't find dupe?");
 553
 554         const DirectoryLookup &SearchEntry = SearchList[FirstDir];
 555
 556         // If these are different lookup types, then they can't be the dupe.
 557         if (SearchEntry.getLookupType() != CurEntry.getLookupType())
 558           continue;
 559
 560         bool isSame;
 561         if (CurEntry.isNormalDir())
 562           isSame = SearchEntry.getDir() == CurEntry.getDir();
 563         else if (CurEntry.isFramework())
 564           isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
 565         else {
 566           assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
 567           isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
 568         }
 569
 570         if (isSame)
 571           break;
 572       }
 573
 574       // If the first dir in the search path is a non-system dir, zap it
 575       // instead of the system one.
 576       if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
 577         DirToRemove = FirstDir;
 578     }
 579
 580     if (Verbose) {
 581       llvm::errs() << "ignoring duplicate directory \""
 582                    << CurEntry.getName() << "\"\n";
 583       if (DirToRemove != i)
 584         llvm::errs() << "  as it is a non-system directory that duplicates "
 585                      << "a system directory\n";
 586     }
 587     if (DirToRemove != i)
 588       ++NonSystemRemoved;
 589
 590     // This is reached if the current entry is a duplicate.  Remove the
 591     // DirToRemove (usually the current dir).
 592     SearchList.erase(SearchList.begin()+DirToRemove);
 593     --i;
 594   }
 595   return NonSystemRemoved;
 596 }
 597
 598
 599 void InitHeaderSearch::Realize(const LangOptions &Lang) {
 600   // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
 601   std::vector<DirectoryLookup> SearchList;
 602   SearchList.reserve(IncludePath.size());
 603
 604   // Quoted arguments go first.
 605   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 606        it != ie; ++it) {
 607     if (it->first == Quoted)
 608       SearchList.push_back(it->second);
 609   }
 610   // Deduplicate and remember index.
 611   RemoveDuplicates(SearchList, 0, Verbose);
 612   unsigned NumQuoted = SearchList.size();
 613
 614   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 615        it != ie; ++it) {
 616     if (it->first == Angled || it->first == IndexHeaderMap)
 617       SearchList.push_back(it->second);
 618   }
 619
 620   RemoveDuplicates(SearchList, NumQuoted, Verbose);
 621   unsigned NumAngled = SearchList.size();
 622
 623   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 624        it != ie; ++it) {
 625     if (it->first == System || it->first == ExternCSystem ||
 626         (!Lang.ObjC1 && !Lang.CPlusPlus && it->first == CSystem)    ||
 627         (/*FIXME !Lang.ObjC1 && */Lang.CPlusPlus  && it->first == CXXSystem)  ||
 628         (Lang.ObjC1  && !Lang.CPlusPlus && it->first == ObjCSystem) ||
 629         (Lang.ObjC1  && Lang.CPlusPlus  && it->first == ObjCXXSystem))
 630       SearchList.push_back(it->second);
 631   }
 632
 633   for (path_iterator it = IncludePath.begin(), ie = IncludePath.end();
 634        it != ie; ++it) {
 635     if (it->first == After)
 636       SearchList.push_back(it->second);
 637   }
 638
 639   // Remove duplicates across both the Angled and System directories.  GCC does
 640   // this and failing to remove duplicates across these two groups breaks
 641   // #include_next.
 642   unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
 643   NumAngled -= NonSystemRemoved;
 644
 645   bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
 646   Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
 647
 648   Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
 649
 650   // If verbose, print the list of directories that will be searched.
 651   if (Verbose) {
 652     llvm::errs() << "#include \"...\" search starts here:\n";
 653     for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
 654       if (i == NumQuoted)
 655         llvm::errs() << "#include <...> search starts here:\n";
 656       const char *Name = SearchList[i].getName();
 657       const char *Suffix;
 658       if (SearchList[i].isNormalDir())
 659         Suffix = "";
 660       else if (SearchList[i].isFramework())
 661         Suffix = " (framework directory)";
 662       else {
 663         assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
 664         Suffix = " (headermap)";
 665       }
 666       llvm::errs() << " " << Name << Suffix << "\n";
 667     }
 668     llvm::errs() << "End of search list.\n";
 669   }
 670 }
 671
 672 void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
 673                                      const HeaderSearchOptions &HSOpts,
 674                                      const LangOptions &Lang,
 675                                      const llvm::Triple &Triple) {
 676   InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
 677
 678   // Add the user defined entries.
 679   for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
 680     const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
 681     if (E.IgnoreSysRoot) {
 682       Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
 683     } else {
 684       Init.AddPath(E.Path, E.Group, E.IsFramework);
 685     }
 686   }
 687
 688   Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
 689
 690   for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
 691     Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
 692                                HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
 693
 694   if (HSOpts.UseBuiltinIncludes) {
 695     // Set up the builtin include directory in the module map.
 696     llvm::sys::Path P(HSOpts.ResourceDir);
 697     P.appendComponent("include");
 698     if (const DirectoryEntry *Dir = HS.getFileMgr().getDirectory(P.str()))
 699       HS.getModuleMap().setBuiltinIncludeDir(Dir);
 700   }
 701
 702   Init.Realize(Lang);
 703 }