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/Config/config.h" // C_INCLUDE_DIRS
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/FileSystem.h"
29#include "llvm/Support/Path.h"
30#include "llvm/Support/raw_ostream.h"
31
32using namespace clang;
33using namespace clang::frontend;
34
35namespace {
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.
40class 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
50public:
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.emplace_back(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  // AddDefaultCIncludePaths - Add paths that should always be searched.
87  void AddDefaultCIncludePaths(const llvm::Triple &triple,
88                               const HeaderSearchOptions &HSOpts);
89
90  // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
91  //  compiling c++.
92  void AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple,
93                                       const HeaderSearchOptions &HSOpts);
94
95  /// AddDefaultSystemIncludePaths - Adds the default system include paths so
96  ///  that e.g. stdio.h is found.
97  void AddDefaultIncludePaths(const LangOptions &Lang,
98                              const llvm::Triple &triple,
99                              const HeaderSearchOptions &HSOpts);
100
101  /// Realize - Merges all search path lists into one list and send it to
102  /// HeaderSearch.
103  void Realize(const LangOptions &Lang);
104};
105
106}  // end anonymous namespace.
107
108static bool CanPrefixSysroot(StringRef Path) {
109#if defined(LLVM_ON_WIN32)
110  return !Path.empty() && llvm::sys::path::is_separator(Path[0]);
111#else
112  return llvm::sys::path::is_absolute(Path);
113#endif
114}
115
116void InitHeaderSearch::AddPath(const Twine &Path, IncludeDirGroup Group,
117                               bool isFramework) {
118  // Add the path with sysroot prepended, if desired and this is a system header
119  // group.
120  if (HasSysroot) {
121    SmallString<256> MappedPathStorage;
122    StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
123    if (CanPrefixSysroot(MappedPathStr)) {
124      AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
125      return;
126    }
127  }
128
129  AddUnmappedPath(Path, Group, isFramework);
130}
131
132void InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
133                                       bool isFramework) {
134  assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
135
136  FileManager &FM = Headers.getFileMgr();
137  SmallString<256> MappedPathStorage;
138  StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
139
140  // Compute the DirectoryLookup type.
141  SrcMgr::CharacteristicKind Type;
142  if (Group == Quoted || Group == Angled || Group == IndexHeaderMap) {
143    Type = SrcMgr::C_User;
144  } else if (Group == ExternCSystem) {
145    Type = SrcMgr::C_ExternCSystem;
146  } else {
147    Type = SrcMgr::C_System;
148  }
149
150  // If the directory exists, add it.
151  if (const DirectoryEntry *DE = FM.getDirectory(MappedPathStr)) {
152    IncludePath.push_back(
153      std::make_pair(Group, DirectoryLookup(DE, Type, isFramework)));
154    return;
155  }
156
157  // Check to see if this is an apple-style headermap (which are not allowed to
158  // be frameworks).
159  if (!isFramework) {
160    if (const FileEntry *FE = FM.getFile(MappedPathStr)) {
161      if (const HeaderMap *HM = Headers.CreateHeaderMap(FE)) {
162        // It is a headermap, add it to the search path.
163        IncludePath.push_back(
164          std::make_pair(Group,
165                         DirectoryLookup(HM, Type, Group == IndexHeaderMap)));
166        return;
167      }
168    }
169  }
170
171  if (Verbose)
172    llvm::errs() << "ignoring nonexistent directory \""
173                 << MappedPathStr << "\"\n";
174}
175
176void InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
177                                                   StringRef ArchDir,
178                                                   StringRef Dir32,
179                                                   StringRef Dir64,
180                                                   const llvm::Triple &triple) {
181  // Add the base dir
182  AddPath(Base, CXXSystem, false);
183
184  // Add the multilib dirs
185  llvm::Triple::ArchType arch = triple.getArch();
186  bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
187  if (is64bit)
188    AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
189  else
190    AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
191
192  // Add the backward dir
193  AddPath(Base + "/backward", CXXSystem, false);
194}
195
196void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
197                                                     StringRef Arch,
198                                                     StringRef Version) {
199  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
200          CXXSystem, false);
201  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
202          CXXSystem, false);
203  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
204          CXXSystem, false);
205}
206
207void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
208                                            const HeaderSearchOptions &HSOpts) {
209  llvm::Triple::OSType os = triple.getOS();
210
211  if (HSOpts.UseStandardSystemIncludes) {
212    switch (os) {
213    case llvm::Triple::CloudABI:
214    case llvm::Triple::FreeBSD:
215    case llvm::Triple::NetBSD:
216    case llvm::Triple::OpenBSD:
217    case llvm::Triple::Bitrig:
218    case llvm::Triple::NaCl:
219    case llvm::Triple::PS4:
220    case llvm::Triple::ELFIAMCU:
221      break;
222    case llvm::Triple::Win32:
223      if (triple.getEnvironment() != llvm::Triple::Cygnus)
224        break;
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  }
348  default:
349    AddPath("/usr/include", ExternCSystem, false);
350    break;
351  }
352}
353
354void InitHeaderSearch::
355AddDefaultCPlusPlusIncludePaths(const llvm::Triple &triple, const HeaderSearchOptions &HSOpts) {
356  llvm::Triple::OSType os = triple.getOS();
357  // FIXME: temporary hack: hard-coded paths.
358
359  if (triple.isOSDarwin()) {
360    switch (triple.getArch()) {
361    default: break;
362
363    case llvm::Triple::ppc:
364    case llvm::Triple::ppc64:
365      AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
366                                  "powerpc-apple-darwin10", "", "ppc64",
367                                  triple);
368      AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
369                                  "powerpc-apple-darwin10", "", "ppc64",
370                                  triple);
371      break;
372
373    case llvm::Triple::x86:
374    case llvm::Triple::x86_64:
375      AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
376                                  "i686-apple-darwin10", "", "x86_64", triple);
377      AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.0.0",
378                                  "i686-apple-darwin8", "", "", triple);
379      break;
380
381    case llvm::Triple::arm:
382    case llvm::Triple::thumb:
383      AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
384                                  "arm-apple-darwin10", "v7", "", triple);
385      AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
386                                  "arm-apple-darwin10", "v6", "", triple);
387      break;
388
389    case llvm::Triple::aarch64:
390      AddGnuCPlusPlusIncludePaths("/usr/include/c++/4.2.1",
391                                  "arm64-apple-darwin10", "", "", triple);
392      break;
393    }
394    return;
395  }
396
397  switch (os) {
398  case llvm::Triple::Linux:
399    llvm_unreachable("Include management is handled in the driver.");
400    break;
401  case llvm::Triple::Win32:
402    switch (triple.getEnvironment()) {
403    default: llvm_unreachable("Include management is handled in the driver.");
404    case llvm::Triple::Cygnus:
405      // Cygwin-1.7
406      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
407      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
408      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
409      // g++-4 / Cygwin-1.5
410      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
411      break;
412    }
413    break;
414  case llvm::Triple::DragonFly:
415    AddPath("/usr/include/c++/5.0", CXXSystem, false);
416    break;
417  case llvm::Triple::OpenBSD: {
418    std::string t = triple.getTriple();
419    if (t.substr(0, 6) == "x86_64")
420      t.replace(0, 6, "amd64");
421    AddGnuCPlusPlusIncludePaths("/usr/include/g++",
422                                t, "", "", triple);
423    break;
424  }
425  case llvm::Triple::Minix:
426    AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
427                                "", "", "", triple);
428    break;
429  default:
430    break;
431  }
432}
433
434void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
435                                              const llvm::Triple &triple,
436                                            const HeaderSearchOptions &HSOpts) {
437  // NB: This code path is going away. All of the logic is moving into the
438  // driver which has the information necessary to do target-specific
439  // selections of default include paths. Each target which moves there will be
440  // exempted from this logic here until we can delete the entire pile of code.
441  switch (triple.getOS()) {
442  default:
443    break; // Everything else continues to use this routine's logic.
444
445  case llvm::Triple::Linux:
446    return;
447
448  case llvm::Triple::Win32:
449    if (triple.getEnvironment() != llvm::Triple::Cygnus ||
450        triple.isOSBinFormatMachO())
451      return;
452    break;
453  }
454
455  if (Lang.CPlusPlus && HSOpts.UseStandardCXXIncludes &&
456      HSOpts.UseStandardSystemIncludes) {
457    if (HSOpts.UseLibcxx) {
458      if (triple.isOSDarwin()) {
459        // On Darwin, libc++ may be installed alongside the compiler in
460        // include/c++/v1.
461        if (!HSOpts.ResourceDir.empty()) {
462          // Remove version from foo/lib/clang/version
463          StringRef NoVer = llvm::sys::path::parent_path(HSOpts.ResourceDir);
464          // Remove clang from foo/lib/clang
465          StringRef Lib = llvm::sys::path::parent_path(NoVer);
466          // Remove lib from foo/lib
467          SmallString<128> P = llvm::sys::path::parent_path(Lib);
468
469          // Get foo/include/c++/v1
470          llvm::sys::path::append(P, "include", "c++", "v1");
471          AddUnmappedPath(P, CXXSystem, false);
472        }
473      }
474      AddPath("/usr/include/c++/v1", CXXSystem, false);
475    } else {
476      AddDefaultCPlusPlusIncludePaths(triple, HSOpts);
477    }
478  }
479
480  AddDefaultCIncludePaths(triple, HSOpts);
481
482  // Add the default framework include paths on Darwin.
483  if (HSOpts.UseStandardSystemIncludes) {
484    if (triple.isOSDarwin()) {
485      AddPath("/System/Library/Frameworks", System, true);
486      AddPath("/Library/Frameworks", System, true);
487    }
488  }
489}
490
491/// RemoveDuplicates - If there are duplicate directory entries in the specified
492/// search list, remove the later (dead) ones.  Returns the number of non-system
493/// headers removed, which is used to update NumAngled.
494static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
495                                 unsigned First, bool Verbose) {
496  llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
497  llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
498  llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
499  unsigned NonSystemRemoved = 0;
500  for (unsigned i = First; i != SearchList.size(); ++i) {
501    unsigned DirToRemove = i;
502
503    const DirectoryLookup &CurEntry = SearchList[i];
504
505    if (CurEntry.isNormalDir()) {
506      // If this isn't the first time we've seen this dir, remove it.
507      if (SeenDirs.insert(CurEntry.getDir()).second)
508        continue;
509    } else if (CurEntry.isFramework()) {
510      // If this isn't the first time we've seen this framework dir, remove it.
511      if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
512        continue;
513    } else {
514      assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
515      // If this isn't the first time we've seen this headermap, remove it.
516      if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
517        continue;
518    }
519
520    // If we have a normal #include dir/framework/headermap that is shadowed
521    // later in the chain by a system include location, we actually want to
522    // ignore the user's request and drop the user dir... keeping the system
523    // dir.  This is weird, but required to emulate GCC's search path correctly.
524    //
525    // Since dupes of system dirs are rare, just rescan to find the original
526    // that we're nuking instead of using a DenseMap.
527    if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
528      // Find the dir that this is the same of.
529      unsigned FirstDir;
530      for (FirstDir = 0; ; ++FirstDir) {
531        assert(FirstDir != i && "Didn't find dupe?");
532
533        const DirectoryLookup &SearchEntry = SearchList[FirstDir];
534
535        // If these are different lookup types, then they can't be the dupe.
536        if (SearchEntry.getLookupType() != CurEntry.getLookupType())
537          continue;
538
539        bool isSame;
540        if (CurEntry.isNormalDir())
541          isSame = SearchEntry.getDir() == CurEntry.getDir();
542        else if (CurEntry.isFramework())
543          isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
544        else {
545          assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
546          isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
547        }
548
549        if (isSame)
550          break;
551      }
552
553      // If the first dir in the search path is a non-system dir, zap it
554      // instead of the system one.
555      if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
556        DirToRemove = FirstDir;
557    }
558
559    if (Verbose) {
560      llvm::errs() << "ignoring duplicate directory \""
561                   << CurEntry.getName() << "\"\n";
562      if (DirToRemove != i)
563        llvm::errs() << "  as it is a non-system directory that duplicates "
564                     << "a system directory\n";
565    }
566    if (DirToRemove != i)
567      ++NonSystemRemoved;
568
569    // This is reached if the current entry is a duplicate.  Remove the
570    // DirToRemove (usually the current dir).
571    SearchList.erase(SearchList.begin()+DirToRemove);
572    --i;
573  }
574  return NonSystemRemoved;
575}
576
577
578void InitHeaderSearch::Realize(const LangOptions &Lang) {
579  // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
580  std::vector<DirectoryLookup> SearchList;
581  SearchList.reserve(IncludePath.size());
582
583  // Quoted arguments go first.
584  for (auto &Include : IncludePath)
585    if (Include.first == Quoted)
586      SearchList.push_back(Include.second);
587
588  // Deduplicate and remember index.
589  RemoveDuplicates(SearchList, 0, Verbose);
590  unsigned NumQuoted = SearchList.size();
591
592  for (auto &Include : IncludePath)
593    if (Include.first == Angled || Include.first == IndexHeaderMap)
594      SearchList.push_back(Include.second);
595
596  RemoveDuplicates(SearchList, NumQuoted, Verbose);
597  unsigned NumAngled = SearchList.size();
598
599  for (auto &Include : IncludePath)
600    if (Include.first == System || Include.first == ExternCSystem ||
601        (!Lang.ObjC1 && !Lang.CPlusPlus && Include.first == CSystem) ||
602        (/*FIXME !Lang.ObjC1 && */ Lang.CPlusPlus &&
603         Include.first == CXXSystem) ||
604        (Lang.ObjC1 && !Lang.CPlusPlus && Include.first == ObjCSystem) ||
605        (Lang.ObjC1 && Lang.CPlusPlus && Include.first == ObjCXXSystem))
606      SearchList.push_back(Include.second);
607
608  for (auto &Include : IncludePath)
609    if (Include.first == After)
610      SearchList.push_back(Include.second);
611
612  // Remove duplicates across both the Angled and System directories.  GCC does
613  // this and failing to remove duplicates across these two groups breaks
614  // #include_next.
615  unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
616  NumAngled -= NonSystemRemoved;
617
618  bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
619  Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
620
621  Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
622
623  // If verbose, print the list of directories that will be searched.
624  if (Verbose) {
625    llvm::errs() << "#include \"...\" search starts here:\n";
626    for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
627      if (i == NumQuoted)
628        llvm::errs() << "#include <...> search starts here:\n";
629      const char *Name = SearchList[i].getName();
630      const char *Suffix;
631      if (SearchList[i].isNormalDir())
632        Suffix = "";
633      else if (SearchList[i].isFramework())
634        Suffix = " (framework directory)";
635      else {
636        assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
637        Suffix = " (headermap)";
638      }
639      llvm::errs() << " " << Name << Suffix << "\n";
640    }
641    llvm::errs() << "End of search list.\n";
642  }
643}
644
645void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
646                                     const HeaderSearchOptions &HSOpts,
647                                     const LangOptions &Lang,
648                                     const llvm::Triple &Triple) {
649  InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
650
651  // Add the user defined entries.
652  for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
653    const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
654    if (E.IgnoreSysRoot) {
655      Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
656    } else {
657      Init.AddPath(E.Path, E.Group, E.IsFramework);
658    }
659  }
660
661  Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
662
663  for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
664    Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
665                               HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
666
667  if (HSOpts.UseBuiltinIncludes) {
668    // Set up the builtin include directory in the module map.
669    SmallString<128> P = StringRef(HSOpts.ResourceDir);
670    llvm::sys::path::append(P, "include");
671    if (const DirectoryEntry *Dir = HS.getFileMgr().getDirectory(P))
672      HS.getModuleMap().setBuiltinIncludeDir(Dir);
673  }
674
675  Init.Realize(Lang);
676}
677