1//===--- InitHeaderSearch.cpp - Initialize header search paths ------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the InitHeaderSearch class.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Basic/FileManager.h"
14#include "clang/Basic/LangOptions.h"
15#include "clang/Config/config.h" // C_INCLUDE_DIRS
16#include "clang/Frontend/FrontendDiagnostic.h"
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
31using namespace clang;
32using namespace clang::frontend;
33
34namespace {
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.
39class 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
49public:
50  InitHeaderSearch(HeaderSearch &HS, bool verbose, StringRef sysroot)
51      : Headers(HS), Verbose(verbose), IncludeSysroot(std::string(sysroot)),
52        HasSysroot(!(sysroot.empty() || sysroot == "/")) {}
53
54  /// AddPath - Add the specified path to the specified group list, prefixing
55  /// the sysroot if used.
56  /// Returns true if the path exists, false if it was ignored.
57  bool AddPath(const Twine &Path, IncludeDirGroup Group, bool isFramework);
58
59  /// AddUnmappedPath - Add the specified path to the specified group list,
60  /// without performing any sysroot remapping.
61  /// Returns true if the path exists, false if it was ignored.
62  bool 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(std::string(Prefix), IsSystemHeader);
69  }
70
71  /// AddGnuCPlusPlusIncludePaths - Add the necessary paths to support a gnu
72  ///  libstdc++.
73  /// Returns true if the \p Base path was found, false if it does not exist.
74  bool AddGnuCPlusPlusIncludePaths(StringRef Base, StringRef ArchDir,
75                                   StringRef Dir32, StringRef Dir64,
76                                   const llvm::Triple &triple);
77
78  /// AddMinGWCPlusPlusIncludePaths - Add the necessary paths to support a MinGW
79  ///  libstdc++.
80  void AddMinGWCPlusPlusIncludePaths(StringRef Base,
81                                     StringRef Arch,
82                                     StringRef Version);
83
84  // AddDefaultCIncludePaths - Add paths that should always be searched.
85  void AddDefaultCIncludePaths(const llvm::Triple &triple,
86                               const HeaderSearchOptions &HSOpts);
87
88  // AddDefaultCPlusPlusIncludePaths -  Add paths that should be searched when
89  //  compiling c++.
90  void AddDefaultCPlusPlusIncludePaths(const LangOptions &LangOpts,
91                                       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
107static bool CanPrefixSysroot(StringRef Path) {
108#if defined(_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
115bool 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      return AddUnmappedPath(IncludeSysroot + Path, Group, isFramework);
124    }
125  }
126
127  return AddUnmappedPath(Path, Group, isFramework);
128}
129
130bool InitHeaderSearch::AddUnmappedPath(const Twine &Path, IncludeDirGroup Group,
131                                       bool isFramework) {
132  assert(!Path.isTriviallyEmpty() && "can't handle empty path here");
133
134  FileManager &FM = Headers.getFileMgr();
135  SmallString<256> MappedPathStorage;
136  StringRef MappedPathStr = Path.toStringRef(MappedPathStorage);
137
138  // If use system headers while cross-compiling, emit the warning.
139  if (HasSysroot && (MappedPathStr.startswith("/usr/include") ||
140                     MappedPathStr.startswith("/usr/local/include"))) {
141    Headers.getDiags().Report(diag::warn_poison_system_directories)
142        << MappedPathStr;
143  }
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 (auto DE = FM.getOptionalDirectoryRef(MappedPathStr)) {
157    IncludePath.push_back(
158      std::make_pair(Group, DirectoryLookup(*DE, Type, isFramework)));
159    return true;
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 (auto 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 true;
172      }
173    }
174  }
175
176  if (Verbose)
177    llvm::errs() << "ignoring nonexistent directory \""
178                 << MappedPathStr << "\"\n";
179  return false;
180}
181
182bool InitHeaderSearch::AddGnuCPlusPlusIncludePaths(StringRef Base,
183                                                   StringRef ArchDir,
184                                                   StringRef Dir32,
185                                                   StringRef Dir64,
186                                                   const llvm::Triple &triple) {
187  // Add the base dir
188  bool IsBaseFound = AddPath(Base, CXXSystem, false);
189
190  // Add the multilib dirs
191  llvm::Triple::ArchType arch = triple.getArch();
192  bool is64bit = arch == llvm::Triple::ppc64 || arch == llvm::Triple::x86_64;
193  if (is64bit)
194    AddPath(Base + "/" + ArchDir + "/" + Dir64, CXXSystem, false);
195  else
196    AddPath(Base + "/" + ArchDir + "/" + Dir32, CXXSystem, false);
197
198  // Add the backward dir
199  AddPath(Base + "/backward", CXXSystem, false);
200  return IsBaseFound;
201}
202
203void InitHeaderSearch::AddMinGWCPlusPlusIncludePaths(StringRef Base,
204                                                     StringRef Arch,
205                                                     StringRef Version) {
206  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++",
207          CXXSystem, false);
208  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/" + Arch,
209          CXXSystem, false);
210  AddPath(Base + "/" + Arch + "/" + Version + "/include/c++/backward",
211          CXXSystem, false);
212}
213
214void InitHeaderSearch::AddDefaultCIncludePaths(const llvm::Triple &triple,
215                                            const HeaderSearchOptions &HSOpts) {
216  llvm::Triple::OSType os = triple.getOS();
217
218  if (triple.isOSDarwin()) {
219    llvm_unreachable("Include management is handled in the driver.");
220  }
221
222  if (HSOpts.UseStandardSystemIncludes) {
223    switch (os) {
224    case llvm::Triple::CloudABI:
225    case llvm::Triple::FreeBSD:
226    case llvm::Triple::NetBSD:
227    case llvm::Triple::OpenBSD:
228    case llvm::Triple::NaCl:
229    case llvm::Triple::PS4:
230    case llvm::Triple::ELFIAMCU:
231    case llvm::Triple::Fuchsia:
232      break;
233    case llvm::Triple::Win32:
234      if (triple.getEnvironment() != llvm::Triple::Cygnus)
235        break;
236      LLVM_FALLTHROUGH;
237    default:
238      // FIXME: temporary hack: hard-coded paths.
239      AddPath("/usr/local/include", System, false);
240      break;
241    }
242  }
243
244  // Builtin includes use #include_next directives and should be positioned
245  // just prior C include dirs.
246  if (HSOpts.UseBuiltinIncludes) {
247    // Ignore the sys root, we *always* look for clang headers relative to
248    // supplied path.
249    SmallString<128> P = StringRef(HSOpts.ResourceDir);
250    llvm::sys::path::append(P, "include");
251    AddUnmappedPath(P, ExternCSystem, false);
252  }
253
254  // All remaining additions are for system include directories, early exit if
255  // we aren't using them.
256  if (!HSOpts.UseStandardSystemIncludes)
257    return;
258
259  // Add dirs specified via 'configure --with-c-include-dirs'.
260  StringRef CIncludeDirs(C_INCLUDE_DIRS);
261  if (CIncludeDirs != "") {
262    SmallVector<StringRef, 5> dirs;
263    CIncludeDirs.split(dirs, ":");
264    for (StringRef dir : dirs)
265      AddPath(dir, ExternCSystem, false);
266    return;
267  }
268
269  switch (os) {
270  case llvm::Triple::Linux:
271  case llvm::Triple::Hurd:
272  case llvm::Triple::Solaris:
273  case llvm::Triple::OpenBSD:
274    llvm_unreachable("Include management is handled in the driver.");
275
276  case llvm::Triple::CloudABI: {
277    // <sysroot>/<triple>/include
278    SmallString<128> P = StringRef(HSOpts.ResourceDir);
279    llvm::sys::path::append(P, "../../..", triple.str(), "include");
280    AddPath(P, System, false);
281    break;
282  }
283
284  case llvm::Triple::Haiku:
285    AddPath("/boot/system/non-packaged/develop/headers", System, false);
286    AddPath("/boot/system/develop/headers/os", System, false);
287    AddPath("/boot/system/develop/headers/os/app", System, false);
288    AddPath("/boot/system/develop/headers/os/arch", System, false);
289    AddPath("/boot/system/develop/headers/os/device", System, false);
290    AddPath("/boot/system/develop/headers/os/drivers", System, false);
291    AddPath("/boot/system/develop/headers/os/game", System, false);
292    AddPath("/boot/system/develop/headers/os/interface", System, false);
293    AddPath("/boot/system/develop/headers/os/kernel", System, false);
294    AddPath("/boot/system/develop/headers/os/locale", System, false);
295    AddPath("/boot/system/develop/headers/os/mail", System, false);
296    AddPath("/boot/system/develop/headers/os/media", System, false);
297    AddPath("/boot/system/develop/headers/os/midi", System, false);
298    AddPath("/boot/system/develop/headers/os/midi2", System, false);
299    AddPath("/boot/system/develop/headers/os/net", System, false);
300    AddPath("/boot/system/develop/headers/os/opengl", System, false);
301    AddPath("/boot/system/develop/headers/os/storage", System, false);
302    AddPath("/boot/system/develop/headers/os/support", System, false);
303    AddPath("/boot/system/develop/headers/os/translation", System, false);
304    AddPath("/boot/system/develop/headers/os/add-ons/graphics", System, false);
305    AddPath("/boot/system/develop/headers/os/add-ons/input_server", System, false);
306    AddPath("/boot/system/develop/headers/os/add-ons/mail_daemon", System, false);
307    AddPath("/boot/system/develop/headers/os/add-ons/registrar", System, false);
308    AddPath("/boot/system/develop/headers/os/add-ons/screen_saver", System, false);
309    AddPath("/boot/system/develop/headers/os/add-ons/tracker", System, false);
310    AddPath("/boot/system/develop/headers/os/be_apps/Deskbar", System, false);
311    AddPath("/boot/system/develop/headers/os/be_apps/NetPositive", System, false);
312    AddPath("/boot/system/develop/headers/os/be_apps/Tracker", System, false);
313    AddPath("/boot/system/develop/headers/3rdparty", System, false);
314    AddPath("/boot/system/develop/headers/bsd", System, false);
315    AddPath("/boot/system/develop/headers/glibc", System, false);
316    AddPath("/boot/system/develop/headers/posix", System, false);
317    AddPath("/boot/system/develop/headers",  System, false);
318    break;
319  case llvm::Triple::RTEMS:
320    break;
321  case llvm::Triple::Win32:
322    switch (triple.getEnvironment()) {
323    default: llvm_unreachable("Include management is handled in the driver.");
324    case llvm::Triple::Cygnus:
325      AddPath("/usr/include/w32api", System, false);
326      break;
327    case llvm::Triple::GNU:
328      break;
329    }
330    break;
331  default:
332    break;
333  }
334
335  switch (os) {
336  case llvm::Triple::CloudABI:
337  case llvm::Triple::RTEMS:
338  case llvm::Triple::NaCl:
339  case llvm::Triple::ELFIAMCU:
340  case llvm::Triple::Fuchsia:
341    break;
342  case llvm::Triple::PS4: {
343    // <isysroot> gets prepended later in AddPath().
344    std::string BaseSDKPath = "";
345    if (!HasSysroot) {
346      const char *envValue = getenv("SCE_ORBIS_SDK_DIR");
347      if (envValue)
348        BaseSDKPath = envValue;
349      else {
350        // HSOpts.ResourceDir variable contains the location of Clang's
351        // resource files.
352        // Assuming that Clang is configured for PS4 without
353        // --with-clang-resource-dir option, the location of Clang's resource
354        // files is <SDK_DIR>/host_tools/lib/clang
355        SmallString<128> P = StringRef(HSOpts.ResourceDir);
356        llvm::sys::path::append(P, "../../..");
357        BaseSDKPath = std::string(P.str());
358      }
359    }
360    AddPath(BaseSDKPath + "/target/include", System, false);
361    if (triple.isPS4CPU())
362      AddPath(BaseSDKPath + "/target/include_common", System, false);
363    LLVM_FALLTHROUGH;
364  }
365  default:
366    AddPath("/usr/include", ExternCSystem, false);
367    break;
368  }
369}
370
371void InitHeaderSearch::AddDefaultCPlusPlusIncludePaths(
372    const LangOptions &LangOpts, const llvm::Triple &triple,
373    const HeaderSearchOptions &HSOpts) {
374  llvm::Triple::OSType os = triple.getOS();
375  // FIXME: temporary hack: hard-coded paths.
376
377  if (triple.isOSDarwin()) {
378    llvm_unreachable("Include management is handled in the driver.");
379  }
380
381  switch (os) {
382  case llvm::Triple::Linux:
383  case llvm::Triple::Hurd:
384  case llvm::Triple::Solaris:
385  case llvm::Triple::AIX:
386    llvm_unreachable("Include management is handled in the driver.");
387    break;
388  case llvm::Triple::Win32:
389    switch (triple.getEnvironment()) {
390    default: llvm_unreachable("Include management is handled in the driver.");
391    case llvm::Triple::Cygnus:
392      // Cygwin-1.7
393      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.7.3");
394      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.5.3");
395      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.4");
396      // g++-4 / Cygwin-1.5
397      AddMinGWCPlusPlusIncludePaths("/usr/lib/gcc", "i686-pc-cygwin", "4.3.2");
398      break;
399    }
400    break;
401  case llvm::Triple::DragonFly:
402    AddPath("/usr/include/c++/5.0", CXXSystem, false);
403    break;
404  case llvm::Triple::Minix:
405    AddGnuCPlusPlusIncludePaths("/usr/gnu/include/c++/4.4.3",
406                                "", "", "", triple);
407    break;
408  default:
409    break;
410  }
411}
412
413void InitHeaderSearch::AddDefaultIncludePaths(const LangOptions &Lang,
414                                              const llvm::Triple &triple,
415                                            const HeaderSearchOptions &HSOpts) {
416  // NB: This code path is going away. All of the logic is moving into the
417  // driver which has the information necessary to do target-specific
418  // selections of default include paths. Each target which moves there will be
419  // exempted from this logic here until we can delete the entire pile of code.
420  switch (triple.getOS()) {
421  default:
422    break; // Everything else continues to use this routine's logic.
423
424  case llvm::Triple::Emscripten:
425  case llvm::Triple::Linux:
426  case llvm::Triple::Hurd:
427  case llvm::Triple::OpenBSD:
428  case llvm::Triple::Solaris:
429  case llvm::Triple::WASI:
430  case llvm::Triple::AIX:
431    return;
432
433  case llvm::Triple::Win32:
434    if (triple.getEnvironment() != llvm::Triple::Cygnus ||
435        triple.isOSBinFormatMachO())
436      return;
437    break;
438
439  case llvm::Triple::UnknownOS:
440    if (triple.isWasm())
441      return;
442    break;
443  }
444
445  // All header search logic is handled in the Driver for Darwin.
446  if (triple.isOSDarwin()) {
447    if (HSOpts.UseStandardSystemIncludes) {
448      // Add the default framework include paths on Darwin.
449      AddPath("/System/Library/Frameworks", System, true);
450      AddPath("/Library/Frameworks", System, true);
451    }
452    return;
453  }
454
455  if (Lang.CPlusPlus && !Lang.AsmPreprocessor &&
456      HSOpts.UseStandardCXXIncludes && HSOpts.UseStandardSystemIncludes) {
457    if (HSOpts.UseLibcxx) {
458      AddPath("/usr/include/c++/v1", CXXSystem, false);
459    } else {
460      AddDefaultCPlusPlusIncludePaths(Lang, triple, HSOpts);
461    }
462  }
463
464  AddDefaultCIncludePaths(triple, HSOpts);
465}
466
467/// RemoveDuplicates - If there are duplicate directory entries in the specified
468/// search list, remove the later (dead) ones.  Returns the number of non-system
469/// headers removed, which is used to update NumAngled.
470static unsigned RemoveDuplicates(std::vector<DirectoryLookup> &SearchList,
471                                 unsigned First, bool Verbose) {
472  llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenDirs;
473  llvm::SmallPtrSet<const DirectoryEntry *, 8> SeenFrameworkDirs;
474  llvm::SmallPtrSet<const HeaderMap *, 8> SeenHeaderMaps;
475  unsigned NonSystemRemoved = 0;
476  for (unsigned i = First; i != SearchList.size(); ++i) {
477    unsigned DirToRemove = i;
478
479    const DirectoryLookup &CurEntry = SearchList[i];
480
481    if (CurEntry.isNormalDir()) {
482      // If this isn't the first time we've seen this dir, remove it.
483      if (SeenDirs.insert(CurEntry.getDir()).second)
484        continue;
485    } else if (CurEntry.isFramework()) {
486      // If this isn't the first time we've seen this framework dir, remove it.
487      if (SeenFrameworkDirs.insert(CurEntry.getFrameworkDir()).second)
488        continue;
489    } else {
490      assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
491      // If this isn't the first time we've seen this headermap, remove it.
492      if (SeenHeaderMaps.insert(CurEntry.getHeaderMap()).second)
493        continue;
494    }
495
496    // If we have a normal #include dir/framework/headermap that is shadowed
497    // later in the chain by a system include location, we actually want to
498    // ignore the user's request and drop the user dir... keeping the system
499    // dir.  This is weird, but required to emulate GCC's search path correctly.
500    //
501    // Since dupes of system dirs are rare, just rescan to find the original
502    // that we're nuking instead of using a DenseMap.
503    if (CurEntry.getDirCharacteristic() != SrcMgr::C_User) {
504      // Find the dir that this is the same of.
505      unsigned FirstDir;
506      for (FirstDir = First;; ++FirstDir) {
507        assert(FirstDir != i && "Didn't find dupe?");
508
509        const DirectoryLookup &SearchEntry = SearchList[FirstDir];
510
511        // If these are different lookup types, then they can't be the dupe.
512        if (SearchEntry.getLookupType() != CurEntry.getLookupType())
513          continue;
514
515        bool isSame;
516        if (CurEntry.isNormalDir())
517          isSame = SearchEntry.getDir() == CurEntry.getDir();
518        else if (CurEntry.isFramework())
519          isSame = SearchEntry.getFrameworkDir() == CurEntry.getFrameworkDir();
520        else {
521          assert(CurEntry.isHeaderMap() && "Not a headermap or normal dir?");
522          isSame = SearchEntry.getHeaderMap() == CurEntry.getHeaderMap();
523        }
524
525        if (isSame)
526          break;
527      }
528
529      // If the first dir in the search path is a non-system dir, zap it
530      // instead of the system one.
531      if (SearchList[FirstDir].getDirCharacteristic() == SrcMgr::C_User)
532        DirToRemove = FirstDir;
533    }
534
535    if (Verbose) {
536      llvm::errs() << "ignoring duplicate directory \""
537                   << CurEntry.getName() << "\"\n";
538      if (DirToRemove != i)
539        llvm::errs() << "  as it is a non-system directory that duplicates "
540                     << "a system directory\n";
541    }
542    if (DirToRemove != i)
543      ++NonSystemRemoved;
544
545    // This is reached if the current entry is a duplicate.  Remove the
546    // DirToRemove (usually the current dir).
547    SearchList.erase(SearchList.begin()+DirToRemove);
548    --i;
549  }
550  return NonSystemRemoved;
551}
552
553
554void InitHeaderSearch::Realize(const LangOptions &Lang) {
555  // Concatenate ANGLE+SYSTEM+AFTER chains together into SearchList.
556  std::vector<DirectoryLookup> SearchList;
557  SearchList.reserve(IncludePath.size());
558
559  // Quoted arguments go first.
560  for (auto &Include : IncludePath)
561    if (Include.first == Quoted)
562      SearchList.push_back(Include.second);
563
564  // Deduplicate and remember index.
565  RemoveDuplicates(SearchList, 0, Verbose);
566  unsigned NumQuoted = SearchList.size();
567
568  for (auto &Include : IncludePath)
569    if (Include.first == Angled || Include.first == IndexHeaderMap)
570      SearchList.push_back(Include.second);
571
572  RemoveDuplicates(SearchList, NumQuoted, Verbose);
573  unsigned NumAngled = SearchList.size();
574
575  for (auto &Include : IncludePath)
576    if (Include.first == System || Include.first == ExternCSystem ||
577        (!Lang.ObjC && !Lang.CPlusPlus && Include.first == CSystem) ||
578        (/*FIXME !Lang.ObjC && */ Lang.CPlusPlus &&
579         Include.first == CXXSystem) ||
580        (Lang.ObjC && !Lang.CPlusPlus && Include.first == ObjCSystem) ||
581        (Lang.ObjC && Lang.CPlusPlus && Include.first == ObjCXXSystem))
582      SearchList.push_back(Include.second);
583
584  for (auto &Include : IncludePath)
585    if (Include.first == After)
586      SearchList.push_back(Include.second);
587
588  // Remove duplicates across both the Angled and System directories.  GCC does
589  // this and failing to remove duplicates across these two groups breaks
590  // #include_next.
591  unsigned NonSystemRemoved = RemoveDuplicates(SearchList, NumQuoted, Verbose);
592  NumAngled -= NonSystemRemoved;
593
594  bool DontSearchCurDir = false;  // TODO: set to true if -I- is set?
595  Headers.SetSearchPaths(SearchList, NumQuoted, NumAngled, DontSearchCurDir);
596
597  Headers.SetSystemHeaderPrefixes(SystemHeaderPrefixes);
598
599  // If verbose, print the list of directories that will be searched.
600  if (Verbose) {
601    llvm::errs() << "#include \"...\" search starts here:\n";
602    for (unsigned i = 0, e = SearchList.size(); i != e; ++i) {
603      if (i == NumQuoted)
604        llvm::errs() << "#include <...> search starts here:\n";
605      StringRef Name = SearchList[i].getName();
606      const char *Suffix;
607      if (SearchList[i].isNormalDir())
608        Suffix = "";
609      else if (SearchList[i].isFramework())
610        Suffix = " (framework directory)";
611      else {
612        assert(SearchList[i].isHeaderMap() && "Unknown DirectoryLookup");
613        Suffix = " (headermap)";
614      }
615      llvm::errs() << " " << Name << Suffix << "\n";
616    }
617    llvm::errs() << "End of search list.\n";
618  }
619}
620
621void clang::ApplyHeaderSearchOptions(HeaderSearch &HS,
622                                     const HeaderSearchOptions &HSOpts,
623                                     const LangOptions &Lang,
624                                     const llvm::Triple &Triple) {
625  InitHeaderSearch Init(HS, HSOpts.Verbose, HSOpts.Sysroot);
626
627  // Add the user defined entries.
628  for (unsigned i = 0, e = HSOpts.UserEntries.size(); i != e; ++i) {
629    const HeaderSearchOptions::Entry &E = HSOpts.UserEntries[i];
630    if (E.IgnoreSysRoot) {
631      Init.AddUnmappedPath(E.Path, E.Group, E.IsFramework);
632    } else {
633      Init.AddPath(E.Path, E.Group, E.IsFramework);
634    }
635  }
636
637  Init.AddDefaultIncludePaths(Lang, Triple, HSOpts);
638
639  for (unsigned i = 0, e = HSOpts.SystemHeaderPrefixes.size(); i != e; ++i)
640    Init.AddSystemHeaderPrefix(HSOpts.SystemHeaderPrefixes[i].Prefix,
641                               HSOpts.SystemHeaderPrefixes[i].IsSystemHeader);
642
643  if (HSOpts.UseBuiltinIncludes) {
644    // Set up the builtin include directory in the module map.
645    SmallString<128> P = StringRef(HSOpts.ResourceDir);
646    llvm::sys::path::append(P, "include");
647    if (auto Dir = HS.getFileMgr().getDirectory(P))
648      HS.getModuleMap().setBuiltinIncludeDir(*Dir);
649  }
650
651  Init.Realize(Lang);
652}
653