1 //===- HeaderSearch.cpp - Resolve Header File Locations -------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the DirectoryLookup and HeaderSearch interfaces.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Lex/HeaderSearch.h"
15 #include "clang/Basic/Diagnostic.h"
16 #include "clang/Basic/FileManager.h"
17 #include "clang/Basic/IdentifierTable.h"
18 #include "clang/Basic/Module.h"
19 #include "clang/Basic/SourceManager.h"
20 #include "clang/Basic/VirtualFileSystem.h"
21 #include "clang/Lex/DirectoryLookup.h"
22 #include "clang/Lex/ExternalPreprocessorSource.h"
23 #include "clang/Lex/HeaderMap.h"
24 #include "clang/Lex/HeaderSearchOptions.h"
25 #include "clang/Lex/LexDiagnostic.h"
26 #include "clang/Lex/ModuleMap.h"
27 #include "clang/Lex/Preprocessor.h"
28 #include "llvm/ADT/APInt.h"
29 #include "llvm/ADT/Hashing.h"
30 #include "llvm/ADT/SmallString.h"
31 #include "llvm/ADT/SmallVector.h"
32 #include "llvm/ADT/StringRef.h"
33 #include "llvm/Support/Allocator.h"
34 #include "llvm/Support/Capacity.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/FileSystem.h"
37 #include "llvm/Support/Path.h"
44 #include <system_error>
47 using namespace clang;
49 const IdentifierInfo *
50 HeaderFileInfo::getControllingMacro(ExternalPreprocessorSource *External) {
51 if (ControllingMacro) {
52 if (ControllingMacro->isOutOfDate()) {
53 assert(External && "We must have an external source if we have a "
54 "controlling macro that is out of date.");
55 External->updateOutOfDateIdentifier(
56 *const_cast<IdentifierInfo *>(ControllingMacro));
58 return ControllingMacro;
61 if (!ControllingMacroID || !External)
64 ControllingMacro = External->GetIdentifier(ControllingMacroID);
65 return ControllingMacro;
68 ExternalHeaderFileInfoSource::~ExternalHeaderFileInfoSource() = default;
70 HeaderSearch::HeaderSearch(std::shared_ptr<HeaderSearchOptions> HSOpts,
71 SourceManager &SourceMgr, DiagnosticsEngine &Diags,
72 const LangOptions &LangOpts,
73 const TargetInfo *Target)
74 : HSOpts(std::move(HSOpts)), Diags(Diags),
75 FileMgr(SourceMgr.getFileManager()), FrameworkMap(64),
76 ModMap(SourceMgr, Diags, LangOpts, Target, *this) {}
78 HeaderSearch::~HeaderSearch() {
80 for (unsigned i = 0, e = HeaderMaps.size(); i != e; ++i)
81 delete HeaderMaps[i].second;
84 void HeaderSearch::PrintStats() {
85 fprintf(stderr, "\n*** HeaderSearch Stats:\n");
86 fprintf(stderr, "%d files tracked.\n", (int)FileInfo.size());
87 unsigned NumOnceOnlyFiles = 0, MaxNumIncludes = 0, NumSingleIncludedFiles = 0;
88 for (unsigned i = 0, e = FileInfo.size(); i != e; ++i) {
89 NumOnceOnlyFiles += FileInfo[i].isImport;
90 if (MaxNumIncludes < FileInfo[i].NumIncludes)
91 MaxNumIncludes = FileInfo[i].NumIncludes;
92 NumSingleIncludedFiles += FileInfo[i].NumIncludes == 1;
94 fprintf(stderr, " %d #import/#pragma once files.\n", NumOnceOnlyFiles);
95 fprintf(stderr, " %d included exactly once.\n", NumSingleIncludedFiles);
96 fprintf(stderr, " %d max times a file is included.\n", MaxNumIncludes);
98 fprintf(stderr, " %d #include/#include_next/#import.\n", NumIncluded);
99 fprintf(stderr, " %d #includes skipped due to"
100 " the multi-include optimization.\n", NumMultiIncludeFileOptzn);
102 fprintf(stderr, "%d framework lookups.\n", NumFrameworkLookups);
103 fprintf(stderr, "%d subframework lookups.\n", NumSubFrameworkLookups);
106 /// CreateHeaderMap - This method returns a HeaderMap for the specified
107 /// FileEntry, uniquing them through the 'HeaderMaps' datastructure.
108 const HeaderMap *HeaderSearch::CreateHeaderMap(const FileEntry *FE) {
109 // We expect the number of headermaps to be small, and almost always empty.
110 // If it ever grows, use of a linear search should be re-evaluated.
111 if (!HeaderMaps.empty()) {
112 for (unsigned i = 0, e = HeaderMaps.size(); i != e; ++i)
113 // Pointer equality comparison of FileEntries works because they are
114 // already uniqued by inode.
115 if (HeaderMaps[i].first == FE)
116 return HeaderMaps[i].second;
119 if (const HeaderMap *HM = HeaderMap::Create(FE, FileMgr)) {
120 HeaderMaps.push_back(std::make_pair(FE, HM));
127 /// \brief Get filenames for all registered header maps.
128 void HeaderSearch::getHeaderMapFileNames(
129 SmallVectorImpl<std::string> &Names) const {
130 for (auto &HM : HeaderMaps)
131 Names.push_back(HM.first->getName());
134 std::string HeaderSearch::getCachedModuleFileName(Module *Module) {
135 const FileEntry *ModuleMap =
136 getModuleMap().getModuleMapFileForUniquing(Module);
137 return getCachedModuleFileName(Module->Name, ModuleMap->getName());
140 std::string HeaderSearch::getPrebuiltModuleFileName(StringRef ModuleName,
142 // First check the module name to pcm file map.
143 auto i (HSOpts->PrebuiltModuleFiles.find(ModuleName));
144 if (i != HSOpts->PrebuiltModuleFiles.end())
147 if (FileMapOnly || HSOpts->PrebuiltModulePaths.empty())
150 // Then go through each prebuilt module directory and try to find the pcm
152 for (const std::string &Dir : HSOpts->PrebuiltModulePaths) {
153 SmallString<256> Result(Dir);
154 llvm::sys::fs::make_absolute(Result);
155 llvm::sys::path::append(Result, ModuleName + ".pcm");
156 if (getFileMgr().getFile(Result.str()))
157 return Result.str().str();
162 std::string HeaderSearch::getCachedModuleFileName(StringRef ModuleName,
163 StringRef ModuleMapPath) {
164 // If we don't have a module cache path or aren't supposed to use one, we
165 // can't do anything.
166 if (getModuleCachePath().empty())
169 SmallString<256> Result(getModuleCachePath());
170 llvm::sys::fs::make_absolute(Result);
172 if (HSOpts->DisableModuleHash) {
173 llvm::sys::path::append(Result, ModuleName + ".pcm");
175 // Construct the name <ModuleName>-<hash of ModuleMapPath>.pcm which should
176 // ideally be globally unique to this particular module. Name collisions
177 // in the hash are safe (because any translation unit can only import one
178 // module with each name), but result in a loss of caching.
180 // To avoid false-negatives, we form as canonical a path as we can, and map
181 // to lower-case in case we're on a case-insensitive file system.
182 std::string Parent = llvm::sys::path::parent_path(ModuleMapPath);
185 auto *Dir = FileMgr.getDirectory(Parent);
188 auto DirName = FileMgr.getCanonicalName(Dir);
189 auto FileName = llvm::sys::path::filename(ModuleMapPath);
191 llvm::hash_code Hash =
192 llvm::hash_combine(DirName.lower(), FileName.lower());
194 SmallString<128> HashStr;
195 llvm::APInt(64, size_t(Hash)).toStringUnsigned(HashStr, /*Radix*/36);
196 llvm::sys::path::append(Result, ModuleName + "-" + HashStr + ".pcm");
198 return Result.str().str();
201 Module *HeaderSearch::lookupModule(StringRef ModuleName, bool AllowSearch) {
202 // Look in the module map to determine if there is a module by this name.
203 Module *Module = ModMap.findModule(ModuleName);
204 if (Module || !AllowSearch || !HSOpts->ImplicitModuleMaps)
207 StringRef SearchName = ModuleName;
208 Module = lookupModule(ModuleName, SearchName);
210 // The facility for "private modules" -- adjacent, optional module maps named
211 // module.private.modulemap that are supposed to define private submodules --
212 // is sometimes misused by frameworks that name their associated private
213 // module FooPrivate, rather than as a submodule named Foo.Private as
214 // intended. Here we compensate for such cases by looking in directories named
215 // Foo.framework, when we previously looked and failed to find a
216 // FooPrivate.framework.
217 if (!Module && SearchName.consume_back("Private"))
218 Module = lookupModule(ModuleName, SearchName);
222 Module *HeaderSearch::lookupModule(StringRef ModuleName, StringRef SearchName) {
223 Module *Module = nullptr;
225 // Look through the various header search paths to load any available module
226 // maps, searching for a module map that describes this module.
227 for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
228 if (SearchDirs[Idx].isFramework()) {
229 // Search for or infer a module map for a framework. Here we use
230 // SearchName rather than ModuleName, to permit finding private modules
231 // named FooPrivate in buggy frameworks named Foo.
232 SmallString<128> FrameworkDirName;
233 FrameworkDirName += SearchDirs[Idx].getFrameworkDir()->getName();
234 llvm::sys::path::append(FrameworkDirName, SearchName + ".framework");
235 if (const DirectoryEntry *FrameworkDir
236 = FileMgr.getDirectory(FrameworkDirName)) {
238 = SearchDirs[Idx].getDirCharacteristic() != SrcMgr::C_User;
239 Module = loadFrameworkModule(ModuleName, FrameworkDir, IsSystem);
245 // FIXME: Figure out how header maps and module maps will work together.
247 // Only deal with normal search directories.
248 if (!SearchDirs[Idx].isNormalDir())
251 bool IsSystem = SearchDirs[Idx].isSystemHeaderDirectory();
252 // Search for a module map file in this directory.
253 if (loadModuleMapFile(SearchDirs[Idx].getDir(), IsSystem,
254 /*IsFramework*/false) == LMM_NewlyLoaded) {
255 // We just loaded a module map file; check whether the module is
257 Module = ModMap.findModule(ModuleName);
262 // Search for a module map in a subdirectory with the same name as the
264 SmallString<128> NestedModuleMapDirName;
265 NestedModuleMapDirName = SearchDirs[Idx].getDir()->getName();
266 llvm::sys::path::append(NestedModuleMapDirName, ModuleName);
267 if (loadModuleMapFile(NestedModuleMapDirName, IsSystem,
268 /*IsFramework*/false) == LMM_NewlyLoaded){
269 // If we just loaded a module map file, look for the module again.
270 Module = ModMap.findModule(ModuleName);
275 // If we've already performed the exhaustive search for module maps in this
276 // search directory, don't do it again.
277 if (SearchDirs[Idx].haveSearchedAllModuleMaps())
280 // Load all module maps in the immediate subdirectories of this search
282 loadSubdirectoryModuleMaps(SearchDirs[Idx]);
284 // Look again for the module.
285 Module = ModMap.findModule(ModuleName);
293 //===----------------------------------------------------------------------===//
294 // File lookup within a DirectoryLookup scope
295 //===----------------------------------------------------------------------===//
297 /// getName - Return the directory or filename corresponding to this lookup
299 StringRef DirectoryLookup::getName() const {
301 return getDir()->getName();
303 return getFrameworkDir()->getName();
304 assert(isHeaderMap() && "Unknown DirectoryLookup");
305 return getHeaderMap()->getFileName();
308 const FileEntry *HeaderSearch::getFileAndSuggestModule(
309 StringRef FileName, SourceLocation IncludeLoc, const DirectoryEntry *Dir,
310 bool IsSystemHeaderDir, Module *RequestingModule,
311 ModuleMap::KnownHeader *SuggestedModule) {
312 // If we have a module map that might map this header, load it and
313 // check whether we'll have a suggestion for a module.
314 const FileEntry *File = getFileMgr().getFile(FileName, /*OpenFile=*/true);
318 // If there is a module that corresponds to this header, suggest it.
319 if (!findUsableModuleForHeader(File, Dir ? Dir : File->getDir(),
320 RequestingModule, SuggestedModule,
327 /// LookupFile - Lookup the specified file in this search path, returning it
328 /// if it exists or returning null if not.
329 const FileEntry *DirectoryLookup::LookupFile(
332 SourceLocation IncludeLoc,
333 SmallVectorImpl<char> *SearchPath,
334 SmallVectorImpl<char> *RelativePath,
335 Module *RequestingModule,
336 ModuleMap::KnownHeader *SuggestedModule,
337 bool &InUserSpecifiedSystemFramework,
339 SmallVectorImpl<char> &MappedName) const {
340 InUserSpecifiedSystemFramework = false;
341 HasBeenMapped = false;
343 SmallString<1024> TmpDir;
345 // Concatenate the requested file onto the directory.
346 TmpDir = getDir()->getName();
347 llvm::sys::path::append(TmpDir, Filename);
349 StringRef SearchPathRef(getDir()->getName());
351 SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
354 RelativePath->clear();
355 RelativePath->append(Filename.begin(), Filename.end());
358 return HS.getFileAndSuggestModule(TmpDir, IncludeLoc, getDir(),
359 isSystemHeaderDirectory(),
360 RequestingModule, SuggestedModule);
364 return DoFrameworkLookup(Filename, HS, SearchPath, RelativePath,
365 RequestingModule, SuggestedModule,
366 InUserSpecifiedSystemFramework);
368 assert(isHeaderMap() && "Unknown directory lookup");
369 const HeaderMap *HM = getHeaderMap();
370 SmallString<1024> Path;
371 StringRef Dest = HM->lookupFilename(Filename, Path);
375 const FileEntry *Result;
377 // Check if the headermap maps the filename to a framework include
378 // ("Foo.h" -> "Foo/Foo.h"), in which case continue header lookup using the
379 // framework include.
380 if (llvm::sys::path::is_relative(Dest)) {
382 MappedName.append(Dest.begin(), Dest.end());
383 Filename = StringRef(MappedName.begin(), MappedName.size());
384 HasBeenMapped = true;
385 Result = HM->LookupFile(Filename, HS.getFileMgr());
387 Result = HS.getFileMgr().getFile(Dest);
392 StringRef SearchPathRef(getName());
394 SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
397 RelativePath->clear();
398 RelativePath->append(Filename.begin(), Filename.end());
404 /// \brief Given a framework directory, find the top-most framework directory.
406 /// \param FileMgr The file manager to use for directory lookups.
407 /// \param DirName The name of the framework directory.
408 /// \param SubmodulePath Will be populated with the submodule path from the
409 /// returned top-level module to the originally named framework.
410 static const DirectoryEntry *
411 getTopFrameworkDir(FileManager &FileMgr, StringRef DirName,
412 SmallVectorImpl<std::string> &SubmodulePath) {
413 assert(llvm::sys::path::extension(DirName) == ".framework" &&
414 "Not a framework directory");
416 // Note: as an egregious but useful hack we use the real path here, because
417 // frameworks moving between top-level frameworks to embedded frameworks tend
418 // to be symlinked, and we base the logical structure of modules on the
419 // physical layout. In particular, we need to deal with crazy includes like
421 // #include <Foo/Frameworks/Bar.framework/Headers/Wibble.h>
423 // where 'Bar' used to be embedded in 'Foo', is now a top-level framework
424 // which one should access with, e.g.,
426 // #include <Bar/Wibble.h>
428 // Similar issues occur when a top-level framework has moved into an
429 // embedded framework.
430 const DirectoryEntry *TopFrameworkDir = FileMgr.getDirectory(DirName);
431 DirName = FileMgr.getCanonicalName(TopFrameworkDir);
433 // Get the parent directory name.
434 DirName = llvm::sys::path::parent_path(DirName);
438 // Determine whether this directory exists.
439 const DirectoryEntry *Dir = FileMgr.getDirectory(DirName);
443 // If this is a framework directory, then we're a subframework of this
445 if (llvm::sys::path::extension(DirName) == ".framework") {
446 SubmodulePath.push_back(llvm::sys::path::stem(DirName));
447 TopFrameworkDir = Dir;
451 return TopFrameworkDir;
454 static bool needModuleLookup(Module *RequestingModule,
455 bool HasSuggestedModule) {
456 return HasSuggestedModule ||
457 (RequestingModule && RequestingModule->NoUndeclaredIncludes);
460 /// DoFrameworkLookup - Do a lookup of the specified file in the current
461 /// DirectoryLookup, which is a framework directory.
462 const FileEntry *DirectoryLookup::DoFrameworkLookup(
463 StringRef Filename, HeaderSearch &HS, SmallVectorImpl<char> *SearchPath,
464 SmallVectorImpl<char> *RelativePath, Module *RequestingModule,
465 ModuleMap::KnownHeader *SuggestedModule,
466 bool &InUserSpecifiedSystemFramework) const {
467 FileManager &FileMgr = HS.getFileMgr();
469 // Framework names must have a '/' in the filename.
470 size_t SlashPos = Filename.find('/');
471 if (SlashPos == StringRef::npos) return nullptr;
473 // Find out if this is the home for the specified framework, by checking
474 // HeaderSearch. Possible answers are yes/no and unknown.
475 HeaderSearch::FrameworkCacheEntry &CacheEntry =
476 HS.LookupFrameworkCache(Filename.substr(0, SlashPos));
478 // If it is known and in some other directory, fail.
479 if (CacheEntry.Directory && CacheEntry.Directory != getFrameworkDir())
482 // Otherwise, construct the path to this framework dir.
484 // FrameworkName = "/System/Library/Frameworks/"
485 SmallString<1024> FrameworkName;
486 FrameworkName += getFrameworkDir()->getName();
487 if (FrameworkName.empty() || FrameworkName.back() != '/')
488 FrameworkName.push_back('/');
490 // FrameworkName = "/System/Library/Frameworks/Cocoa"
491 StringRef ModuleName(Filename.begin(), SlashPos);
492 FrameworkName += ModuleName;
494 // FrameworkName = "/System/Library/Frameworks/Cocoa.framework/"
495 FrameworkName += ".framework/";
497 // If the cache entry was unresolved, populate it now.
498 if (!CacheEntry.Directory) {
499 HS.IncrementFrameworkLookupCount();
501 // If the framework dir doesn't exist, we fail.
502 const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkName);
503 if (!Dir) return nullptr;
505 // Otherwise, if it does, remember that this is the right direntry for this
507 CacheEntry.Directory = getFrameworkDir();
509 // If this is a user search directory, check if the framework has been
510 // user-specified as a system framework.
511 if (getDirCharacteristic() == SrcMgr::C_User) {
512 SmallString<1024> SystemFrameworkMarker(FrameworkName);
513 SystemFrameworkMarker += ".system_framework";
514 if (llvm::sys::fs::exists(SystemFrameworkMarker)) {
515 CacheEntry.IsUserSpecifiedSystemFramework = true;
520 // Set the 'user-specified system framework' flag.
521 InUserSpecifiedSystemFramework = CacheEntry.IsUserSpecifiedSystemFramework;
524 RelativePath->clear();
525 RelativePath->append(Filename.begin()+SlashPos+1, Filename.end());
528 // Check "/System/Library/Frameworks/Cocoa.framework/Headers/file.h"
529 unsigned OrigSize = FrameworkName.size();
531 FrameworkName += "Headers/";
535 // Without trailing '/'.
536 SearchPath->append(FrameworkName.begin(), FrameworkName.end()-1);
539 FrameworkName.append(Filename.begin()+SlashPos+1, Filename.end());
540 const FileEntry *FE = FileMgr.getFile(FrameworkName,
541 /*openFile=*/!SuggestedModule);
543 // Check "/System/Library/Frameworks/Cocoa.framework/PrivateHeaders/file.h"
544 const char *Private = "Private";
545 FrameworkName.insert(FrameworkName.begin()+OrigSize, Private,
546 Private+strlen(Private));
548 SearchPath->insert(SearchPath->begin()+OrigSize, Private,
549 Private+strlen(Private));
551 FE = FileMgr.getFile(FrameworkName, /*openFile=*/!SuggestedModule);
554 // If we found the header and are allowed to suggest a module, do so now.
555 if (FE && needModuleLookup(RequestingModule, SuggestedModule)) {
556 // Find the framework in which this header occurs.
557 StringRef FrameworkPath = FE->getDir()->getName();
558 bool FoundFramework = false;
560 // Determine whether this directory exists.
561 const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkPath);
565 // If this is a framework directory, then we're a subframework of this
567 if (llvm::sys::path::extension(FrameworkPath) == ".framework") {
568 FoundFramework = true;
572 // Get the parent directory name.
573 FrameworkPath = llvm::sys::path::parent_path(FrameworkPath);
574 if (FrameworkPath.empty())
578 bool IsSystem = getDirCharacteristic() != SrcMgr::C_User;
579 if (FoundFramework) {
580 if (!HS.findUsableModuleForFrameworkHeader(
581 FE, FrameworkPath, RequestingModule, SuggestedModule, IsSystem))
584 if (!HS.findUsableModuleForHeader(FE, getDir(), RequestingModule,
585 SuggestedModule, IsSystem))
592 void HeaderSearch::setTarget(const TargetInfo &Target) {
593 ModMap.setTarget(Target);
596 //===----------------------------------------------------------------------===//
597 // Header File Location.
598 //===----------------------------------------------------------------------===//
600 /// \brief Return true with a diagnostic if the file that MSVC would have found
601 /// fails to match the one that Clang would have found with MSVC header search
603 static bool checkMSVCHeaderSearch(DiagnosticsEngine &Diags,
604 const FileEntry *MSFE, const FileEntry *FE,
605 SourceLocation IncludeLoc) {
606 if (MSFE && FE != MSFE) {
607 Diags.Report(IncludeLoc, diag::ext_pp_include_search_ms) << MSFE->getName();
613 static const char *copyString(StringRef Str, llvm::BumpPtrAllocator &Alloc) {
614 assert(!Str.empty());
615 char *CopyStr = Alloc.Allocate<char>(Str.size()+1);
616 std::copy(Str.begin(), Str.end(), CopyStr);
617 CopyStr[Str.size()] = '\0';
621 /// LookupFile - Given a "foo" or \<foo> reference, look up the indicated file,
622 /// return null on failure. isAngled indicates whether the file reference is
623 /// for system \#include's or not (i.e. using <> instead of ""). Includers, if
624 /// non-empty, indicates where the \#including file(s) are, in case a relative
625 /// search is needed. Microsoft mode will pass all \#including files.
626 const FileEntry *HeaderSearch::LookupFile(
627 StringRef Filename, SourceLocation IncludeLoc, bool isAngled,
628 const DirectoryLookup *FromDir, const DirectoryLookup *&CurDir,
629 ArrayRef<std::pair<const FileEntry *, const DirectoryEntry *>> Includers,
630 SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
631 Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule,
632 bool *IsMapped, bool SkipCache, bool BuildSystemModule) {
637 *SuggestedModule = ModuleMap::KnownHeader();
639 // If 'Filename' is absolute, check to see if it exists and no searching.
640 if (llvm::sys::path::is_absolute(Filename)) {
643 // If this was an #include_next "/absolute/file", fail.
644 if (FromDir) return nullptr;
649 RelativePath->clear();
650 RelativePath->append(Filename.begin(), Filename.end());
652 // Otherwise, just return the file.
653 return getFileAndSuggestModule(Filename, IncludeLoc, nullptr,
654 /*IsSystemHeaderDir*/false,
655 RequestingModule, SuggestedModule);
658 // This is the header that MSVC's header search would have found.
659 const FileEntry *MSFE = nullptr;
660 ModuleMap::KnownHeader MSSuggestedModule;
662 // Unless disabled, check to see if the file is in the #includer's
663 // directory. This cannot be based on CurDir, because each includer could be
664 // a #include of a subdirectory (#include "foo/bar.h") and a subsequent
665 // include of "baz.h" should resolve to "whatever/foo/baz.h".
666 // This search is not done for <> headers.
667 if (!Includers.empty() && !isAngled && !NoCurDirSearch) {
668 SmallString<1024> TmpDir;
670 for (const auto &IncluderAndDir : Includers) {
671 const FileEntry *Includer = IncluderAndDir.first;
673 // Concatenate the requested file onto the directory.
674 // FIXME: Portability. Filename concatenation should be in sys::Path.
675 TmpDir = IncluderAndDir.second->getName();
676 TmpDir.push_back('/');
677 TmpDir.append(Filename.begin(), Filename.end());
679 // FIXME: We don't cache the result of getFileInfo across the call to
680 // getFileAndSuggestModule, because it's a reference to an element of
681 // a container that could be reallocated across this call.
683 // If we have no includer, that means we're processing a #include
684 // from a module build. We should treat this as a system header if we're
685 // building a [system] module.
686 bool IncluderIsSystemHeader =
687 Includer ? getFileInfo(Includer).DirInfo != SrcMgr::C_User :
689 if (const FileEntry *FE = getFileAndSuggestModule(
690 TmpDir, IncludeLoc, IncluderAndDir.second, IncluderIsSystemHeader,
691 RequestingModule, SuggestedModule)) {
693 assert(First && "only first includer can have no file");
697 // Leave CurDir unset.
698 // This file is a system header or C++ unfriendly if the old file is.
700 // Note that we only use one of FromHFI/ToHFI at once, due to potential
701 // reallocation of the underlying vector potentially making the first
702 // reference binding dangling.
703 HeaderFileInfo &FromHFI = getFileInfo(Includer);
704 unsigned DirInfo = FromHFI.DirInfo;
705 bool IndexHeaderMapHeader = FromHFI.IndexHeaderMapHeader;
706 StringRef Framework = FromHFI.Framework;
708 HeaderFileInfo &ToHFI = getFileInfo(FE);
709 ToHFI.DirInfo = DirInfo;
710 ToHFI.IndexHeaderMapHeader = IndexHeaderMapHeader;
711 ToHFI.Framework = Framework;
714 StringRef SearchPathRef(IncluderAndDir.second->getName());
716 SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
719 RelativePath->clear();
720 RelativePath->append(Filename.begin(), Filename.end());
725 // Otherwise, we found the path via MSVC header search rules. If
726 // -Wmsvc-include is enabled, we have to keep searching to see if we
727 // would've found this header in -I or -isystem directories.
728 if (Diags.isIgnored(diag::ext_pp_include_search_ms, IncludeLoc)) {
732 if (SuggestedModule) {
733 MSSuggestedModule = *SuggestedModule;
734 *SuggestedModule = ModuleMap::KnownHeader();
745 // If this is a system #include, ignore the user #include locs.
746 unsigned i = isAngled ? AngledDirIdx : 0;
748 // If this is a #include_next request, start searching after the directory the
749 // file was found in.
751 i = FromDir-&SearchDirs[0];
753 // Cache all of the lookups performed by this method. Many headers are
754 // multiply included, and the "pragma once" optimization prevents them from
755 // being relex/pp'd, but they would still have to search through a
756 // (potentially huge) series of SearchDirs to find it.
757 LookupFileCacheInfo &CacheLookup = LookupFileCache[Filename];
759 // If the entry has been previously looked up, the first value will be
760 // non-zero. If the value is equal to i (the start point of our search), then
761 // this is a matching hit.
762 if (!SkipCache && CacheLookup.StartIdx == i+1) {
763 // Skip querying potentially lots of directories for this lookup.
764 i = CacheLookup.HitIdx;
765 if (CacheLookup.MappedName) {
766 Filename = CacheLookup.MappedName;
771 // Otherwise, this is the first query, or the previous query didn't match
772 // our search start. We will fill in our found location below, so prime the
773 // start point value.
774 CacheLookup.reset(/*StartIdx=*/i+1);
777 SmallString<64> MappedName;
779 // Check each directory in sequence to see if it contains this file.
780 for (; i != SearchDirs.size(); ++i) {
781 bool InUserSpecifiedSystemFramework = false;
782 bool HasBeenMapped = false;
783 const FileEntry *FE = SearchDirs[i].LookupFile(
784 Filename, *this, IncludeLoc, SearchPath, RelativePath, RequestingModule,
785 SuggestedModule, InUserSpecifiedSystemFramework, HasBeenMapped,
788 CacheLookup.MappedName =
789 copyString(Filename, LookupFileCache.getAllocator());
795 CurDir = &SearchDirs[i];
797 // This file is a system header or C++ unfriendly if the dir is.
798 HeaderFileInfo &HFI = getFileInfo(FE);
799 HFI.DirInfo = CurDir->getDirCharacteristic();
801 // If the directory characteristic is User but this framework was
802 // user-specified to be treated as a system framework, promote the
804 if (HFI.DirInfo == SrcMgr::C_User && InUserSpecifiedSystemFramework)
805 HFI.DirInfo = SrcMgr::C_System;
807 // If the filename matches a known system header prefix, override
808 // whether the file is a system header.
809 for (unsigned j = SystemHeaderPrefixes.size(); j; --j) {
810 if (Filename.startswith(SystemHeaderPrefixes[j-1].first)) {
811 HFI.DirInfo = SystemHeaderPrefixes[j-1].second ? SrcMgr::C_System
817 // If this file is found in a header map and uses the framework style of
818 // includes, then this header is part of a framework we're building.
819 if (CurDir->isIndexHeaderMap()) {
820 size_t SlashPos = Filename.find('/');
821 if (SlashPos != StringRef::npos) {
822 HFI.IndexHeaderMapHeader = 1;
823 HFI.Framework = getUniqueFrameworkName(StringRef(Filename.begin(),
828 if (checkMSVCHeaderSearch(Diags, MSFE, FE, IncludeLoc)) {
830 *SuggestedModule = MSSuggestedModule;
834 // Remember this location for the next lookup we do.
835 CacheLookup.HitIdx = i;
839 // If we are including a file with a quoted include "foo.h" from inside
840 // a header in a framework that is currently being built, and we couldn't
841 // resolve "foo.h" any other way, change the include to <Foo/foo.h>, where
842 // "Foo" is the name of the framework in which the including header was found.
843 if (!Includers.empty() && Includers.front().first && !isAngled &&
844 Filename.find('/') == StringRef::npos) {
845 HeaderFileInfo &IncludingHFI = getFileInfo(Includers.front().first);
846 if (IncludingHFI.IndexHeaderMapHeader) {
847 SmallString<128> ScratchFilename;
848 ScratchFilename += IncludingHFI.Framework;
849 ScratchFilename += '/';
850 ScratchFilename += Filename;
852 const FileEntry *FE =
853 LookupFile(ScratchFilename, IncludeLoc, /*isAngled=*/true, FromDir,
854 CurDir, Includers.front(), SearchPath, RelativePath,
855 RequestingModule, SuggestedModule, IsMapped);
857 if (checkMSVCHeaderSearch(Diags, MSFE, FE, IncludeLoc)) {
859 *SuggestedModule = MSSuggestedModule;
863 LookupFileCacheInfo &CacheLookup = LookupFileCache[Filename];
864 CacheLookup.HitIdx = LookupFileCache[ScratchFilename].HitIdx;
865 // FIXME: SuggestedModule.
870 if (checkMSVCHeaderSearch(Diags, MSFE, nullptr, IncludeLoc)) {
872 *SuggestedModule = MSSuggestedModule;
876 // Otherwise, didn't find it. Remember we didn't find this.
877 CacheLookup.HitIdx = SearchDirs.size();
881 /// LookupSubframeworkHeader - Look up a subframework for the specified
882 /// \#include file. For example, if \#include'ing <HIToolbox/HIToolbox.h> from
883 /// within ".../Carbon.framework/Headers/Carbon.h", check to see if HIToolbox
884 /// is a subframework within Carbon.framework. If so, return the FileEntry
885 /// for the designated file, otherwise return null.
886 const FileEntry *HeaderSearch::
887 LookupSubframeworkHeader(StringRef Filename,
888 const FileEntry *ContextFileEnt,
889 SmallVectorImpl<char> *SearchPath,
890 SmallVectorImpl<char> *RelativePath,
891 Module *RequestingModule,
892 ModuleMap::KnownHeader *SuggestedModule) {
893 assert(ContextFileEnt && "No context file?");
895 // Framework names must have a '/' in the filename. Find it.
896 // FIXME: Should we permit '\' on Windows?
897 size_t SlashPos = Filename.find('/');
898 if (SlashPos == StringRef::npos) return nullptr;
900 // Look up the base framework name of the ContextFileEnt.
901 StringRef ContextName = ContextFileEnt->getName();
903 // If the context info wasn't a framework, couldn't be a subframework.
904 const unsigned DotFrameworkLen = 10;
905 auto FrameworkPos = ContextName.find(".framework");
906 if (FrameworkPos == StringRef::npos ||
907 (ContextName[FrameworkPos + DotFrameworkLen] != '/' &&
908 ContextName[FrameworkPos + DotFrameworkLen] != '\\'))
911 SmallString<1024> FrameworkName(ContextName.data(), ContextName.data() +
913 DotFrameworkLen + 1);
915 // Append Frameworks/HIToolbox.framework/
916 FrameworkName += "Frameworks/";
917 FrameworkName.append(Filename.begin(), Filename.begin()+SlashPos);
918 FrameworkName += ".framework/";
921 *FrameworkMap.insert(std::make_pair(Filename.substr(0, SlashPos),
922 FrameworkCacheEntry())).first;
924 // Some other location?
925 if (CacheLookup.second.Directory &&
926 CacheLookup.first().size() == FrameworkName.size() &&
927 memcmp(CacheLookup.first().data(), &FrameworkName[0],
928 CacheLookup.first().size()) != 0)
931 // Cache subframework.
932 if (!CacheLookup.second.Directory) {
933 ++NumSubFrameworkLookups;
935 // If the framework dir doesn't exist, we fail.
936 const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkName);
937 if (!Dir) return nullptr;
939 // Otherwise, if it does, remember that this is the right direntry for this
941 CacheLookup.second.Directory = Dir;
944 const FileEntry *FE = nullptr;
947 RelativePath->clear();
948 RelativePath->append(Filename.begin()+SlashPos+1, Filename.end());
951 // Check ".../Frameworks/HIToolbox.framework/Headers/HIToolbox.h"
952 SmallString<1024> HeadersFilename(FrameworkName);
953 HeadersFilename += "Headers/";
956 // Without trailing '/'.
957 SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
960 HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
961 if (!(FE = FileMgr.getFile(HeadersFilename, /*openFile=*/true))) {
962 // Check ".../Frameworks/HIToolbox.framework/PrivateHeaders/HIToolbox.h"
963 HeadersFilename = FrameworkName;
964 HeadersFilename += "PrivateHeaders/";
967 // Without trailing '/'.
968 SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
971 HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
972 if (!(FE = FileMgr.getFile(HeadersFilename, /*openFile=*/true)))
976 // This file is a system header or C++ unfriendly if the old file is.
978 // Note that the temporary 'DirInfo' is required here, as either call to
979 // getFileInfo could resize the vector and we don't want to rely on order
981 unsigned DirInfo = getFileInfo(ContextFileEnt).DirInfo;
982 getFileInfo(FE).DirInfo = DirInfo;
984 FrameworkName.pop_back(); // remove the trailing '/'
985 if (!findUsableModuleForFrameworkHeader(FE, FrameworkName, RequestingModule,
986 SuggestedModule, /*IsSystem*/ false))
992 //===----------------------------------------------------------------------===//
993 // File Info Management.
994 //===----------------------------------------------------------------------===//
996 /// \brief Merge the header file info provided by \p OtherHFI into the current
997 /// header file info (\p HFI)
998 static void mergeHeaderFileInfo(HeaderFileInfo &HFI,
999 const HeaderFileInfo &OtherHFI) {
1000 assert(OtherHFI.External && "expected to merge external HFI");
1002 HFI.isImport |= OtherHFI.isImport;
1003 HFI.isPragmaOnce |= OtherHFI.isPragmaOnce;
1004 HFI.isModuleHeader |= OtherHFI.isModuleHeader;
1005 HFI.NumIncludes += OtherHFI.NumIncludes;
1007 if (!HFI.ControllingMacro && !HFI.ControllingMacroID) {
1008 HFI.ControllingMacro = OtherHFI.ControllingMacro;
1009 HFI.ControllingMacroID = OtherHFI.ControllingMacroID;
1012 HFI.DirInfo = OtherHFI.DirInfo;
1013 HFI.External = (!HFI.IsValid || HFI.External);
1015 HFI.IndexHeaderMapHeader = OtherHFI.IndexHeaderMapHeader;
1017 if (HFI.Framework.empty())
1018 HFI.Framework = OtherHFI.Framework;
1021 /// getFileInfo - Return the HeaderFileInfo structure for the specified
1023 HeaderFileInfo &HeaderSearch::getFileInfo(const FileEntry *FE) {
1024 if (FE->getUID() >= FileInfo.size())
1025 FileInfo.resize(FE->getUID() + 1);
1027 HeaderFileInfo *HFI = &FileInfo[FE->getUID()];
1028 // FIXME: Use a generation count to check whether this is really up to date.
1029 if (ExternalSource && !HFI->Resolved) {
1030 HFI->Resolved = true;
1031 auto ExternalHFI = ExternalSource->GetHeaderFileInfo(FE);
1033 HFI = &FileInfo[FE->getUID()];
1034 if (ExternalHFI.External)
1035 mergeHeaderFileInfo(*HFI, ExternalHFI);
1038 HFI->IsValid = true;
1039 // We have local information about this header file, so it's no longer
1040 // strictly external.
1041 HFI->External = false;
1045 const HeaderFileInfo *
1046 HeaderSearch::getExistingFileInfo(const FileEntry *FE,
1047 bool WantExternal) const {
1048 // If we have an external source, ensure we have the latest information.
1049 // FIXME: Use a generation count to check whether this is really up to date.
1050 HeaderFileInfo *HFI;
1051 if (ExternalSource) {
1052 if (FE->getUID() >= FileInfo.size()) {
1055 FileInfo.resize(FE->getUID() + 1);
1058 HFI = &FileInfo[FE->getUID()];
1059 if (!WantExternal && (!HFI->IsValid || HFI->External))
1061 if (!HFI->Resolved) {
1062 HFI->Resolved = true;
1063 auto ExternalHFI = ExternalSource->GetHeaderFileInfo(FE);
1065 HFI = &FileInfo[FE->getUID()];
1066 if (ExternalHFI.External)
1067 mergeHeaderFileInfo(*HFI, ExternalHFI);
1069 } else if (FE->getUID() >= FileInfo.size()) {
1072 HFI = &FileInfo[FE->getUID()];
1075 if (!HFI->IsValid || (HFI->External && !WantExternal))
1081 bool HeaderSearch::isFileMultipleIncludeGuarded(const FileEntry *File) {
1082 // Check if we've ever seen this file as a header.
1083 if (auto *HFI = getExistingFileInfo(File))
1084 return HFI->isPragmaOnce || HFI->isImport || HFI->ControllingMacro ||
1085 HFI->ControllingMacroID;
1089 void HeaderSearch::MarkFileModuleHeader(const FileEntry *FE,
1090 ModuleMap::ModuleHeaderRole Role,
1091 bool isCompilingModuleHeader) {
1092 bool isModularHeader = !(Role & ModuleMap::TextualHeader);
1094 // Don't mark the file info as non-external if there's nothing to change.
1095 if (!isCompilingModuleHeader) {
1096 if (!isModularHeader)
1098 auto *HFI = getExistingFileInfo(FE);
1099 if (HFI && HFI->isModuleHeader)
1103 auto &HFI = getFileInfo(FE);
1104 HFI.isModuleHeader |= isModularHeader;
1105 HFI.isCompilingModuleHeader |= isCompilingModuleHeader;
1108 bool HeaderSearch::ShouldEnterIncludeFile(Preprocessor &PP,
1109 const FileEntry *File, bool isImport,
1110 bool ModulesEnabled, Module *M) {
1111 ++NumIncluded; // Count # of attempted #includes.
1113 // Get information about this file.
1114 HeaderFileInfo &FileInfo = getFileInfo(File);
1116 // FIXME: this is a workaround for the lack of proper modules-aware support
1117 // for #import / #pragma once
1118 auto TryEnterImported = [&]() -> bool {
1119 if (!ModulesEnabled)
1121 // Ensure FileInfo bits are up to date.
1122 ModMap.resolveHeaderDirectives(File);
1123 // Modules with builtins are special; multiple modules use builtins as
1124 // modular headers, example:
1126 // module stddef { header "stddef.h" export * }
1128 // After module map parsing, this expands to:
1131 // header "/path_to_builtin_dirs/stddef.h"
1132 // textual "stddef.h"
1135 // It's common that libc++ and system modules will both define such
1136 // submodules. Make sure cached results for a builtin header won't
1137 // prevent other builtin modules to potentially enter the builtin header.
1138 // Note that builtins are header guarded and the decision to actually
1139 // enter them is postponed to the controlling macros logic below.
1140 bool TryEnterHdr = false;
1141 if (FileInfo.isCompilingModuleHeader && FileInfo.isModuleHeader)
1142 TryEnterHdr = File->getDir() == ModMap.getBuiltinDir() &&
1143 ModuleMap::isBuiltinHeader(
1144 llvm::sys::path::filename(File->getName()));
1146 // Textual headers can be #imported from different modules. Since ObjC
1147 // headers find in the wild might rely only on #import and do not contain
1148 // controlling macros, be conservative and only try to enter textual headers
1149 // if such macro is present.
1150 if (!FileInfo.isModuleHeader &&
1151 FileInfo.getControllingMacro(ExternalLookup))
1156 // If this is a #import directive, check that we have not already imported
1159 // If this has already been imported, don't import it again.
1160 FileInfo.isImport = true;
1162 // Has this already been #import'ed or #include'd?
1163 if (FileInfo.NumIncludes && !TryEnterImported())
1166 // Otherwise, if this is a #include of a file that was previously #import'd
1167 // or if this is the second #include of a #pragma once file, ignore it.
1168 if (FileInfo.isImport && !TryEnterImported())
1172 // Next, check to see if the file is wrapped with #ifndef guards. If so, and
1173 // if the macro that guards it is defined, we know the #include has no effect.
1174 if (const IdentifierInfo *ControllingMacro
1175 = FileInfo.getControllingMacro(ExternalLookup)) {
1176 // If the header corresponds to a module, check whether the macro is already
1177 // defined in that module rather than checking in the current set of visible
1179 if (M ? PP.isMacroDefinedInLocalModule(ControllingMacro, M)
1180 : PP.isMacroDefined(ControllingMacro)) {
1181 ++NumMultiIncludeFileOptzn;
1186 // Increment the number of times this file has been included.
1187 ++FileInfo.NumIncludes;
1192 size_t HeaderSearch::getTotalMemory() const {
1193 return SearchDirs.capacity()
1194 + llvm::capacity_in_bytes(FileInfo)
1195 + llvm::capacity_in_bytes(HeaderMaps)
1196 + LookupFileCache.getAllocator().getTotalMemory()
1197 + FrameworkMap.getAllocator().getTotalMemory();
1200 StringRef HeaderSearch::getUniqueFrameworkName(StringRef Framework) {
1201 return FrameworkNames.insert(Framework).first->first();
1204 bool HeaderSearch::hasModuleMap(StringRef FileName,
1205 const DirectoryEntry *Root,
1207 if (!HSOpts->ImplicitModuleMaps)
1210 SmallVector<const DirectoryEntry *, 2> FixUpDirectories;
1212 StringRef DirName = FileName;
1214 // Get the parent directory name.
1215 DirName = llvm::sys::path::parent_path(DirName);
1216 if (DirName.empty())
1219 // Determine whether this directory exists.
1220 const DirectoryEntry *Dir = FileMgr.getDirectory(DirName);
1224 // Try to load the module map file in this directory.
1225 switch (loadModuleMapFile(Dir, IsSystem,
1226 llvm::sys::path::extension(Dir->getName()) ==
1228 case LMM_NewlyLoaded:
1229 case LMM_AlreadyLoaded:
1230 // Success. All of the directories we stepped through inherit this module
1232 for (unsigned I = 0, N = FixUpDirectories.size(); I != N; ++I)
1233 DirectoryHasModuleMap[FixUpDirectories[I]] = true;
1236 case LMM_NoDirectory:
1237 case LMM_InvalidModuleMap:
1241 // If we hit the top of our search, we're done.
1245 // Keep track of all of the directories we checked, so we can mark them as
1246 // having module maps if we eventually do find a module map.
1247 FixUpDirectories.push_back(Dir);
1251 ModuleMap::KnownHeader
1252 HeaderSearch::findModuleForHeader(const FileEntry *File,
1253 bool AllowTextual) const {
1254 if (ExternalSource) {
1255 // Make sure the external source has handled header info about this file,
1256 // which includes whether the file is part of a module.
1257 (void)getExistingFileInfo(File);
1259 return ModMap.findModuleForHeader(File, AllowTextual);
1262 static bool suggestModule(HeaderSearch &HS, const FileEntry *File,
1263 Module *RequestingModule,
1264 ModuleMap::KnownHeader *SuggestedModule) {
1265 ModuleMap::KnownHeader Module =
1266 HS.findModuleForHeader(File, /*AllowTextual*/true);
1267 if (SuggestedModule)
1268 *SuggestedModule = (Module.getRole() & ModuleMap::TextualHeader)
1269 ? ModuleMap::KnownHeader()
1272 // If this module specifies [no_undeclared_includes], we cannot find any
1273 // file that's in a non-dependency module.
1274 if (RequestingModule && Module && RequestingModule->NoUndeclaredIncludes) {
1275 HS.getModuleMap().resolveUses(RequestingModule, /*Complain*/false);
1276 if (!RequestingModule->directlyUses(Module.getModule())) {
1284 bool HeaderSearch::findUsableModuleForHeader(
1285 const FileEntry *File, const DirectoryEntry *Root, Module *RequestingModule,
1286 ModuleMap::KnownHeader *SuggestedModule, bool IsSystemHeaderDir) {
1287 if (File && needModuleLookup(RequestingModule, SuggestedModule)) {
1288 // If there is a module that corresponds to this header, suggest it.
1289 hasModuleMap(File->getName(), Root, IsSystemHeaderDir);
1290 return suggestModule(*this, File, RequestingModule, SuggestedModule);
1295 bool HeaderSearch::findUsableModuleForFrameworkHeader(
1296 const FileEntry *File, StringRef FrameworkName, Module *RequestingModule,
1297 ModuleMap::KnownHeader *SuggestedModule, bool IsSystemFramework) {
1298 // If we're supposed to suggest a module, look for one now.
1299 if (needModuleLookup(RequestingModule, SuggestedModule)) {
1300 // Find the top-level framework based on this framework.
1301 SmallVector<std::string, 4> SubmodulePath;
1302 const DirectoryEntry *TopFrameworkDir
1303 = ::getTopFrameworkDir(FileMgr, FrameworkName, SubmodulePath);
1305 // Determine the name of the top-level framework.
1306 StringRef ModuleName = llvm::sys::path::stem(TopFrameworkDir->getName());
1308 // Load this framework module. If that succeeds, find the suggested module
1309 // for this header, if any.
1310 loadFrameworkModule(ModuleName, TopFrameworkDir, IsSystemFramework);
1312 // FIXME: This can find a module not part of ModuleName, which is
1313 // important so that we're consistent about whether this header
1314 // corresponds to a module. Possibly we should lock down framework modules
1315 // so that this is not possible.
1316 return suggestModule(*this, File, RequestingModule, SuggestedModule);
1321 static const FileEntry *getPrivateModuleMap(const FileEntry *File,
1322 FileManager &FileMgr) {
1323 StringRef Filename = llvm::sys::path::filename(File->getName());
1324 SmallString<128> PrivateFilename(File->getDir()->getName());
1325 if (Filename == "module.map")
1326 llvm::sys::path::append(PrivateFilename, "module_private.map");
1327 else if (Filename == "module.modulemap")
1328 llvm::sys::path::append(PrivateFilename, "module.private.modulemap");
1331 return FileMgr.getFile(PrivateFilename);
1334 bool HeaderSearch::loadModuleMapFile(const FileEntry *File, bool IsSystem,
1335 FileID ID, unsigned *Offset,
1336 StringRef OriginalModuleMapFile) {
1337 // Find the directory for the module. For frameworks, that may require going
1338 // up from the 'Modules' directory.
1339 const DirectoryEntry *Dir = nullptr;
1340 if (getHeaderSearchOpts().ModuleMapFileHomeIsCwd)
1341 Dir = FileMgr.getDirectory(".");
1343 if (!OriginalModuleMapFile.empty()) {
1344 // We're building a preprocessed module map. Find or invent the directory
1345 // that it originally occupied.
1346 Dir = FileMgr.getDirectory(
1347 llvm::sys::path::parent_path(OriginalModuleMapFile));
1349 auto *FakeFile = FileMgr.getVirtualFile(OriginalModuleMapFile, 0, 0);
1350 Dir = FakeFile->getDir();
1353 Dir = File->getDir();
1356 StringRef DirName(Dir->getName());
1357 if (llvm::sys::path::filename(DirName) == "Modules") {
1358 DirName = llvm::sys::path::parent_path(DirName);
1359 if (DirName.endswith(".framework"))
1360 Dir = FileMgr.getDirectory(DirName);
1361 // FIXME: This assert can fail if there's a race between the above check
1362 // and the removal of the directory.
1363 assert(Dir && "parent must exist");
1367 switch (loadModuleMapFileImpl(File, IsSystem, Dir, ID, Offset)) {
1368 case LMM_AlreadyLoaded:
1369 case LMM_NewlyLoaded:
1371 case LMM_NoDirectory:
1372 case LMM_InvalidModuleMap:
1375 llvm_unreachable("Unknown load module map result");
1378 HeaderSearch::LoadModuleMapResult
1379 HeaderSearch::loadModuleMapFileImpl(const FileEntry *File, bool IsSystem,
1380 const DirectoryEntry *Dir, FileID ID,
1382 assert(File && "expected FileEntry");
1384 // Check whether we've already loaded this module map, and mark it as being
1385 // loaded in case we recursively try to load it from itself.
1386 auto AddResult = LoadedModuleMaps.insert(std::make_pair(File, true));
1387 if (!AddResult.second)
1388 return AddResult.first->second ? LMM_AlreadyLoaded : LMM_InvalidModuleMap;
1390 if (ModMap.parseModuleMapFile(File, IsSystem, Dir, ID, Offset)) {
1391 LoadedModuleMaps[File] = false;
1392 return LMM_InvalidModuleMap;
1395 // Try to load a corresponding private module map.
1396 if (const FileEntry *PMMFile = getPrivateModuleMap(File, FileMgr)) {
1397 if (ModMap.parseModuleMapFile(PMMFile, IsSystem, Dir)) {
1398 LoadedModuleMaps[File] = false;
1399 return LMM_InvalidModuleMap;
1403 // This directory has a module map.
1404 return LMM_NewlyLoaded;
1408 HeaderSearch::lookupModuleMapFile(const DirectoryEntry *Dir, bool IsFramework) {
1409 if (!HSOpts->ImplicitModuleMaps)
1411 // For frameworks, the preferred spelling is Modules/module.modulemap, but
1412 // module.map at the framework root is also accepted.
1413 SmallString<128> ModuleMapFileName(Dir->getName());
1415 llvm::sys::path::append(ModuleMapFileName, "Modules");
1416 llvm::sys::path::append(ModuleMapFileName, "module.modulemap");
1417 if (const FileEntry *F = FileMgr.getFile(ModuleMapFileName))
1420 // Continue to allow module.map
1421 ModuleMapFileName = Dir->getName();
1422 llvm::sys::path::append(ModuleMapFileName, "module.map");
1423 return FileMgr.getFile(ModuleMapFileName);
1426 Module *HeaderSearch::loadFrameworkModule(StringRef Name,
1427 const DirectoryEntry *Dir,
1429 if (Module *Module = ModMap.findModule(Name))
1432 // Try to load a module map file.
1433 switch (loadModuleMapFile(Dir, IsSystem, /*IsFramework*/true)) {
1434 case LMM_InvalidModuleMap:
1435 // Try to infer a module map from the framework directory.
1436 if (HSOpts->ImplicitModuleMaps)
1437 ModMap.inferFrameworkModule(Dir, IsSystem, /*Parent=*/nullptr);
1440 case LMM_AlreadyLoaded:
1441 case LMM_NoDirectory:
1444 case LMM_NewlyLoaded:
1448 return ModMap.findModule(Name);
1451 HeaderSearch::LoadModuleMapResult
1452 HeaderSearch::loadModuleMapFile(StringRef DirName, bool IsSystem,
1454 if (const DirectoryEntry *Dir = FileMgr.getDirectory(DirName))
1455 return loadModuleMapFile(Dir, IsSystem, IsFramework);
1457 return LMM_NoDirectory;
1460 HeaderSearch::LoadModuleMapResult
1461 HeaderSearch::loadModuleMapFile(const DirectoryEntry *Dir, bool IsSystem,
1463 auto KnownDir = DirectoryHasModuleMap.find(Dir);
1464 if (KnownDir != DirectoryHasModuleMap.end())
1465 return KnownDir->second ? LMM_AlreadyLoaded : LMM_InvalidModuleMap;
1467 if (const FileEntry *ModuleMapFile = lookupModuleMapFile(Dir, IsFramework)) {
1468 LoadModuleMapResult Result =
1469 loadModuleMapFileImpl(ModuleMapFile, IsSystem, Dir);
1470 // Add Dir explicitly in case ModuleMapFile is in a subdirectory.
1471 // E.g. Foo.framework/Modules/module.modulemap
1472 // ^Dir ^ModuleMapFile
1473 if (Result == LMM_NewlyLoaded)
1474 DirectoryHasModuleMap[Dir] = true;
1475 else if (Result == LMM_InvalidModuleMap)
1476 DirectoryHasModuleMap[Dir] = false;
1479 return LMM_InvalidModuleMap;
1482 void HeaderSearch::collectAllModules(SmallVectorImpl<Module *> &Modules) {
1485 if (HSOpts->ImplicitModuleMaps) {
1486 // Load module maps for each of the header search directories.
1487 for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
1488 bool IsSystem = SearchDirs[Idx].isSystemHeaderDirectory();
1489 if (SearchDirs[Idx].isFramework()) {
1491 SmallString<128> DirNative;
1492 llvm::sys::path::native(SearchDirs[Idx].getFrameworkDir()->getName(),
1495 // Search each of the ".framework" directories to load them as modules.
1496 vfs::FileSystem &FS = *FileMgr.getVirtualFileSystem();
1497 for (vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
1498 Dir != DirEnd && !EC; Dir.increment(EC)) {
1499 if (llvm::sys::path::extension(Dir->getName()) != ".framework")
1502 const DirectoryEntry *FrameworkDir =
1503 FileMgr.getDirectory(Dir->getName());
1507 // Load this framework module.
1508 loadFrameworkModule(llvm::sys::path::stem(Dir->getName()),
1509 FrameworkDir, IsSystem);
1514 // FIXME: Deal with header maps.
1515 if (SearchDirs[Idx].isHeaderMap())
1518 // Try to load a module map file for the search directory.
1519 loadModuleMapFile(SearchDirs[Idx].getDir(), IsSystem,
1520 /*IsFramework*/ false);
1522 // Try to load module map files for immediate subdirectories of this
1523 // search directory.
1524 loadSubdirectoryModuleMaps(SearchDirs[Idx]);
1528 // Populate the list of modules.
1529 for (ModuleMap::module_iterator M = ModMap.module_begin(),
1530 MEnd = ModMap.module_end();
1532 Modules.push_back(M->getValue());
1536 void HeaderSearch::loadTopLevelSystemModules() {
1537 if (!HSOpts->ImplicitModuleMaps)
1540 // Load module maps for each of the header search directories.
1541 for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
1542 // We only care about normal header directories.
1543 if (!SearchDirs[Idx].isNormalDir()) {
1547 // Try to load a module map file for the search directory.
1548 loadModuleMapFile(SearchDirs[Idx].getDir(),
1549 SearchDirs[Idx].isSystemHeaderDirectory(),
1550 SearchDirs[Idx].isFramework());
1554 void HeaderSearch::loadSubdirectoryModuleMaps(DirectoryLookup &SearchDir) {
1555 assert(HSOpts->ImplicitModuleMaps &&
1556 "Should not be loading subdirectory module maps");
1558 if (SearchDir.haveSearchedAllModuleMaps())
1562 SmallString<128> DirNative;
1563 llvm::sys::path::native(SearchDir.getDir()->getName(), DirNative);
1564 vfs::FileSystem &FS = *FileMgr.getVirtualFileSystem();
1565 for (vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
1566 Dir != DirEnd && !EC; Dir.increment(EC)) {
1568 llvm::sys::path::extension(Dir->getName()) == ".framework";
1569 if (IsFramework == SearchDir.isFramework())
1570 loadModuleMapFile(Dir->getName(), SearchDir.isSystemHeaderDirectory(),
1571 SearchDir.isFramework());
1574 SearchDir.setSearchedAllModuleMaps(true);
1577 std::string HeaderSearch::suggestPathToFileForDiagnostics(const FileEntry *File,
1579 // FIXME: We assume that the path name currently cached in the FileEntry is
1580 // the most appropriate one for this analysis (and that it's spelled the same
1581 // way as the corresponding header search path).
1582 StringRef Name = File->getName();
1584 unsigned BestPrefixLength = 0;
1585 unsigned BestSearchDir;
1587 for (unsigned I = 0; I != SearchDirs.size(); ++I) {
1588 // FIXME: Support this search within frameworks and header maps.
1589 if (!SearchDirs[I].isNormalDir())
1592 StringRef Dir = SearchDirs[I].getDir()->getName();
1593 for (auto NI = llvm::sys::path::begin(Name),
1594 NE = llvm::sys::path::end(Name),
1595 DI = llvm::sys::path::begin(Dir),
1596 DE = llvm::sys::path::end(Dir);
1597 /*termination condition in loop*/; ++NI, ++DI) {
1598 // '.' components in Name are ignored.
1599 while (NI != NE && *NI == ".")
1604 // '.' components in Dir are ignored.
1605 while (DI != DE && *DI == ".")
1608 // Dir is a prefix of Name, up to '.' components and choice of path
1610 unsigned PrefixLength = NI - llvm::sys::path::begin(Name);
1611 if (PrefixLength > BestPrefixLength) {
1612 BestPrefixLength = PrefixLength;
1624 *IsSystem = BestPrefixLength ? BestSearchDir >= SystemDirIdx : false;
1625 return Name.drop_front(BestPrefixLength);