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/Lex/HeaderMap.h"
16 #include "clang/Lex/Lexer.h"
17 #include "clang/Basic/Diagnostic.h"
18 #include "clang/Basic/FileManager.h"
19 #include "clang/Basic/IdentifierTable.h"
20 #include "llvm/Support/FileSystem.h"
21 #include "llvm/Support/Path.h"
22 #include "llvm/ADT/SmallString.h"
23 #include "llvm/Support/Capacity.h"
25 using namespace clang;
27 const IdentifierInfo *
28 HeaderFileInfo::getControllingMacro(ExternalIdentifierLookup *External) {
30 return ControllingMacro;
32 if (!ControllingMacroID || !External)
35 ControllingMacro = External->GetIdentifier(ControllingMacroID);
36 return ControllingMacro;
39 ExternalHeaderFileInfoSource::~ExternalHeaderFileInfoSource() {}
41 HeaderSearch::HeaderSearch(FileManager &FM, DiagnosticsEngine &Diags,
42 const LangOptions &LangOpts,
43 const TargetInfo *Target)
44 : FileMgr(FM), Diags(Diags), FrameworkMap(64),
45 ModMap(FileMgr, *Diags.getClient(), LangOpts, Target)
49 NoCurDirSearch = false;
54 NumMultiIncludeFileOptzn = 0;
55 NumFrameworkLookups = NumSubFrameworkLookups = 0;
58 HeaderSearch::~HeaderSearch() {
60 for (unsigned i = 0, e = HeaderMaps.size(); i != e; ++i)
61 delete HeaderMaps[i].second;
64 void HeaderSearch::PrintStats() {
65 fprintf(stderr, "\n*** HeaderSearch Stats:\n");
66 fprintf(stderr, "%d files tracked.\n", (int)FileInfo.size());
67 unsigned NumOnceOnlyFiles = 0, MaxNumIncludes = 0, NumSingleIncludedFiles = 0;
68 for (unsigned i = 0, e = FileInfo.size(); i != e; ++i) {
69 NumOnceOnlyFiles += FileInfo[i].isImport;
70 if (MaxNumIncludes < FileInfo[i].NumIncludes)
71 MaxNumIncludes = FileInfo[i].NumIncludes;
72 NumSingleIncludedFiles += FileInfo[i].NumIncludes == 1;
74 fprintf(stderr, " %d #import/#pragma once files.\n", NumOnceOnlyFiles);
75 fprintf(stderr, " %d included exactly once.\n", NumSingleIncludedFiles);
76 fprintf(stderr, " %d max times a file is included.\n", MaxNumIncludes);
78 fprintf(stderr, " %d #include/#include_next/#import.\n", NumIncluded);
79 fprintf(stderr, " %d #includes skipped due to"
80 " the multi-include optimization.\n", NumMultiIncludeFileOptzn);
82 fprintf(stderr, "%d framework lookups.\n", NumFrameworkLookups);
83 fprintf(stderr, "%d subframework lookups.\n", NumSubFrameworkLookups);
86 /// CreateHeaderMap - This method returns a HeaderMap for the specified
87 /// FileEntry, uniquing them through the 'HeaderMaps' datastructure.
88 const HeaderMap *HeaderSearch::CreateHeaderMap(const FileEntry *FE) {
89 // We expect the number of headermaps to be small, and almost always empty.
90 // If it ever grows, use of a linear search should be re-evaluated.
91 if (!HeaderMaps.empty()) {
92 for (unsigned i = 0, e = HeaderMaps.size(); i != e; ++i)
93 // Pointer equality comparison of FileEntries works because they are
94 // already uniqued by inode.
95 if (HeaderMaps[i].first == FE)
96 return HeaderMaps[i].second;
99 if (const HeaderMap *HM = HeaderMap::Create(FE, FileMgr)) {
100 HeaderMaps.push_back(std::make_pair(FE, HM));
107 std::string HeaderSearch::getModuleFileName(Module *Module) {
108 // If we don't have a module cache path, we can't do anything.
109 if (ModuleCachePath.empty())
110 return std::string();
113 SmallString<256> Result(ModuleCachePath);
114 llvm::sys::path::append(Result, Module->getTopLevelModule()->Name + ".pcm");
115 return Result.str().str();
118 std::string HeaderSearch::getModuleFileName(StringRef ModuleName) {
119 // If we don't have a module cache path, we can't do anything.
120 if (ModuleCachePath.empty())
121 return std::string();
124 SmallString<256> Result(ModuleCachePath);
125 llvm::sys::path::append(Result, ModuleName + ".pcm");
126 return Result.str().str();
129 Module *HeaderSearch::lookupModule(StringRef ModuleName, bool AllowSearch) {
130 // Look in the module map to determine if there is a module by this name.
131 Module *Module = ModMap.findModule(ModuleName);
132 if (Module || !AllowSearch)
135 // Look through the various header search paths to load any avai;able module
136 // maps, searching for a module map that describes this module.
137 for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
138 if (SearchDirs[Idx].isFramework()) {
139 // Search for or infer a module map for a framework.
140 SmallString<128> FrameworkDirName;
141 FrameworkDirName += SearchDirs[Idx].getFrameworkDir()->getName();
142 llvm::sys::path::append(FrameworkDirName, ModuleName + ".framework");
143 if (const DirectoryEntry *FrameworkDir
144 = FileMgr.getDirectory(FrameworkDirName)) {
146 = SearchDirs[Idx].getDirCharacteristic() != SrcMgr::C_User;
147 Module = loadFrameworkModule(ModuleName, FrameworkDir, IsSystem);
153 // FIXME: Figure out how header maps and module maps will work together.
155 // Only deal with normal search directories.
156 if (!SearchDirs[Idx].isNormalDir())
159 // Search for a module map file in this directory.
160 if (loadModuleMapFile(SearchDirs[Idx].getDir()) == LMM_NewlyLoaded) {
161 // We just loaded a module map file; check whether the module is
163 Module = ModMap.findModule(ModuleName);
168 // Search for a module map in a subdirectory with the same name as the
170 SmallString<128> NestedModuleMapDirName;
171 NestedModuleMapDirName = SearchDirs[Idx].getDir()->getName();
172 llvm::sys::path::append(NestedModuleMapDirName, ModuleName);
173 if (loadModuleMapFile(NestedModuleMapDirName) == LMM_NewlyLoaded) {
174 // If we just loaded a module map file, look for the module again.
175 Module = ModMap.findModule(ModuleName);
184 //===----------------------------------------------------------------------===//
185 // File lookup within a DirectoryLookup scope
186 //===----------------------------------------------------------------------===//
188 /// getName - Return the directory or filename corresponding to this lookup
190 const char *DirectoryLookup::getName() const {
192 return getDir()->getName();
194 return getFrameworkDir()->getName();
195 assert(isHeaderMap() && "Unknown DirectoryLookup");
196 return getHeaderMap()->getFileName();
200 /// LookupFile - Lookup the specified file in this search path, returning it
201 /// if it exists or returning null if not.
202 const FileEntry *DirectoryLookup::LookupFile(
205 SmallVectorImpl<char> *SearchPath,
206 SmallVectorImpl<char> *RelativePath,
207 Module **SuggestedModule,
208 bool &InUserSpecifiedSystemFramework) const {
209 InUserSpecifiedSystemFramework = false;
211 SmallString<1024> TmpDir;
213 // Concatenate the requested file onto the directory.
214 TmpDir = getDir()->getName();
215 llvm::sys::path::append(TmpDir, Filename);
216 if (SearchPath != NULL) {
217 StringRef SearchPathRef(getDir()->getName());
219 SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
221 if (RelativePath != NULL) {
222 RelativePath->clear();
223 RelativePath->append(Filename.begin(), Filename.end());
226 // If we have a module map that might map this header, load it and
227 // check whether we'll have a suggestion for a module.
228 if (SuggestedModule && HS.hasModuleMap(TmpDir, getDir())) {
229 const FileEntry *File = HS.getFileMgr().getFile(TmpDir.str(),
234 // If there is a module that corresponds to this header,
236 *SuggestedModule = HS.findModuleForHeader(File);
240 return HS.getFileMgr().getFile(TmpDir.str(), /*openFile=*/true);
244 return DoFrameworkLookup(Filename, HS, SearchPath, RelativePath,
245 SuggestedModule, InUserSpecifiedSystemFramework);
247 assert(isHeaderMap() && "Unknown directory lookup");
248 const FileEntry * const Result = getHeaderMap()->LookupFile(
249 Filename, HS.getFileMgr());
251 if (SearchPath != NULL) {
252 StringRef SearchPathRef(getName());
254 SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
256 if (RelativePath != NULL) {
257 RelativePath->clear();
258 RelativePath->append(Filename.begin(), Filename.end());
265 /// DoFrameworkLookup - Do a lookup of the specified file in the current
266 /// DirectoryLookup, which is a framework directory.
267 const FileEntry *DirectoryLookup::DoFrameworkLookup(
270 SmallVectorImpl<char> *SearchPath,
271 SmallVectorImpl<char> *RelativePath,
272 Module **SuggestedModule,
273 bool &InUserSpecifiedSystemFramework) const
275 FileManager &FileMgr = HS.getFileMgr();
277 // Framework names must have a '/' in the filename.
278 size_t SlashPos = Filename.find('/');
279 if (SlashPos == StringRef::npos) return 0;
281 // Find out if this is the home for the specified framework, by checking
282 // HeaderSearch. Possible answers are yes/no and unknown.
283 HeaderSearch::FrameworkCacheEntry &CacheEntry =
284 HS.LookupFrameworkCache(Filename.substr(0, SlashPos));
286 // If it is known and in some other directory, fail.
287 if (CacheEntry.Directory && CacheEntry.Directory != getFrameworkDir())
290 // Otherwise, construct the path to this framework dir.
292 // FrameworkName = "/System/Library/Frameworks/"
293 SmallString<1024> FrameworkName;
294 FrameworkName += getFrameworkDir()->getName();
295 if (FrameworkName.empty() || FrameworkName.back() != '/')
296 FrameworkName.push_back('/');
298 // FrameworkName = "/System/Library/Frameworks/Cocoa"
299 StringRef ModuleName(Filename.begin(), SlashPos);
300 FrameworkName += ModuleName;
302 // FrameworkName = "/System/Library/Frameworks/Cocoa.framework/"
303 FrameworkName += ".framework/";
305 // If the cache entry was unresolved, populate it now.
306 if (CacheEntry.Directory == 0) {
307 HS.IncrementFrameworkLookupCount();
309 // If the framework dir doesn't exist, we fail.
310 const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkName.str());
311 if (Dir == 0) return 0;
313 // Otherwise, if it does, remember that this is the right direntry for this
315 CacheEntry.Directory = getFrameworkDir();
317 // If this is a user search directory, check if the framework has been
318 // user-specified as a system framework.
319 if (getDirCharacteristic() == SrcMgr::C_User) {
320 SmallString<1024> SystemFrameworkMarker(FrameworkName);
321 SystemFrameworkMarker += ".system_framework";
322 if (llvm::sys::fs::exists(SystemFrameworkMarker.str())) {
323 CacheEntry.IsUserSpecifiedSystemFramework = true;
328 // Set the 'user-specified system framework' flag.
329 InUserSpecifiedSystemFramework = CacheEntry.IsUserSpecifiedSystemFramework;
331 if (RelativePath != NULL) {
332 RelativePath->clear();
333 RelativePath->append(Filename.begin()+SlashPos+1, Filename.end());
336 // If we're allowed to look for modules, try to load or create the module
337 // corresponding to this framework.
339 if (SuggestedModule) {
340 if (const DirectoryEntry *FrameworkDir
341 = FileMgr.getDirectory(FrameworkName)) {
342 bool IsSystem = getDirCharacteristic() != SrcMgr::C_User;
343 Module = HS.loadFrameworkModule(ModuleName, FrameworkDir, IsSystem);
347 // Check "/System/Library/Frameworks/Cocoa.framework/Headers/file.h"
348 unsigned OrigSize = FrameworkName.size();
350 FrameworkName += "Headers/";
352 if (SearchPath != NULL) {
354 // Without trailing '/'.
355 SearchPath->append(FrameworkName.begin(), FrameworkName.end()-1);
358 // Determine whether this is the module we're building or not.
359 bool AutomaticImport = Module;
360 FrameworkName.append(Filename.begin()+SlashPos+1, Filename.end());
361 if (const FileEntry *FE = FileMgr.getFile(FrameworkName.str(),
362 /*openFile=*/!AutomaticImport)) {
364 *SuggestedModule = HS.findModuleForHeader(FE);
368 // Check "/System/Library/Frameworks/Cocoa.framework/PrivateHeaders/file.h"
369 const char *Private = "Private";
370 FrameworkName.insert(FrameworkName.begin()+OrigSize, Private,
371 Private+strlen(Private));
372 if (SearchPath != NULL)
373 SearchPath->insert(SearchPath->begin()+OrigSize, Private,
374 Private+strlen(Private));
376 const FileEntry *FE = FileMgr.getFile(FrameworkName.str(),
377 /*openFile=*/!AutomaticImport);
378 if (FE && AutomaticImport)
379 *SuggestedModule = HS.findModuleForHeader(FE);
383 void HeaderSearch::setTarget(const TargetInfo &Target) {
384 ModMap.setTarget(Target);
388 //===----------------------------------------------------------------------===//
389 // Header File Location.
390 //===----------------------------------------------------------------------===//
393 /// LookupFile - Given a "foo" or \<foo> reference, look up the indicated file,
394 /// return null on failure. isAngled indicates whether the file reference is
395 /// for system \#include's or not (i.e. using <> instead of ""). CurFileEnt, if
396 /// non-null, indicates where the \#including file is, in case a relative search
398 const FileEntry *HeaderSearch::LookupFile(
401 const DirectoryLookup *FromDir,
402 const DirectoryLookup *&CurDir,
403 const FileEntry *CurFileEnt,
404 SmallVectorImpl<char> *SearchPath,
405 SmallVectorImpl<char> *RelativePath,
406 Module **SuggestedModule,
410 *SuggestedModule = 0;
412 // If 'Filename' is absolute, check to see if it exists and no searching.
413 if (llvm::sys::path::is_absolute(Filename)) {
416 // If this was an #include_next "/absolute/file", fail.
417 if (FromDir) return 0;
419 if (SearchPath != NULL)
421 if (RelativePath != NULL) {
422 RelativePath->clear();
423 RelativePath->append(Filename.begin(), Filename.end());
425 // Otherwise, just return the file.
426 return FileMgr.getFile(Filename, /*openFile=*/true);
429 // Unless disabled, check to see if the file is in the #includer's
430 // directory. This has to be based on CurFileEnt, not CurDir, because
431 // CurFileEnt could be a #include of a subdirectory (#include "foo/bar.h") and
432 // a subsequent include of "baz.h" should resolve to "whatever/foo/baz.h".
433 // This search is not done for <> headers.
434 if (CurFileEnt && !isAngled && !NoCurDirSearch) {
435 SmallString<1024> TmpDir;
436 // Concatenate the requested file onto the directory.
437 // FIXME: Portability. Filename concatenation should be in sys::Path.
438 TmpDir += CurFileEnt->getDir()->getName();
439 TmpDir.push_back('/');
440 TmpDir.append(Filename.begin(), Filename.end());
441 if (const FileEntry *FE = FileMgr.getFile(TmpDir.str(),/*openFile=*/true)) {
442 // Leave CurDir unset.
443 // This file is a system header or C++ unfriendly if the old file is.
445 // Note that we only use one of FromHFI/ToHFI at once, due to potential
446 // reallocation of the underlying vector potentially making the first
447 // reference binding dangling.
448 HeaderFileInfo &FromHFI = getFileInfo(CurFileEnt);
449 unsigned DirInfo = FromHFI.DirInfo;
450 bool IndexHeaderMapHeader = FromHFI.IndexHeaderMapHeader;
451 StringRef Framework = FromHFI.Framework;
453 HeaderFileInfo &ToHFI = getFileInfo(FE);
454 ToHFI.DirInfo = DirInfo;
455 ToHFI.IndexHeaderMapHeader = IndexHeaderMapHeader;
456 ToHFI.Framework = Framework;
458 if (SearchPath != NULL) {
459 StringRef SearchPathRef(CurFileEnt->getDir()->getName());
461 SearchPath->append(SearchPathRef.begin(), SearchPathRef.end());
463 if (RelativePath != NULL) {
464 RelativePath->clear();
465 RelativePath->append(Filename.begin(), Filename.end());
473 // If this is a system #include, ignore the user #include locs.
474 unsigned i = isAngled ? AngledDirIdx : 0;
476 // If this is a #include_next request, start searching after the directory the
477 // file was found in.
479 i = FromDir-&SearchDirs[0];
481 // Cache all of the lookups performed by this method. Many headers are
482 // multiply included, and the "pragma once" optimization prevents them from
483 // being relex/pp'd, but they would still have to search through a
484 // (potentially huge) series of SearchDirs to find it.
485 std::pair<unsigned, unsigned> &CacheLookup =
486 LookupFileCache.GetOrCreateValue(Filename).getValue();
488 // If the entry has been previously looked up, the first value will be
489 // non-zero. If the value is equal to i (the start point of our search), then
490 // this is a matching hit.
491 if (!SkipCache && CacheLookup.first == i+1) {
492 // Skip querying potentially lots of directories for this lookup.
493 i = CacheLookup.second;
495 // Otherwise, this is the first query, or the previous query didn't match
496 // our search start. We will fill in our found location below, so prime the
497 // start point value.
498 CacheLookup.first = i+1;
501 // Check each directory in sequence to see if it contains this file.
502 for (; i != SearchDirs.size(); ++i) {
503 bool InUserSpecifiedSystemFramework = false;
504 const FileEntry *FE =
505 SearchDirs[i].LookupFile(Filename, *this, SearchPath, RelativePath,
506 SuggestedModule, InUserSpecifiedSystemFramework);
509 CurDir = &SearchDirs[i];
511 // This file is a system header or C++ unfriendly if the dir is.
512 HeaderFileInfo &HFI = getFileInfo(FE);
513 HFI.DirInfo = CurDir->getDirCharacteristic();
515 // If the directory characteristic is User but this framework was
516 // user-specified to be treated as a system framework, promote the
518 if (HFI.DirInfo == SrcMgr::C_User && InUserSpecifiedSystemFramework)
519 HFI.DirInfo = SrcMgr::C_System;
521 // If the filename matches a known system header prefix, override
522 // whether the file is a system header.
523 for (unsigned j = SystemHeaderPrefixes.size(); j; --j) {
524 if (Filename.startswith(SystemHeaderPrefixes[j-1].first)) {
525 HFI.DirInfo = SystemHeaderPrefixes[j-1].second ? SrcMgr::C_System
531 // If this file is found in a header map and uses the framework style of
532 // includes, then this header is part of a framework we're building.
533 if (CurDir->isIndexHeaderMap()) {
534 size_t SlashPos = Filename.find('/');
535 if (SlashPos != StringRef::npos) {
536 HFI.IndexHeaderMapHeader = 1;
537 HFI.Framework = getUniqueFrameworkName(StringRef(Filename.begin(),
542 // Remember this location for the next lookup we do.
543 CacheLookup.second = i;
547 // If we are including a file with a quoted include "foo.h" from inside
548 // a header in a framework that is currently being built, and we couldn't
549 // resolve "foo.h" any other way, change the include to <Foo/foo.h>, where
550 // "Foo" is the name of the framework in which the including header was found.
551 if (CurFileEnt && !isAngled && Filename.find('/') == StringRef::npos) {
552 HeaderFileInfo &IncludingHFI = getFileInfo(CurFileEnt);
553 if (IncludingHFI.IndexHeaderMapHeader) {
554 SmallString<128> ScratchFilename;
555 ScratchFilename += IncludingHFI.Framework;
556 ScratchFilename += '/';
557 ScratchFilename += Filename;
559 const FileEntry *Result = LookupFile(ScratchFilename, /*isAngled=*/true,
560 FromDir, CurDir, CurFileEnt,
561 SearchPath, RelativePath,
563 std::pair<unsigned, unsigned> &CacheLookup
564 = LookupFileCache.GetOrCreateValue(Filename).getValue();
566 = LookupFileCache.GetOrCreateValue(ScratchFilename).getValue().second;
571 // Otherwise, didn't find it. Remember we didn't find this.
572 CacheLookup.second = SearchDirs.size();
576 /// LookupSubframeworkHeader - Look up a subframework for the specified
577 /// \#include file. For example, if \#include'ing <HIToolbox/HIToolbox.h> from
578 /// within ".../Carbon.framework/Headers/Carbon.h", check to see if HIToolbox
579 /// is a subframework within Carbon.framework. If so, return the FileEntry
580 /// for the designated file, otherwise return null.
581 const FileEntry *HeaderSearch::
582 LookupSubframeworkHeader(StringRef Filename,
583 const FileEntry *ContextFileEnt,
584 SmallVectorImpl<char> *SearchPath,
585 SmallVectorImpl<char> *RelativePath) {
586 assert(ContextFileEnt && "No context file?");
588 // Framework names must have a '/' in the filename. Find it.
589 // FIXME: Should we permit '\' on Windows?
590 size_t SlashPos = Filename.find('/');
591 if (SlashPos == StringRef::npos) return 0;
593 // Look up the base framework name of the ContextFileEnt.
594 const char *ContextName = ContextFileEnt->getName();
596 // If the context info wasn't a framework, couldn't be a subframework.
597 const unsigned DotFrameworkLen = 10;
598 const char *FrameworkPos = strstr(ContextName, ".framework");
599 if (FrameworkPos == 0 ||
600 (FrameworkPos[DotFrameworkLen] != '/' &&
601 FrameworkPos[DotFrameworkLen] != '\\'))
604 SmallString<1024> FrameworkName(ContextName, FrameworkPos+DotFrameworkLen+1);
606 // Append Frameworks/HIToolbox.framework/
607 FrameworkName += "Frameworks/";
608 FrameworkName.append(Filename.begin(), Filename.begin()+SlashPos);
609 FrameworkName += ".framework/";
611 llvm::StringMapEntry<FrameworkCacheEntry> &CacheLookup =
612 FrameworkMap.GetOrCreateValue(Filename.substr(0, SlashPos));
614 // Some other location?
615 if (CacheLookup.getValue().Directory &&
616 CacheLookup.getKeyLength() == FrameworkName.size() &&
617 memcmp(CacheLookup.getKeyData(), &FrameworkName[0],
618 CacheLookup.getKeyLength()) != 0)
621 // Cache subframework.
622 if (CacheLookup.getValue().Directory == 0) {
623 ++NumSubFrameworkLookups;
625 // If the framework dir doesn't exist, we fail.
626 const DirectoryEntry *Dir = FileMgr.getDirectory(FrameworkName.str());
627 if (Dir == 0) return 0;
629 // Otherwise, if it does, remember that this is the right direntry for this
631 CacheLookup.getValue().Directory = Dir;
634 const FileEntry *FE = 0;
636 if (RelativePath != NULL) {
637 RelativePath->clear();
638 RelativePath->append(Filename.begin()+SlashPos+1, Filename.end());
641 // Check ".../Frameworks/HIToolbox.framework/Headers/HIToolbox.h"
642 SmallString<1024> HeadersFilename(FrameworkName);
643 HeadersFilename += "Headers/";
644 if (SearchPath != NULL) {
646 // Without trailing '/'.
647 SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
650 HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
651 if (!(FE = FileMgr.getFile(HeadersFilename.str(), /*openFile=*/true))) {
653 // Check ".../Frameworks/HIToolbox.framework/PrivateHeaders/HIToolbox.h"
654 HeadersFilename = FrameworkName;
655 HeadersFilename += "PrivateHeaders/";
656 if (SearchPath != NULL) {
658 // Without trailing '/'.
659 SearchPath->append(HeadersFilename.begin(), HeadersFilename.end()-1);
662 HeadersFilename.append(Filename.begin()+SlashPos+1, Filename.end());
663 if (!(FE = FileMgr.getFile(HeadersFilename.str(), /*openFile=*/true)))
667 // This file is a system header or C++ unfriendly if the old file is.
669 // Note that the temporary 'DirInfo' is required here, as either call to
670 // getFileInfo could resize the vector and we don't want to rely on order
672 unsigned DirInfo = getFileInfo(ContextFileEnt).DirInfo;
673 getFileInfo(FE).DirInfo = DirInfo;
677 /// \brief Helper static function to normalize a path for injection into
678 /// a synthetic header.
679 /*static*/ std::string
680 HeaderSearch::NormalizeDashIncludePath(StringRef File, FileManager &FileMgr) {
681 // Implicit include paths should be resolved relative to the current
682 // working directory first, and then use the regular header search
683 // mechanism. The proper way to handle this is to have the
684 // predefines buffer located at the current working directory, but
685 // it has no file entry. For now, workaround this by using an
686 // absolute path if we find the file here, and otherwise letting
687 // header search handle it.
688 SmallString<128> Path(File);
689 llvm::sys::fs::make_absolute(Path);
691 if (llvm::sys::fs::exists(Path.str(), exists) || !exists)
694 FileMgr.getFile(File);
696 return Lexer::Stringify(Path.str());
699 //===----------------------------------------------------------------------===//
700 // File Info Management.
701 //===----------------------------------------------------------------------===//
703 /// \brief Merge the header file info provided by \p OtherHFI into the current
704 /// header file info (\p HFI)
705 static void mergeHeaderFileInfo(HeaderFileInfo &HFI,
706 const HeaderFileInfo &OtherHFI) {
707 HFI.isImport |= OtherHFI.isImport;
708 HFI.isPragmaOnce |= OtherHFI.isPragmaOnce;
709 HFI.NumIncludes += OtherHFI.NumIncludes;
711 if (!HFI.ControllingMacro && !HFI.ControllingMacroID) {
712 HFI.ControllingMacro = OtherHFI.ControllingMacro;
713 HFI.ControllingMacroID = OtherHFI.ControllingMacroID;
716 if (OtherHFI.External) {
717 HFI.DirInfo = OtherHFI.DirInfo;
718 HFI.External = OtherHFI.External;
719 HFI.IndexHeaderMapHeader = OtherHFI.IndexHeaderMapHeader;
722 if (HFI.Framework.empty())
723 HFI.Framework = OtherHFI.Framework;
728 /// getFileInfo - Return the HeaderFileInfo structure for the specified
730 HeaderFileInfo &HeaderSearch::getFileInfo(const FileEntry *FE) {
731 if (FE->getUID() >= FileInfo.size())
732 FileInfo.resize(FE->getUID()+1);
734 HeaderFileInfo &HFI = FileInfo[FE->getUID()];
735 if (ExternalSource && !HFI.Resolved)
736 mergeHeaderFileInfo(HFI, ExternalSource->GetHeaderFileInfo(FE));
740 bool HeaderSearch::isFileMultipleIncludeGuarded(const FileEntry *File) {
741 // Check if we've ever seen this file as a header.
742 if (File->getUID() >= FileInfo.size())
745 // Resolve header file info from the external source, if needed.
746 HeaderFileInfo &HFI = FileInfo[File->getUID()];
747 if (ExternalSource && !HFI.Resolved)
748 mergeHeaderFileInfo(HFI, ExternalSource->GetHeaderFileInfo(File));
750 return HFI.isPragmaOnce || HFI.ControllingMacro || HFI.ControllingMacroID;
753 void HeaderSearch::setHeaderFileInfoForUID(HeaderFileInfo HFI, unsigned UID) {
754 if (UID >= FileInfo.size())
755 FileInfo.resize(UID+1);
760 bool HeaderSearch::ShouldEnterIncludeFile(const FileEntry *File, bool isImport){
761 ++NumIncluded; // Count # of attempted #includes.
763 // Get information about this file.
764 HeaderFileInfo &FileInfo = getFileInfo(File);
766 // If this is a #import directive, check that we have not already imported
769 // If this has already been imported, don't import it again.
770 FileInfo.isImport = true;
772 // Has this already been #import'ed or #include'd?
773 if (FileInfo.NumIncludes) return false;
775 // Otherwise, if this is a #include of a file that was previously #import'd
776 // or if this is the second #include of a #pragma once file, ignore it.
777 if (FileInfo.isImport)
781 // Next, check to see if the file is wrapped with #ifndef guards. If so, and
782 // if the macro that guards it is defined, we know the #include has no effect.
783 if (const IdentifierInfo *ControllingMacro
784 = FileInfo.getControllingMacro(ExternalLookup))
785 if (ControllingMacro->hasMacroDefinition()) {
786 ++NumMultiIncludeFileOptzn;
790 // Increment the number of times this file has been included.
791 ++FileInfo.NumIncludes;
796 size_t HeaderSearch::getTotalMemory() const {
797 return SearchDirs.capacity()
798 + llvm::capacity_in_bytes(FileInfo)
799 + llvm::capacity_in_bytes(HeaderMaps)
800 + LookupFileCache.getAllocator().getTotalMemory()
801 + FrameworkMap.getAllocator().getTotalMemory();
804 StringRef HeaderSearch::getUniqueFrameworkName(StringRef Framework) {
805 return FrameworkNames.GetOrCreateValue(Framework).getKey();
808 bool HeaderSearch::hasModuleMap(StringRef FileName,
809 const DirectoryEntry *Root) {
810 llvm::SmallVector<const DirectoryEntry *, 2> FixUpDirectories;
812 StringRef DirName = FileName;
814 // Get the parent directory name.
815 DirName = llvm::sys::path::parent_path(DirName);
819 // Determine whether this directory exists.
820 const DirectoryEntry *Dir = FileMgr.getDirectory(DirName);
824 // Try to load the module map file in this directory.
825 switch (loadModuleMapFile(Dir)) {
826 case LMM_NewlyLoaded:
827 case LMM_AlreadyLoaded:
828 // Success. All of the directories we stepped through inherit this module
830 for (unsigned I = 0, N = FixUpDirectories.size(); I != N; ++I)
831 DirectoryHasModuleMap[FixUpDirectories[I]] = true;
835 case LMM_NoDirectory:
836 case LMM_InvalidModuleMap:
840 // If we hit the top of our search, we're done.
844 // Keep track of all of the directories we checked, so we can mark them as
845 // having module maps if we eventually do find a module map.
846 FixUpDirectories.push_back(Dir);
850 Module *HeaderSearch::findModuleForHeader(const FileEntry *File) {
851 if (Module *Mod = ModMap.findModuleForHeader(File))
857 bool HeaderSearch::loadModuleMapFile(const FileEntry *File) {
858 const DirectoryEntry *Dir = File->getDir();
860 llvm::DenseMap<const DirectoryEntry *, bool>::iterator KnownDir
861 = DirectoryHasModuleMap.find(Dir);
862 if (KnownDir != DirectoryHasModuleMap.end())
863 return !KnownDir->second;
865 bool Result = ModMap.parseModuleMapFile(File);
866 if (!Result && llvm::sys::path::filename(File->getName()) == "module.map") {
867 // If the file we loaded was a module.map, look for the corresponding
868 // module_private.map.
869 SmallString<128> PrivateFilename(Dir->getName());
870 llvm::sys::path::append(PrivateFilename, "module_private.map");
871 if (const FileEntry *PrivateFile = FileMgr.getFile(PrivateFilename))
872 Result = ModMap.parseModuleMapFile(PrivateFile);
875 DirectoryHasModuleMap[Dir] = !Result;
879 Module *HeaderSearch::loadFrameworkModule(StringRef Name,
880 const DirectoryEntry *Dir,
882 if (Module *Module = ModMap.findModule(Name))
885 // Try to load a module map file.
886 switch (loadModuleMapFile(Dir)) {
887 case LMM_InvalidModuleMap:
890 case LMM_AlreadyLoaded:
891 case LMM_NoDirectory:
894 case LMM_NewlyLoaded:
895 return ModMap.findModule(Name);
898 // The top-level framework directory, from which we'll infer a framework
900 const DirectoryEntry *TopFrameworkDir = Dir;
902 // The path from the module we're actually looking for back to the top-level
904 llvm::SmallVector<StringRef, 2> SubmodulePath;
905 SubmodulePath.push_back(Name);
907 // Walk the directory structure to find any enclosing frameworks.
908 StringRef DirName = Dir->getName();
910 // Get the parent directory name.
911 DirName = llvm::sys::path::parent_path(DirName);
915 // Determine whether this directory exists.
916 Dir = FileMgr.getDirectory(DirName);
920 // If this is a framework directory, then we're a subframework of this
922 if (llvm::sys::path::extension(DirName) == ".framework") {
923 SubmodulePath.push_back(llvm::sys::path::stem(DirName));
924 TopFrameworkDir = Dir;
928 // Try to infer a module map from the top-level framework directory.
929 Module *Result = ModMap.inferFrameworkModule(SubmodulePath.back(),
934 // Follow the submodule path to find the requested (sub)framework module
935 // within the top-level framework module.
936 SubmodulePath.pop_back();
937 while (!SubmodulePath.empty() && Result) {
938 Result = ModMap.lookupModuleQualified(SubmodulePath.back(), Result);
939 SubmodulePath.pop_back();
945 HeaderSearch::LoadModuleMapResult
946 HeaderSearch::loadModuleMapFile(StringRef DirName) {
947 if (const DirectoryEntry *Dir = FileMgr.getDirectory(DirName))
948 return loadModuleMapFile(Dir);
950 return LMM_NoDirectory;
953 HeaderSearch::LoadModuleMapResult
954 HeaderSearch::loadModuleMapFile(const DirectoryEntry *Dir) {
955 llvm::DenseMap<const DirectoryEntry *, bool>::iterator KnownDir
956 = DirectoryHasModuleMap.find(Dir);
957 if (KnownDir != DirectoryHasModuleMap.end())
958 return KnownDir->second? LMM_AlreadyLoaded : LMM_InvalidModuleMap;
960 SmallString<128> ModuleMapFileName;
961 ModuleMapFileName += Dir->getName();
962 unsigned ModuleMapDirNameLen = ModuleMapFileName.size();
963 llvm::sys::path::append(ModuleMapFileName, "module.map");
964 if (const FileEntry *ModuleMapFile = FileMgr.getFile(ModuleMapFileName)) {
965 // We have found a module map file. Try to parse it.
966 if (ModMap.parseModuleMapFile(ModuleMapFile)) {
967 // No suitable module map.
968 DirectoryHasModuleMap[Dir] = false;
969 return LMM_InvalidModuleMap;
972 // This directory has a module map.
973 DirectoryHasModuleMap[Dir] = true;
975 // Check whether there is a private module map that we need to load as well.
976 ModuleMapFileName.erase(ModuleMapFileName.begin() + ModuleMapDirNameLen,
977 ModuleMapFileName.end());
978 llvm::sys::path::append(ModuleMapFileName, "module_private.map");
979 if (const FileEntry *PrivateModuleMapFile
980 = FileMgr.getFile(ModuleMapFileName)) {
981 if (ModMap.parseModuleMapFile(PrivateModuleMapFile)) {
982 // No suitable module map.
983 DirectoryHasModuleMap[Dir] = false;
984 return LMM_InvalidModuleMap;
988 return LMM_NewlyLoaded;
991 // No suitable module map.
992 DirectoryHasModuleMap[Dir] = false;
993 return LMM_InvalidModuleMap;
996 void HeaderSearch::collectAllModules(llvm::SmallVectorImpl<Module *> &Modules) {
999 // Load module maps for each of the header search directories.
1000 for (unsigned Idx = 0, N = SearchDirs.size(); Idx != N; ++Idx) {
1001 if (SearchDirs[Idx].isFramework()) {
1002 llvm::error_code EC;
1003 SmallString<128> DirNative;
1004 llvm::sys::path::native(SearchDirs[Idx].getFrameworkDir()->getName(),
1007 // Search each of the ".framework" directories to load them as modules.
1008 bool IsSystem = SearchDirs[Idx].getDirCharacteristic() != SrcMgr::C_User;
1009 for (llvm::sys::fs::directory_iterator Dir(DirNative.str(), EC), DirEnd;
1010 Dir != DirEnd && !EC; Dir.increment(EC)) {
1011 if (llvm::sys::path::extension(Dir->path()) != ".framework")
1014 const DirectoryEntry *FrameworkDir = FileMgr.getDirectory(Dir->path());
1018 // Load this framework module.
1019 loadFrameworkModule(llvm::sys::path::stem(Dir->path()), FrameworkDir,
1025 // FIXME: Deal with header maps.
1026 if (SearchDirs[Idx].isHeaderMap())
1029 // Try to load a module map file for the search directory.
1030 loadModuleMapFile(SearchDirs[Idx].getDir());
1032 // Try to load module map files for immediate subdirectories of this search
1034 llvm::error_code EC;
1035 SmallString<128> DirNative;
1036 llvm::sys::path::native(SearchDirs[Idx].getDir()->getName(), DirNative);
1037 for (llvm::sys::fs::directory_iterator Dir(DirNative.str(), EC), DirEnd;
1038 Dir != DirEnd && !EC; Dir.increment(EC)) {
1039 loadModuleMapFile(Dir->path());
1043 // Populate the list of modules.
1044 for (ModuleMap::module_iterator M = ModMap.module_begin(),
1045 MEnd = ModMap.module_end();
1047 Modules.push_back(M->getValue());