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HeaderSearch.h
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1 //===- HeaderSearch.h - Resolve Header File Locations -----------*- C++ -*-===//
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 defines the HeaderSearch interface.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_CLANG_LEX_HEADERSEARCH_H
14 #define LLVM_CLANG_LEX_HEADERSEARCH_H
15 
19 #include "clang/Lex/HeaderMap.h"
20 #include "clang/Lex/ModuleMap.h"
21 #include "llvm/ADT/ArrayRef.h"
22 #include "llvm/ADT/DenseMap.h"
23 #include "llvm/ADT/StringMap.h"
24 #include "llvm/ADT/StringSet.h"
25 #include "llvm/ADT/StringRef.h"
26 #include "llvm/Support/Allocator.h"
27 #include <cassert>
28 #include <cstddef>
29 #include <memory>
30 #include <string>
31 #include <utility>
32 #include <vector>
33 
34 namespace clang {
35 
36 class DiagnosticsEngine;
37 class DirectoryEntry;
38 class ExternalPreprocessorSource;
39 class FileEntry;
40 class FileManager;
41 class HeaderSearchOptions;
42 class IdentifierInfo;
43 class LangOptions;
44 class Module;
45 class Preprocessor;
46 class TargetInfo;
47 
48 /// The preprocessor keeps track of this information for each
49 /// file that is \#included.
51  /// True if this is a \#import'd or \#pragma once file.
52  unsigned isImport : 1;
53 
54  /// True if this is a \#pragma once file.
55  unsigned isPragmaOnce : 1;
56 
57  /// Keep track of whether this is a system header, and if so,
58  /// whether it is C++ clean or not. This can be set by the include paths or
59  /// by \#pragma gcc system_header. This is an instance of
60  /// SrcMgr::CharacteristicKind.
61  unsigned DirInfo : 3;
62 
63  /// Whether this header file info was supplied by an external source,
64  /// and has not changed since.
65  unsigned External : 1;
66 
67  /// Whether this header is part of a module.
68  unsigned isModuleHeader : 1;
69 
70  /// Whether this header is part of the module that we are building.
72 
73  /// Whether this structure is considered to already have been
74  /// "resolved", meaning that it was loaded from the external source.
75  unsigned Resolved : 1;
76 
77  /// Whether this is a header inside a framework that is currently
78  /// being built.
79  ///
80  /// When a framework is being built, the headers have not yet been placed
81  /// into the appropriate framework subdirectories, and therefore are
82  /// provided via a header map. This bit indicates when this is one of
83  /// those framework headers.
84  unsigned IndexHeaderMapHeader : 1;
85 
86  /// Whether this file has been looked up as a header.
87  unsigned IsValid : 1;
88 
89  /// The number of times the file has been included already.
90  unsigned short NumIncludes = 0;
91 
92  /// The ID number of the controlling macro.
93  ///
94  /// This ID number will be non-zero when there is a controlling
95  /// macro whose IdentifierInfo may not yet have been loaded from
96  /// external storage.
97  unsigned ControllingMacroID = 0;
98 
99  /// If this file has a \#ifndef XXX (or equivalent) guard that
100  /// protects the entire contents of the file, this is the identifier
101  /// for the macro that controls whether or not it has any effect.
102  ///
103  /// Note: Most clients should use getControllingMacro() to access
104  /// the controlling macro of this header, since
105  /// getControllingMacro() is able to load a controlling macro from
106  /// external storage.
108 
109  /// If this header came from a framework include, this is the name
110  /// of the framework.
111  StringRef Framework;
112 
117 
118  /// Retrieve the controlling macro for this header file, if
119  /// any.
120  const IdentifierInfo *
122 
123  /// Determine whether this is a non-default header file info, e.g.,
124  /// it corresponds to an actual header we've included or tried to include.
125  bool isNonDefault() const {
126  return isImport || isPragmaOnce || NumIncludes || ControllingMacro ||
128  }
129 };
130 
131 /// An external source of header file information, which may supply
132 /// information about header files already included.
134 public:
135  virtual ~ExternalHeaderFileInfoSource();
136 
137  /// Retrieve the header file information for the given file entry.
138  ///
139  /// \returns Header file information for the given file entry, with the
140  /// \c External bit set. If the file entry is not known, return a
141  /// default-constructed \c HeaderFileInfo.
142  virtual HeaderFileInfo GetHeaderFileInfo(const FileEntry *FE) = 0;
143 };
144 
145 /// This structure is used to record entries in our framework cache.
147  /// The directory entry which should be used for the cached framework.
149 
150  /// Whether this framework has been "user-specified" to be treated as if it
151  /// were a system framework (even if it was found outside a system framework
152  /// directory).
154 };
155 
156 /// Encapsulates the information needed to find the file referenced
157 /// by a \#include or \#include_next, (sub-)framework lookup, etc.
159  friend class DirectoryLookup;
160 
161  /// Header-search options used to initialize this header search.
162  std::shared_ptr<HeaderSearchOptions> HSOpts;
163 
164  DiagnosticsEngine &Diags;
165  FileManager &FileMgr;
166 
167  /// \#include search path information. Requests for \#include "x" search the
168  /// directory of the \#including file first, then each directory in SearchDirs
169  /// consecutively. Requests for <x> search the current dir first, then each
170  /// directory in SearchDirs, starting at AngledDirIdx, consecutively. If
171  /// NoCurDirSearch is true, then the check for the file in the current
172  /// directory is suppressed.
173  std::vector<DirectoryLookup> SearchDirs;
174  unsigned AngledDirIdx = 0;
175  unsigned SystemDirIdx = 0;
176  bool NoCurDirSearch = false;
177 
178  /// \#include prefixes for which the 'system header' property is
179  /// overridden.
180  ///
181  /// For a \#include "x" or \#include <x> directive, the last string in this
182  /// list which is a prefix of 'x' determines whether the file is treated as
183  /// a system header.
184  std::vector<std::pair<std::string, bool>> SystemHeaderPrefixes;
185 
186  /// The path to the module cache.
187  std::string ModuleCachePath;
188 
189  /// All of the preprocessor-specific data about files that are
190  /// included, indexed by the FileEntry's UID.
191  mutable std::vector<HeaderFileInfo> FileInfo;
192 
193  /// Keeps track of each lookup performed by LookupFile.
194  struct LookupFileCacheInfo {
195  /// Starting index in SearchDirs that the cached search was performed from.
196  /// If there is a hit and this value doesn't match the current query, the
197  /// cache has to be ignored.
198  unsigned StartIdx = 0;
199 
200  /// The entry in SearchDirs that satisfied the query.
201  unsigned HitIdx = 0;
202 
203  /// This is non-null if the original filename was mapped to a framework
204  /// include via a headermap.
205  const char *MappedName = nullptr;
206 
207  /// Default constructor -- Initialize all members with zero.
208  LookupFileCacheInfo() = default;
209 
210  void reset(unsigned StartIdx) {
211  this->StartIdx = StartIdx;
212  this->MappedName = nullptr;
213  }
214  };
215  llvm::StringMap<LookupFileCacheInfo, llvm::BumpPtrAllocator> LookupFileCache;
216 
217  /// Collection mapping a framework or subframework
218  /// name like "Carbon" to the Carbon.framework directory.
219  llvm::StringMap<FrameworkCacheEntry, llvm::BumpPtrAllocator> FrameworkMap;
220 
221  /// Maps include file names (including the quotes or
222  /// angle brackets) to other include file names. This is used to support the
223  /// include_alias pragma for Microsoft compatibility.
224  using IncludeAliasMap =
225  llvm::StringMap<std::string, llvm::BumpPtrAllocator>;
226  std::unique_ptr<IncludeAliasMap> IncludeAliases;
227 
228  /// This is a mapping from FileEntry -> HeaderMap, uniquing headermaps.
229  std::vector<std::pair<const FileEntry *, std::unique_ptr<HeaderMap>>> HeaderMaps;
230 
231  /// The mapping between modules and headers.
232  mutable ModuleMap ModMap;
233 
234  /// Describes whether a given directory has a module map in it.
235  llvm::DenseMap<const DirectoryEntry *, bool> DirectoryHasModuleMap;
236 
237  /// Set of module map files we've already loaded, and a flag indicating
238  /// whether they were valid or not.
239  llvm::DenseMap<const FileEntry *, bool> LoadedModuleMaps;
240 
241  /// Uniqued set of framework names, which is used to track which
242  /// headers were included as framework headers.
243  llvm::StringSet<llvm::BumpPtrAllocator> FrameworkNames;
244 
245  /// Entity used to resolve the identifier IDs of controlling
246  /// macros into IdentifierInfo pointers, and keep the identifire up to date,
247  /// as needed.
248  ExternalPreprocessorSource *ExternalLookup = nullptr;
249 
250  /// Entity used to look up stored header file information.
251  ExternalHeaderFileInfoSource *ExternalSource = nullptr;
252 
253 public:
254  HeaderSearch(std::shared_ptr<HeaderSearchOptions> HSOpts,
255  SourceManager &SourceMgr, DiagnosticsEngine &Diags,
256  const LangOptions &LangOpts, const TargetInfo *Target);
257  HeaderSearch(const HeaderSearch &) = delete;
258  HeaderSearch &operator=(const HeaderSearch &) = delete;
259 
260  /// Retrieve the header-search options with which this header search
261  /// was initialized.
262  HeaderSearchOptions &getHeaderSearchOpts() const { return *HSOpts; }
263 
264  FileManager &getFileMgr() const { return FileMgr; }
265 
266  DiagnosticsEngine &getDiags() const { return Diags; }
267 
268  /// Interface for setting the file search paths.
269  void SetSearchPaths(const std::vector<DirectoryLookup> &dirs,
270  unsigned angledDirIdx, unsigned systemDirIdx,
271  bool noCurDirSearch) {
272  assert(angledDirIdx <= systemDirIdx && systemDirIdx <= dirs.size() &&
273  "Directory indices are unordered");
274  SearchDirs = dirs;
275  AngledDirIdx = angledDirIdx;
276  SystemDirIdx = systemDirIdx;
277  NoCurDirSearch = noCurDirSearch;
278  //LookupFileCache.clear();
279  }
280 
281  /// Add an additional search path.
282  void AddSearchPath(const DirectoryLookup &dir, bool isAngled) {
283  unsigned idx = isAngled ? SystemDirIdx : AngledDirIdx;
284  SearchDirs.insert(SearchDirs.begin() + idx, dir);
285  if (!isAngled)
286  AngledDirIdx++;
287  SystemDirIdx++;
288  }
289 
290  /// Set the list of system header prefixes.
291  void SetSystemHeaderPrefixes(ArrayRef<std::pair<std::string, bool>> P) {
292  SystemHeaderPrefixes.assign(P.begin(), P.end());
293  }
294 
295  /// Checks whether the map exists or not.
296  bool HasIncludeAliasMap() const { return (bool)IncludeAliases; }
297 
298  /// Map the source include name to the dest include name.
299  ///
300  /// The Source should include the angle brackets or quotes, the dest
301  /// should not. This allows for distinction between <> and "" headers.
302  void AddIncludeAlias(StringRef Source, StringRef Dest) {
303  if (!IncludeAliases)
304  IncludeAliases.reset(new IncludeAliasMap);
305  (*IncludeAliases)[Source] = Dest;
306  }
307 
308  /// Maps one header file name to a different header
309  /// file name, for use with the include_alias pragma. Note that the source
310  /// file name should include the angle brackets or quotes. Returns StringRef
311  /// as null if the header cannot be mapped.
312  StringRef MapHeaderToIncludeAlias(StringRef Source) {
313  assert(IncludeAliases && "Trying to map headers when there's no map");
314 
315  // Do any filename replacements before anything else
316  IncludeAliasMap::const_iterator Iter = IncludeAliases->find(Source);
317  if (Iter != IncludeAliases->end())
318  return Iter->second;
319  return {};
320  }
321 
322  /// Set the path to the module cache.
323  void setModuleCachePath(StringRef CachePath) {
324  ModuleCachePath = CachePath;
325  }
326 
327  /// Retrieve the path to the module cache.
328  StringRef getModuleCachePath() const { return ModuleCachePath; }
329 
330  /// Consider modules when including files from this directory.
332  DirectoryHasModuleMap[Dir] = true;
333  }
334 
335  /// Forget everything we know about headers so far.
336  void ClearFileInfo() {
337  FileInfo.clear();
338  }
339 
341  ExternalLookup = EPS;
342  }
343 
345  return ExternalLookup;
346  }
347 
348  /// Set the external source of header information.
350  ExternalSource = ES;
351  }
352 
353  /// Set the target information for the header search, if not
354  /// already known.
355  void setTarget(const TargetInfo &Target);
356 
357  /// Given a "foo" or <foo> reference, look up the indicated file,
358  /// return null on failure.
359  ///
360  /// \returns If successful, this returns 'UsedDir', the DirectoryLookup member
361  /// the file was found in, or null if not applicable.
362  ///
363  /// \param IncludeLoc Used for diagnostics if valid.
364  ///
365  /// \param isAngled indicates whether the file reference is a <> reference.
366  ///
367  /// \param CurDir If non-null, the file was found in the specified directory
368  /// search location. This is used to implement \#include_next.
369  ///
370  /// \param Includers Indicates where the \#including file(s) are, in case
371  /// relative searches are needed. In reverse order of inclusion.
372  ///
373  /// \param SearchPath If non-null, will be set to the search path relative
374  /// to which the file was found. If the include path is absolute, SearchPath
375  /// will be set to an empty string.
376  ///
377  /// \param RelativePath If non-null, will be set to the path relative to
378  /// SearchPath at which the file was found. This only differs from the
379  /// Filename for framework includes.
380  ///
381  /// \param SuggestedModule If non-null, and the file found is semantically
382  /// part of a known module, this will be set to the module that should
383  /// be imported instead of preprocessing/parsing the file found.
384  ///
385  /// \param IsMapped If non-null, and the search involved header maps, set to
386  /// true.
387  ///
388  /// \param IsFrameworkFound If non-null, will be set to true if a framework is
389  /// found in any of searched SearchDirs. Will be set to false if a framework
390  /// is found only through header maps. Doesn't guarantee the requested file is
391  /// found.
392  Optional<FileEntryRef> LookupFile(
393  StringRef Filename, SourceLocation IncludeLoc, bool isAngled,
394  const DirectoryLookup *FromDir, const DirectoryLookup *&CurDir,
395  ArrayRef<std::pair<const FileEntry *, const DirectoryEntry *>> Includers,
396  SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
397  Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule,
398  bool *IsMapped, bool *IsFrameworkFound, bool SkipCache = false,
399  bool BuildSystemModule = false);
400 
401  /// Look up a subframework for the specified \#include file.
402  ///
403  /// For example, if \#include'ing <HIToolbox/HIToolbox.h> from
404  /// within ".../Carbon.framework/Headers/Carbon.h", check to see if
405  /// HIToolbox is a subframework within Carbon.framework. If so, return
406  /// the FileEntry for the designated file, otherwise return null.
407  Optional<FileEntryRef> LookupSubframeworkHeader(
408  StringRef Filename, const FileEntry *ContextFileEnt,
409  SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
410  Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule);
411 
412  /// Look up the specified framework name in our framework cache.
413  /// \returns The DirectoryEntry it is in if we know, null otherwise.
415  return FrameworkMap[FWName];
416  }
417 
418  /// Mark the specified file as a target of a \#include,
419  /// \#include_next, or \#import directive.
420  ///
421  /// \return false if \#including the file will have no effect or true
422  /// if we should include it.
423  bool ShouldEnterIncludeFile(Preprocessor &PP, const FileEntry *File,
424  bool isImport, bool ModulesEnabled,
425  Module *M);
426 
427  /// Return whether the specified file is a normal header,
428  /// a system header, or a C++ friendly system header.
430  return (SrcMgr::CharacteristicKind)getFileInfo(File).DirInfo;
431  }
432 
433  /// Mark the specified file as a "once only" file, e.g. due to
434  /// \#pragma once.
435  void MarkFileIncludeOnce(const FileEntry *File) {
436  HeaderFileInfo &FI = getFileInfo(File);
437  FI.isImport = true;
438  FI.isPragmaOnce = true;
439  }
440 
441  /// Mark the specified file as a system header, e.g. due to
442  /// \#pragma GCC system_header.
443  void MarkFileSystemHeader(const FileEntry *File) {
444  getFileInfo(File).DirInfo = SrcMgr::C_System;
445  }
446 
447  /// Mark the specified file as part of a module.
448  void MarkFileModuleHeader(const FileEntry *FE,
451 
452  /// Increment the count for the number of times the specified
453  /// FileEntry has been entered.
454  void IncrementIncludeCount(const FileEntry *File) {
455  ++getFileInfo(File).NumIncludes;
456  }
457 
458  /// Mark the specified file as having a controlling macro.
459  ///
460  /// This is used by the multiple-include optimization to eliminate
461  /// no-op \#includes.
464  getFileInfo(File).ControllingMacro = ControllingMacro;
465  }
466 
467  /// Return true if this is the first time encountering this header.
468  bool FirstTimeLexingFile(const FileEntry *File) {
469  return getFileInfo(File).NumIncludes == 1;
470  }
471 
472  /// Determine whether this file is intended to be safe from
473  /// multiple inclusions, e.g., it has \#pragma once or a controlling
474  /// macro.
475  ///
476  /// This routine does not consider the effect of \#import
477  bool isFileMultipleIncludeGuarded(const FileEntry *File);
478 
479  /// This method returns a HeaderMap for the specified
480  /// FileEntry, uniquing them through the 'HeaderMaps' datastructure.
481  const HeaderMap *CreateHeaderMap(const FileEntry *FE);
482 
483  /// Get filenames for all registered header maps.
484  void getHeaderMapFileNames(SmallVectorImpl<std::string> &Names) const;
485 
486  /// Retrieve the name of the cached module file that should be used
487  /// to load the given module.
488  ///
489  /// \param Module The module whose module file name will be returned.
490  ///
491  /// \returns The name of the module file that corresponds to this module,
492  /// or an empty string if this module does not correspond to any module file.
493  std::string getCachedModuleFileName(Module *Module);
494 
495  /// Retrieve the name of the prebuilt module file that should be used
496  /// to load a module with the given name.
497  ///
498  /// \param ModuleName The module whose module file name will be returned.
499  ///
500  /// \param FileMapOnly If true, then only look in the explicit module name
501  // to file name map and skip the directory search.
502  ///
503  /// \returns The name of the module file that corresponds to this module,
504  /// or an empty string if this module does not correspond to any module file.
505  std::string getPrebuiltModuleFileName(StringRef ModuleName,
506  bool FileMapOnly = false);
507 
508  /// Retrieve the name of the (to-be-)cached module file that should
509  /// be used to load a module with the given name.
510  ///
511  /// \param ModuleName The module whose module file name will be returned.
512  ///
513  /// \param ModuleMapPath A path that when combined with \c ModuleName
514  /// uniquely identifies this module. See Module::ModuleMap.
515  ///
516  /// \returns The name of the module file that corresponds to this module,
517  /// or an empty string if this module does not correspond to any module file.
518  std::string getCachedModuleFileName(StringRef ModuleName,
519  StringRef ModuleMapPath);
520 
521  /// Lookup a module Search for a module with the given name.
522  ///
523  /// \param ModuleName The name of the module we're looking for.
524  ///
525  /// \param AllowSearch Whether we are allowed to search in the various
526  /// search directories to produce a module definition. If not, this lookup
527  /// will only return an already-known module.
528  ///
529  /// \param AllowExtraModuleMapSearch Whether we allow to search modulemaps
530  /// in subdirectories.
531  ///
532  /// \returns The module with the given name.
533  Module *lookupModule(StringRef ModuleName, bool AllowSearch = true,
534  bool AllowExtraModuleMapSearch = false);
535 
536  /// Try to find a module map file in the given directory, returning
537  /// \c nullptr if none is found.
538  const FileEntry *lookupModuleMapFile(const DirectoryEntry *Dir,
539  bool IsFramework);
540 
541  /// Determine whether there is a module map that may map the header
542  /// with the given file name to a (sub)module.
543  /// Always returns false if modules are disabled.
544  ///
545  /// \param Filename The name of the file.
546  ///
547  /// \param Root The "root" directory, at which we should stop looking for
548  /// module maps.
549  ///
550  /// \param IsSystem Whether the directories we're looking at are system
551  /// header directories.
552  bool hasModuleMap(StringRef Filename, const DirectoryEntry *Root,
553  bool IsSystem);
554 
555  /// Retrieve the module that corresponds to the given file, if any.
556  ///
557  /// \param File The header that we wish to map to a module.
558  /// \param AllowTextual Whether we want to find textual headers too.
559  ModuleMap::KnownHeader findModuleForHeader(const FileEntry *File,
560  bool AllowTextual = false) const;
561 
562  /// Read the contents of the given module map file.
563  ///
564  /// \param File The module map file.
565  /// \param IsSystem Whether this file is in a system header directory.
566  /// \param ID If the module map file is already mapped (perhaps as part of
567  /// processing a preprocessed module), the ID of the file.
568  /// \param Offset [inout] An offset within ID to start parsing. On exit,
569  /// filled by the end of the parsed contents (either EOF or the
570  /// location of an end-of-module-map pragma).
571  /// \param OriginalModuleMapFile The original path to the module map file,
572  /// used to resolve paths within the module (this is required when
573  /// building the module from preprocessed source).
574  /// \returns true if an error occurred, false otherwise.
575  bool loadModuleMapFile(const FileEntry *File, bool IsSystem,
576  FileID ID = FileID(), unsigned *Offset = nullptr,
577  StringRef OriginalModuleMapFile = StringRef());
578 
579  /// Collect the set of all known, top-level modules.
580  ///
581  /// \param Modules Will be filled with the set of known, top-level modules.
582  void collectAllModules(SmallVectorImpl<Module *> &Modules);
583 
584  /// Load all known, top-level system modules.
585  void loadTopLevelSystemModules();
586 
587 private:
588  /// Lookup a module with the given module name and search-name.
589  ///
590  /// \param ModuleName The name of the module we're looking for.
591  ///
592  /// \param SearchName The "search-name" to derive filesystem paths from
593  /// when looking for the module map; this is usually equal to ModuleName,
594  /// but for compatibility with some buggy frameworks, additional attempts
595  /// may be made to find the module under a related-but-different search-name.
596  ///
597  /// \param AllowExtraModuleMapSearch Whether we allow to search modulemaps
598  /// in subdirectories.
599  ///
600  /// \returns The module named ModuleName.
601  Module *lookupModule(StringRef ModuleName, StringRef SearchName,
602  bool AllowExtraModuleMapSearch = false);
603 
604  /// Retrieve a module with the given name, which may be part of the
605  /// given framework.
606  ///
607  /// \param Name The name of the module to retrieve.
608  ///
609  /// \param Dir The framework directory (e.g., ModuleName.framework).
610  ///
611  /// \param IsSystem Whether the framework directory is part of the system
612  /// frameworks.
613  ///
614  /// \returns The module, if found; otherwise, null.
615  Module *loadFrameworkModule(StringRef Name,
616  const DirectoryEntry *Dir,
617  bool IsSystem);
618 
619  /// Load all of the module maps within the immediate subdirectories
620  /// of the given search directory.
621  void loadSubdirectoryModuleMaps(DirectoryLookup &SearchDir);
622 
623  /// Find and suggest a usable module for the given file.
624  ///
625  /// \return \c true if the file can be used, \c false if we are not permitted to
626  /// find this file due to requirements from \p RequestingModule.
627  bool findUsableModuleForHeader(const FileEntry *File,
628  const DirectoryEntry *Root,
629  Module *RequestingModule,
630  ModuleMap::KnownHeader *SuggestedModule,
631  bool IsSystemHeaderDir);
632 
633  /// Find and suggest a usable module for the given file, which is part of
634  /// the specified framework.
635  ///
636  /// \return \c true if the file can be used, \c false if we are not permitted to
637  /// find this file due to requirements from \p RequestingModule.
638  bool findUsableModuleForFrameworkHeader(
639  const FileEntry *File, StringRef FrameworkName, Module *RequestingModule,
640  ModuleMap::KnownHeader *SuggestedModule, bool IsSystemFramework);
641 
642  /// Look up the file with the specified name and determine its owning
643  /// module.
645  getFileAndSuggestModule(StringRef FileName, SourceLocation IncludeLoc,
646  const DirectoryEntry *Dir, bool IsSystemHeaderDir,
647  Module *RequestingModule,
648  ModuleMap::KnownHeader *SuggestedModule);
649 
650 public:
651  /// Retrieve the module map.
652  ModuleMap &getModuleMap() { return ModMap; }
653 
654  /// Retrieve the module map.
655  const ModuleMap &getModuleMap() const { return ModMap; }
656 
657  unsigned header_file_size() const { return FileInfo.size(); }
658 
659  /// Return the HeaderFileInfo structure for the specified FileEntry,
660  /// in preparation for updating it in some way.
661  HeaderFileInfo &getFileInfo(const FileEntry *FE);
662 
663  /// Return the HeaderFileInfo structure for the specified FileEntry,
664  /// if it has ever been filled in.
665  /// \param WantExternal Whether the caller wants purely-external header file
666  /// info (where \p External is true).
667  const HeaderFileInfo *getExistingFileInfo(const FileEntry *FE,
668  bool WantExternal = true) const;
669 
670  // Used by external tools
671  using search_dir_iterator = std::vector<DirectoryLookup>::const_iterator;
672 
673  search_dir_iterator search_dir_begin() const { return SearchDirs.begin(); }
674  search_dir_iterator search_dir_end() const { return SearchDirs.end(); }
675  unsigned search_dir_size() const { return SearchDirs.size(); }
676 
678  return SearchDirs.begin();
679  }
680 
682  return SearchDirs.begin() + AngledDirIdx;
683  }
684 
686  return SearchDirs.begin() + AngledDirIdx;
687  }
688 
690  return SearchDirs.begin() + SystemDirIdx;
691  }
692 
694  return SearchDirs.begin() + SystemDirIdx;
695  }
696 
697  search_dir_iterator system_dir_end() const { return SearchDirs.end(); }
698 
699  /// Retrieve a uniqued framework name.
700  StringRef getUniqueFrameworkName(StringRef Framework);
701 
702  /// Suggest a path by which the specified file could be found, for use in
703  /// diagnostics to suggest a #include. Returned path will only contain forward
704  /// slashes as separators. MainFile is the absolute path of the file that we
705  /// are generating the diagnostics for. It will try to shorten the path using
706  /// MainFile location, if none of the include search directories were prefix
707  /// of File.
708  ///
709  /// \param IsSystem If non-null, filled in to indicate whether the suggested
710  /// path is relative to a system header directory.
711  std::string suggestPathToFileForDiagnostics(const FileEntry *File,
712  llvm::StringRef MainFile,
713  bool *IsSystem = nullptr);
714 
715  /// Suggest a path by which the specified file could be found, for use in
716  /// diagnostics to suggest a #include. Returned path will only contain forward
717  /// slashes as separators. MainFile is the absolute path of the file that we
718  /// are generating the diagnostics for. It will try to shorten the path using
719  /// MainFile location, if none of the include search directories were prefix
720  /// of File.
721  ///
722  /// \param WorkingDir If non-empty, this will be prepended to search directory
723  /// paths that are relative.
724  std::string suggestPathToFileForDiagnostics(llvm::StringRef File,
725  llvm::StringRef WorkingDir,
726  llvm::StringRef MainFile,
727  bool *IsSystem = nullptr);
728 
729  void PrintStats();
730 
731  size_t getTotalMemory() const;
732 
733 private:
734  /// Describes what happened when we tried to load a module map file.
735  enum LoadModuleMapResult {
736  /// The module map file had already been loaded.
737  LMM_AlreadyLoaded,
738 
739  /// The module map file was loaded by this invocation.
740  LMM_NewlyLoaded,
741 
742  /// There is was directory with the given name.
743  LMM_NoDirectory,
744 
745  /// There was either no module map file or the module map file was
746  /// invalid.
747  LMM_InvalidModuleMap
748  };
749 
750  LoadModuleMapResult loadModuleMapFileImpl(const FileEntry *File,
751  bool IsSystem,
752  const DirectoryEntry *Dir,
753  FileID ID = FileID(),
754  unsigned *Offset = nullptr);
755 
756  /// Try to load the module map file in the given directory.
757  ///
758  /// \param DirName The name of the directory where we will look for a module
759  /// map file.
760  /// \param IsSystem Whether this is a system header directory.
761  /// \param IsFramework Whether this is a framework directory.
762  ///
763  /// \returns The result of attempting to load the module map file from the
764  /// named directory.
765  LoadModuleMapResult loadModuleMapFile(StringRef DirName, bool IsSystem,
766  bool IsFramework);
767 
768  /// Try to load the module map file in the given directory.
769  ///
770  /// \param Dir The directory where we will look for a module map file.
771  /// \param IsSystem Whether this is a system header directory.
772  /// \param IsFramework Whether this is a framework directory.
773  ///
774  /// \returns The result of attempting to load the module map file from the
775  /// named directory.
776  LoadModuleMapResult loadModuleMapFile(const DirectoryEntry *Dir,
777  bool IsSystem, bool IsFramework);
778 };
779 
780 } // namespace clang
781 
782 #endif // LLVM_CLANG_LEX_HEADERSEARCH_H
unsigned DirInfo
Keep track of whether this is a system header, and if so, whether it is C++ clean or not...
Definition: HeaderSearch.h:61
Implements support for file system lookup, file system caching, and directory search management...
Definition: FileManager.h:171
unsigned isPragmaOnce
True if this is a #pragma once file.
Definition: HeaderSearch.h:55
Defines the SourceManager interface.
void SetSearchPaths(const std::vector< DirectoryLookup > &dirs, unsigned angledDirIdx, unsigned systemDirIdx, bool noCurDirSearch)
Interface for setting the file search paths.
Definition: HeaderSearch.h:269
StringRef P
search_dir_iterator angled_dir_end() const
Definition: HeaderSearch.h:689
FrameworkCacheEntry & LookupFrameworkCache(StringRef FWName)
Look up the specified framework name in our framework cache.
Definition: HeaderSearch.h:414
bool HasIncludeAliasMap() const
Checks whether the map exists or not.
Definition: HeaderSearch.h:296
CharacteristicKind
Indicates whether a file or directory holds normal user code, system code, or system code which is im...
Definition: SourceManager.h:77
ModuleMap & getModuleMap()
Retrieve the module map.
Definition: HeaderSearch.h:652
unsigned isCompilingModuleHeader
Whether this header is part of the module that we are building.
Definition: HeaderSearch.h:71
unsigned isImport
True if this is a #import&#39;d or #pragma once file.
Definition: HeaderSearch.h:52
void ClearFileInfo()
Forget everything we know about headers so far.
Definition: HeaderSearch.h:336
DiagnosticsEngine & getDiags() const
Definition: HeaderSearch.h:266
One of these records is kept for each identifier that is lexed.
This class represents an Apple concept known as a &#39;header map&#39;.
Definition: HeaderMap.h:65
FileManager & getFileMgr() const
Definition: HeaderSearch.h:264
const IdentifierInfo * getControllingMacro(ExternalPreprocessorSource *External)
Retrieve the controlling macro for this header file, if any.
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:49
Describes a module or submodule.
Definition: Module.h:64
unsigned External
Whether this header file info was supplied by an external source, and has not changed since...
Definition: HeaderSearch.h:65
void AddIncludeAlias(StringRef Source, StringRef Dest)
Map the source include name to the dest include name.
Definition: HeaderSearch.h:302
bool IsUserSpecifiedSystemFramework
Whether this framework has been "user-specified" to be treated as if it were a system framework (even...
Definition: HeaderSearch.h:153
search_dir_iterator search_dir_begin() const
Definition: HeaderSearch.h:673
search_dir_iterator quoted_dir_end() const
Definition: HeaderSearch.h:681
Concrete class used by the front-end to report problems and issues.
Definition: Diagnostic.h:149
unsigned short NumIncludes
The number of times the file has been included already.
Definition: HeaderSearch.h:90
search_dir_iterator search_dir_end() const
Definition: HeaderSearch.h:674
unsigned Resolved
Whether this structure is considered to already have been "resolved", meaning that it was loaded from...
Definition: HeaderSearch.h:75
The preprocessor keeps track of this information for each file that is #included. ...
Definition: HeaderSearch.h:50
unsigned header_file_size() const
Definition: HeaderSearch.h:657
Encapsulates the information needed to find the file referenced by a #include or #include_next, (sub-)framework lookup, etc.
Definition: HeaderSearch.h:158
StringRef getModuleCachePath() const
Retrieve the path to the module cache.
Definition: HeaderSearch.h:328
const ModuleMap & getModuleMap() const
Retrieve the module map.
Definition: HeaderSearch.h:655
ModuleHeaderRole
Flags describing the role of a module header.
Definition: ModuleMap.h:123
StringRef Filename
Definition: Format.cpp:1807
unsigned Offset
Definition: Format.cpp:1809
Exposes information about the current target.
Definition: TargetInfo.h:163
Abstract interface for external sources of preprocessor information.
HeaderSearchOptions & getHeaderSearchOpts() const
Retrieve the header-search options with which this header search was initialized. ...
Definition: HeaderSearch.h:262
search_dir_iterator quoted_dir_begin() const
Definition: HeaderSearch.h:677
search_dir_iterator system_dir_end() const
Definition: HeaderSearch.h:697
void IncrementIncludeCount(const FileEntry *File)
Increment the count for the number of times the specified FileEntry has been entered.
Definition: HeaderSearch.h:454
DirectoryLookup - This class represents one entry in the search list that specifies the search order ...
const DirectoryEntry * Directory
The directory entry which should be used for the cached framework.
Definition: HeaderSearch.h:148
SrcMgr::CharacteristicKind getFileDirFlavor(const FileEntry *File)
Return whether the specified file is a normal header, a system header, or a C++ friendly system heade...
Definition: HeaderSearch.h:429
unsigned isModuleHeader
Whether this header is part of a module.
Definition: HeaderSearch.h:68
#define false
Definition: stdbool.h:17
Encodes a location in the source.
search_dir_iterator system_dir_begin() const
Definition: HeaderSearch.h:693
Cached information about one file (either on disk or in the virtual file system). ...
Definition: FileManager.h:78
const IdentifierInfo * ControllingMacro
If this file has a #ifndef XXX (or equivalent) guard that protects the entire contents of the file...
Definition: HeaderSearch.h:107
An opaque identifier used by SourceManager which refers to a source file (MemoryBuffer) along with it...
unsigned ControllingMacroID
The ID number of the controlling macro.
Definition: HeaderSearch.h:97
Dataflow Directional Tag Classes.
An external source of header file information, which may supply information about header files alread...
Definition: HeaderSearch.h:133
bool isNonDefault() const
Determine whether this is a non-default header file info, e.g., it corresponds to an actual header we...
Definition: HeaderSearch.h:125
void SetExternalSource(ExternalHeaderFileInfoSource *ES)
Set the external source of header information.
Definition: HeaderSearch.h:349
std::vector< DirectoryLookup >::const_iterator search_dir_iterator
Definition: HeaderSearch.h:671
void AddSearchPath(const DirectoryLookup &dir, bool isAngled)
Add an additional search path.
Definition: HeaderSearch.h:282
search_dir_iterator angled_dir_begin() const
Definition: HeaderSearch.h:685
Cached information about one directory (either on disk or in the virtual file system).
Definition: FileManager.h:45
StringRef Framework
If this header came from a framework include, this is the name of the framework.
Definition: HeaderSearch.h:111
Defines the clang::SourceLocation class and associated facilities.
void setDirectoryHasModuleMap(const DirectoryEntry *Dir)
Consider modules when including files from this directory.
Definition: HeaderSearch.h:331
void SetSystemHeaderPrefixes(ArrayRef< std::pair< std::string, bool >> P)
Set the list of system header prefixes.
Definition: HeaderSearch.h:291
HeaderSearchOptions - Helper class for storing options related to the initialization of the HeaderSea...
StringRef MapHeaderToIncludeAlias(StringRef Source)
Maps one header file name to a different header file name, for use with the include_alias pragma...
Definition: HeaderSearch.h:312
bool FirstTimeLexingFile(const FileEntry *File)
Return true if this is the first time encountering this header.
Definition: HeaderSearch.h:468
void SetExternalLookup(ExternalPreprocessorSource *EPS)
Definition: HeaderSearch.h:340
unsigned IndexHeaderMapHeader
Whether this is a header inside a framework that is currently being built.
Definition: HeaderSearch.h:84
unsigned IsValid
Whether this file has been looked up as a header.
Definition: HeaderSearch.h:87
void MarkFileSystemHeader(const FileEntry *File)
Mark the specified file as a system header, e.g.
Definition: HeaderSearch.h:443
This structure is used to record entries in our framework cache.
Definition: HeaderSearch.h:146
unsigned search_dir_size() const
Definition: HeaderSearch.h:675
A header that is known to reside within a given module, whether it was included or excluded...
Definition: ModuleMap.h:150
void MarkFileIncludeOnce(const FileEntry *File)
Mark the specified file as a "once only" file, e.g.
Definition: HeaderSearch.h:435
void setModuleCachePath(StringRef CachePath)
Set the path to the module cache.
Definition: HeaderSearch.h:323
This class handles loading and caching of source files into memory.
ExternalPreprocessorSource * getExternalLookup() const
Definition: HeaderSearch.h:344
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:125
void SetFileControllingMacro(const FileEntry *File, const IdentifierInfo *ControllingMacro)
Mark the specified file as having a controlling macro.
Definition: HeaderSearch.h:462