Coverage Report

Created: 2020-09-19 12:23

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/include/clang/Lex/HeaderSearch.h
Line
Count
Source (jump to first uncovered line)
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
16
#include "clang/Basic/SourceLocation.h"
17
#include "clang/Basic/SourceManager.h"
18
#include "clang/Lex/DirectoryLookup.h"
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.
50
struct HeaderFileInfo {
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.
71
  unsigned isCompilingModuleHeader : 1;
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.
107
  const IdentifierInfo *ControllingMacro = nullptr;
108
109
  /// If this header came from a framework include, this is the name
110
  /// of the framework.
111
  StringRef Framework;
112
113
  HeaderFileInfo()
114
      : isImport(false), isPragmaOnce(false), DirInfo(SrcMgr::C_User),
115
        External(false), isModuleHeader(false), isCompilingModuleHeader(false),
116
2.99M
        Resolved(false), IndexHeaderMapHeader(false), IsValid(false)  {}
117
118
  /// Retrieve the controlling macro for this header file, if
119
  /// any.
120
  const IdentifierInfo *
121
  getControllingMacro(ExternalPreprocessorSource *External);
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
0
  bool isNonDefault() const {
126
0
    return isImport || isPragmaOnce || NumIncludes || ControllingMacro ||
127
0
      ControllingMacroID;
128
0
  }
129
};
130
131
/// An external source of header file information, which may supply
132
/// information about header files already included.
133
class ExternalHeaderFileInfoSource {
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.
146
struct FrameworkCacheEntry {
147
  /// The directory entry which should be used for the cached framework.
148
  const DirectoryEntry *Directory;
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).
153
  bool IsUserSpecifiedSystemFramework;
154
};
155
156
/// Encapsulates the information needed to find the file referenced
157
/// by a \#include or \#include_next, (sub-)framework lookup, etc.
158
class HeaderSearch {
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
750k
    LookupFileCacheInfo() = default;
209
210
776k
    void reset(unsigned StartIdx) {
211
776k
      this->StartIdx = StartIdx;
212
776k
      this->MappedName = nullptr;
213
776k
    }
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
8.32M
  HeaderSearchOptions &getHeaderSearchOpts() const { return *HSOpts; }
263
264
6.13M
  FileManager &getFileMgr() const { return FileMgr; }
265
266
7
  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
80.7k
                      bool noCurDirSearch) {
272
80.7k
    assert(angledDirIdx <= systemDirIdx && systemDirIdx <= dirs.size() &&
273
80.7k
        "Directory indices are unordered");
274
80.7k
    SearchDirs = dirs;
275
80.7k
    AngledDirIdx = angledDirIdx;
276
80.7k
    SystemDirIdx = systemDirIdx;
277
80.7k
    NoCurDirSearch = noCurDirSearch;
278
    //LookupFileCache.clear();
279
80.7k
  }
280
281
  /// Add an additional search path.
282
17
  void AddSearchPath(const DirectoryLookup &dir, bool isAngled) {
283
15
    unsigned idx = isAngled ? 
SystemDirIdx2
: AngledDirIdx;
284
17
    SearchDirs.insert(SearchDirs.begin() + idx, dir);
285
17
    if (!isAngled)
286
15
      AngledDirIdx++;
287
17
    SystemDirIdx++;
288
17
  }
289
290
  /// Set the list of system header prefixes.
291
80.7k
  void SetSystemHeaderPrefixes(ArrayRef<std::pair<std::string, bool>> P) {
292
80.7k
    SystemHeaderPrefixes.assign(P.begin(), P.end());
293
80.7k
  }
294
295
  /// Checks whether the map exists or not.
296
2.32M
  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
14
  void AddIncludeAlias(StringRef Source, StringRef Dest) {
303
14
    if (!IncludeAliases)
304
2
      IncludeAliases.reset(new IncludeAliasMap);
305
14
    (*IncludeAliases)[Source] = std::string(Dest);
306
14
  }
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
8
  StringRef MapHeaderToIncludeAlias(StringRef Source) {
313
8
    assert(IncludeAliases && "Trying to map headers when there's no map");
314
8
315
    // Do any filename replacements before anything else
316
8
    IncludeAliasMap::const_iterator Iter = IncludeAliases->find(Source);
317
8
    if (Iter != IncludeAliases->end())
318
6
      return Iter->second;
319
2
    return {};
320
2
  }
321
322
  /// Set the path to the module cache.
323
6.82k
  void setModuleCachePath(StringRef CachePath) {
324
6.82k
    ModuleCachePath = std::string(CachePath);
325
6.82k
  }
326
327
  /// Retrieve the path to the module cache.
328
32.1k
  StringRef getModuleCachePath() const { return ModuleCachePath; }
329
330
  /// Consider modules when including files from this directory.
331
0
  void setDirectoryHasModuleMap(const DirectoryEntry* Dir) {
332
0
    DirectoryHasModuleMap[Dir] = true;
333
0
  }
334
335
  /// Forget everything we know about headers so far.
336
0
  void ClearFileInfo() {
337
0
    FileInfo.clear();
338
0
  }
339
340
7.17k
  void SetExternalLookup(ExternalPreprocessorSource *EPS) {
341
7.17k
    ExternalLookup = EPS;
342
7.17k
  }
343
344
21.8k
  ExternalPreprocessorSource *getExternalLookup() const {
345
21.8k
    return ExternalLookup;
346
21.8k
  }
347
348
  /// Set the external source of header information.
349
21.8k
  void SetExternalSource(ExternalHeaderFileInfoSource *ES) {
350
21.8k
    ExternalSource = ES;
351
21.8k
  }
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.
414
879k
  FrameworkCacheEntry &LookupFrameworkCache(StringRef FWName) {
415
879k
    return FrameworkMap[FWName];
416
879k
  }
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.
429
2.34M
  SrcMgr::CharacteristicKind getFileDirFlavor(const FileEntry *File) {
430
2.34M
    return (SrcMgr::CharacteristicKind)getFileInfo(File).DirInfo;
431
2.34M
  }
432
433
  /// Mark the specified file as a "once only" file, e.g. due to
434
  /// \#pragma once.
435
293
  void MarkFileIncludeOnce(const FileEntry *File) {
436
293
    HeaderFileInfo &FI = getFileInfo(File);
437
293
    FI.isImport = true;
438
293
    FI.isPragmaOnce = true;
439
293
  }
440
441
  /// Mark the specified file as a system header, e.g. due to
442
  /// \#pragma GCC system_header.
443
47.8k
  void MarkFileSystemHeader(const FileEntry *File) {
444
47.8k
    getFileInfo(File).DirInfo = SrcMgr::C_System;
445
47.8k
  }
446
447
  /// Mark the specified file as part of a module.
448
  void MarkFileModuleHeader(const FileEntry *FE,
449
                            ModuleMap::ModuleHeaderRole Role,
450
                            bool isCompilingModuleHeader);
451
452
  /// Increment the count for the number of times the specified
453
  /// FileEntry has been entered.
454
70.7k
  void IncrementIncludeCount(const FileEntry *File) {
455
70.7k
    ++getFileInfo(File).NumIncludes;
456
70.7k
  }
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.
462
  void SetFileControllingMacro(const FileEntry *File,
463
618k
                               const IdentifierInfo *ControllingMacro) {
464
618k
    getFileInfo(File).ControllingMacro = ControllingMacro;
465
618k
  }
466
467
  /// Return true if this is the first time encountering this header.
468
14
  bool FirstTimeLexingFile(const FileEntry *File) {
469
14
    return getFileInfo(File).NumIncludes == 1;
470
14
  }
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
  /// Determine whether the given file is known to have ever been \#imported
480
  /// (or if it has been \#included and we've encountered a \#pragma once).
481
2
  bool hasFileBeenImported(const FileEntry *File) {
482
2
    const HeaderFileInfo *FI = getExistingFileInfo(File);
483
2
    return FI && FI->isImport;
484
2
  }
485
486
  /// This method returns a HeaderMap for the specified
487
  /// FileEntry, uniquing them through the 'HeaderMaps' datastructure.
488
  const HeaderMap *CreateHeaderMap(const FileEntry *FE);
489
490
  /// Get filenames for all registered header maps.
491
  void getHeaderMapFileNames(SmallVectorImpl<std::string> &Names) const;
492
493
  /// Retrieve the name of the cached module file that should be used
494
  /// to load the given module.
495
  ///
496
  /// \param Module The module whose module file name will be returned.
497
  ///
498
  /// \returns The name of the module file that corresponds to this module,
499
  /// or an empty string if this module does not correspond to any module file.
500
  std::string getCachedModuleFileName(Module *Module);
501
502
  /// Retrieve the name of the prebuilt module file that should be used
503
  /// to load a module with the given name.
504
  ///
505
  /// \param ModuleName The module whose module file name will be returned.
506
  ///
507
  /// \param FileMapOnly If true, then only look in the explicit module name
508
  //  to file name map and skip the directory search.
509
  ///
510
  /// \returns The name of the module file that corresponds to this module,
511
  /// or an empty string if this module does not correspond to any module file.
512
  std::string getPrebuiltModuleFileName(StringRef ModuleName,
513
                                        bool FileMapOnly = false);
514
515
  /// Retrieve the name of the (to-be-)cached module file that should
516
  /// be used to load a module with the given name.
517
  ///
518
  /// \param ModuleName The module whose module file name will be returned.
519
  ///
520
  /// \param ModuleMapPath A path that when combined with \c ModuleName
521
  /// uniquely identifies this module. See Module::ModuleMap.
522
  ///
523
  /// \returns The name of the module file that corresponds to this module,
524
  /// or an empty string if this module does not correspond to any module file.
525
  std::string getCachedModuleFileName(StringRef ModuleName,
526
                                      StringRef ModuleMapPath);
527
528
  /// Lookup a module Search for a module with the given name.
529
  ///
530
  /// \param ModuleName The name of the module we're looking for.
531
  ///
532
  /// \param AllowSearch Whether we are allowed to search in the various
533
  /// search directories to produce a module definition. If not, this lookup
534
  /// will only return an already-known module.
535
  ///
536
  /// \param AllowExtraModuleMapSearch Whether we allow to search modulemaps
537
  /// in subdirectories.
538
  ///
539
  /// \returns The module with the given name.
540
  Module *lookupModule(StringRef ModuleName, bool AllowSearch = true,
541
                       bool AllowExtraModuleMapSearch = false);
542
543
  /// Try to find a module map file in the given directory, returning
544
  /// \c nullptr if none is found.
545
  const FileEntry *lookupModuleMapFile(const DirectoryEntry *Dir,
546
                                       bool IsFramework);
547
548
  /// Determine whether there is a module map that may map the header
549
  /// with the given file name to a (sub)module.
550
  /// Always returns false if modules are disabled.
551
  ///
552
  /// \param Filename The name of the file.
553
  ///
554
  /// \param Root The "root" directory, at which we should stop looking for
555
  /// module maps.
556
  ///
557
  /// \param IsSystem Whether the directories we're looking at are system
558
  /// header directories.
559
  bool hasModuleMap(StringRef Filename, const DirectoryEntry *Root,
560
                    bool IsSystem);
561
562
  /// Retrieve the module that corresponds to the given file, if any.
563
  ///
564
  /// \param File The header that we wish to map to a module.
565
  /// \param AllowTextual Whether we want to find textual headers too.
566
  ModuleMap::KnownHeader findModuleForHeader(const FileEntry *File,
567
                                             bool AllowTextual = false) const;
568
569
  /// Retrieve all the modules corresponding to the given file.
570
  ///
571
  /// \ref findModuleForHeader should typically be used instead of this.
572
  ArrayRef<ModuleMap::KnownHeader>
573
  findAllModulesForHeader(const FileEntry *File) const;
574
575
  /// Read the contents of the given module map file.
576
  ///
577
  /// \param File The module map file.
578
  /// \param IsSystem Whether this file is in a system header directory.
579
  /// \param ID If the module map file is already mapped (perhaps as part of
580
  ///        processing a preprocessed module), the ID of the file.
581
  /// \param Offset [inout] An offset within ID to start parsing. On exit,
582
  ///        filled by the end of the parsed contents (either EOF or the
583
  ///        location of an end-of-module-map pragma).
584
  /// \param OriginalModuleMapFile The original path to the module map file,
585
  ///        used to resolve paths within the module (this is required when
586
  ///        building the module from preprocessed source).
587
  /// \returns true if an error occurred, false otherwise.
588
  bool loadModuleMapFile(const FileEntry *File, bool IsSystem,
589
                         FileID ID = FileID(), unsigned *Offset = nullptr,
590
                         StringRef OriginalModuleMapFile = StringRef());
591
592
  /// Collect the set of all known, top-level modules.
593
  ///
594
  /// \param Modules Will be filled with the set of known, top-level modules.
595
  void collectAllModules(SmallVectorImpl<Module *> &Modules);
596
597
  /// Load all known, top-level system modules.
598
  void loadTopLevelSystemModules();
599
600
private:
601
  /// Lookup a module with the given module name and search-name.
602
  ///
603
  /// \param ModuleName The name of the module we're looking for.
604
  ///
605
  /// \param SearchName The "search-name" to derive filesystem paths from
606
  /// when looking for the module map; this is usually equal to ModuleName,
607
  /// but for compatibility with some buggy frameworks, additional attempts
608
  /// may be made to find the module under a related-but-different search-name.
609
  ///
610
  /// \param AllowExtraModuleMapSearch Whether we allow to search modulemaps
611
  /// in subdirectories.
612
  ///
613
  /// \returns The module named ModuleName.
614
  Module *lookupModule(StringRef ModuleName, StringRef SearchName,
615
                       bool AllowExtraModuleMapSearch = false);
616
617
  /// Retrieve a module with the given name, which may be part of the
618
  /// given framework.
619
  ///
620
  /// \param Name The name of the module to retrieve.
621
  ///
622
  /// \param Dir The framework directory (e.g., ModuleName.framework).
623
  ///
624
  /// \param IsSystem Whether the framework directory is part of the system
625
  /// frameworks.
626
  ///
627
  /// \returns The module, if found; otherwise, null.
628
  Module *loadFrameworkModule(StringRef Name,
629
                              const DirectoryEntry *Dir,
630
                              bool IsSystem);
631
632
  /// Load all of the module maps within the immediate subdirectories
633
  /// of the given search directory.
634
  void loadSubdirectoryModuleMaps(DirectoryLookup &SearchDir);
635
636
  /// Find and suggest a usable module for the given file.
637
  ///
638
  /// \return \c true if the file can be used, \c false if we are not permitted to
639
  ///         find this file due to requirements from \p RequestingModule.
640
  bool findUsableModuleForHeader(const FileEntry *File,
641
                                 const DirectoryEntry *Root,
642
                                 Module *RequestingModule,
643
                                 ModuleMap::KnownHeader *SuggestedModule,
644
                                 bool IsSystemHeaderDir);
645
646
  /// Find and suggest a usable module for the given file, which is part of
647
  /// the specified framework.
648
  ///
649
  /// \return \c true if the file can be used, \c false if we are not permitted to
650
  ///         find this file due to requirements from \p RequestingModule.
651
  bool findUsableModuleForFrameworkHeader(
652
      const FileEntry *File, StringRef FrameworkName, Module *RequestingModule,
653
      ModuleMap::KnownHeader *SuggestedModule, bool IsSystemFramework);
654
655
  /// Look up the file with the specified name and determine its owning
656
  /// module.
657
  Optional<FileEntryRef>
658
  getFileAndSuggestModule(StringRef FileName, SourceLocation IncludeLoc,
659
                          const DirectoryEntry *Dir, bool IsSystemHeaderDir,
660
                          Module *RequestingModule,
661
                          ModuleMap::KnownHeader *SuggestedModule);
662
663
public:
664
  /// Retrieve the module map.
665
4.96M
  ModuleMap &getModuleMap() { return ModMap; }
666
667
  /// Retrieve the module map.
668
131k
  const ModuleMap &getModuleMap() const { return ModMap; }
669
670
5.95k
  unsigned header_file_size() const { return FileInfo.size(); }
671
672
  /// Return the HeaderFileInfo structure for the specified FileEntry,
673
  /// in preparation for updating it in some way.
674
  HeaderFileInfo &getFileInfo(const FileEntry *FE);
675
676
  /// Return the HeaderFileInfo structure for the specified FileEntry,
677
  /// if it has ever been filled in.
678
  /// \param WantExternal Whether the caller wants purely-external header file
679
  ///        info (where \p External is true).
680
  const HeaderFileInfo *getExistingFileInfo(const FileEntry *FE,
681
                                            bool WantExternal = true) const;
682
683
  // Used by external tools
684
  using search_dir_iterator = std::vector<DirectoryLookup>::const_iterator;
685
686
1
  search_dir_iterator search_dir_begin() const { return SearchDirs.begin(); }
687
1
  search_dir_iterator search_dir_end() const { return SearchDirs.end(); }
688
  unsigned search_dir_size() const { return SearchDirs.size(); }
689
690
5
  search_dir_iterator quoted_dir_begin() const {
691
5
    return SearchDirs.begin();
692
5
  }
693
694
5
  search_dir_iterator quoted_dir_end() const {
695
5
    return SearchDirs.begin() + AngledDirIdx;
696
5
  }
697
698
11
  search_dir_iterator angled_dir_begin() const {
699
11
    return SearchDirs.begin() + AngledDirIdx;
700
11
  }
701
702
11
  search_dir_iterator angled_dir_end() const {
703
11
    return SearchDirs.begin() + SystemDirIdx;
704
11
  }
705
706
11
  search_dir_iterator system_dir_begin() const {
707
11
    return SearchDirs.begin() + SystemDirIdx;
708
11
  }
709
710
11
  search_dir_iterator system_dir_end() const { return SearchDirs.end(); }
711
712
  /// Retrieve a uniqued framework name.
713
  StringRef getUniqueFrameworkName(StringRef Framework);
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 IsSystem If non-null, filled in to indicate whether the suggested
723
  ///        path is relative to a system header directory.
724
  std::string suggestPathToFileForDiagnostics(const FileEntry *File,
725
                                              llvm::StringRef MainFile,
726
                                              bool *IsSystem = nullptr);
727
728
  /// Suggest a path by which the specified file could be found, for use in
729
  /// diagnostics to suggest a #include. Returned path will only contain forward
730
  /// slashes as separators. MainFile is the absolute path of the file that we
731
  /// are generating the diagnostics for. It will try to shorten the path using
732
  /// MainFile location, if none of the include search directories were prefix
733
  /// of File.
734
  ///
735
  /// \param WorkingDir If non-empty, this will be prepended to search directory
736
  /// paths that are relative.
737
  std::string suggestPathToFileForDiagnostics(llvm::StringRef File,
738
                                              llvm::StringRef WorkingDir,
739
                                              llvm::StringRef MainFile,
740
                                              bool *IsSystem = nullptr);
741
742
  void PrintStats();
743
744
  size_t getTotalMemory() const;
745
746
private:
747
  /// Describes what happened when we tried to load a module map file.
748
  enum LoadModuleMapResult {
749
    /// The module map file had already been loaded.
750
    LMM_AlreadyLoaded,
751
752
    /// The module map file was loaded by this invocation.
753
    LMM_NewlyLoaded,
754
755
    /// There is was directory with the given name.
756
    LMM_NoDirectory,
757
758
    /// There was either no module map file or the module map file was
759
    /// invalid.
760
    LMM_InvalidModuleMap
761
  };
762
763
  LoadModuleMapResult loadModuleMapFileImpl(const FileEntry *File,
764
                                            bool IsSystem,
765
                                            const DirectoryEntry *Dir,
766
                                            FileID ID = FileID(),
767
                                            unsigned *Offset = nullptr);
768
769
  /// Try to load the module map file in the given directory.
770
  ///
771
  /// \param DirName The name of the directory where we will look for a module
772
  /// map file.
773
  /// \param IsSystem Whether this is a system header directory.
774
  /// \param IsFramework Whether this is a framework directory.
775
  ///
776
  /// \returns The result of attempting to load the module map file from the
777
  /// named directory.
778
  LoadModuleMapResult loadModuleMapFile(StringRef DirName, bool IsSystem,
779
                                        bool IsFramework);
780
781
  /// Try to load the module map file in the given directory.
782
  ///
783
  /// \param Dir The directory where we will look for a module map file.
784
  /// \param IsSystem Whether this is a system header directory.
785
  /// \param IsFramework Whether this is a framework directory.
786
  ///
787
  /// \returns The result of attempting to load the module map file from the
788
  /// named directory.
789
  LoadModuleMapResult loadModuleMapFile(const DirectoryEntry *Dir,
790
                                        bool IsSystem, bool IsFramework);
791
};
792
793
} // namespace clang
794
795
#endif // LLVM_CLANG_LEX_HEADERSEARCH_H