1//===- ModuleMap.h - Describe the layout of modules -------------*- 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 ModuleMap interface, which describes the layout of a
10// module as it relates to headers.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_LEX_MODULEMAP_H
15#define LLVM_CLANG_LEX_MODULEMAP_H
16
17#include "clang/Basic/IdentifierTable.h"
18#include "clang/Basic/LangOptions.h"
19#include "clang/Basic/Module.h"
20#include "clang/Basic/SourceLocation.h"
21#include "llvm/ADT/ArrayRef.h"
22#include "llvm/ADT/DenseMap.h"
23#include "llvm/ADT/DenseSet.h"
24#include "llvm/ADT/PointerIntPair.h"
25#include "llvm/ADT/SmallVector.h"
26#include "llvm/ADT/StringMap.h"
27#include "llvm/ADT/StringRef.h"
28#include "llvm/ADT/StringSet.h"
29#include "llvm/ADT/TinyPtrVector.h"
30#include "llvm/ADT/Twine.h"
31#include <ctime>
32#include <memory>
33#include <optional>
34#include <string>
35#include <utility>
36
37namespace clang {
38
39class DiagnosticsEngine;
40class DirectoryEntry;
41class FileEntry;
42class FileManager;
43class HeaderSearch;
44class SourceManager;
45
46/// A mechanism to observe the actions of the module map parser as it
47/// reads module map files.
48class ModuleMapCallbacks {
49 virtual void anchor();
50
51public:
52 virtual ~ModuleMapCallbacks() = default;
53
54 /// Called when a module map file has been read.
55 ///
56 /// \param FileStart A SourceLocation referring to the start of the file's
57 /// contents.
58 /// \param File The file itself.
59 /// \param IsSystem Whether this is a module map from a system include path.
60 virtual void moduleMapFileRead(SourceLocation FileStart, FileEntryRef File,
61 bool IsSystem) {}
62
63 /// Called when a header is added during module map parsing.
64 ///
65 /// \param Filename The header file itself.
66 virtual void moduleMapAddHeader(StringRef Filename) {}
67
68 /// Called when an umbrella header is added during module map parsing.
69 ///
70 /// \param Header The umbrella header to collect.
71 virtual void moduleMapAddUmbrellaHeader(FileEntryRef Header) {}
72};
73
74class ModuleMap {
75 SourceManager &SourceMgr;
76 DiagnosticsEngine &Diags;
77 const LangOptions &LangOpts;
78 const TargetInfo *Target;
79 HeaderSearch &HeaderInfo;
80
81 llvm::SmallVector<std::unique_ptr<ModuleMapCallbacks>, 1> Callbacks;
82
83 /// The directory used for Clang-supplied, builtin include headers,
84 /// such as "stdint.h".
85 OptionalDirectoryEntryRef BuiltinIncludeDir;
86
87 /// Language options used to parse the module map itself.
88 ///
89 /// These are always simple C language options.
90 LangOptions MMapLangOpts;
91
92 /// The module that the main source file is associated with (the module
93 /// named LangOpts::CurrentModule, if we've loaded it).
94 Module *SourceModule = nullptr;
95
96 /// Submodules of the current module that have not yet been attached to it.
97 /// (Ownership is transferred if/when we create an enclosing module.)
98 llvm::SmallVector<std::unique_ptr<Module>, 8> PendingSubmodules;
99
100 /// The top-level modules that are known.
101 llvm::StringMap<Module *> Modules;
102
103 /// Module loading cache that includes submodules, indexed by IdentifierInfo.
104 /// nullptr is stored for modules that are known to fail to load.
105 llvm::DenseMap<const IdentifierInfo *, Module *> CachedModuleLoads;
106
107 /// Shadow modules created while building this module map.
108 llvm::SmallVector<Module*, 2> ShadowModules;
109
110 /// The number of modules we have created in total.
111 unsigned NumCreatedModules = 0;
112
113 /// In case a module has a export_as entry, it might have a pending link
114 /// name to be determined if that module is imported.
115 llvm::StringMap<llvm::StringSet<>> PendingLinkAsModule;
116
117public:
118 /// Use PendingLinkAsModule information to mark top level link names that
119 /// are going to be replaced by export_as aliases.
120 void resolveLinkAsDependencies(Module *Mod);
121
122 /// Make module to use export_as as the link dependency name if enough
123 /// information is available or add it to a pending list otherwise.
124 void addLinkAsDependency(Module *Mod);
125
126 /// Flags describing the role of a module header.
127 enum ModuleHeaderRole {
128 /// This header is normally included in the module.
129 NormalHeader = 0x0,
130
131 /// This header is included but private.
132 PrivateHeader = 0x1,
133
134 /// This header is part of the module (for layering purposes) but
135 /// should be textually included.
136 TextualHeader = 0x2,
137
138 /// This header is explicitly excluded from the module.
139 ExcludedHeader = 0x4,
140
141 // Caution: Adding an enumerator needs other changes.
142 // Adjust the number of bits for KnownHeader::Storage.
143 // Adjust the HeaderFileInfoTrait::ReadData streaming.
144 // Adjust the HeaderFileInfoTrait::EmitData streaming.
145 // Adjust ModuleMap::addHeader.
146 };
147
148 /// Convert a header kind to a role. Requires Kind to not be HK_Excluded.
149 static ModuleHeaderRole headerKindToRole(Module::HeaderKind Kind);
150
151 /// Convert a header role to a kind.
152 static Module::HeaderKind headerRoleToKind(ModuleHeaderRole Role);
153
154 /// Check if the header with the given role is a modular one.
155 static bool isModular(ModuleHeaderRole Role);
156
157 /// A header that is known to reside within a given module,
158 /// whether it was included or excluded.
159 class KnownHeader {
160 llvm::PointerIntPair<Module *, 3, ModuleHeaderRole> Storage;
161
162 public:
163 KnownHeader() : Storage(nullptr, NormalHeader) {}
164 KnownHeader(Module *M, ModuleHeaderRole Role) : Storage(M, Role) {}
165
166 friend bool operator==(const KnownHeader &A, const KnownHeader &B) {
167 return A.Storage == B.Storage;
168 }
169 friend bool operator!=(const KnownHeader &A, const KnownHeader &B) {
170 return A.Storage != B.Storage;
171 }
172
173 /// Retrieve the module the header is stored in.
174 Module *getModule() const { return Storage.getPointer(); }
175
176 /// The role of this header within the module.
177 ModuleHeaderRole getRole() const { return Storage.getInt(); }
178
179 /// Whether this header is available in the module.
180 bool isAvailable() const {
181 return getRole() != ExcludedHeader && getModule()->isAvailable();
182 }
183
184 /// Whether this header is accessible from the specified module.
185 bool isAccessibleFrom(Module *M) const {
186 return !(getRole() & PrivateHeader) ||
187 (M && M->getTopLevelModule() == getModule()->getTopLevelModule());
188 }
189
190 // Whether this known header is valid (i.e., it has an
191 // associated module).
192 explicit operator bool() const {
193 return Storage.getPointer() != nullptr;
194 }
195 };
196
197 using AdditionalModMapsSet = llvm::DenseSet<FileEntryRef>;
198
199private:
200 friend class ModuleMapParser;
201
202 using HeadersMap = llvm::DenseMap<FileEntryRef, SmallVector<KnownHeader, 1>>;
203
204 /// Mapping from each header to the module that owns the contents of
205 /// that header.
206 HeadersMap Headers;
207
208 /// Map from file sizes to modules with lazy header directives of that size.
209 mutable llvm::DenseMap<off_t, llvm::TinyPtrVector<Module*>> LazyHeadersBySize;
210
211 /// Map from mtimes to modules with lazy header directives with those mtimes.
212 mutable llvm::DenseMap<time_t, llvm::TinyPtrVector<Module*>>
213 LazyHeadersByModTime;
214
215 /// Mapping from directories with umbrella headers to the module
216 /// that is generated from the umbrella header.
217 ///
218 /// This mapping is used to map headers that haven't explicitly been named
219 /// in the module map over to the module that includes them via its umbrella
220 /// header.
221 llvm::DenseMap<const DirectoryEntry *, Module *> UmbrellaDirs;
222
223 /// A generation counter that is used to test whether modules of the
224 /// same name may shadow or are illegal redefinitions.
225 ///
226 /// Modules from earlier scopes may shadow modules from later ones.
227 /// Modules from the same scope may not have the same name.
228 unsigned CurrentModuleScopeID = 0;
229
230 llvm::DenseMap<Module *, unsigned> ModuleScopeIDs;
231
232 /// The set of attributes that can be attached to a module.
233 struct Attributes {
234 /// Whether this is a system module.
235 LLVM_PREFERRED_TYPE(bool)
236 unsigned IsSystem : 1;
237
238 /// Whether this is an extern "C" module.
239 LLVM_PREFERRED_TYPE(bool)
240 unsigned IsExternC : 1;
241
242 /// Whether this is an exhaustive set of configuration macros.
243 LLVM_PREFERRED_TYPE(bool)
244 unsigned IsExhaustive : 1;
245
246 /// Whether files in this module can only include non-modular headers
247 /// and headers from used modules.
248 LLVM_PREFERRED_TYPE(bool)
249 unsigned NoUndeclaredIncludes : 1;
250
251 Attributes()
252 : IsSystem(false), IsExternC(false), IsExhaustive(false),
253 NoUndeclaredIncludes(false) {}
254 };
255
256 /// A directory for which framework modules can be inferred.
257 struct InferredDirectory {
258 /// Whether to infer modules from this directory.
259 LLVM_PREFERRED_TYPE(bool)
260 unsigned InferModules : 1;
261
262 /// The attributes to use for inferred modules.
263 Attributes Attrs;
264
265 /// If \c InferModules is non-zero, the module map file that allowed
266 /// inferred modules. Otherwise, nullopt.
267 OptionalFileEntryRef ModuleMapFile;
268
269 /// The names of modules that cannot be inferred within this
270 /// directory.
271 SmallVector<std::string, 2> ExcludedModules;
272
273 InferredDirectory() : InferModules(false) {}
274 };
275
276 /// A mapping from directories to information about inferring
277 /// framework modules from within those directories.
278 llvm::DenseMap<const DirectoryEntry *, InferredDirectory> InferredDirectories;
279
280 /// A mapping from an inferred module to the module map that allowed the
281 /// inference.
282 // FIXME: Consider making the values non-optional.
283 llvm::DenseMap<const Module *, OptionalFileEntryRef> InferredModuleAllowedBy;
284
285 llvm::DenseMap<const Module *, AdditionalModMapsSet> AdditionalModMaps;
286
287 /// Describes whether we haved parsed a particular file as a module
288 /// map.
289 llvm::DenseMap<const FileEntry *, bool> ParsedModuleMap;
290
291 /// Resolve the given export declaration into an actual export
292 /// declaration.
293 ///
294 /// \param Mod The module in which we're resolving the export declaration.
295 ///
296 /// \param Unresolved The export declaration to resolve.
297 ///
298 /// \param Complain Whether this routine should complain about unresolvable
299 /// exports.
300 ///
301 /// \returns The resolved export declaration, which will have a NULL pointer
302 /// if the export could not be resolved.
303 Module::ExportDecl
304 resolveExport(Module *Mod, const Module::UnresolvedExportDecl &Unresolved,
305 bool Complain) const;
306
307 /// Resolve the given module id to an actual module.
308 ///
309 /// \param Id The module-id to resolve.
310 ///
311 /// \param Mod The module in which we're resolving the module-id.
312 ///
313 /// \param Complain Whether this routine should complain about unresolvable
314 /// module-ids.
315 ///
316 /// \returns The resolved module, or null if the module-id could not be
317 /// resolved.
318 Module *resolveModuleId(const ModuleId &Id, Module *Mod, bool Complain) const;
319
320 /// Add an unresolved header to a module.
321 ///
322 /// \param Mod The module in which we're adding the unresolved header
323 /// directive.
324 /// \param Header The unresolved header directive.
325 /// \param NeedsFramework If Mod is not a framework but a missing header would
326 /// be found in case Mod was, set it to true. False otherwise.
327 void addUnresolvedHeader(Module *Mod,
328 Module::UnresolvedHeaderDirective Header,
329 bool &NeedsFramework);
330
331 /// Look up the given header directive to find an actual header file.
332 ///
333 /// \param M The module in which we're resolving the header directive.
334 /// \param Header The header directive to resolve.
335 /// \param RelativePathName Filled in with the relative path name from the
336 /// module to the resolved header.
337 /// \param NeedsFramework If M is not a framework but a missing header would
338 /// be found in case M was, set it to true. False otherwise.
339 /// \return The resolved file, if any.
340 OptionalFileEntryRef
341 findHeader(Module *M, const Module::UnresolvedHeaderDirective &Header,
342 SmallVectorImpl<char> &RelativePathName, bool &NeedsFramework);
343
344 /// Resolve the given header directive.
345 ///
346 /// \param M The module in which we're resolving the header directive.
347 /// \param Header The header directive to resolve.
348 /// \param NeedsFramework If M is not a framework but a missing header would
349 /// be found in case M was, set it to true. False otherwise.
350 void resolveHeader(Module *M, const Module::UnresolvedHeaderDirective &Header,
351 bool &NeedsFramework);
352
353 /// Attempt to resolve the specified header directive as naming a builtin
354 /// header.
355 /// \return \c true if a corresponding builtin header was found.
356 bool resolveAsBuiltinHeader(Module *M,
357 const Module::UnresolvedHeaderDirective &Header);
358
359 /// Looks up the modules that \p File corresponds to.
360 ///
361 /// If \p File represents a builtin header within Clang's builtin include
362 /// directory, this also loads all of the module maps to see if it will get
363 /// associated with a specific module (e.g. in /usr/include).
364 HeadersMap::iterator findKnownHeader(FileEntryRef File);
365
366 /// Searches for a module whose umbrella directory contains \p File.
367 ///
368 /// \param File The header to search for.
369 ///
370 /// \param IntermediateDirs On success, contains the set of directories
371 /// searched before finding \p File.
372 KnownHeader findHeaderInUmbrellaDirs(
373 FileEntryRef File, SmallVectorImpl<DirectoryEntryRef> &IntermediateDirs);
374
375 /// Given that \p File is not in the Headers map, look it up within
376 /// umbrella directories and find or create a module for it.
377 KnownHeader findOrCreateModuleForHeaderInUmbrellaDir(FileEntryRef File);
378
379 /// A convenience method to determine if \p File is (possibly nested)
380 /// in an umbrella directory.
381 bool isHeaderInUmbrellaDirs(FileEntryRef File) {
382 SmallVector<DirectoryEntryRef, 2> IntermediateDirs;
383 return static_cast<bool>(findHeaderInUmbrellaDirs(File, IntermediateDirs));
384 }
385
386 Module *inferFrameworkModule(DirectoryEntryRef FrameworkDir, Attributes Attrs,
387 Module *Parent);
388
389public:
390 /// Construct a new module map.
391 ///
392 /// \param SourceMgr The source manager used to find module files and headers.
393 /// This source manager should be shared with the header-search mechanism,
394 /// since they will refer to the same headers.
395 ///
396 /// \param Diags A diagnostic engine used for diagnostics.
397 ///
398 /// \param LangOpts Language options for this translation unit.
399 ///
400 /// \param Target The target for this translation unit.
401 ModuleMap(SourceManager &SourceMgr, DiagnosticsEngine &Diags,
402 const LangOptions &LangOpts, const TargetInfo *Target,
403 HeaderSearch &HeaderInfo);
404
405 /// Destroy the module map.
406 ~ModuleMap();
407
408 /// Set the target information.
409 void setTarget(const TargetInfo &Target);
410
411 /// Set the directory that contains Clang-supplied include files, such as our
412 /// stdarg.h or tgmath.h.
413 void setBuiltinIncludeDir(DirectoryEntryRef Dir) { BuiltinIncludeDir = Dir; }
414
415 /// Get the directory that contains Clang-supplied include files.
416 OptionalDirectoryEntryRef getBuiltinDir() const { return BuiltinIncludeDir; }
417
418 /// Is this a compiler builtin header?
419 bool isBuiltinHeader(FileEntryRef File);
420
421 bool shouldImportRelativeToBuiltinIncludeDir(StringRef FileName,
422 Module *Module) const;
423
424 /// Add a module map callback.
425 void addModuleMapCallbacks(std::unique_ptr<ModuleMapCallbacks> Callback) {
426 Callbacks.push_back(Elt: std::move(Callback));
427 }
428
429 /// Retrieve the module that owns the given header file, if any. Note that
430 /// this does not implicitly load module maps, except for builtin headers,
431 /// and does not consult the external source. (Those checks are the
432 /// responsibility of \ref HeaderSearch.)
433 ///
434 /// \param File The header file that is likely to be included.
435 ///
436 /// \param AllowTextual If \c true and \p File is a textual header, return
437 /// its owning module. Otherwise, no KnownHeader will be returned if the
438 /// file is only known as a textual header.
439 ///
440 /// \returns The module KnownHeader, which provides the module that owns the
441 /// given header file. The KnownHeader is default constructed to indicate
442 /// that no module owns this header file.
443 KnownHeader findModuleForHeader(FileEntryRef File, bool AllowTextual = false,
444 bool AllowExcluded = false);
445
446 /// Retrieve all the modules that contain the given header file. Note that
447 /// this does not implicitly load module maps, except for builtin headers,
448 /// and does not consult the external source. (Those checks are the
449 /// responsibility of \ref HeaderSearch.)
450 ///
451 /// Typically, \ref findModuleForHeader should be used instead, as it picks
452 /// the preferred module for the header.
453 ArrayRef<KnownHeader> findAllModulesForHeader(FileEntryRef File);
454
455 /// Like \ref findAllModulesForHeader, but do not attempt to infer module
456 /// ownership from umbrella headers if we've not already done so.
457 ArrayRef<KnownHeader> findResolvedModulesForHeader(FileEntryRef File) const;
458
459 /// Resolve all lazy header directives for the specified file.
460 ///
461 /// This ensures that the HeaderFileInfo on HeaderSearch is up to date. This
462 /// is effectively internal, but is exposed so HeaderSearch can call it.
463 void resolveHeaderDirectives(const FileEntry *File) const;
464
465 /// Resolve lazy header directives for the specified module. If File is
466 /// provided, only headers with same size and modtime are resolved. If File
467 /// is not set, all headers are resolved.
468 void resolveHeaderDirectives(Module *Mod,
469 std::optional<const FileEntry *> File) const;
470
471 /// Reports errors if a module must not include a specific file.
472 ///
473 /// \param RequestingModule The module including a file.
474 ///
475 /// \param RequestingModuleIsModuleInterface \c true if the inclusion is in
476 /// the interface of RequestingModule, \c false if it's in the
477 /// implementation of RequestingModule. Value is ignored and
478 /// meaningless if RequestingModule is nullptr.
479 ///
480 /// \param FilenameLoc The location of the inclusion's filename.
481 ///
482 /// \param Filename The included filename as written.
483 ///
484 /// \param File The included file.
485 void diagnoseHeaderInclusion(Module *RequestingModule,
486 bool RequestingModuleIsModuleInterface,
487 SourceLocation FilenameLoc, StringRef Filename,
488 FileEntryRef File);
489
490 /// Determine whether the given header is part of a module
491 /// marked 'unavailable'.
492 bool isHeaderInUnavailableModule(FileEntryRef Header) const;
493
494 /// Determine whether the given header is unavailable as part
495 /// of the specified module.
496 bool isHeaderUnavailableInModule(FileEntryRef Header,
497 const Module *RequestingModule) const;
498
499 /// Retrieve a module with the given name.
500 ///
501 /// \param Name The name of the module to look up.
502 ///
503 /// \returns The named module, if known; otherwise, returns null.
504 Module *findModule(StringRef Name) const;
505
506 /// Retrieve a module with the given name using lexical name lookup,
507 /// starting at the given context.
508 ///
509 /// \param Name The name of the module to look up.
510 ///
511 /// \param Context The module context, from which we will perform lexical
512 /// name lookup.
513 ///
514 /// \returns The named module, if known; otherwise, returns null.
515 Module *lookupModuleUnqualified(StringRef Name, Module *Context) const;
516
517 /// Retrieve a module with the given name within the given context,
518 /// using direct (qualified) name lookup.
519 ///
520 /// \param Name The name of the module to look up.
521 ///
522 /// \param Context The module for which we will look for a submodule. If
523 /// null, we will look for a top-level module.
524 ///
525 /// \returns The named submodule, if known; otherwose, returns null.
526 Module *lookupModuleQualified(StringRef Name, Module *Context) const;
527
528 /// Find a new module or submodule, or create it if it does not already
529 /// exist.
530 ///
531 /// \param Name The name of the module to find or create.
532 ///
533 /// \param Parent The module that will act as the parent of this submodule,
534 /// or nullptr to indicate that this is a top-level module.
535 ///
536 /// \param IsFramework Whether this is a framework module.
537 ///
538 /// \param IsExplicit Whether this is an explicit submodule.
539 ///
540 /// \returns The found or newly-created module, along with a boolean value
541 /// that will be true if the module is newly-created.
542 std::pair<Module *, bool> findOrCreateModule(StringRef Name, Module *Parent,
543 bool IsFramework,
544 bool IsExplicit);
545
546 /// Create a global module fragment for a C++ module unit.
547 ///
548 /// We model the global module fragment as a submodule of the module
549 /// interface unit. Unfortunately, we can't create the module interface
550 /// unit's Module until later, because we don't know what it will be called
551 /// usually. See C++20 [module.unit]/7.2 for the case we could know its
552 /// parent.
553 Module *createGlobalModuleFragmentForModuleUnit(SourceLocation Loc,
554 Module *Parent = nullptr);
555 Module *createImplicitGlobalModuleFragmentForModuleUnit(SourceLocation Loc,
556 Module *Parent);
557
558 /// Create a global module fragment for a C++ module interface unit.
559 Module *createPrivateModuleFragmentForInterfaceUnit(Module *Parent,
560 SourceLocation Loc);
561
562 /// Create a new C++ module with the specified kind, and reparent any pending
563 /// global module fragment(s) to it.
564 Module *createModuleUnitWithKind(SourceLocation Loc, StringRef Name,
565 Module::ModuleKind Kind);
566
567 /// Create a new module for a C++ module interface unit.
568 /// The module must not already exist, and will be configured for the current
569 /// compilation.
570 ///
571 /// Note that this also sets the current module to the newly-created module.
572 ///
573 /// \returns The newly-created module.
574 Module *createModuleForInterfaceUnit(SourceLocation Loc, StringRef Name);
575
576 /// Create a new module for a C++ module implementation unit.
577 /// The interface module for this implementation (implicitly imported) must
578 /// exist and be loaded and present in the modules map.
579 ///
580 /// \returns The newly-created module.
581 Module *createModuleForImplementationUnit(SourceLocation Loc, StringRef Name);
582
583 /// Create a C++20 header unit.
584 Module *createHeaderUnit(SourceLocation Loc, StringRef Name,
585 Module::Header H);
586
587 /// Infer the contents of a framework module map from the given
588 /// framework directory.
589 Module *inferFrameworkModule(DirectoryEntryRef FrameworkDir, bool IsSystem,
590 Module *Parent);
591
592 /// Create a new top-level module that is shadowed by
593 /// \p ShadowingModule.
594 Module *createShadowedModule(StringRef Name, bool IsFramework,
595 Module *ShadowingModule);
596
597 /// Creates a new declaration scope for module names, allowing
598 /// previously defined modules to shadow definitions from the new scope.
599 ///
600 /// \note Module names from earlier scopes will shadow names from the new
601 /// scope, which is the opposite of how shadowing works for variables.
602 void finishModuleDeclarationScope() { CurrentModuleScopeID += 1; }
603
604 bool mayShadowNewModule(Module *ExistingModule) {
605 assert(!ExistingModule->Parent && "expected top-level module");
606 assert(ModuleScopeIDs.count(ExistingModule) && "unknown module");
607 return ModuleScopeIDs[ExistingModule] < CurrentModuleScopeID;
608 }
609
610 /// Check whether a framework module can be inferred in the given directory.
611 bool canInferFrameworkModule(const DirectoryEntry *Dir) const {
612 auto It = InferredDirectories.find(Val: Dir);
613 return It != InferredDirectories.end() && It->getSecond().InferModules;
614 }
615
616 /// Retrieve the module map file containing the definition of the given
617 /// module.
618 ///
619 /// \param Module The module whose module map file will be returned, if known.
620 ///
621 /// \returns The file entry for the module map file containing the given
622 /// module, or nullptr if the module definition was inferred.
623 OptionalFileEntryRef getContainingModuleMapFile(const Module *Module) const;
624
625 /// Get the module map file that (along with the module name) uniquely
626 /// identifies this module.
627 ///
628 /// The particular module that \c Name refers to may depend on how the module
629 /// was found in header search. However, the combination of \c Name and
630 /// this module map will be globally unique for top-level modules. In the case
631 /// of inferred modules, returns the module map that allowed the inference
632 /// (e.g. contained 'module *'). Otherwise, returns
633 /// getContainingModuleMapFile().
634 OptionalFileEntryRef getModuleMapFileForUniquing(const Module *M) const;
635
636 void setInferredModuleAllowedBy(Module *M, OptionalFileEntryRef ModMap);
637
638 /// Canonicalize \p Path in a manner suitable for a module map file. In
639 /// particular, this canonicalizes the parent directory separately from the
640 /// filename so that it does not affect header resolution relative to the
641 /// modulemap.
642 ///
643 /// \returns an error code if any filesystem operations failed. In this case
644 /// \p Path is not modified.
645 std::error_code canonicalizeModuleMapPath(SmallVectorImpl<char> &Path);
646
647 /// Get any module map files other than getModuleMapFileForUniquing(M)
648 /// that define submodules of a top-level module \p M. This is cheaper than
649 /// getting the module map file for each submodule individually, since the
650 /// expected number of results is very small.
651 AdditionalModMapsSet *getAdditionalModuleMapFiles(const Module *M) {
652 auto I = AdditionalModMaps.find(Val: M);
653 if (I == AdditionalModMaps.end())
654 return nullptr;
655 return &I->second;
656 }
657
658 void addAdditionalModuleMapFile(const Module *M, FileEntryRef ModuleMap);
659
660 /// Resolve all of the unresolved exports in the given module.
661 ///
662 /// \param Mod The module whose exports should be resolved.
663 ///
664 /// \param Complain Whether to emit diagnostics for failures.
665 ///
666 /// \returns true if any errors were encountered while resolving exports,
667 /// false otherwise.
668 bool resolveExports(Module *Mod, bool Complain);
669
670 /// Resolve all of the unresolved uses in the given module.
671 ///
672 /// \param Mod The module whose uses should be resolved.
673 ///
674 /// \param Complain Whether to emit diagnostics for failures.
675 ///
676 /// \returns true if any errors were encountered while resolving uses,
677 /// false otherwise.
678 bool resolveUses(Module *Mod, bool Complain);
679
680 /// Resolve all of the unresolved conflicts in the given module.
681 ///
682 /// \param Mod The module whose conflicts should be resolved.
683 ///
684 /// \param Complain Whether to emit diagnostics for failures.
685 ///
686 /// \returns true if any errors were encountered while resolving conflicts,
687 /// false otherwise.
688 bool resolveConflicts(Module *Mod, bool Complain);
689
690 /// Sets the umbrella header of the given module to the given header.
691 void
692 setUmbrellaHeaderAsWritten(Module *Mod, FileEntryRef UmbrellaHeader,
693 const Twine &NameAsWritten,
694 const Twine &PathRelativeToRootModuleDirectory);
695
696 /// Sets the umbrella directory of the given module to the given directory.
697 void setUmbrellaDirAsWritten(Module *Mod, DirectoryEntryRef UmbrellaDir,
698 const Twine &NameAsWritten,
699 const Twine &PathRelativeToRootModuleDirectory);
700
701 /// Adds this header to the given module.
702 /// \param Role The role of the header wrt the module.
703 void addHeader(Module *Mod, Module::Header Header,
704 ModuleHeaderRole Role, bool Imported = false);
705
706 /// Parse the given module map file, and record any modules we
707 /// encounter.
708 ///
709 /// \param File The file to be parsed.
710 ///
711 /// \param IsSystem Whether this module map file is in a system header
712 /// directory, and therefore should be considered a system module.
713 ///
714 /// \param HomeDir The directory in which relative paths within this module
715 /// map file will be resolved.
716 ///
717 /// \param ID The FileID of the file to process, if we've already entered it.
718 ///
719 /// \param Offset [inout] On input the offset at which to start parsing. On
720 /// output, the offset at which the module map terminated.
721 ///
722 /// \param ExternModuleLoc The location of the "extern module" declaration
723 /// that caused us to load this module map file, if any.
724 ///
725 /// \returns true if an error occurred, false otherwise.
726 bool parseModuleMapFile(FileEntryRef File, bool IsSystem,
727 DirectoryEntryRef HomeDir, FileID ID = FileID(),
728 unsigned *Offset = nullptr,
729 SourceLocation ExternModuleLoc = SourceLocation());
730
731 /// Dump the contents of the module map, for debugging purposes.
732 void dump();
733
734 using module_iterator = llvm::StringMap<Module *>::const_iterator;
735
736 module_iterator module_begin() const { return Modules.begin(); }
737 module_iterator module_end() const { return Modules.end(); }
738 llvm::iterator_range<module_iterator> modules() const {
739 return {module_begin(), module_end()};
740 }
741
742 /// Cache a module load. M might be nullptr.
743 void cacheModuleLoad(const IdentifierInfo &II, Module *M) {
744 CachedModuleLoads[&II] = M;
745 }
746
747 /// Return a cached module load.
748 std::optional<Module *> getCachedModuleLoad(const IdentifierInfo &II) {
749 auto I = CachedModuleLoads.find(Val: &II);
750 if (I == CachedModuleLoads.end())
751 return std::nullopt;
752 return I->second;
753 }
754};
755
756} // namespace clang
757
758#endif // LLVM_CLANG_LEX_MODULEMAP_H
759

source code of clang/include/clang/Lex/ModuleMap.h