1 //===--- Module.h - Describe a module ---------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Defines the clang::Module class, which describes a module in the
14 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_CLANG_BASIC_MODULE_H
16 #define LLVM_CLANG_BASIC_MODULE_H
18 #include "clang/Basic/FileManager.h"
19 #include "clang/Basic/SourceLocation.h"
20 #include "llvm/ADT/ArrayRef.h"
21 #include "llvm/ADT/DenseSet.h"
22 #include "llvm/ADT/PointerIntPair.h"
23 #include "llvm/ADT/PointerUnion.h"
24 #include "llvm/ADT/SetVector.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/ADT/STLExtras.h"
27 #include "llvm/ADT/StringMap.h"
28 #include "llvm/ADT/StringRef.h"
43 /// \brief Describes the name of a module.
44 typedef SmallVector<std::pair<std::string, SourceLocation>, 2> ModuleId;
46 /// \brief Describes a module or submodule.
49 /// \brief The name of this module.
52 /// \brief The location of the module definition.
53 SourceLocation DefinitionLoc;
55 /// \brief The parent of this module. This will be NULL for the top-level
59 /// \brief The build directory of this module. This is the directory in
60 /// which the module is notionally built, and relative to which its headers
62 const DirectoryEntry *Directory;
64 /// \brief The umbrella header or directory.
65 llvm::PointerUnion<const DirectoryEntry *, const FileEntry *> Umbrella;
67 /// \brief The module signature.
70 /// \brief The name of the umbrella entry, as written in the module map.
71 std::string UmbrellaAsWritten;
74 /// \brief The submodules of this module, indexed by name.
75 std::vector<Module *> SubModules;
77 /// \brief A mapping from the submodule name to the index into the
78 /// \c SubModules vector at which that submodule resides.
79 llvm::StringMap<unsigned> SubModuleIndex;
81 /// \brief The AST file if this is a top-level module which has a
82 /// corresponding serialized AST file, or null otherwise.
83 const FileEntry *ASTFile;
85 /// \brief The top-level headers associated with this module.
86 llvm::SmallSetVector<const FileEntry *, 2> TopHeaders;
88 /// \brief top-level header filenames that aren't resolved to FileEntries yet.
89 std::vector<std::string> TopHeaderNames;
91 /// \brief Cache of modules visible to lookup in this module.
92 mutable llvm::DenseSet<const Module*> VisibleModulesCache;
94 /// The ID used when referencing this module within a VisibleModuleSet.
95 unsigned VisibilityID;
105 static const int NumHeaderKinds = HK_Excluded + 1;
107 /// \brief Information about a header directive as found in the module map
110 std::string NameAsWritten;
111 const FileEntry *Entry;
113 explicit operator bool() { return Entry; }
116 /// \brief Information about a directory name as found in the module map
118 struct DirectoryName {
119 std::string NameAsWritten;
120 const DirectoryEntry *Entry;
122 explicit operator bool() { return Entry; }
125 /// \brief The headers that are part of this module.
126 SmallVector<Header, 2> Headers[5];
128 /// \brief Stored information about a header directive that was found in the
129 /// module map file but has not been resolved to a file.
130 struct UnresolvedHeaderDirective {
131 SourceLocation FileNameLoc;
132 std::string FileName;
136 /// \brief Headers that are mentioned in the module map file but could not be
137 /// found on the file system.
138 SmallVector<UnresolvedHeaderDirective, 1> MissingHeaders;
140 /// \brief An individual requirement: a feature name and a flag indicating
141 /// the required state of that feature.
142 typedef std::pair<std::string, bool> Requirement;
144 /// \brief The set of language features required to use this module.
146 /// If any of these requirements are not available, the \c IsAvailable bit
147 /// will be false to indicate that this (sub)module is not available.
148 SmallVector<Requirement, 2> Requirements;
150 /// \brief Whether this module is missing a feature from \c Requirements.
151 unsigned IsMissingRequirement : 1;
153 /// \brief Whether we tried and failed to load a module file for this module.
154 unsigned HasIncompatibleModuleFile : 1;
156 /// \brief Whether this module is available in the current translation unit.
158 /// If the module is missing headers or does not meet all requirements then
159 /// this bit will be 0.
160 unsigned IsAvailable : 1;
162 /// \brief Whether this module was loaded from a module file.
163 unsigned IsFromModuleFile : 1;
165 /// \brief Whether this is a framework module.
166 unsigned IsFramework : 1;
168 /// \brief Whether this is an explicit submodule.
169 unsigned IsExplicit : 1;
171 /// \brief Whether this is a "system" module (which assumes that all
172 /// headers in it are system headers).
173 unsigned IsSystem : 1;
175 /// \brief Whether this is an 'extern "C"' module (which implicitly puts all
176 /// headers in it within an 'extern "C"' block, and allows the module to be
177 /// imported within such a block).
178 unsigned IsExternC : 1;
180 /// \brief Whether this is an inferred submodule (module * { ... }).
181 unsigned IsInferred : 1;
183 /// \brief Whether we should infer submodules for this module based on
186 /// Submodules can only be inferred for modules with an umbrella header.
187 unsigned InferSubmodules : 1;
189 /// \brief Whether, when inferring submodules, the inferred submodules
190 /// should be explicit.
191 unsigned InferExplicitSubmodules : 1;
193 /// \brief Whether, when inferring submodules, the inferr submodules should
194 /// export all modules they import (e.g., the equivalent of "export *").
195 unsigned InferExportWildcard : 1;
197 /// \brief Whether the set of configuration macros is exhaustive.
199 /// When the set of configuration macros is exhaustive, meaning
200 /// that no identifier not in this list should affect how the module is
202 unsigned ConfigMacrosExhaustive : 1;
204 /// \brief Describes the visibility of the various names within a
205 /// particular module.
206 enum NameVisibilityKind {
207 /// \brief All of the names in this module are hidden.
209 /// \brief All of the names in this module are visible.
213 /// \brief The visibility of names within this particular module.
214 NameVisibilityKind NameVisibility;
216 /// \brief The location of the inferred submodule.
217 SourceLocation InferredSubmoduleLoc;
219 /// \brief The set of modules imported by this module, and on which this
221 llvm::SmallSetVector<Module *, 2> Imports;
223 /// \brief Describes an exported module.
225 /// The pointer is the module being re-exported, while the bit will be true
226 /// to indicate that this is a wildcard export.
227 typedef llvm::PointerIntPair<Module *, 1, bool> ExportDecl;
229 /// \brief The set of export declarations.
230 SmallVector<ExportDecl, 2> Exports;
232 /// \brief Describes an exported module that has not yet been resolved
233 /// (perhaps because the module it refers to has not yet been loaded).
234 struct UnresolvedExportDecl {
235 /// \brief The location of the 'export' keyword in the module map file.
236 SourceLocation ExportLoc;
238 /// \brief The name of the module.
241 /// \brief Whether this export declaration ends in a wildcard, indicating
242 /// that all of its submodules should be exported (rather than the named
247 /// \brief The set of export declarations that have yet to be resolved.
248 SmallVector<UnresolvedExportDecl, 2> UnresolvedExports;
250 /// \brief The directly used modules.
251 SmallVector<Module *, 2> DirectUses;
253 /// \brief The set of use declarations that have yet to be resolved.
254 SmallVector<ModuleId, 2> UnresolvedDirectUses;
256 /// \brief A library or framework to link against when an entity from this
259 LinkLibrary() : IsFramework(false) { }
260 LinkLibrary(const std::string &Library, bool IsFramework)
261 : Library(Library), IsFramework(IsFramework) { }
263 /// \brief The library to link against.
265 /// This will typically be a library or framework name, but can also
266 /// be an absolute path to the library or framework.
269 /// \brief Whether this is a framework rather than a library.
273 /// \brief The set of libraries or frameworks to link against when
274 /// an entity from this module is used.
275 llvm::SmallVector<LinkLibrary, 2> LinkLibraries;
277 /// \brief The set of "configuration macros", which are macros that
278 /// (intentionally) change how this module is built.
279 std::vector<std::string> ConfigMacros;
281 /// \brief An unresolved conflict with another module.
282 struct UnresolvedConflict {
283 /// \brief The (unresolved) module id.
286 /// \brief The message provided to the user when there is a conflict.
290 /// \brief The list of conflicts for which the module-id has not yet been
292 std::vector<UnresolvedConflict> UnresolvedConflicts;
294 /// \brief A conflict between two modules.
296 /// \brief The module that this module conflicts with.
299 /// \brief The message provided to the user when there is a conflict.
303 /// \brief The list of conflicts.
304 std::vector<Conflict> Conflicts;
306 /// \brief Construct a new module or submodule.
307 Module(StringRef Name, SourceLocation DefinitionLoc, Module *Parent,
308 bool IsFramework, bool IsExplicit, unsigned VisibilityID);
312 /// \brief Determine whether this module is available for use within the
313 /// current translation unit.
314 bool isAvailable() const { return IsAvailable; }
316 /// \brief Determine whether this module is available for use within the
317 /// current translation unit.
319 /// \param LangOpts The language options used for the current
320 /// translation unit.
322 /// \param Target The target options used for the current translation unit.
324 /// \param Req If this module is unavailable, this parameter
325 /// will be set to one of the requirements that is not met for use of
327 bool isAvailable(const LangOptions &LangOpts,
328 const TargetInfo &Target,
330 UnresolvedHeaderDirective &MissingHeader) const;
332 /// \brief Determine whether this module is a submodule.
333 bool isSubModule() const { return Parent != nullptr; }
335 /// \brief Determine whether this module is a submodule of the given other
337 bool isSubModuleOf(const Module *Other) const;
339 /// \brief Determine whether this module is a part of a framework,
340 /// either because it is a framework module or because it is a submodule
341 /// of a framework module.
342 bool isPartOfFramework() const {
343 for (const Module *Mod = this; Mod; Mod = Mod->Parent)
344 if (Mod->IsFramework)
350 /// \brief Determine whether this module is a subframework of another
352 bool isSubFramework() const {
353 return IsFramework && Parent && Parent->isPartOfFramework();
356 /// \brief Retrieve the full name of this module, including the path from
357 /// its top-level module.
358 std::string getFullModuleName() const;
360 /// \brief Whether the full name of this module is equal to joining
361 /// \p nameParts with "."s.
363 /// This is more efficient than getFullModuleName().
364 bool fullModuleNameIs(ArrayRef<StringRef> nameParts) const;
366 /// \brief Retrieve the top-level module for this (sub)module, which may
368 Module *getTopLevelModule() {
369 return const_cast<Module *>(
370 const_cast<const Module *>(this)->getTopLevelModule());
373 /// \brief Retrieve the top-level module for this (sub)module, which may
375 const Module *getTopLevelModule() const;
377 /// \brief Retrieve the name of the top-level module.
379 StringRef getTopLevelModuleName() const {
380 return getTopLevelModule()->Name;
383 /// \brief The serialized AST file for this module, if one was created.
384 const FileEntry *getASTFile() const {
385 return getTopLevelModule()->ASTFile;
388 /// \brief Set the serialized AST file for the top-level module of this module.
389 void setASTFile(const FileEntry *File) {
390 assert((File == nullptr || getASTFile() == nullptr ||
391 getASTFile() == File) && "file path changed");
392 getTopLevelModule()->ASTFile = File;
395 /// \brief Retrieve the directory for which this module serves as the
397 DirectoryName getUmbrellaDir() const;
399 /// \brief Retrieve the header that serves as the umbrella header for this
401 Header getUmbrellaHeader() const {
402 if (auto *E = Umbrella.dyn_cast<const FileEntry *>())
403 return Header{UmbrellaAsWritten, E};
407 /// \brief Determine whether this module has an umbrella directory that is
408 /// not based on an umbrella header.
409 bool hasUmbrellaDir() const {
410 return Umbrella && Umbrella.is<const DirectoryEntry *>();
413 /// \brief Add a top-level header associated with this module.
414 void addTopHeader(const FileEntry *File) {
416 TopHeaders.insert(File);
419 /// \brief Add a top-level header filename associated with this module.
420 void addTopHeaderFilename(StringRef Filename) {
421 TopHeaderNames.push_back(Filename);
424 /// \brief The top-level headers associated with this module.
425 ArrayRef<const FileEntry *> getTopHeaders(FileManager &FileMgr);
427 /// \brief Determine whether this module has declared its intention to
428 /// directly use another module.
429 bool directlyUses(const Module *Requested) const;
431 /// \brief Add the given feature requirement to the list of features
432 /// required by this module.
434 /// \param Feature The feature that is required by this module (and
437 /// \param RequiredState The required state of this feature: \c true
438 /// if it must be present, \c false if it must be absent.
440 /// \param LangOpts The set of language options that will be used to
441 /// evaluate the availability of this feature.
443 /// \param Target The target options that will be used to evaluate the
444 /// availability of this feature.
445 void addRequirement(StringRef Feature, bool RequiredState,
446 const LangOptions &LangOpts,
447 const TargetInfo &Target);
449 /// \brief Mark this module and all of its submodules as unavailable.
450 void markUnavailable(bool MissingRequirement = false);
452 /// \brief Find the submodule with the given name.
454 /// \returns The submodule if found, or NULL otherwise.
455 Module *findSubmodule(StringRef Name) const;
457 /// \brief Determine whether the specified module would be visible to
458 /// a lookup at the end of this module.
460 /// FIXME: This may return incorrect results for (submodules of) the
461 /// module currently being built, if it's queried before we see all
463 bool isModuleVisible(const Module *M) const {
464 if (VisibleModulesCache.empty())
465 buildVisibleModulesCache();
466 return VisibleModulesCache.count(M);
469 unsigned getVisibilityID() const { return VisibilityID; }
471 typedef std::vector<Module *>::iterator submodule_iterator;
472 typedef std::vector<Module *>::const_iterator submodule_const_iterator;
474 submodule_iterator submodule_begin() { return SubModules.begin(); }
475 submodule_const_iterator submodule_begin() const {return SubModules.begin();}
476 submodule_iterator submodule_end() { return SubModules.end(); }
477 submodule_const_iterator submodule_end() const { return SubModules.end(); }
479 llvm::iterator_range<submodule_iterator> submodules() {
480 return llvm::make_range(submodule_begin(), submodule_end());
482 llvm::iterator_range<submodule_const_iterator> submodules() const {
483 return llvm::make_range(submodule_begin(), submodule_end());
486 /// \brief Appends this module's list of exported modules to \p Exported.
488 /// This provides a subset of immediately imported modules (the ones that are
489 /// directly exported), not the complete set of exported modules.
490 void getExportedModules(SmallVectorImpl<Module *> &Exported) const;
492 static StringRef getModuleInputBufferName() {
493 return "<module-includes>";
496 /// \brief Print the module map for this module to the given stream.
498 void print(raw_ostream &OS, unsigned Indent = 0) const;
500 /// \brief Dump the contents of this module to the given output stream.
504 void buildVisibleModulesCache() const;
507 /// \brief A set of visible modules.
508 class VisibleModuleSet {
510 VisibleModuleSet() : Generation(0) {}
511 VisibleModuleSet(VisibleModuleSet &&O)
512 : ImportLocs(std::move(O.ImportLocs)), Generation(O.Generation ? 1 : 0) {
513 O.ImportLocs.clear();
517 /// Move from another visible modules set. Guaranteed to leave the source
518 /// empty and bump the generation on both.
519 VisibleModuleSet &operator=(VisibleModuleSet &&O) {
520 ImportLocs = std::move(O.ImportLocs);
521 O.ImportLocs.clear();
527 /// \brief Get the current visibility generation. Incremented each time the
528 /// set of visible modules changes in any way.
529 unsigned getGeneration() const { return Generation; }
531 /// \brief Determine whether a module is visible.
532 bool isVisible(const Module *M) const {
533 return getImportLoc(M).isValid();
536 /// \brief Get the location at which the import of a module was triggered.
537 SourceLocation getImportLoc(const Module *M) const {
538 return M->getVisibilityID() < ImportLocs.size()
539 ? ImportLocs[M->getVisibilityID()]
543 /// \brief A callback to call when a module is made visible (directly or
544 /// indirectly) by a call to \ref setVisible.
545 typedef llvm::function_ref<void(Module *M)> VisibleCallback;
546 /// \brief A callback to call when a module conflict is found. \p Path
547 /// consists of a sequence of modules from the conflicting module to the one
548 /// made visible, where each was exported by the next.
549 typedef llvm::function_ref<void(ArrayRef<Module *> Path,
550 Module *Conflict, StringRef Message)>
552 /// \brief Make a specific module visible.
553 void setVisible(Module *M, SourceLocation Loc,
554 VisibleCallback Vis = [](Module *) {},
555 ConflictCallback Cb = [](ArrayRef<Module *>, Module *,
559 /// Import locations for each visible module. Indexed by the module's
561 std::vector<SourceLocation> ImportLocs;
562 /// Visibility generation, bumped every time the visibility state changes.
566 } // end namespace clang
569 #endif // LLVM_CLANG_BASIC_MODULE_H