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//===- HeaderSearch.h - Resolve Header File Locations -----------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file defines the HeaderSearch interface.
#include "clang/Basic/SourceLocation.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/DirectoryLookup.h"
#include "clang/Lex/ModuleMap.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Allocator.h"
#include <cassert>
#include <cstddef>
#include <memory>
#include <string>
#include <utility>
#include <vector>
namespace clang {
class DiagnosticsEngine;
class DirectoryEntry;
class ExternalPreprocessorSource;
class FileEntry;
class FileManager;
class HeaderMap;
class HeaderSearchOptions;
class IdentifierInfo;
class LangOptions;
class Module;
class Preprocessor;
class TargetInfo;
/// \brief The preprocessor keeps track of this information for each
/// file that is \#included.
struct HeaderFileInfo {
/// \brief True if this is a \#import'd or \#pragma once file.
unsigned isImport : 1;
/// \brief True if this is a \#pragma once file.
unsigned isPragmaOnce : 1;
/// DirInfo - Keep track of whether this is a system header, and if so,
/// whether it is C++ clean or not. This can be set by the include paths or
/// by \#pragma gcc system_header. This is an instance of
/// SrcMgr::CharacteristicKind.
unsigned DirInfo : 3;
/// \brief Whether this header file info was supplied by an external source,
/// and has not changed since.
unsigned External : 1;
/// \brief Whether this header is part of a module.
unsigned isModuleHeader : 1;
/// \brief Whether this header is part of the module that we are building.
unsigned isCompilingModuleHeader : 1;
/// \brief Whether this structure is considered to already have been
/// "resolved", meaning that it was loaded from the external source.
unsigned Resolved : 1;
/// \brief Whether this is a header inside a framework that is currently
/// being built.
/// When a framework is being built, the headers have not yet been placed
/// into the appropriate framework subdirectories, and therefore are
/// provided via a header map. This bit indicates when this is one of
/// those framework headers.
unsigned IndexHeaderMapHeader : 1;
/// \brief Whether this file has been looked up as a header.
unsigned IsValid : 1;
/// \brief The number of times the file has been included already.
unsigned short NumIncludes = 0;
/// \brief The ID number of the controlling macro.
/// This ID number will be non-zero when there is a controlling
/// macro whose IdentifierInfo may not yet have been loaded from
/// external storage.
unsigned ControllingMacroID = 0;
/// If this file has a \#ifndef XXX (or equivalent) guard that
/// protects the entire contents of the file, this is the identifier
/// for the macro that controls whether or not it has any effect.
/// Note: Most clients should use getControllingMacro() to access
/// the controlling macro of this header, since
/// getControllingMacro() is able to load a controlling macro from
/// external storage.
const IdentifierInfo *ControllingMacro = nullptr;
/// \brief If this header came from a framework include, this is the name
/// of the framework.
StringRef Framework;
: isImport(false), isPragmaOnce(false), DirInfo(SrcMgr::C_User),
External(false), isModuleHeader(false), isCompilingModuleHeader(false),
Resolved(false), IndexHeaderMapHeader(false), IsValid(false) {}
/// \brief Retrieve the controlling macro for this header file, if
/// any.
const IdentifierInfo *
getControllingMacro(ExternalPreprocessorSource *External);
/// \brief Determine whether this is a non-default header file info, e.g.,
/// it corresponds to an actual header we've included or tried to include.
bool isNonDefault() const {
return isImport || isPragmaOnce || NumIncludes || ControllingMacro ||
/// \brief An external source of header file information, which may supply
/// information about header files already included.
class ExternalHeaderFileInfoSource {
virtual ~ExternalHeaderFileInfoSource();
/// \brief Retrieve the header file information for the given file entry.
/// \returns Header file information for the given file entry, with the
/// \c External bit set. If the file entry is not known, return a
/// default-constructed \c HeaderFileInfo.
virtual HeaderFileInfo GetHeaderFileInfo(const FileEntry *FE) = 0;
/// \brief Encapsulates the information needed to find the file referenced
/// by a \#include or \#include_next, (sub-)framework lookup, etc.
class HeaderSearch {
friend class DirectoryLookup;
/// This structure is used to record entries in our framework cache.
struct FrameworkCacheEntry {
/// The directory entry which should be used for the cached framework.
const DirectoryEntry *Directory;
/// Whether this framework has been "user-specified" to be treated as if it
/// were a system framework (even if it was found outside a system framework
/// directory).
bool IsUserSpecifiedSystemFramework;
/// \brief Header-search options used to initialize this header search.
std::shared_ptr<HeaderSearchOptions> HSOpts;
DiagnosticsEngine &Diags;
FileManager &FileMgr;
/// \#include search path information. Requests for \#include "x" search the
/// directory of the \#including file first, then each directory in SearchDirs
/// consecutively. Requests for <x> search the current dir first, then each
/// directory in SearchDirs, starting at AngledDirIdx, consecutively. If
/// NoCurDirSearch is true, then the check for the file in the current
/// directory is suppressed.
std::vector<DirectoryLookup> SearchDirs;
unsigned AngledDirIdx = 0;
unsigned SystemDirIdx = 0;
bool NoCurDirSearch = false;
/// \brief \#include prefixes for which the 'system header' property is
/// overridden.
/// For a \#include "x" or \#include \<x> directive, the last string in this
/// list which is a prefix of 'x' determines whether the file is treated as
/// a system header.
std::vector<std::pair<std::string, bool>> SystemHeaderPrefixes;
/// \brief The path to the module cache.
std::string ModuleCachePath;
/// \brief All of the preprocessor-specific data about files that are
/// included, indexed by the FileEntry's UID.
mutable std::vector<HeaderFileInfo> FileInfo;
/// Keeps track of each lookup performed by LookupFile.
struct LookupFileCacheInfo {
/// Starting index in SearchDirs that the cached search was performed from.
/// If there is a hit and this value doesn't match the current query, the
/// cache has to be ignored.
unsigned StartIdx = 0;
/// The entry in SearchDirs that satisfied the query.
unsigned HitIdx = 0;
/// This is non-null if the original filename was mapped to a framework
/// include via a headermap.
const char *MappedName = nullptr;
/// Default constructor -- Initialize all members with zero.
LookupFileCacheInfo() = default;
void reset(unsigned StartIdx) {
this->StartIdx = StartIdx;
this->MappedName = nullptr;
llvm::StringMap<LookupFileCacheInfo, llvm::BumpPtrAllocator> LookupFileCache;
/// \brief Collection mapping a framework or subframework
/// name like "Carbon" to the Carbon.framework directory.
llvm::StringMap<FrameworkCacheEntry, llvm::BumpPtrAllocator> FrameworkMap;
/// IncludeAliases - maps include file names (including the quotes or
/// angle brackets) to other include file names. This is used to support the
/// include_alias pragma for Microsoft compatibility.
using IncludeAliasMap =
llvm::StringMap<std::string, llvm::BumpPtrAllocator>;
std::unique_ptr<IncludeAliasMap> IncludeAliases;
/// HeaderMaps - This is a mapping from FileEntry -> HeaderMap, uniquing
/// headermaps. This vector owns the headermap.
std::vector<std::pair<const FileEntry *, const HeaderMap *>> HeaderMaps;
/// \brief The mapping between modules and headers.
mutable ModuleMap ModMap;
/// \brief Describes whether a given directory has a module map in it.
llvm::DenseMap<const DirectoryEntry *, bool> DirectoryHasModuleMap;
/// \brief Set of module map files we've already loaded, and a flag indicating
/// whether they were valid or not.
llvm::DenseMap<const FileEntry *, bool> LoadedModuleMaps;
/// \brief Uniqued set of framework names, which is used to track which
/// headers were included as framework headers.
llvm::StringSet<llvm::BumpPtrAllocator> FrameworkNames;
/// \brief Entity used to resolve the identifier IDs of controlling
/// macros into IdentifierInfo pointers, and keep the identifire up to date,
/// as needed.
ExternalPreprocessorSource *ExternalLookup = nullptr;
/// \brief Entity used to look up stored header file information.
ExternalHeaderFileInfoSource *ExternalSource = nullptr;
// Various statistics we track for performance analysis.
unsigned NumIncluded = 0;
unsigned NumMultiIncludeFileOptzn = 0;
unsigned NumFrameworkLookups = 0;
unsigned NumSubFrameworkLookups = 0;
HeaderSearch(std::shared_ptr<HeaderSearchOptions> HSOpts,
SourceManager &SourceMgr, DiagnosticsEngine &Diags,
const LangOptions &LangOpts, const TargetInfo *Target);
HeaderSearch(const HeaderSearch &) = delete;
HeaderSearch &operator=(const HeaderSearch &) = delete;
/// \brief Retrieve the header-search options with which this header search
/// was initialized.
HeaderSearchOptions &getHeaderSearchOpts() const { return *HSOpts; }
FileManager &getFileMgr() const { return FileMgr; }
/// \brief Interface for setting the file search paths.
void SetSearchPaths(const std::vector<DirectoryLookup> &dirs,
unsigned angledDirIdx, unsigned systemDirIdx,
bool noCurDirSearch) {
assert(angledDirIdx <= systemDirIdx && systemDirIdx <= dirs.size() &&
"Directory indicies are unordered");
SearchDirs = dirs;
AngledDirIdx = angledDirIdx;
SystemDirIdx = systemDirIdx;
NoCurDirSearch = noCurDirSearch;
/// \brief Add an additional search path.
void AddSearchPath(const DirectoryLookup &dir, bool isAngled) {
unsigned idx = isAngled ? SystemDirIdx : AngledDirIdx;
SearchDirs.insert(SearchDirs.begin() + idx, dir);
if (!isAngled)
/// \brief Set the list of system header prefixes.
void SetSystemHeaderPrefixes(ArrayRef<std::pair<std::string, bool>> P) {
SystemHeaderPrefixes.assign(P.begin(), P.end());
/// \brief Checks whether the map exists or not.
bool HasIncludeAliasMap() const { return (bool)IncludeAliases; }
/// \brief Map the source include name to the dest include name.
/// The Source should include the angle brackets or quotes, the dest
/// should not. This allows for distinction between <> and "" headers.
void AddIncludeAlias(StringRef Source, StringRef Dest) {
if (!IncludeAliases)
IncludeAliases.reset(new IncludeAliasMap);
(*IncludeAliases)[Source] = Dest;
/// MapHeaderToIncludeAlias - Maps one header file name to a different header
/// file name, for use with the include_alias pragma. Note that the source
/// file name should include the angle brackets or quotes. Returns StringRef
/// as null if the header cannot be mapped.
StringRef MapHeaderToIncludeAlias(StringRef Source) {
assert(IncludeAliases && "Trying to map headers when there's no map");
// Do any filename replacements before anything else
IncludeAliasMap::const_iterator Iter = IncludeAliases->find(Source);
if (Iter != IncludeAliases->end())
return Iter->second;
return {};
/// \brief Set the path to the module cache.
void setModuleCachePath(StringRef CachePath) {
ModuleCachePath = CachePath;
/// \brief Retrieve the path to the module cache.
StringRef getModuleCachePath() const { return ModuleCachePath; }
/// \brief Consider modules when including files from this directory.
void setDirectoryHasModuleMap(const DirectoryEntry* Dir) {
DirectoryHasModuleMap[Dir] = true;
/// \brief Forget everything we know about headers so far.
void ClearFileInfo() {
void SetExternalLookup(ExternalPreprocessorSource *EPS) {
ExternalLookup = EPS;
ExternalPreprocessorSource *getExternalLookup() const {
return ExternalLookup;
/// \brief Set the external source of header information.
void SetExternalSource(ExternalHeaderFileInfoSource *ES) {
ExternalSource = ES;
/// \brief Set the target information for the header search, if not
/// already known.
void setTarget(const TargetInfo &Target);
/// \brief Given a "foo" or \<foo> reference, look up the indicated file,
/// return null on failure.
/// \returns If successful, this returns 'UsedDir', the DirectoryLookup member
/// the file was found in, or null if not applicable.
/// \param IncludeLoc Used for diagnostics if valid.
/// \param isAngled indicates whether the file reference is a <> reference.
/// \param CurDir If non-null, the file was found in the specified directory
/// search location. This is used to implement \#include_next.
/// \param Includers Indicates where the \#including file(s) are, in case
/// relative searches are needed. In reverse order of inclusion.
/// \param SearchPath If non-null, will be set to the search path relative
/// to which the file was found. If the include path is absolute, SearchPath
/// will be set to an empty string.
/// \param RelativePath If non-null, will be set to the path relative to
/// SearchPath at which the file was found. This only differs from the
/// Filename for framework includes.
/// \param SuggestedModule If non-null, and the file found is semantically
/// part of a known module, this will be set to the module that should
/// be imported instead of preprocessing/parsing the file found.
/// \param IsMapped If non-null, and the search involved header maps, set to
/// true.
const FileEntry *LookupFile(
StringRef Filename, SourceLocation IncludeLoc, bool isAngled,
const DirectoryLookup *FromDir, const DirectoryLookup *&CurDir,
ArrayRef<std::pair<const FileEntry *, const DirectoryEntry *>> Includers,
SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule,
bool *IsMapped, bool SkipCache = false, bool BuildSystemModule = false);
/// \brief Look up a subframework for the specified \#include file.
/// For example, if \#include'ing <HIToolbox/HIToolbox.h> from
/// within ".../Carbon.framework/Headers/Carbon.h", check to see if
/// HIToolbox is a subframework within Carbon.framework. If so, return
/// the FileEntry for the designated file, otherwise return null.
const FileEntry *LookupSubframeworkHeader(
StringRef Filename, const FileEntry *RelativeFileEnt,
SmallVectorImpl<char> *SearchPath, SmallVectorImpl<char> *RelativePath,
Module *RequestingModule, ModuleMap::KnownHeader *SuggestedModule);
/// \brief Look up the specified framework name in our framework cache.
/// \returns The DirectoryEntry it is in if we know, null otherwise.
FrameworkCacheEntry &LookupFrameworkCache(StringRef FWName) {
return FrameworkMap[FWName];
/// \brief Mark the specified file as a target of of a \#include,
/// \#include_next, or \#import directive.
/// \return false if \#including the file will have no effect or true
/// if we should include it.
bool ShouldEnterIncludeFile(Preprocessor &PP, const FileEntry *File,
bool isImport, bool ModulesEnabled,
Module *CorrespondingModule);
/// \brief Return whether the specified file is a normal header,
/// a system header, or a C++ friendly system header.
SrcMgr::CharacteristicKind getFileDirFlavor(const FileEntry *File) {
return (SrcMgr::CharacteristicKind)getFileInfo(File).DirInfo;
/// \brief Mark the specified file as a "once only" file, e.g. due to
/// \#pragma once.
void MarkFileIncludeOnce(const FileEntry *File) {
HeaderFileInfo &FI = getFileInfo(File);
FI.isImport = true;
FI.isPragmaOnce = true;
/// \brief Mark the specified file as a system header, e.g. due to
/// \#pragma GCC system_header.
void MarkFileSystemHeader(const FileEntry *File) {
getFileInfo(File).DirInfo = SrcMgr::C_System;
/// \brief Mark the specified file as part of a module.
void MarkFileModuleHeader(const FileEntry *File,
ModuleMap::ModuleHeaderRole Role,
bool IsCompiledModuleHeader);
/// \brief Increment the count for the number of times the specified
/// FileEntry has been entered.
void IncrementIncludeCount(const FileEntry *File) {
/// \brief Mark the specified file as having a controlling macro.
/// This is used by the multiple-include optimization to eliminate
/// no-op \#includes.
void SetFileControllingMacro(const FileEntry *File,
const IdentifierInfo *ControllingMacro) {
getFileInfo(File).ControllingMacro = ControllingMacro;
/// \brief Return true if this is the first time encountering this header.
bool FirstTimeLexingFile(const FileEntry *File) {
return getFileInfo(File).NumIncludes == 1;
/// \brief Determine whether this file is intended to be safe from
/// multiple inclusions, e.g., it has \#pragma once or a controlling
/// macro.
/// This routine does not consider the effect of \#import
bool isFileMultipleIncludeGuarded(const FileEntry *File);
/// CreateHeaderMap - This method returns a HeaderMap for the specified
/// FileEntry, uniquing them through the 'HeaderMaps' datastructure.
const HeaderMap *CreateHeaderMap(const FileEntry *FE);
/// \brief Get filenames for all registered header maps.
void getHeaderMapFileNames(SmallVectorImpl<std::string> &Names) const;
/// \brief Retrieve the name of the cached module file that should be used
/// to load the given module.
/// \param Module The module whose module file name will be returned.
/// \returns The name of the module file that corresponds to this module,
/// or an empty string if this module does not correspond to any module file.
std::string getCachedModuleFileName(Module *Module);
/// \brief Retrieve the name of the prebuilt module file that should be used
/// to load a module with the given name.
/// \param ModuleName The module whose module file name will be returned.
/// \param FileMapOnly If true, then only look in the explicit module name
// to file name map and skip the directory search.
/// \returns The name of the module file that corresponds to this module,
/// or an empty string if this module does not correspond to any module file.
std::string getPrebuiltModuleFileName(StringRef ModuleName,
bool FileMapOnly = false);
/// \brief Retrieve the name of the (to-be-)cached module file that should
/// be used to load a module with the given name.
/// \param ModuleName The module whose module file name will be returned.
/// \param ModuleMapPath A path that when combined with \c ModuleName
/// uniquely identifies this module. See Module::ModuleMap.
/// \returns The name of the module file that corresponds to this module,
/// or an empty string if this module does not correspond to any module file.
std::string getCachedModuleFileName(StringRef ModuleName,
StringRef ModuleMapPath);
/// \brief Lookup a module Search for a module with the given name.
/// \param ModuleName The name of the module we're looking for.
/// \param AllowSearch Whether we are allowed to search in the various
/// search directories to produce a module definition. If not, this lookup
/// will only return an already-known module.
/// \returns The module with the given name.
Module *lookupModule(StringRef ModuleName, bool AllowSearch = true);
/// \brief Try to find a module map file in the given directory, returning
/// \c nullptr if none is found.
const FileEntry *lookupModuleMapFile(const DirectoryEntry *Dir,
bool IsFramework);
void IncrementFrameworkLookupCount() { ++NumFrameworkLookups; }
/// \brief Determine whether there is a module map that may map the header
/// with the given file name to a (sub)module.
/// Always returns false if modules are disabled.
/// \param Filename The name of the file.
/// \param Root The "root" directory, at which we should stop looking for
/// module maps.
/// \param IsSystem Whether the directories we're looking at are system
/// header directories.
bool hasModuleMap(StringRef Filename, const DirectoryEntry *Root,
bool IsSystem);
/// \brief Retrieve the module that corresponds to the given file, if any.
/// \param File The header that we wish to map to a module.
/// \param AllowTextual Whether we want to find textual headers too.
ModuleMap::KnownHeader findModuleForHeader(const FileEntry *File,
bool AllowTextual = false) const;
/// \brief Read the contents of the given module map file.
/// \param File The module map file.
/// \param IsSystem Whether this file is in a system header directory.
/// \param ID If the module map file is already mapped (perhaps as part of
/// processing a preprocessed module), the ID of the file.
/// \param Offset [inout] An offset within ID to start parsing. On exit,
/// filled by the end of the parsed contents (either EOF or the
/// location of an end-of-module-map pragma).
/// \param OriginalModuleMapFile The original path to the module map file,
/// used to resolve paths within the module (this is required when
/// building the module from preprocessed source).
/// \returns true if an error occurred, false otherwise.
bool loadModuleMapFile(const FileEntry *File, bool IsSystem,
FileID ID = FileID(), unsigned *Offset = nullptr,
StringRef OriginalModuleMapFile = StringRef());
/// \brief Collect the set of all known, top-level modules.
/// \param Modules Will be filled with the set of known, top-level modules.
void collectAllModules(SmallVectorImpl<Module *> &Modules);
/// \brief Load all known, top-level system modules.
void loadTopLevelSystemModules();
/// \brief Lookup a module with the given module name and search-name.
/// \param ModuleName The name of the module we're looking for.
/// \param SearchName The "search-name" to derive filesystem paths from
/// when looking for the module map; this is usually equal to ModuleName,
/// but for compatibility with some buggy frameworks, additional attempts
/// may be made to find the module under a related-but-different search-name.
/// \returns The module named ModuleName.
Module *lookupModule(StringRef ModuleName, StringRef SearchName);
/// \brief Retrieve a module with the given name, which may be part of the
/// given framework.
/// \param Name The name of the module to retrieve.
/// \param Dir The framework directory (e.g., ModuleName.framework).
/// \param IsSystem Whether the framework directory is part of the system
/// frameworks.
/// \returns The module, if found; otherwise, null.
Module *loadFrameworkModule(StringRef Name,
const DirectoryEntry *Dir,
bool IsSystem);
/// \brief Load all of the module maps within the immediate subdirectories
/// of the given search directory.
void loadSubdirectoryModuleMaps(DirectoryLookup &SearchDir);
/// \brief Find and suggest a usable module for the given file.
/// \return \c true if the file can be used, \c false if we are not permitted to
/// find this file due to requirements from \p RequestingModule.
bool findUsableModuleForHeader(const FileEntry *File,
const DirectoryEntry *Root,
Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule,
bool IsSystemHeaderDir);
/// \brief Find and suggest a usable module for the given file, which is part of
/// the specified framework.
/// \return \c true if the file can be used, \c false if we are not permitted to
/// find this file due to requirements from \p RequestingModule.
bool findUsableModuleForFrameworkHeader(
const FileEntry *File, StringRef FrameworkDir, Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule, bool IsSystemFramework);
/// \brief Look up the file with the specified name and determine its owning
/// module.
const FileEntry *
getFileAndSuggestModule(StringRef FileName, SourceLocation IncludeLoc,
const DirectoryEntry *Dir, bool IsSystemHeaderDir,
Module *RequestingModule,
ModuleMap::KnownHeader *SuggestedModule);
/// \brief Retrieve the module map.
ModuleMap &getModuleMap() { return ModMap; }
/// \brief Retrieve the module map.
const ModuleMap &getModuleMap() const { return ModMap; }
unsigned header_file_size() const { return FileInfo.size(); }
/// \brief Return the HeaderFileInfo structure for the specified FileEntry,
/// in preparation for updating it in some way.
HeaderFileInfo &getFileInfo(const FileEntry *FE);
/// \brief Return the HeaderFileInfo structure for the specified FileEntry,
/// if it has ever been filled in.
/// \param WantExternal Whether the caller wants purely-external header file
/// info (where \p External is true).
const HeaderFileInfo *getExistingFileInfo(const FileEntry *FE,
bool WantExternal = true) const;
// Used by external tools
using search_dir_iterator = std::vector<DirectoryLookup>::const_iterator;
search_dir_iterator search_dir_begin() const { return SearchDirs.begin(); }
search_dir_iterator search_dir_end() const { return SearchDirs.end(); }
unsigned search_dir_size() const { return SearchDirs.size(); }
search_dir_iterator quoted_dir_begin() const {
return SearchDirs.begin();
search_dir_iterator quoted_dir_end() const {
return SearchDirs.begin() + AngledDirIdx;
search_dir_iterator angled_dir_begin() const {
return SearchDirs.begin() + AngledDirIdx;
search_dir_iterator angled_dir_end() const {
return SearchDirs.begin() + SystemDirIdx;
search_dir_iterator system_dir_begin() const {
return SearchDirs.begin() + SystemDirIdx;
search_dir_iterator system_dir_end() const { return SearchDirs.end(); }
/// \brief Retrieve a uniqued framework name.
StringRef getUniqueFrameworkName(StringRef Framework);
/// \brief Suggest a path by which the specified file could be found, for
/// use in diagnostics to suggest a #include.
/// \param IsSystem If non-null, filled in to indicate whether the suggested
/// path is relative to a system header directory.
std::string suggestPathToFileForDiagnostics(const FileEntry *File,
bool *IsSystem = nullptr);
void PrintStats();
size_t getTotalMemory() const;
/// \brief Describes what happened when we tried to load a module map file.
enum LoadModuleMapResult {
/// \brief The module map file had already been loaded.
/// \brief The module map file was loaded by this invocation.
/// \brief There is was directory with the given name.
/// \brief There was either no module map file or the module map file was
/// invalid.
LoadModuleMapResult loadModuleMapFileImpl(const FileEntry *File,
bool IsSystem,
const DirectoryEntry *Dir,
FileID ID = FileID(),
unsigned *Offset = nullptr);
/// \brief Try to load the module map file in the given directory.
/// \param DirName The name of the directory where we will look for a module
/// map file.
/// \param IsSystem Whether this is a system header directory.
/// \param IsFramework Whether this is a framework directory.
/// \returns The result of attempting to load the module map file from the
/// named directory.
LoadModuleMapResult loadModuleMapFile(StringRef DirName, bool IsSystem,
bool IsFramework);
/// \brief Try to load the module map file in the given directory.
/// \param Dir The directory where we will look for a module map file.
/// \param IsSystem Whether this is a system header directory.
/// \param IsFramework Whether this is a framework directory.
/// \returns The result of attempting to load the module map file from the
/// named directory.
LoadModuleMapResult loadModuleMapFile(const DirectoryEntry *Dir,
bool IsSystem, bool IsFramework);
} // namespace clang