| //===--- 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. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_LEX_HEADERSEARCH_H |
| #define LLVM_CLANG_LEX_HEADERSEARCH_H |
| |
| #include "clang/Lex/DirectoryLookup.h" |
| #include "clang/Lex/ModuleMap.h" |
| #include "llvm/ADT/ArrayRef.h" |
| #include "llvm/ADT/StringMap.h" |
| #include "llvm/ADT/StringSet.h" |
| #include "llvm/Support/Allocator.h" |
| #include "llvm/ADT/OwningPtr.h" |
| #include <vector> |
| |
| namespace clang { |
| |
| class DiagnosticsEngine; |
| class ExternalIdentifierLookup; |
| class FileEntry; |
| class FileManager; |
| class IdentifierInfo; |
| |
| /// \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 : 2; |
| |
| /// \brief Whether this header file info was supplied by an external source. |
| unsigned External : 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 The number of times the file has been included already. |
| unsigned short NumIncludes; |
| |
| /// \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; |
| |
| /// 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; |
| |
| /// \brief If this header came from a framework include, this is the name |
| /// of the framework. |
| StringRef Framework; |
| |
| HeaderFileInfo() |
| : isImport(false), isPragmaOnce(false), DirInfo(SrcMgr::C_User), |
| External(false), Resolved(false), IndexHeaderMapHeader(false), |
| NumIncludes(0), ControllingMacroID(0), ControllingMacro(0) {} |
| |
| /// \brief Retrieve the controlling macro for this header file, if |
| /// any. |
| const IdentifierInfo *getControllingMacro(ExternalIdentifierLookup *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 || |
| ControllingMacroID; |
| } |
| }; |
| |
| /// \brief An external source of header file information, which may supply |
| /// information about header files already included. |
| class ExternalHeaderFileInfoSource { |
| public: |
| 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 { |
| /// 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; |
| }; |
| |
| 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; |
| unsigned SystemDirIdx; |
| bool NoCurDirSearch; |
| |
| /// \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. |
| std::vector<HeaderFileInfo> FileInfo; |
| |
| /// \brief Keeps track of each lookup performed by LookupFile. |
| /// |
| /// The first part of the value is the 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. The second value is the entry in SearchDirs that satisfied |
| /// the query. |
| llvm::StringMap<std::pair<unsigned, unsigned>, 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. |
| typedef llvm::StringMap<std::string, llvm::BumpPtrAllocator> |
| IncludeAliasMap; |
| OwningPtr<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. |
| ModuleMap ModMap; |
| |
| /// \brief Describes whether a given directory has a module map in it. |
| llvm::DenseMap<const DirectoryEntry *, bool> DirectoryHasModuleMap; |
| |
| /// \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, as needed. |
| ExternalIdentifierLookup *ExternalLookup; |
| |
| /// \brief Entity used to look up stored header file information. |
| ExternalHeaderFileInfoSource *ExternalSource; |
| |
| // Various statistics we track for performance analysis. |
| unsigned NumIncluded; |
| unsigned NumMultiIncludeFileOptzn; |
| unsigned NumFrameworkLookups, NumSubFrameworkLookups; |
| |
| // HeaderSearch doesn't support default or copy construction. |
| HeaderSearch(const HeaderSearch&) LLVM_DELETED_FUNCTION; |
| void operator=(const HeaderSearch&) LLVM_DELETED_FUNCTION; |
| |
| friend class DirectoryLookup; |
| |
| public: |
| HeaderSearch(FileManager &FM, DiagnosticsEngine &Diags, |
| const LangOptions &LangOpts, const TargetInfo *Target); |
| ~HeaderSearch(); |
| |
| 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; |
| //LookupFileCache.clear(); |
| } |
| |
| /// \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) |
| AngledDirIdx++; |
| SystemDirIdx++; |
| } |
| |
| /// \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 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 StringRef(); |
| } |
| |
| /// \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 Forget everything we know about headers so far. |
| void ClearFileInfo() { |
| FileInfo.clear(); |
| } |
| |
| void SetExternalLookup(ExternalIdentifierLookup *EIL) { |
| ExternalLookup = EIL; |
| } |
| |
| ExternalIdentifierLookup *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 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 CurFileEnt If non-null, indicates where the \#including file is, in |
| /// case a relative search is needed. |
| /// |
| /// \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. |
| const FileEntry *LookupFile(StringRef Filename, bool isAngled, |
| const DirectoryLookup *FromDir, |
| const DirectoryLookup *&CurDir, |
| const FileEntry *CurFileEnt, |
| SmallVectorImpl<char> *SearchPath, |
| SmallVectorImpl<char> *RelativePath, |
| Module **SuggestedModule, |
| bool SkipCache = 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); |
| |
| /// \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.GetOrCreateValue(FWName).getValue(); |
| } |
| |
| /// \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(const FileEntry *File, bool isImport); |
| |
| |
| /// \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 Increment the count for the number of times the specified |
| /// FileEntry has been entered. |
| void IncrementIncludeCount(const FileEntry *File) { |
| ++getFileInfo(File).NumIncludes; |
| } |
| |
| /// \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 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 Retrieve the name of the 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 getModuleFileName(Module *Module); |
| |
| /// \brief Retrieve the name of the 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. |
| /// |
| /// \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 getModuleFileName(StringRef ModuleName); |
| |
| /// \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); |
| |
| 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. |
| /// |
| /// \param Filename The name of the file. |
| /// |
| /// \param Root The "root" directory, at which we should stop looking for |
| /// module maps. |
| bool hasModuleMap(StringRef Filename, const DirectoryEntry *Root); |
| |
| /// \brief Retrieve the module that corresponds to the given file, if any. |
| /// |
| /// \param File The header that we wish to map to a module. |
| Module *findModuleForHeader(const FileEntry *File); |
| |
| /// \brief Read the contents of the given module map file. |
| /// |
| /// \param File The module map file. |
| /// |
| /// \returns true if an error occurred, false otherwise. |
| bool loadModuleMapFile(const FileEntry *File); |
| |
| /// \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(llvm::SmallVectorImpl<Module *> &Modules); |
| |
| private: |
| /// \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); |
| |
| public: |
| /// \brief Retrieve the module map. |
| ModuleMap &getModuleMap() { return ModMap; } |
| |
| unsigned header_file_size() const { return FileInfo.size(); } |
| |
| // Used by ASTReader. |
| void setHeaderFileInfoForUID(HeaderFileInfo HFI, unsigned UID); |
| |
| /// \brief Return the HeaderFileInfo structure for the specified FileEntry. |
| const HeaderFileInfo &getFileInfo(const FileEntry *FE) const { |
| return const_cast<HeaderSearch*>(this)->getFileInfo(FE); |
| } |
| |
| // Used by external tools |
| typedef std::vector<DirectoryLookup>::const_iterator search_dir_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); |
| |
| void PrintStats(); |
| |
| size_t getTotalMemory() const; |
| |
| static std::string NormalizeDashIncludePath(StringRef File, |
| FileManager &FileMgr); |
| |
| private: |
| /// \brief Describes what happened when we tried to load a module map file. |
| enum LoadModuleMapResult { |
| /// \brief The module map file had already been loaded. |
| LMM_AlreadyLoaded, |
| /// \brief The module map file was loaded by this invocation. |
| LMM_NewlyLoaded, |
| /// \brief There is was directory with the given name. |
| LMM_NoDirectory, |
| /// \brief There was either no module map file or the module map file was |
| /// invalid. |
| LMM_InvalidModuleMap |
| }; |
| |
| /// \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. |
| /// |
| /// \returns The result of attempting to load the module map file from the |
| /// named directory. |
| LoadModuleMapResult loadModuleMapFile(StringRef DirName); |
| |
| /// \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. |
| /// |
| /// \returns The result of attempting to load the module map file from the |
| /// named directory. |
| LoadModuleMapResult loadModuleMapFile(const DirectoryEntry *Dir); |
| |
| /// \brief Return the HeaderFileInfo structure for the specified FileEntry. |
| HeaderFileInfo &getFileInfo(const FileEntry *FE); |
| }; |
| |
| } // end namespace clang |
| |
| #endif |