Implements support for file system lookup, file system caching, and directory search management. More...

#include "clang/Basic/FileManager.h"

Inheritance diagram for clang::FileManager:

Public Member Functions
	FileManager (const FileSystemOptions &FileSystemOpts, IntrusiveRefCntPtr< llvm::vfs::FileSystem > FS=nullptr)
	Construct a file manager, optionally with a custom VFS.
	~FileManager ()
void	setStatCache (std::unique_ptr< FileSystemStatCache > statCache)
	Installs the provided FileSystemStatCache object within the FileManager.
void	clearStatCache ()
	Removes the FileSystemStatCache object from the manager.
size_t	getNumUniqueRealFiles () const
	Returns the number of unique real file entries cached by the file manager.
llvm::Expected< DirectoryEntryRef >	getDirectoryRef (StringRef DirName, bool CacheFailure=true)
	Lookup, cache, and verify the specified directory (real or virtual).
OptionalDirectoryEntryRef	getOptionalDirectoryRef (StringRef DirName, bool CacheFailure=true)
	Get a `DirectoryEntryRef` if it exists, without doing anything on error.
llvm::Expected< FileEntryRef >	getFileRef (StringRef Filename, bool OpenFile=false, bool CacheFailure=true, bool IsText=true)
	Lookup, cache, and verify the specified file (real or virtual).
llvm::Expected< FileEntryRef >	getSTDIN ()
	Get the FileEntryRef for stdin, returning an error if stdin cannot be read.
OptionalFileEntryRef	getOptionalFileRef (StringRef Filename, bool OpenFile=false, bool CacheFailure=true)
	Get a FileEntryRef if it exists, without doing anything on error.
FileSystemOptions &	getFileSystemOpts ()
	Returns the current file system options.
const FileSystemOptions &	getFileSystemOpts () const
llvm::vfs::FileSystem &	getVirtualFileSystem () const
llvm::IntrusiveRefCntPtr< llvm::vfs::FileSystem >	getVirtualFileSystemPtr () const
void	trackVFSUsage (bool Active)
	Enable or disable tracking of VFS usage.
void	setVirtualFileSystem (IntrusiveRefCntPtr< llvm::vfs::FileSystem > FS)
FileEntryRef	getVirtualFileRef (StringRef Filename, off_t Size, time_t ModificationTime)
	Retrieve a file entry for a "virtual" file that acts as if there were a file with the given name on disk.
OptionalFileEntryRef	getBypassFile (FileEntryRef VFE)
	Retrieve a FileEntry that bypasses VFE, which is expected to be a virtual file entry, to access the real file.
llvm::ErrorOr< std::unique_ptr< llvm::MemoryBuffer > >	getBufferForFile (FileEntryRef Entry, bool isVolatile=false, bool RequiresNullTerminator=true, std::optional< int64_t > MaybeLimit=std::nullopt, bool IsText=true)
	Open the specified file as a MemoryBuffer, returning a new MemoryBuffer if successful, otherwise returning null.
llvm::ErrorOr< std::unique_ptr< llvm::MemoryBuffer > >	getBufferForFile (StringRef Filename, bool isVolatile=false, bool RequiresNullTerminator=true, std::optional< int64_t > MaybeLimit=std::nullopt, bool IsText=true) const
std::error_code	getNoncachedStatValue (StringRef Path, llvm::vfs::Status &Result)
	Get the 'stat' information for the given `Path`.
bool	FixupRelativePath (SmallVectorImpl< char > &path) const
	If path is not absolute and FileSystemOptions set the working directory, the path is modified to be relative to the given working directory.
bool	makeAbsolutePath (SmallVectorImpl< char > &Path) const
	Makes `Path` absolute taking into account FileSystemOptions and the working directory option.
void	GetUniqueIDMapping (SmallVectorImpl< OptionalFileEntryRef > &UIDToFiles) const
	Produce an array mapping from the unique IDs assigned to each file to the corresponding FileEntryRef.
StringRef	getCanonicalName (DirectoryEntryRef Dir)
	Retrieve the canonical name for a given directory.
StringRef	getCanonicalName (FileEntryRef File)
	Retrieve the canonical name for a given file.
void	PrintStats () const
void	AddStats (const FileManager &Other)
	Import statistics from a child FileManager and add them to this current FileManager.

Detailed Description

Implements support for file system lookup, file system caching, and directory search management.

This also handles more advanced properties, such as uniquing files based on "inode", so that a file with two names (e.g. symlinked) will be treated as a single file.

Definition at line 53 of file FileManager.h.

Constructor & Destructor Documentation

◆ FileManager()

FileManager::FileManager	(	const FileSystemOptions &	FileSystemOpts,
		IntrusiveRefCntPtr< llvm::vfs::FileSystem >	FS = nullptr )

Construct a file manager, optionally with a custom VFS.

Parameters

FS	if non-null, the VFS to use. Otherwise uses llvm::vfs::getRealFileSystem().

Definition at line 44 of file FileManager.cpp.

Referenced by AddStats().

◆ ~FileManager()

FileManager::~FileManager ( )

default

Member Function Documentation

◆ AddStats()

void FileManager::AddStats ( const FileManager & Other )

Import statistics from a child FileManager and add them to this current FileManager.

Definition at line 659 of file FileManager.cpp.

References FileManager(), and clang::Other.

Referenced by clang::CompilerInstance::compileModule().

◆ clearStatCache()

void FileManager::clearStatCache ( )

Removes the FileSystemStatCache object from the manager.

Definition at line 61 of file FileManager.cpp.

Referenced by clang::tooling::FrontendActionFactory::runInvocation().

◆ FixupRelativePath()

bool FileManager::FixupRelativePath ( SmallVectorImpl< char > & path ) const

If path is not absolute and FileSystemOptions set the working directory, the path is modified to be relative to the given working directory.

Returns: true if path changed.

Definition at line 477 of file FileManager.cpp.

Referenced by getNoncachedStatValue(), and makeAbsolutePath().

◆ getBufferForFile() [1/2]

llvm::ErrorOr< std::unique_ptr< llvm::MemoryBuffer > > FileManager::getBufferForFile	(	FileEntryRef	Entry,
		bool	isVolatile = false,
		bool	RequiresNullTerminator = true,
		std::optional< int64_t >	MaybeLimit = std::nullopt,
		bool	IsText = true )

Open the specified file as a MemoryBuffer, returning a new MemoryBuffer if successful, otherwise returning null.

The IsText parameter controls whether the file should be opened as a text or binary file, and should be set to false if the file contents should be treated as binary.

Definition at line 513 of file FileManager.cpp.

References clang::FileEntry::closeFile(), clang::FileEntryRef::getFileEntry(), clang::FileEntryRef::getName(), clang::FileEntry::getSize(), clang::FileEntry::isNamedPipe(), and clang::Result.

Referenced by clang::HeaderMap::Create(), clang::extractapi::APIIgnoresList::create(), clang::PrintPreambleAction::ExecuteAction(), and clang::SrcMgr::ContentCache::getBufferOrNone().

◆ getBufferForFile() [2/2]

llvm::ErrorOr< std::unique_ptr< llvm::MemoryBuffer > > clang::FileManager::getBufferForFile	(	StringRef	Filename,
		bool	isVolatile = false,
		bool	RequiresNullTerminator = true,
		std::optional< int64_t >	MaybeLimit = std::nullopt,
		bool	IsText = true ) const

inline

Definition at line 261 of file FileManager.h.

◆ getBypassFile()

OptionalFileEntryRef FileManager::getBypassFile ( FileEntryRef VFE )

Retrieve a FileEntry that bypasses VFE, which is expected to be a virtual file entry, to access the real file.

The returned FileEntry will have the same filename as FE but a different identity and its own stat.

This should be used only for rare error recovery paths because it bypasses all mapping and uniquing, blindly creating a new FileEntry. There is no attempt to deduplicate these; if you bypass the same file twice, you get two new file entries.

Definition at line 448 of file FileManager.cpp.

References clang::FileEntryRef::getDir(), clang::FileEntryRef::getFileEntry(), and clang::FileEntryRef::getName().

◆ getCanonicalName() [1/2]

StringRef FileManager::getCanonicalName ( DirectoryEntryRef Dir )

Retrieve the canonical name for a given directory.

This is a very expensive operation, despite its results being cached, and should only be used when the physical layout of the file system is required, which is (almost) never.

Definition at line 613 of file FileManager.cpp.

References getCanonicalName(), and clang::DirectoryEntryRef::getName().

Referenced by clang::ModuleMap::canonicalizeModuleMapPath(), getCanonicalName(), and getCanonicalName().

◆ getCanonicalName() [2/2]

StringRef FileManager::getCanonicalName ( FileEntryRef File )

Retrieve the canonical name for a given file.

This is a very expensive operation, despite its results being cached, and should only be used when the physical layout of the file system is required, which is (almost) never.

Definition at line 617 of file FileManager.cpp.

References clang::File, and getCanonicalName().

◆ getDirectoryRef()

llvm::Expected< DirectoryEntryRef > FileManager::getDirectoryRef	(	StringRef	DirName,
		bool	CacheFailure = true )

Lookup, cache, and verify the specified directory (real or virtual).

This returns a std::error_code if there was an error reading the directory. On success, returns the reference to the directory entry together with the exact path that was used to access a file by a particular call to getDirectoryRef.

Parameters

CacheFailure If true and the file does not exist, we'll cache the failure to find this file.

Definition at line 137 of file FileManager.cpp.

Referenced by clang::ModuleMap::canonicalizeModuleMapPath(), getOptionalDirectoryRef(), and clang::Preprocessor::LookupEmbedFile().

◆ getFileRef()

llvm::Expected< FileEntryRef > FileManager::getFileRef	(	StringRef	Filename,
		bool	OpenFile = false,
		bool	CacheFailure = true,
		bool	IsText = true )

Lookup, cache, and verify the specified file (real or virtual).

Return the reference to the file entry together with the exact path that was used to access a file by a particular call to getFileRef. If the underlying VFS is a redirecting VFS that uses external file names, the returned FileEntryRef will use the external name instead of the filename that was passed to this method.

This returns a std::error_code if there was an error loading the file, or a FileEntryRef otherwise.

Parameters

OpenFile	if true and the file exists, it will be opened.
CacheFailure	If true and the file does not exist, we'll cache the failure to find this file.

Definition at line 197 of file FileManager.cpp.

References clang::cast(), getDirectoryFromFile(), clang::DirectoryEntryRef::getDirEntry(), and clang::isa().

Referenced by clang::tooling::formatAndApplyAllReplacements(), getOptionalFileRef(), and clang::Preprocessor::LookupEmbedFile().

◆ getFileSystemOpts() [1/2]

FileSystemOptions & clang::FileManager::getFileSystemOpts ( )

inline

Returns the current file system options.

Definition at line 216 of file FileManager.h.

◆ getFileSystemOpts() [2/2]

const FileSystemOptions & clang::FileManager::getFileSystemOpts ( ) const

inline

Definition at line 217 of file FileManager.h.

◆ getNoncachedStatValue()

std::error_code FileManager::getNoncachedStatValue	(	StringRef	Path,
		llvm::vfs::Status &	Result )

Get the 'stat' information for the given Path.

If the path is relative, it will be resolved against the WorkingDir of the FileManager's FileSystemOptions.

Returns: a std::error_code describing an error, if there was one

Definition at line 583 of file FileManager.cpp.

References FixupRelativePath(), and clang::Result.

◆ getNumUniqueRealFiles()

size_t clang::FileManager::getNumUniqueRealFiles ( ) const

inline

Returns the number of unique real file entries cached by the file manager.

Definition at line 159 of file FileManager.h.

◆ getOptionalDirectoryRef()

OptionalDirectoryEntryRef clang::FileManager::getOptionalDirectoryRef	(	StringRef	DirName,
		bool	CacheFailure = true )

inline

Get a DirectoryEntryRef if it exists, without doing anything on error.

Definition at line 175 of file FileManager.h.

References getDirectoryRef().

Referenced by clang::ApplyHeaderSearchOptions(), clang::FrontendAction::BeginSourceFile(), computeRelativePath(), clang::api_notes::APINotesManager::getCurrentModuleAPINotes(), and loadModuleMapForModuleBuild().

◆ getOptionalFileRef()

OptionalFileEntryRef clang::FileManager::getOptionalFileRef	(	StringRef	Filename,
		bool	OpenFile = false,
		bool	CacheFailure = true )

inline

Get a FileEntryRef if it exists, without doing anything on error.

Definition at line 208 of file FileManager.h.

References getFileRef().

Referenced by clang::tooling::applyAllReplacements(), clang::FrontendAction::BeginSourceFile(), EnableCodeCompletion(), clang::installapi::findLibrary(), clang::DirectoryLookup::LookupFile(), and prepareToBuildModule().

◆ getSTDIN()

llvm::Expected< FileEntryRef > FileManager::getSTDIN ( )

Get the FileEntryRef for stdin, returning an error if stdin cannot be read.

This reads and caches stdin before returning. Subsequent calls return the same file entry, and a reference to the cached input is returned by calls to getBufferForFile.

Definition at line 345 of file FileManager.cpp.

References getVirtualFileRef().

◆ GetUniqueIDMapping()

void FileManager::GetUniqueIDMapping ( SmallVectorImpl< OptionalFileEntryRef > & UIDToFiles ) const

Produce an array mapping from the unique IDs assigned to each file to the corresponding FileEntryRef.

Definition at line 595 of file FileManager.cpp.

References clang::FileEntryRef::getName(), clang::FileEntryRef::getUID(), and clang::isa().

◆ getVirtualFileRef()

FileEntryRef FileManager::getVirtualFileRef	(	StringRef	Filename,
		off_t	Size,
		time_t	ModificationTime )

Retrieve a file entry for a "virtual" file that acts as if there were a file with the given name on disk.

The file itself is not accessed.

Definition at line 371 of file FileManager.cpp.

References clang::cast(), getDirectoryFromFile(), and clang::isa().

Referenced by getSTDIN().

◆ getVirtualFileSystem()

llvm::vfs::FileSystem & clang::FileManager::getVirtualFileSystem ( ) const

inline

Definition at line 219 of file FileManager.h.

Referenced by clang::installapi::enumerateFiles(), clang::CompilerInstance::getVirtualFileSystem(), clang::ASTUnit::LoadFromCompilerInvocationAction(), PrintStats(), and clang::tooling::FrontendActionFactory::runInvocation().

◆ getVirtualFileSystemPtr()

llvm::IntrusiveRefCntPtr< llvm::vfs::FileSystem > clang::FileManager::getVirtualFileSystemPtr ( ) const

inline

Definition at line 221 of file FileManager.h.

Referenced by clang::CodeGenAction::ExecuteAction(), and clang::CompilerInstance::getVirtualFileSystemPtr().

◆ makeAbsolutePath()

bool FileManager::makeAbsolutePath ( SmallVectorImpl< char > & Path ) const

Makes Path absolute taking into account FileSystemOptions and the working directory option.

Returns: true if Path changed to absolute.

Definition at line 490 of file FileManager.cpp.

References FixupRelativePath().

Referenced by makeAbsoluteAndPreferred(), and clang::Rewriter::overwriteChangedFiles().

◆ PrintStats()

void FileManager::PrintStats ( ) const

Definition at line 667 of file FileManager.cpp.

References getVirtualFileSystem(), and clang::T.

Referenced by clang::CompilerInstance::ExecuteAction().

◆ setStatCache()

void FileManager::setStatCache ( std::unique_ptr< FileSystemStatCache > statCache )

Installs the provided FileSystemStatCache object within the FileManager.

Ownership of this object is transferred to the FileManager.

Parameters

statCache the new stat cache to install. Ownership of this object is transferred to the FileManager.

Definition at line 56 of file FileManager.cpp.

◆ setVirtualFileSystem()

void clang::FileManager::setVirtualFileSystem ( IntrusiveRefCntPtr< llvm::vfs::FileSystem > FS )

inline

Definition at line 229 of file FileManager.h.

◆ trackVFSUsage()

void FileManager::trackVFSUsage ( bool Active )

Enable or disable tracking of VFS usage.

Used to not track full header search and implicit modulemap lookup.

Definition at line 364 of file FileManager.cpp.

The documentation for this class was generated from the following files:

include/clang/Basic/FileManager.h
lib/Basic/FileManager.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ FileManager()

◆ ~FileManager()

Member Function Documentation

◆ AddStats()

◆ clearStatCache()

◆ FixupRelativePath()

◆ getBufferForFile() [1/2]

◆ getBufferForFile() [2/2]

◆ getBypassFile()

◆ getCanonicalName() [1/2]

◆ getCanonicalName() [2/2]

◆ getDirectoryRef()

◆ getFileRef()

◆ getFileSystemOpts() [1/2]

◆ getFileSystemOpts() [2/2]

◆ getNoncachedStatValue()

◆ getNumUniqueRealFiles()

◆ getOptionalDirectoryRef()

◆ getOptionalFileRef()

◆ getSTDIN()

◆ GetUniqueIDMapping()

◆ getVirtualFileRef()

◆ getVirtualFileSystem()

◆ getVirtualFileSystemPtr()

◆ makeAbsolutePath()

◆ PrintStats()

◆ setStatCache()

◆ setVirtualFileSystem()

◆ trackVFSUsage()