A virtual file system optimized for the dependency discovery. More...

#include "clang/DependencyScanning/DependencyScanningFilesystem.h"

Inheritance diagram for clang::dependencies::DependencyScanningWorkerFilesystem:

Public Member Functions
	DependencyScanningWorkerFilesystem (DependencyScanningFilesystemSharedCache &SharedCache, IntrusiveRefCntPtr< llvm::vfs::FileSystem > FS)
llvm::ErrorOr< llvm::vfs::Status >	status (const Twine &Path) override
llvm::ErrorOr< std::unique_ptr< llvm::vfs::File > >	openFileForRead (const Twine &Path) override
std::error_code	getRealPath (const Twine &Path, SmallVectorImpl< char > &Output) override
std::error_code	setCurrentWorkingDirectory (const Twine &Path) override
llvm::ErrorOr< EntryRef >	getOrCreateFileSystemEntry (StringRef Filename)
	Returns entry for the given filename.
bool	ensureDirectiveTokensArePopulated (EntryRef Entry)
	Ensure the directive tokens are populated for this file entry.
std::optional< ArrayRef< dependency_directives_scan::Directive > >	getDirectiveTokens (const Twine &Path)
bool	exists (const Twine &Path) override
	Check whether `Path` exists.

Static Public Attributes
static const char	ID = 0

Detailed Description

A virtual file system optimized for the dependency discovery.

It is primarily designed to work with source files whose contents was preprocessed to remove any tokens that are unlikely to affect the dependency computation.

This is not a thread safe VFS. A single instance is meant to be used only in one thread. Multiple instances are allowed to service multiple threads running in parallel.

Definition at line 366 of file DependencyScanningFilesystem.h.

Constructor & Destructor Documentation

◆ DependencyScanningWorkerFilesystem()

DependencyScanningWorkerFilesystem::DependencyScanningWorkerFilesystem	(	DependencyScanningFilesystemSharedCache &	SharedCache,
		IntrusiveRefCntPtr< llvm::vfs::FileSystem >	FS )

Definition at line 246 of file DependencyScanningFilesystem.cpp.

References DependencyScanningWorkerFilesystem().

Referenced by DependencyScanningWorkerFilesystem().

Member Function Documentation

◆ ensureDirectiveTokensArePopulated()

bool DependencyScanningWorkerFilesystem::ensureDirectiveTokensArePopulated ( EntryRef Entry )

Ensure the directive tokens are populated for this file entry.

Returns true if the directive tokens are populated for this file entry, false if not (i.e. this entry is not a file or its scan fails).

Definition at line 42 of file DependencyScanningFilesystem.cpp.

References clang::dependencies::CachedFileContents::DepDirectives, clang::dependencies::CachedFileContents::DepDirectiveTokens, clang::dependencies::CachedFileContents::Original, clang::scanSourceForDependencyDirectives(), and clang::dependencies::CachedFileContents::ValueLock.

Referenced by getDirectiveTokens().

◆ exists()

bool DependencyScanningWorkerFilesystem::exists ( const Twine & Path )

override

Check whether Path exists.

By default checks cached result of status(), and falls back on FS if unable to do so.

Definition at line 333 of file DependencyScanningFilesystem.cpp.

References status().

◆ getDirectiveTokens()

std::optional< ArrayRef< dependency_directives_scan::Directive > > clang::dependencies::DependencyScanningWorkerFilesystem::getDirectiveTokens ( const Twine & Path )

inline