This class is a shared cache, that caches the 'stat' and 'open' calls to the underlying real file system, and the scanned preprocessor directives of files. More...

#include "clang/DependencyScanning/DependencyScanningFilesystem.h"

Classes
struct	CacheShard
struct	OutOfDateEntry

Public Member Functions
	DependencyScanningFilesystemSharedCache ()
CacheShard &	getShardForFilename (StringRef Filename) const
	Returns shard for the given key.
CacheShard &	getShardForUID (llvm::sys::fs::UniqueID UID) const
std::vector< OutOfDateEntry >	getOutOfDateEntries (llvm::vfs::FileSystem &UnderlyingFS) const
	Visits all cached entries and re-stat an entry using UnderlyingFS to check if the cache contains out-of-date entries.

Detailed Description

This class is a shared cache, that caches the 'stat' and 'open' calls to the underlying real file system, and the scanned preprocessor directives of files.

It is sharded based on the hash of the key to reduce the lock contention for the worker threads.

Definition at line 153 of file DependencyScanningFilesystem.h.

Constructor & Destructor Documentation

◆ DependencyScanningFilesystemSharedCache()

DependencyScanningFilesystemSharedCache::DependencyScanningFilesystemSharedCache ( )

Definition at line 83 of file DependencyScanningFilesystem.cpp.

Member Function Documentation

◆ getOutOfDateEntries()

std::vector< DependencyScanningFilesystemSharedCache::OutOfDateEntry > DependencyScanningFilesystemSharedCache::getOutOfDateEntries ( llvm::vfs::FileSystem & UnderlyingFS ) const

Visits all cached entries and re-stat an entry using UnderlyingFS to check if the cache contains out-of-date entries.

An entry can be out-of-date for two reasons:

The entry contains a stat error, indicating the file did not exist in the cache, but the file exists on the UnderlyingFS.
The entry is associated with a file whose size is different from the size of the file on the same path on the UnderlyingFS.

Definition at line 110 of file DependencyScanningFilesystem.cpp.

References clang::dependencies::DependencyScanningFilesystemSharedCache::CacheShard::CacheByFilename, clang::dependencies::DependencyScanningFilesystemSharedCache::CacheShard::CacheLock, clang::dependencies::CachedFileSystemEntry::getError(), and clang::dependencies::CachedFileSystemEntry::getStatus().