clang  9.0.0svn
Public Types | Public Member Functions | Static Public Member Functions | Protected Member Functions | List of all members
clang::FileSystemStatCache Class Referenceabstract

Abstract interface for introducing a FileManager cache for 'stat' system calls, which is used by precompiled and pretokenized headers to improve performance. More...

#include "clang/Basic/FileSystemStatCache.h"

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Public Types

enum  LookupResult { CacheExists, CacheMissing }
 

Public Member Functions

virtual ~FileSystemStatCache ()=default
 

Static Public Member Functions

static bool get (StringRef Path, FileData &Data, bool isFile, std::unique_ptr< llvm::vfs::File > *F, FileSystemStatCache *Cache, llvm::vfs::FileSystem &FS)
 Get the 'stat' information for the specified path, using the cache to accelerate it if possible. More...
 

Protected Member Functions

virtual LookupResult getStat (StringRef Path, FileData &Data, bool isFile, std::unique_ptr< llvm::vfs::File > *F, llvm::vfs::FileSystem &FS)=0
 

Detailed Description

Abstract interface for introducing a FileManager cache for 'stat' system calls, which is used by precompiled and pretokenized headers to improve performance.

Definition at line 59 of file FileSystemStatCache.h.

Member Enumeration Documentation

◆ LookupResult

Enumerator
CacheExists 

We know the file exists and its cached stat data.

CacheMissing 

We know that the file doesn't exist.

Definition at line 65 of file FileSystemStatCache.h.

Constructor & Destructor Documentation

◆ ~FileSystemStatCache()

virtual clang::FileSystemStatCache::~FileSystemStatCache ( )
virtualdefault

Member Function Documentation

◆ get()

bool FileSystemStatCache::get ( StringRef  Path,
FileData Data,
bool  isFile,
std::unique_ptr< llvm::vfs::File > *  F,
FileSystemStatCache Cache,
llvm::vfs::FileSystem &  FS 
)
static

Get the 'stat' information for the specified path, using the cache to accelerate it if possible.

FileSystemStatCache::get - Get the 'stat' information for the specified path, using the cache to accelerate it if possible.

Returns
true if the path does not exist or false if it exists.

If isFile is true, then this lookup should only return success for files (not directories). If it is false this lookup should only return success for directories (not files). On a successful file lookup, the implementation can optionally fill in F with a valid File object and the client guarantees that it will close it.

This returns true if the path does not exist or false if it exists.

If isFile is true, then this lookup should only return success for files (not directories). If it is false this lookup should only return success for directories (not files). On a successful file lookup, the implementation can optionally fill in FileDescriptor with a valid descriptor and the client guarantees that it will close it.

Definition at line 45 of file FileSystemStatCache.cpp.

References getStat().

Referenced by clang::FileManager::getBufferForFile().

◆ getStat()

virtual LookupResult clang::FileSystemStatCache::getStat ( StringRef  Path,
FileData Data,
bool  isFile,
std::unique_ptr< llvm::vfs::File > *  F,
llvm::vfs::FileSystem &  FS 
)
protectedpure virtual

Implemented in clang::MemorizeStatCalls.

Referenced by get().


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