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//===--- FileManager.h - File System Probing and Caching --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the FileManager interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_FILEMANAGER_H
#define LLVM_CLANG_FILEMANAGER_H
#include "llvm/ADT/StringMap.h"
#include <map>
#include <string>
// FIXME: Enhance libsystem to support inode and other fields in stat.
#include <sys/types.h>
namespace clang {
class FileManager;
/// DirectoryEntry - Cached information about one directory on the disk.
///
class DirectoryEntry {
const char *Name; // Name of the directory.
friend class FileManager;
public:
DirectoryEntry() : Name(0) {}
const char *getName() const { return Name; }
};
/// FileEntry - Cached information about one file on the disk.
///
class FileEntry {
const char *Name; // Name of the directory.
off_t Size; // File size in bytes.
time_t ModTime; // Modification time of file.
const DirectoryEntry *Dir; // Directory file lives in.
unsigned UID; // A unique (small) ID for the file.
friend class FileManager;
public:
FileEntry() : Name(0) {}
const char *getName() const { return Name; }
off_t getSize() const { return Size; }
unsigned getUID() const { return UID; }
time_t getModificationTime() const { return ModTime; }
/// getDir - Return the directory the file lives in.
///
const DirectoryEntry *getDir() const { return Dir; }
};
/// FileManager - 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.
///
class FileManager {
/// UniqueDirs/UniqueFiles - Cache from ID's to existing directories/files.
///
std::map<std::pair<dev_t, ino_t>, DirectoryEntry> UniqueDirs;
std::map<std::pair<dev_t, ino_t>, FileEntry> UniqueFiles;
/// DirEntries/FileEntries - This is a cache of directory/file entries we have
/// looked up. The actual Entry is owned by UniqueFiles/UniqueDirs above.
///
llvm::StringMap<DirectoryEntry*> DirEntries;
llvm::StringMap<FileEntry*> FileEntries;
/// NextFileUID - Each FileEntry we create is assigned a unique ID #.
///
unsigned NextFileUID;
// Statistics.
unsigned NumDirLookups, NumFileLookups;
unsigned NumDirCacheMisses, NumFileCacheMisses;
public:
FileManager() : DirEntries(64), FileEntries(64), NextFileUID(0) {
NumDirLookups = NumFileLookups = 0;
NumDirCacheMisses = NumFileCacheMisses = 0;
}
/// getDirectory - Lookup, cache, and verify the specified directory. This
/// returns null if the directory doesn't exist.
///
const DirectoryEntry *getDirectory(const std::string &Filename) {
return getDirectory(&Filename[0], &Filename[0] + Filename.size());
}
const DirectoryEntry *getDirectory(const char *FileStart,const char *FileEnd);
/// getFile - Lookup, cache, and verify the specified file. This returns null
/// if the file doesn't exist.
///
const FileEntry *getFile(const std::string &Filename) {
return getFile(&Filename[0], &Filename[0] + Filename.size());
}
const FileEntry *getFile(const char *FilenameStart,
const char *FilenameEnd);
void PrintStats() const;
};
} // end namespace clang
#endif
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