| //===--- 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 |