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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13944 91177308-0d34-0410-b5e6-96231b3b80d8
171 lines
6.1 KiB
C++
171 lines
6.1 KiB
C++
//===- Support/FileUtilities.h - File System Utilities ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a family of utility functions which are useful for doing
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// various things with files.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_FILEUTILITIES_H
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#define SUPPORT_FILEUTILITIES_H
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#include <string>
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namespace llvm {
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/// CheckMagic - Returns true IFF the file named FN begins with Magic. FN must
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/// name a readable file.
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///
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bool CheckMagic (const std::string &FN, const std::string &Magic);
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/// IsArchive - Returns true IFF the file named FN appears to be a "ar" library
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/// archive. The file named FN must exist.
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///
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bool IsArchive (const std::string &FN);
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/// IsBytecode - Returns true IFF the file named FN appears to be an LLVM
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/// bytecode file. The file named FN must exist.
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///
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bool IsBytecode (const std::string &FN);
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/// IsSharedObject - Returns trus IFF the file named FN appears to be a shared
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/// object with an ELF header. The file named FN must exist.
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///
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bool IsSharedObject(const std::string &FN);
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/// FileOpenable - Returns true IFF Filename names an existing regular file
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/// which we can successfully open.
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///
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bool FileOpenable(const std::string &Filename);
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/// DiffFiles - Compare the two files specified, returning true if they are
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/// different or if there is a file error. If you specify a string to fill in
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/// for the error option, it will set the string to an error message if an error
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/// occurs, allowing the caller to distinguish between a failed diff and a file
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/// system error.
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///
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bool DiffFiles(const std::string &FileA, const std::string &FileB,
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std::string *Error = 0);
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/// CopyFile - Copy the specified source file to the specified destination,
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/// overwriting destination if it exists. This returns true on failure.
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///
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bool CopyFile(const std::string &Dest, const std::string &Src);
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/// MoveFileOverIfUpdated - If the file specified by New is different than Old,
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/// or if Old does not exist, move the New file over the Old file. Otherwise,
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/// remove the New file.
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///
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void MoveFileOverIfUpdated(const std::string &New, const std::string &Old);
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/// removeFile - Delete the specified file.
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///
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void removeFile(const std::string &Filename);
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/// getUniqueFilename - Return a filename with the specified prefix. If the
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/// file does not exist yet, return it, otherwise add a suffix to make it
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/// unique.
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///
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std::string getUniqueFilename(const std::string &FilenameBase);
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/// MakeFileExecutable - This method turns on whatever access attributes are
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/// needed to make the specified file executable. It returns true on success.
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/// In case of failure, the file's access attributes are unspecified.
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///
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bool MakeFileExecutable(const std::string &Filename);
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/// MakeFileReadable - This method turns on whatever access attributes are
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/// needed to make the specified file readable. It returns true on success.
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/// In case of failure, the file's access attributes are unspecified.
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///
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bool MakeFileReadable(const std::string &Filename);
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/// getFileSize - Return the size of the specified file in bytes, or -1 if the
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/// file cannot be read or does not exist.
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long long getFileSize(const std::string &Filename);
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/// getFileTimestamp - Get the last modified time for the specified file in an
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/// unspecified format. This is useful to allow checking to see if a file was
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/// updated since that last time the timestampt was aquired. If the file does
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/// not exist or there is an error getting the time-stamp, zero is returned.
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unsigned long long getFileTimestamp(const std::string &Filename);
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/// ReadFileIntoAddressSpace - Attempt to map the specific file into the
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/// address space of the current process for reading. If this succeeds,
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/// return the address of the buffer and the length of the file mapped. On
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/// failure, return null.
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void *ReadFileIntoAddressSpace(const std::string &Filename, unsigned &Length);
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/// UnmapFileFromAddressSpace - Remove the specified file from the current
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/// address space.
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void UnmapFileFromAddressSpace(void *Buffer, unsigned Length);
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/// FDHandle - Simple handle class to make sure a file descriptor gets closed
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/// when the object is destroyed. This handle acts similarly to an
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/// std::auto_ptr, in that the copy constructor and assignment operators
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/// transfer ownership of the handle. This means that FDHandle's do not have
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/// value semantics.
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///
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class FDHandle {
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int FD;
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public:
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FDHandle() : FD(-1) {}
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FDHandle(int fd) : FD(fd) {}
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FDHandle(FDHandle &RHS) : FD(RHS.FD) {
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RHS.FD = -1; // Transfer ownership
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}
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~FDHandle() throw();
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/// get - Get the current file descriptor, without releasing ownership of it.
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int get() const { return FD; }
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operator int() const { return FD; }
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FDHandle &operator=(int fd) throw();
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FDHandle &operator=(FDHandle &RHS) {
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int fd = RHS.FD;
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RHS.FD = -1; // Transfer ownership
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return operator=(fd);
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}
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/// release - Take ownership of the file descriptor away from the FDHandle
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/// object, so that the file is not closed when the FDHandle is destroyed.
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int release() {
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int Ret = FD;
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FD = -1;
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return Ret;
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}
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};
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/// FileRemover - This class is a simple object meant to be stack allocated.
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/// If an exception is thrown from a region, the object removes the filename
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/// specified (if deleteIt is true).
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///
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class FileRemover {
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std::string Filename;
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bool DeleteIt;
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public:
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FileRemover(const std::string &filename, bool deleteIt = true)
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: Filename(filename), DeleteIt(deleteIt) {}
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~FileRemover() {
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if (DeleteIt) removeFile(Filename);
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}
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/// releaseFile - Take ownership of the file away from the FileRemover so it
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/// will not be removed when the object is destroyed.
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void releaseFile() { DeleteIt = false; }
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};
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} // End llvm namespace
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#endif
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