1 //===- llvm/Support/FileUtilities.h - File System Utilities -----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines a family of utility functions which are useful for doing 11 // various things with files. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_SUPPORT_FILEUTILITIES_H 16 #define LLVM_SUPPORT_FILEUTILITIES_H 17 18 #include "llvm/Support/FileSystem.h" 19 #include "llvm/Support/Path.h" 20 21 namespace llvm { 22 23 /// DiffFilesWithTolerance - Compare the two files specified, returning 0 if 24 /// the files match, 1 if they are different, and 2 if there is a file error. 25 /// This function allows you to specify an absolute and relative FP error that 26 /// is allowed to exist. If you specify a string to fill in for the error 27 /// option, it will set the string to an error message if an error occurs, or 28 /// if the files are different. 29 /// 30 int DiffFilesWithTolerance(StringRef FileA, 31 StringRef FileB, 32 double AbsTol, double RelTol, 33 std::string *Error = nullptr); 34 35 36 /// FileRemover - This class is a simple object meant to be stack allocated. 37 /// If an exception is thrown from a region, the object removes the filename 38 /// specified (if deleteIt is true). 39 /// 40 class FileRemover { 41 SmallString<128> Filename; 42 bool DeleteIt; 43 public: 44 FileRemover() : DeleteIt(false) {} 45 46 explicit FileRemover(const Twine& filename, bool deleteIt = true) 47 : DeleteIt(deleteIt) { 48 filename.toVector(Filename); 49 } 50 51 ~FileRemover() { 52 if (DeleteIt) { 53 // Ignore problems deleting the file. 54 sys::fs::remove(Filename); 55 } 56 } 57 58 /// setFile - Give ownership of the file to the FileRemover so it will 59 /// be removed when the object is destroyed. If the FileRemover already 60 /// had ownership of a file, remove it first. 61 void setFile(const Twine& filename, bool deleteIt = true) { 62 if (DeleteIt) { 63 // Ignore problems deleting the file. 64 sys::fs::remove(Filename); 65 } 66 67 Filename.clear(); 68 filename.toVector(Filename); 69 DeleteIt = deleteIt; 70 } 71 72 /// releaseFile - Take ownership of the file away from the FileRemover so it 73 /// will not be removed when the object is destroyed. 74 void releaseFile() { DeleteIt = false; } 75 }; 76 } // End llvm namespace 77 78 #endif 79
