src/llvm/include/llvm/Support/FileUtilities.h

   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.str());
  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.str());
  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