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      1 //===-- FileRemapper.h - File Remapping Helper ------------------*- 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 #ifndef LLVM_CLANG_ARCMIGRATE_FILEREMAPPER_H
     11 #define LLVM_CLANG_ARCMIGRATE_FILEREMAPPER_H
     12 
     13 #include "clang/Basic/LLVM.h"
     14 #include "llvm/ADT/OwningPtr.h"
     15 #include "llvm/ADT/PointerUnion.h"
     16 #include "llvm/ADT/DenseMap.h"
     17 #include "llvm/ADT/StringRef.h"
     18 
     19 namespace llvm {
     20   class MemoryBuffer;
     21 }
     22 
     23 namespace clang {
     24   class FileManager;
     25   class FileEntry;
     26   class DiagnosticsEngine;
     27   class CompilerInvocation;
     28 
     29 namespace arcmt {
     30 
     31 class FileRemapper {
     32   // FIXME: Reuse the same FileManager for multiple ASTContexts.
     33   llvm::OwningPtr<FileManager> FileMgr;
     34 
     35   typedef llvm::PointerUnion<const FileEntry *, llvm::MemoryBuffer *> Target;
     36   typedef llvm::DenseMap<const FileEntry *, Target> MappingsTy;
     37   MappingsTy FromToMappings;
     38 
     39   llvm::DenseMap<const FileEntry *, const FileEntry *> ToFromMappings;
     40 
     41 public:
     42   FileRemapper();
     43   ~FileRemapper();
     44 
     45   bool initFromDisk(StringRef outputDir, DiagnosticsEngine &Diag,
     46                     bool ignoreIfFilesChanged);
     47   bool flushToDisk(StringRef outputDir, DiagnosticsEngine &Diag);
     48 
     49   bool overwriteOriginal(DiagnosticsEngine &Diag,
     50                          StringRef outputDir = StringRef());
     51 
     52   void remap(StringRef filePath, llvm::MemoryBuffer *memBuf);
     53   void remap(StringRef filePath, StringRef newPath);
     54 
     55   void applyMappings(CompilerInvocation &CI) const;
     56 
     57   void transferMappingsAndClear(CompilerInvocation &CI);
     58 
     59   void clear(StringRef outputDir = StringRef());
     60 
     61 private:
     62   void remap(const FileEntry *file, llvm::MemoryBuffer *memBuf);
     63   void remap(const FileEntry *file, const FileEntry *newfile);
     64 
     65   const FileEntry *getOriginalFile(StringRef filePath);
     66   void resetTarget(Target &targ);
     67 
     68   bool report(const Twine &err, DiagnosticsEngine &Diag);
     69 
     70   std::string getRemapInfoFile(StringRef outputDir);
     71 };
     72 
     73 } // end namespace arcmt
     74 
     75 }  // end namespace clang
     76 
     77 #endif
     78