1 //===--- HeaderMap.h - A file that acts like dir of symlinks ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the HeaderMap interface.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_CLANG_LEX_HEADERMAP_H
15 #define LLVM_CLANG_LEX_HEADERMAP_H
17 #include "clang/Basic/LLVM.h"
18 #include "llvm/Support/Compiler.h"
30 /// This class represents an Apple concept known as a 'header map'. To the
31 /// \#include file resolution process, it basically acts like a directory of
32 /// symlinks to files. Its advantages are that it is dense and more efficient
33 /// to create and process than a directory of symlinks.
35 HeaderMap(const HeaderMap &) = delete;
36 void operator=(const HeaderMap &) = delete;
38 std::unique_ptr<const llvm::MemoryBuffer> FileBuffer;
41 HeaderMap(std::unique_ptr<const llvm::MemoryBuffer> File, bool BSwap)
42 : FileBuffer(std::move(File)), NeedsBSwap(BSwap) {}
44 /// HeaderMap::Create - This attempts to load the specified file as a header
45 /// map. If it doesn't look like a HeaderMap, it gives up and returns null.
46 static const HeaderMap *Create(const FileEntry *FE, FileManager &FM);
48 /// LookupFile - Check to see if the specified relative filename is located in
49 /// this HeaderMap. If so, open it and return its FileEntry.
50 /// If RawPath is not NULL and the file is found, RawPath will be set to the
51 /// raw path at which the file was found in the file system. For example,
52 /// for a search path ".." and a filename "../file.h" this would be
54 const FileEntry *LookupFile(StringRef Filename, FileManager &FM) const;
56 /// If the specified relative filename is located in this HeaderMap return
57 /// the filename it is mapped to, otherwise return an empty StringRef.
58 StringRef lookupFilename(StringRef Filename,
59 SmallVectorImpl<char> &DestPath) const;
61 /// getFileName - Return the filename of the headermap.
62 const char *getFileName() const;
64 /// dump - Print the contents of this headermap to stderr.
68 unsigned getEndianAdjustedWord(unsigned X) const;
69 const HMapHeader &getHeader() const;
70 HMapBucket getBucket(unsigned BucketNo) const;
71 const char *getString(unsigned StrTabIdx) const;
74 } // end namespace clang.