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//===--- HeaderMap.h - A file that acts like dir of symlinks ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the HeaderMap interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LEX_HEADERMAP_H
#define LLVM_CLANG_LEX_HEADERMAP_H
namespace llvm {
class MemoryBuffer;
}
namespace clang {
class FileEntry;
class FileManager;
struct HMapBucket;
struct HMapHeader;
/// This class represents an Apple concept known as a 'header map'. To the
/// #include file resolution process, it basically acts like a directory of
/// symlinks to files. Its advantages are that it is dense and more efficient
/// to create and process than a directory of symlinks.
class HeaderMap {
HeaderMap(const HeaderMap&); // DO NOT IMPLEMENT
void operator=(const HeaderMap&); // DO NOT IMPLEMENT
const llvm::MemoryBuffer *FileBuffer;
bool NeedsBSwap;
HeaderMap(const llvm::MemoryBuffer *File, bool BSwap)
: FileBuffer(File), NeedsBSwap(BSwap) {
}
public:
~HeaderMap();
/// HeaderMap::Create - This attempts to load the specified file as a header
/// map. If it doesn't look like a HeaderMap, it gives up and returns null.
static const HeaderMap *Create(const FileEntry *FE);
/// LookupFile - Check to see if the specified relative filename is located in
/// this HeaderMap. If so, open it and return its FileEntry.
const FileEntry *LookupFile(const char *FilenameStart,const char *FilenameEnd,
FileManager &FM) const;
/// getFileName - Return the filename of the headermap.
const char *getFileName() const;
/// dump - Print the contents of this headermap to stderr.
void dump() const;
private:
unsigned getEndianAdjustedWord(unsigned X) const;
const HMapHeader &getHeader() const;
HMapBucket getBucket(unsigned BucketNo) const;
const char *getString(unsigned StrTabIdx) const;
};
} // end namespace clang.
#endif
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