Coverage Report

Created: 2020-02-25 14:32

/Users/buildslave/jenkins/workspace/coverage/llvm-project/clang/include/clang/Lex/HeaderMap.h
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//===--- HeaderMap.h - A file that acts like dir of symlinks ----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the HeaderMap interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LEX_HEADERMAP_H
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#define LLVM_CLANG_LEX_HEADERMAP_H
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/LLVM.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include <memory>
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namespace clang {
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struct HMapBucket;
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struct HMapHeader;
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/// Implementation for \a HeaderMap that doesn't depend on \a FileManager.
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class HeaderMapImpl {
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  std::unique_ptr<const llvm::MemoryBuffer> FileBuffer;
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  bool NeedsBSwap;
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public:
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  HeaderMapImpl(std::unique_ptr<const llvm::MemoryBuffer> File, bool NeedsBSwap)
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      : FileBuffer(std::move(File)), NeedsBSwap(NeedsBSwap) {}
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  // Check for a valid header and extract the byte swap.
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  static bool checkHeader(const llvm::MemoryBuffer &File, bool &NeedsByteSwap);
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  /// If the specified relative filename is located in this HeaderMap return
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  /// the filename it is mapped to, otherwise return an empty StringRef.
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  StringRef lookupFilename(StringRef Filename,
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                           SmallVectorImpl<char> &DestPath) const;
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  /// Return the filename of the headermap.
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  StringRef getFileName() const;
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  /// Print the contents of this headermap to stderr.
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  void dump() const;
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private:
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  unsigned getEndianAdjustedWord(unsigned X) const;
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  const HMapHeader &getHeader() const;
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  HMapBucket getBucket(unsigned BucketNo) const;
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  /// Look up the specified string in the string table.  If the string index is
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  /// not valid, return None.
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  Optional<StringRef> getString(unsigned StrTabIdx) const;
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};
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/// This class represents an Apple concept known as a 'header map'.  To the
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/// \#include file resolution process, it basically acts like a directory of
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/// symlinks to files.  Its advantages are that it is dense and more efficient
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/// to create and process than a directory of symlinks.
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class HeaderMap : private HeaderMapImpl {
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  HeaderMap(std::unique_ptr<const llvm::MemoryBuffer> File, bool BSwap)
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      : HeaderMapImpl(std::move(File), BSwap) {}
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public:
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  /// This attempts to load the specified file as a header map.  If it doesn't
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  /// look like a HeaderMap, it gives up and returns null.
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  static std::unique_ptr<HeaderMap> Create(const FileEntry *FE,
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                                           FileManager &FM);
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  /// Check to see if the specified relative filename is located in this
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  /// HeaderMap.  If so, open it and return its FileEntry.  If RawPath is not
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  /// NULL and the file is found, RawPath will be set to the raw path at which
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  /// the file was found in the file system. For example, for a search path
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  /// ".." and a filename "../file.h" this would be "../../file.h".
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  Optional<FileEntryRef> LookupFile(StringRef Filename, FileManager &FM) const;
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  using HeaderMapImpl::lookupFilename;
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  using HeaderMapImpl::getFileName;
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  using HeaderMapImpl::dump;
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};
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} // end namespace clang.
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#endif