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//===-- FileCollector.h -----------------------------------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/VirtualFileSystem.h"
#include <mutex>
namespace llvm {
/// Collects files into a directory and generates a mapping that can be used by
/// the VFS.
class FileCollector {
FileCollector(std::string Root, std::string OverlayRoot);
void addFile(const Twine &file);
/// Write the yaml mapping (for the VFS) to the given file.
std::error_code writeMapping(StringRef mapping_file);
/// Copy the files into the root directory.
/// When StopOnError is true (the default) we abort as soon as one file
/// cannot be copied. This is relatively common, for example when a file was
/// removed after it was added to the mapping.
std::error_code copyFiles(bool StopOnError = true);
/// Create a VFS that collects all the paths that might be looked at by the
/// file system accesses.
static IntrusiveRefCntPtr<vfs::FileSystem>
createCollectorVFS(IntrusiveRefCntPtr<vfs::FileSystem> BaseFS,
std::shared_ptr<FileCollector> Collector);
void addFileImpl(StringRef SrcPath);
bool markAsSeen(StringRef Path) {
if (Path.empty())
return false;
return Seen.insert(Path).second;
bool getRealPath(StringRef SrcPath, SmallVectorImpl<char> &Result);
void addFileToMapping(StringRef VirtualPath, StringRef RealPath) {
VFSWriter.addFileMapping(VirtualPath, RealPath);
/// Synchronizes adding files.
std::mutex Mutex;
/// The root directory where files are copied.
std::string Root;
/// The root directory where the VFS overlay lives.
std::string OverlayRoot;
/// Tracks already seen files so they can be skipped.
StringSet<> Seen;
/// The yaml mapping writer.
vfs::YAMLVFSWriter VFSWriter;
/// Caches RealPath calls when resolving symlinks.
StringMap<std::string> SymlinkMap;
} // end namespace llvm