llvm/clang-tools-extra/clangd/support/ThreadsafeFS.cpp

//===--- ThreadsafeFS.cpp -------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "support/ThreadsafeFS.h"
#include "Logger.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/VirtualFileSystem.h"
#include <memory>

namespace clang {
namespace clangd {

namespace {
/// Always opens files in the underlying filesystem as "volatile", meaning they
/// won't be memory-mapped. Memory-mapping isn't desirable for clangd:
///   - edits to the underlying files change contents MemoryBuffers owned by
//      SourceManager, breaking its invariants and leading to crashes
///   - it locks files on windows, preventing edits
class VolatileFileSystem : public llvm::vfs::ProxyFileSystem { … };
} // namespace

llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>
ThreadsafeFS::view(PathRef CWD) const { … }

llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>
RealThreadsafeFS::viewImpl() const { … }
} // namespace clangd
} // namespace clang