llvm/clang/include/clang/Basic/FileSystemStatCache.h

//===- FileSystemStatCache.h - Caching for 'stat' calls ---------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file
/// Defines the FileSystemStatCache interface.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_BASIC_FILESYSTEMSTATCACHE_H
#define LLVM_CLANG_BASIC_FILESYSTEMSTATCACHE_H

#include "clang/Basic/LLVM.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/VirtualFileSystem.h"
#include <cstdint>
#include <ctime>
#include <memory>
#include <optional>
#include <string>
#include <utility>

namespace clang {

/// Abstract interface for introducing a FileManager cache for 'stat'
/// system calls, which is used by precompiled and pretokenized headers to
/// improve performance.
class FileSystemStatCache { … };

/// A stat "cache" that can be used by FileManager to keep
/// track of the results of stat() calls that occur throughout the
/// execution of the front end.
class MemorizeStatCalls : public FileSystemStatCache { … };

} // namespace clang

#endif // LLVM_CLANG_BASIC_FILESYSTEMSTATCACHE_H