llvm/clang-tools-extra/clang-tidy/ExpandModularHeadersPPCallbacks.h

//===- ExpandModularHeadersPPCallbacks.h - clang-tidy -----------*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_TOOLING_EXPANDMODULARHEADERSPPCALLBACKS_H_
#define LLVM_CLANG_TOOLING_EXPANDMODULARHEADERSPPCALLBACKS_H_

#include "clang/Lex/PPCallbacks.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/DenseSet.h"

namespace llvm::vfs {
class OverlayFileSystem;
class InMemoryFileSystem;
} // namespace llvm::vfs

namespace clang {
class CompilerInstance;

namespace serialization {
class ModuleFile;
} // namespace serialization

namespace tooling {

/// Handles PPCallbacks and re-runs preprocessing of the whole
/// translation unit with modules disabled.
///
/// This way it's possible to get PPCallbacks for the whole translation unit
/// including the contents of the modular headers and all their transitive
/// includes.
///
/// This allows existing tools based on PPCallbacks to retain their functionality
/// when running with C++ modules enabled. This only works in the backwards
/// compatible modules mode, i.e. when code can still be parsed in non-modular
/// way.
class ExpandModularHeadersPPCallbacks : public PPCallbacks { … };

} // namespace tooling
} // namespace clang

#endif // LLVM_CLANG_TOOLING_EXPANDMODULARHEADERSPPCALLBACKS_H_