llvm/clang/include/clang/Serialization/GlobalModuleIndex.h

//===--- GlobalModuleIndex.h - Global Module Index --------------*- 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
//
//===----------------------------------------------------------------------===//
//
// This file defines the GlobalModuleIndex class, which manages a global index
// containing all of the identifiers known to the various modules within a given
// subdirectory of the module cache. It is used to improve the performance of
// queries such as "do any modules know about this identifier?"
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_SERIALIZATION_GLOBALMODULEINDEX_H
#define LLVM_CLANG_SERIALIZATION_GLOBALMODULEINDEX_H

#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Error.h"
#include <memory>
#include <utility>

namespace llvm {
class BitstreamCursor;
class MemoryBuffer;
}

namespace clang {

class FileManager;
class IdentifierIterator;
class PCHContainerOperations;
class PCHContainerReader;

namespace serialization {
  class ModuleFile;
}

/// A global index for a set of module files, providing information about
/// the identifiers within those module files.
///
/// The global index is an aid for name lookup into modules, offering a central
/// place where one can look for identifiers determine which
/// module files contain any information about that identifier. This
/// allows the client to restrict the search to only those module files known
/// to have a information about that identifier, improving performance. Moreover,
/// the global module index may know about module files that have not been
/// imported, and can be queried to determine which modules the current
/// translation could or should load to fix a problem.
class GlobalModuleIndex { … };
}

#endif