//===- Core/SharedLibraryFile.h - Models shared libraries as Atoms --------===//
//
//                             The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef LLD_CORE_SHARED_LIBRARY_FILE_H
#define LLD_CORE_SHARED_LIBRARY_FILE_H

#include "lld/Core/File.h"

namespace lld {

///
/// The SharedLibraryFile subclass of File is used to represent dynamic
/// shared libraries being linked against.
///
class SharedLibraryFile : public File {
public:
  static bool classof(const File *f) {
    return f->kind() == kindSharedLibrary;
  }

  /// Check if the shared library exports a symbol with the specified name.
  /// If so, return a SharedLibraryAtom which represents that exported
  /// symbol.  Otherwise return nullptr.
  virtual OwningAtomPtr<SharedLibraryAtom> exports(StringRef name) const = 0;

  // Returns the install name.
  virtual StringRef getDSOName() const = 0;

  const AtomRange<DefinedAtom> defined() const override {
    return _definedAtoms;
  }

  const AtomRange<UndefinedAtom> undefined() const override {
    return _undefinedAtoms;
  }

  const AtomRange<SharedLibraryAtom> sharedLibrary() const override {
    return _sharedLibraryAtoms;
  }

  const AtomRange<AbsoluteAtom> absolute() const override {
    return _absoluteAtoms;
  }

  void clearAtoms() override {
    _definedAtoms.clear();
    _undefinedAtoms.clear();
    _sharedLibraryAtoms.clear();
    _absoluteAtoms.clear();
  }

protected:
  /// only subclasses of SharedLibraryFile can be instantiated
  explicit SharedLibraryFile(StringRef path) : File(path, kindSharedLibrary) {}

  AtomVector<DefinedAtom> _definedAtoms;
  AtomVector<UndefinedAtom> _undefinedAtoms;
  AtomVector<SharedLibraryAtom> _sharedLibraryAtoms;
  AtomVector<AbsoluteAtom> _absoluteAtoms;
};

} // namespace lld

#endif // LLD_CORE_SHARED_LIBRARY_FILE_H