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diff --git a/clang-r353983/include/lld/Core/ArchiveLibraryFile.h b/clang-r353983/include/lld/Core/ArchiveLibraryFile.h
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+++ b/clang-r353983/include/lld/Core/ArchiveLibraryFile.h
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+//===- Core/ArchiveLibraryFile.h - Models static library ------------------===//
+//
+// 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 LLD_CORE_ARCHIVE_LIBRARY_FILE_H
+#define LLD_CORE_ARCHIVE_LIBRARY_FILE_H
+
+#include "lld/Core/File.h"
+#include <set>
+
+namespace lld {
+
+///
+/// The ArchiveLibraryFile subclass of File is used to represent unix
+/// static library archives.  These libraries provide no atoms to the
+/// initial set of atoms linked.  Instead, when the Resolver will query
+/// ArchiveLibraryFile instances for specific symbols names using the
+/// find() method.  If the archive contains an object file which has a
+/// DefinedAtom whose scope is not translationUnit, then that entire
+/// object file File is returned.
+///
+class ArchiveLibraryFile : public File {
+public:
+  static bool classof(const File *f) {
+    return f->kind() == kindArchiveLibrary;
+  }
+
+  /// Check if any member of the archive contains an Atom with the
+  /// specified name and return the File object for that member, or nullptr.
+  virtual File *find(StringRef name) = 0;
+
+  virtual std::error_code
+  parseAllMembers(std::vector<std::unique_ptr<File>> &result) = 0;
+
+protected:
+  /// only subclasses of ArchiveLibraryFile can be instantiated
+  ArchiveLibraryFile(StringRef path) : File(path, kindArchiveLibrary) {}
+};
+
+} // namespace lld
+
+#endif // LLD_CORE_ARCHIVE_LIBRARY_FILE_H