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diff --git a/gdb/dwarf-index-common.h b/gdb/dwarf-index-common.h
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+/* Things needed for both reading and writing DWARF indices.
+
+   Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef DWARF_INDEX_COMMON_H
+#define DWARF_INDEX_COMMON_H
+
+/* All offsets in the index are of this type.  It must be
+   architecture-independent.  */
+typedef uint32_t offset_type;
+
+#if WORDS_BIGENDIAN
+
+/* Convert VALUE between big- and little-endian.  */
+
+static inline offset_type
+byte_swap (offset_type value)
+{
+  offset_type result;
+
+  result = (value & 0xff) << 24;
+  result |= (value & 0xff00) << 8;
+  result |= (value & 0xff0000) >> 8;
+  result |= (value & 0xff000000) >> 24;
+  return result;
+}
+
+#define MAYBE_SWAP(V)  byte_swap (V)
+
+#else
+#define MAYBE_SWAP(V) static_cast<offset_type> (V)
+#endif /* WORDS_BIGENDIAN */
+
+/* The hash function for strings in the mapped index.  This is the same as
+   SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the
+   implementation.  This is necessary because the hash function is tied to the
+   format of the mapped index file.  The hash values do not have to match with
+   SYMBOL_HASH_NEXT.
+
+   Use INT_MAX for INDEX_VERSION if you generate the current index format.  */
+
+hashval_t mapped_index_string_hash (int index_version, const void *p);
+
+/* Symbol name hashing function as specified by DWARF-5.  */
+
+uint32_t dwarf5_djb_hash (const char *str_);
+
+#endif /* DWARF_INDEX_COMMON_H */