gdb/dwarf2: split .gdb_index reading code to own file

Move everything related to reading .gdb_index from read.c to
read-gdb-index.c.  The only entry point exposed by read-gdb-index.{c,h}
is dwarf2_read_gdb_index.

Change-Id: I1e32c8f0720086538de8d2f612f27545377099bc
Approved-By: Tom Tromey <tom@tromey.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/gdb/dwarf2/read-gdb-index.h b/gdb/dwarf2/read-gdb-index.h
new file mode 100644
index 0000000..b69de4a
--- /dev/null
+++ b/gdb/dwarf2/read-gdb-index.h
@@ -0,0 +1,47 @@
+/* Reading code for .gdb_index
+
+   Copyright (C) 2023 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 DWARF2_READ_GDB_INDEX_H
+#define DWARF2_READ_GDB_INDEX_H
+
+#include "gdbsupport/function-view.h"
+
+struct dwarf2_per_bfd;
+struct dwarf2_per_objfile;
+struct dwz_file;
+struct objfile;
+
+/* Callback types for dwarf2_read_gdb_index.  */
+
+typedef gdb::function_view
+    <gdb::array_view<const gdb_byte>(objfile *, dwarf2_per_bfd *)>
+    get_gdb_index_contents_ftype;
+typedef gdb::function_view
+    <gdb::array_view<const gdb_byte>(objfile *, dwz_file *)>
+    get_gdb_index_contents_dwz_ftype;
+
+/* Read .gdb_index.  If everything went ok, initialize the "quick"
+   elements of all the CUs and return 1.  Otherwise, return 0.  */
+
+int dwarf2_read_gdb_index
+  (dwarf2_per_objfile *per_objfile,
+   get_gdb_index_contents_ftype get_gdb_index_contents,
+   get_gdb_index_contents_dwz_ftype get_gdb_index_contents_dwz);
+
+#endif /* DWARF2_READ_GDB_INDEX_H */