Add name splitting

The new DWARF index code works by keeping names pre-split.  That is,
rather than storing a symbol name like "a::b::c", the names "a", "b",
and "c" will be stored separately.

This patch introduces some helper code to split a full name into its
components.

1 files changed, 45 insertions, 0 deletions

diff --git a/gdb/split-name.h b/gdb/split-name.h
new file mode 100644
index 0000000..c588b84
--- /dev/null
+++ b/gdb/split-name.h
@@ -0,0 +1,45 @@
+/* Split a symbol name.
+
+   Copyright (C) 2022 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 GDB_SPLIT_NAME_H
+#define GDB_SPLIT_NAME_H
+
+#include "gdbsupport/gdb_string_view.h"
+
+/* The available styles of name splitting.  */
+
+enum class split_style
+{
+  /* No splitting - C style.  */
+  NONE,
+  /* C++ style, with "::" and template parameter intelligence.  */
+  CXX,
+  /* Split at ".".  Used by Ada, Go, D.  */
+  DOT,
+  /* Split at "__".  Used by Ada encoded names.  */
+  UNDERSCORE,
+};
+
+/* Split NAME into components at module boundaries.  STYLE indicates
+   which style of splitting to use.  */
+
+extern std::vector<gdb::string_view> split_name (const char *name,
+						 split_style style);
+
+#endif /* GDB_SPLIT_NAME_H */