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diff --git a/gdb/source-cache.h b/gdb/source-cache.h
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+/* Cache of styled source file text
+   Copyright (C) 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 SOURCE_CACHE_H
+#define SOURCE_CACHE_H
+
+/* This caches highlighted source text, keyed by the source file's
+   full name.  A size-limited LRU cache is used.
+
+   Highlighting depends on the GNU Source Highlight library.  When not
+   available, this cache will fall back on reading plain text from the
+   appropriate file.  */
+class source_cache
+{
+public:
+
+  source_cache ()
+  {
+  }
+
+  /* Get the source text for the source file in symtab S.  FIRST_LINE
+     and LAST_LINE are the first and last lines to return; line
+     numbers are 1-based.  If the file cannot be read, false is
+     returned.  Otherwise, LINES is set to the desired text.  The
+     returned text may include ANSI terminal escapes.  */
+  bool get_source_lines (struct symtab *s, int first_line,
+			 int last_line, std::string *lines);
+
+  /* Remove all the items from the source cache.  */
+  void clear ()
+  {
+    m_source_map.clear ();
+  }
+
+private:
+
+  /* One element in the cache.  */
+  struct source_text
+  {
+    /* The full name of the file.  */
+    std::string fullname;
+    /* The contents of the file.  */
+    std::string contents;
+  };
+
+  /* A helper function for get_source_lines that is used when the
+     source lines are not highlighted.  The arguments and return value
+     are as for get_source_lines.  */
+  bool get_plain_source_lines (struct symtab *s, int first_line,
+			       int last_line, std::string *lines);
+  /* A helper function for get_plain_source_lines that extracts the
+     desired source lines from TEXT, putting them into LINES.  The
+     arguments and return value are as for get_source_lines.  */
+  bool extract_lines (const struct source_text &text, int first_line,
+		      int last_line, std::string *lines);
+
+  /* The contents of the cache.  */
+  std::vector<source_text> m_source_map;
+};
+
+/* The global source cache.  */
+extern source_cache g_source_cache;
+
+#endif /* SOURCE_CACHE_H */