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diff --git a/gcc/diagnostics/source-printing-effects.h b/gcc/diagnostics/source-printing-effects.h
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+++ b/gcc/diagnostics/source-printing-effects.h
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+/* Classes for adding special effects when quoting source code.
+   Copyright (C) 2024-2025 Free Software Foundation, Inc.
+   Contributed by David Malcolm <dmalcolm@redhat.com>.
+
+This file is part of GCC.
+
+GCC 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, or (at your option)
+any later version.
+
+GCC 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 GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_DIAGNOSTICS_SOURCE_PRINTING_EFFECTS_H
+#define GCC_DIAGNOSTICS_SOURCE_PRINTING_EFFECTS_H
+
+namespace diagnostics {
+
+/* Abstract base class for describing special effects when printing
+   a label when quoting source code.  */
+
+class label_effects
+{
+public:
+  virtual ~label_effects () {}
+
+  /* Adding links between labels, e.g. for visualizing control flow
+     in execution paths.  */
+  virtual bool has_in_edge (unsigned range_idx) const = 0;
+  virtual bool has_out_edge (unsigned range_idx) const = 0;
+};
+
+/* A class to hold state when quoting a run of lines of source code.  */
+
+class source_effect_info
+{
+public:
+  source_effect_info ()
+  : m_leading_in_edge_column (-1),
+    m_trailing_out_edge_column (-1)
+  {
+  }
+
+  /* The column for an incoming link to the first label,
+     or -1 if no such link.  */
+  int m_leading_in_edge_column;
+
+  /* The column for an outgoing link from the final label,
+     or -1 if no such link.  */
+  int m_trailing_out_edge_column;
+};
+
+} // namespace diagnostics
+
+#endif /* GCC_DIAGNOSTICS_SOURCE_PRINTING_EFFECTS_H */