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diff --git a/gcc/xml.h b/gcc/xml.h
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+/* Classes for representing XML trees.
+   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_XML_H
+#define GCC_XML_H
+
+namespace xml {
+
+// Forward decls; indentation reflects inheritance
+struct node;
+  struct text;
+  struct node_with_children;
+    struct document;
+    struct element;
+
+struct node
+{
+  virtual ~node () {}
+  virtual void write_as_xml (pretty_printer *pp,
+			     int depth, bool indent) const = 0;
+  virtual text *dyn_cast_text ()
+  {
+    return 0;
+  }
+  void dump (FILE *out) const;
+  void DEBUG_FUNCTION dump () const { dump (stderr); }
+};
+
+struct text : public node
+{
+  text (std::string str)
+  : m_str (std::move (str))
+  {}
+
+  void write_as_xml (pretty_printer *pp,
+		     int depth, bool indent) const final override;
+
+  text *dyn_cast_text () final override
+  {
+    return this;
+  }
+
+  std::string m_str;
+};
+
+struct node_with_children : public node
+{
+  void add_child (std::unique_ptr<node> node);
+  void add_text (std::string str);
+
+  std::vector<std::unique_ptr<node>> m_children;
+};
+
+struct document : public node_with_children
+{
+  void write_as_xml (pretty_printer *pp,
+		     int depth, bool indent) const final override;
+};
+
+struct element : public node_with_children
+{
+  element (std::string kind, bool preserve_whitespace)
+    : m_kind (std::move (kind)),
+    m_preserve_whitespace (preserve_whitespace)
+  {}
+
+  void write_as_xml (pretty_printer *pp,
+		     int depth, bool indent) const final override;
+
+  void set_attr (const char *name, std::string value);
+
+  std::string m_kind;
+  bool m_preserve_whitespace;
+  std::map<std::string, std::string> m_attributes;
+  std::vector<std::string> m_key_insertion_order;
+};
+
+/* A fragment of raw XML source, to be spliced in directly.
+   Use sparingly.  */
+
+struct raw : public node
+{
+  raw (std::string xml_src)
+  : m_xml_src (xml_src)
+  {
+  }
+
+  void write_as_xml (pretty_printer *pp,
+		     int depth, bool indent) const final override;
+
+  std::string m_xml_src;
+};
+
+} // namespace xml
+
+#endif /* GCC_XML_H.  */