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diff --git a/gcc/analyzer/call-string.h b/gcc/analyzer/call-string.h
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+/* Call stacks at program points.
+   Copyright (C) 2019-2020 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_ANALYZER_CALL_STRING_H
+#define GCC_ANALYZER_CALL_STRING_H
+
+class supergraph;
+class call_superedge;
+class return_superedge;
+
+/* A string of return_superedge pointers, representing a call stack
+   at a program point.
+
+   This is used to ensure that we generate interprocedurally valid paths
+   i.e. that we return to the same callsite that called us.
+
+   The class actually stores the return edges, rather than the call edges,
+   since that's what we need to compare against.  */
+
+class call_string
+{
+public:
+  call_string () : m_return_edges () {}
+  call_string (const call_string &other);
+  call_string& operator= (const call_string &other);
+
+  bool operator== (const call_string &other) const;
+
+  void print (pretty_printer *pp) const;
+
+  hashval_t hash () const;
+
+  bool empty_p () const { return m_return_edges.is_empty (); }
+
+  void push_call (const supergraph &sg,
+		  const call_superedge *sedge);
+  const return_superedge *pop () { return m_return_edges.pop (); }
+
+  int calc_recursion_depth () const;
+
+  static int cmp (const call_string &a,
+		  const call_string &b);
+
+  unsigned length () const { return m_return_edges.length (); }
+  const return_superedge *operator[] (unsigned idx) const
+  {
+    return m_return_edges[idx];
+  }
+
+  void validate () const;
+
+private:
+  static int cmp_1 (const call_string &a,
+		    const call_string &b);
+
+  auto_vec<const return_superedge *> m_return_edges;
+};
+
+#endif /* GCC_ANALYZER_CALL_STRING_H */