Spacer engine for HORN logic

The algorithms implemented in the engine are described in the following papers

Anvesh Komuravelli, Nikolaj Bjørner, Arie Gurfinkel, Kenneth L. McMillan:
Compositional Verification of Procedural Programs using Horn Clauses over Integers and Arrays. FMCAD 2015: 89-96

Nikolaj Bjørner, Arie Gurfinkel:
Property Directed Polyhedral Abstraction. VMCAI 2015: 263-281

Anvesh Komuravelli, Arie Gurfinkel, Sagar Chaki:
SMT-Based Model Checking for Recursive Programs. CAV 2014: 17-34

src/muz/spacer/spacer_marshal.h

@@ -0,0 +1,29 @@
+/*++
+Copyright (c) 2017 Arie Gurfinkel
+Module Name:
+
+   spacer_marshal.h
+
+Abstract:
+
+   marshaling and unmarshaling of expressions
+
+   --*/
+#ifndef _SPACER_MARSHAL_H_
+#define _SPACER_MARSHAL_H_
+
+#include <string>
+#include "ast.h"
+#include <iostream>
+
+namespace spacer {
+std::ostream &marshal(std::ostream &os, expr_ref e, ast_manager &m);
+std::string marshal(expr_ref e, ast_manager &m);
+expr_ref unmarshal(std::string s, ast_manager &m);
+expr_ref unmarshal(std::istream &is, ast_manager &m);
+
+
+}
+
+
+#endif