symbolic_execution.h

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// MIT License
//
// Copyright (c) 2019 Ruhr University Bochum, Chair for Embedded Security. All Rights reserved.
// Copyright (c) 2019 Marc Fyrbiak, Sebastian Wallat, Max Hoffmann ("ORIGINAL AUTHORS"). All rights reserved.
// Copyright (c) 2021 Max Planck Institute for Security and Privacy. All Rights reserved.
// Copyright (c) 2021 Jörn Langheinrich, Julian Speith, Nils Albartus, René Walendy, Simon Klix ("ORIGINAL AUTHORS"). All Rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
 
#pragma once
 
#include "hal_core/netlist/boolean_function.h"
#include "hal_core/netlist/boolean_function/symbolic_state.h"
#include "hal_core/netlist/boolean_function/types.h"
 
#include <optional>
 
namespace hal
{
    namespace SMT
    {
 
        class SymbolicExecution final
        {
        public:
            // Members
 
            SymbolicState state;
 
            // Constructors, Destructors, Operators
 
            explicit SymbolicExecution(const std::vector<BooleanFunction>& variables = {});
 
            // Interface
 
            Result<BooleanFunction> evaluate(const BooleanFunction& function) const;
 
          private:
            std::optional<std::vector<BooleanFunction::Value>> evaluate_constant(const BooleanFunction& function) const;
 
          public:
 
            Result<std::monostate> evaluate(const Constraint& constraint);
 
        private:
            // Internal Interface
 
            static std::vector<BooleanFunction> normalize(std::vector<BooleanFunction>&& p);
 
            Result<BooleanFunction> simplify(const BooleanFunction::Node& node, std::vector<BooleanFunction>&& p) const;
 
            static Result<BooleanFunction> constant_propagation(const BooleanFunction::Node& node, std::vector<BooleanFunction>&& p);
        };
 
    }    // namespace SMT
}    // namespace hal