path: root/libsolidity/analysis/ConstantEvaluator.h

/*
    This file is part of solidity.

    solidity 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 of the License, or
    (at your option) any later version.

    solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @author Christian <c@ethdev.com>
 * @date 2015
 * Evaluator for types of constant expressions.
 */

#pragma once

#include <libsolidity/ast/ASTVisitor.h>

namespace dev
{
namespace solidity
{

class ErrorReporter;
class TypeChecker;

/**
 * Small drop-in replacement for TypeChecker to evaluate simple expressions of integer constants.
 */
class ConstantEvaluator: private ASTConstVisitor
{
public:
    ConstantEvaluator(Expression const& _expr, ErrorReporter& _errorReporter, size_t _newDepth = 0):
        m_errorReporter(_errorReporter),
        m_depth(_newDepth)
    {
        _expr.accept(*this);
    }

private:
    virtual void endVisit(BinaryOperation const& _operation);
    virtual void endVisit(UnaryOperation const& _operation);
    virtual void endVisit(Literal const& _literal);
    virtual void endVisit(Identifier const& _identifier);

    ErrorReporter& m_errorReporter;
    /// Current recursion depth.
    size_t m_depth;
};

}
}