solidity/libsolidity/formal/SymbolicState.h
2020-05-20 12:55:18 +02:00

73 lines
1.8 KiB
C++

/*
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/>.
*/
#pragma once
#include <libsolidity/formal/SymbolicVariables.h>
#include <libsmtutil/Sorts.h>
#include <libsmtutil/SolverInterface.h>
namespace solidity::frontend::smt
{
class EncodingContext;
/**
* Symbolic representation of the blockchain state.
*/
class SymbolicState
{
public:
SymbolicState(EncodingContext& _context);
void reset();
/// Blockchain.
//@{
/// Value of `this` address.
smtutil::Expression thisAddress();
/// @returns the symbolic balance of address `this`.
smtutil::Expression balance();
/// @returns the symbolic balance of an address.
smtutil::Expression balance(smtutil::Expression _address);
/// Transfer _value from _from to _to.
void transfer(smtutil::Expression _from, smtutil::Expression _to, smtutil::Expression _value);
//@}
private:
/// Adds _value to _account's balance.
void addBalance(smtutil::Expression _account, smtutil::Expression _value);
EncodingContext& m_context;
/// Symbolic `this` address.
SymbolicAddressVariable m_thisAddress{
"this",
m_context
};
/// Symbolic balances.
SymbolicArrayVariable m_balances{
std::make_shared<smtutil::ArraySort>(smtutil::SortProvider::intSort, smtutil::SortProvider::intSort),
"balances",
m_context
};
};
}