mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
104 lines
2.8 KiB
C++
104 lines
2.8 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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// SPDX-License-Identifier: GPL-3.0
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#pragma once
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#include <libsolidity/formal/SymbolicVariables.h>
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#include <libsmtutil/Sorts.h>
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#include <libsmtutil/SolverInterface.h>
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namespace solidity::frontend::smt
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{
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class EncodingContext;
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class SymbolicAddressVariable;
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class SymbolicArrayVariable;
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/**
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* Symbolic representation of the blockchain context:
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* - error flag
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* - this (the address of the currently executing contract)
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* - state, represented as a tuple of:
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* - balances
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* - TODO: potentially storage of contracts
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* - TODO transaction variables
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*/
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class SymbolicState
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{
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public:
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SymbolicState(EncodingContext& _context);
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void reset();
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/// Blockchain.
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//@{
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SymbolicIntVariable& errorFlag();
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smtutil::SortPointer errorFlagSort();
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/// @returns the symbolic value of the currently executing contract's address.
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smtutil::Expression thisAddress();
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smtutil::Expression thisAddress(unsigned _idx);
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smtutil::SortPointer thisAddressSort();
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/// @returns the state as a tuple.
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smtutil::Expression state();
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smtutil::Expression state(unsigned _idx);
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smtutil::SortPointer stateSort();
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void newState();
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/// @returns the symbolic balances.
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smtutil::Expression balances();
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/// @returns the symbolic balance of address `this`.
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smtutil::Expression balance();
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/// @returns the symbolic balance of an address.
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smtutil::Expression balance(smtutil::Expression _address);
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/// Transfer _value from _from to _to.
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void transfer(smtutil::Expression _from, smtutil::Expression _to, smtutil::Expression _value);
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//@}
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private:
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/// Adds _value to _account's balance.
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void addBalance(smtutil::Expression _account, smtutil::Expression _value);
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/// Generates a new tuple where _member is assigned _value.
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smtutil::Expression assignStateMember(std::string const& _member, smtutil::Expression const& _value);
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EncodingContext& m_context;
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SymbolicIntVariable m_error{
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TypeProvider::uint256(),
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TypeProvider::uint256(),
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"error",
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m_context
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};
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SymbolicAddressVariable m_thisAddress{
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"this",
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m_context
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};
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std::map<std::string, unsigned> m_componentIndices;
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/// balances, TODO storage of other contracts
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std::map<std::string, smtutil::SortPointer> m_stateMembers;
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std::unique_ptr<SymbolicTupleVariable> m_stateTuple;
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};
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}
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