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67 lines
1.6 KiB
67 lines
1.6 KiB
10 years ago
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/*
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This file is part of cpp-ethereum.
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cpp-ethereum 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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cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file PathGasMeter.cpp
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* @author Christian <c@ethdev.com>
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* @date 2015
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*/
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#pragma once
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#include <set>
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#include <vector>
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#include <memory>
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#include <libevmasm/GasMeter.h>
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namespace dev
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{
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namespace eth
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{
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class KnownState;
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struct GasPath
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{
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size_t index = 0;
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std::shared_ptr<KnownState> state;
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u256 largestMemoryAccess;
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GasMeter::GasConsumption gas;
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std::set<size_t> visitedJumpdests;
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};
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/**
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* Computes an upper bound on the gas usage of a computation starting at a certain position in
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* a list of AssemblyItems in a given state until the computation stops.
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* Can be used to estimate the gas usage of functions on any given input.
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*/
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class PathGasMeter
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{
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public:
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PathGasMeter(AssemblyItems const& _items);
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GasMeter::GasConsumption estimateMax(size_t _startIndex, std::shared_ptr<KnownState> const& _state);
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private:
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GasMeter::GasConsumption handleQueueItem();
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std::vector<std::unique_ptr<GasPath>> m_queue;
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std::map<u256, size_t> m_tagPositions;
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AssemblyItems const& m_items;
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};
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}
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}
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