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68 lines
1.7 KiB
68 lines
1.7 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 GasMeter.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 <ostream>
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#include <libevmasm/AssemblyItem.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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/**
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* Class that helps computing the maximum gas consumption for instructions.
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*/
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class GasMeter
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{
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public:
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struct GasConsumption
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{
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GasConsumption(u256 _value = 0, bool _infinite = false): value(_value), isInfinite(_infinite) {}
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static GasConsumption infinite() { return GasConsumption(0, true); }
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GasConsumption& operator+=(GasConsumption const& _otherS);
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std::ostream& operator<<(std::ostream& _str) const;
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u256 value;
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bool isInfinite;
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};
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/// Returns an upper bound on the gas consumed by the given instruction.
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GasConsumption estimateMax(AssemblyItem const& _item);
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private:
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static GasConsumption runGas(Instruction _instruction);
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};
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inline std::ostream& operator<<(std::ostream& _str, GasMeter::GasConsumption const& _consumption)
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{
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if (_consumption.isInfinite)
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return _str << "inf";
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else
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return _str << _consumption.value;
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}
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}
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}
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