mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
/*
|
|
This file is part of cpp-ethereum.
|
|
|
|
cpp-ethereum 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.
|
|
|
|
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/** @file PathGasMeter.cpp
|
|
* @author Christian <c@ethdev.com>
|
|
* @date 2015
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <set>
|
|
#include <vector>
|
|
#include <memory>
|
|
#include <libevmasm/GasMeter.h>
|
|
|
|
namespace dev
|
|
{
|
|
namespace eth
|
|
{
|
|
|
|
class KnownState;
|
|
|
|
struct GasPath
|
|
{
|
|
size_t index = 0;
|
|
std::shared_ptr<KnownState> state;
|
|
u256 largestMemoryAccess;
|
|
GasMeter::GasConsumption gas;
|
|
std::set<size_t> visitedJumpdests;
|
|
};
|
|
|
|
/**
|
|
* Computes an upper bound on the gas usage of a computation starting at a certain position in
|
|
* a list of AssemblyItems in a given state until the computation stops.
|
|
* Can be used to estimate the gas usage of functions on any given input.
|
|
*/
|
|
class PathGasMeter
|
|
{
|
|
public:
|
|
PathGasMeter(AssemblyItems const& _items);
|
|
|
|
GasMeter::GasConsumption estimateMax(size_t _startIndex, std::shared_ptr<KnownState> const& _state);
|
|
|
|
private:
|
|
GasMeter::GasConsumption handleQueueItem();
|
|
|
|
std::vector<std::unique_ptr<GasPath>> m_queue;
|
|
std::map<u256, size_t> m_tagPositions;
|
|
AssemblyItems const& m_items;
|
|
};
|
|
|
|
}
|
|
}
|