blob: 2527d7fb93f34b9679377f871c0c988578af4516 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
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/>.
*/
/** @file PathGasMeter.cpp
* @author Christian <c@ethdev.com>
* @date 2015
*/
#pragma once
#include <libevmasm/GasMeter.h>
#include <libsolidity/interface/EVMVersion.h>
#include <set>
#include <vector>
#include <memory>
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:
explicit PathGasMeter(AssemblyItems const& _items, solidity::EVMVersion _evmVersion);
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;
solidity::EVMVersion m_evmVersion;
};
}
}
|
