mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
92 lines
3.0 KiB
C++
92 lines
3.0 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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/**
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* @author Christian <c@ethdev.com>
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* @date 2015
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* Gas consumption estimator working alongside the AST.
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*/
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#pragma once
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#include <liblangutil/EVMVersion.h>
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#include <libevmasm/Assembly.h>
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#include <libevmasm/GasMeter.h>
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#include <array>
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#include <map>
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#include <vector>
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namespace dev
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{
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namespace solidity
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{
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class ASTNode;
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class FunctionDefinition;
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struct GasEstimator
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{
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public:
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using GasConsumption = eth::GasMeter::GasConsumption;
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using ASTGasConsumption = std::map<ASTNode const*, GasConsumption>;
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using ASTGasConsumptionSelfAccumulated =
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std::map<ASTNode const*, std::array<GasConsumption, 2>>;
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explicit GasEstimator(langutil::EVMVersion _evmVersion): m_evmVersion(_evmVersion) {}
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/// Estimates the gas consumption for every assembly item in the given assembly and stores
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/// it by source location.
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/// @returns a mapping from each AST node to a pair of its particular and syntactically accumulated gas costs.
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ASTGasConsumptionSelfAccumulated structuralEstimation(
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eth::AssemblyItems const& _items,
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std::vector<ASTNode const*> const& _ast
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) const;
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/// @returns a mapping from nodes with non-overlapping source locations to gas consumptions such that
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/// the following source locations are part of the mapping:
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/// 1. source locations of statements that do not contain other statements
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/// 2. maximal source locations that do not overlap locations coming from the first rule
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static ASTGasConsumption breakToStatementLevel(
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ASTGasConsumptionSelfAccumulated const& _gasCosts,
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std::vector<ASTNode const*> const& _roots
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);
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/// @returns the estimated gas consumption by the (public or external) function with the
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/// given signature. If no signature is given, estimates the maximum gas usage.
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GasConsumption functionalEstimation(
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eth::AssemblyItems const& _items,
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std::string const& _signature = ""
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) const;
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/// @returns the estimated gas consumption by the given function which starts at the given
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/// offset into the list of assembly items.
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/// @note this does not work correctly for recursive functions.
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GasConsumption functionalEstimation(
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eth::AssemblyItems const& _items,
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size_t const& _offset,
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FunctionDefinition const& _function
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) const;
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private:
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/// @returns the set of AST nodes which are the finest nodes at their location.
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static std::set<ASTNode const*> finestNodesAtLocation(std::vector<ASTNode const*> const& _roots);
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langutil::EVMVersion m_evmVersion;
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};
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}
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}
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