mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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/*
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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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* EVM versioning.
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*/
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#pragma once
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#include <string>
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#include <boost/optional.hpp>
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namespace dev
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{
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namespace solidity
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{
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/**
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* A version specifier of the EVM we want to compile to.
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* Defaults to the latest version.
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*/
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class EVMVersion
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{
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public:
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EVMVersion() {}
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static EVMVersion homestead() { return {Version::Homestead}; }
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static EVMVersion byzantium() { return {Version::Byzantium}; }
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static boost::optional<EVMVersion> fromString(std::string const& _version)
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{
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if (_version == "homestead")
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return homestead();
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else if (_version == "byzantium")
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return byzantium();
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else
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return {};
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}
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bool operator==(EVMVersion const& _other) const { return m_version == _other.m_version; }
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bool operator!=(EVMVersion const& _other) const { return !this->operator==(_other); }
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std::string name() const { return m_version == Version::Byzantium ? "byzantium" : "homestead"; }
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/// Has the RETURNDATACOPY and RETURNDATASIZE opcodes.
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bool supportsReturndata() const { return *this >= byzantium(); }
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bool hasStaticCall() const { return *this >= byzantium(); }
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/// Whether we have to retain the costs for the call opcode itself (false),
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/// or whether we can just forward easily all remaining gas (true).
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bool canOverchargeGasForCall() const
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{
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// @TODO when exactly was this introduced? Was together with the call stack fix.
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return m_version == Version::Byzantium;
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}
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private:
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enum class Version { Homestead, Byzantium };
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EVMVersion(Version _version): m_version(_version) {}
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Version m_version = Version::Byzantium;
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};
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}
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}
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