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author | Christian Parpart <christian@ethereum.org> | 2018-11-14 21:59:30 +0800 |
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committer | Alex Beregszaszi <alex@rtfs.hu> | 2018-11-22 02:58:12 +0800 |
commit | 87821c53c3a73d3e35a0e50a7c159d9aa5d6b253 (patch) | |
tree | d0335db1bfe77f91168e14599e943105b7c9a2c3 /liblangutil/EVMVersion.h | |
parent | d47707abaddfd6820d8ff1f9ec5ec0d2a61ee622 (diff) | |
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Isolating files shared between Yul- and Solidity language frontend.
Diffstat (limited to 'liblangutil/EVMVersion.h')
-rw-r--r-- | liblangutil/EVMVersion.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/liblangutil/EVMVersion.h b/liblangutil/EVMVersion.h new file mode 100644 index 00000000..657727ac --- /dev/null +++ b/liblangutil/EVMVersion.h @@ -0,0 +1,94 @@ +/* + 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/>. +*/ +/** + * EVM versioning. + */ + +#pragma once + +#include <string> + +#include <boost/optional.hpp> +#include <boost/operators.hpp> + +namespace dev +{ +namespace solidity +{ + +/** + * A version specifier of the EVM we want to compile to. + * Defaults to the latest version. + */ +class EVMVersion: + boost::less_than_comparable<EVMVersion>, + boost::equality_comparable<EVMVersion> +{ +public: + EVMVersion() {} + + static EVMVersion homestead() { return {Version::Homestead}; } + static EVMVersion tangerineWhistle() { return {Version::TangerineWhistle}; } + static EVMVersion spuriousDragon() { return {Version::SpuriousDragon}; } + static EVMVersion byzantium() { return {Version::Byzantium}; } + static EVMVersion constantinople() { return {Version::Constantinople}; } + + static boost::optional<EVMVersion> fromString(std::string const& _version) + { + for (auto const& v: {homestead(), tangerineWhistle(), spuriousDragon(), byzantium(), constantinople()}) + if (_version == v.name()) + return v; + return {}; + } + + bool operator==(EVMVersion const& _other) const { return m_version == _other.m_version; } + bool operator<(EVMVersion const& _other) const { return m_version < _other.m_version; } + + std::string name() const + { + switch (m_version) + { + case Version::Homestead: return "homestead"; + case Version::TangerineWhistle: return "tangerineWhistle"; + case Version::SpuriousDragon: return "spuriousDragon"; + case Version::Byzantium: return "byzantium"; + case Version::Constantinople: return "constantinople"; + } + return "INVALID"; + } + + /// Has the RETURNDATACOPY and RETURNDATASIZE opcodes. + bool supportsReturndata() const { return *this >= byzantium(); } + bool hasStaticCall() const { return *this >= byzantium(); } + bool hasBitwiseShifting() const { return *this >= constantinople(); } + bool hasCreate2() const { return *this >= constantinople(); } + + /// Whether we have to retain the costs for the call opcode itself (false), + /// or whether we can just forward easily all remaining gas (true). + bool canOverchargeGasForCall() const { return *this >= tangerineWhistle(); } + +private: + enum class Version { Homestead, TangerineWhistle, SpuriousDragon, Byzantium, Constantinople }; + + EVMVersion(Version _version): m_version(_version) {} + + Version m_version = Version::Byzantium; +}; + + +} +} |