mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
137 lines
3.8 KiB
C++
137 lines
3.8 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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// SPDX-License-Identifier: GPL-3.0
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/** @file Common.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*
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* Very common stuff (i.e. that every other header needs except vector_ref.h).
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*/
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#pragma once
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// way too many unsigned to size_t warnings in 32 bit build
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#ifdef _M_IX86
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#pragma warning(disable:4244)
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#endif
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#if _MSC_VER && _MSC_VER < 1900
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#define _ALLOW_KEYWORD_MACROS
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#define noexcept throw()
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#endif
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#ifdef __INTEL_COMPILER
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#pragma warning(disable:3682) //call through incomplete class
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#endif
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#include <libsolutil/vector_ref.h>
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#include <boost/version.hpp>
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#if (BOOST_VERSION < 106500)
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#error "Unsupported Boost version. At least 1.65 required."
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#endif
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#include <boost/multiprecision/cpp_int.hpp>
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#include <map>
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#include <utility>
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#include <vector>
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#include <functional>
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#include <string>
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namespace solidity
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{
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// Binary data types.
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using bytes = std::vector<uint8_t>;
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using bytesRef = util::vector_ref<uint8_t>;
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using bytesConstRef = util::vector_ref<uint8_t const>;
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// Numeric types.
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using bigint = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<>>;
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using u256 = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<256, 256, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
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using s256 = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<256, 256, boost::multiprecision::signed_magnitude, boost::multiprecision::unchecked, void>>;
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using u160 = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<160, 160, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
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// Map types.
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using StringMap = std::map<std::string, std::string>;
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// String types.
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using strings = std::vector<std::string>;
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/// Interprets @a _u as a two's complement signed number and returns the resulting s256.
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inline s256 u2s(u256 _u)
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{
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static bigint const c_end = bigint(1) << 256;
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if (boost::multiprecision::bit_test(_u, 255))
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return s256(-(c_end - _u));
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else
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return s256(_u);
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}
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/// @returns the two's complement signed representation of the signed number _u.
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inline u256 s2u(s256 _u)
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{
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static bigint const c_end = bigint(1) << 256;
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if (_u >= 0)
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return u256(_u);
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else
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return u256(c_end + _u);
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}
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inline u256 exp256(u256 _base, u256 _exponent)
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{
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using boost::multiprecision::limb_type;
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u256 result = 1;
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while (_exponent)
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{
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if (boost::multiprecision::bit_test(_exponent, 0))
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result *= _base;
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_base *= _base;
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_exponent >>= 1;
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}
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return result;
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}
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/// Checks whether _mantissa * (X ** _exp) fits into 4096 bits,
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/// where X is given indirectly via _log2OfBase = log2(X).
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bool fitsPrecisionBaseX(bigint const& _mantissa, double _log2OfBase, uint32_t _exp);
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inline std::ostream& operator<<(std::ostream& os, bytes const& _bytes)
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{
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std::ostringstream ss;
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ss << std::hex;
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std::copy(_bytes.begin(), _bytes.end(), std::ostream_iterator<int>(ss, ","));
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std::string result = ss.str();
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result.pop_back();
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os << "[" + result + "]";
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return os;
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}
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/// RAII utility class whose destructor calls a given function.
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class ScopeGuard
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{
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public:
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explicit ScopeGuard(std::function<void(void)> _f): m_f(std::move(_f)) {}
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~ScopeGuard() { m_f(); }
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private:
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std::function<void(void)> m_f;
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};
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}
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